Control apparatus for continuously variable transmission mounted in automotive vehicle
US5672137A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1996 |
| Grant date | Sep 30, 1997 |
| Priority date | — |
| Expiry date | Apr 24, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/66227
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a control apparatus for controlling a gear shift ratio of a continuously variable transmission mounted in an automotive vehicle as an automatic power transmission, a gear shift ratio command value is calculated using a control constant corresponding to a dynamic characteristic determined for each instantaneous gear shift ratio of the continuously variable transmission so as to achieve a target gear shift ratio response characteristic. In addition, a disturbance compensator (robust compensator) of a robust type filter is used against a disturbance such as a parameter variation to achieve a gear shift ratio control characteristic that a designer of the control apparatus has desired to achieve in cases where the parameter variation occurs due to a load variation, a change in an environment temperature or deterioration of an oil viscosity in a hydraulic pressure mechanism which creates a pressing force on each of drive and driven pulleys of the continuously variable transmission and where an individual difference in the dynamic characteristic of the continuously variable transmission due to a working and/or assembly accuracy of a power transmission part of the continuously variable …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.