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The English abbreviation of the throttle position sensor is TPS (Throttle Position Sensor). Also known as the throttle opening sensor or throttle switch. Its main function is to detect whether the engine is in an idle condition or a load condition, whether it is an acceleration condition or a deceleration condition. It's essentially a variable resistor and a few switches mounted on the throttle body.

The shaft of the resistor is linked to the throttle valve, and it has two contacts: full open contact and idle contact. When the throttle is at the idle position, the idle contact is closed, and the idle condition signal is output to the computer; when the throttle is at other positions, the idle contact is opened, and the voltage signal corresponding to the different rotation angles of the throttle is output, and the computer then according to the signal The voltage value identifies the load on the engine.

According to the increase and decrease rate of the signal voltage within a certain period of time, it is identified whether it is an acceleration condition or a deceleration condition. The computer corrects the fuel injection amount or performs fuel cut-off control according to the working condition information.