Volkswagen 1.9 tdi, Руководство пользователя, Страница: 47 / 67

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Engine Management
Actuators
Pump/Injector Solenoid Valves
The 1.9-liter TDI engine with the new pump
injection system uses four pump/injector
solenoid valves:
• Valve for Pump/Injector, Cylinder 1 N240
• Valve for Pump/Injector, Cylinder 2 N241
• Valve for Pump/Injector, Cylinder 3 N242
• Valve for Pump/Injector, Cylinder 4 N243
The pump/injector solenoid valves are
attached to their pump/injectors with a
cap nut.
The Diesel Direct Fuel Injection Engine
Control Module J248 regulates the start of
injection points and injection quantities of
the pump/injectors by activating their
solenoid valves at the appropriate times.
Start of injection point
As soon as the Diesel Direct Fuel Injection
Engine Control Module J248 activates a
pump/injector solenoid valve, the magnetic
coil presses the solenoid valve needle
down into the valve seat and closes off the
path from the fuel supply line to the high-
pressure chamber of the pump/injector.
The injection cycle then begins.
Injection quantity
The injection quantity is determined by the
length of time that the solenoid valve is
activated.
Fuel is injected into the combustion
chamber as long as the pump/injector
solenoid valve is closed.
SSP209/064