The camshaft phase regulator 1 is located on the intake camshaft. The phase regulator is designed to change the valve timing. It is controlled (on a "yes or no" basis) by the injection system ECU using the electromagnetic valve 2 installed on the cylinder head cover.
The offsetting of the intake valve closing moment optimizes cylinder filling depending on the crankshaft speed. As a result, torque is increased in the medium-load mode and power at high crankshaft speed.
Under these conditions, later closing of the intake valves ensures the supply of an additional portion of the fuel mixture due to its high speed of movement.
On the contrary, at low rotation speeds the charge inertia is small. Earlier closing of the exhaust valves allows to avoid poor filling of the cylinders and loss of torque due to displacement of part of the fresh charge of the mixture.
The higher the crankshaft speed, the later the intake valves should close.
In the initial state, the electromagnetic valve is closed. It allows the supply of oil to control the phase regulator depending on the engine operating mode:
- if the engine speed is approximately in the range of 1500-4250 min⁻¹;
- if the coolant temperature is above 30°C.
Attention! When the electromagnetic valve is blocked, in the open position the engine runs unstably at idle and the pressure in the intake manifold at idle is increased.