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

Image Number 2 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
Polarization-coupled ferroelectric unipolar junction memory and energy storage device
Human embryonic stem cell methods and PODXL expression
Lateral double diffused metal oxide semiconductor device and method of manufacturing the same
Calendar integration methods and systems for presentation of events having combined activity and location information
Method and structure for image local contrast enhancement
  Randomly Featured Patents
Braking device for indoor exercise bicycles
Combined dispenser and caddy for baby toiletries
Image-recording materials and image-recording carried out using these
Line scan area signature detection system
Automatic material labeling during spectral image data acquisition
Method of transluminal application of myogenic cells for repair or replacement of heart tissue
Polyimide resin compositions for optical filters
Transparent material processing with an ultrashort pulse laser
Blocker for eyeglass lenses
Heel cushion