Automatic transmission lockup control apparatus
US6049752A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1997 |
| Grant date | Apr 11, 2000 |
| Priority date | — |
| Expiry date | Apr 30, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2059/144
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A lockup control apparatus for use with an automotive vehicle including an engine, an automatic transmission and a torque converter having a lockup clutch operable on a variable engagement force to provide a controlled degree of mechanical connection between the engine and the automatic transmission during deceleration. The lockup engagement force is set at a target value substantially equal to a first value calculated based on vehicle operating conditions plus a second value calculated based on engine output at a first stage of lockup control operation when the engine output remains positive after the driver's operation is detected and it is decreased at a predetermined rate to the first value at a second stage of lockup control operation after the engine output becomes negative.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.