JP2017141927A - Hydraulic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a degree of freedom of the control of line pressure when controlling the line pressure on the basis of hydraulic pressure which is outputted from a plurality of electromagnetic control valves.SOLUTION: A hydraulic control device 2 has: a plurality of electromagnetic control valves 25 for outputting hydraulic pressure by receiving an input of line pressure; a shuttle valve 26 which is connected to a plurality of the electromagnetic control valves 25, and outputs maximum hydraulic pressure out of a plurality of pieces of the hydraulic pressure outputted from a plurality of the electromagnetic control valves 25; a low-pressure side control valve 28 for performing control so that the line pressure reaches added pressure which is obtained by adding prescribed surplus pressure to the hydraulic pressure outputted by the shuttle valve 26; and an electromagnetic selector valve 27 which switches a state that the line pressure should be controlled by the low-pressure side control valve 28 or not on the basis of an inputted control current.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hydraulic control device that controls hydraulic pressure for driving a mechanism unit or the like controlled by pressure.

  Conventionally, a method of controlling a mechanism unit using a plurality of solenoid valves is known. Patent Document 1 discloses a hydraulic control device that generates a line pressure for controlling a clutch based on a maximum hydraulic pressure among hydraulic pressures output from a plurality of solenoid valves.

JP 2013-194839 A

  In the conventional hydraulic control device, among the hydraulic pressures output from a plurality of solenoid valves, a regulator valve that generates the line pressure using the maximum hydraulic pressure, and the modulator pressure is generated based on the line pressure output from the regulator valve And a modulator valve is used. In the conventional configuration, since the pressure is limited by the modulator valve, a line pressure larger than the hydraulic pressure obtained based on the hydraulic pressure output from the plurality of solenoid valves cannot be output. Therefore, there is a problem that even if there is a case where it is desired to increase the response speed by increasing the flow rate of oil, the response cannot be increased by increasing the line pressure.

  Therefore, the present invention has been made in view of these points, and it is possible to improve the degree of freedom in controlling the line pressure when controlling the line pressure based on the hydraulic pressure output from a plurality of electromagnetic control valves. It is an object of the present invention to provide a hydraulic control device that can perform the above.

  In the first aspect of the present invention, a plurality of electromagnetic control valves that receive input of line pressure and output hydraulic pressure, and a plurality of electromagnetic control valves that are connected to the plurality of electromagnetic control valves and output from the plurality of electromagnetic control valves Among the hydraulic pressures, a shuttle valve that outputs the maximum hydraulic pressure, a control valve that controls the line pressure to be an added pressure obtained by adding a predetermined margin pressure to the hydraulic pressure output from the shuttle valve, and a control that is input There is provided a hydraulic control device comprising: an electromagnetic switching valve that switches whether the control valve controls the line pressure based on an electric current.

  For example, when the control current is larger than a predetermined threshold, the electromagnetic switching valve applies a control pressure equal to the line pressure to the control valve, and when the control current is equal to or less than the predetermined threshold, The control pressure is not applied to the control valve.

  The control valve discharges a part of oil on a hydraulic path connected to the electromagnetic control valve when the added pressure is equal to or lower than the control pressure, so that the line pressure becomes equal to the added pressure. You may control as follows.

  The plurality of electromagnetic control valves output hydraulic pressure to a plurality of mechanism means controlled by pressure, and the electromagnetic switching valve is based on a hydraulic pressure that needs to be applied to the plurality of mechanism means. The control valve may be switched to control the line pressure.

  According to the present invention, when the line pressure is controlled based on the hydraulic pressures output from the plurality of electromagnetic control valves, there is an effect that the degree of freedom in controlling the line pressure can be improved.

It is a figure which shows the one part schematic structure of the drive system of the vehicle which concerns on this embodiment. 2 is a diagram showing a configuration of a hydraulic control device 2.

  FIG. 1 is a diagram illustrating a schematic configuration of a part of a vehicle drive system according to the present embodiment. In the drive system shown in FIG. 1, the hydraulic control device 2 converts the output of the engine 1 into hydraulic pressure based on the control of the electronic control unit 5 (for example, ECU). The clutch 3 is operated by the hydraulic pressure output from the hydraulic control device 2 to operate the transmission 4. The hydraulic control device 2 changes the magnitude of the hydraulic pressure output to the clutch 3 based on the magnitude of the current input from the electronic control unit 5.

  FIG. 2 is a diagram illustrating a configuration of the hydraulic control device 2. FIG. 2 also shows the engine 1 and the clutch 3. The clutch 3 is a dual clutch having a clutch 31a and a clutch 31b.

  The hydraulic control device 2 includes an oil pump 21, an oil filter 22, an oil pan 23, a high pressure side control valve 24, electromagnetic control valves 25a and 25b, a shuttle valve 26, an electromagnetic switching valve 27, and a low pressure side control. And a valve 28.

  The oil pump 21 operates based on the output from the engine 1 and supplies hydraulic oil to the electromagnetic control valve 25 via the supply line a. In this specification, the hydraulic pressure of the supply line a is referred to as line pressure.

  The high-pressure side control valve 24 operates so that the line pressure is within the allowable maximum pressure Pmax. A line pressure is applied to the input port 241 of the high-pressure side control valve 24. Since the valve is closed while the line pressure applied to the input port 241 is equal to or less than the repulsive force of the spring 242, the high-pressure side control valve 24 does not affect the line pressure. Since the repulsive force of the spring 242 is set to a magnitude corresponding to the allowable maximum pressure Pmax, the high-pressure control valve 24 is configured so that the line pressure applied to the input port 241 is equal to or lower than the allowable maximum pressure Pmax. Does not affect line pressure.

  On the other hand, when the line pressure applied to the input port 241 becomes a pressure larger than the repulsive force of the spring 242, that is, a pressure larger than the allowable maximum pressure Pmax, the high pressure side control valve 24 opens the valve, Part of the hydraulic oil flowing through the supply line a is discharged to the oil pan 23. By doing so, the high-pressure side control valve 24 can maintain the line pressure below the allowable maximum pressure Pmax.

  The electromagnetic control valve 25a and the electromagnetic control valve 25b apply hydraulic pressure to the clutch 31a and the clutch 31b, respectively. The electromagnetic control valve 25a and the electromagnetic control valve 25b are linear solenoid valves that receive an input of line pressure and output a clutch control pressure corresponding to a current input by the control of the electronic control unit 5.

  The shuttle valve 26 outputs the larger clutch control pressure Pc of the clutch control pressure output from the electromagnetic control valve 25a and the clutch control pressure output from the electromagnetic control valve 25b to the low-pressure side control valve 28. To do. For example, when the clutch control pressure output from the electromagnetic control valve 25a is P1, the clutch control pressure output from the electromagnetic control valve 25b is P2, and P1> P2, the shuttle valve 26 sets P1 to the low-pressure side control valve 28. Apply to the first input port 281.

  The electromagnetic switching valve 27 has a current port 271 and an output port 272. A current is input to the current port 271 based on the control of the electronic control unit 5. The output port 272 is connected to the second input port 282 of the low-pressure side control valve 28 that controls the line pressure. The electromagnetic switching valve 27 changes the control pressure applied to the second input port 282 of the low-pressure side control valve 28 based on the magnitude of the current input to the current port 271 under the control of the electronic control unit 5. The operation mode of the low-pressure side control valve 28 is switched.

  The electromagnetic switching valve 27 opens the valve when a current of a predetermined magnitude or more is input to the current port 271, thereby applying a control pressure corresponding to the line pressure to the second input port 282 of the low-pressure side control valve 28. Apply. The electromagnetic switching valve 27 does not apply a control pressure to the second input port 282 by closing the valve when a current of a predetermined magnitude or larger is not input to the current port 271. The electromagnetic switching valve 27 switches whether or not to output the control pressure from the output port 272 under the control of the electronic control unit 5 based on the hydraulic pressure that needs to be applied to the plurality of clutches 3, for example.

  The low-pressure side control valve 28 has a first input port 281, a second input port 282, and a spring 283, and controls the line pressure. The first input port 281 is connected to the shuttle valve 26. The second input port 282 is connected to the output port 272 of the electromagnetic switching valve 27. The low-pressure side control valve 28 is input to the second input port 282 and a pressure obtained by adding the clutch control pressure Pc applied to the first input port 281 and the margin pressure Pm obtained by the repulsive force of the spring 283. The state of the built-in valve is adjusted according to the magnitude relationship with the pressure.

  The low pressure side control valve 28 is normally set to a first state in which a control pressure equal to the line pressure is applied to the second input port 282. In the first state, the low pressure side control valve 28 discharges a part of the hydraulic oil flowing through the supply line a to the oil pan 23 when the control pressure is larger than the addition pressure of the clutch control pressure Pc and the margin pressure Pm. Thus, the line pressure is adjusted to be equal to the addition pressure of the clutch control pressure Pc and the margin pressure Pm.

  On the other hand, when a predetermined current is not input to the current port 271 of the electromagnetic switching valve 27 under the control of the electronic control unit 5, no control pressure is applied to the second input port 282. The second state is closed. In this second state, the hydraulic control device 2 can increase the line pressure up to the allowable maximum pressure Pmax. By doing in this way, the electronic control part 5 can improve the responsiveness of the clutch 3 by controlling so that an electric current may not be sent through the electromagnetic switching valve 27, and raising a line pressure. Further, even when the clutch 3 needs to fill the piston chamber with oil, the electronic control unit 5 can supply the oil to the clutch 3 at a high speed by increasing the line pressure.

[Modification 1]
In the above description, the case where the hydraulic control device 2 applies pressure to the clutch 31a and the clutch 31b has been described, but the target to which the hydraulic control device 2 applies pressure is not limited to the clutch 31a and the clutch 31b. The hydraulic control device 2 applies pressure to any mechanism means that needs to control the pressure, such as when pressure is applied to the single clutch and the lockup clutch, or when pressure is applied to the gear shift unit and the clutch. May be applied.

[Modification 2]
In the above description, the case where the hydraulic control device 2 applies pressure to the clutch 31a and the clutch 31b has been described, but the number of objects to which the hydraulic control device 2 applies pressure may be three or more. In this case, the hydraulic control device 2 uses the plurality of shuttle valves 26 to apply the maximum pressure among the pressures for controlling the plurality of objects to the first input port 281.

[Effect of this embodiment]
The hydraulic control device 2 of the present embodiment is connected to a plurality of electromagnetic control valves 25 that receive an input of line pressure and outputs hydraulic pressure, and a plurality of electromagnetic control valves 25 that are connected to the plurality of electromagnetic control valves 25 and output from the plurality of electromagnetic control valves 25. A shuttle valve 26 that outputs the maximum hydraulic pressure, and a low-pressure side control valve 28 that controls the line pressure to be an added pressure obtained by adding a predetermined margin pressure to the hydraulic pressure output from the shuttle valve 26; And an electromagnetic switching valve 27 that switches whether the low-pressure side control valve 28 controls the line pressure based on the input control current.

  Since the hydraulic control device 2 has such a configuration, it is possible to switch whether or not the line pressure is set to a pressure controlled by the low-pressure control valve 28 by changing the current input to the electromagnetic switching valve 27. it can. Accordingly, the line pressure can be prevented from being controlled by the low-pressure side control valve 28, so that the line pressure can be increased as necessary to improve the responsiveness when the electromagnetic control valve 25 operates the mechanism means. It becomes possible.

  The electromagnetic switching valve 27 applies a control pressure equal to the line pressure to the low pressure side control valve 28 when the control current is larger than a predetermined threshold value, and when the control current is equal to or lower than the predetermined threshold value, No control pressure is applied to 28. Since the electromagnetic switching valve 27 is configured to switch the state by turning on / off the current in this way, the line pressure can be controlled to a desired pressure at a lower cost than the control using the linear solenoid valve. Is possible.

  When the added pressure is equal to or lower than the control pressure, the low pressure side control valve 28 discharges part of the oil on the hydraulic path connected to the electromagnetic control valve 25 so that the line pressure becomes equal to the added pressure. Control. By doing so, the low-pressure side control valve 28 can control the line pressure within a preset range.

  The plurality of electromagnetic control valves 25 output hydraulic pressure to the plurality of clutches 31, and the electromagnetic switching valve 27 is a low pressure side control valve based on the magnitude of hydraulic pressure that needs to be applied to the plurality of clutches 3. 28 switches whether to control the line pressure. By doing in this way, it becomes possible to control a line pressure according to the magnitude | size of the hydraulic pressure which needs to be applied to a control target object.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Engine 2 Hydraulic control apparatus 3 Clutch 4 Transmission 5 Electronic control part 21 Oil pump 22 Oil filter 23 Oil pan 24 High pressure side control valve 25 Electromagnetic control valve 26 Shuttle valve 27 Electromagnetic switching valve 28 Low pressure side control valve 31 Clutch 241 Input port 242 Spring 271 Current port 272 Output port 281 First input port 282 Second input port 283 Spring a Supply line

Claims (4)

A plurality of electromagnetic control valves that receive line pressure and output hydraulic pressure;
A shuttle valve that is connected to the plurality of electromagnetic control valves and outputs the maximum hydraulic pressure among the plurality of hydraulic pressures output from the plurality of electromagnetic control valves;
A control valve for controlling the line pressure to be an added pressure obtained by adding a predetermined margin pressure to the hydraulic pressure output from the shuttle valve;
An electromagnetic switching valve that switches whether the control valve controls the line pressure based on an input control current;
A hydraulic control device comprising: The electromagnetic switching valve applies a control pressure equal to the line pressure to the control valve when the control current is greater than a predetermined threshold, and the control valve when the control current is equal to or less than the predetermined threshold. The control pressure is not applied to the valve,
The hydraulic control device according to claim 1. The control valve discharges a part of oil on a hydraulic path connected to the electromagnetic control valve when the added pressure is equal to or lower than the control pressure, so that the line pressure becomes equal to the added pressure. It is characterized by controlling as
The hydraulic control device according to claim 2. The plurality of electromagnetic control valves output hydraulic pressure to a plurality of mechanism means controlled by pressure,
The electromagnetic switching valve is configured to switch whether the control valve controls the line pressure based on a hydraulic pressure that needs to be applied to the plurality of mechanism means.
The hydraulic control apparatus according to any one of claims 1 to 3.

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