Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Packaging article
Optical scanner and image-forming device
Method for remotely measuring fluctuations in the optical index of refraction of a medium
High throughput thin film characterization and defect detection
Substantially aligned boron nitride nano-element arrays and methods for their use and preparation
Authentication service
Methods, systems, and products for providing ring backs
  Randomly Featured Patents
Cathode electrocatalyst
Two-level priority arbiter generating a request to the second level before first-level arbitration is completed
Method for fabricating a metallic article without any melting
Extruded wire duct end cap
Paging receiver having data rate detector for continuing address receiving mode
X-ray machine
Slide notch cigarette pack sleeve
Electromagnetic pulse operated bi-stable brake
Light emitting device with microlens array
Video multiplying system