Hydraulic pressure control apparatus and method for vehicular automatic transmission
US6929584B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2003 |
| Grant date | Aug 16, 2005 |
| Priority date | — |
| Expiry date | Aug 7, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S477/906
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A switching valve is provided which operates hydraulic friction engaging elements in a combination to establish a fifth speed “5th” when in a first position, and in a combination to establish a third speed “3rd” when in a second position, when a first electromagnetic valve to a fifth electromagnetic valve fail so as to stop operating. As a result, in the event of failure while driving, the fifth speed “5th” is first established to enable the vehicle to continue running. Then, when the position of a manual valve is changed by an operation by the driver when the vehicle is stopped or the like, the switching valve shifts a transmission into the third speed “3rd”, which has a larger gear ratio than the fifth speed “5th”, to ensure the driving force required to take off again.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.