Patent number: 6807931

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

Inventors:

  • Taylor; Danny R.
  • Quinn, Jr.; Stanley B.
  • Ekdahl; Earl

Field of technology: Vehicles, Engines and Transportation

Patent granted on: Tue, 26 Oct 2004

Patent drawing

Abstract

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.