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

Patent No. 7,137,369

Issued: November 21, 2006
Filed: September 3, 2004

Inventors: Jiang; Zhenyu (Ithaca, NY)
Assignee: BorgWarner Inc. (Auburn Hills, MI) 

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.


This application claims an invention which was disclosed in Provisional Application No. 60/566,218, filed Apr. 28, 2004, entitled "VCT CLOSED-LOOP CONTROL USING A TWO-POSITION ON/OFF SOLENOID". The benefit under 35 USC .sctn.119(e) of the United States provisional application is hereby claimed, and the aforementioned application is hereby incorporated herein by reference.

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