Adaptive pressure control method for synchronous downshifts in a multiple-ratio transmission
US7216025B2 · kind B2 · utility
22Cited by
12References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2003 |
| Grant date | May 8, 2007 |
| Priority date | — |
| Expiry date | Feb 26, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0087
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An adaptive pressure control method for synchronous downshifts in an automatic transmission that uses pressure actuated friction elements. The method uses characteristic parameters that determine downshift quality for both power-on downshifts and power-off downshifts. Selected measured variables are monitored to detect changes in the parameters. Adjustments for the friction elements are made in response to changes in the measured variables.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.