Compensation for a drag force generated by a rotating clutch piston seal
US9587684B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 2015 |
| Grant date | Mar 7, 2017 |
| Priority date | — |
| Expiry date | Sep 4, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2048/0284
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method of regulating a clutch assembly that has a set of clutch plates and a clutch piston with a fluid seal in an automatic transmission that includes a hydraulic circuit is disclosed. The method includes commanding the hydraulic circuit via the controller to apply a first hydraulic force to the clutch piston to displace the clutch piston relative to the set of clutch plates in order to affect a shift between speed-ratios in the transmission. The method also includes determining a drag force of the fluid seal. The method also includes determining a velocity of the displaced clutch piston that results from the drag force of the fluid seal acting counter to the displacement of the clutch piston. The method additionally includes regulating the clutch assembly to compensate for the determined drag force of the fluid seal acting counter to the displacement of the clutch piston.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.