Pressure setting valve and hydraulic control system having the same for an automatic transmission
US5997437A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1997 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Dec 30, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86614
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The hydraulic control system is used in automatic transmissions having a plurality of friction elements associated with respective transmission speeds; a hydraulic fluid source; a line pressure controller for regulating hydraulic pressure supplied from the fluid source to line pressure; a range controller for selectively supplying hydraulic pressure from the line pressure control device; a shift controller for supplying hydraulic pressure from the range controller to lines corresponding to the respective transmission speeds by control of a transmission control unit; a hydraulic pressure controller for converting hydraulic pressure from the range controller to operational pressure operating the friction elements; and a hydraulic pressure distributor for determining a hydraulic flow path corresponding to the respective transmission speeds according to the hydraulic pressure from the shift controller, and for distributing the operational pressure to each friction element in accordance with that determination. The line pressure controller includes a line pressure regulating valve for regulating hydraulic pressure from the hydraulic fluid source to line pressure; and a pressure setting …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.