Control method for transitions between open and closed loop operation in electronic VCT controls

Patent No. 6,807,931

Issued: October 26, 2004

Inventors: Taylor; Danny R. (32 Upper Creek Rd., Freeville, NY 13068); Ekdahl; Earl (19 Makarainen Rd., Ithaca, NY 14850); Quinn, Jr.; Stanley B. (175 Fairlane Ave., Elmhurst, IL 60126)

Assignee: BorgWarner, Inc. 

In a Variable Cam Timing (VCT) control system, there are conditions when the system must operate in an open-loop mode, and other situations where closed-loop operation is desired. A number of operating states is provided for VCT control system to switch between the states. A control methodology for switching between these two modes of operation, with minimal disturbances, is described. Further, during switching from open loop to closed loop, a scheme that impedes the impact upon the VCT system is provided.

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