Chery A21 2005, Service Manual, Page: 331 / 475

CHERY
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A21 SERVICE MANUAL ENGINE EFI SYSTEM
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ME7.9.7 engine management system is an electronic gasoline control system, and it can
provide lots of control characters about operator and vehicle or equipment. The system adopts
a combination method of open loop and closed loop (feed back) control to provide all kinds
of control signal to engine. The main function of the system:
1) The basic functions of applying physics mode engine
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For the system structure based on torque, the airflow sensor will confirm the loading
of cylinder and improve the mixture air control function closed loop control.
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Fuel injects ignition timing on the order of cylinder order, including knock control
and emission control functions.
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3 way catalytic convert heating
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Canister control
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Idle speed control
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Limping home
2.2
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CONTROL SIGNAL: ME7.9.7 SYSTEM INPUT/OUTPUT SIGNAL
The main sensor input signal of ECU of ME7 system:
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Air flow signal
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Throttle valve corner signal
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Coolant temperature signal
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Engine speed signal
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Phase signal
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Knock sensor signal
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Oxygen sensor signal
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Speed signal
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Air conditioner pressure signal
The above information after the transaction of ECU, there will generate required actuator
control signal, and this signal will be magnified in output driving circuit and was transferred
to its corresponding actuator. The signals include below information:
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Injection timing and injection continuous time
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Fuel pump relay
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Opening degree of canister control valve
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Ignition coil closing angle and ignition angle of advance
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Air conditioner compressor relay
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