Control of power-on downshift in a vehicle with an oncoming binary clutch

摘要

A vehicle includes a transmission having a plurality of clutches, including an oncoming binary clutch and an off-going clutch. The oncoming binary clutch is a binary device and the off-going clutch is a non-binary device. An internal combustion engine is operatively connected to the transmission and configured to generate an engine torque based on an input torque request. A controller is operatively connected to the transmission and has a processor and tangible, non-transitory memory on which is recorded instructions for executing a method for controlling a power-on downshift with the off-going clutch and the oncoming binary clutch. The controller is configured to generate a first pressure command at below a threshold pressure to at least partially pressurize the oncoming binary clutch and initiate a clutch slip for the off-going clutch. Among other steps, the controller is configured to determine if synchronization is met.

主权项

1. A vehicle comprising:
a transmission having a plurality of clutches including an oncoming binary clutch and an off-going clutch, the oncoming binary clutch being a binary device and the off-going clutch being a non-binary device; wherein the oncoming binary clutch is engaged when a pressure at or above a threshold pressure is applied; an internal combustion engine operatively connected to the transmission and configured to generate an engine torque based on an input torque request (TR); a torque converter operatively connected to the transmission and including a turbine defining a turbine speed; and a controller operatively connected to the transmission and having a processor and tangible, non-transitory memory on which is recorded instructions for executing a method for controlling a power-on downshift with the off-going clutch and the oncoming binary clutch; wherein execution of the instructions by the processor causes the controller to:
generate a first pressure command at a level below the threshold pressure to at least partially pressurize the oncoming binary clutch;initiate a clutch slip for the off-going clutch; anddetermine if synchronization is met, wherein synchronization is met when a slip speed across the oncoming binary clutch is zero.