First of all, I'll teach you what ECU is, which is the abbreviation of electronic control unit (ECU). The function of the electronic control unit is to calculate, process and judge the information input by the air flowmeter and various sensors according to the programs and data in its memory, and then output instructions to provide the fuel injector with electric pulse signals with a certain width to control the fuel injection quantity. The electronic control unit consists of a microcomputer, input, output and control circuits.

ECU (Electronic Control Unit), also known as "trip computer" and "vehicle computer". In terms of use, it is a special microcomputer controller for automobiles, also called a special single chip microcomputer for automobiles. It consists of microprocessor (CPU), memory (ROM, RAM), input/output interface (I/O), analog-to-digital converter (A/D) and large-scale integrated circuits such as shaping and driving, just like an ordinary single chip microcomputer.

Generally, the voltage working range of ECU is 6.5- 16V (with voltage stabilizing devices at internal key points), the working current is 0.0 15-0. 1A, and the working temperature is 40-80 degrees below zero. It can withstand the vibration below 1000Hz, so the probability of ECU damage is very small. CPU is the core part of ECU, which has the functions of calculation and control. When the engine is running, the signals of various sensors are collected and calculated, and the calculation results are converted into control signals to control the work of the controlled object. It also controls memory (ROM, RAM), input/output interface (I/O) and other external circuits. The program stored in ROM is based on accurate calculation and a lot of experimental data. This inherent program is constantly compared and calculated with the signals collected from various sensors when the engine is working. The results of comparison and calculation control the engine ignition, air-fuel ratio, idle speed, exhaust gas recirculation and other parameters. It also has the function of fault self-diagnosis and protection. When the system fails, the fault code can be automatically recorded in RAM, and protective measures can be taken to read the replacement program from the above-mentioned inherent program, so as to maintain the operation of the engine and enable the car to drive to the repair shop. Under normal circumstances, RAM will continuously record your driving data and become a learning program of ECU, providing the best control state to adapt to your driving habits. This program is also called adaptive program. But because it is stored in RAM, just like an error code, once the battery is removed and the power supply is lost, all the data will be lost, so the brush can improve the horsepower in a sense.

The electronic control unit in the gasoline injection system is the most important electronic device in the engine fuel supply system. Its function is to collect signals or information of the engine under various working conditions through various sensors and convert them into pulse signals (digital signals). These signals are used to determine the fuel injection quantity and start fuel injection time of the engine under different loads, road slopes and temperatures, and to control the fuel injection quantity of the injector. ... so this is the answer to your second question. To sum up, you can get the third answer!