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
Pausing a VoiceXML dialog of a multimodal application
Random access for wireless multiple-access communication systems
Method and structure for image local contrast enhancement
Collating device, collating method, and program
System for collecting computer application usage data of targeted application programs executed on a plurality of client devices
Expandable mobile device
Image reading apparatus, image reading method and program
  Randomly Featured Patents
Concrete smoothing apparatus
Plunger and evaporative base
Characteristic adjusting method in process of manufacturing products
Picture pick-up and display system with electronic and printed picture display
Arrangement for transporting wire coils
Flash memory data correction and scrub techniques
Compact portable icemaker
Utilization of media capabilities in a mixed environment
Apparatus for forming a container side wall
Apparatus and method for depacketizing and aligning packetized input data