Patent ID: 7935024
Filing Date: 2011-05-03
Classification: B60W,F16H,Y02T,Y10S,Y10T

Abstract:
1. A method of operating an automatic transmission of a motor vehicle having a clutch located between a drive motor and the transmission, the method comprising the steps of: disengaging the clutch, if engaged, and initiating a first downshift operation only when the vehicle is currently coasting; shifting from a first, higher transmission gear ratio to a second, lower transmission gear ratio during coasting while the clutch is disengaged: completing the first downshifting operation by engaging the clutch if a speed of the vehicle is above a predetermined threshold speed greater than zero determined by the second transmission gear ratio; or completing the first downshifting operation while maintaining the clutch in a disengaged state if the speed of the vehicle is below the predetermined threshold speed.