Rolling and regular garage shifts in new rear wheel drive powerflows

摘要

A system for controlling a transmission of a vehicle includes an engine control module that generates a command, while the vehicle is rolling in either a forward or reverse direction, to change a transmission of the vehicle from a reverse drive gear to a forward drive gear. The transmission includes a first clutch, a second clutch, a third clutch, and a fourth clutch. A transmission control module, in response to the command, maintains a first clutch in an engaged state, releases a second clutch and a fourth clutch, with the first clutch in the engaged state and the second clutch and the fourth clutch released, applies a third clutch with a synchronizer to engage the third clutch, and, after the third clutch is engaged, reapplies the fourth clutch to engage the fourth clutch.

主权项

1. A system for controlling a transmission of a vehicle, the transmission including a first clutch, a second clutch, a third clutch, and a fourth clutch, the system comprising:
an engine control module that generates a command, while the vehicle is rolling in either a forward or reverse direction, to change a transmission of the vehicle from a reverse drive gear to a forward drive gear; and a transmission control module that, in response to the command to change the transmission of the vehicle from the reverse drive gear to the forward drive gear:
maintains the first clutch in an engaged state;releases the second clutch and the fourth clutch;with the first clutch in the engaged state and the second clutch and the fourth clutch released, applies the third clutch with a synchronizer to engage the third clutch; andafter the third clutch is engaged, reapplies the fourth clutch to engage the fourth clutch and change the transmission of the vehicle from the reverse drive gear to the forward drive gear,wherein the second clutch is engaged only in the reverse drive gear and is not engaged in any forward drive gear.