Apparatus for controlling lock-up clutch in vehicle automatic transmission according to fuzzy set theory
US5095435A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1990 |
| Grant date | Mar 10, 1992 |
| Priority date | — |
| Expiry date | Aug 17, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S706/90
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An apparatus for controlling a lock-up clutch in a vehicle automatic transmission having a speed changing mechanism and a fluid coupling, wherein an engine is connected directly to the speed changing mechanism when the lock-up clutch is engaged. The apparatus includes a determining device for determining satisfaction degrees of at least one basic fuzzy set theory rule corresponding to the released and engaged positions of the clutch, based on a predetermined clutch control pattern, a first calculating device for calculating satisfaction degrees of fuzzy set control rules, corresponding to the two positions of the clutch, depending upon a detected vehicle running condition, a second calculating device for calculating overall satisfaction degrees for selecting the respective positions of the clutch, based on the calculated satisfaction degrees of the basic fuzzy set theory rule or rules and the calculated satisfaction degrees of the fuzzy set control rules, and a selector for selecting one of the two positions of the clutch, based on the calculated overall satisfaction degrees.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.