How to control the idle speed of EFI gasoline engine?

The idle speed control system of EFI system varies from manufacturer to manufacturer, but the basic structural concept is basically the same. Engine idle speed control basically includes intake air flow or pressure sensor, air temperature sensor, water temperature sensor, crankshaft or camshaft position sensor, knock sensor and so on. The collected engine working environment data are transmitted to the computer version for calculation by current or pulse signal, and the most economical fuel injection quantity supports the engine idling.