Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Methods of diagnosing a plasmodium infection
Systems and methods for providing live voicemail to a mobile handset
Semiconductor device, semiconductor device design method, semiconductor design apparatus, and program
MOS device for eliminating floating body effects and self-heating effects
Method to alter silicide properties using GCIB treatment
Salts and polymorphs of desazadesferrithiocin polyether analogues as metal chelation agents
Devices, systems, and methods for tactile feedback and input
  Randomly Featured Patents
In-vehicle handsfree apparatus
Gas generator for seat belt pretensioner
Use of recycled plastics for structural building forms
Horizontal/vertical protection level adjustment scheme for RAIM with baro measurements
Portable electronic flasher
Starting circuit and method for the stable starting of a circuit arrangement with plural feedback control circuits
Facilitating distributed channel access for a plurality of access terminals transmitting in a wireless communication environment
High color rendering index white LED light system using multi-wavelength pump sources and mixed phosphors
Graphical representation of assets stored on a portable media device
Analytical equipment with function of detecting liquid surface capacitively