What is the use of variable intake and exhaust valve timing and electronic throttle control technology?

The function of variable intake and exhaust valve timing and electronic throttle control technology;

1: Variable intake and exhaust valve timing is a system that uses computer to control the opening and closing time of intake and exhaust valves. Its main function is to improve air intake efficiency;

2. When the engine is running at low speed, high speed and low load, there are different requirements for the opening and closing time of the intake and exhaust valves. For example, when the engine is running at high speed, after the piston runs to the bottom dead center, the air has not filled the cylinder due to the running resistance. At this time, it is necessary to close the intake valve as late as possible to improve the inflation coefficient. However, the valve timing of the traditional engine is fixed, that is, the angle of the camshaft relative to the crankshaft is fixed. It is impossible to realize the variable timing of the intake valve and the exhaust valve. The variable timing system allows a certain degree of freedom between the transmission gear of the camshaft and the camshaft. This degree of freedom is determined by the computer by detecting the running state of the engine, so that the valve timing can be changed.

3. The electronic throttle cancels the throttle line, and the computer detects the position signal of the accelerator pedal and refers to other signals (such as water temperature and vehicle speed). ) to comprehensively determine the best position of the throttle, which is executed by the throttle control motor, so as to achieve the best control. In addition, in a vehicle equipped with a cruise system, a cruise control program can be added to a computer, thereby simplifying the structure. There are other advantages, such as more accurate idle speed control.