What is the function of the throttle? How to use the throttle?

1, when it comes to engine internal parts, I believe everyone will think of automobile pistons. But the throttle mentioned today may have been forgotten by many friends, and even its function is unknown.

2. Throttle is a controllable valve, which is used to control air to enter the engine, which can be said to be the "throat" of the engine.

3. After the air enters the intake pipe through the throttle, it will be mixed with gasoline and become a combustible mixture, thus playing the role of combustion and work. Then, when we step on/release the accelerator pedal deeply, the system will control the opening of the throttle valve, thus determining the intake air volume of the mixture (affecting the size and fit of the engine power).