Transition control for low torque upshifts of an automatic transmission
US11408504B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 2021 |
| Grant date | Aug 9, 2022 |
| Priority date | — |
| Expiry date | May 4, 2041 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2200/2046
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
According to one embodiment, a vehicle includes a transmission, a brake pedal, and a controller. The controller is programmed to, in response to an upshift of the transmission, a driver-demanded torque being zero, and the brake pedal being released, command a first pressure, that is greater than zero, to an oncoming shift element associated with the upshift such that the oncoming shift element has a torque capacity of zero, in response to the brake pedal being applied during the upshift of the transmission, command a second, larger pressure to the oncoming shift element to increase the torque capacity to a non-zero value, and, in response to expiration of a threshold time from the brake pedal being applied, command a series of sequentially ramping pressures to the oncoming shift element to further increase the torque capacity and lock the oncoming shift element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.