초록 ▼

A shift by wire vehicle transmission system includes control methods that are especially useful for controlling the transmission under start-from-stop conditions. Since the master clutch must be manually operated under such conditions, the invention includes a method of determining whether the clutc

A shift by wire vehicle transmission system includes control methods that are especially useful for controlling the transmission under start-from-stop conditions. Since the master clutch must be manually operated under such conditions, the invention includes a method of determining whether the clutch is open or closed. The rotational speed of the engine output shaft is compared to the rotational speed of the transmission input shaft and if the difference between those speeds is greater than a preselected value, the clutch is determined to be open. Another use of the disclosed method is to provide an indication to the driver whether a desired gear has been engaged. A visual or audible signal indicates to the driver that the desired gear is not yet engaged. Once engagement is confirmed, the signal is turned off and the driver knows that the desired shift has been accomplished.

대표청구항 ▼

[ We claim:] [1.] A method of determining the status of a clutch selectively coupling an engine output shaft and a transmission input shaft, comprising the steps of:(A) determining a rotation speed of the engine output shaft;(B) determining a rotation speed of the transmission input shaft;(C) determ

[ We claim:] [1.] A method of determining the status of a clutch selectively coupling an engine output shaft and a transmission input shaft, comprising the steps of:(A) determining a rotation speed of the engine output shaft;(B) determining a rotation speed of the transmission input shaft;(C) determining a difference between the speeds from step (A) and (B);(D) determining whether the clutch is open by determining when the difference from step (C) is above a pre-selected value that is at least in part based upon a rate of change of the engine output shaft speed over time.