Adaptive control of servo activating pressure for motor vehicle automatic transmission
US5109732A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1990 |
| Grant date | May 5, 1992 |
| Priority date | — |
| Expiry date | Dec 7, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0096
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present invention relates to an adaptive correction of servo activating hydraulic fluid pressure in agreement with driving force variability. In one embodiment according to the present invention, a ratio of a mass airflow of intake air admitted to an engine (Qa) and a revolution speed of a transmission output shaft (No) is calculated, and a parameter (TqSEN) is determined as a function of the ratio (Qa/No). The servo activating hydraulic fluid pressure is determined in response to this parameter. In another embodiment, a turbine shaft speed (Nt) is calculated from the output shaft speed (No) and a gear ratio (g) of a gear position established before shifting. The turbine shaft revolution speed (Nt) is used instead of the output shaft revolution speed (No) in determining a parameter (TqSEN).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.