초록 ▼

A lock-up clutch controller for the fluid coupling of an automotive automatic transmission, capable of making a lock-up clutch provided in the fluid coupling for directly coupling the input shaft and the output shaft of the fluid coupling engage or disengage smoothly responsive to an electric duty s

A lock-up clutch controller for the fluid coupling of an automotive automatic transmission, capable of making a lock-up clutch provided in the fluid coupling for directly coupling the input shaft and the output shaft of the fluid coupling engage or disengage smoothly responsive to an electric duty signal applied to a lock-up operation control solenoid valve. The lock-up clutch controller includes, as essential components, a lock-up clutch relay valve (a spool valve), a lock-up clutch control valve (a spool valve) and the lock-up operation control solenoid valve which operates in accordance with an electrical duty ratio signal to control the lock-up relay valve and the lock-up operation control valve so that the working fluid is supplied to the fluid coupling or the fluid coupling is drained appropriately for the smooth engagement and disengagement of the lock-up clutch. The torque of the lock-up clutch can be controlled so as to be increased or decreased gradually or maintained at a magnitude allowing slippage by applying a gradually variable electrical duty ratio signal to the lock-up operation control solenoid valve.

대표청구항 ▼

A control system for a lock-up clutch for a fluid coupling of an automotive automatic transmission, which clutch is provided in a casing for said fluid coupling and wherein said clutch is adapted to engage or disengage according to the pressure difference between a first working fluid pressure appli

A control system for a lock-up clutch for a fluid coupling of an automotive automatic transmission, which clutch is provided in a casing for said fluid coupling and wherein said clutch is adapted to engage or disengage according to the pressure difference between a first working fluid pressure applied through a first line to one surface of a clutch disk and a second, opposing, working fluid pressure applied through a second line to another surface of said clutch disk, the control system comprising: a source for fluid coupling pressure; a first spool valve including means for selectively connecting said fluid coupling pressure source to either said first line or said second line, for connecting said first line to a third line when said fluid coupling pressure source is in communication with said second line and for connecting said second line to a first drain line when said first line is in communication with said fluid coupling pressure source; a second spool valve including means for selectively connecting said third line to either said fluid coupling pressure source or to a second drain line; and hydraulic control means for controlling the positioning of said first spool valve and said second spool valve. A control system for a lock-up clutch for a fluid coupling of an automotive automatic transmission, which clutch is provided in a casing for said fluid coupling and wherein said clutch is adapted to engage or disengage according to the pressure difference between a first working fluid pressure applied through a first line to one surface of a clutch disk and a second, opposing, working fluid pressure applied through a second line to another surface of said clutch disk, the control system comprising: a source for fluid coupling pressure; a first spool valve including means for selectively connecting said fluid coupling pressure source to either said first line or said second line; a second spool valve for regulating said pressure difference by control of the hydraulic pressure within a third line which is selectively placed in fluid communication with said first line through said first spool valve; and an electromagnetic solenoid valve which generates a solenoid hydraulic pressure for control of said first spool valve over a first range of duty ratio and said second spool valve over a second range of duty ratio.