Method and system for variable displacement engines
US10823093B2 · kind B2 · utility
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15References
20Claims
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Key dates
| Filing date | Mar 26, 2019 |
| Grant date | Nov 3, 2020 |
| Priority date | — |
| Expiry date | Mar 26, 2039 |
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 diagnosing valve operation during a cylinder deactivation event in a variable displacement engine. Crankshaft acceleration data is captured during an exhaust stroke of a deactivated cylinder and compared to a calibrated map of crankshaft acceleration data for the given cylinder. Based on the comparison, it may be indicated that the deactivation of the exhaust valve of the given cylinder is degraded, and that the exhaust valve is open when commanded closed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.