Control system for continuously variable transmission
US6217469A · kind A · utility
12Cited by
7References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1998 |
| Grant date | Apr 17, 2001 |
| Priority date | — |
| Expiry date | Jul 16, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/66281
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control system controls a line pressure applied to a CVT upon taking account of a certrifugal pressure caused by a rotation of pulleys. The control system determines whether the centrifugal pressure is greater than a predeterminied value only by which the pulley transmits an input torque from an engine. When the determination is affirmative, a lower limit of a duty ratio for operating a line pressure control valve is switched from a lower limit of a linear range to 0% duty ratio. Therefore, an actual transmissiou ratio control range is expanded while preventing an undershoot of the line pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.