The phase regulator 1 of the camshaft is located on the intake camshaft. The phase regulator is designed to change the valve timing. It's managed (based on yes or no») Injection control unit with solenoid valve 2 mounted on the cylinder head cover.
The displacement of the closing moment of the intake valves optimizes the filling of the cylinders depending on the speed of the crankshaft. The result is increased torque at medium loads and power at high engine speeds.
Under these conditions, the later closing of the intake valves ensures the supply of an additional portion of the fuel mixture due to the high speed of its movement.
On the contrary, at a low rotational speed, the inertia of the charge is small. Early closing of the exhaust valves avoids poor filling of the cylinders and loss of torque due to the 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 solenoid valve is closed. It allows the supply of oil to control the phase regulator, depending on the operating mode of the engine:
- 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 solenoid valve is blocked, in the open position, the engine idles unsteadily, the pressure in the intake manifold at idle is increased.