VCT closed-loop control using a two-position on/off solenoid

Details VCT closed-loop control using a two-position on/off solenoid VCT closed-loop control using a two-position on/off solenoid

2006-11-21

2006-11-21

Denion, Thomas (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

C123S090170, C464S160000

Reexamination Certificate

active

07137369

ABSTRACT:
In a VCT system having a feedback loop including a sensed signal and a set point, a method is provided, which includes the steps of: determining a switch variable which is related to the sensed signal and the set point; computing the switch variable; and according to the value of the switch variable, controlling the operation of an on/off two position solenoid that controls the flow of a control fluid flowing within a VCT phaser. Thereby the control fluid either flows in one direction or another direction by means of using a two-position ON/OFF solenoid for actuating a spool valve which controls the flow direction with the VCT phaser.

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