Hydraulic control for a vehicle powertrain
US8056666B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2009 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Dec 25, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2312/14
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A vehicle powertrain includes an engine capable of being selectively turned on and turned off, a transmission operatively connected to the engine, and a hydraulic control system including a pump in fluid communication with the transmission. The pump is operatively connected to the engine for supplying fluid to the transmission when the engine is on, wherein the pump is idle when the engine is off. The hydraulic control system additionally includes an accumulator arranged to accumulate the fluid when the engine is on. The accumulator is also controlled to accumulate fluid when the engine is on, to retain the fluid when the engine is turned off, and to discharge the fluid to the transmission when the engine is restarted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.