Invention Grant
- Patent Title: Two-step oil control valve diagnostic systems
- Patent Title (中): 两步油控阀诊断系统
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Application No.: US12435725Application Date: 2009-05-05
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Publication No.: US07921710B2Publication Date: 2011-04-12
- Inventor: Kenneth J. Cinpinski , Donovan L. Dibble , Joshua Cowgill
- Applicant: Kenneth J. Cinpinski , Donovan L. Dibble , Joshua Cowgill
- Assignee: GM Global Technology Operations LLC
- Current Assignee: GM Global Technology Operations LLC
- Main IPC: G01M15/04
- IPC: G01M15/04

Abstract:
A diagnostic system includes a first pressure monitoring module, a second pressure monitoring module, and a fault determination module. The first pressure monitoring module determines low-lift pressures and high-lift pressures in a cam phaser when a first oil control valve (OCV) moves first valve lifters to the low-lift state and the high-lift state, respectively. The second pressure monitoring module determines low-lift pressures and high-lift pressures in the cam phaser when a second OCV moves second valve lifters to the low-lift state and the high-lift state, respectively. The fault determination module diagnoses a fault in one of the first OCV and the second OCV based the low-lift pressures and the high-lift pressures.
Public/Granted literature
- US20100281966A1 TWO-STEP OIL CONTROL VALVE DIAGNOSTIC FROM PHASER OIL PRESSURE Public/Granted day:2010-11-11
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