Diagnostic systems and methods for a two-step valve lift mechanism
US8181508B2 · kind B2 · utility
18Cited by
2References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2009 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Nov 8, 2030 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2820/043
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system includes a pressure signal adjustment module that generates a maximum pressure signal based on a fluid pressure signal from a pressure sensor of a camshaft phaser system of an engine. The pressure signal adjustment module detects a maximum peak value of the fluid pressure signal and maintains the maximum pressure signal at the maximum peak value for a peak and hold period. A diagnostic module detects a fault of the camshaft phaser system based on the maximum pressure signal during the peak and hold period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.