Transmission clutch control apparatus and method
US8364361B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2008 |
| Grant date | Jan 29, 2013 |
| Priority date | — |
| Expiry date | Dec 1, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2500/70652
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method for controlling a clutch assembly includes controlling an actual clutch fill pressure using open-loop pressure controls when an active fill phase is detected, and using closed-loop pressure controls when the active fill phase is complete or when an overfill condition is detected. The method supplies the actual clutch pressure according to a second set of open-loop pressure controls when a step in commanded clutch pressure is detected. The method monitors a fill pressure and time during the step, and applies the clutch pressure according to the closed-loop pressure controls when either value equals a corresponding threshold value. A clutch assembly has a piston for compressing clutch disks to initiate a shift event, an algorithm for controlling the shift event, and a sensor for determining an actual clutch pressure during the shift phases. The algorithm switches between closed-loop and open-loop pressure controls in response to different shift phases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.