Patent ID: 7189188

Claim:
A transmission control device including a frictional coupling element and a lockup clutch of a hydraulic transmission device, which are provided on a driving-power transmitting path between an engine and a driving wheel and adaptive respectively to control a slip state between an input element and an output element thereof, comprising: first control means for controlling a slip state of the frictional coupling element; second control means for controlling a slip state of the lockup clutch; driving condition detecting means for detecting a driving condition of a vehicle; classification means for classifying the vehicle driving condition detected by said driving condition detecting means into a region; determination means for determining when the vehicle is not at a gear shift timing; and association control means for executing a control to associate said first control means with said second control means according to a classification result by said classification means, when it is determined by said determination means that the vehicle is not at the gear shift timing, wherein said association control means control said fIrst control means so as to make the frictional coupling element in a slip state and control said second control means so as to make the lockup clutch in a lockup state, when the vehicle driving condition is classified into a first region by said classification means, said first region correspondintto a vehicle driving condition where an engine load is lower than a specified engine load in a relatively low-load area and a vehicle speed is lower than a specified vehicle speed in a relatively low-speed area, and said association control means control said first control means so as to make the frictional coupling element in the slip state and control said second control means so as to make the lockup clutch in a converter state, when the vehicle driving condition is classified into a third region by said classification means, said third region corresponding to a vehicle driving condition where the engine load is higher than a specified engine load in a relatively high-load area and the vehicle speed is lower than the specified vehicle speed in the relatively low-speed area.