Control system for automatic vehicle transmissions
US6516261B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1999 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Aug 23, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0227
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A system for controlling an automatic transmission of a vehicle which determines a downgrade or upgrade parameter based on the vehicle acceleration and selects one from among a plurality of shift programs based on the determined grade parameter to determine a gear ratio based on the selected shift program. The system includes a navigation system which determines the instantaneous vehicle position and outputs road information including upgrade/downgrade condition of road including the determined instantaneous vehicle position. In the system, the grade parameter is corrected based on the navigation information and the grade parameter such that the one from among a plurality of shift programs is selected based on the corrected grade parameter, thereby enhancing drivability during downgrade running, without being affected even if the navigation information is temporarily invalid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.