Continuous variable cam phasing (CVCP)
Continous variable cam phasing (CVCP) is a system that makes continual variation of the intake camshafts' position, i.e. phasing, possible. The duration (the number of degrees the values are hold open) remains constant. It is the position of the cam lobes, i.e. the camshaft angles when the intake values open or close, that are different. This is controlled by ECM via hydraulic valves in order to obtain the optimal intake camshaft setting at any given operating point.
Since ECM regulates the hydraulic valves with a PWM voltage, the valves can be stepplessly moved into the requested position. To compensate for the oil delivery pressure, the engine is equipped with a pressure sensor that measures engine lubricating oil pressure.
CVCP has the following advantages:
- High engine output
- High engine torque over a broad rpm range
- Reduced emissions, especially NOx
- Reduced fuel consumption