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279 - 2.0 110 kW Engine with Gasolina Direct Injection - Volkspage

279 - 2.0 110 kW Engine with Gasolina Direct Injection - Volkspage

Fuel rail The rail is

Fuel rail The rail is designed to distribute a defined fuel pressure to the high-pressure injectors and to provide an adequate volume for pressure pulsation compensation. It functions as a high-pressure accumulator and acts as a mount for injectors, fuel pressure sender, pressure limiting valve and high/low-pressure connections. Inlet Return Fuel pressure sender High-pressure pump Pressure limiting valve 279_041 Intake-manifold flap motor Intake-manifold flap Fuel inlet for injectors 279_064 29

Engine sub-systems Fuel pressure sender -G247 Within the overall system, the function of the fuel pressure sender is to measure the fuel pressure in the rail. The pressure applied is relayed to the engine control unit as a voltage quantity and used for fuel pressure control. The evaluation electronics integrated into the sender are supplied with 5 V. With increasing pressure, the resistance drops and signal voltage rises. Housing Connector ASIC Contact link Spacer PC board Sender element Pressure connection 279_042 The pressure sender characteristic curve illustrated shows signal output voltage [V] as a function of pressure [MPa]. Output voltage 5,00 V 4,75 V 4,65 V 4,50 V Sender defective Maximum pressure 0,50 V 0,30 V 0,25 V Minimum pressure Sender defective 140 bar Pressur 279_043 30

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