Contact switch type throttle position sensor

( A ) structural features contact switch type TPS Throttle Position Sensor type contact switch (TPS) mainly by the throttle shaft , heavy duty contacts [ also known as power contacts (PSW)], cams, idle contact (IDL ) and wiring socket components. The cam follower throttle shaft , the throttle shaft with the rotation of the throttle opening degree size . ( 2 ) contact switch type TPS output characteristics of the contact switch type throttle position sensor output characteristic shown in Figure 2-34 . When the throttle is closed , idle contact is closed , the power contacts (PSW) is disconnected, idle contact output terminal of the signal is low , " 0" , the power contacts (PSW) output terminal of the signal is high Ping "l". ECU receives two input signals TPS , if the vehicle speed Engine Temperature Sensors input signal indicates the ECU speed is zero , then the ECU determines the engine is idling and increased fuel injector fuel injection quantity control to ensure stable engine idle speed without stalling . If at this time the ECU speed Crank Shaft Position Sensor input signal indicates the speed is not zero , then the ECU determines the engine is decelerating state and control fuel injection is stopped to reduce emissions and improve economy . When the throttle opening increases , the cam shaft with the throttle open and the top contact idle , power contacts (PSW) is left open , IDL terminal outputs HIGH "1", PSW pin output is also high level "1 ." Two high-level ECU receives the signal, it is determined that the engine is part of the load state where the ECU based on the crankshaft sensor signal and the air flow speed signal calculated and determined amount of fuel injection , the engine main guarantee economy and emissions performance. When nearly all of the throttle opening ( 80% load) , the cam rotation of the power contacts (PSW) is closed , PSW terminal outputs low level "0", IDL kept open and the output terminals of the high level "1 ." ECU receives the two signals, it is determined that the engine running at high load condition , thereby controlling the fuel injector to increase fuel injection quantity, to ensure sufficient engine output power , it will be called the power contacts contact a large load . When full throttle , ECU will control the system into open-loop control mode, then do not use the oxygen sensor signal. If the car air conditioner is working at this time , then the ECU will interrupt the air conditioner main relay signal for approximately 15s, to cut off the electromagnetic clutch coil current conditioner , the air conditioning compressor is stopped, increasing the engine output power, increase the power of the car .