Scheme of operation of the intake valve position sensor:
8 - valve position sensor;
19 - camshaft;
22 - sensor target;
e is the angle of the intermediate position of the camshaft.
Target (22) with permanent magnet mounted on the end of the camshaft (19). Valve Position Sensor (8) transmits two signals under the influence of the magnetic field of the target. The first signal determines the angle value «e», ranging from 0°to 180°, the second signal is an acknowledgment indicating an angle from 180°to 0°.
The engine control unit uses information about the intermediate angle of the camshaft (19) to determine the amount of lift inlet valves.
If the valve position sensor is damaged, the engine ECU sets the maximum valve lift and controls the air supply through the motorized throttle body.