Line pressure control for automatic transmission
US5007308A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1989 |
| Grant date | Apr 16, 1991 |
| Priority date | — |
| Expiry date | Jul 19, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0255
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A line pressure control during a shifting operation of an automatic transmission is disclosed. Quality of each shifting operation is represented by a predetermined variable, viz, an inertia phase time during which a gear ratio undergoes a variation. When a deviation between circumstances detected upon occurrence of a shifting operation and predetermined circumstances under which a target value is set fails to fall in a predetermined range, a deviation indicative signal is generated. Upon absence of this deviation indicative signal after completion of the shifting operation, the inertia phase time measured during the shifting operation is compared with the target value and the line pressure is adjusted in response to this comparison result when the shifting operation of the same kind is to occur under substantially the same circumstances detected. In other words, the learning to adjust the line pressure is prohibited when the deviation indicative signal is present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.