What kind of sensor is this on the accelerator of a car?

This is the throttle potentiometer 1 signal and the throttle potentiometer 2 signal. When the key door is open (not on fire), the voltage of potentiometer 1 signal is about 4.5 volts, and the voltage of potentiometer 2 is about 0.45 volts. When the accelerator pedal is fully depressed, the signal voltage of potentiometer 1 is about 0.45v, while the signal voltage of potentiometer 2 becomes 4.5v.. These two voltage signals are exactly the process of inversion. An increase, a decrease and an increase.