Direct Petrol Injection System with Bosch Motronic MED 7 - Volkspage

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The primary objective of engine development is to minimise fuel consumption and exhaust emissions. A closed-loop catalyst reduces emission of hydrocarbons, nitrogen oxides and carbon monoxide by up to 99%. However, the emission of carbon dioxide (CO 2 ), a greenhouse gas produced by combustion, can only be reduced by lowering fuel consumption. But this is hardly feasible in systems with external mixture formation (intake manifold injection systems). This is why engines equipped with the Bosch Motronic MED 7 direct petrol injection system will be used for the first time in the Lupo FSI and Golf FSI. They have the potential to reduce fuel consumption by up to 15% compared to a similar engine with intake manifold injection. 253_135 In this Self-Study Programme we will show you the component parts of the direct petrol injection system together with the Bosch Motronic MED 7 used in the Lupo FSI and Golf FSI. NEW Important Note 2 This Self-Study Programme explains the design and function of new developments. The contents will not be updated. Please refer to the relevant Service Literature for up-to-date inspection, adjustment and repair instructions.
Table of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Engine management. . . . . . . . . . . . . . . . . . . . . . . . . . . 16 System overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Engine control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Intake system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 Fuel system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Ignition system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Exhaust system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Function diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Test your knowledge . . . . . . . . . . . . . . . . . . . . . . . . . 58 3
Page 1: Service. Self-Study Programme 253 D
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 and 22: Intake system In comparison with th
Page 23 and 24: This is how it works The driver inp
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
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Direct Petrol Injection System with Bosch Motronic MED 7 - Volkspage

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