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104 ELECTRIC/ELECTRONIC SYSTEM D AILY E URO 4 The solenoid valve controls the lift of the atomiser needle. On the fuel inlet union a filter protects the injector for Access to the injectors is gained by releasing the side The injector comprises two parts: - actuator - atomiser composed of pressure rod (1), pin (2) and nozzle (3) - control solenoid valve comprising a coil (4) and drive valve (5). 1 st phase: rest position The coil (4) is not activated and the shutter (6) is in the closed The same fuel pressure acts in both the control area (7) and 2 nd phase: start of injection The coil (4) is energised and causes the shutter (6) to move The fuel of the control volume (9) flows towards the backflow At the same time, the pressure of the fuel in the pressure 3 rd phase: end of injection The coil (4) is not activated and makes the shutter (6) return Injectors (78247) The injectors are connected individually to the control unit at - A16 / A47 cylinder 1 injector - A2 / A31 cylinder 2 injector - A1 / A46 cylinder 3 injector - A17 / A33 cylinder 4 injector INJECTOR WIRING DIAGRAM AND CROSS SECTION 1. Pressure rod - 2. Needle - 3. Nozzle - 4. Coil - 5. Pilot valve - 6. ball shutter - 7. control area - 8. pressure 11. Control duct - 12. Supply duct - 13. Electrical connection - 14. High pressure fuel inlet - 15. Spring 10 4 5 6 7 12 13 9 11 14 12 1 15 2 8 3 Figure 93 |