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
Hard disk drives having different rotational speeds
System and method for interactive image-based modeling of curved surfaces using single-view and multi-view feature curves
Leaky wave mode solar receiver
Information processing apparatus, information outputting method and computer program storage device
Maize hybrid X08B748
Method and system for video parameter analysis and transmission
Autonomous primary-mirror synchronized reset
  Randomly Featured Patents
Control system for a hydraulic press brake
Induction heating apparatus with hinged support and filtered air cooling
Dry roughing pump having a gas film bearing
Resist pattern thickening material, resist pattern and process for forming the same, and semiconductor device and process for manufacturing the same
Image processing apparatus, method and storage medium
Programming device
New Guinea Impatiens plant named `Kiped`
Fluid flow control valves
Logistics simulator
Monolithic inductance-enhancing integrated circuits, complementary metal oxide semiconductor (CMOS) inductance-enhancing integrated circuits, inductor assemblies, and inductance-multiplying me