Closed loop control of shifting clutch actuators in an automatic speed change transmission
US6807472B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 2002 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Dec 23, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2342/10
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method of controlling hydraulic shift clutch actuators in an automatic speed change power transmission of the type having an electronic controller (TCU) for energizing a solenoid operated valve to control each hydraulic clutch actuator. A pressure sensor is disposed to sense the hydraulic pressure (Ps) to each clutch actuator and provides an electrical signal to the TCU which also receives a clutch pressure command signal (Pc) from the vehicle powertrain computer. The TCU computes the differential &Dgr;P=Pc−Ps and determines the valve energization current IE from known relationships between &Dgr;P and the percentage of maximum valve current and repeats the process in real time to adjust IE until &Dgr;P is negligible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.