Shift control for low torque upshift of automatic transmission

• Main Authors: NAMAZIKAR, MILIND, RUPPLI, BENJAMIN, CICALA STEPHEN MICHAEL, JOHNSON SIMON, LAROCHE, CORY, BENSON
• Format: Patent
• Language: Chinese; English
• Published: 04.11.2022
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GEARING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

The invention provides shift control for low torque upshift of an automatic transmission. 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-requested torque being zero, and a brake pedal being released, command a first pressure greater than zero to an oncoming shift element associated with the upshift such that the oncoming shift element has a torque capacity being zero; in response to applying the brake pedal during an upshift of the transmission, commanding a second greater 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 application of the brake pedal, command a series of sequential ramp pressures to the oncoming shift element to further increase the torque capacity and lock the oncoming shift element. 本公开提供了"用于自动变速器的低扭矩升挡的转换控制"。根据一个实施例，一种车辆包括变速器、制动踏板和控制器。所述控制器被编程为：响应于变速器的升挡、驾