Hyundai Motor Company

Hyundai Motor Corporation

Jaeduk Jang

Kibeen Lim

Taekyun Kim

Donghoon Park

Doki Lim

Dokee Lim

A control valve includes a valve body having a first, second and third port, and a valve spool disposed in the valve body. The valve spool has a first and second end, and includes a first, second and third land. The first land is disposed at the first end for receiving hydraulic pressure supplied via the first port to bias the valve spool in a first direction. The second land allows fluid communication between the second and third ports when the valve spool is biased in the first direction, and the third land is disposed between the first and second land. The third land includes a passage which allows fluid communication between each side of the third land. A spring biased the valve spool in a second direction, opposite the first direction.

N-R control valve of a hydraulic control system for automatic

A hydraulic control system for an automatic transmission includes a pressure regulator to regulate hydraulic pressure produced by an oil pump; a manual and automatic shift controller to form shift modes; and a hydraulic pressure controller to regulate shift quality and responsiveness such that shift modes are smoothly formed during shifting. A damper clutch controller operates a damper clutch of a torque converter. A hydraulic pressure distributor supplies and distributes appropriate amounts of hydraulic pressure to friction members that operate as input and reaction members in each shift stage.

Hydraulic control system for automatic transmissions to improve shift

Disclosed is a hydraulic control system used in an automatic transmission for a vehicle which includes a plurality of friction elements associated with respective transmission speeds, a hydraulic pressure source, a hydraulic pressure regulating controller for controlling hydraulic pressure from the hydraulic pressure source to constant line pressure, a damper clutch controller for actuating a damper clutch of the torque converter by supplying hydraulic pressure fed from the pressure regulating controller to the torque converter, shift controller for selecting a shift mode by converting hydraulic pressure from the pressure regulating controller into drive pressure corresponding to each speed stage, a hydraulic pressure controller for controlling the drive pressure from the shift controller, and a hydraulic pressure distributor for suitably distributing hydraulic pressure from the hydraulic pressure controller to each friction element for each speed, wherein the hydraulic pressure distributor includes a shift timing control valve for supplying drive pressure to each friction element for second and fourth speeds, and a solenoid valve for controlling hydraulic pressure supply timing to said each friction element for the second and fourth speeds by exhausting control pressure for controlling the shift timing control valve in the fourth speed.

Automatic transmission hydraulic control system with solenoid-valve

A hydraulic control system of an automatic transmission for a vehicle which includes a pressure regulator for regulating hydraulic pressure created by an oil pump, manual and automatic shift controllers for forming a shift mode according to a position of a shift selection lever, a hydraulic controller for controlling shift quality and shift response to smoothly change transmission speeds when shifting, and a hydraulic pressure distributor and release mechanism which distributes an appropriate amount of hydraulic pressure to and releases pressure from each of the friction elements in the automatic transmission, A hydraulic distribution and release device has a 2-4/3-4 shift valve, a 2-3/4-3 shift valve, and an end-clutch valve for supplying to or releasing from friction elements hydraulic pressure. The preasure is controlled by first and second pressure control valves of the hydraulic pressure controller, through port conversion realized by control pressure, and supplied to lines for each speed through a shift control valve operated according to ON/OFF states of solenoid valves by a transmission control unit. The 2-3/4-3 shift valve is connected to a line to which an exhaust port provided with an orifice is installed.

Hydraulic control system of an automatic transmission for a vehicle and

A hydraulic control system for an automatic transmission used in a vehicle, the hydraulic control system includes a pressure regulating part for regulating hydraulic pressure generated from a hydraulic pump to constant line pressure, a manual valve selectively supplying hydraulic pressure to a drive pressure passage, a reverse pressure passage, and a first and a second speed pressure passage. A pressure control part supplies standard pressure to solenoid valves which are duty-controlled by a transmission control unit. The pressure control part has a solenoid supply valve. A damper clutch control part controls a damper clutch of a torque converter. A pressure distributing part distributes an appropriate amount of pressure to friction members, and has shift valves and clutch valves. A torque pressure generating part reduces the line pressure so that it can be used for initial shifting control. A pressure compensating device compensates hydraulic pressure by elastically storing the standard pressure when the hydraulic pressure fed to the torque pressure generating part, the pressure regulating part, and the damper clutch control part is reduced, the pressure compensating device being connected to the pressure control part.

Hydraulic control system of automatic transmission for automotive vehicle

A device and a method of a hydraulic control system for 4-speeds automatic transmissions which may reduce line pressure in a steady flow during operation of an automotive vehicle at high speed thereby decreasing the load applied to an oil pump and reducing fuel consumption. And when shifting from the second, third or fourth speed of the 'D' range, where the damper clutch operates, to another shift range, which makes it so the line pressure is not changed when the damper clutch is released thereby increasing the load applied to the engine, thereby preventing the run-up of the engine, and when the shift is completed, which changes the line pressure again, thereby improving shift quality and power transmission efficiency.

Device and method for controlling line pressure of hydraulic control

A hydraulic control system of an automatic transmission for a vehicle comprises a pressure regulator means changing hydraulic pressure supplied from an oil pump, a torque pressure changing/supplying device changing line pressure supplied from the pressure regulator into a torque pressure and supplying it, a shift controller supplying the hydraulic pressure through a drive pressure line in D range and through a rear pressure line in R range, a hydraulic pressure distributing device selecting and supplying the hydraulic pressure supplied from the shift controller by the control of the solenoid valves to the first, second, third, fourth, fifth, sixth, seventh friction members, and a plurality of accumulators disposed on the first, fourth, and seventh friction members.

Hydraulic control system of an automatic transmission for a vehicle

A hydraulic control system for automatic transmission systems includes: an oil pump, a pressure control valve, a solenoid supply valve, a manual valve, a torque control regulator valve, a control switch valve, an N-D control valve, a 1st-2nd speed shift valve, a 2nd-3rd speed shift valve, a 3rd-4th speed shift valve, a second clutch valve, a third clutch valve, a fourth clutch valve, and an N-R control valve. Accumulators are provided to each supply line of first, second, third and sixth frictional elements to alleviate shock resulting from gear shifting and maintain stability in actuating hydraulic pressure.

Hydraulic control system for automatic transmission system

A hydraulic control system for an automatic transmission includes a hydraulic pump, a pressure regulating valve, a solenoid supply valve, a manual valve, a torque control regulator valve, a control switching valve, a N-D control valve, a 1-2 shift valve, a 2-3 shift valve, a 3-4 shift valve, and a N-R control valve. Accumulators are disposed in conduits to first and seventh friction members for reducing shift shock caused by line pressure and drive pressure fed from fourth and second clutch valves.

Hydraulic control system for automatic transmission of automotive

A pressure regulating portion having a pressure regulating valve regulates hydraulic pressure fed from a hydraulic pump and a shift control part having a manual valve and a shift control valve feeds hydraulic pressure fed from the pressure regulating portion in response to each shift mode. A pressure control portion controls hydraulic pressure to be proper to each shift mode. The pressure control part includes first and second pressure control solenoid valves, and first and second pressure control valves and an N-R control valve. A pressure dispensing part dispenses hydraulic pressure fed from the shift control part and the pressure control part to first, second, third, fourth and fifth friction members. A switch valve feeds selectively hydraulic pressure fed from the second pressure control valve to the first and fourth friction members. A pressure damping member is disposed on a line connected to the third friction member which is applied in third and fourth speeds of a drive 'D' range. A first release pressure retarding member is disposed on a release pressure line of the fifth friction member and a second release pressure retarding member is disposed on a line connecting the first pressure control valve to the first-to-second speed shift valve.

Hydraulic control system for automatic transmissions

Disclosed is the hydraulic control system of an automatic transmission for a vehicle which can effectively control a power train even though all of one-way clutches is omitted to simplify the power train structure, including a hydraulic pump which is operated by power of an engine to produce a line pressure; a manual valve cooperating with a shift selector lever; a torque converter control part; a pressure regulator part for regulating the line pressure, the pressure regulator part being controlled in accordance with ON/OFF operations of solenoid valves; a pressure control part which is controlled by the line pressure from the pressure regulator part to thereby control a flow of a hydraulic pressure fed from the manual valve; and a shift control part for selectively feeding the hydraulic pressure fed from the pressure control part to each friction member.

Hydraulic pressure control system of an automatic transmission for

In a hydraulic control system for automatic transmissions of a vehicle, drive pressure is fed to a first friction member at the first, second and third speeds of a 'D' range, drive pressure is fed to a third friction member at a fourth speed, a 2-4/3-4 shift valve for exhausting pressure from the first friction member at third-to-fourth and second-to-fourth speed shifting is connected to an end clutch valve to allow pressure from a first pressure control valve to be fed to the third friction member at the fourth speed, and exhausting of pressure from a releasing conduit of a second friction member and the third friction member via an exhaust conduit connecting the 2-4/3-4 shift valve and a 2-3/4-3 shift valve during fourth-to-second, fourth-to-first and third-to-second speed shifting is delayed by an orifice.

Hydraulic control system for four-speed automatic transmission of

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

If there is a need to accelerate abruptly, or shift a speed stage from a fourth speed stage to a second speed stage, to accomplish a skip shift from the fourth speed stage to the second speed stage without going via a third speed stage and, therefore, enhance the shift-responsiveness and the power performance, a high-low pressure valve which is connected to a fourth friction pressure line in the third and fourth speed stages is duty controlled by a damper clutch solenoid valve to vary a line pressure in a pressure regulating valve with the operation of a damper clutch, and a shift valve is controlled to a drive pressure passage and a third speed line pressure by controlling a first and second pressure control solenoid valves to enable the skip shift, and by supplying a first friction element with the operation pressure at times of the second to the third speed stage shifting, after the shifting to the third speed stage, when the operation pressure for the fourth friction element is supplied to a releasing valve for the fourth friction element, the operation pressure of the first friction element is exhausted.

Hydraulic control system of a 4-speed automatic transmission for vehicles

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.

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Kyungki-do, South Korea

Jaeduk Jang