How to control the air intake when idling?

Generally speaking, the control methods of idle intake can be divided into two types: direct throttle and bypass.

Throttle direct-acting type is to control the opening of throttle through motor, and then control the air intake at idle speed. The larger the throttle opening, the more air intake, and vice versa.

Introduction:

Idle working condition is the state that the engine runs at the lowest stable speed without doing work. At this time, the engine is completely separated from the transmission system, and its purpose is to maintain the continuous and stable operation of the engine at low speed, and provide working power for other auxiliary devices, such as air conditioners and power steering devices, so that the engine speed can run stably within a certain speed range. Idle working condition is one of the important working conditions of the engine.

There are two main factors that affect the idling performance of the engine. One is to control the mixture and air to flow into the cylinder. Because the flow of mixed gas directly affects the combustion speed, pressure and temperature of mixed gas in the combustion chamber, it has great influence on the engine power, fuel economy and the composition of exhaust pollutants. On the other hand, it is the time when the combustible mixture in the cylinder is ignited. Different ignition timing will also have a great influence on the combustion process in the cylinder, thus affecting the dynamic performance of the engine.