METHOD OF CONTROLLING A TRANSMISSION

摘要

A method of controlling a transmission includes selecting a target speed of a second shaft, and measuring a second speed of the second shaft and an output speed of an output shaft. The method includes detecting a rolling neutral condition wherein a first and second clutch are uncoupled from a torque generator and a synchronizer is mated to a predicted gear to apply a load in a direction, and one of a first condition wherein the output speed is decreasing and the target speed is less than the second speed and a second condition wherein the output speed is increasing and the target speed is less than the second speed. The method then includes translating the synchronizer away from the predicted gear, coupling and decoupling the second clutch to and from the torque generator, and mating the synchronizer to the predicted gear to again apply the load in the direction.

主权项

1. A method of controlling a transmission, wherein the transmission is coupled to a torque generator and has a first clutch connected to a first input shaft and configured for transmitting torque from the torque generator to a selected gear and an output shaft, a second clutch connected to a second input shaft and configured for transmitting torque from the torque generator to a predicted gear and the output shaft, and a synchronizer matable with the predicted gear, the method comprising:
selecting a target rotational speed of the second input shaft; measuring a second rotational speed of the second input shaft and an output rotational speed of the output shaft; detecting:
a rolling neutral condition in which: 'the first clutch and the second clutch are uncoupled from the torque generator such that the first clutch does not transmit torque from the torque generator to the first input shaft, and the second clutch does not transmit torque from the torque generator to the second input shaft; and
the synchronizer is mated to the predicted gear such that the synchronizer applies a load to the predicted gear in an initial loading direction; andone of:
a first operating condition in which the output rotational speed is decreasing and the target rotational speed is greater than the second rotational speed; anda second operating condition in which the output rotational speed is increasing and the target rotational speed is less than the second rotational speed; after detecting, translating the synchronizer away from the predicted gear such that the synchronizer is spaced apart from the predicted gear; after translating, coupling the second clutch to the torque generator without transmitting torque to the predicted gear; after coupling, decoupling the second clutch from the torque generator; and after decoupling, mating the synchronizer to the predicted gear to again apply the load in the initial loading direction.