2005 Honda Accord Hybrid Sedan -...

2005 Honda Accord Hybrid Sedan Overview

Introduction Since the Accord’s launch as a compact hatchback car in 1976, it has earned widespread acclaim

as a leader in smart design, superb quality and world-class efficiency. In its 28-year history, the

Accord has constantly re-invented itself, going from that original compact hatchback to today’s

premium intermediate sedan and coupe. The seventh-generation Accord V-6, released in 2003,

once again raised the bar for performance, safety and value in the intermediate segment with a

highly efficient and powerful 3.0-litre, 240-horsepower, SOHC VTEC V-6 engine, 4-wheel disc

brakes and a standard anti-lock braking system (ABS) on all models, along with standard

features such as air conditioning, an AM/FM/CD stereo system, power windows and door locks.

In 2005, the Accord further establishes its role as a technology, performance and efficiency

leader with the introduction of the Accord Hybrid, the world’s first V-6-powered gasoline-

electric-hybrid vehicle. Boasting the highest fuel efficiency for a V-6-powered automobile,

Accord Hybrid utilizes the third-generation of Honda’s exclusive Integrated Motor Assist (IMA)

hybrid system featuring new Variable Cylinder Management (VCM) technology. By combining

a high-output V-6 engine and IMA with VCM, the Accord Hybrid Sedan provides even more

power – 255 hp versus 240hp in the regular Accord V-6 Sedan – while improving fuel efficiency

to an estimated 7.9 L/100km city / 5.9 L/100km highway – better than virtually all 4-cylinder

intermediate sedans and similar to that of the Honda Civic Sedan, already a benchmark for fuel

efficiency in the compact car class.

2005 Accord Hybrid Sedan - 1 - OVERVIEW

The Honda Accord Hybrid Sedan is designed to show that a hybrid powertrain can be an

important component in the mainstream of the automotive landscape that provides exceptional

fuel economy while still improving power, performance and comfort.

With the introduction of the 2000 Insight – North America’s first hybrid-powered car and still

the leader of annual fuel economy ratings – Honda has been at the forefront of hybrid

technology. The company followed up the Insight with a hybrid version of Canada’s best-selling

compact car, the Civic Hybrid, introduced in 2002 as the first truly mainstream hybrid and the

first application of hybrid technology to an existing, high-volume vehicle. With the addition of

the Accord Hybrid, Honda becomes the only car company in North America with three hybrid

models available to consumers.

While using a more powerful and efficient version of Honda’s IMA system, the Accord Hybrid

Sedan also incorporates new, leading-edge technologies that engineers are also applying to

Honda’s main line of cars and trucks.

Among these advanced technologies is its Variable Cylinder Management (VCM) system that

allows for deactivation of three of the engine’s six cylinders during cruising. The system also

features an Active Control Engine Mount (ACM) an Active Noise Control (ANC) system to

eliminate the potential effects of three-cylinder operation on cabin noise and engine vibration.

This same technology is also being applied on the all-new 2005 Odyssey minivan equipped with

the available i-VTEC engine. In addition, the Accord Hybrid utilizes a dual scroll hybrid air

conditioning compressor that is both belt (engine) and electric motor driven, allowing for more

efficient operation of the Accord Hybrid’s dual zone automatic climate control system, even

when the engine is in idle stop mode.

Combined, these technologies along with improvements in aerodynamics and weight saving

features like an aluminum hood, allow the Accord Hybrid to achieve an estimated fuel economy

rating of 7.9 L/100km in the city and 5.9 L/100km highway, up from 11.4 L/100km city / 7.3

L/100km highway for the Accord EX V-6 Sedan – a fuel economy gain of 31 percent and 21

percent, respectively. The Accord’s Integrated Motor Assist System (60%) accounts for over

half the gains in city fuel efficiency, while Variable Cylinder Management (15%) and idle stop


(25%) is responsible for the rest. During highway cruising, the VCM system (57%) provides the

majority of the increase, while IMA (38%) and a lower drag coefficient and greater

aerodynamics (5%) also contribute.

Accord Hybrid Highlights • 3rd-generation Honda Integrated Motor Assist (IMA) system

• 3.0L i-VTEC V-6 engine

• Intelligent Power Unit (IPU) – Power Control Unit (PCU), Nickel Metal-Hydride (NiMH)

battery pack, internal cooling system

• Idle Stop

• Variable Cylinder Management (VCM)

• Active Control Mount (ACM) engine mount system

• Dual Zone Hybrid Automatic Climate Control System

Unique Accord Hybrid Sedan Features Exterior: • Standard rear decklid spoiler • Aluminum hood • Unique front grille • Exclusive, lightweight 16” alloy wheels with larger 215/60 R16 tires • New combination AM/FM radio antenna Interior: • Exclusive IMA digital readout • Active Noise Control (ANC) • New, illuminated steering wheel-mounted switches Mechanical: • 3.0L i-VTEC V-6 engine • More powerful IMA system

255 hp @ 6000 rpm 232 lb.-ft. @ 5000 rpm

• Hybrid Idle Stop • Variable Cylinder Management™ (VCM™)


• Dual scroll hybrid air conditioning compressor

• Active Control Engine Mount (ACM) system • Modified 5-speed automatic transmission • Electric Power Steering (EPS) • Enhanced Traction Control System (TCS) with creep aid system

Un ike previous hybrid vehicles frol m Honda and other manufacturers, the focus for the Honda

performance. The use of

Honda’s new Variable Cylinder Management (VCM) system that deactivates the three of V-6

ngine’s cylinders to save fuel during cruising and deceleration allow Honda engineers to

d

).

rve,

Accord Hybrid is not entirely on high fuel efficiency, but also on high

e

maximize fuel economy while the hybrid IMA system helps to increase peak power by 15 hp an

20 lb.-ft. of torque over the current Accord EX V-6. The Accord Hybrid Sedan improves on the

current Accord V-6’s 0-100 km/h time by half a second (7.5 sec. vs. 8.0 for an Accord EX V-6

In addition, peak torque of 232 lb.-ft @ 5000 rpm is now spread out over a much flatter cu

which makes 90 percent available at engine speeds less than 4000 rpm.

Major Accord Hybrid Specifications Accord Hybrid

Sedan Accord EX

Sedan V-6 Change from EX

V-6 Engine displacement (cc) 2997 2997

Valve configuration SOHC i-VTEC V-6

SOHC VTEC V-6 i-VTEC

Battery capacity 144V, 6.0 Ah N/A

Horsepower @ RPM 255 00 240 hp @ 6250 hp @ 60 + 15 hp (6.3%)

232 lb.-ft. @ 5000 212 lb.-ft. @ 5000 + 20 lb.-ft (Torque @ RPM 9.4%)

Transmission New 5-speed AT 5-speed AT Lighter, more compact

Wheelbase (mm) 2740 (107.9”) 2740 (107.9”)

Length (mm) 4813 (189.5”) 4813 (189.5”)

Width (mm) 1814 (71.5”) 1814 (71.5”)

Height (mm) 1449 (57.1”) 1449 (57.1”)

Passenger volume (litres) 2908 (102.7 cu.ft.) 2767 (97.7 cu.ft.) + 142 litres


(+ 5 cu. ft.) (5.1%)

Carg es) 317 (11.2 cu.ft.) 396 (14.0 cu.ft.) - 79 litres

(- 2.8 u.ft) c(18.6%)

o volume (litr

Fuel Economy (L/100 city / highway)

7.9 / 5.9 (estimated) 11.4 / 7.3 + 4.1 city

+ 1.4 hwy

Driving range (based on 1019 km 826 km highway mileage) (633 miles) (513 miles)

+ 193 km (+ 120 miles)

(23%)

Accord Hybrid Powertrain

EWhen planning the current Accord Se s were look raditional A

qu ew packa h more emo al, and to

sedan styling similar to popular luxury European sport sedans. The 2005 Accord Hybrid Sedan

on design cues intended to help it achieve top-of-class fuel economy and to

s

that alone generates substantial fuel

cruising

ide exceptional fuel efficiency

iate class-leading power when the

highway fuel economy while

ntation of Honda’s advanced i-VTEC

stem in place of the VTEC system of the Accord EX V-6.

xterior Overview dan, engineer ing to put t ccord

ality and reliability into a n ge filled wit tional appe employ

adds to this foundati

improve the car’s aerodynamics and reduce its drag coefficient to a low 0.29. These addition

include a rear decklid spoiler and lightweight 16” aluminum alloy aerodynamic wheels.

Additionally, lightweight aluminum was used in the Accord Hybrid’s hood, bumper frames and

rear suspension knuckles, helping to reduce overall weight.

Powertrain In balancing the seemingly contradictory goals of high fuel

efficiency and high performance, Honda combined the 3rd

generation IMA system with the all-new Variable Cylinder

Management (VCM) system

savings when full engine power is not needed (as in highway

and deceleration). Working together, the two systems prov

benefits when the engine is not at full capacity, but intermed

car is at full throttle. Overall, the VCM system helps to maximize

the IMA system helps to maximize city fuel economy.

The engine used on the Honda Accord Hybrid Sedan is primarily the same as that of the Accord

V-6, but with a few modifications to save weight and to allow for the use of Honda’s VCM

system. Foremost among these changes is the impleme

sy


Without any help from the electric IMA system, this 3.0L

engine provides 240 hp and 217 lb.-ft of torque, but utilizes

some lighter weight materials than the original version used

Variable Cylinder Management and Integrated Motor Assist

the standard Accord EX V-6.

ow been engineered to

aximize fuel economy in the Accord’s 3.0L i-VTEC V-6 in

peed and thro

or minor a

ed when th

r braki

-axis belt drive with an auto ten

aximum efficiency and prevent power losses due to friction.

een th

asoline engine and automatic transmission – is the largest and most

s produced. The motor produces 10 percent more

in

First introduced to North America in the all-new 2005

Odyssey minivan, Honda’s innovative Variable Cylinder

Management (VCM) system has n

m

concert with the IMA system. It works by monitoring s

full engine power is required, if not – as in steady cruising

three cylinders is deactivated. Further efficiency is achiev

fuel to the three active cylinders when the car is decelerating o

employed in most Honda vehicles.

Additional efficiencies are gained by the use of lightweight magnesiu

and the Accord Hybrid Sedan’s engine incorporates a new engine hea

system. A new airflow sensor and a 2

if

m

IMA technology The 3rd generation of Honda’s Integrated Motor Assist system – whic

incorporates an ultra-thin electric motor (68mm) mounted betw

g

efficient Honda ha

horsepower assist (12 kW total) than the Civic Hybrid and 26 percen

more supplemental torque (100.4 lb.-ft. total). During regenerative

braking when the motor acts as a generator for the IMA’s battery pac

generator also produces 12% percent more kW of power (14 kW tota

both cases, the motor is more efficient, transferring 97.5 percent (vs.

Civic Hybrid) of the available energy in assist mode, and converting

2005 Accord Hybrid Sedan - 6 -

ttle action to determine

Intelligent Power Unit

IMA Layout

cceleration, the rear bank of

e ts

ng – a feature similarly

sioner help to maintain

e

, the

), and in

.6% in

95.2

m for certain engine parts,

d to manage the VCM

fuel injection system cu

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t

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l

94

OVERVIEW

percent (vs. 93.6%) of renewable kinetic energy into electrical energy in charge mode. In

addition, the Accord Hybrid’s Nickel Metal-Hydride battery pack and integrated cooling syste

are more compact, yet more efficient than that in a Civic Hybrid Sedan.

Transmission A specially modified version of the existing 5-speed automatic transmission was specified f

Accord H

m

or the

ybrid Sedan. This new transmission is more compact than that in an Accord EX V-6

edan and is specially designed to work with the IMA’s electric motor to maximize the motor’s

erate electricity during regenerative braking.

tios than the automatic transmission

an Accord EX V-6, acceleration is quick from the line and the taller 5th gear helps conserve

t

ybrid the fuel-efficient car that it is would go

or the small IMA display integrated into the car’s speedometer.

ne

S

ability to regen

The transmission uses a high response lockup clutch torque converter for improved fuel

efficiency while an integrated electric oil pump helps provide smooth and quick restarts of the

engine after idle stops. With a slightly wider range of gear ra

in

fuel during highway cruising.

IMA Operation Though drivers will notice a different experience when it comes to the reduced frequency of fuel

stops, the actual driving experience is virtually identical to that of a tradi ional Accord EX V-6.

The complex processes that make the Accord H

unnoticed if not f


At startup, the Accord Hybrid’s engine runs at idle speed until the driver increases the throttle to

begin accelerating. During acceleration, all six cylinders of the Accord Hybrid’s 3.0-litre engi

are active, with the IMA system helping if hard acceleration is required. If this is the case, the

blue indicator bars in the Accord’s IMA display will light to show that the IMA is in Assist

Mode.

When the driver minimizes accelerator input at cruising speed, a number of fuel saving

e

tim

al

tor

will of

e

’s

ng on a

0

hassis Overview

t of

t for the adoption of electric power steering (EPS) versus a

aditional hydraulic power rack and pinion steering set up in the Accord EX V-6.

e

operations begin. First, the Variable Cylinder Management (VCM) system can deactivate th

engine’s rear bank of three cylinders to effectively cut fuel consumption in half. At the same

e, the IMA’s Intelligent Power Unit turns the IMA motor into a generator to begin

regenerative braking and the IMA display’s green bars illuminate to show the level of electric

energy being created. If, during cruising, power is required to maintain speed, the IMA mo

fer assist while the rear cylinders remain inactive.

As the vehicle begins to slow and the driver applies the brakes, more electricity is created

through regenerative braking and the VCM system cuts fuel to the active front bank of three

cylinders to further conserve fuel.

As the driver continues to apply the brake, the IMA system can completely idle-stop the engin

when vehicle speed drops below 13 km/h (8 mph). An indicator in the instrument panel

tachometer flashes to alert the driver that the car is idle-stopped. When the driver releases the

brake pedal, the IMA motor instantaneously spins the engine back into action with all six

cylinders firing at idle speed. Occasionally, the idle stop feature is disabled when drivi

hot day and full air-conditioning power is needed by the hybrid air conditioning system. At all

other times, idle stop can be activated once the vehicle speed exceeds approximately 16 km/h (1

mph).

C The suspension and steering set up for the Accord Hybrid Sedan is essentially the same as tha

the existing Accord EX V-6, excep

tr

The 7th-generation Accord’s 4-wheel double wishbone suspension continues to be one of the

most sophisticated arrangements in the intermediate sedan class. The front double wishbon


OVERVIEW

Accord Hybrid Interior with Available Honda Navigation System

e

o

he hydraulic system). While similar to the performance-oriented steering systems used in

e Honda S2000 and the Acura NSX, the high-mounted EPS system in the Accord Hybrid is

complete steering operation during idle stop mode.

rake

orporating hybrid technology seamlessly into its mainstream

ehicles, there are few interior differences between Accord Hybrid and an Accord EX V-6

ngine booming sound

herently created inside any engine that has cylinder

he Active Noise Control uses microphones in the front

enger cabin to monitor the low-frequency “booming” noise created by three-

suspension ensures accurate tracking at all vehicle speeds, while the rear 5-link double wishbon

suspension mounted to the car’s subframe helps to limit body roll during cornering and als

isolates the cabin from road noise.

Electric Power Steering also contributes to higher fuel economy (engine power is not needed to

pump t

th

designed to provide

The Accord Hybrid Sedan also employs a similar braking system as to that of the Accord EX

V-6, which includes ventilated discs in the front and solid discs in the back. Braking is further

enhanced by a standard 3-channel anti-lock braking system (ABS) and electronic b

distribution (EBD). Accord Hybrid has wider 215/60 R16 tires compared to those on the EX

V-6 Sedan.

Interior Overview Continuing Honda’s strategy of inc

v

Sedan. The main differences are the unique instrument panel meter display that shows the IMA

system’s charge and assist status, IMA battery charge levels, “ECO” light indicating VCM

operation, along with trip and lifetime fuel economy readouts. Less obvious, but much more

significant is Active Noise Control (ANC) – which helps to reduce the e

in

deactivation, and a new hybrid air conditioning unit that is

powered by a combination of the gasoline engine’s drive belt

and a supplemental electric motor depending upon cooling

needs.

T

and rear of the pass

cylinder engine operations. It then generates a counter-cycled sound wave through the car’s

audio system that effectively cancels the booming noise.


The hybrid air conditioning unit uses two air compressors, one connected to the gasoline engin

and one connected to an electric motor. When full cooling is needed, as when a car is first

started on a hot summer day, the HVAC control unit relies on both to create maximum cooling

power. Under normal conditions, cooling is provided by either the belt-driven compressor

attached to the 3.0-litre V-6 or by the electric magnet driven compressor powered by the IMA

battery. This allows the air conditioning system to work at virtually all times, even when the car

is at idle-stop.

e

ts, a

afety Overview

rotect

es

nti-lock braking system, electronic brake distribution, and a 2nd-generation

action control system (TCS).

The Accord Hybrid Sedan features a standard leather-trimmed interior with heated front sea

6-disc in-dash CD changer, dual-zone automatic climate control, power windows, mirrors and

door locks and a HomeLink remote system.

S The Accord Hybrid Sedan retains all of the Accord’s class-leading safety technology, including

dual-stage, dual-threshold front airbags, dual front side airbags and side-curtain airbags to p

front and rear passengers in the unlikely event of a rollover impact.

In addition to the advanced passive safety technology of the Accord Hybrid Sedan, it also utiliz

the same active systems as all Accord V-6 sedans. This includes four-wheel disc brakes with a

three-channel a

tr


2005 Honda Accord Hybrid Sedan Powertrain

Overview Hybrid powertrains were developed originally to enhance fuel efficiency, and the IMA system in

the Accord Hybrid is no different in that regard, helping the V-6 sedan achieve an estimated 7.9

L/100km city / 5.9 L/100km hwy. What sets this iteration of Honda’s Integrated Motor Assist

apart from previous systems is the fact that along with the increase in fuel efficiency comes a

marked gain in horsepower, torque and performance – making the Accord Hybrid Sedan the

industry’s first high performance hybrid car, delivering the power of a high-performance V-6

engine with the fuel efficiency of a 4-cylinder car.

Along with excellent fuel efficiency, the combination of this Accord’s 3.0L i-VTEC V-6 engine

with Variable Cylinder Management and Honda’s 3rd generation IMA system produces 255

horsepower (+6.3% over an Accord EX V-6) and 232 lb.-ft. of torque (+9.4%). Internal testing

shows the IMA’s motor assist helps the Accord Hybrid improve its 0-60 km/h time to 7.5

seconds versus 8.0 seconds for Accord EX V-6 Sedan, with the powertrain producing torque in a

constant, flat manner – 90 percent of peak torque (232 lb.-ft) available below 4000 rpm.

2005 Accord Hybrid Sedan - 1 - POWERTRAIN

Accord Hybrid Powertrain Highlights

• Peak power: 255 hp @ 6000 rpm, 232 lb.-ft. torque @ 5000 rpm 3.0L V-6 engine • Lightweight, durable aluminum alloy block • Single Overhead Cam (SOHC) head with i-VTEC • Magnesium head cover • Variable Cylinder Management (VCM) • 4-valves per cylinder • Programmed Fuel-Injection (PGM-FI) • 6500 rpm redline • Active Control Engine Mount System (ACM) • Idle-stop feature Integrated Motor Assist (IMA) Electric Motor • 3rd-generation of Honda’s patented gasoline-electric hybrid system • Thin (68mm), brushless DC motor (vs. 65mm in Civic Hybrid) • Peak assist: 16.1 hp / 100 lb.-ft of torque (vs. 13 hp / 46 lb.-ft. in Civic Hybrid) • Peak generation: 14 kW (vs. 12.6 kW in Civic Hybrid) • Maximum electrical current: 120 Volts (vs. 75V in Civic Hybrid) • Intelligent Power Unit – Power Control Unit, Nickel-Metal Hydride (Ni-MH) battery pack

and Integrated cooling system • Regenerative braking • Improved 5-Speed Automatic Transmission 3.0-Litre SOHC i-VTEC V-6 engine At the heart of the Accord’s power plant is the same 3.0L V-6 engine as that in the Accord EX

V-6, but with a few modifications to reduce space and weight and to allow for the installation of

the IMA motor and new VCM system. This 60° V-6 engine is designed to require only minimal

maintenance, with its first scheduled tune-up at 160,000 kilometers.


Aluminum alloy block Like all Honda engines, the 3.0L i-VTEC engine used in the Accord Hybrid is built around a

lightweight and durable aluminum alloy block that provides significant weight and long-term

corrosion benefits over traditional iron blocks. The 60º V-6 block incorporates extra brackets to

allow the mounting of the VCM’s magnesium composite head cover and the IMA motor.

To further enhance durability, each cylinder contains cast-iron liners, while the crankshaft and

each of the two camshafts are made of forged steel designed to minimize friction.

i-VTEC Engine with Variable Cylinder Management One major improvement new to this

engine is the implementation of the

advanced version of Honda’s variable

valve-timing and lift electronic control

(VTEC) system or i-VTEC. i-VTEC adds

a level of “intelligence” to the legendary

VTEC system by adding a Variable

Cylinder Management (VCM) system that

switches between six- and three-cylinder

combustion. When high output is

required, such as during startup and

acceleration or when climbing hills, the

engine operates on all six cylinders to

deliver superior performance. During

cruising and at low engine loads, the

system idles the rear bank of three

cylinders for improved fuel efficiency and reduced emissions. Further, the idled cylinders

remain sealed, alleviating the pumping losses associated with intake and exhaust and giving fuel

economy a further boost.


Variable Cylinder Management helps maximize fuel efficiency by making the Accord Hybrid’s

3.0L V-6 engine effectively run on only three cylinders when the power needs are minimized,

yet it can still seamlessly provide the full power of all six cylinders during hard acceleration or

other high load situations. When full power is needed, i-VTEC instantly opens the valves and

sends fuel to the three previously idled cylinders. When combined with the IMA motor, output

peaks at 255 horsepower.

The Accord Hybrid’s VCM system is similar to the VTEC-controlled Cylinder Idling System

used on Civic Hybrid, but is more sophisticated. Whereas the Civic Hybrid’s cylinder idling

deactivates three of the engine’s four cylinders during deceleration only to help improve

regenerative braking efficiency, the Accord’s VCM system is able to deactivate the engine’s rear

bank of three cylinders during a variety of driving situations, including steady-speed cruising,

light acceleration and braking. This is designed to improve fuel efficiency, reduce emissions and

make regenerative braking more efficient.

VCM Operation The Accord Hybrid’s i-VTEC V-6 engine features a Variable Cylinder Management (VCM)

system that improves fuel economy by idling three of the Accord’s six cylinders during cruising

and deceleration. VCM deactivates the rear bank of cylinders by using the VTEC (Variable

Valve-Timing and Lift Electronic Control) system to close the intake and exhaust valves while

cutting fuel at the same time.

The rear bank of cylinders was chosen for deactivation because the front bank is best positioned

for cooling performance. Idling the rear bank also helps to maintain the temperature of the

catalytic converter beneath the cylinder heads, helping to maintain optimum emissions

performance. The Accord Hybrid’s spark plugs continue to fire even when the cylinders are

deactivated. This minimizes plug temperature loss and prevents fouling induced from incomplete

combustion during cylinder re-activation. Further, sparking in air alone results in higher

voltages than in a fuel-air mixture because of the higher insulation resistance; therefore, iridium-

tipped spark plugs are used for their high resistance to wear at high voltages.


i-VTEC VCM System Designed for Rapid Switching at Low Engine Speeds

In a conventional VTEC system, hydraulic pressure pushes a single synchronizing piston, which

is in turn pressed back by a return spring. The VTEC system locks the valvetrain’s rocker arms

to allow additional valves to open and increase engine breathing. Such systems require relatively

high engine speeds since hydraulic pressure is used to push the spring. VCM, however, demands

switching at low rpm. This is achieved by creating a hydraulic circuit with two systems, each

capable of providing the hydraulic pressure required to push the synchronizing piston in the

required direction. This design thereby allows switching from six cylinders to

three cylinders in low-speed ranges. To achieve

responsive switching to six cylinders when the

driver quickly opens the throttle under hard

acceleration or driving up hill, the system

employs a new three-way solenoid spool

valve to control the oil pressure for

switching. These enhancements

result in highly responsive VCM

switching regardless of engine

speed.

VCM monitors throttle position,

vehicle speed, engine speed,

automatic-transmission gear selection, and other factors to determ

decelerating. During cruising and deceleration, VCM deactivates

bank of the engine. To further enhance control, the system also s

whether engine oil temperature is suitable for VCM switching an

temperature will remain in the proper range. While idling the cyl

ignition timing, and turns the torque converter lock-up on and off

induced jolting during the switch from six to three cylinder opera

seamless switch between three and six cylinder modes that is nea


i-VTEC Valvetrain

ine if the vehicle is cruising or

the three cylinders on the rear

imultaneously determines

d whether catalytic converter

inders, the system controls

, thereby suppressing torque-

tion. The result is a smooth,

rly unnoticeable to the driver.

POWERTRAIN

For cylinder deactivation operation, the synchronizing piston moves to isolate the valve-lift

rocker arms from the deactivated cylinders’ rocker arms. The deactivated cylinder rocker arms

are operated by zero-lift cams that deactivate the cylinders by closing the intake and exhaust

valves.

Active Control Engine Mount System (ACM)

Due to the inherent increase in engine vibration when VCM has deactivated the rear bank of

cylinders, an Active Control Engine Mount system (ACM) is used to minimize the effects of

engine vibration. The system uses sensors that alert the Electronic Control Unit (ECU) to direct

ACM actuators to move in synch with the vibration, thereby eliminating the vibration being

transmitted to the passenger compartment. Additionally, an Active Noise Control system (ANC)

works in cooperation with the ACM. An ANC controller with front and rear microphones in the

passenger cabin detects the booming noise associated with cylinder deactivation and instructs the

audio system’s speakers to emit an opposite sound wave. (See the Interior section for more

information on ANC.)

Idle stop

As with previous versions of Honda’s hybrid powered cars, the IMA system incorporates an idle-

stop feature that temporarily turns off the gasoline engine when the vehicle comes to a stop from

speeds over 16 km/h (10 mph). In this situation, the IMA’s ECU monitors the closed throttle,

speed and brake pressure to determine the driver is bringing the car to a stop. The engine is

turned off when the car’s speed drops below 16 km/h. When the brake pedal is released, the

IMA’s motor restarts the engine and power is available immediately.

Unlike the idle-stop feature in the Insight and Civic Hybrid, the Accord Hybrid system continues

to operate even while the car’s automatic climate control system is in use. This is made possible

by the introduction of a new hybrid air conditioning system, which uses air compressors powered

by both the gasoline engine’s drive belt and IMA electric motor (see Interior). Idle-stop is

unavailable only when the car is first started on an extremely hot day when maximum cooling is

required.


IMA System

The 3rd-generation IMA system is the largest and most efficient to come out of Honda’s hybrid

development program. As with previous versions, the IMA system consists of an ultra-thin DC

brushless electric motor mounted between the gasoline engine and the automatic transmission,

and an intelligent power unit (IPU) that stores electric power in a compact battery box and

controls the flow of electricity to and from the electric motor. Also new with this generation of

the IMA is the mounting of a 15cc air compressor to the electric motor which provides increased

cooling capacity to the Accord Hybrid’s dual-zone automatic climate control system (see

Interior).

IMA Electric Motor

Providing supplemental power boost to the V-6

engine, the IMA’s electric motor is designed to

provide up to 12 kW (16 hp) and 136 Newton-

Meters (100 lb.-ft) of additional power and torque to

the Accord Hybrid’s engine. Mounted between the

engine and the Accord Hybrid’s 5-speed automatic

transmission, the IMA motor is an ultra-thin (68

mm) DC brushless design and provides a substantial

amount of low-end torque to aid in hard acceleration

and hill climbing. r

In addition to providing supplemental power, the IMA motor acts

deceleration and braking to recapture kinetic energy and recharge

regenerative braking, and provides power to the dual scroll hybrid

Accord’s dual zone hybrid automatic air conditioning system (see


IMA Electric Moto

as a generator during

the IMA’s battery pack during

A/C compressor used in the

Interior).

POWERTRAIN

For this third generation of IMA motors, a new internal permanent magnet was designed to

increase output density and make the motor more efficient than

previous motors. At startup, the Accord hybrid provides 26

percent more starting torque than the Civic Hybrid. During

driving, the motor provides a 20 percent increase in horsepower

assist and more than doubles peak torque (100 lb.-ft. from 46 lb.-

ft) compared with the Civic Hybrid’s IMA motor; and it is more

efficient, now converting 97.5 percent (versus 94.6 percent

efficiency of Civic Hybrid IMA) of the available electricity into motive energy in assist mode.

Magnet

Sil el icon Ste

IMA Intelligent Power Unit (IPU)

Power for the IMA system is controlled through the Accord Hybrid’s Intelligent Power Unit.

Located directly behind the rear seatback, the IPU consists of the Power Control Unit (PCU) – or

the IMA’s brain, a rechargeable Nickel Metal-Hydride battery module, and an integrated cooling

unit.

• Power Control Unit (PCU) – Electronically controls the flow of energy to and from the

IMA’s electric motor. Using the latest in computer chip technology, the PCU’s response time is quickened over previous versions, and a new inverter and DC/DC Converter help contribute to the IMA’s overall increase in peak power.

• Battery Pack – Energy for the IMA motor is stored in a bank of Nickel Metal-Hydride

cells. This bank of 120 1.2V units stores up to 144 Volts of electrical energy for the IMA motor, as in previous versions. But a new SANYO dual module casing reduces weight from previous hybrid battery packs and also allows it to increase efficiency of the electrical flow.

• Integrated Cooling Unit – To offset the heat generated by the constant flow of electricity to

and from the battery pack, an integrated cooling system is mounted directly on the battery pack’s outer box. Interior cabin air is continually flowed over the battery pack, and recirculated via a small vent placed on the rear parcel shelf.


Regenerative braking

A key to the long-term viability of hybrid-powered vehicles is their ability to recapture kinetic

energy via regenerative braking and store this energy as electricity in rechargeable battery packs.

Accord Hybrid is no different, as its IMA electric motor also acts as a generator to recharge its

battery pack during steady cruising, deceleration/coasting and braking.

Accord Hybrid’s efficiency in generating

electricity from braking energy is enhanced by

a more efficient IMA motor/generator, the

ability of the engine and transmission to

minimize friction through the VCM system

and a modified 5-speed automatic

transmission. Exploiting these friction-saving

features during electricity generation, the IMA

motor is able to convert 95.2 percent of the

available kinetic energy into electricity to store

in the IMA’s rechargeable battery pack. This

is an improvement of almost two percentage

points over the previous Civic Hybrid’s

generator efficiency (93.5%).

This greater efficiency is achieved through more efficient cooperation between the transmission

and the IMA motor, and a more sophisticated the idle stop feature that cuts fuel to the engine and

reduces excess friction losses due to engine idling.

5-Speed Automatic Transmission

To increase performance through quicker shifts and a wider range of gear ratios and to aid the

IMA system’s ability to recapture kinetic energy through regenerative braking, Accord Hybrid

employs a new 5-speed automatic transmission.


Sixty millimeters thinner than the version of 5-speed transmission used on the current Accord

EX V-6, this transmission contributes to improved fuel efficiency through a new lockup clutch

torque converter that shortens shift response during acceleration, more immediate startup after

idle-stops by using of an integrated electric oil pump, and smoother ride during hard

acceleration. A new long torsion damper works with the VCM system to increase the rpm range

where VCM can be activated which contributes to improved fuel economy.

5-Speed Automatic Transmission, Gear Ratios

Accord EX V-6

Accord Hybrid

First 2.563 2.685

2nd 1.552 1.565

3rd 1.021 1.023

4th 0.727 0.729

5th 0.520 0.530

Reverse 1.846 1.888

Final Drive Ratio 4.428 4.375 Integrated Electric Oil Pump In order to generate the hydraulic pressure necessary to

shift gears through its torque converter, most automatic

transmissions experience a lag between shifts while the

engine spins the drive shaft and the counter-spinning

torque converter spins to create oil pressure. The A

Hybrid eliminates this lag, which subsequently improve

fuel efficiency, by using an integrated electric oil pump

to constantly pump oil through the transmissi

converter. This is particularly important for the Acco

Hybrid when restarting after an idle stop when the

gasoline engine is providing no power to the drive shaft.

ccord

s

on’s torque

rd


High-response lockup clutch torque converter

addition to the electric oil pump which maintains consistent pressure within the transmission,

r

combination with the integrated oil pump, this new high-response lockup clutch torque

ternal testing shows Accord Hybrid achieving an estimated fuel economy rating of 7.9

ver

In

the torque converter itself employs an advanced, compact design that improves shift response

time to one-third of that in the Accord EX V-6’s automatic transmission. Regardless of gear, o

vehicle speed, shift engagement takes place in less than half a second, which results in smoother

acceleration and improved fuel economy.

In

converter helps improve city fuel economy.

In

L/100km in the city and 5.9 L/100km highway, up from 11.4 L/100km city / 7.3 L/100km

highway for the 2004 Accord EX V-6 Sedan – a fuel economy gain of 31 percent and 21

percent, respectively. The Accord’s Integrated Motor Assist System (60%) accounts for o

half the gains in city fuel efficiency, while Variable Cylinder Management (15%) and idle stop

(25%) is responsible for the rest. During highway cruising, the VCM system (57%) provides the

majority of the increase, while IMA (38%) and a lower drag coefficient and greater

aerodynamics (5%) also contribute.


2005 Honda Accord Hybrid Sedan Interior

Overview In the Accord Sedan lineup, the Accord EX V-6 serves as the near-luxury model for Honda’s

award-winning mid-sized sedan, offering features such as a leather-trimmed interior, dual zone

automatic climate control, tilt and telescoping steering wheel, and an AM/FM stereo with 6-disc

in-dash CD changer – features not available or only available as extra-cost options on many

luxury cars, much less any high-volume intermediate sedan. The Accord Hybrid Sedan

maintains that high level of feature content, and adds even more, making it the most luxurious

and well-equipped hybrid sedan on the market.

Some of the most significant features on the Accord Hybrid’s interior, by design, go virtually

unnoticed at first glance. A new Active Noise Control (ANC) system monitors engine noise

within the passenger cabin and counteracts the noise inherently associated with its Variable

Cylinder Management to effectively provide an ultra-quiet interior, and a new hybrid air

conditioning system uses power from both the engine and an electric motor to increase cooling

performance in the car’s interior and helps to further reduce fuel consumption.

Key interior features

Interior Appearance • Exclusive IMA display monitors charge/assist performance, battery charge and fuel economy

statistics • Self-illuminating gauges • Leather-trimmed interior

2005 Accord Hybrid Sedan - 1 - INTERIOR

Comfort and Convenience • Active Noise Control counteracts booming sounds during 3-cylinder engine operation • Honda-exclusive dual zone hybrid automatic climate control system • Power windows, mirrors and door locks • 6-disc in-dash CD changer • • 8-way power adjustable driver’s seat • Tilt and telescopic steering column Safety • Dual-stage, dual-threshold front airbags with a passenger-side Occupant Position Detection

System (OPDS) • Dual front side airbags (seat mounted) • Side curtain airbags (headliner mounted) With the Accord Hybrid’s IMA intelligent power unit (IPU) located behind the rear seats, the

Accord Hybrid’s rear seats are fixed and total cargo space is reduced slightly to 11.2 cu. ft. (vs.

14.0 in all other Accord Sedans) – still spacious enough to carry the luggage and equipment

carried by most mid-sized sedan buyers.

Interior Dimensions As with all Accord Sedans, the roomy interior in the Accord Hybrid puts it at the top of the mid-

size segment and on the verge of a full-sized sedan. With 1683 litres (102.7 cu. ft.) of total

passenger volume, the Accord Hybrid is the largest and most spacious hybrid car on the market.

Accord Hybrid Interior Specifications (vs. Toyota Prius) Accord Hybrid Prius

Headroom (mm, front/rear) 1026 / 978 993 / 942 Legroom (mm, front/rear) 1082 / 935 1064 / 980

Shoulder room (mm, front/rear) 1445 / 1425 1405 / 1346 Hip room (mm, front/rear) 1387 / 1359 1295 / 1311

Total Passenger Volume (litres) 1683 1576 Instrument Panel


In keeping with the Accord Hybrid’s goal of seamless integration of new technology into the

Accord’s existing framework, its instrument panel display is only slightly different from that in

an Accord EX V-6 Sedan.

Instrument Panel Display

The primary difference is the small LCD display below the speedometer that shows all of the

IMA systems’ key statistics, including the level of charge/assist activity for the IMA motor,

overall average fuel economy and an ECO mode display that illuminates when the car is being

driven most efficiently.

IMA Status Display in Instrument Panel

During acceleration, when the engine requires

extra power from the IMA motor, the blue

ASSIST bars illuminate out to the right depending on the level of assist needed. Conversely,

during regenerative braking when the IMA motor is generating electricity for the battery pack,

the green CHARGE bars illuminate from right left to indicate the amount of regenerative

charging.

The LCD display also includes the odometer and dual trip meter functions of all Accords and a

new exterior temperature indicator. Other key indicators integrated into the Accord Hybrid’s

illuminated gauges include a blinking display in the tachometer to alert the driver when the car is

idle-stopped and a battery charge meter under the fuel gauge to show the level of charge in the

IMA’s intelligent power unit (battery pack).


Dual Zone Hybrid Automatic Climate Control System Unlike previous iterations of Honda’s hybrid vehicles, the power generated from the gasoline

engine and IMA hybrid system is used for more than just drive power. This 3rd generation IMA

system also introduces a dual scroll hybrid air conditioning system that reduces the load of the

gasoline engine by using a combination of engine and electric motor to drive two smaller air

compressors. These compressors can act independently or together as dictated by the cooling

needs of the Accord Hybrid’s dual zone automatic climate control system.

On extremely hot days, cooling is provided by both the 75cc belt-driven compressor attached to

the Accord’s 3.0L V-6 engine and the 15cc, 144V motor-driven compressor attached to the a

small secondary motor. When the air conditioning system is forced to use both the gasoline

engine and electric motor, the Accord’s idle-stop feature is disabled until cooling needs are

reduced.

In all other situations, either of the two compressors cools the interior cabin individually

depending upon cooling needs and the charge state of the IMA’s battery pack. On warmer days,

the 75cc engine-mounted compressor acts as the sole source of air-conditioning, while the 15cc

motor-driven compressor is in action when the climate control is maintaining a steady

temperature or the car is idle-stopped.


Active Noise Control A feature found in many luxury cars, Honda’s Active Noise Control was specified for Accord

Hybrid to counteract the extra noise created by the imbalanced motion of the car’s V-6 engine

when the VCM system deactivates the rear engine bank’s three cylinders. In this condition, the

booming noise of the engine is more spread out, and thus more noticeable to the naked ear.

Active Noise Control (ANC) Operation

The ANC uses input from the engine’s ECU and microphones in the cars interior – one mounted

in the front headliner and one in the rear parcel shelf – to monitor noise levels in the passenger

cabin. When the ECU puts the i-VTEC V-6 engine in 3-cylinder mode, a control unit

synchronizes the booming noise created with an opposite phase signal sent through the car’s

audio system to essentially cancel each other out. The result is an audio signal with an opposite

wave and a very quiet interior. ANC works whether the radio is on or off.

ANC

Booming noise

rpmmm

Noise cancellation

Active Noise Control Sound Frequency Cancellation Illustration

The Active Noise Control is only active when the engine is in 3-cylinder operation, and operates

regardless of whether the audio system is on or off. The microphones are tuned to only recognize

the engine booming noise. Other noises such as passenger’s conversation, the audio system, or

excess road noise have no affect on the system.


Interior Safety Systems Already a recognized leader in low-emissions and high fuel efficiency, the Accord has also

become a leader in safety technology in the intermediate sedan category. With a full array of

both active and passive safety features, 2004 Accord was awarded the top rating, 5 stars, by the

National Highway Traffic and Safety Administration (NHTSA) in the U.S. for driver and front

passenger safety in full frontal impacts.

The 2004 Accord also achieved a Good rating and Best Pick designation by the Insurance

Institute for Highway Safety (IIHS) – its top rating – for 40-mph offset frontal impact protection.

The Accord Hybrid carries over all

of the safety technology built into its

traditional Accord EX V-6 Sedan,

including dual-stage, dual-threshold

front airbags, dual front side airbags,

and a side curtain airbag system.

Accord Sedan Airbag Systems


2005 Honda Accord Hybrid Sedan Body and Exterior

Overview

When the seventh-generation Accord Sedan debuted in 2003, it was designed to be a more

dynamic overall package. The goal was to package traditional Accord features and value into a

new, more sensual design. Now, the Accord Hybrid Sedan takes that original, tall-sedan style

and adds features intended to conserve weight and better the aerodynamics of the Accord.

Unique aerodynamic features of the Accord Hybrid include 16-inch alloy wheels and a standard

rear decklid spoiler. Unique appearance features include a black chrome-style front grille,

exclusive Accord Hybrid badging and a roof-mounted AM/FM radio antenna.

The Accord Hybrid also makes use of lightweight aluminum in its frame and body panels to

further reduce body weight for both efficiency and to maintain the same dynamic character of the

Accord V-6 Sedan.

Key Body and Exterior Features

• Rigid, unibody construction • Active Control Engine Mounts (ACM) • Black chrome-style front grille • Standard rear decklid spoiler • Lightweight 16-inch alloy wheels • Larger 215/60 R16 tires • Unique AM/FM roof antenna • Exclusive Accord Hybrid badging

2005 Accord Hybrid Sedan - 1 - BODY / EXTERIOR

Unibody Construction The Accord Hybrid is built from a unibody frame that combines the principal body panels and

platform into one integrated assembly. Greater use of aluminum in many frame parts, including

the entire hood, helps contribute to the Accord’s excellent fuel efficiency but maintains a rigid

foundation for a smooth, controlled ride at all speeds. The Accord Hybrid’s unibody continues

to incorporate front and rear subframes that are designed to deform in a controlled manner in the

event of frontal or rear impacts. By doing so, the subframes absorb a substantial amount of the

impact energy before it enters the passenger cabin. In conjunction with seat belts and the Accord

Hybrid’s dual-stage front airbags, the frame is a primary contributor to the Accord’s projected 5-

star frontal impact rating from the U.S. federal government.

Exterior dimensions Outside of curb weight, there are no measurable exterior differences between the Accord Hybrid

and the Accord EX V-6, which makes it the largest and most spacious hybrid car on the U.S.

market to date. Though the Accord Hybrid’s frame uses more aluminum, the shape and

dimensions all remain unchanged from the traditional Accord Sedan. It continues with a 2740-

mm (107.9”) wheelbase, with an overall length of 4813 mm (189.5”). Front and rear track are

unchanged at 1553 mm (61.1”) and 1554 mm (61.2”), respectively, as is the Accord’s 4813 mm

(71.5”) overall width and 1449 mm (57.1”) height. By keeping the Accord Hybrid’s footprint

and dimensions in line with the traditional Accord Sedan, few changes are needed in the

suspension and steering arenas to keep ride and handling characteristics on par with the nimble

Accord EX V-6.

Extensive use of aluminum From the top of the Accord Hybrid to its wheels, lightweight aluminum plays a very important

role in helping to reduce weight, but maintaining structural rigidity and long-term durability.

Most noticeable are the lightweight aluminum-alloy wheels, but underneath the paint, much

more aluminum is present. In

addition to many non-structural

elements of the Accord

Hybrid’s frame, the hood, front

and rear bumper beams and


rear suspension knuckles are made from aluminum.

Safety design With the same basic body frame and design as an Accord EX V-6 Sedan, the Accord Hybrid is

designed to surpass all current government regulations for safety. With a rigid unibody frame,

front and rear crush zones that reduce impact energy before it gets to the passenger cabin and

side impact door beams, Accord Hybrid is designed to achieve 5-star safety ratings for frontal

impact protection by the U.S. National Highway Traffic and Safety Administration. The 2004

Accord Sedan was awarded 5-star ratings for frontal impacts by NHTSA and was given a good

rating – the highest possible – and designated a “best pick” by the Insurance Institute for

Highway Safety (IIHS) in 40-mph offset frontal impacts.

Lightweight alloy wheels Like all performance cars, Accord Hybrid comes with a set of

aluminum-alloy wheels to keep unsprung weight down and to

give the car a distinctive look. Measuring 16 inches, the wheels

on the Accord Hybrid display a distinct 5-spoke design and are

machine finished for a luxurious, yet understated look. They are

accompanied by larger 215/60 R16 tires (vs. 205/60 R16 tires on

the Accord EX V-6) to match the vehicle’s increased

performance. s

NVH performance Numerous technologies on the Accord Hybrid are intended to help red

harshness (NVH), among them new Active Control Engine Mounts (A

and an interior Active Noise Control (ANC) system (See Interior).

Accord Hybrid’s frame continues to use hydro-formed steel componen

effects of high-tensile strength steel. This precise way of forming stee

manufacturing inconsistencies for the unibody frame and major subfra

creates a stronger, more rigid frame than previous generations of Acco


Accord Hybrid Wheel

uce noise, vibration and

CM) (See Powertrain)

ts that maximize the

l reduces the

me components, and

rd.

BODY / EXTERIOR

Additionally, special floating rubber mounts that connect the frame and each of the front and rear

subframes, help minimize both road and engine noise. To insulate the Accord Hybrid’s interior

from external noises, it uses a number of sound damping materials and special melt sheets on the

cabin floor to further isolate the interior cabin.

Aerodynamics Already one of the more aerodynamically slick sedans in the mid-sized segment with a 0.30

coefficient of drag (Cd), the Accord Hybrid adds a rear decklid spoiler and aerodynamic wheels

to slightly reduce drag even further. The result is a .29 Cd, which is similar to many sport

coupes on the market today.

As with all Accords, an aerodynamic design translates into greater fuel efficiency and a quieter

interior cabin, virtually void of any wind noise even at higher speeds. Design details that

contribute to this low drag include windshield wipers that are recessed below the hoodline, side

mirror design and distinct A-pillar design that smooths air flow over the windshield and around

the side of the car.

Available Colours Two current Accord Sedan colors form the foundation of Accord Hybrid’s color palette –

Nighthawk Black Pearl, and Satin Silver Metallic. A hybrid-exclusive Silver Frost Metallic will

also be offered. The new Silver Frost Metallic will be paired with a leather-trimmed ivory

interior, while Nighthawk Black Pearl, and Satin Silver Metallic come with a black leather

interior.


2005 ACCORD HYBRID FEATURES2005 ACCORD HYBRIDEXTERIOR FEATURESAlloy Wheels Exclusive 16"Body-Colored Door Handles and Dual Power MirrorsBody-Colored Side MoldingChrome Window TrimBody-Colored Impact-Absorbing BumpersRemote Keyless Entry with Window ControlsSecurity SystemRear Spoiler

INTERIOR FEATURESDual-Stage Front Airbags (SRS)Front Side Airbags with Passenger-Side Occupant Position Detection System (OPDS)Side Curtain Airbags3-Point Seat Belts at all Seating PositionsFront 3-Point Seat Belts with Automatic Tensioning SystemAdjustable Front Seat Belt AnchorsSide-Impact Door BeamsRear-Center Child-Seat Tether AnchorsLower Anchors and Tethers for Childern (LATCH) for rear outer positions OutboardChild Proof Rear Door LocksDriver's Seat with 8-Way Power AdjustmentDriver's Seat Adjustable Lumbar Support Passenger's Seat w/4-Way Manual AdjustmentExclusive Instrument PanelLeather-Trimmed Seats and Door Panel InsertsHeated Front SeatsLeather-Wrapped Steering WheelLeather-Wrapped Shift KnobPower Windows w/Auto Up and Down Driver's WindowIlluminated Power Window SwitchesPower Door LocksImmobilizer Theft Deterrent SystemCruise ControlDual Zone Automatic Climate Control SystemExternal Temperature Gauge120-Watt AM/FM/6-Disc-in-Dash CD Changer Audio System w/6 SpeakersSteering Wheel-Mounted Audio ControlsHomeLink Remote SystemPremium Interior AccentsMap LightsBeverage Holders, Front and Rear (8 total)Floor MatsSunglasses HolderCenter Console with Sliding Armrest and Storage CompartmentsAccessory Outlet in Center Console

2005 ACCORD HYBRID FEATURES

2005 ACCORD HYBRID INTERIOR FEATURES (cont.)Center Console Coin HolderTilt/Telescope Adjustable Steering ColumnProgressive Self-Illuminating GaugesTachometerDigital Odometer and Digital Trip MetersVariable Intermittent Windshield WipersInterior Ambient Console LightingRemote Fuel Filler Door ReleaseRemote Trunk Release with LockEmergency Truck OpenerTrunk/Door-Open Indicator LightFuel and Coolant Temperature GaugesLow-Oil-Pressure and Low-Brake-Fluid Indicator LightsRear Window Defroster Cargo Area LightDual Illuminated Vanity MirrorsRear Seat Heater DuctsLockable Glove Compartment w/LightQuartz Digital ClockMaintenance Interval Indicator

Equipment, colors, models, specifications and availability are subject to change without notice.

2005 Honda Accord Hybrid Sedan -...

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