Automatic transmission shift control
US6449548B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2001 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Apr 6, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60W2710/0666
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An automatic transmission ratio shift control system and method for a powertrain having a throttle-controlled engine and multiple-ratio gearing, torque flow paths through the gearing being established and disestablished by pressure-operated friction elements, an electronic controller for establishing torque transitions between the friction elements as ratio changes occur in the multiple-ratio gearing, the engine throttle being controlled by an electronic throttle control that is decoupled from the driver-controlled accelerator pedal, the transmission torque output being controlled by means of a friction element capacity control strategy including a feed-forward torque term determined by changes in commanded torque, the slip duration during a ratio change being controlled by means of closed-loop engine torque control.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.