Patent ID: 8219291
Filing Date: 2012-07-10
Classification: B60W,F16H,Y10T

Abstract:
1. A method of controlling a vehicle having a transmission, a controller, and an auxiliary hydraulic pump, the method comprising: initiating an auto stop/start engine protocol; sensing an operational status of the auxiliary hydraulic pump; signaling, by the controller, the transmission to shift into a first gear ratio in preparation to launch the vehicle; sensing a gear ratio of the transmission after signaling the transmission to shift into the first gear ratio; disabling, by the controller, the auto stop/start engine protocol when the sensed gear ratio of the transmission is not equal to the first gear ratio and the auxiliary hydraulic pump is sensed to be operable; and implementing a diagnostic transmission shift control strategy to override a normal transmission shift control strategy to verify proper functionality of a mode control valve when the sensed gear ratio of the transmission is not equal to the first gear ratio and the auxiliary hydraulic pump is sensed to be operable; determining if the diagnostic transmission shift strategy is currently active when the sensed gear ratio of the transmission is equal to the first gear ratio of the transmission; continuing use of the diagnostic transmission shift strategy to maintain proper functionality of the mode control valve when the sensed gear ratio of the transmission is equal to the first gear ratio of the transmission and when the diagnostic transmission shift strategy is currently active; maintaining the normal transmission shift control strategy when the sensed gear ratio of the transmission is equal to the first gear ratio of the transmission and when the diagnostic transmission shift control strategy is not currently active.