Emissions control during cam profile switching diagnostic operation
US9416735B2 · kind B2 · utility
11Cited by
5References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 21, 2012 |
| Grant date | Aug 16, 2016 |
| Priority date | — |
| Expiry date | May 14, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A diagnostic routine momentarily forces an engine to an alternative operating condition, and at the same time adjust fuelling of the engine so as to be appropriate to the alternative operating condition (31). In one embodiment substantially unchanged exhaust constituents (32) indicate correct adoption of the alternative operating condition. In another embodiment a substantial change in a calculated measure is indicative of correct adoption of the alternative condition. The invention allows better control of undesired exhaust emissions during operation of the diagnostic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.