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<!---->Position sensor, high pressure pump
Position sensor, high pressure pump
The high pressure pump for fuel injection is driven via the extended drive of the mechanical vacuum pump. The vacuum pump is driven via the timing chain from the crankshaft.
The new generation high pressure pumps are monitored by a position sensor. The crankshaft speed is sensed in the process.
The position sensor for the high pressure pump is mounted on the vacuum pump housing.
Functional description
The position sensor senses the position of the high pressure pump with the aid of an increment wheel bolted to the vacuum pump drive. The engine management system uses this to calculate the pump speed. Speed sensing is required to control the fuel quantity from the high pressure pump.
The position sensor for the high pressure pump essentially functions like a camshaft sensor.
The output signal from the sensor, which is transmitted to the DME, is a square wave signal. Here an electrical high level corresponds to a gap and an electrical low level to a tooth.