With the continuous improvement of people's living standards, vehicles are replaced by cars, which is more common. People often travel by car, and almost every household has its own car. So it is convenient for people to travel by car. But many people don't know much about cars, just like the automobile ECU I want to introduce to you today. What does this mean? How much do you know? What does automobile ecu mean: cu (electronic control unit) electronic control unit, also known as driving computer, vehicle computer, etc. In terms of use, it is a special microcomputer controller for automobiles. Like an ordinary computer, it consists of a microprocessor (CPU), a memory (ROM, RAM), an input/output interface (I/O), an analog-to-digital converter (A/D) and a large-scale integrated circuit such as shaping and driving. In a word, ECU is the brain of a car. What is the modification of ECU? Modifying ECU is to change the engine operation by changing the troubleshooting skills (original ECU program). The so-called ECU program is actually a set of algorithms. The signals stored in the memory and converted by the input devices are processed by the controller to generate corresponding command signals, which are transmitted by the output devices. So when we modify the ECU parameters, we actually modify the algorithm. However, at this time, a problem appeared. When the input signal exceeds the default normal value in ECU (too much or too little), not only the adjustment is invalid, but also the fault signal lamp is more likely to light up. What we can do at this time is to make this signal not exceed the normal value; Or simply give up the original rules, but do not need the original computer; Or cunningly use another computer to implement your algorithm, and at the same time let it cheat the original ECU. How to modify ECU? Here are three ways to modify ECU. The modification of ECU is just a general statement, which can be divided into directly changing the hardware of ECU arithmetic unit and changing the internal program. There are three ways to cheat. 1. replacement type: directly replace the hardware of ECU arithmetic unit, which is what we often see in the circuit. Using full-replacement ECU to control engines, such as Motec, Haltech and other brands, are well-known full-replacement computers. This modification is usually used in conjunction with the hardware modification of heavy engine, because the working temperature, air intake, fuel injection and compression ratio of the modified engine greatly exceed the original set range. That is to say, after the engine is modified, the original ECU can not fully meet the hardware requirements. When changing a computer, you don't have to consider the limitation of the original data, and all the data can be set by technicians at will. Although the height of the replacement computer is adjustable, it only starts from scratch because there is no fixed form and specification. The requirements for technicians are very high. As for how difficult it is, it is not unusual to adjust the idle speed for a day or two after the vehicle starts normally, so this kind of computer replacement is mostly used in professional teams, regardless of the cost. This is the end of today's car repair series. The above is the significance of automobile ecu. Most people don't know much about cars, because many people only know how to drive. There is also a convenient repair shop when you meet. So I hope that the above introduction to the car repair series can help you. Want to know more, pay attention to the car repair series.