Direct Petrol Injection System with Bosch Motronic MED 7 - Volkspage

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Engine management Electronic accelerator The electronic accelerator is a basic requirement for direct petrol injection. It helps to adjust the throttle valve regardless of accelerator pedal position. It is opened wider in stratified charge mode and homogeneous lean charge mode. This has the advantage of almost throttle-free engine operation. The engine is able to draw in air against less resistance, reducing fuel consumption. <strong>Motronic</strong> control unit J220 Accelerator position sender G79 Accelerator pedal position sender -2- G185 Throttle valve control unit J338 Throttle valve drive G186 Throttle valve control unit J338, Angle senders 1+2 G187, G188 Control unit <strong>with</strong> display in dash panel insert J285 Electronic power control fault lamp K132 Additional input signals 253_035 22
This is how it works The driver input is identified by the accelerator position sender (G79, G185) and sent to the engine control unit. The engine control unit uses this signal and other additional signals to calculate how much engine torque is required and uses the actuators to generate this torque. Accelerator pedal position Torque 253_034 Stratified charge mode Throttle valve fully open Homogeneous lean charge mode Homogeneous charge mode Throttle valve closed Torque 253_034 In stratified charge mode, engine torque is determined by the fuel quantity. The throttle valve is opened almost fully, apart from the necessary flow restrictions for the activated charcoal canister system, exhaust gas recirculation and possibly the brake vacuum control system. In homogeneous lean charge mode and homogeneous charge mode, engine torque is determined by the ignition advance angle and by the intake air mass. The throttle valve is opened as far as is necessary to produce the required amount of engine torque. 23
Page 1 and 2: Service. Self-Study Programme 253 D
Page 3 and 4: Table of Contents Introduction . .
Page 5 and 6: Why has Volkswagen waited until now
Page 7 and 8: Homogeneous operation at high exhau
Page 9 and 10: Combustion process The term "combus
Page 11 and 12: Injection cycle Fuel is injected du
Page 13 and 14: Homogeneous lean charge mode This i
Page 15 and 16: Mixture formation process By inject
Page 17 and 18: Motronic control unit J220 Fuel pum
Page 19 and 20: Torque-based engine management syst
Page 21: Intake system In comparison with th
Page 25 and 26: Intake manifold flap actuated In st
Page 27 and 28: Air-mass flow meter G70 and intake
Page 29 and 30: This is how the exhaust gas recircu
Page 31 and 32: Fuel system The fuel system is divi
Page 33 and 34: This is how it works The fuel flows
Page 35 and 36: The fuel pressure regulating valve
Page 37 and 38: This is how it works Inlet with fin
Page 39 and 40: Activated charcoal canister system
Page 41 and 42: Exhaust system This was adapted to
Page 43 and 44: Broadband lambda probe (G39) The br
Page 45 and 46: Exhaust gas temperature sender (G23
Page 47 and 48: NOx sensor control unit (J583) This
Page 49 and 50: Function of the NOx sender The func
Page 51 and 52: Sulphur regeneration is a technical
Page 53 and 54: Variable valve timing Inner exhaust
Page 55 and 56: Positive terminal GND Input signal
Page 57 and 58: Notes 57 Solutions to questions on
Page 59 and 60: 5. What is the signal from the inta

Direct Petrol Injection System with Bosch Motronic MED 7 - Volkspage

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