Determining oncoming clutch pressure in a transmission
US8818663B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2012 |
| Grant date | Aug 26, 2014 |
| Priority date | — |
| Expiry date | Nov 14, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0078
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Clutch pressure of an oncoming clutch may be determined during an upshift in an automatic transmission by determining when offgoing and oncoming clutches of the transmission near a speed synchronization point. Aboard a vehicle, proportional-integral-derivative (PID) feedback control logic of for the oncoming clutch may be activated via a controller. The controller and the activated PID logic may be used to introduce a calibrated slip error between the rotational speeds of the offgoing and oncoming clutches. Engine speed is then held in a calibrated flare using the PID logic. Oncoming clutch pressure is recorded during the duration of the calibrated flare, and a control action is executed with respect to the transmission using the recorded oncoming clutch pressure, e.g., using recorded PID gains and/or a pressure/torque relationship of the oncoming clutch. A vehicle having an engine, transmission, and controller may use the controller to execute such a method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.