5 XF 95 series Description of components COMPONENTS 2. DESCRIPTION OF COMPONENTS 2.1 INDUCTIVE SENSOR The vehicle has a number of inductive sensors, such as: - wheel speed sensor - engine speed sensor - camshaft sensor Recording engine speed The engine speed is recorded via the crankshaft position sensor. The crankshaft position sensor output signal is a sine wave signal with a frequency corresponding to the number of holes in the pulse disc and the crankshaft rotation frequency. In the electronic unit, the signal is converted into a message, which is sent via the CAN network. The DIP reads this message from the CAN network and activates the rev counter.
2 1 2 3 i400442 Engine speed sensor operating principle The inductive sensor consists of a permanent magnet (1), a core (2) and a coil (3). When the inductive sensor is situated between two teeth, the lines of force of the magnetic field will run directly from the north pole to the south pole via the housing. 1 N The moment a tooth approaches the inductive sensor, the lines of force of the magnetic field will run from the north pole to the south pole via the housing, the teeth of the toothed wheel and the core. As more lines of force are now running through the core, a more powerful magnetic field is obtained.
As a result of this change in the magnetic field, an AC voltage is generated in the coil. S 2 3 The value of the AC voltage generated depends on the speed of rotation of the toothed wheel and the air gap between sensor (core) and tooth. W 5 01 005 200303 2-1