KR100401601B1 - Hydraulic control system for automatic transmission - Google Patents

Abstract

PURPOSE: A hydraulic control system for an automatic transmission is provided to prevent the abnormal hydraulic pressure caused by the leakage of hydraulic pressure generated at a third shift control solenoid valve from being supplied to an end clutch by supplying hydraulic pressure supplied to a low-reverse brake in shifting to an R range to a control switch valve and controlling the control switch valve, to prevent the breakdown of the transmission caused by abnormal shock and to improve shift quality by smoothly discharging the hydraulic pressure of the end clutch. CONSTITUTION: A hydraulic control system for an automatic transmission is composed of a line pressure control device for regulating hydraulic pressure supplied from a hydraulic pressure generating device into line pressure; a damper clutch control device for supplying or discharging the hydraulic pressure supplied from the line pressure control device to each lubricating part and a torque converter(4); a reducing pressure control device for decompressing the hydraulic pressure supplied from the line pressure control device; a range control device for interlocking with operations of a shift lever and supplying the hydraulic pressure supplied to the line pressure control device to passages corresponding to each range selection; a hydraulic control device for controlling the hydraulic pressure supplied from the range control device into friction element actuating pressure to a signal of a TCU(Transmission Control Unit); and a hydraulic pressure distributing device for forming the passage by the hydraulic pressure supplied from the hydraulic control device and distributing the hydraulic pressure to the selected friction element. The hydraulic pressure distributing device comprises a 1-2 shift valve(68) operated by the line pressure controlled by the shift control device to control the flow of line pressure in shifting 1 to 2 speed in a D range and a pipe connected with a low-reverse brake(81) in moving reverse; a 2-4/4-3 shift valve(70) operated by the pressure of 3 or 4 speed from the shift control device to control the hydraulic pressure acting on the releasing side of a front clutch(100), a rear clutch(106), and a kick down servo brake(96); an N-R control valve(50) for preventing shock in shifting from N to R range of the shift lever and controlling the hydraulic pressure supplied to the low-reverse brake; and a control switch valve(72) for controlling the hydraulic pressure supplied and discharged to the end clutch by on/off operations of a third shift control solenoid valve(118) by receiving the line pressure controlled by the line pressure control device and preventing the abnormal operation of the end clutch(75) by receiving the hydraulic pressure supplied from the N-R control valve to the low-reverse brake in shifting to the R range.

Description

Hydraulic Control System for Automatic Transmission

The present invention relates to a hydraulic control system for an automatic transmission, and more particularly, for an automatic transmission that prevents abnormal hydraulic pressure from being supplied to an end clutch when shifting to an R range, thereby preventing damage to the automatic transmission and improving a feeling of shifting. A hydraulic control system.

In general, an automatic transmission for a vehicle has a torque converter and a multistage gear 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 operating state of the vehicle. It includes.

The hydraulic control system for controlling the operation of the hydraulically actuated friction element is to operate the selected friction element through the control valve for the hydraulic pressure generated from the oil pump.

The hydraulic control system includes a pressure regulating means for adjusting the oil pressure generated from the oil pump, a shift control means for forming a shift mode, and a hydraulic control means for adjusting shifting feeling and responsiveness to form a smooth shift mode in shifting. And damper clutch control means for damper clutch operation of the torque converter, and hydraulic distribution means for distributing a proper hydraulic supply to each friction element.

However, in the hydraulic control system as described above, the abnormal hydraulic pressure is supplied to the end clutch through the control switch valve due to leakage of hydraulic oil generated from the shift control solenoid valve when shifting to the R range.

As a result, the end clutch is operated during the R range, thereby causing abnormal shock and deteriorating a feeling of shifting.

Therefore, the present invention has been made to solve the above problems, an object of the present invention is to prevent the abnormal operation of the end clutch by blocking the supply pressure of the third shift control solenoid valve supplied to the end clutch when shifting to the R range Therefore, to prevent damage to the automatic transmission due to abnormal shock, and to provide a hydraulic control system for an automatic transmission that can improve the transmission feeling.

The present invention to achieve the above object, the line pressure control means for adjusting the hydraulic pressure supplied from the hydraulic pressure generating means to the line pressure; Damper clutch control means for supplying or discharging the hydraulic pressure supplied from said line pressure control means to each lubrication part and a torque converter; Reducing pressure control means for reducing the hydraulic pressure supplied from said line pressure control means to a reducing pressure; Range control means for supplying the hydraulic pressure supplied to the line pressure control means in a flow path corresponding to each range selection in conjunction with the operation of the shift lever; Hydraulic control means for controlling the hydraulic pressure supplied from the range control means to the friction element operating pressure in accordance with a signal from a transmission control unit (TCU); In the hydraulic control system for an automatic transmission comprising a hydraulic distribution means for forming a flow path by the hydraulic pressure supplied from the hydraulic control means, and distributes the hydraulic pressure supplied from the hydraulic control means to the selected friction element through the formed flow path. ,

The hydraulic distribution means is operated by the line pressure controlled by the shift control means, and controls the flow of the line pressure when shifting from the 1st to the 2nd speed of the D range, and the reversely connected pipeline connected to the low-reverse brake. A 1-2 shift valve to control; A 2-4 / 4-3 shift valve which is operated by the third speed or the fourth speed from the shift control means and controls the hydraulic pressure acting on the release side of the front clutch, the rear clutch and the kickdown servo brake; An N-R control valve for preventing shock when shifting from the N range of the shift lever to the R range and controlling the oil pressure supplied to the low-reverse brake; A valve for controlling the hydraulic pressure supplied / discharged to the end clutch by the on / off action of the third shift control solenoid valve by receiving the controlled line pressure from the line pressure control means. -Provides hydraulic control system for automatic transmission including control switch valve to prevent abnormal operation of end clutch by receiving hydraulic pressure supplied to reverse brake.

The control switch valve may include: a first port connected to the third speed pressure pipe so as to receive the third speed pressure from the shift control means; A second port formed at an adjacent side of the first port and connected to receive hydraulic pressure through a pipeline connected to the 1-2 shift valve; A third port formed adjacent to the second port and connected by a conduit so as to receive a second speed pressure from the shift control means via a 1-2 shift valve; A fourth port formed adjacent to the third port and connected to receive an on / off control pressure of a third shift control solenoid valve; A fifth port connected to the conduit to supply a third speed pressure supplied to the first port to an end clutch and a fail safe valve; A sixth port formed at an adjacent side of the fifth port and connected to a pipe to supply hydraulic pressure supplied to the second port or the third port to the fail safe valve; It is formed at one end of the adjacent side of the first port, that is, opposite to the fourth port, and is connected to a pipe line communicating with a pipe for supplying hydraulic pressure from the 1-2 shift valve to the low-reverse brake. And a seventh port which moves the spool to communicate the fifth port and the third port.

1 is a hydraulic circuit diagram formed in the R range state of the hydraulic control system for an automatic transmission according to the present invention.

Figure 2 is an enlarged configuration diagram showing a control switch valve of the hydraulic control system for automatic transmission according to the present invention.

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

1 is a hydraulic circuit diagram formed in the R range of the hydraulic control system for an automatic transmission according to the present invention. The oil pump 2 pumps oil by the driving force of the engine, and transmits the engine power to the input shaft of the transmission. A torque converter 4, a damper clutch 6 installed in the torque converter for increasing power transmission efficiency, a damper clutch control valve 8 for controlling the automatic and release of the damper clutch 6, and the oil And a regulator valve 10 for adjusting the hydraulic pressure generated in the pump 2 to line pressure.

The oil pump 2 mounted on the pump drive hub of the torque converter 4 continuously generates hydraulic pressure at the same time as the engine is driven, and supplies the regulated pressure to the regulator valve 10 which is a line pressure control means. It is connected to the line pressure line 12 so that.

The regulator valve 10 of the damper clutch control means is installed to control the hydraulic pressure supplied to the line pressure line 12 to the lubrication portion of the transaxle and the damper clutch (6) built in the torque converter (4) It is configured to supply / discharge to the torque converter control valve 14, the damper clutch control valve 8 and the torque converter 4, and is connected to a plurality of conduits 16, 18, 20, 22, and 24.

On the other hand, the reducing valve 26 of the reducing pressure control means connected to the line pressure line 12 and supplied with the line pressure regulated by the regulator valve 10 controls the damper clutch control valve 8 to the transmission control unit (TCU). Damper clutch control solenoid valve 15 to control in accordance with the signal of the hydraulic control means and configured to supply the reducing pressure is connected to the pipelines (30, 32), respectively.

And the line pressure line 12 is configured to form a flow path corresponding to each range in conjunction with the operation of the shift lever is connected to the manual valve 34 of the range control means, the manual valve 34 is parking (P), reverse (R), neutral (N), and travel (D, 2, L) range is selectable.

Therefore, the manual valve 34 is connected to each of the conduits 36 and 38 so as to supply hydraulic pressure to the regulator valve 10 at the time of selecting the forward and the reverse, and to adjust the line pressure appropriate to each range.

The manual valve 34 is configured to supply / discharge hydraulic pressure to the shift control means and the hydraulic control means, is connected to the shift control valve 40 of the shift control means and the conduit 42, and the The first and second hydraulic control valves 44 and 46 are connected to the conduit 48, and the NR control valve 50 and the conduit 52 are respectively connected.

The shift control valve 40 is a 2, 3, 4 speed by 2, 3, 4 speed by the first and second shift control solenoid valve (54, 56) on / off operation in accordance with the signal of the transmission control unit (TCU) It is configured to supply or discharge the angular velocity pressure supplied to the 3,4 velocity pipeline (58, 60, 62).

The first and second hydraulic control valves 44 and 46 of the hydraulic control means may be operated by the first and second hydraulic control solenoid valves 64 and 66 which are duty controlled according to the signal of the transmission control unit. It is made up of connected parts.

Meanwhile, the first and second hydraulic control valves 44 and 46 and the NR control valve 50 are supplied with the reducing pressure reduced by the reducing valve 26 by the first and second hydraulic control solenoid valves 64 and 66. Each is connected to a conduit 32 so that it can be controlled.

The hydraulic pressure controlled by the first and second hydraulic control valves 44 and 46 and the NR control valve 50 as described above supplies the hydraulic pressure to the selected friction element, and the shift control valve 40 can discharge the supplied hydraulic pressure. Hydraulic distribution means, which are actuated by the hydraulic control means, are provided between the hydraulic control means wave friction elements.

Therefore, the hydraulic distribution means is configured to include a plurality of spool valve that can change the flow path.

Among them, the 1-2 shift valve 68 is connected to the second speed pipeline 58 and controlled by the second speed pressure to supply the hydraulic pressure supplied from the first hydraulic control valve 44 to the 2-3 / 4-3 shift valve ( 70) and the control switch valve 72 to the fail-safe valve 74 and the end clutch 75, or connected to the conduits (76, 78) to discharge the hydraulic pressure from them, NR control valve The valve spool 84 connected to the pipeline 82 so as to supply the hydraulic pressure supplied to the pipeline 80 from the 50 to the low-reverse brake 81 or to discharge the hydraulic pressure therefrom, can be controlled as described above. ) Structure.

In addition, the two-speed pipeline 58 is extended to the pipeline 86 via the 1-2 shift valve 68, the pipeline 86 is to supply a two-speed pressure to the fail-safe valve 74 to control it Connected and supplied to the control switch valve 72 to supply and discharge hydraulic pressure to the subapplied 85 of the kickdown band brake 96 through the control switch valve 72 and the fail-safe valve 74. Are connected by pipelines 88 and 90.

And the 2-3 / 4-3 shift valve 70 is connected to the three-speed pressure line 62 and controlled by three-speed pressure, is connected to the rear clutch discharge valve 92 and the conduit 94, this conduit 94 The hydraulic pressure supplied to the conduit 94 is controlled by the four-speed pressure supplied to) and supplied to the servo release 98 of the kick-down band brake 96 and one side of the front clutch 100 and the fail-safe valve 74. Or, it is connected to the conduit 102 so as to discharge the hydraulic pressure therefrom, and consists of a structure including a valve spool 104 that can be controlled as described above.

In addition, the rear clutch discharge valve 92 controlled by the hydraulic pressure supplied to the four-speed pressure line 62 receives the hydraulic pressure supplied from the second hydraulic control valve 46 of the rear clutch 106 and the fail safe valve 74. It is connected to the pipe (108, 110) to supply or discharge the hydraulic pressure supplied to one side, and consists of a structure including the first, second valve spools (112, 114) that can be controlled as described above.

In addition, the rear clutch discharge valve 92 is connected to the 2-3 / 4-3 shift valve 70 by a conduit 94 to supply hydraulic pressure to a conduit 38 connected to a manual valve. And the hydraulic pressure of the front clutch 100 and the servo release 98 via the 2-3 / 4-3 shift valve 70.

On the other hand, the fail-safe valve 74 is a hydraulic pressure supplied to the conduits (78, 86, 102, 110) for supplying and discharging the hydraulic pressure supplied from the control switch valve 72 to the servo supply 98 of the kick-down band brake 96 It is controlled by the conduit (88, 90) is controlled to communicate with each other and has a valve spool 120 to enable such control.

The control pressure of the third shift control solenoid valve 118 controlling the control switch valve 72 simultaneously acts on the high-low pressure valve 122, and for this purpose, the high-low pressure valve 122 is a three-speed pressure pipe. It is installed on the conduit connecting between the 60 and the regulator valve 10.

The high-low pressure valve 122 supplies the three-speed pressure supplied to the three-speed pipeline 60 connected to the shift control valve 40 to the regulator valve 10 as the pipeline 124 to supply the line pressure to the high and low states. It is configured to control.

The control switch valve 72 is the on / off of the third shift control solenoid valve 118 to control the hydraulic pressure supplied to the pipeline 116 connected to the manual valve 34 in accordance with the signal of the transmission control unit (TCU). The hydraulically operated by the off control pressure and controlled by the second speed pressure to supply the hydraulic pressure supplied from the first hydraulic control valve 44 via the 1-2 shift valve 68 to the fail safe valve 74 and the end clutch 75. Conduits 76,86 to communicate with conduits 78,88, or conduits 62,76 to conduits 78,88 so that they can be fed or discharged to It is connected and connected by the pipeline 82 and the pipeline 126 which connect the 2 shift valve 68 and the low-reverse valve 81, and the valve spool 128 is provided so that it may control as mentioned above. .

The control switch valve 72 is a control switch in the end clutch 75 to prevent the end clutch 75 from being operated by abnormal hydraulic pressure generated in the third shift control solenoid valve 118 when shifting to the R range. The valve 72 is configured to smoothly discharge hydraulic pressure.

That is, as shown in FIG. 2, the control switch valve 72 includes a first port 130 connected to the three speed pressure line 60 to receive a three speed pressure from the shift control valve 40, and the first port 130. A second port 132 formed at an adjacent side of the 130 and connected to receive a hydraulic pressure to a conduit 76 connected to the 1-2 shift valve 68, and formed at an adjacent side of the second port 132; Adjacent to the third port 134 and the third port 134 connected by a conduit 86 so as to receive a second speed pressure from the shift control valve 40 via the 1-2 shift valve 68. End clutch 75 formed at the side and connected to receive the on / off control pressure with the third shift control solenoid valve 118 and the third speed pressure supplied to the first port 130. And a fifth port 138 connected to the conduit 78 to supply to the fail-safe valve 74, and a second port 132 or a third formed adjacent to the fifth port 138. A sixth port 140 connected to the conduit 90 to supply hydraulic pressure supplied to the port 134 to the fail-safe valve 74, and an adjacent side of the first port 130, that is, the fourth port 136. R control at the time of R range connected to the conduit 126 which is formed at one end of R side and is connected to the conduit 86 which supplies hydraulic pressure from the 1-2 shift valve 68 to the low-reverse brake 81 at the time of R range. And a seventh port 142 that receives pressure.

In addition, the control switch valve 74 is controlled by the control pressure supplied to the fourth port 136 as described above, and supplies the third speed pressure supplied to the second port 132 to the fifth port 150 or the second pressure. An elastic member may be selectively supplied to the fifth and sixth ports 138 and 140 or the hydraulic pressure supplied through the fifth port 138 may be discharged to the third port 134. One side is elastically supported by 144, and comprises a valve spool 128 composed of a plurality of lands.

The valve spool 128 has a first land 146 having a hydraulically acting surface on which the hydraulic pressure supplied to the fourth port 136 acts, and a hydraulically acting surface having the same size on an adjacent side of the first land 146. And a second land 148 for selectively controlling communication between the second port 130 and the third port 134 to the fifth and sixth ports 138 and 140 together with the first land 146. It has a hydraulic action surface of the same size on the adjacent side of the second land 148, and selectively controls the communication between the first and second ports 130, 132 and the fifth port 138, and the elastic member 144 It includes a third land 150 that is supported on one side to supply the third speed pressure supplied to the first port 130 to the fifth port 138, or to supply the hydraulic pressure supplied to the second port 132 to the fifth port. 138 and the sixth port 140 to be selectively supplied or discharged, or is configured to be able to supply the hydraulic pressure supplied to the third port 134 to the sixth port 140.

The hydraulic control system for an automatic transmission configured as described above automatically shifts the transmission as the transmission control unit controls each solenoid valve on / off and duty according to the operation of the manual valve 40 and the vehicle speed and the throttle valve opening degree. Will be realized.

The oil pressure generated from the oil pump 2 during the R range shift of the hydraulic control system is regulated to a constant line pressure in the regulator valve 10 and supplied to the line pressure line 12, and simultaneously to the torque converter control valve 14. do.

As the transmission control unit (TCU) controls the damper clutch control solenoid valve 15, the reducing pressure supplied from the reducing valve 26 to the pipeline 30 acts on the damper clutch control valve 8. Supply / discharge to (20, 22) to release the damper clutch.

At this time, the manual valve 34 communicates the line pressure line 12 with the pipe lines 38 and 152 by shifting the R range of the shift lever.

The hydraulic pressure supplied to the conduit 38 is supplied to the third port 154 of the regulator valve 10 to control the regulator valve 10, and also the conduit 156 and 2 through the rear clutch discharge valve 92. It is supplied to the -3 / 4-3 shift valve to communicate the conduit 94 and the conduit 102 while moving its valve spool 104 to the left in the figure.

Therefore, the hydraulic pressure supplied to the conduit 38 is supplied to the front clutch 100 through the conduits 94 and 102 to operate it. And it is supplied to the servo release 98 of the kick-down band brake 75 to release it.

In addition, as the transmission control unit (TCU) controls the first and second pressure control solenoid valves 64 and 66 off, the reducing pressure supplied through the conduit 32 from the reducing valve 26 is the first and second pressure. It acts on the control valves 44 and 46 and the NR control valve 50 to duty-control these valves.

The reducing pressure acting on the N-R control valve causes the valve spool 154 to communicate with the conduit 152 and the conduit 52 while moving to the left as shown in the drawing.

Accordingly, the hydraulic pressure supplied to the conduit 152 is supplied to the conduit 52 through the 1-2 shift valve 68 connected to the conduit 52 and the low-reverse brake 81 through the conduit 82. ) To activate it.

The hydraulic pressure is supplied to the seventh port 142 of the control switch valve 72 through the conduit 126 connected to the conduit 82 to move the valve spool 128 to the right as shown in the drawing. The second channel 132 communicates with the conduit 78 connected to the port 138 to discharge the hydraulic pressure discharged from the end clutch 75 through the conduit 78 to the second port 132, and the third shift control. The abnormal hydraulic pressure due to the leakage pressure of the solenoid valve 118 is prevented from being supplied to the end clutch 75.

The hydraulic control system for an automatic transmission according to the present invention is configured to supply a hydraulic pressure supplied to a low-reverse brake to a control switch valve when shifting to an R range to control a control switch valve, thereby generating a third shift control solenoid valve. The abnormal hydraulic pressure caused by the leakage oil is prevented from being supplied to the end clutch, and the hydraulic pressure is smoothly discharged from the end clutch, thereby preventing damage to the automatic transmission due to the abnormal shock and improving the feeling of shifting.

Claims (2)

Line pressure control means for adjusting the oil pressure supplied from the oil pressure generating means to line pressure; A damper clutch control means for supplying or discharging the hydraulic pressure supplied from said line pressure control means to each lubrication part and a torque converter, a reducing pressure control means for reducing the hydraulic pressure supplied from said line pressure control means to a reducing pressure, and a shift lever. Range control means for supplying the hydraulic pressure supplied to the line pressure control means in the flow path corresponding to each range selection in conjunction with the operation of the operation, and the hydraulic pressure supplied from the range control means in accordance with the signal of the transmission control unit (TCU) A hydraulic control means for controlling the friction element operating pressure, and a hydraulic distribution means for forming a flow path by the hydraulic pressure supplied from the hydraulic control means, and for distributing the hydraulic pressure supplied from the hydraulic control means to the selected friction element through the flow path thus formed. For automatic transmission In the pressure control system, The hydraulic distribution means is operated by the line pressure controlled by the shift control means, and controls the flow of the line pressure when shifting from the 1st to the 2nd speed of the D range, and at the reverse the low-reverse brake 81 1-2 shift valve 68 for controlling the connected pipeline; 2-4 / 4 which is operated by the third speed or the fourth speed from the shift control means and controls the hydraulic pressure acting on the release side of the front clutch 100, the rear clutch 106 and the kickdown servo brake 96; -3 shift valve 70; An N-R control valve 50 which prevents an impact when shifting from the N range of the shift lever to the R range and controls the oil pressure supplied to the low-reverse brake 81; A valve for controlling hydraulic pressure supplied / discharged to the end clutch 75 by on / off action of the third shift control solenoid valve 118 by receiving the line pressure controlled by the line pressure control means. Control valve (Hydraulic control system for an automatic transmission comprising a control switch valve 72 to prevent abnormal operation of the end clutch 75 by receiving the hydraulic pressure supplied from the low-reverse brake 81 from five persons. The control switch valve (72) of claim 1, further comprising: a first port (130) connected to the three-speed pressure pipe (60) to receive three-speed pressure from the shift control means; A second port 132 formed at an adjacent side of the first port 130 and connected to receive hydraulic pressure through a conduit 76 connected to the 1-2 shift valve; A third port 134 formed on an adjacent side of the second port 132 and connected by a conduit to receive a second speed pressure from the shift control means via the 1-2 shift valve 68; A fourth port 136 formed at an adjacent side of the third port 134 and connected to receive an on / off control pressure of the third shift control solenoid valve 118; A fifth port 138 connected to the conduit 78 to supply the third speed pressure supplied to the first port 130 to the end clutch 75 and the fail safe valve 74; A sixth port formed at an adjacent side of the fifth port 138 and connected to the pipeline 90 to supply hydraulic pressure supplied to the second port 132 or the third port 134 to the fail safe valve 74; Port 140; It is formed at one end adjacent to the first port 130, that is, opposite to the fourth port 136, and communicates with a conduit 86 that supplies hydraulic pressure from the 1-2 shift valve 68 to the low-reverse brake 81. Automatic transmission including a seventh port 142 connected to the pipe 126 is connected to the fifth port 138 and the third port 134 by moving the valve spool to receive the hydraulic pressure when the R range shift Hydraulic control system.

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