The ECU Control of Diesel Engine Based on CAN

The dynamic, comfort and emission performances of vehicle directly dependent on the control of engine. Engine electronic control unit (ECU) receives the signals from the sensors, and gets the current engine status. Then depending on the signals, the ECU calculates fuel injection rate, injection timing and quantity. Accordingly the actuators which are driven by ECU carry out the better fuel control. Whether the vehicle could work efficiently and reliably almost dependents on the engine ECU is normal or not. One way to test engine ECU is using load box which can diagnose and calibrate the faults. This paper chooses CAN bus to realize the communication between ECU and load box because of its widely using and well function. This paper formulates the CAN bus communication protocol which meets the needs of load box test, and designs the CAN communication module and signal input /output module. MPC5633 made by Free scale is used as the micro controller unit (MCU) in ECU. Through the experiments showed in paper proves the testing programs of ECU control can realize the function requirements.