Patent ID: 8315767
Filing Date: 2012-11-20
Classification: B60W,F16H,Y10T

Abstract:
1. A control device for a vehicular automatic transmission having a shift control unit operative such that (i) with an automatic shift mode set, a gear position in the automatic transmission is automatically switched within a range of a maximum shift-width based on a vehicle condition by referring to a preliminarily stored shifting diagram, and (ii) with a manual shift mode set, the gear position is switched to plural ranges, one by one for each manual shift operation of a shift operation device, in which low-speed side gear positions lower than an uppermost gear position in the maximum shift-width range is set as the uppermost gear position, the control device comprising: A high oil-temperature determining unit that determines whether temperature of a working-oil in the automatic transmission lies in a high oil-temperature state exceeding an oil-temperature determining value preliminary set; an accelerator-on drive determining unit that determines whether an accelerator-on drive is present with an accelerator pedal of the vehicle depressed; and an on-high oil-temperature down-range permitting unit that permits a down-range by the manual shift operation when the high oil-temperature determining unit determines presence of the high oil-temperature state and therefore the shifting diagram is switched to a high oil-temperature shifting diagram which is preliminarily set in a lower speed side lower than that of the shifting diagram and the accelerator-on drive determining unit determines presence of the accelerator-on drive state, the on-high oil-temperature down-range permitting unit permitting the down-range until the uppermost gear position in the range selected by the manual shift operation during the manual shift mode reaches a gear position determined based on the vehicle condition by referring to the high oil-temperature shifting diagram, and that does not permit a down-range by the manual shift operation when the high oil-temperature determining unit determines that the temperature of the working-oil does not lie in the high oil-temperature state or the accelerator-on drive determining unit determines that the accelerator-on drive is not present after the uppermost gear position reached a gear position determined based on the vehicle condition by referring to the high oil-temperature shifting diagram.