Method and system for diagnosing cylinder valve activation/deactivation
US8667835B2 · kind B2 · utility
20Cited by
13References
20Claims
0Family size
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Key dates
| Filing date | Sep 14, 2012 |
| Grant date | Mar 11, 2014 |
| Priority date | — |
| Expiry date | Sep 14, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Methods and systems are provided for monitoring cylinder valve deactivation in an engine operating with a plurality of cylinder valves. One example method comprises indicating valve degradation based on an indication of manifold pressure over a plurality of immediately successive induction events of the engine, the indication responsive to increases and decreases in the indication of manifold pressure correlated to the induction events of engine cylinders and further correlated to whether cylinders are commanded to be activated or deactivated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.