Is Chai Weirui's power throttle normally open or normally closed at idle speed?

Always open. The throttle is what we often call the "throttle". Its function is to control the amount of mixed gas entering the cylinder. It is installed in the appropriate position of the intake manifold and connected with the accelerator pedal with a metal wire. When driving, the driver's "refueling" or "draining" is actually changing the throttle opening (changing the amount of mixed gas entering the cylinder) to accelerate or decelerate the car.

It should be pointed out that gasoline engines have both valves and throttles, while diesel engines have only valves and no throttles. The change of the accelerator pedal of diesel vehicle can accelerate or decelerate the vehicle by controlling the injection quantity of high-pressure oil pump.