Method and apparatus for controlling a continuously variable transmission
US4526557A · kind A · utility
17Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 1983 |
| Grant date | Jul 2, 1985 |
| Priority date | — |
| Expiry date | May 19, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/66259
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A continuously variable transmission includes a hydrodynamic device, such as a fluid coupling or a torque converter, having a lock-up clutch. The reduction ratio of the continuously variable transmission is controlled by a shift motor. The shift motor is controlled such that each of rotary positions thereof corresponds uniquely to a desired optimum reduction ratio. Upon detecting a state wherein a rapid down shift is needed, the lock-up clutch is temporarily disengaged to allow the hydrodynamic device to slip during the rapid down shift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.