Revolution and Timing Sensors

Revolution, Crankshaft or Camshaft Position Sensors are usually located on a gear wheel (phonic wheel), disks consisting of sectorized windows or rings of ferro- magnetic material. These sensors detect magnetic flux variations which are produced by the alternation between the presence and absence of the teeth of the gear wheel, or the cam relief. The reading of the magnetic flux variations are turned into an electrical signal, which goes directly to the control unit and checks, depending of the sensor, the following aspects:

  • Crankshaft Position Sensors: 
    These sensors verify the top dead center position by detecting the position of the drive shaft. The vehicle control unit uses this information to calculate the time of injection and the ignition system.
     
  • Camshaft Position Sensors: 
    These sensors control the injection sequence and the synchronization of the ignition spark.
     
  • Speed Sensors: 
    These sensors control the engine speed in revolutions and the turning points of the transmission.