Control of manifold vacuum in skip fire operation
US9273643B2 · kind B2 · utility
20Cited by
32References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2013 |
| Grant date | Mar 1, 2016 |
| Priority date | — |
| Expiry date | May 7, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2250/41
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variety of methods and arrangements are described for selectively reducing intake manifold pressure in a skip fire engine control system. In some embodiments, a throttle is adjusted to generate a manifold vacuum, which is used for various applications, including but not limited to purging a fuel vapor canister, reducing pressure within a brake vacuum booster reservoir and/or venting gas from a crankcase interior. An engine firing fraction is increased to help maintain a desired torque level. Other techniques for reducing the intake manifold pressure are also described, such as applications involving a return to idle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.