Method to reduce noise of a cam phaser by controlling the position of center mounted spool valve
Patent No. 6,840,202
Issued: January 11, 2005
Inventor: Simpson; Roger T. (Ithaca, NY)
To reduce the noise caused by torsional reversals of a rotor hitting the phaser housing in a VCT cam timing system. A cam torque actuated phaser (phaser with check valves) the control loop is opened and rather then moving the spool valve to one end or the other end, the spool valve is moved just slightly off null. By doing this the oil ports in the spool passageways that control the motion of the phaser are restricted and the motion of the phaser is reduced. Therefore the noise of the phaser is reduced.
This application claims an invention which was disclosed in Provisional Application No. 60/407,885, filed Sep. 3, 2002, entitled "METHOD TO REDUCE NOISE OF A CAM PHASER BY CONTROLLING THE POSITION OF CENTER MOUNTED SPOOL VALVE".
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