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144 ELECTRIC/ELECTRONIC SYSTEM D AILY Base - May 2004 This is located on the high pressure pump and modulates the fuel pressure to the rail (and thus to the injectors) on the basis of the commands received from the electronic control unit. depends only on the spring preload. When, after processing the various engine operating parameters, the electronic control unit determines the need for a different injection pressure, it modulates a command signal in PWM to the regulator solenoid valve which discharges the excess pressure in the pump backflow duct. sensor on the rail by the control unit, which, if necessary, suitably modifies the intensity of the command signal to reach the required result. and 20 of connector A of the control unit. PRESSURE REGULATOR CROSS SECTION 1. Ball shutter - 2. Ppin - 3. Valve - 4. Preloading spring - 5. Coil - 6. Body - 7. Anchor 3 2 5 4 7 6 1 Figure 150 |