ZACH MICHEL, JONATHAN SCISLOW JAMIE OTTMAR, WENXIAO ZENG HYBRID FORMULA CAR SD1115.
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Transcript of ZACH MICHEL, JONATHAN SCISLOW JAMIE OTTMAR, WENXIAO ZENG HYBRID FORMULA CAR SD1115.
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Z A C H M I C H E L , J O N A T H A N S C I S L O WJ A M I E O T T M A R , W E N X I A O Z E N G
HYBRID FORMULA CARSD1115
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PROBLEM: CRUDE OIL DEPENDENCY
• The United States is responsible for 25% of the world’s oil consumption
• Major contribution to pollution• 1000 barrels of crude oil extracted every second
• Info from: http://www.oildependency.org/
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SOLUTION: HYBRID VEHICLES
• Electric vehicles are a greener alternative• Inconvenience of charging• Technology has come a long way• Hybrid alternatives allow for less pollution while
still having an IC engine
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FORMULA HYBRID
Formula Hybrid™ is a design and engineering challenge for undergraduate and graduate college and university students. They must design, build, and compete an open-wheel, single-seat, electric or plug-in hybrid-electric racecar. This car must conform to a formula which emphasizes drive train innovation and fuel efficiency in a high-performance application.
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FORMULA HYBRID INTERNATIONAL COMPETITION
• The Society of Automotive Engineers (SAE) established the Formula Hybrid competition in 2006, with the 1st competition held in 2007 featuring only 6 universities• As of December 6, 2011, 27 teams from 3
countries are registered to compete in the 2012 competition.
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JUDGED EVENTS
Dynamic Events• Acceleration Runs (electric & unrestricted)
– 75 points each• AutoCross
– 150 points• Endurance Run
– 400 Points
Static Events• Presentation
– 100 points• Design
– 200 points
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COMPETITION DESIGN CONSTRAINTS
Design restrictions include:• Each vehicle is allotted 19.5 Mega Joules of
energy (Fuel and Accumulators combined)• Teams cannot spend more than $7,200 on
accumulators (batteries, super-capacitors, etc.)• Other design constraints are also involved for
safety and other reasons
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DRIVETRAIN CONFIGURATIONPARALLEL VS. SERIES
Series
• Electric motor provides all power to the wheels.
• Power is received from batteries or a generator driven by a gas engine.
• Batteries may be recharged by generator and regenerative breaking.
• Advantages• Simplest hybrid configuration• Requires small IC engine• Works well in stop-and-go
conditions
• Disadvantages• Requires larger battery capacity
and electric motor.• Expensive configuration
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DRIVETRAIN CONFIGURATIONPARALLEL VS. SERIES
• Gas engine and electric motor power the wheels.
• Engine is connected directly to wheels, eliminating inefficient energy conversion
• May use regenerative braking to charge batteries
• Advantages• Requires smaller battery capacity• Eliminates inefficient energy loss• Works well in highway condition
• Disadvantages• Inefficient in stop-and-go
situations.
Parallel
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DRIVETRAIN CONFIGURATIONPARALLEL VS. SERIES
• Combines advantages of series and parallel setup.
• Gas engine can directly drive wheels or be disconnected.
• Advantages• Maximum efficiency• Flexibility
• Disadvantages• Computer system is much more
complex.• Requires large battery back and a
generator, which results in a very expensive system
Series-Parallel
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3-PHASE AC INDUCTION MOTOR
• Power is supplied to rotor by electromagnetic induction• Speed is easily
controlled• Simple motor setup• High power availability• Smooth power and
control• Generally have lowest
cost among electric motors
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AC – 15 ELECTRIC MOTOR
• Manufactured by HPEVS and purchased from Thunderstruck Motors
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A CLOSER LOOK
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CURTIS 1238R MOTOR CONTROLLER
• Tennant offered to donate a motor controller• The Curtis 1238R was the only controller which
was able to handle the high current requirements• Programmed using Vehicle Control Language• Curtis 1311 Handheld programmer included
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CURTIS 1238R CONTINUED
• The Curtis 1238R is able to operate in torque control mode• Perfect for parallel hybrid configuration•Designed for 72-96V systems• 2 minute RMS current rating – 550A•Meets IP65 environmental sealing standard
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CURTIS 1238R CONTINUED
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BATTERY CHEMISTRY
Lithium-Ion• Very reliable• Can handle high
amounts of current• Ideal for powering
electric motors• Heavier than
lithium-polymer
Lithium-Polymer• Can handle even
more current than lithium-ion• Lightweight• Cheaper cells• Less reliable• Complex charging• Unstable
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LITHIUM-ION BATTERIES
• Rechargeable prismatic cells• Reduces cost and
complexity• Safer than other
lithium based batteries• High energy density • Handle high current• Chose to go with
LiFePO4 chemistry
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MOLECULAR STRUCTURE
• Molecular formula: LiFePO4
• Li has +1 valence charge• Fe has +2 valence charge• PO4 has -3 valence charge• Used as cathode material in lithium-ion batteries• Inexpensive, non-toxic, and environmentally
friendly• Requires less intense charge monitoring• Slightly lower energy density than other lithium
ion chemistries
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BATTERY COMPANIES/DISTRIBUTORS
CONSIDERED
•Flux Power•Thundersky•Calib Power•Valence
•Dow Kokam•LifeBatt•Evolve Electrics•The Battery Shop
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FLUX POWER 3.2V 40AH CELLS
• Current:• 400 A Impulse (2 sec)• 200 A Peak (10 sec)• 120 A Continuous
• Voltage:• 3.9 V Maximum• 3.2 V Nominal• 2.5 V Minimum
These batteries can handle all the necessary current requirements for our electric motor, including the momentary initial 300 A discharge.
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FLUX POWER 3.2V 40AH CELLS
• High energy density• Ideal for Electric Vehicles• Low internal impedance• 100% factory tested• Rigid plastic exterior• Operating Temperature: -45 to +85
(Celsius)• Expected >5000 cycle life at 70%
discharge
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DETERMINING BATTERY CAPACITY
As previously stated, the competition allows each vehicle to have 19.5 Mega Joules of energy onboard. We chose 40Ah cells so the electric portion of total onboard energy is around 40%, allowing us to use more gas for the IC engine.
Joules (J) = (voltage)(battery capacity)(.8)(3600)
Our System:(72 V)(40 Ah)(.8)(3600) = 8.294 MJ 8.294 MJ/19.5 MJ = 42.5% Electric
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BATTERY PERFORMANCE
• Able to hold charge well
• At a rate of 1C the batteries will last for over an hour
1C*40Ah = 40A• At a rate of 3C they will last just under 20 minutes
3C*40Ah = 120A
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CHARGER
• Delta-Q QuiQ Charger• 1kW Unit• 72V DC output• Max of 100V DC• Universal input (85-265 AC)• 12A charging current• UL compliant• Can be programmed for a wide variety of battery types
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CHARGER CONTINUED
• Uses high efficiency, high frequency switching circuit• Digital software control• Housed in fully-sealed enclosure• Can be used onboard vehicle• Safety and reliability are a major design concern
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ACCUMULATOR MONITORING SYSTEM
• Required in Formula Hybrid rules• Must be active when car is running or
charging• Automatically take action to prevent
conditions such as over charge and over temperature • Disable HV system under conditions such
as over voltage, under voltage, cell reversal, and over temperature
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AMS CONTINUED
•Must remain disabled until manually reset (reset button must not be accessible to driver)• Balancing is a mechanism to equalize state of charge or cell voltage• Bimetallic thermal switches provide over temperature protection
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BATTERY MANAGEMENT SYSTEM
Lithiumate Lite Li-Ion BMS for EV conversions
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BMS CONTINUED
Lithiumate Lite• Designed specifically for EV conversions • Distributed: cell boards mounted on cells, single
wire to adjacent cell boards • For large packs: up to 160 cells (~ 500 V), in up to 8
banks • Supports all cell form factors, and most Lithium
chemistries • Protects cells from over current, under/over voltage,
under/over temperature • Compatible with most chargers and most motor
drivers
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BMS CONTINUED
Measurement •Measures and reports the cell voltages and temperatures in up to 8 banks of cells in a battery pack •Measures and reports the battery pack current (bidirectional load current up to 900 A; charger current up to 30 A)
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BMS CONTINUED
Evaluation • Calculates and reports the State Of Charge
of the battery pack
Management • Balances the pack • Passive balancing • Voltage remains balanced for each cell
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BMS CONTINUED
Protection • Turns off charger if any cell voltage exceeds
a maximum, or the charging current is excessive • Requests a reduction of motor drive if the
battery is nearly empty • Requests that motor controller be turned off
if any cell voltage drops below a minimum, or the discharging current is excessive
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BMS CONTINUED
Protection • Disables charging and/or discharging if
any cell's temperature is outside a specified range • Disables charging and discharging if any
cell board or bank stops reporting • Prevents driving off when the vehicle is
still plugged into the AC outlet
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BMS CONTINUED
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ELECTRICAL SYSTEM OVERVIEW
• Three-Phase AC Induction Electric Motor• HPEVs AC-15
• Motor Controller• Curtis 1238R
• Handheld Programmer• Curtis 1311
• 24 3.2V LiFePO4 Battery Cells • Flux Power
• 72V Charger• Delta-Q
• Lithiumate Lite Battery Management System• Elithion
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• HPEVs AC-15 Electric Motor was ordered from Thunderstruck Motors
• This is in and ready to use
• Curtis 1238R Motor Controller and 1311 handheld programmer donated by Tennant
• These are in and ready to use
PROJECT STATUS
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• 24 3.2V LiFePO4 Cells on order from Flux Power
• These should be in and ready to use early next semester
• DeltaQ 72V charger on order from Flux Power
• This should be in and ready to use early next semester
PROJECT STATUS CONTINUED
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PROJECT STATUS CONTINUED
• Lithiumate Lite Battery Management system on order from Elithion• This should be in and ready to use early next
semester
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TASKS REMAINING
• Wait for batteries to come in• Get additional wiring etc. necessary• Get the Battery Management System working• Connect all of the main components• Get the motor running• Program the motor• Get everything onboard a test vehicle (if we do
bench testing first)• Make adjustments as necessary
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TIMELINE
TaskEstimated Date of Completion
Wait for batteries
Hopefully these will be in by the
start of the semester
Get additional wiring, etc. End of January
Finish work on BMS End of February
Connect everything up End of March
Have motor running End of April
Program motor and get everything onboard the
vehicleEnd of May
Make adjustments as necessary
Ongoing until the end of the semester
• Everything will be pushed back if batteries take longer to come (this will be beyond our control)
• It’s very difficult to estimate how long each part will take since we haven’t been able to work with the components yet
• Gave a good amount of time for each part while ensuring the project is finished
• Tasks may take more or less time
• Getting it onboard a vehicle will depend on the Mechanical Engineering team
• No tasks are split up individually since we can and will work as a team on every aspect
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UPDATED BUDGET
Part Cost per unit Quantity Total Cost Notes
Electric Motor Controller – Curtis
1238R$1,500 1 0 (Donated)
Donated by Bob Erko from Tennant
Curtis 1311 Motor Controller
Programmer$755 1 0 (Donated)
Also donated by Bob Erko from Tennant
AC Induction Motor (AC-15)
$1,350 1 $1,350Purchased from
Thunderstruck MotorsOn ME budget
Flux Power 3.2V 40Ah Cells
$54.48 24 $1,307.52Purchased direct from
Flux PowerDelta-Q 72V 1kW
Charger$382.86 1 $382.86
Also purchased from Flux Power
eLithion Lithiumate Lite
Battery Management
System
$481 1 $481Purchased through EVolveElectrics.com
Miscellaneous Wiring/Emergency Switches/Safety
~300.00 NA ~300.00We will need various
additional parts for the electrical system.
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FINANCIAL OUTLOOK
Our Senior Design budget $400
Remaining Mechanical Engineering Senior Design Team budget $1017
Donation from Phoenix International $2500
Batteries, Charger, and BMSNote: Tax and shipping not included -$2171.38
TOTAL BUDGET REMAINING $1745.62
Items still needed to be purchasedNote: This only includes electrical and the budget will be used for the whole project as
needed
~$300
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SUMMARY SLIDE
• We have made very good progress• Despite a limited budget and difficulties in
dealing with companies we have gotten all of the major components required• Batteries will be ordered and in by next semester• Won’t be in competition until next year due to
mechanical problems• Our design requirements remain unchanged• On track to finish our portion of the overall project
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IMAGE CREDIT
• http://www.oildependency.org/• http://www.newsmania.com/wp-content/uploads/2011/08/crude-oil-300x293.jpg• http://www.renewableenergyworld.com/assets/images/story/2010/7/30/1332-top-
five-electric-vehicle-developments.jpg• http://upload.wikimedia.org/wikipedia/commons/thumb/e/ed/
Toyota_Prius_III_20090710_front.JPG/250px-Toyota_Prius_III_20090710_front.JPG• http://www.ndspe.org/news/Summer3.jpg• http://www.ndsu.edu/me/sae/images/webformula.jpg• http://www.ndsu.edu/me/sae/images/Formula-Car-1.jpg• http://www.ndsu.edu/me/sae/images/Formula-Car-2.jpg• http://www.nhms.com/images/_03C4015_lg.jpg• http://kelvinslush.com/wp-content/uploads/2010/09/TheRules_Kelvin-480x296.jpg• http://www.melaniewilson.org/.a/6a00d8354abaaa53ef014e88f34393970d-800wi• http://www.toyota-global.com/innovation/environmental_technology/
technology_file/• Image from Tennant presentation
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IMAGE CREDIT CONTINUED
• http://hpevs.com/nev/ac-15• Image from Mechanical Engineering design team• http://evolveelectrics.com/PDF/AC%20Motor%20Kit/Curtis_1238_Controller.pdf• http://fluxpwr.com/products/3-2v-cell/• http://upload.wikimedia.org/wikipedia/commons/1/15/Lithium_iron_phosphateV2.png• http://fluxpwr.com/• http://fluxpwr.com/wp-content/pdf/flux_PB_cell_11_21_WEB.pdf• http://www.delta-q.com/products/images/QuiQ-dci_AC_inputcopy_000.jpg• http://www.delta-q.com/products/720-0001_Rev-5_QuiQ_Data_Sheet_compact.pdf• http://elithion.com/img/lithiumate_lite.jpg• http://elithion.com/img/lite_block_charger.jpg• http://www.nappepin.com/LithiumHawk/AC31_01.png• http://evolveelectrics.com/PDF/AC%20Motor%20Kit/Curtis_1238_Controller.pdf• http://fluxpwr.com/products/3-2v-cell/• http://www.delta-q.com/products/images/QuiQ-dci_AC_inputcopy_000.jpg• http://elithion.com/img/lithiumate_lite.jpg• http://elithion.com/img/lite_application.jpg
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QUESTIONS?