| 摘要 |
<p>A method of controlling VCT system of a phaser having a control valve controlling fluid flow to shift relative angular position of a rotor relative to a housing is disclosed. In a first step, the cam and the crank position are sensed. Next, the spool position of the control valve is sensed. Then VCT valve phase and engine speed are determined. Threshold is then calculated as a function of spool position, cam position, and engine speed. A set point target for position is accepted from a control unit. The difference between the set point target and the VCT phase is determined and compared to the threshold. When the difference is greater than the threshold, a command is sent to a solenoid controlling control valve position to turn on. When the difference is less than the threshold, a command is sent to a solenoid controlling control valve position to turn off.</p> |
