Throttle is a controllable valve that controls the air entering the engine. When the gas enters the intake pipe, it mixes with gasoline to form a combustible mixture, which can be burned to do work. It is connected to the air filter and is connected to the engine block. It is called the throat of the car engine. Throttle valve has two kinds of traditional cable and electronic throttle valve. The traditional throttle control mechanism of the engine is operated by cable (soft wire) or pull rod, one end is connected to the accelerator pedal, and the other end is connected to the throttle linkage plate. The electronic throttle mainly uses the throttle position sensor to control the opening angle of the throttle valve according to the required energy of the engine so as to adjust the magnitude of the intake air amount.

The types of electronic throttles include electro-hydraulic, linear electromagnet, stepper motor, and DC servo motors. However, electro-hydraulic and stepper motor types do not have high control accuracy, and linear electromagnets require electricity. The power consumption is relatively large, and they are rarely used in automobiles. The DC servo motor type is a good way to overcome the above two conditions, and thus it is widely used in automobiles. In addition, the throttle valve also needs to be replaced on a regular basis, and the length of time depends mainly on the quality of the air filter, the quality of the oil, and the road conditions of the vehicle.

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