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
Method and apparatus for complementing an instrument panel by utilizing augmented reality
Smart television system having methods or means for accessing paid or subscribed digital content from the internet
Signal processing device, signal processing method and program
Contamination barrier
Vibration disturbance estimation and control
Interconnecting virtual domains
Thermoforming sheet loading apparatus and method
  Randomly Featured Patents
Method for drilling thru-holes on a lamination substrate and a sheet used therein
Dual port static RAM with bidirectional shift capability
Patients' support installation for a tomographic X-ray apparatus
Seatbelt retractor having multi-level load-limit setting devices
Method for making enhanced substrate contact for a semiconductor device
Recognition device, bonding device, and method of manufacturing a circuit device
Variable displacement reciprocating piston machine
Circuit arrangement for protected data transmission, particularly in ring-shaped bus systems
Process for passivating uranium oxides to control oxidation