Automatic transmission control system for automotive vehicle
US5342246A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 21, 1993 |
| Grant date | Aug 30, 1994 |
| Priority date | — |
| Expiry date | Jul 21, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/0272
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control system for an automatic transmission of an automotive vehicle is provided. This control system includes a forward speed holding valve which is arranged in a hydraulic line communicating between a manual selector valve and a reverse frictional element such as a low and reverse brake, and has a first valve position which establishes fluid communication between the manual selector valve and the reverse frictional element to supply the hydraulic pressure from the manual selector valve to the reverse frictional element and a second valve position which blocks the fluid communication therebetween. When a selector lever is shifted to a reverse position while a vehicle is parked, the forward speed holding valve is controlled to assume the first valve position to engage the reverse frictional element. When the selector lever is placed in the reverse position while the vehicle is traveling forward, the forward speed holding valve is controlled to assume the second valve position to release the reverse frictional element for preventing the automatic transmission from shifting to a reverse mode when a driver mistakenly shift the selector lever to the reverse range during traveling fo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.