Variable Valve Timing Actuator: Description and Operation

VARIABLE VALVE TIMING (VVT) CONTROL SYSTEM

VVT system controls the intake valve timing to proper timing in response to driving condition. ECM controls OCV (Oil Control Valve) to make the intake valve timing properly, and, oil pressure controlled with OCV is supplied to the VVT controller, and then, VVT controller changes relative position between the camshaft and the crankshaft.

VARIABLE VALVE TIMING (VVT) SENSOR

VVT sensor (VV1 or VV2 signal) consist of a signal plate and pickup coil.
The VV1 or VV2 signal plate has 1 tooth on its outer circumference and is mounted on the intake camshafts.

When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change, causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil. The actual camshaft angle is detected by the VVT sensor and it provides feedback to the ECM to control the intake valve timing in response to during condition.