Variable displacement engine diagnostics
US7921709B2 · kind B2 · utility
31Cited by
17References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2009 |
| Grant date | Apr 12, 2011 |
| Priority date | — |
| Expiry date | Jan 13, 2029 |
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 of a cylinder valve of an engine. One example method comprises, indicating degradation of cylinder valve deactivation in response to manifold pressure at or around a characteristic frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.