Engine – Cayenne V8
Page 1.24
Solenoid Hydraulic Valve
The solenoid hydraulic valve is designed as a 4-way proportional valve,
which connects one of the two control lines (-A/B-) to the oil pressure
supply line (-P-) depending on the control unit specification and opens
the other line so that the oil can flow into the crank chamber (-T-line-).
If the -A- line is pressurized with oil, the controller will change direction
to advance the valve timing. If the -B- line is pressurized with oil, the
controller will change direction to retard the valve timing. Both control
lines are closed in the center position. The camshaft is held in the
desired position. In addition, any intermediate position between the
three switch positions described above can be set via the control unit.
Therefore, it is possible not only to move the adjustment position very
quickly but also to move it very slowly in the case of slight deviations of
the valve from the central position. In this way, the solenoid hydraulic
valve defines the adjustment direction and speed of the controller.
• Oil supply for cam phaser camshaft bearings and timing chain
tensioner integrated in one bearing support.
• Screw connection of bearing support together with cam cap bolts.
• Oil Supply for first camshaft bearing (intake side) integrated in A-B oil
supply for cam phaser (bleed > T).
• Advantage: no separate oil supply housing (V8 - 4.5) and no square
section sealing rings necessary.
T - Solenoid hydraulic valve
P - Main oil pressure
A - Control pressure
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