ECU is the same as ordinary single-chip microcomputer, which is composed of microprocessor, memory, input/output interface, analog-to-digital converter, shaping, driving and other integrated circuits. The role of the ECU is to calculate the driving conditions of the vehicle through various sensors, so as to control the engine’s ignition, air-fuel ratio, idle speed, exhaust gas recirculation and other parameters. The working temperature is -40-80 degrees, and it can also withstand large vibrations, so the probability of ECU damage is very small. In addition, ECU also has fault self-diagnosis and protection functions. When the system fails, it can also automatically record the fault code in the memory and use protective measures to read the replacement program from the above-mentioned inherent program to maintain the running of the engine, so that the car Can drive to the repair shop. How does ECU work? Simply put, it is a general’s command process: “thinking”, “commanding”, and finally “confirming”. The “reconnaissance” is done by the sensor, and the sensor is responsible for the “reconnaissance” of the entire engine. On an engine, there are dozens of large and small sensors.