Patent ID: 8715135

Claim:
A control device for a hybrid vehicle automatic transmission mounted on a hybrid vehicle that includes a rotary electric machine and an internal combustion engine each serving as a drive source and that allows power of the internal combustion engine to be transferred to wheels via an automatic transmission and allows wheels to be driven by the rotary electric machine with the internal combustion engine stopped, the automatic transmission including an electric oil pump and a mechanical oil pump driven by power of the internal combustion engine each serving as a hydraulic pressure source, in which a hydraulic pressure from the hydraulic pressure source is regulated by a pressure regulation valve to be supplied to a hydraulic servo for a predetermined friction engagement element of the automatic transmission, the control device for a hybrid vehicle automatic transmission comprising: a friction engagement element control unit that controls the pressure regulation valve in engaging the predetermined friction engagement element so as to perform play elimination of the predetermined friction engagement element at a play elimination pressure, at which a piston for the predetermined friction engagement element is moved from an attachment position to a state immediately before the predetermined friction engagement element provides a torque capacity, and thereafter gradually increase the hydraulic pressure from the play elimination pressure, wherein: the friction engagement element control unit includes a first play elimination control unit that sets a first play elimination pressure as the play elimination pressure for a first set time in the case where the predetermined friction engagement element is engaged using a hydraulic pressure from the electric oil pump in a travel state in which only the rotary electric machine serves as a drive source; the first play elimination pressure is lower than a play elimination pressure for use in the case where the predetermined friction engagement element is engaged using a hydraulic pressure from the mechanical oil pump in a travel state in which the internal combustion engine serves as a drive source; and the first set time is longer than a set time for which the play elimination pressure is set in the case where the predetermined friction engagement element is engaged using a hydraulic pressure from the mechanical oil pump in a travel state in which the internal combustion engine serves as a drive source.