KR19980036511A - Hydraulic Control System for Automatic Transmission - Google Patents

Abstract

In order to increase fuel efficiency and increase the ease of setting the duty pattern in the case of controlling the friction element by changing the control pressure in the duty control section, it is supplied to the manual valve through the oil pump and through the hydraulic pipe through the manual valve. In the hydraulic control system for automatic transmission, in which the pressure is adjusted by returning the oil pressure above the certain pressure by returning oil pressure to the regulator valve, the oil pressure introduced by the manual valve is connected to the reverse speed and 1 speed pipeline to regulate the pressure. A regulator valve that controls pressure so that the line pressure drawn into the shift control solenoid valve has a different pressure at each speed range and driving range, and the hydraulic pressure drawn through the manual valve are 2 speed, 3 speed, The hydraulic pressure introduced through the 4-speed pressure pipe line is connected to the regulator valve Connection is to provide a hydraulic control system for an automatic transmission that includes a shift control valve so that each of the pressure control conducted.

Description

Hydraulic Control System for Automatic Transmission

The present invention relates to a hydraulic control system for an automatic transmission, and more particularly, to a hydraulic control system for an automatic transmission that increases fuel efficiency and facilitates control.

In general, the automatic transmission has a torque converter and a multistage shift mechanism connected to the torque converter, and a hydraulically operated friction element for selecting one of the gear stages of the transmission gear mechanism according to the driving condition of the vehicle. It includes. The hydraulic control system of the automatic transmission for a vehicle operates the hydraulic pressure generated from the oil pump through a control valve to select and operate a friction element so that an appropriate shift can be automatically performed according to the driving state of the vehicle. The hydraulic control system includes a pressure regulating means for regulating the hydraulic pressure generated from the oil pump, a manual and automatic shift control means for forming a shift mode, and a shift feeling and responsiveness for a smooth shift mode during shifting. Hydraulic control means, damper clutch control means for actuating the damper clutch of the torque converter, and hydraulic distribution means for distributing a proper hydraulic supply to each friction element. The pressure adjusting means returns a part of oil pressure to the regulator valve when the oil pressure generated by the oil pump is transferred to each friction element through the hydraulic distribution means via the manual valve, and the oil is returned according to the strength of the returned pressure. It is made of a structure that controls the pressure by adjusting the amount. The regulator valve is typically formed in a structure in which a pressure different from each shift stage of the reverse speed and the driving range is applied. This is because the forward and reverse speeds act as different friction elements, so the pressure required for control is also different.

However, the regulator valve of the conventional hydraulic control system for an automatic transmission has a structure in which the same hydraulic pressure acts at each shift stage in the forward range. This is because the friction factor that acts even at the angular speed of the driving range is different, it is possible to shift to the optimum state when the appropriate pressure must be input. However, in the conventional regulator valve, the fuel consumption efficiency is reduced by supplying unnecessary line pressure by supplying a constant line pressure in the driving range, and also reducing friction elements by varying the control pressure in a fixed state in the duty control section. In the case of controlling, it is difficult to set the duty pattern, which makes it difficult to control the friction element with stable control pressure.

Therefore, the present invention creates the problems of the prior art described above, an object of the present invention is to increase the fuel efficiency, and to increase the ease of setting the duty pattern when controlling the friction elements by varying the control pressure in the duty control section. To provide a hydraulic control system for an automatic transmission.

In order to achieve the above object of the present invention, the oil pressure is supplied to the manual valve through the oil pump and the hydraulic pressure is introduced into the regulator valve through the hydraulic pipe through the manual valve to return the oil pressure above a certain pressure to the oil pan to control the pressure. In the hydraulic control system for automatic transmission, the hydraulic pressure drawn into the manual valve is connected to the reverse speed and the 1-speed pipeline to adjust the pressure, and the line pressure introduced to the shift control solenoid valve is used for each speed of each shift stage and driving range. The regulator valve is pressure-controlled to have different pressures from the hydraulic valve, and the hydraulic pressure introduced through the manual valve is connected to the regulator valve through the 2-speed, 3-speed and 4-speed pressure pipes. Oil for automatic transmission, including shift control valves, for adjustment Provides a pressure control system.

1 is a hydraulic circuit diagram showing an embodiment according to the present invention;

2 is an enlarged cross-sectional view of the regulator valve of FIG. 1 according to an embodiment of the present invention;

3 is an enlarged cross-sectional view of the shift control valve of FIG. 1 according to an exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1 is a hydraulic circuit diagram showing an embodiment according to the present invention, showing a hydraulic control system with a shift lever selected to the neutral range.

The hydraulic control system includes a torque converter (2) located between the crankshaft of the engine and the transmission to transmit power; An oil pump (4) installed in the pump drive hub of the torque converter (2) and having a drive gear that rotates together and a driven gear geared to the drive gear; A pressure adjusting unit (A) for converting a constant pressure to control a friction element by hydraulic pressure generated by the oil pump (4); A damper clutch control unit (B) for varying the hydraulic pressure generated by the oil pump (4) to operate / deactivate the damper clutch of the torque converter (2); Manual valve (C) for receiving the hydraulic pressure of the pressure adjusting unit (A) in connection with the shift lever to implement a predetermined shift stage at the driver's will to deliver to each friction element; A friction element part (D) which is selectively operated by hydraulic pressure supplied from the pressure adjusting part (A) and hydraulic pressure supplied through a manual valve (C); The friction element control unit (E) for duty supply of the line pressure from the oil pump (4) or the drive pressure through the manual valve to the friction element portion (D) by the transmission control unit to selectively supply to the friction element Is done.

The pressure regulating portion A is composed of a regulator valve 6 capable of appropriately varying the line pressure on the discharge port side of the oil pump 4. This regulator valve 6 is connected to the torque converter control valve 10 of the damper clutch control part B via the hydraulic conduit 8, and controls the torque converter 2. As shown in FIG. And the manual valve (C) is connected to the conduit 12 so that the line pressure discharged from the oil pump can be drawn directly. The manual valve (C) is configured to be connected to the shift control valve (14) and the hydraulic line in the running range to supply the hydraulic pressure. In addition, the line pressure drawn into the manual valve C in the reverse range, the running range, and the neutral range is controlled to a constant pressure, and is configured to be connected to the regulator valve 6 by a pipe. In addition, the above-described shift control valve 14 is made of a structure that is connected to the regulator valve 6 through each hydraulic pipe so that each pressure control at each shift range of the driving range can be made.

FIG. 2 is an enlarged cross-sectional view of a regulator valve according to the present invention, and includes a first port 101 to which hydraulic pressure discharged from the oil pump 4 is supplied, and one side of the first port 101. The second port 103 through which the hydraulic pressure introduced into the one port 101 is discharged to the oil pan 20, the third port 105 connected to the reverse line pressure line of the manual valve C, and the manual described above. The fourth port 107 connected to the one-speed pressure line of the valve C and the line pressure is introduced therein, and the fifth port 109 to the line pressure to be introduced into the traveling range two-speed pressure line of the shift control valve 14. ), The sixth port 111 into which the line pressure drawn into the travel range three-speed pressure pipeline of the shift control valve 14 is input, and the line pressure drawn into the travel range four-speed pressure pipeline of the shift control valve 14. To the seventh port 113 where the oil is drawn in and the hydraulic pressure introduced into the first port 101 described above. A valve body 117 including an eighth port 115 for drawing into the converter control valve 10; The first land 121 is slidably interposed inside the valve body 117 and adjusts the amount of hydraulic pressure introduced into the eighth port 115 when the hydraulic pressure introduced into the first port 101 is introduced into the eighth port 115. And a second land 123 disposed to be spaced apart from the first land 121 by a predetermined distance, for selectively opening and closing the first port 101 and the second port 103, and the second land. The third land 125 is disposed to be spaced apart from the land 123 by a predetermined distance and the hydraulic pressure introduced into the third port 105 acts apart from the third land 125 by a predetermined distance. The fourth land 127 and the fourth land 127, which are disposed and have a smaller cross-sectional area in which hydraulic pressure acts than the third land 125, and in which pressure of hydraulic pressure introduced into the fourth port 107 acts. And spaced apart a predetermined distance from the fourth land 127 has a smaller cross-sectional area in which the hydraulic pressure acts and the pressure of the hydraulic pressure introduced into the fifth port 109 The fifth land 129 and the fifth land 129 are spaced apart from each other by a predetermined distance and have a smaller cross-sectional area in which hydraulic pressure acts compared to the fifth land 129, and the sixth port 111 is inserted therein. The sixth land 131 to which the hydraulic pressure acts, and the sixth land 131 are disposed at a predetermined distance apart from each other, and the cross-sectional area in which the hydraulic pressure acts is smaller than that of the sixth land 131. A valve spool 135 formed of a seventh land 133 on which the hydraulic pressure of the port 113 is applied; Pressure inside the valve body 117 is disposed on the valve spool 135 to act on the third, fourth, fifth, sixth, seventh lands 125, 127, 129, 131 and 133. An elastic member 137 disposed on one side of the first land 121 so as to face the valve spool 117; In order to adjust the elastic force of the elastic member 137 to an appropriate strength, the elastic member elastic force adjusting unit 139 is fixed to one end of the elastic member 137.

3 is an enlarged cross-sectional view of a shift control valve according to the present invention, and includes a first port 201 through which a line pressure is introduced through a manual valve C and a line introduced through the first port 201. The second port 203 connected to the fifth port 109 of the regulator valve 6 and the line pressure introduced into the first port 201 are maintained in order to maintain the pressure in the traveling range 2 speed. In order to maintain a constant pressure in the traveling range 3 speed, the third port 205 connected to the sixth port 111 of the regulator valve 6 and the line pressure introduced into the first port 201 are used in the traveling range. A fourth port 207 connected to the seventh port 113 of the regulator valve 6 to maintain a constant pressure at the fourth speed, and the second, third and fourth ports 203, 205 and 207 described above. The discharge port 209 for selectively discharging the hydraulic pressure introduced into the pump and the second, third and fourth speed line pressures, and the line pressure introduced into the first port 201 shift The fifth port 211 is formed to selectively control the angular shift of the travel range by the troll solenoid valve, and the sixth port 213 is used to control the travel range 4 speeds of the line pressure introduced into the first port 201. ), And the seventh port 215 for controlling the driving range 3 speed using the line pressure drawn into the first port 201, and the second driving line pressure for controlling the driving range 2 speed with the line pressure introduced into the first port 201. Hydraulic port introduced into the ninth port 219 and the ninth port 219 to be controlled by the line pressure shift control solenoid valve introduced into the first port 201. The tenth port 221 to be selectively inputted by the shift control solenoid valve and the eleventh port 223 to be selectively inputted by the shift control solenoid valve to the hydraulic pressure introduced into the ninth port 219. A valve body 225 formed of; The second and eight ports 203 and 217 and the second, eight, three and seven ports 203, 217, 205 and 215 are arranged on the valve body 225 so as to be slidable. 2, 8, 3, 7, 4, 6 ports (203) (217) (205) (215) (207) (211) selectively communicate with land (231) for controlling each shift stage in the driving range. A valve spool 233 including; A first plug 235 slidably disposed at one end of the valve body 225 and controlled by a shift control solenoid valve; A second plug 237 installed at the other end of the valve body 225 where the first plug 235 is installed and controlled by a shift control solenoid valve; A first stopper 239 installed at the tenth port 221 side of the valve body 225 to limit movement of the first plug 235; The valve body 235 has a structure including a second stopper 241 provided on the discharge valve 209 side to restrict the movement of the second plug 237.

The friction element portion D is composed of a plurality of friction elements, and by selectively controlling the friction elements, the change of the shift stage of each range is realized. And the friction element control unit (E) is composed of a plurality of hydraulic valves for selectively controlling the friction element of the friction element unit (D), these valves are the hydraulic pressure discharged through the oil pump (4) manual valve The friction element is controlled according to the movement of the valve spool which is transmitted via (C) and the shift control valve 14 and disposed in each valve.

As a function of the regulator of the hydraulic control system for an automatic transmission, the line pressure discharged from the oil pump 4 is introduced into the manual valve C in the neutral range, and the line pressure introduced into the manual valve C is The fourth port 107 is introduced into the regulator valve 6 to pressurize the fourth land 127. Then, the valve spool 135 is moved to the left side to communicate the first port 101 and the second port 103. Therefore, as the hydraulic pressure introduced into the first port 101 is discharged to the second port 103, the pressure adjusting action is performed.

And the pressure control action in the reverse range is to move the shift lever (not shown) to the reverse state, the valve spool of the manual valve (C) moving in conjunction with the shift lever is moved. Therefore, the line pressure discharged through the oil pump 4 is introduced into the third port 105 of the regulator valve 6 through the manual valve C. Then, the third land 125 of the regulator valve 6 is pressed to communicate with the first port 101 and the second port 103 so that a pressure regulating action is performed as described in the neutral range.

In the traveling range, when the shift lever is moved to the traveling range position, the valve spool of the manual valve C linked thereto is moved to the traveling range state. Then, in the driving range 1 speed, the pressure control action occurs in the same manner as the neutral range, and in the driving range 2 speed, the shift control solenoid valve acts to open the second port 203 and the eighth port 217 of the shift control valve 14. do. Therefore, the line pressure transmitted from the manual valve C is introduced into the eighth port 217 and simultaneously into the second port 203 and into the fifth port 109 of the regulator valve 6. Then, the hydraulic pressure introduced into the fifth port 109 in the state in which the pressure adjustment acting in the neutral and the driving range 1 is made to press the fifth land 129 of the regulator valve 6. Then, the opening of the first port 101 and the second port 103 of the regulator valve 6 is further increased, and the line pressure flowing into the first port 101 is returned to the oil pan, which is relatively lower than the first speed pressure. The friction element can be controlled by the action of the line pressure.

In the driving range 3 speed, the land 231 formed in the valve spool 233 of the shift control valve is formed by the action of the shift control solenoid valve, so that the third port 205 and the seventh port 215 of the shift control valve 14 are formed. ) Will open. Then, the line pressure drawn into the third port is introduced into the sixth port 111 of the regulator valve 6 to pressurize the sixth land 131 to act in the same manner as described in the second speed, thereby adjusting the pressure.

Further, in the driving range 4 speed, the valve spool 233 of the shift control valve 14 is moved by the action of the shift control solenoid valve controlled by the transmission control unit, and the land 231 fixed to the valve spool 233 is moved. By this, the fourth port 207 and the sixth port 213 are opened. Therefore, the line pressure drawn into the fourth port 207 is drawn into the seventh port 113 of the regulator valve 6 to pressurize the seventh land 133 of the regulator valve 6 to adjust the pressure as described above. The action will be made.

In the hydraulic control system for an automatic transmission according to the present invention, the respective pressure control action is made at each speed change stage can improve the fuel economy by reducing the power loss generated by increasing unnecessary pressure, the duty control By setting the duty value of the valve to a different pressure for each shift stage, the duty control is performed, thereby increasing the accuracy of the duty control and increasing the ease of setting the duty pattern.

Claims (4)

In the hydraulic control system for an automatic transmission which is supplied to the manual valve through the oil pump, the hydraulic pressure is introduced into the regulator valve through the hydraulic pipe through the manual valve, and the hydraulic pressure above a certain pressure is returned to the oil pan. Hydraulic pressure introduced by manual valve is connected to reverse speed and 1 speed pipeline to adjust the pressure, and the pressure is adjusted so that the line pressure introduced to the shift control solenoid valve has different pressure at each speed of each shift stage and driving range. With a regulator valve, Hydraulic control for automatic transmission including a shift control valve so that the hydraulic pressure introduced through the manual valve is connected to the regulator valve and the hydraulic valve introduced through the 2-speed, 3-speed and 4-speed pressure pipes, respectively, to control the pressure. system. The method of claim 1, wherein the first port to which the hydraulic pressure discharged from the oil pump is supplied, the second port disposed on one side of the first port and the hydraulic pressure introduced into the first port is discharged to the oil pan, and the manual valve The third port connected to the reverse line pressure line, the fourth port connected to the one-speed pressure line of the manual valve described above, and the line pressure drawn into the traveling range two-speed pressure line of the shift control valve A seventh port comprising a fifth port formed therein and a line pressure introduced into a traveling range three-speed pressure pipeline of the shift control valve and a seventh port drawn into a traveling range four-speed pressure pipeline of the shift control valve A valve body including a port and an eighth port for drawing hydraulic pressure introduced into the first port into the torque converter control valve; A first land for slidably interposing the inside of the valve body and adjusting the amount of the hydraulic pressure when the hydraulic pressure introduced into the first port into the eighth port, and a predetermined distance from the first land. A second land disposed to be spaced apart to selectively open and close the first port and the second port, and a third spaced apart from the second land by a predetermined distance and acting on a hydraulic pressure introduced into the third port A land, spaced apart from the third land by a predetermined distance, and having a smaller cross-sectional area in which hydraulic pressure acts compared to the third land, and a fourth land in which the hydraulic pressure introduced into the fourth port acts; The fifth land is disposed apart from the four lands by a predetermined distance and has a smaller cross-sectional area in which hydraulic pressure acts compared to the fourth land, and the fifth land in which the pressure of the fifth port introduced hydraulic pressure acts, and the predetermined distance from the fifth land. Is spaced apart from the fifth Compared to the land, the cross-sectional area where the hydraulic pressure acts is made smaller, and the sixth land in which the pressure of the sixth port introduced hydraulic pressure acts, and the sixth land are disposed apart from the sixth land by a predetermined distance, and the hydraulic pressure acts on the sixth land. A valve spool made of a seventh land having a small cross-sectional area and acting on a pressure of the seventh port drawn-in hydraulic pressure; An elastic member disposed inside the valve body to support the valve spool but disposed on one side of the first land so as to face pressure acting on the third, fourth, fifth, sixth, and seventh lands to support the valve spool; Hydraulic control system for an automatic transmission comprising an elastic member elastic force adjustment unit fixed to one end of the elastic member in order to adjust the elastic force of the elastic member to the appropriate strength. The hydraulic control system for an automatic transmission according to claim 2, wherein the elastic member comprises a compression coil spring. The regulator of claim 1, wherein the shift control valve includes a first port through which a line pressure is drawn through the manual valve, and a line of the regulator valve to maintain a constant pressure in the traveling range 2 at the line pressure drawn into the first port. A second port connected to a five port, a third port connected to a sixth port of a regulator valve to maintain a constant pressure in the driving range 3 at the line pressure drawn into the first port, and the first port A fourth port connected to a seventh port of the regulator valve to maintain a constant pressure in the driving range 4, and the hydraulic pressure introduced into the second, third and fourth ports described above, and A discharge port for selectively discharging the four-speed line pressure, a first port, and a fifth port in which the drawn line pressure is selectively controlled by the shift control solenoid valve to control the angular shift of the traveling range, and the first port. The sixth port for controlling the drawn line pressure to drive the driving range 4 speed, the seventh port for controlling the driving range 3 speed to the line pressure introduced to the first port, and the line pressure introduced to the first port The eighth port for controlling the range second speed, the ninth port for being controlled by the line pressure shift control solenoid valve introduced into the first port, and the hydraulic pressure introduced into the ninth port are supplied to the shift control solenoid valve. A valve body comprising a tenth port to be selectively inputted by the eleventh port and an eleventh port to be selectively inputted to the ninth port by the shift control solenoid valve; The valve body is arranged to be slidably movable, and selectively connects the second, eighth ports, the second, eighth, threeth, seventh ports, and the second, eighth, threeth, seventh, fourth, sixth ports to the respective driving ranges. A valve spool comprising a land for controlling the shift stage; A first plug slidably disposed at one end of the valve body and controlled by a shift control solenoid valve; A second plug installed at the other end of the valve body in which the first plug is installed and controlled by a shift control solenoid valve; A first stopper provided on the tenth port side of the valve body to limit the movement of the first plug; A hydraulic control system for an automatic transmission provided on the discharge valve side of the valve body and including a second stopper for limiting the movement of the second plug.