Resources Contact Us Home
Two-step oil control valve failure diagnostic

Image Number 4 for United States Patent #7783413.

A method may include commanding operation of an engine in a first lift mode. The engine may include a valve lifter system that selectively operates a valve member in the first lift mode and a second lift mode through engagement with a camshaft. A first duty cycle of a cam phaser oil control valve (OCV) may be determined to maintain a first camshaft position corresponding to the first lift mode. The camshaft position may be maintained by a cam phaser that is coupled to the camshaft and in communication with the cam phaser OCV. Engine operation may be commanded to the second lift mode and a second duty cycle of the cam phaser OCV may be determined to maintain a second camshaft position corresponding to the second lift mode. A valve lifter system failure may be diagnosed based on a difference between the first and second duty cycles.

  Recently Added Patents
Semiconductor device and method of adjusting characteristic thereof
Spoofing detection for civilian GNSS signals
Cover panel for frame based door lock
Graphical user interfaces and occlusion prevention for fisheye lenses with line segment foci
Polymeric structures comprising a siloxane
Method of manufacturing touch panel
Light powered hearing aid
  Randomly Featured Patents
Liquid crystal display and method of driving the same
Network system for connecting to a network node from terminal
Compositions and methods for treatment of neovascular diseases
Operating lever mechanism for offset printing press
Light bulb socket mounting structure and method
Mixing apparatus and method
Evaluation and treatment of patients with progressive immunosuppression
Plug and play solar panel assembly
Systems for distributing data over a computer network and methods for arranging nodes for distribution of data over a computer network