Pic. 2.229. Phase regulator solenoid valve: 1 - valve
Oil is supplied to the phase regulator through a solenoid valve mounted on the cylinder head (pic. 2.229).
The valve is energized in the form of a variable signal of the degree of cyclic opening (amplitude 12 V and frequency 250 Hz), which allows you to supply oil to the mechanism, and thus change the phase angle.
The ECU feeds the solenoid valve with a variable cyclic opening degree signal, the magnitude of which is proportional to the required phase shift.
The phases change smoothly from 0 to 43°along the angle of rotation of the crankshaft.
The camshaft dephaser solenoid valve is controlled under the following conditions:
- no malfunction of the crankshaft speed sensor;
- no faults in the camshaft position sensors;
- no malfunctions in the injection system;
- after starting the engine;
- when the engine is not idling with the accelerator pedal released;
- the threshold value of the injection profile is obtained, which is set taking into account the load and the crankshaft speed;
- coolant temperature within 10–120°С;
- elevated engine oil temperature.
Backup Modes:
- return of the phase regulator to its original position;
- zero phase shift.
Attention! When the solenoid valve is blocked in the open position, the engine idles unsteadily, the pressure in the intake manifold is increased, and there is also increased engine noise.