Speed change control method for an automatic transmission for vehicles
US5361207A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 13, 1992 |
| Grant date | Nov 1, 1994 |
| Priority date | — |
| Expiry date | Mar 13, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S706/90
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a speed change control method for setting the gearshift position of an automatic transmission for vehicles with a plurality of gearshift positions, to a position selected on the basis of vehicle speed and engine load, in accordance with a preset shift pattern for a first control mode, one of the gearshift positions is selected by fuzzy inference in accordance with at least one of parameter values which represent operating conditions of the vehicle, parameter values which represent driver's driving intention, and parameter values which represent road conditions. Further, the gearshift position of the automatic transmission is set to the position selected by the fuzzy inference only if the gearshift position selected by the fuzzy inference provides a lower speed than that provided by the gearshift position selected in accordance with the shift pattern for the first control mode. Preferably, a plurality of control modes including the first control mode are provided, one of the control modes is selected by the fuzzy inference in accordance with at least the degree of winding and gradient of a road on which the vehicle is traveling, and a gearshift position to be set is selected in a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.