General Description of Engine Managerial System
Engine managerial system,which is mainly made up of the sensor,ECU and the actuator,controls the intake air amount,oil injection amount and ignition advance angle when the engine works.The basic structure is shown in Fig.4.1.
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Fig.4.1 Schematic Diagram of Engine Managerial System Composition
In the engine managerial system,the sensor,as the input part,is used to measure all kinds of physical signals(such as temperature and pressure)and transfer them into the corresponding electric signals;ECU is to receive the input signal of the sensor and make calculation processing according to the established program so as to produce the corresponding control signals output to the power driving circuit,which makes the engine operate in accordance with the fixed control strategy by driving various actuators to do different actions;at the same time,fault diagnostic system of ECU will monitor the components of the system or control function and if any fault is detected and confirmed,store the fault code and start the function of“Limp Home”.When the fault is eliminated,recover the normal value to use.