Method and system for cylinder imbalance estimation
US10801431B2 · kind B2 · utility
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6References
22Claims
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Key dates
| Filing date | Feb 8, 2019 |
| Grant date | Oct 13, 2020 |
| Priority date | — |
| Expiry date | Feb 8, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/0616
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Methods and systems are provided for learning a cylinder-to-cylinder air variation. During conditions when a PFDI engine is operated in a port-injection only mode, prior to port fuel injection, a direct-injection fuel rail pressure may be lowered via direct-injection. Then, prior to a spark event in a port-injected cylinder, the direct-injector may be transiently opened to use the rail pressure sensor for estimating a cylinder compression pressure, and inferring cylinder air charge therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.