بسم الله الرحمن الرحيمبسم الله الرحمن الرحيم

Project ItemsProject Items

Abstract.Abstract. Introduction.Introduction. Programmable Programmable

ECUs.ECUs. Step of ECU Step of ECU

function.function. Subsystems of Subsystems of

ECU.ECU.

AbstractAbstract

OBJECTIVES OF THE Presentation:OBJECTIVES OF THE Presentation:

To know what is the electronic control unit.To know what is the electronic control unit.

To determine the primary functions of (ECU). To determine the primary functions of (ECU).

How does the ECU work .How does the ECU work .

IntroductionIntroduction

Electronic control unit (ECU) is a Electronic control unit (ECU) is a computer which controls (for instance) computer which controls (for instance) ignition and fuel injection systems.ignition and fuel injection systems.

An electronic control unit (ECU), also An electronic control unit (ECU), also called a control unit or control module called a control unit or control module that controls one or more of the that controls one or more of the electrical subsystems in a car. electrical subsystems in a car.

Some modern cars have up to 70 Some modern cars have up to 70 ECUsECUs. .

Subsystems of ECUSubsystems of ECU

Engine Control Unit also called Power Engine Control Unit also called Power train Control Module (PCM).train Control Module (PCM).

Transmission Control Unit – TCU. Transmission Control Unit – TCU. Telephone Control Unit - TCU .Telephone Control Unit - TCU . Door Control unit .Door Control unit . ECU operation Seat Control Unit. ECU operation Seat Control Unit. Climate Control Unit .Climate Control Unit .

The steps of ECU functionThe steps of ECU function

Gathering data, sent by sensors.Gathering data, sent by sensors.

Filtering this data, This operation is handled by Filtering this data, This operation is handled by data conditioners. data conditioners.

Data processing and analysis by the ECU’s Data processing and analysis by the ECU’s digital core by Special algorithms calculate the digital core by Special algorithms calculate the commands to be sent to the control devices. commands to be sent to the control devices.

Formatting of operating commands, and Formatting of operating commands, and amplifying them if needed.amplifying them if needed.

Engine control unitEngine control unit

Is an electronic control unit which Is an electronic control unit which controls various aspects of an (ICE) controls various aspects of an (ICE) operationoperation . .

The simplest ECUs control only the The simplest ECUs control only the quantity of fuel injected into each quantity of fuel injected into each cylinder each engine cycle. cylinder each engine cycle.

More advanced ECUs found on most More advanced ECUs found on most modern cars also control the ignition modern cars also control the ignition timing, variable valve timing timing, variable valve timing (VVT).(VVT).

Electronic control units

OPERATIONS OF ENGINE OPERATIONS OF ENGINE CONTROL UNIT CONTROL UNIT

Control of fuel injectionControl of fuel injection

ECU will determine the quantity of ECU will determine the quantity of fuel to inject based on a number of fuel to inject based on a number of parameters.parameters.

The ECU will inject more fuel according to The ECU will inject more fuel according to how much air is passing into the engine how much air is passing into the engine which is controled by throttle pedal. which is controled by throttle pedal.

If the engine has not warmed up yet,the If the engine has not warmed up yet,the ECU will control the injection of fuel ECU will control the injection of fuel causing the engine to run slightly 'rich' causing the engine to run slightly 'rich' until the engine warms up (choke) .until the engine warms up (choke) .

Control of ignition timingControl of ignition timing

ECU can adjust the exact timing of ECU can adjust the exact timing of the spark (called ignition timing) to the spark (called ignition timing) to provide better power and economy. provide better power and economy.

If the ECU detects knock because the If the ECU detects knock because the ignition timing is too early in the ignition timing is too early in the compression stroke, the ECU will compression stroke, the ECU will delay the timing of the spark to delay the timing of the spark to prevent knock.prevent knock.

Control of variable valve Control of variable valve timingtiming

the ECU controls the time in the the ECU controls the time in the engine cycle at which the valves engine cycle at which the valves open.open.

The valves are usually opened later The valves are usually opened later at higher speed than at lower at higher speed than at lower speed ,This can optimize the flow of speed ,This can optimize the flow of air into the cylinder increasing air into the cylinder increasing power.power.

Programmable ECUsProgrammable ECUs

A special category of ECUs are those A special category of ECUs are those which are programmable. These units which are programmable. These units do not have a fixed behavior, but can do not have a fixed behavior, but can be reprogrammed by the user.be reprogrammed by the user.

A programmable ECU can be wired in A programmable ECU can be wired in by a laptop connected using a serial or by a laptop connected using a serial or USB cable, while the engine is running USB cable, while the engine is running to add the new configurations .to add the new configurations .

parametersparameters that can be that can be rereProgrammedProgrammed

Ignition. Revolution limit. Water temperature correction. Transient fueling. Variable cam timing. Gear control.

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