System for controlling a continuously variable transmission in response to a sensed wheel deceleration
US5586953A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 27, 1995 |
| Grant date | Dec 24, 1996 |
| Priority date | — |
| Expiry date | Jan 27, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S477/904
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In order to improve steering performance and braking performance specifically on a low .mu. road surface during operation of engine braking, there are provided, in a shift control system of a continuously variable transmission, a sensor for determining a wheel deceleration, and a shift controller for changing a shift pattern adequately. When an engine brake range such as a 2 range or an L range is selected, and the wheel deceleration becomes greater than a predetermined deceleration level, the shift controller changes an upshift limit of the engine brake range, to a smaller transmission ratio. By reducing the transmission ratio in this way, the shift control system can reduce an engine braking force applied to the drive wheels and an inertia torque of the transmission against the driving force applied to the drive wheels by the road surface, so that the wheel speed can readily increase to achieve a desirable degree of wheel slip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.