KR100216466B1 - Hydraulic control device and its method - Google Patents

Abstract

In order to prevent the pressure release delay of the rear clutch released during the 3-4 shift and to prevent the pressure drop of the end clutch which continues to operate during the 4-3 shift, A line pressure control means for controlling the hydraulic pressure supplied from the hydraulic pressure generating means to a line pressure, a damper clutch for driving / releasing the damper clutch by supplying / discharging the hydraulic pressure supplied from the line pressure control means to the lubricating portion and the torque converter of the power train, Pressure control means for reducing the hydraulic pressure supplied from the line pressure control means and supplying the pressure to the solenoid valve control pressure, hydraulic pressure control means for controlling the hydraulic pressure supplied from the line pressure control means to the line pressure control means in accordance with the selected range in conjunction with the operation of the shift lever A range control means for performing port conversion so as to supply the lane The hydraulic pressure supplied from the control means is supplied at the respective second, third and fourth pressure corresponding to the respective speed change stages in accordance with the control signal of the transmission control unit (TCU), and the third pressure is selectively supplied to the friction element A hydraulic control means for controlling the hydraulic pressure supplied from the range control means to the respective friction element operating pressures under the control of the transmission control unit (TCU), a hydraulic control means provided between the hydraulic control means and the friction element, The hydraulic pressure supplied from the control means and the hydraulic pressure selectively supplied / discharged from the hydraulic control means to distribute the hydraulic pressure selectively supplied / discharged from the hydraulic control means and the shift control means to supply / discharge the selected hydraulic pressure to / from the selected friction element And a hydraulic pressure control system for an automatic transmission including a distributing means.

Description

Hydraulic control system for automatic transmission and control method thereof

The present invention relates to a hydraulic control system for a 4-speed automatic transmission, and more particularly, to a hydraulic control system for a 4-speed automatic transmission that prevents a pressure release delay of a friction element released in 3-4 shifts, To increase the responsiveness of the transmission and the transmission feeling.

BACKGROUND ART [0002] In general, a vehicular automatic transmission is configured such that a rotational power of an engine is torque-converted by a torque converter, and the converted rotational power is converted in a multi-speed transmission mechanism composed of a planetary gear unit according to the engine speed, .

In order to convert the rotational power in the planetary gear unit, the automatic transmission is variably fixed to the transmission housing so as to be able to operate as a reaction force element via brake means which is a friction element to a specific element of the planetary gear unit, And a hydraulic control system for variably connecting the input shaft to the input shaft so as to be able to operate as an input element through a clutch means which is another friction element, and to operate and release the friction elements.

The hydraulic control system for an automatic transmission includes a drive gear mounted on an oil pump drive hub driven together with a pump impeller of a torque converter, and a drive gear meshed with the driven gear, To the respective friction elements for controlling the lubricating portion of the planetary gear set, the damper clutch mounted on the torque converter, and the respective elements of the planetary gear set.

In the hydraulic control system for an automatic transmission as described above, a rabine-type compound planetary gear device and a power train that controls the front elements, the rear clutch, the clutch, the kick-down band brake, and the low reverse brake, The release pressure of the rear clutch released in the 3-4 shift is released to the orifice so that the release of the rear clutch pressure is delayed and the operating pressure of the end clutch continuously operating in the 4-3 shift is transmitted to the front The operating pressure of the clutch lowers the operating pressure of the end clutch, which causes a disadvantage that the shift responsiveness and the shift feeling are lowered in 3-4 and 4-3 shifts.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a rear clutch that releases a pressure release delay of a rear clutch released during a 3-4 shift, And to provide a hydraulic control system for an automatic transmission that increases the speed responsiveness and transmission feeling by preventing the hydraulic pressure control system from deteriorating.

In order to achieve this, the hydraulic control system for an automatic transmission according to the present invention comprises line pressure control means for controlling the hydraulic pressure supplied from the hydraulic pressure generating means to line pressure, hydraulic pressure supplied from the line pressure control means to the lubricating portion of the power train, A damper clutch control means for supplying / discharging to / from the converter to operate / disengage the damper clutch; a rupture pressure control means for reducing the hydraulic pressure supplied from the line pressure control means to supply the hydraulic pressure to the solenoid valve control pressure; A range control means for performing port conversions so as to supply hydraulic pressure supplied from the line pressure control means at a flow path corresponding to each range, a control means for controlling the oil pressure supplied from the range control means, Corresponding to each of 2, 3, 4 speed presses And a third control means for controlling the second-speed pressure to selectively supply the third-speed pressure to the friction element, a shift control means for controlling the hydraulic pressure supplied from the range control means to the respective friction element operating pressures under the control of the transmission control unit The hydraulic control means being provided between the hydraulic control means and the friction element and controlled by the hydraulic pressure supplied from the shift control means and the hydraulic pressure selectively supplied from the hydraulic control means and selectively supplied from the hydraulic control means and the shift control means, And a hydraulic pressure distributing means for distributing the supplied / discharged hydraulic pressure to supply / discharge the selected friction element.

The control method of the hydraulic control system for an automatic transmission according to the present invention controls the shift control means according to the control signal of the transmission control unit (TCU) to form a hydraulic passage in the hydraulic pressure distributing means and supply hydraulic pressure to the hydraulic pressure distributing means And controls the hydraulic control means to control the hydraulic pressure supplied from the range control means to supply the hydraulic pressure to the hydraulic pressure distributing means. The hydraulic pressure supplied from the shift control means and the hydraulic control means is transmitted through a hydraulic passage formed by the hydraulic pressure distributing means, And the friction elements are operated / released to realize the respective gear positions.

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

FIG. 1 is a hydraulic circuit diagram formed in the 3-4 shift process of the hydraulic control system for an automatic transmission according to the present invention. FIG.

FIG. 2 is a hydraulic circuit diagram formed in the 4-3 shifting process of the hydraulic control system for an automatic transmission according to the present invention. FIG.

FIG. 1 is a hydraulic circuit diagram formed in the 3-4 shift process of the hydraulic control system for an automatic transmission according to the present invention, in which the hydraulic pressure generated and supplied from the hydraulic pressure generating means is supplied / discharged to each friction element corresponding to each speed change stage So that the automatic transmission can be realized by independently operating / releasing the selected friction element.

That is, the oil pump 3 mounted on the pump dry hub of the torque converter 1 generates hydraulic pressure continuously with the drive of the engine and supplies it to the regulator valve 5, which is the line pressure control means, And is connected to the line pressure pipeline (7).

The regulator valve 5 controls the hydraulic pressure supplied to the line pressure line 7 to the torque converter control valve of the damper clutch control means provided to control the lubricating portion of the transaxle and the damper clutch built in the torque converter 1, 15, 17, 19, and 21 so as to be supplied / discharged to / from the damper clutch control valve 11 and the torque converter 1, respectively.

On the other hand, the reducing valve 23 of the rupture pressure control means connected to the line pressure line 7 and supplied with the regulated line pressure from the regulator valve 5 controls the damper clutch control valve 11 to the transmission control unit TCU A damper clutch control solenoid valve 25 which is controlled in accordance with a control signal of the hydraulic control means, and pipelines 27 and 29 so as to supply a rheostat pressure to the hydraulic control means.

The line 29 is connected to the hydraulic regulator valve 5 so as to supply the hydraulic pressure to the high-low pressure valve 31 which controls the line pressure to a high-low state in accordance with the speed change stage. The high / low valve 31 Is connected to the pipeline 33 so that the damper clutch control solenoid valve 25 is activated or deactivated according to the on / off operation of the damper clutch control solenoid valve 25 and is operated by the control pressure of the solenoid valve 25, So that a part of the hydraulic pressure supplied to the friction element can act on / off the regulator valve (5).

The line pressure line 7 is connected to a manual valve 37 of a range control means for establishing a flow path corresponding to each range in conjunction with the operation of the shift lever. (R), neutral (N), and running (D, 2, L) ranges.

The manual valve 37 is connected to the regulator valve 5 through the conduits 39 and 41 so as to adjust the line pressure to each range by supplying the hydraulic pressure to the regulator valve 5 when the forward valve and the reverse valve are selected.

The manual valve 37 is connected to the shift control valve 43 of the shift control means through a channel 45 so as to supply / discharge the hydraulic pressure to / from the shift control means and the hydraulic control means, And is connected to the hydraulic control valves 47 and 49 by the piping 51 and is connected to the NR control valve 53 and the piping 55.

The shift control valve 43 is controlled by the first and second shift control solenoid valves 57 and 59 that are turned on and off in accordance with the control signal of the transmission control unit TCU to the second, 61, 63, and 65, respectively.

The first and second hydraulic control valves 47 and 49 of the hydraulic control means are operated by first and second hydraulic control solenoid valves 67 and 69 which are duty-controlled in accordance with the control signal of the transmission control unit TCU Which are connected to each other.

The third shift control solenoid valve 73 of the shift gun trolley unit is provided in the channel 71 extending to the second-speed pressure line 61 for supplying second-speed pressure from the shift control valve 43.

On the other hand, the first and second hydraulic control valves 47 and 49 and the NR control valve 53 are supplied with the reduced rupture pressure from the reducing valve 23 and are supplied with the first and second hydraulic control solenoid valves 67 and 69 And is connected to the pipe 29 so as to be controlled.

The oil pressure controlled by the first and second hydraulic control valves 47 and 49 and the NR control valve 53 is operated by the shift control valve 43 so as to supply / Is provided between the hydraulic control means and the friction element.

Therefore, the above-mentioned oil pressure distributing means comprises a plurality of spool valves which can change the oil passage.

The 1-2 shift valve 75 is connected to the second-speed pressure line 61 and is controlled by the second-speed pressure so that the hydraulic pressure supplied from the first hydraulic control valve 47 is supplied to the 2-3 / 4-3 shift valve The oil pressure supplied from the NR control valve 53 is supplied to the servo apply plate 81 of the kick down band brake 77 and the kick down band brake 79 via the conduits 83 and 85 so as to discharge the hydraulic pressure therefrom, And a valve spool 93 connected to the valves 89 and 91 so as to be supplied to the reverse brake 87 or to discharge hydraulic pressure therefrom and to be controlled as described above.

The 2-3 / 4-3 shift valve 77 is connected to the third-speed pressure line 63 and connected to the third-speed pressure line and the fourth-speed pressure line 65 to control the oil pressure supplied to the line 85, And is connected to the pipelines 99 and 101 so as to be supplied to the servo release 95 and the end clutch valve 97 of the kick down band brake 79 or to discharge the hydraulic pressure therefrom. (103).

The rear clutch discharge valve 105, which is controlled by the hydraulic pressure supplied to the 4th-speed pressure line 65, supplies the hydraulic pressure supplied from the second hydraulic pressure control valve 49 to the rear clutch 107 or discharges the supplied hydraulic pressure And a valve spool 113 connected to the conduits 99 and 101 so as to be controlled as described above. The rear clutch discharge valve 105 constitutes a bypass conduit 115 so that the hydraulic pressure supplied to the rear clutch 107 through the conduit 101 can control the valve spool 113. [

On the other hand, the end clutch valve 97 is controlled by the control pressure of the third shift control valve 73 for controlling the hydraulic pressure supplied to the pipeline 71 branched from the second-speed pressure line 61, The valve spool 125 is connected to the conduits 121 and 123 so as to supply the hydraulic pressure supplied to the branch conduit 117 to the end clutch 119 and the high-low valve 31, As shown in FIG.

The front clutch 127 is connected to a branch line 129 branched from the line 41 so that the front clutch 127 can be operated directly by the hydraulic pressure supplied from the manual valve 37 in the reverse direction.

The hydraulic control system for an automatic transmission structured as described above is configured such that the transmission control unit (TCU) turns on / off and duty-controls each solenoid valve according to the operation of the manual valve 37 and the opening of the vehicle speed and the throttle valve Thereby realizing a shift.

First, when the engine is started, the oil pressure generated in the oil pump 3 is regulated to a constant line pressure by the regulator valve 5 and supplied to the line pressure line 7 and simultaneously supplied to the torque converter control valve 9.

As the transmission control unit TCU controls the on / off control of the damper clutch control solenoid valve 25, the rupture pressure supplied from the reducing valve 23 to the turbo line 27 is transmitted to the damper clutch control valve 11 The hydraulic pressure is supplied / discharged or discharged / supplied to the pipelines 17 and 19 to release / operate the damper clutch.

(3-4 shifts)

When the vehicle speed and the throttle valve opening rate increase while the shift lever is selected as the running D range and the vehicle is running in the third speed state, as shown in FIG. 1, in the state in which the end clutch 119 is operated, TCU controls the first shift control solenoid valve 57 from off to on and controls the second shift control solenoid valve 59 to turn off the shift control valve 43 to the 2, , 63, 65).

The oil pressure supplied to the second and third oil pressure pipes 61 and 63 acts as in the third speed and the fourth speed pressure supplied to the fourth speed pressure path 65 is supplied to the rear clutch discharge valve 105, 111 are moved to the right as viewed in the figure, and the pipelines 109, 111 are communicated with each other.

At this time, the transmission control unit TCU controls the second hydraulic control solenoid valve 69 from OFF to ON so that the hydraulic pressure for operating the rear clutch 107 is transmitted through the pipeline 111 and the clutch release valve 105 And then discharged through the second hydraulic control valve 49 through the pipeline 109 to release the rear clutch 107 quickly.

The fourth-speed pressure is supplied to the 2-3 / 4-3 shift valve 77 so that the valve spool 103 is moved to the left as viewed in the figure to block the pipeline 99 from the pipeline 85, .

Therefore, the hydraulic pressure acting on the servo release 95 of the kickdown band brake 79 is discharged to the conduits 99, 101 communicated by the 2-3 / 4-3 shift valve 77.

The transmission control unit TCU performs duty control of the first hydraulic control solenoid valve 67 from off to on duty control to operate the first hydraulic control valve 47, The oil pressure is supplied to the servo-fly 81 of the kick-down band brake 79 to operate the kick-down band brake 79 to realize the fourth speed together with the already-operating end clutch 119.

On the other hand, before shifting to the fourth speed as described above, the transmission control unit TCU controls the third shift control solenoid valve 73 to be turned off to operate the end clutch valve 97 to open the communicated passages 117 and 121 And continues to supply the 2-speed pressure through.

(4-3 shift)

When the vehicle speed and the throttle valve opening rate decrease in the fourth speed state as described above, the transmission control unit TCU controls the first shift control solenoid valve < RTI ID = 0.0 > Off control of the second shift control solenoid valve 59 to shut off the hydraulic pressure supplied from the shift control valve 43 to the fourth-speed pressure line 65.

The hydraulic pressure supplied to the fourth speed pressure line 65 is discharged to the shift control valve 43 so that the valve spool 113 of the rear clutch discharge valve 105 moves to the left as viewed in FIG. 111 and the valve spool 103 of the 2-3 / 4-3 shift valve 77 is moved to the right as viewed in the drawing to cut off the conduits 99, 101, and the conduits 99, .

At this time, the transmission control unit TCU controls the second hydraulic control solenoid valve 69 from on to off to operate the second hydraulic control valve 49, And the hydraulic pressure is supplied to the clutch 107 to operate it.

Then, the transmission control unit (TCU) performs duty control of the first hydraulic control solenoid valve 67 from off to on, duty control to operate the first hydraulic control valve 47, And releases the kick-down band brake 79 by supplying oil pressure to the servo apply unit 81 and the servo release 95 via the oil line 99 and the oil line 99 so that the end clutch 119 and the rear clutch 107 ) To realize the third speed.

On the other hand, after shifting to the third speed as described above, the transmission control unit (TCU) controls the third shift control solenoid valve 73 to turn off, and operates the end clutch valve 97 to open the communicated passages 117 and 121 So that the end clutch 119 is continuously operated.

As described above, in the hydraulic control system for an automatic transmission according to the present invention, the release pressure of the rear clutch released in the 3-4 shift is controlled and released by the hydraulic control means, and the operating pressure Can be continuously controlled by the shift control means to increase the shift response and the shift feeling.

Claims (5)

A regulator valve 5 and a high-low valve 31 for regulating the hydraulic pressure supplied from the oil pump 3 to line pressure, a line pressure controlled by the regulator valve 5 to the lubricating unit and the torque converter 1 A damper clutch control valve 11 for controlling the damper clutch by supplying and discharging the damper clutch 11, a damper clutch control solenoid valve 25 for controlling the valve 11, a reduction valve 23 for reducing the line pressure, A manual valve 37 supplied with pressure and supplying / discharging hydraulic pressure to / from the front clutch 127 corresponding to each of the ranges, hydraulic pressure supplied from the manual valve 37 at 2, 3, The first and second shift control solenoid valves 57 and 59 for controlling the shift control valve 43 and the third shift control solenoid valve 57 to control and supply the third and fourth speed pressures to the fourth and fifth clutches, Supply / delivery to the end clutch 119 A third shift control solenoid valve 73 for causing the oil pressure supplied from the manual valve 37 to flow to the rear clutch 107, a low-reverse brake 87, an end clutch 119, a kick down band brake 79, The first and second hydraulic control valves 47 and 49 and the NR gun trolley valve 53 that regulate the supply of hydraulic oil to the servo boss 81 and the servo release 95 of the braking system First and second hydraulic control solenoid valves 67 and 69 for controlling the hydraulic pressure to control the valves 47 and 49 and the hydraulic control solenoid valves 47 and 49 for controlling the shift control valve 43 and the first and second hydraulic control valves 47 and 47, 49), and an oil pressure supplied / discharged from the NR control valve 53 to operate / release the friction elements by hydraulic pressure supplied / discharged from the valves 43, 47, 49, The shift valve 75, the 2-3 / 4-3 shift valve 77, the end clutch valve 97, and the rear clutch discharge valve 105, Hydraulic control system for an automatic transmission comprising. The shift control device according to claim 1, wherein the 1-2 shift valve (75) is configured to supply the oil pressure supplied from the NR control valve (53) to the low reverse brake (87) So that the hydraulic pressure supplied from the first hydraulic control valve 47 is supplied to the servo application 81 of the kick down band brake 79 and the 2-3 / 4-3 shift valve 77 And the 2-3 / 4-3 shift valve 77 is controlled by the third and fourth speed pressures supplied from the shift control valve 43, And a valve spool (103) connected to the servo clutch (95) of the kick down band brake (79) and the end clutch valve (97) 103 is controlled by the fourth-speed pressure of the shift control valve 43 And a valve spool 113 is connected to supply the hydraulic pressure supplied from the second hydraulic control valve 49 to the rear clutch 107. The end clutch valve 73 is connected to the shift control valve 43 The third shift control solenoid valve 73 is used to control the supplied second speed pressure to supply the third clutch pressure supplied from the shift control valve 43 to the end clutch 119 and the servo release 95, 125). ≪ / RTI > Control of the third shift control solenoid valve 73 for controlling the second, third and fourth speed pressures supplied from the shift control valve 43 controlled by the first and second shift control solenoid valves 57 and 59 and the second speed pressure The 2-3 shift valve 77, the end clutch valve 97 and the rear clutch discharge valve 105 are controlled so that the rear clutch 107, The oil supplied to the servo apply plate 81 and the servo release 95 of the low-reverse brake 87, the end clutch 119 and the kick-down band brake 79 is formed and the first and second hydraulic control solenoids Controls the first and second hydraulic control valves 47 and 49 and the NR control valve 53 controlled by the valves 67 and 69 to control the pressure of the hydraulic pressure supplied from the manual valve 37, The 1-2 shift valve 75, the 2-3 / 4-3 shift valve 77, the end clutch valve 97, and the rear clutch discharge valve 105 Selectively applied to the servo clutch 81 and the servo release 95 of the rear clutch 107, the low-reverse brake 87, the end clutch 119, the kick-down band brake 79, So as to realize each of the speed change stages. 4. The shift control apparatus according to claim 3, wherein, in 3-4 shifts, the first shift control solenoid valve (57) is controlled from off to on and the second shift control solenoid valve is controlled to be off Controls the second hydraulic control solenoid valve (69) from off to on to release the rear clutch (107), controls the duty ratio of the solenoid valve (67) The kick-down band brake 79 is actuated by operating the servo apply plate 81 while releasing the release 95 and realizing 4th speed. The third shift control solenoid valve 73, To the off-clutch (119), and continues to operate the hydraulic control system. 4. The shift control apparatus according to claim 3, wherein, during 4-3 shift, the first shift control solenoid valve (57) is controlled to be turned on and off and the second shift control solenoid valve (59) The duty control of the solenoid valve 67 from off to on and the duty control of the second hydraulic control solenoid valve 69 from on to off to operate the rear clutch 107, The third shift control solenoid valve 73 is turned off after completion of the third speed by disengaging the kick down band brake 79 by operating the servo control valve 81 and the servo release 95, And the hydraulic pressure is supplied to the end clutch (97), and the hydraulic pressure is continuously operated.