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Engine management system is mainly composed of sensor、electronic control unit(ECU) and actuator three parts. It controls the basic air intake volume、fuel inject volume and ignition advance angle when then engine is running. The A5 automobile apply the ME7.9.7 electric control system, the constitution is shown as figure 9-2: 9-2 ME7.9.7 Electric Control System Constitution Figure Air intake pressure temp erature sensor Carbon canister Thr ottle valv e Accelarate pedal position sensor Electric fuel pump Crankshaft position se nsor Coolant tempe- Rear o xygen se nsor Front catalyst Front oxygen senso r Spark plug Fuel distribution Phase sensor Mai n catalyst 1 4 |