Camshaft Position Sensor: Description and Operation

GF07.04-P-6020V Component Description For A Camshaft Hall Sensor







Location
The camshaft Hall sensors are located before the respective camshaft.

Task
Detects the camshaft position for the following functions contactlessly via the pulse wheel at the front at every camshaft:
- Camshaft adjustment
- Synchronization of the ignition and injection sequence (recognition of ignition TDC).

Design
Hall sensor in plastic housing with 3-pole plug connection, distance from pulse wheel of 0.2 to 1.8 mm.

Function
The camshaft positions are detected by the camshaft Hall sensor, which detects the position of the pulse wheels at the front on the camshafts. The camshaft position can already be detected when the engine is stationary by the electronics for the Hall sensor. This results in an improvement in the exhaust levels because the optimal injected quantity of fuel can be assigned to each cylinder immediately when the engine is started (quick-start function).

Four signals are generated per rotation of the camshaft whereby the signal switches between about 5 V ("HIGH") and 0 volt ("LOW"). If an opening in the pulse wheel is opposite the sensor, the signal is approx. 5 V.

The signals are used to control and diagnose the camshaft adjustment, to synchronize the crankshaft and camshaft position (detection of ignition TDC cylinder 1) and for emergency starting of the engine when the crankshaft Hall sensor is faulty.







The stated angle at the pulse wheels must be doubled to maintain the crank angle.