Operation

OPERATION

1. ADVANCEMENT IN PHASE ANGLE
The oil flow control solenoid valve applies oil pressure to the advance angle chamber of the camshaft sprocket by moving its spool in response to an advance angle signal from the ECM. As the pressure is applied, the camshaft that is attached to the vanes rotates in the phase angle advance direction in relation to the camshaft sprocket.






2. RETARD IN PHASE ANGLE
The exhaust oil flow control solenoid valve applies oil pressure to the retard angle chamber of the camshaft sprocket by moving its spool in response to an retard angle signal from the ECM. As the pressure is applied, the camshaft that is attached to the vanes rotates in the phase angle retard direction in relation to the camshaft sprocket.







3. CONSISTENT PHASE ANGLE IS RETAINED
When the ECM commands a signal preventing a change in phase angle, the oil flow control solenoid valve move its spool to block oil pressure that is applied to both chambers. Therefore the oil pressure in the chambers are held and the phase angle is retained.