Why is the greater the throttle opening, the more mixed gas there is? How did the mixer come into being?

The greater the throttle opening of the car, the more mixed gas is introduced.

There is a throttle position sensor on the throttle to measure the opening and closing angle of the throttle. It tells the computer that the larger the throttle opening, the more air intake of the engine and the less air intake, regardless of the volume.

Reasons for mixing gases:

Air and atomized gasoline form a mixture. During the whole intake process when the engine is working, the throttle valve leading to the cylinder is always lower than atmospheric pressure. The larger the throttle opening is, the more combustible mixture with the so-called optimal air-fuel ratio will enter in the specified time, that is to say, the smaller the vacuum degree is, the closer it is to atmospheric pressure, and the air-fuel ratio has nothing to do with it (but the throttle opening is not proportional to the air intake of combustible mixture, which is also the purpose of turbocharging).