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A Continuously Variable Cam Phaser (CVCP) used in conjunction with the correct control algorithm can help reduce the negative impact on the environment as well as reduce the energy consumed. Cam phasing has the benefit of improving power and emissions while simultaneously improving fuel economy. This paper will discuss the need for having a good control scheme when using a variable cam phaser and the factors that influence its performance. The paper will outline the factors which affect the cam phaser reaction, and hence the control. The paper will also discuss the importance of using feedback control to properly position the CVCP under dynamic conditions.