Patent Number: 6,167,996

Title: Method and system for determining clutch status in a vehicle

Abstract: 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.

Inventors: Huber; Jon M. (Laurinburg, NC), Bockmann; Gerhard (Laatzen, DE), Bohm; Andreas (Wennigsen, DE)

Assignee: ZF Meritor, LLC

International Classification: F16H 61/02 (20060101); F16H 59/42 (20060101); F16H 59/36 (20060101); F16H 59/46 (20060101); F16H 059/56 ()

Expiration Date: 01/02/2018