PassatB51.8T, 2.8L, POLO, etc. ShanghaipublicThe new model uses electronicsThrottle, Also known as electronic throttle (E-Gas).The advantage of the electronic throttle is that it overcomes the limitation that the engine control system can only control idle speed and cruise control when the mechanical throttle is used. Instead, it controls the full operating conditions of the engine, which means that the driver stepped on it. Accelerator pedal, the control system cannot control the section according to the received torque signalValveFor power matching, this situation has been changed after the electronic throttle is used. Since the throttle is driven by only one motor, the driver’s accelerator pedal is only used to provide the control system with information on the pedal position. The control system refers to this signal, and according to each The requirements of various operating conditions include fuel economy, emissions, etc., after calculations are performed to determine the opening position of the throttle valve. This enables precise power matching.Therefore, the electronic throttle is completely different from the original mechanical throttle.Ignition SwitchThe throttle opening is different when you step on the accelerator pedal and when the engine is running.Turn on the ignitionswitchWhen you step on the accelerator, the throttle will open as the pedal is gradually depressed; during operation, the throttle opening does not change with the depression of the accelerator pedal, but is controlled by the control system. It is possible that you may depress the accelerator pedal. Not much, but because the power matching demand throttle is fully open, which is consistent with the introduction at the beginning, so don't think it is a malfunction. The engine control system is mainly based on changing the thr
PassatB51.8T, 2.8L, POLO, etc. ShanghaipublicThe new model uses electronicsThrottle, Also known as electronic throttle (E-Gas).The advantage of the electronic throttle is that it overcomes the limitation that the engine control system can only control idle speed and cruise control when the mechanical throttle is used. Instead, it controls the full operating conditions of the engine, which means that the driver stepped on it. Accelerator pedal, the control system cannot control the section according to the received torque signalValveFor power matching, this situation has been changed after the electronic throttle is used. Since the throttle is driven by only one motor, the driver’s accelerator pedal is only used to provide the control system with information on the pedal position. The control system refers to this signal, and according to each The requirements of various operating conditions include fuel economy, emissions, etc., after calculations are performed to determine the opening position of the throttle valve. This enables precise power matching.Therefore, the electronic throttle is completely different from the original mechanical throttle.Ignition SwitchThe throttle opening is different when you step on the accelerator pedal and when the engine is running.Turn on the ignitionswitchWhen you step on the accelerator, the throttle will open as the pedal is gradually depressed; during operation, the throttle opening does not change with the depression of the accelerator pedal, but is controlled by the control system. It is possible that you may depress the accelerator pedal. Not much, but because the power matching demand throttle is fully open, which is consistent with the introduction at the beginning, so don't think it is a malfunction. The engine control system is mainly based on changing the throttle position, fuel injection time, ignition advance angle to match the three-way catalytic preheating, idle speed, emission control, speed limit, power limit, automatic transmission shift point,Braking System(Traction control, engine braking), air conditioning, cruise control and other changes in torque.
one. System composition and function of electronic throttle:
1) With accelerator pedal positionsensorThe accelerator pedal module ---- Determine the pedal position and transmit the pedal position signal to the control unit.
2) Engine control unit-receiving pedalsensorSignal, calculate the required power, and calculate the actual throttle opening according to other torque signals such as sudden acceleration, air conditioning, and automatic transmission vehicle starting, and control the throttle motor to adjust the opening. It also monitors the throttle system.
3) Throttle control unit---controls the required air volume, adjusts the throttle opening according to the signal provided by the control system, and feeds back the throttle position signal.
4) Throttle failure light (EPC light, on the instrument) --- prompts the driver of throttle failure information.
5) Sensors and actuators
Sensors: accelerator pedal module with accelerator pedal sensor G79, G185, throttle controller J338 with throttle angle sensor G187, G188;Clutch pedalSwitch F36,Brake pedalSwitch F47, brake light switch F.
Actuator: J338 with throttle valve drive G186, throttle valve fault light K132.
two.Function and fault description of each component
1. Accelerator pedal sensor G79, G185: sliding rheostat type; the control system determines the pedal position according to two signals. The two signal values are just the opposite, that is, one from small to large, and the other vice versa, forming a contrast.
1) When a sensor is broken and the system detects that there is a throttle signal, it can enter idle speed, but the throttle should be fully opened very slowly; the system also judges the idle speed through the brake light switch and brake pedal switch signals. Cruise, etc. are closed. The EPC light is on, and there is a fault in the fault memory.
2) When both sensors are broken, the engine runs at about 1500rpm, and there is no response when stepping on the accelerator pedal. The EPC light is on, and there is a fault storage.
2. Throttle angle sensor G187, G188: sliding rheostat type. The throttle position signal is fed back to the system. Two sensors are installed for accuracy and backup. When a sensor is broken. The system uses another sensor signal, the response to the accelerator pedal remains unchanged, and the cruise is turned off. The EPC light is on, and there is a fault in the fault memory. When the two signals are interrupted, the engine runs at about 1500rpm, and there is no response when stepping on the accelerator pedal. The EPC light is on, and there is a fault storage.
3.clutchPedal switch F36: switch signal, feedback the clutch pedal position, when the pedal is depressed, the load change function is turned off. The system does not monitor it, so there is no fault storage and no substitute value.
4. Brake pedal switch F47 and brake light switch F: switch signal. The brake pedal position signal is fed back. After the control unit receives the pedal depressing signal, the cruise will be turned off; if the accelerator pedal sensor is broken, it will be used as a substitute for the idle speed signal.
If it is faulty, the system will run at high idle speed, and there will be no response when stepping on the accelerator pedal. The EPC light is on, and there is a fault in the fault memory.
5. Throttle drive device J186: positioning motor. Receive system commands and control throttle opening. After a fault occurs, it enters the emergency operation mode, the throttle is opened to a certain angle by the spring, the system runs at high idle speed, and there is no response when stepping on the accelerator. The EPC light is on, and there is a fault in the fault memory.
6. EPC fault light K132: Prompt signal. When the system is normal, turn on the ignition switch for 3 seconds and then go out after self-test. If there is a fault, it will always be on. There is no impact on the system after the failure, and the failure is stored.
