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
Method and system for capturing and providing typological and contextual information about a location based on wireless beacons
Electric connector
Expandable anchoring mechanism
Smart card session optimization
Hair rollers
  Randomly Featured Patents
Compact external cavity tunable lasers using hybrid integration with micromachined and electrooptic tunable elements
Brake arrangement for magnetic or electric ergometer
Methanation catalyst and process for preparing the catalyst
Apparatus and method for cleaning underground liquid fuel storage tanks
Pulse detection apparatus, software, and methods using patient physiological signals
Method for controlling thickness uniformity of electroplated layers
Method of changing communication channel in mobile system
Sheet post-processing apparatus
Front face of a key plug
Solvent extraction of copper with dilution of the organic phase