초록 ▼

A slip control system for an automatic transmission includes a fluid coupling including a release side oil chamber, an apply side oil chamber and a lockup clutch unit that is applied and released on an basis of the oil pressure that is fed to at least one of the release side oil chamber and the appl

A slip control system for an automatic transmission includes a fluid coupling including a release side oil chamber, an apply side oil chamber and a lockup clutch unit that is applied and released on an basis of the oil pressure that is fed to at least one of the release side oil chamber and the apply side oil chamber; an oil pressure generating unit for generating the oil pressure; a vehicular running state detecting unit for a detecting vehicular running state; an electronic control unit for determining whether a slip control is to be made, on the basis of a determination upon whether the present vehicular running state, as detected by the vehicular running state detecting unit, belongs to a predetermined slip control region; and an oil pressure regulating unit for regulating the oil pressure in response to a signal coming from the electronic control unit, to make the slip control by sliding the lockup clutch unit. The electronic control unit determines the state of a heat, as generated according to the slip control; and changes the slip control region on the basis of the heat state.

대표청구항 ▼

[ What is claimed is:] [1.] A slip control system for a lockup clutch unit of a torque converter, acting as a fluid coupling, of an automatic transmission, comprising:the fluid coupling including a release side oil chamber, an apply side oil chamber and the lockup clutch unit that is applied and rel

[ What is claimed is:] [1.] A slip control system for a lockup clutch unit of a torque converter, acting as a fluid coupling, of an automatic transmission, comprising:the fluid coupling including a release side oil chamber, an apply side oil chamber and the lockup clutch unit that is applied and released by an oil pressure that is fed to at least one of said release side oil chamber and said apply side oil chamber;an oil pressure generating unit for generating said oil pressure;a vehicular running state detecting unit for detecting a vehicular running state;an electronic control unit for determining whether a slip control of the lockup clutch unit is to be made on the basis of a determination whether a present vehicular running state, as detected by said vehicular running state detecting unit, falls within a predetermined slip control region wherein a friction member attached to a clutch plate of the lockup clutch unit slides relative to a cover of the torque converter; andan oil pressure regulating unit for regulating said oil pressure in response to a signal coming from said electronic control unit, to provide the slip control by slippage of the lockup clutch unit,wherein said electronic control unit includes:state determining means for determining a heated state of the lockup clutch unit, as generated according to the slip control by the slippage of the lockup clutch unit; andslip control region changing means for reducing the slip control region when it is determined by said state determining means that the lockup clutch unit is in an overheated state.