Control apparatus for vehicular automatic transmission

摘要

A control apparatus for a vehicular automatic transmission configured to selectively establish a plurality of shift positions by respective combinations of frictional coupling devices of a plurality of frictional coupling devices in an engaged state thereof, with output hydraulic pressures of respective ones of a plurality of solenoid valves provided in a hydraulic control circuit, includes a fail-safe control portion configured to perform a predetermined fail-safe function when shifting direction values requiring a shifting control of said vehicular automatic transmission and shifting output values respectively generated according to said shifting direction values are not coincident with each other, said shifting output values being represented by respective electric signals for driving said plurality of solenoid valves.

主权项

1. A control apparatus for a vehicular automatic transmission configured to selectively establish a plurality of shift positions by respective combinations of frictional coupling devices of a plurality of frictional coupling devices in an engaged state thereof, with output hydraulic pressures of respective ones of a plurality of solenoid valves provided in a hydraulic control circuit, comprising:
a shift control portion configured to implement a shifting control of said vehicular automatic transmission, a fail-safe control portion configured to perform a predetermined fail-safe function when shifting direction values requiring said shifting control of said vehicular automatic transmission and shifting output values respectively generated according to said shifting direction values are not coincident with each other, said shifting output values being represented by respective electric signals for driving said plurality of solenoid valves, said fail-safe control portion performing said predetermined fail-safe function in a case that the shifting direction values and the shifting output values are not coincident each other by commanding said shift control portion to implement a shifting action of the vehicular automatic transmission to one of the shift positions, using an engaging action of the frictional coupling device which takes place with an output hydraulic pressure of one of said solenoid valves which corresponds to one of said shifting output values which is not coincident with the corresponding shifting direction value, in a case that all shifting actions from the shift position to be established when said shifting direction values and said shifting output values are coincident to each other, to said plurality of the shift positions to be established using the engaging action of the frictional coupling device which takes place with the output hydraulic pressure of one of said solenoid valves which corresponds to one of said shifting output values which is not coincident with the corresponding shifting direction value are shift-down actions, the shifting action to said one of the shift positions to be established when said predetermined fail-safe function is performed being a shift-down action causing a lowest stepping change between speed ratios of the shifting, and in a case that the shifting actions from the shift position to be established when said shifting direction values and said shifting output values are coincident to each other, to said plurality of the shift positions to be established using the engaging action of the frictional coupling device which takes place with the output hydraulic pressure of one of said solenoid valves which corresponds to one of said shifting output values which is not coincident with the corresponding shifting direction value are both a shift-up action and a shift-down action, the shifting action to said one of the shift positions to be established when said predetermined fail-safe function is performed being a shift-up action.