Monitoring of a cam profile switching system in internal combustion engines
US7621175B2 · kind B2 · utility
1Cited by
4References
15Claims
0Family size
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Key dates
| Filing date | Aug 2, 2007 |
| Grant date | Nov 24, 2009 |
| Priority date | — |
| Expiry date | Nov 7, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for detecting degradation in the cam profile switching system in either bank 2, 3 of a V-engine 1 relies on a comparison of the lambda values in each exhaust bank 4, 5 immediately prior to and subsequent to a cam profile switching event in one of the banks. If there is little or no change after switching, then the apparatus deduces that the switched bank has experienced degradation. The method is easy to calibrate and does not require continuous monitoring of engine behavior.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.