Hydraulic control system and damping device

Abstract

The utility model relates to the technical field of hydraulic systems, and provides a hydraulic control system and a damping device. The hydraulic control system comprises a hydraulic cylinder and a driving oil way, wherein the hydraulic cylinder is provided with a rodless cavity and a rod cavity; the driving oil way comprises a first oil way, a second oil way, a third oil way and a fourth oil way, the third oil way and the fourth oil way are connected in parallel and are both connected between the first oil way and the second oil way, the first oil way is connected with the rodless cavity, and the second oil way is connected with the rod cavity; wherein the first oil way and the second oil way are each provided with a first flow adjusting valve, the third oil way is provided with a hydraulic pump, the driving oil way further comprises an energy accumulator, the energy accumulator is connected to the second oil way, and one of the third oil way and the fourth oil way can be selectively communicated with the first oil way and the second oil way. According to the hydraulic control system, the reverse dragging rotation risk and the reverse dragging rotation speed of the hydraulic pump during passive damping adjustment can be reduced, and the damping adjustment precision is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic systems, in particular to a hydraulic control system and a damping device. BACKGROUND

[0002] Active hydraulic actuation systems are widely used in active damping adjustment and active clearance control of automobile shock absorbers, driving of mechanical arms of engineering machinery, folding and unfolding control of aircraft landing gears, motion control of robot motion mechanisms, active control of displacement or driving force of motion test equipment, and the like. Controllable displacement, driving force, driving torque, or damping size and response speed of the active hydraulic actuation systems are pipe characteristics.

[0003] In related technologies, a hydraulic pump is usually used to provide active driving force in the hydraulic actuation system. However, when passive damping adjustment is performed, the hydraulic pump usually produces uncontrollable reverse dragging rotation under the action of external pressure difference, thereby reducing the control accuracy of damping force. CONTENT OF THE INVENTION

[0004] Therefore, it is necessary to provide a hydraulic control system capable of reducing the reverse dragging rotation risk and speed of the hydraulic pump during passive damping adjustment, improving the protection of the hydraulic pump, and ensuring the damping adjustment accuracy.

[0005] A hydraulic control system comprises a hydraulic cylinder and a driving oil circuit. The hydraulic cylinder has a rodless cavity and a rod cavity. The driving oil circuit comprises a first oil circuit, a second oil circuit, a third oil circuit, and a fourth oil circuit. The third oil circuit and the fourth oil circuit are connected in parallel and connected between the first oil circuit and the second oil circuit. The first oil circuit is connected to the rodless cavity, and the second oil circuit is connected to the rod cavity. First flow regulating valves are arranged on the first oil circuit and the second oil circuit. A hydraulic pump is arranged on the third oil circuit. The driving oil circuit further comprises an accumulator connected to the second oil circuit. The third oil circuit and the fourth oil circuit can be selectively connected to the first oil circuit and the second oil circuit.

[0006] It can be understood that, since the third oil circuit and the fourth oil circuit can be selectively connected to the first oil circuit and the second oil circuit, and the hydraulic pump is arranged on the third oil circuit, when the fourth oil circuit is connected between the first oil circuit and the second oil circuit, the hydraulic pump is disconnected or short-circuited with respect to the first oil circuit and the second oil circuit. Therefore, the oil between the rodless cavity and the rod cavity does not need to pass through the hydraulic pump, thereby ensuring that the pressure difference between the oil inlet and the oil outlet of the hydraulic pump is small. In this way, the reverse dragging rotation risk and speed of the hydraulic pump under the action of the pressure difference can be reduced, the damping adjustment accuracy can be ensured, and the protection of the hydraulic pump can be improved. At the same time, due to such a configuration, the first oil circuit, the fourth oil circuit, and the second oil circuit can be used to form an oil circuit for damping adjustment of the rodless cavity and the rod cavity, thereby meeting the passive adjustment of small damping.

[0007] In one of the embodiments, the hydraulic control system further comprises a control valve, the third oil passage and / or the fourth oil passage, or the intersection of the third oil passage and the fourth oil passage is provided with the control valve, the control valve is used to control the third oil passage and the fourth oil passage to selectively communicate with the first oil passage and the second oil passage.

[0008] In one of the embodiments, the control valve has a port A, a port B and a port C, the port B and the port C can selectively communicate with the port A; the port A is connected with the first oil passage or the second oil passage, the port B is connected with the third oil passage, and the port C is connected with the fourth oil passage.

[0009] In one of the embodiments, the control valve is a second flow regulating valve, and the second flow regulating valve is arranged in the fourth oil passage.

[0010] In one of the embodiments, an accumulator oil passage is arranged between the accumulator and the second oil passage, and a third flow regulating valve is arranged on the accumulator oil passage.

[0011] In one of the embodiments, the hydraulic pump is a bidirectional hydraulic pump.

[0012] In one of the embodiments, the first oil passage further comprises a first check valve, and the second oil passage further comprises a second check valve, the first check valve and the second check valve are both connected in parallel with the corresponding first flow regulating valve, the first check valve is used to guide the oil to flow from the third oil passage or the fourth oil passage to the rodless chamber, and the second check valve is used to guide the oil to flow from the third oil passage or the fourth oil passage to the rod chamber.

[0013] In one of the embodiments, the first oil passage further comprises a third check valve, and the second oil passage further comprises a fourth check valve, the third check valve and the fourth check valve are both connected in parallel with the corresponding first flow regulating valve, the third check valve is used to guide the oil to flow from the rodless chamber to the third oil passage or the fourth oil passage, and the fourth check valve is used to guide the oil to flow from the rod chamber to the third oil passage or the fourth oil passage.

[0014] In one of the embodiments, the first oil passage and the second oil passage both further comprise a throttle valve, and the throttle valve is connected in parallel with the first flow regulating valve.

[0015] The application further provides a damping device comprising the hydraulic control system. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0017] Figure 1 The first schematic diagram of the hydraulic control system provided by an embodiment of the present application;

[0018] Figure 2 The second schematic diagram of the hydraulic control system provided by an embodiment of the present application;

[0019] Figure 3 The third schematic diagram of the hydraulic control system provided by an embodiment of the present application;

[0020] Figure 4 The fourth schematic diagram of the hydraulic control system provided by an embodiment of the present application;

[0021] Figure 5 The first schematic diagram of the hydraulic control system provided by another embodiment of the present application;

[0022] Figure 6 The second schematic diagram of the hydraulic control system provided by another embodiment of the present application;

[0023] Figure 7 The third schematic diagram of the hydraulic control system provided by another embodiment of the present application;

[0024] Figure 8 The fourth schematic diagram of the hydraulic control system provided by another embodiment of the present application;

[0025] Figure 9 The fifth schematic diagram of the hydraulic control system provided by another embodiment of the present application.

[0026] The accompanying drawings are as follows: 10, hydraulic cylinder; 11, piston; 12, piston rod; 20, driving oil way; 21, first oil way; 22, second oil way; 23, third oil way; 24, fourth oil way; 25, accumulator; 26, hydraulic pump; 27, control valve; 30, controller; 101, rodless cavity; 102, rod cavity; 201, first flow regulating valve; 202, throttle valve; 203, filter; 204, stop valve; 205, oil filling port hydraulic lock; 206, third flow regulating valve; 211, first check valve; 212, third check valve; 221, second check valve; 222, fourth check valve; 231, pressure sensor; 251, accumulator oil way; 252, inflation valve; 261, motor. DETAILED DESCRIPTION

[0027] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the detailed description of the specific embodiments of the present application is made below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and one of ordinary skill in the art can make similar improvements without departing from the scope of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0028] It should be noted that when a component is referred to as being "on" or "disposed on" another component, it can be directly on the other component or there can be intervening components. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be intervening components. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used in the description of the specification are for the purpose of illustration only and do not indicate an exclusive embodiment.

[0029] In addition, the terms "first", "second", and the like, are used only to describe the purpose of the description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0030] In the present application, unless otherwise explicitly specified and limited, the "on", "under", "above" and "over" of the first feature to the second feature can be that the first feature is in direct contact with the second feature, or the first feature is indirectly in contact with the second feature through an intermediate medium. Moreover, the "on", "above" and "over" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by one skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the related listed items.

[0032] Please refer to Figure 1 and Figure 5An embodiment of the present application provides a hydraulic control system, comprising a hydraulic cylinder 10 and a driving oil circuit 20, the hydraulic cylinder 10 has a rodless cavity 101 and a rod cavity 102; the driving oil circuit 20 comprises a first oil circuit 21, a second oil circuit 22, a third oil circuit 23 and a fourth oil circuit 24, the third oil circuit 23 and the fourth oil circuit 24 are connected in parallel and are connected between the first oil circuit 21 and the second oil circuit 22, the first oil circuit 21 is connected with the rodless cavity 101, and the second oil circuit 22 is connected with the rod cavity 102; wherein the first oil circuit 21 and the second oil circuit 22 are both provided with a first flow regulating valve 201, the third oil circuit 23 is provided with a hydraulic pump 26, the driving oil circuit 20 further comprises an energy accumulator 25, the energy accumulator 25 is connected to the second oil circuit 22, and the third oil circuit 23 and the fourth oil circuit 24 can be selectively connected between the first oil circuit 21 and the second oil circuit 22.

[0033] The hydraulic cylinder 10 comprises a cylinder body, a piston 11 arranged on the cylinder body and a piston rod 12 connected to the piston 11, and the piston rod 12 is connected to a load.

[0034] It can be understood that, since the third oil circuit 23 and the fourth oil circuit 24 can be selectively connected between the first oil circuit 21 and the second oil circuit 22, and the hydraulic pump 26 is arranged on the third oil circuit 23, when the fourth oil circuit 24 is connected between the first oil circuit 21 and the second oil circuit 22, the hydraulic pump 26 is equivalent to being disconnected or short-circuited with respect to the first oil circuit 21 and the second oil circuit 22, so that the oil between the rodless cavity 101 and the rod cavity 102 does not need to pass through the hydraulic pump 26, thereby ensuring that the pressure difference between the oil inlet and the oil outlet of the hydraulic pump 26 is small. In this way, the risk of reverse rotation and the reverse rotation speed of the hydraulic pump 26 under the action of the pressure difference can be reduced, and the damping adjustment accuracy can be ensured. At the same time, due to such arrangement, the first oil circuit, the fourth oil circuit and the second oil circuit can be used to form an oil circuit for damping adjustment of the rodless cavity and the rod cavity, and passive adjustment of small damping can be achieved.

[0035] It can be understood that in the related art, the hydraulic pump is usually connected in series between the rodless chamber and the rod chamber to provide active power for the active adjustment of large damping. When active adjustment is needed, the hydraulic pump is started to provide power. When passive adjustment of small damping is needed, the hydraulic pump needs to be closed so that the hydraulic pump does not actively drive the oil. However, due to the series connection of the hydraulic pump, even when passive adjustment is needed, the oil still needs to flow through the hydraulic pump for circulation. For example, when the piston moves towards the rodless chamber under the action of the load to extrude the oil in the rodless chamber, the oil flows out of the rodless chamber, so that the oil port pressure of the hydraulic pump towards the rodless chamber is greater than the oil port pressure towards the rod chamber, and the hydraulic pump is reversely dragged. In view of this, the hydraulic control system provided in the embodiment can disconnect or short-circuit the hydraulic pump 26 relative to the first oil path 21 and the second oil path 22 during passive adjustment, so as to reduce the risk of reverse rotation of the hydraulic pump 26 under the action of pressure difference and the reverse rotation speed, and ensure the damping adjustment accuracy.

[0036] Moreover, since the accumulator 25 is connected to the second oil path 22, that is, connected to the rod chamber 102 side of the hydraulic cylinder 10, at this time, since no accumulator is arranged on the first oil path 21, it is equivalent to that no accumulator needs to be arranged on the rodless chamber 101 side of the hydraulic cylinder 10, so that the oil can fully flow to the rodless chamber 101 after passing through the hydraulic pump 26, and the response speed is improved.

[0037] It can be understood that the hydraulic cylinder 10 includes a cylinder body, a piston 11 arranged in the cylinder body, and a piston rod 12 connected to the piston 11, and the piston rod 12 is connected to the load. When the piston 11 moves towards the rodless chamber 101 side under the action of the load, in order to balance the load, the drive oil path 20 needs to deliver high-pressure oil to the rodless chamber 101 to quickly respond and play a buffering effect. At this time, if an accumulator is arranged on the rodless chamber 101 side, under the action of the first flow regulating valve 201 on the first oil path 21, part of the oil may flow into the accumulator preferentially. Therefore, in the embodiment, no accumulator is connected to the first oil path 21, so that the oil passing through the hydraulic pump 26 can fully and quickly flow to the rodless chamber 101, and the response speed is improved.

[0038] In addition, when the first flow regulating valve 201 on the first oil path 21 and the second oil path 22 are both adjusted to the minimum opening degree, the movement of the piston 11 can be locked.

[0039] It should be noted that the first flow regulating valve 201 is used to adjust the flow passage cross-sectional size of the oil flowing through the first oil path 21 or the second oil path 22, so as to adjust the oil pressure. The first flow regulating valve 201 can be a variable throttle valve.

[0040] It should be further noted that the hydraulic pump 26 is a bidirectional hydraulic pump, and the oil control can be achieved by the forward and reverse rotation of the hydraulic pump 26 itself.

[0041] Please continue to see Figure 1 and Figure 5 In some embodiments, the hydraulic control system further comprises a control valve 27, which is arranged at the intersection of the third oil line 23 and the fourth oil line 24, or at the third oil line 23 and / or the fourth oil line 24, and is used to control the communication between the third oil line 23 and the fourth oil line 24 and the first oil line 21 and the second oil line 22. That is, the arrangement of the control valve 27 is more conducive to the user to adjust the third oil line 23 and the fourth oil line 24. The control valve 27 can be a solenoid valve, which can be operated more conveniently through remote control and the like. The following will be described in detail in combination with the arrangement of the control valve 27.

[0042] Please see Figures 1 to 3 In some embodiments, the control valve 27 has a port A, a port B and a port C, the port B and the port C can be selectively communicated with the port A; the port A is connected with the first oil line 21 or the second oil line 22, the port B is connected with the third oil line 23, and the port C is connected with the fourth oil line 24. That is, the control valve 27 can adopt a three-way valve, for example, a two-position three-way valve. The valve core of the control valve 27 has an upper position and a lower position, when the valve core of the control valve 27 is in the upper position, the port B and the port A are communicated, and the port C is closed, at this time, one end of the third oil line 23 is communicated with the first oil line 21, the other end is communicated with the second oil line 22, and the fourth oil line 24 is disconnected. Conversely, when the valve core of the control valve 27 is in the lower position, the port C and the port A are communicated, and the port B is closed, at this time, one end of the fourth oil line 24 is communicated with the first oil line 21, the other end is communicated with the second oil line 22, and the third oil line 23 is disconnected. Through such design, the user can conveniently select the third oil line 23 or the fourth oil line 24 to be communicated between the first oil line 21 and the second oil line 22 through the switching of the control valve 27, so as to realize flexible control of the hydraulic system. In addition, the use of the two-position three-way valve also makes the structure of the entire hydraulic system more compact and the operation more convenient.

[0043] In actual use, when the piston 11 needs larger damping or needs to provide active actuation force (hereinafter referred to as active adjustment), the valve core of the control valve 27 is adjusted to the upper position; conversely, when the damping required by the piston 11 is not high or does not need to provide active actuation force (hereinafter referred to as passive adjustment), the valve core of the control valve 27 is adjusted to the lower position, and then the hydraulic pump 26 is disconnected relative to the first oil line 21 and the second oil line 22, so as to avoid the hydraulic pump 26 being reversely dragged to rotate.

[0044] The control valve 27 can be arranged at the intersection of the fourth oil path 24 and the first oil path 21 and connected to the third oil path 23 through the port B, or arranged at the intersection of the third oil path 23 and the first oil path 21 and connected to the fourth oil path 24 through the port C. Alternatively, the control valve 27 can be arranged at the intersection of the fourth oil path 24 and the second oil path 22, or at the intersection of the third oil path 23 and the second oil path 22. Alternatively, the control valve 27 can be arranged at the intersection of the fourth oil path 24 and the first oil path 21 and at the intersection of the fourth oil path 24 and the second oil path 22. Alternatively, the control valve 27 can be arranged at the intersection of the third oil path 23 and the first oil path 21 and at the intersection of the third oil path 23 and the second oil path 22. Alternatively, the control valve 27 can be arranged at the intersection of the fourth oil path 24 and the first oil path 21 and at the intersection of the third oil path 23 and the second oil path 22. The above is only an example.

[0045] Referring to Figures 5 to 8 In some embodiments, the control valve 27 is a second flow regulating valve. That is, the second flow regulating valve can be used to not only switch the oil paths, but also adjust the flow size according to the actual needs by adjusting the cross-sectional area of the oil path. The second flow regulating valve can also be a variable throttle valve.

[0046] For example, the second flow regulating valve is arranged at the fourth oil path 24. When the opening of the second flow regulating valve is adjusted to the maximum, the pressure difference between the inlet and outlet of the hydraulic pump 26 is close to 0, that is, the pressure difference between the inlet and outlet of the hydraulic pump 26 is small, which reduces the risk of the hydraulic pump 26 being dragged in the opposite direction under the action of the pressure difference, thereby causing the hydraulic pump 26 to be in a "short circuit" state, and the fourth oil path 24 is connected between the first oil path 21 and the second oil path 22. At this time, it is suitable for the case where the piston 11 has small damping or does not need to provide active actuation force. Conversely, when the piston 11 needs large damping or needs to provide active actuation force, the opening of the second flow regulating valve is adjusted to the minimum opening, and the hydraulic pump 26 is started to control the amount of hydraulic oil in the rodless chamber 101, that is, to realize damping control or active actuation.

[0047] It can be understood that the opening of the second flow regulating valve can be adjusted to meet the short circuit of the hydraulic pump 26 relative to the first oil path 21 and the second oil path 22, which is simple in structure and convenient to adjust.

[0048] In other embodiments, second flow regulating valves are provided at the inlet and outlet of the hydraulic pump 26, and in passive regulation, the two second flow regulating valves are closed to the minimum, almost 0, to ensure that the oil does not flow through the hydraulic pump 26 as much as possible, reducing the risk of reverse drag rotation. Of course, in the case where the inlet and outlet of the hydraulic pump 26 are provided with stop valves, i.e. the control valve 27 is a stop valve, and in passive regulation, the hydraulic pump 26 is disconnected from the first oil circuit 21 and the second oil circuit 22, which can also reduce the risk of reverse drag rotation of the hydraulic pump 26. This is only an example.

[0049] In actual use, the hydraulic pump 26 is connected with a motor 261 to drive the hydraulic pump 26 to operate. The hydraulic control system further comprises a controller 30 electrically connected with the control valve 27 described above, for adjusting the state of the control valve 27. When the control valve 27 is a two-position three-way valve, it is used to adjust the spool to be in the upper position or the lower position; when the control valve 27 is a second flow regulating valve, it is used to adjust the opening to be larger or smaller.

[0050] As shown in Figure 8 In some embodiments, an accumulator oil circuit 251 is provided between the accumulator 25 and the second oil circuit 22, and a third flow regulating valve 206 is provided on the accumulator oil circuit 251. It can be understood that due to the arrangement of the piston 11, a part of the volume in the rod cavity 102 is occupied, so that the pressure bearing areas in the rod cavity 102 and the rodless cavity 101 are different. During the movement of the piston 11, the volume change amounts of the oil in the rodless cavity 101 and the rod cavity 102 are also different. When the third flow regulating valve 206 is adjusted to the minimum opening, it is equivalent to cutting off the accumulator oil circuit 251, thereby disconnecting the accumulator 25 and the second oil circuit 22, so that there is no volume compensation capacity in the entire hydraulic control system, achieving the cut-off of the hydraulic oil flow and maintaining the position of the piston 11.

[0051] Please refer to Figure 1 and Figure 5 In some embodiments, the first oil circuit 21 further comprises a first one-way valve 211, and the second oil circuit 22 further comprises a second one-way valve 221, both of which are connected in parallel with the respective first flow regulating valve 201. The first one-way valve 211 is used to guide the oil to flow from the third oil circuit 23 or the fourth oil circuit 24 to the rodless cavity 101, and the second one-way valve 221 is used to guide the oil to flow from the third oil circuit 23 or the fourth oil circuit 24 to the rod cavity 102. It can be understood that by providing the first one-way valve 211 and the second one-way valve 221, the oil flow cross section to the rodless cavity 101 and the rod cavity 102 can be increased, the flow can be increased, and the response speed can be further improved.

[0052] Please refer to Figure 2 and Figure 6, further, the first oil path 21 further comprises a third one-way valve 212, and the second oil path 22 further comprises a fourth one-way valve 222, the third one-way valve 212 and the fourth one-way valve 222 are both in parallel with the first flow regulating valve 201, the third one-way valve 212 is used to guide the oil to flow from the rodless chamber 101 to the third oil path 23 or the fourth oil path 24, and the fourth one-way valve 222 is used to guide the oil to flow from the rod chamber 102 to the third oil path 23 or the fourth oil path 24. That is, by using the third one-way valve 212 and the fourth one-way valve 222, the oil flow cross section flowing out of the rodless chamber 101 and the rod chamber 102 is increased, and the response speed can also be improved. Moreover, if the first flow regulating valve 201 fails, the first one-way valve 211, the second one-way valve 221, the third one-way valve 212 and the fourth one-way valve 222 can cooperate with each other to realize oil circulation and damping adjustment.

[0053] Among them, the first one-way valve 211, the second one-way valve 221, the third one-way valve 212 and the fourth one-way valve 222 all adopt a one-way valve with an elastic element, which can be automatically opened when the oil pressure is greater than the opening pressure. For example, a spring type one-way valve.

[0054] Please refer to Figure 3 and Figure 7 In some embodiments, the first oil path 21 and the second oil path 22 further comprise a throttle valve 202 in parallel with the first flow regulating valve 201. The throttle valve 202 can reduce the damping of the piston 11 when moving at low speed, thereby cooperating with the aforementioned various one-way valves and the first flow regulating valve 201 to realize the adjustment of different dampings.

[0055] Please refer to Figure 4 and Figure 9 In still other embodiments, filters 203 can also be provided on the first oil path 21 and the second oil path 22 to filter impurities, iron filings and the like in the oil, and a stop valve 204 can also be provided on the side of the filter 203 away from the hydraulic cylinder 10, so as to shut off the oil path for maintenance, repair and the like. Meanwhile, oil filling ports hydraulic locks 205 can also be provided on the first oil path 21 and the second oil path 22 respectively, which are beneficial to supplement the oil. The accumulator 25 can be connected to the charging valve 252 for charging pressure compensation. The third oil path 23 is provided with pressure sensors 231 at both ends of the hydraulic pump 26, so as to detect the oil pressure at both ends of the hydraulic pump 26 in real time by providing pressure sensors 231 at the oil inlet and the oil outlet of the hydraulic pump 26.

[0056] As Figures 1 to 9As shown, the application also provides a damping device comprising the hydraulic control system. The damping device can be connected to a vehicle suspension to achieve vehicle damping. For example, the piston rod 12 of the hydraulic cylinder 10 in the hydraulic control system is connected to the vehicle body, and when the vehicle runs on a bumpy road, the damping requirement can be met. In this process, due to the alternative communication between the third oil way 23 and the fourth oil way 24 and the first oil way 21 and the second oil way 22, and the setting of the two first flow regulating valves 201, it is beneficial to maintain a small pressure difference between the inlet and outlet sides when the hydraulic pump 26 is not working, reduce the risk of reverse rotation and reverse rotation speed of the hydraulic pump 26 under the action of the pressure difference, ensure the damping adjustment accuracy, and improve the protection of the hydraulic pump 26.

[0057] The technical features of the above-mentioned embodiments can be combined in any way. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0058] The above-mentioned embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A hydraulic control system, characterized in that, include: The hydraulic cylinder (10) has a rodless chamber (101) and a rod chamber (102); The drive oil circuit (20) includes a first oil circuit (21), a second oil circuit (22), a third oil circuit (23) and a fourth oil circuit (24). The third oil circuit (23) and the fourth oil circuit (24) are connected in parallel and are both connected between the first oil circuit (21) and the second oil circuit (22). The first oil circuit (21) is connected to the rodless cavity (101), and the second oil circuit (22) is connected to the rod cavity (102). The first oil circuit (21) and the second oil circuit (22) are each equipped with a first flow regulating valve (201), the third oil circuit (23) is equipped with a hydraulic pump (26), the drive oil circuit (20) also includes an accumulator (25), the accumulator (25) is connected to the second oil circuit (22), and the third oil circuit (23) and the fourth oil circuit (24) can be selectively connected to the first oil circuit (21) and the second oil circuit (22).

2. The hydraulic control system according to claim 1, characterized in that, The hydraulic control system further includes a control valve (27), wherein the control valve (27) is provided at the intersection of the third oil passage (23) and / or the fourth oil passage (24), or at the intersection of the third oil passage (23) and the fourth oil passage (24), and the control valve (27) is used to control the third oil passage (23) and the fourth oil passage (24) to selectively connect to the first oil passage (21) and the second oil passage (22).

3. The hydraulic control system according to claim 2, characterized in that, The control valve (27) has a port A, a port B and a port C, wherein the port B and the port C can be selectively connected to the port A; The port A is connected to the first oil passage (21) or the second oil passage (22), the port B is connected to the third oil passage (23), and the port C is connected to the fourth oil passage (24).

4. The hydraulic control system according to claim 2, characterized in that, The control valve (27) is a second flow regulating valve, which is located in the fourth oil circuit (24).

5. The hydraulic control system according to claim 1, characterized in that, An accumulator oil passage (251) is provided between the accumulator (25) and the second oil passage (22), and a third flow regulating valve (206) is provided on the accumulator oil passage (251).

6. The hydraulic control system according to claim 1, characterized in that, The hydraulic pump (26) is a bidirectional hydraulic pump.

7. The hydraulic control system according to claim 1, characterized in that, The first oil circuit (21) further includes a first check valve (211), and the second oil circuit (22) further includes a second check valve (221). The first check valve (211) and the second check valve (221) are both connected in parallel with their respective first flow regulating valves (201). The first check valve (211) is used to guide the oil from the third oil circuit (23) or the fourth oil circuit (24) to the rodless chamber (101), and the second check valve (221) is used to guide the oil from the third oil circuit (23) or the fourth oil circuit (24) to the rod chamber (102).

8. The hydraulic control system according to claim 1 or 7, characterized in that, The first oil circuit (21) further includes a third check valve (212), and the second oil circuit (22) further includes a fourth check valve (222). The third check valve (212) and the fourth check valve (222) are both connected in parallel with their respective first flow regulating valves (201). The third check valve (212) is used to guide the oil from the rodless chamber (101) to the third oil circuit (23) or the fourth oil circuit (24), and the fourth check valve (222) is used to guide the oil from the rod chamber (102) to the third oil circuit (23) or the fourth oil circuit (24).

9. The hydraulic control system according to claim 8, characterized in that, Both the first oil circuit (21) and the second oil circuit (22) further include a throttle valve (202), which is connected in parallel with the first flow regulating valve (201).

10. A vibration damping device, characterized in that, The hydraulic control system includes any one of claims 1 to 9.

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