Patent ID: 9328820
Filing Date: 2016-05-03
CPC Classification: F16H

Claim Text:
1. A method for detecting a malfunctioning shift element in an automatic transmission, comprising: terminating a power flow from the automatic transmission; operating the automatic transmission in an intermediate gear after said step of terminating, a selected shift element of the automatic transmission being commanded to a disengaged configuration when the automatic transmission is in the intermediate gear; measuring a gear ratio of the automatic transmission in the intermediate gear; determining whether the selected shift element of the automatic transmission is malfunctioning based at least in part on the gear ratio of the automatic transmission in the intermediate gear; and shifting the automatic transmission to a subsequent gear if the selected shift element of the automatic transmission is not malfunctioning at said step of determining or continuing to operate the automatic transmission in the intermediate gear if the selected shift element of the automatic transmission is malfunctioning at said step of determining.