Hyundai Motor Company

Kibeen Lim

Jaeduk Jang

Donghoon Park

Jae Dirk Jang

Doki Lim

A hydraulic control system of an automatic transmission for a vehicle includes a line pressure control part for converting line pressure from a hydraulic pump into constant hydraulic pressure. A torque pressure generating part converts the constant hydraulic pressure fed from the line pressure control part via a manual valve into torque pressure in accordance with the operation of a transmission control unit. A torque pressure switching part switches the supply direction of the torque pressure fed from the torque pressure generating parts in accordance with the operation of the transmission control unit. A shift part primarily feeds the torque pressure fed from the torque pressure switching part to friction members and secondly feeds drive pressure to the friction members after converting the line pressure fed from the line pressure control means into drive pressure.

System and method for controlling hydraulic pressure of an automatic

A hydraulic control system of a vehicle automatic transmission includes a torque converter, an oil pump, a pressure regulator, a damper clutch working control means, a manual valve, an N-D control valve, a torque control regulator valve, a control switch valve, a first to second, second to third, third to fourth, and third to second shift valves, a low/reverse clutch valve, a third clutch valve, and a second to fourth brake valve.

Hydraulic control system of an automatic transmission used in a vehicle

Disclosed is a hydraulic control system of an automatic transmission used in a vehicle, which comprises a torque converter for transferring the engine power to the input shaft of the transmission, an oil pump for pumping an oil by means of the engine power, a pressure regulation means for regulating the line pressure produced by the oil pump according to the forward and reverse drive and the amount of a throttle opening, a damper clutch working control means for changing the direction of the pressure delivered to the torque converter in order to increase the power transfer rate of the torque converter, a shift pressure control means for delivering the pressure supplied from the pressure regulation means to the first, second, third, fourth, fifth, sixth and seventh solenoid valves controlled on/off by a transmission control unit to adjust the control pressure during shifting operation, and a pressure distribution means for selectively distributing the pressure supplied from the pressure control means during shifting among the friction elements according to the shifting stages.

Disclosed is a hydraulic control system of an automatic transmission for a vehicle, which comprises an oil pressure regulating device for regulating the oil pressure of an oil pump, a manual/automatic shifting device for selecting a shifting mode, a pressure adjustment device for adjusting the hydraulic pressure to make a smooth shifting mode, a damper clutch control device for controlling the damper clutch of a torque converter, and a pressure distribution device for distributing the hydraulic pressure among the friction elements, wherein said pressure adjustment device further comprises an N-D control valve for supplying to the friction elements a duty-controlled hydraulic pressure produced by solenoid valves from the initial hydraulic pressure in the shifting from the neutral range to the drive range, said N-D control valve being switched to make the port change to provide the drive pressure, and a backward torque control regulator valve for making the port change by the duty-controlled hydraulic pressure in the shifting from the neutral range to the backward range so as to supply the backward pressure to the backward friction element.

Hydraulic control system of an automatic transmission for reducing a

Hydraulic control system for automatic transmission

Shift control device of a hydraulic control system for automatic

Hydraulic control system for 4-speed automatic transmission

A hydraulic control system of the present invention is provided for improving a responsiveness to a speed change by compleating the speed chang with a torque pressure control hydraulic pressure after initiating the speed change with the drive hydraulic pressure. The hydraulic control system includes an oil pump for generating hydraulic pressure, a pressure regulating valve for regulating the hydraulic pressure to be proper pressure for reverse and drive, five friction elements which receive the hydraulic pressure for drive in accordance with operation of a manual valve, two friction elements which receive the hydraulic pressure for reverse in accordance with operation of the manual valve, first and second shift control parts having at least two shift valves, respectively, to supply the hydraulic pressure to the friction elements, and a torque control hydraulic pressure regulating part for supplying a torque control hydraulic pressure to the first and second shift control parts.

Growing community of inventors

Kyungki-do, South Korea

Kibeen Lim