5.2.9. EDC control system

The electronic control system of the diesel EDC engine for Common Rail includes three big systems:

  1. Sensors for registration of parameters of the operational mode which transform various material parameters to electric signals.
  2. ECU for generation of output electric signals on the basis of signals from sensors and the set algorithm.
  3. Drives for transformation of output electric signals of ECU to mechanical parameters.

Sensor of frequency of rotation of a bent shaft

1 – permanent magnet
2 – casing
3 – engine case

4 – metal core
5 – coil
6 – gear rotor

Position of the piston in the cylinder of the engine is decisive in definition of the moment of injection of fuel in the combustion chamber. As pistons through rods are rigidly connected with a bent shaft, the sensor of provision of a bent shaft transfers to the control unit information concerning position of all pistons. The inductive sensor determines the frequency of rotation of a bent shaft by angular speed, and this important entrance variable is transferred to ECU.

The ferromagnetic rotor with 60 teeths is fixed on cranked to a shaft, at the same time on a rotor there are no 2 teeth. This interval is located in a certain situation in relation to a bent shaft and position of the piston in the first cylinder. The sensor represents a permanent magnet and a metal core with the inductive coil. When passing about a pole of the sensor of teeths of a rotor in it the sinusoidal tension which amplitude increases with increase in frequency of rotation of a bent shaft is induced.

Sensor of position of the camshaft

The camshaft operates inlet and final valves and rotates with a frequency twice less than the frequency of rotation of a bent shaft. At the movement of the piston to the top dead point position of the camshaft specifies what piston is in a step of compression or a step of release.

The sensor of position of the camshaft works at Hall's effect. The short-term signal of the sensor reports to ECU that the piston of the first cylinder passed into a compression step.

Temperature sensors