Automatic transmission having torque converter with lockup clutch and method of controlling same lockup clutch
US7366601B2 · kind B2 · utility
7Cited by
11References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2003 |
| Grant date | Apr 29, 2008 |
| Priority date | — |
| Expiry date | Sep 22, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/146
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
When a downshift instruction has been detected, the oil pressure of a lookup clutch is controlled, and the state of operation of the automatic transmission is detected. If a starting condition has been met, a slip rotation speed of the lockup clutch is calculated, and if the calculated slip rotation speed is greater than or equal to a reference rotation speed, the calculated slip rotation speed is set as a target slip rotation speed. If a condition for converging the target slip rotation speed has been met, the target slip rotation speed is then converged to a steady target rotation speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.