What is the structure of the electronic control unit?

The electronic control unit is mainly composed of input circuit, analog-to-digital converter (A/D converter), microcomputer and output circuit. Input circuit: When the engine is working, the signals of various sensors will first enter the input circuit for processing after being input into the ECU. Analog-to-digital converter: There are two kinds of signals sent by sensors to ECU, one is digital signal (such as Carmen vortex street air flowmeter signal, speed signal, etc. ) and analog signals (such as blade air flowmeter signal, air temperature sensor signal, throttle position sensor signal, etc. ).). Digital signals can be directly input into the microcomputer, but the microcomputer cannot directly receive analog signals. Microcomputer: Microcomputer is the nerve center of control system, and its function is to use stored programs and data. According to the working requirements, the signals from various sensors are calculated and processed, and the processing results are sent to the output circuit. Microcomputer is mainly composed of CPU, memory and input and output devices. Output circuit: The main function of the output circuit is to amplify the processing results of the microcomputer and generate control signals.