The application of BCM (Body Control Module) electronic control unit in automobiles is increasing, and the data communication between various electronic devices is also increasing. At the same time, the widespread use of these independent modules has brought about problems such as increased cost, high failure rate and complicated wiring, and at the same time improved the comfort of the car. Therefore, it is necessary to design a powerful control module to realize these discrete controller functions and control many electrical appliances, namely BCM.

ECU (electronic control unit) is also called "trip computer" and "vehicle computer". In terms of application, it is a microcomputer controller for automobiles, also known as a single chip microcomputer for automobiles. It consists of microprocessor (CPU), memory (ROM, RAM), input/output interface (I/O), analog-to-digital converter (A/D), shaping, driving and other large integrated circuits.

The function of the electronic control unit is to calculate, process and input the information of the judge's air flowmeter and various sensors according to the programs and data in its memory, and then output instructions to provide electric pulse signals with a certain width to control the fuel injection quantity of the injector. The electronic control unit consists of a microcomputer, input, output and control circuits.