Hydraulic control unit for automatic transmission
US6634991B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 8, 2001 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | May 8, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2306/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic control unit including a hydraulic servo for engaging and disengaging each friction engagement element, hydraulic pressure supply device for supplying hydraulic pressure to a hydraulic servo of a predetermined friction engagement element selected according to a gearshift position to be achieved, failure detection device for detecting a failure has occurred in the hydraulic pressure supply device, and fail-safe device for preventing interlock that occurs due to a plurality of friction engagement elements being engaged, and also prevents a gearshift from a high-speed position to a low-speed position, when the failure detection device detects that a failure has occurred.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.