Method and apparatus for controlling reduction ratio of continuously variable transmission with engine coolant temperature compensation
US4566354A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 1983 |
| Grant date | Jan 28, 1986 |
| Priority date | — |
| Expiry date | Apr 19, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H59/78
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A method and an apparatus for controlling the reduction ratio of a continuously variable transmission are disclosed wherein when an actual engine coolant temperature indicative signal is greater than or equal to a predetermined value indicative signal, a desired optimum reduction ratio signal is obtained by retrieving the desired optimum reduction ratio signal data stored in a memory versus an engine load and a vehicle speed. When the actual engine coolant temperature indicative signal is less than the predetermined value indicatiive signal, the same desired optimum reduction ratio signal data are retrieved based on a corrected signal which is obtained by correcting an engine load indicative signal or a vehicle speed indicative signal in order to provide a larger reduction ratio. Alternatively, another optimum reduction ratio signal data are retrieved when the actual engine coolant temperature indicative signal is less than the predetermined value indicative signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.