Adjustable damping valve and vehicle hydraulic interconnected suspension system

Abstract

The present invention discloses an adjustable damping valve, including a valve body, a sliding column, a reset spring for sliding column reset, and a driving structure for driving sliding column to move. The valve body is provided with two oil ports for connecting the oil circuit, the sliding column is movably arranged in the valve body, and the valve body and the sliding column are provided with a group of throttle holes with different apertures for connecting the two oil ports. A hydraulic interconnected suspension system includes a front left hydraulic cylinder, a front right hydraulic cylinder, a rear left hydraulic cylinder, and a rear right hydraulic cylinder of the suspension. The rod chamber of the front left hydraulic cylinder, the rodless chamber of the front right hydraulic cylinder, the rod chamber of the rear left hydraulic cylinder, and the rodless chamber of the rear right hydraulic cylinder are connected to form a hydraulic circuit a; the rodless chamber of the front left hydraulic cylinder, the rod chamber of the front right hydraulic cylinder, the rodless chamber of the rear left hydraulic cylinder, and the rod chamber of the rear right hydraulic cylinder are connected to form a hydraulic circuit b; and an adjustable damping valve is provided in both hydraulic circuit a and hydraulic circuit b. It can realize adjustable damping, so that the damping characteristics of the system adapt to the motion state of the whole vehicle.

Description

Technical Field

[0001] The present invention relates to the field of vehicle hydraulic technology, and in particular to an adjustable flow damping valve and a vehicle hydraulic interconnected suspension system. Background Art

[0002] The hydraulic interconnected suspension system consists of hydraulic cylinders, hydraulic pipelines, accumulators, damping valves and other components. The hydraulic cylinder is located between the four wheels and the vehicle body, with one end fixed to the vehicle body and the other end fixed to the wheel. The four hydraulic cylinders are interconnected in a certain way to form two closed hydraulic circuits. Each closed circuit is equipped with at least one accumulator and at least one or no damping device.

[0003] For hydraulic interconnected suspension systems with damping valve devices, the damping valves can be selected in a variety of forms, such as disc valves, rod valves, plunger valves and sheet valves, as long as they can meet the required damping force value. However, the valves set in the existing hydraulic interconnected suspension system can only provide fixed damping values; for example, the sheet valve in the hydraulic interconnected suspension system provides the tensile and compressive damping forces required during the operation of the vehicle; the existing sheet valve has a fixed valve opening size at a fixed speed point, that is, it can only provide a fixed damping force value at a fixed speed point.

[0004] Therefore, the existing hydraulic interconnected suspension system can only provide the vehicle with a damping force that changes according to a set curve during vehicle operation, and cannot achieve real-time adjustable damping determined according to working conditions. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an adjustable damping valve and a vehicle hydraulic interconnected suspension system, which can achieve adjustable damping and adapt the system damping characteristics to the motion state of the entire vehicle.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] An adjustable damping valve comprises a valve body, the valve body is provided with two oil ports for connecting an oil circuit, a sliding column and a return spring for returning the sliding column, and a driving structure for driving the sliding column to move. The sliding column is movably arranged in the valve body, and the valve body and the sliding column are provided with a group of throttling holes with different apertures for connecting the two oil ports.

[0008] The valve body is provided with a sliding hole, in which the sliding column is movably arranged, and both ends of the valve body are provided with sealing members for preventing the oil in the valve body from leaking out.

[0009] A spring fixing seat is provided at one end of the valve body, one end of the return spring is connected to the spring fixing seat, the other end of the return spring is connected to one end of the sliding column, and the driving structure is arranged corresponding to the other end of the sliding column.

[0010] The valve body is provided with two groups of flow holes, which are respectively connected to corresponding oil ports; each group of flow holes includes two or more flow holes of different apertures arranged side by side, and the sliding column is provided with a through hole for connecting the two groups of flow holes.

[0011] The sliding column is provided with one or more flow holes with different hole diameters. One oil port of the valve body is provided corresponding to one end of the connecting flow hole, and the other oil port of the valve body is provided corresponding to the other end of the connecting flow hole.

[0012] The spring fixing seat is provided with a groove, and one end of the return spring is arranged in the groove; the other end of the return spring is sleeved on one end of the sliding column or one end of the sliding column is provided with a recessed groove, and the other end of the return spring is arranged in the recessed groove.

[0013] The two groups of flow holes on the valve body are arranged radially along the valve body, the flow holes and the oil port connecting channel are arranged axially along the valve body, the two groups of flow holes are arranged oppositely, and the aperture of the through hole on the sliding column is larger than the aperture of the flow hole.

[0014] A vehicle hydraulic interconnected suspension system includes a front left hydraulic cylinder, a front right hydraulic cylinder, a rear left hydraulic cylinder and a rear right hydraulic cylinder of the suspension.

[0015] The rod chamber of the front left hydraulic cylinder, the rodless chamber of the front right hydraulic cylinder, the rod chamber of the rear left hydraulic cylinder and the rodless chamber of the rear right hydraulic cylinder are connected to form a hydraulic circuit a;

[0016] The rodless chamber of the front left hydraulic cylinder, the rod chamber of the front right hydraulic cylinder, the rodless chamber of the rear left hydraulic cylinder and the rod chamber of the rear right hydraulic cylinder are connected to form a hydraulic circuit b;

[0017] The adjustable damping valve is provided in both the hydraulic circuit a and the hydraulic circuit b; and the corresponding hydraulic circuit a and the hydraulic circuit b are both connected to an accumulator;

[0018] The accumulator comprises an accumulator a and an accumulator b, a damping valve a in front of the accumulator is provided between the hydraulic circuit a and the accumulator a, and a damping valve b in front of the accumulator is provided between the hydraulic circuit b and the accumulator b;

[0019] A balancing valve is provided between the hydraulic circuit a and the hydraulic circuit b.

[0020] A fixed flow damping valve is provided in the hydraulic circuit a and / or the hydraulic circuit b, and the corresponding fixed flow damping valve and the adjustable damping valve are arranged in series or in parallel.

[0021] The vehicle is provided with a vehicle condition sensor and a central processing unit. The vehicle collects working condition signals through the vehicle condition sensor and then transmits the signals to the central processing unit. The central processing unit processes and analyzes the signals and issues execution instructions to the adjustable damping valve. The adjustable damping valve changes the flow rate connected to the hydraulic interconnected suspension system to achieve flow graded control. Finally, the hydraulic interconnected suspension system provides different damping force values ​​to the vehicle according to the working conditions.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] The adjustable damping valve and the vehicle hydraulic interconnected suspension system are reasonably designed. By changing the form of the damping valve, the system flow rate can be controlled in stages, and ultimately the damping can be adjusted in multiple stages. The damping can be adjusted in real time according to the movement state of the vehicle, so that the damping characteristics of the hydraulic interconnected suspension system can adapt to the movement state of the vehicle and achieve the best comfort state. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following is a brief description of the contents and symbols in the drawings of this specification:

[0025] Figure 1 The figure is a structural schematic diagram of the adjustable damping valve of the present invention.

[0026] Figure 2 Another structural schematic diagram of the adjustable damping valve of the present invention.

[0027] Figure 3 This is another structural schematic diagram of the adjustable damping valve of the present invention.

[0028] Figure 4 It is a schematic flow chart of the control principle of the present invention.

[0029] Figure 5 It is a connection diagram of the system of the present invention. DETAILED DESCRIPTION

[0030] The specific implementation modes of the present invention will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0031] like Figure 4 and Figure 5As shown, the vehicle hydraulic interconnected suspension system includes a front left hydraulic cylinder 1a, a front right hydraulic cylinder 1b, a rear left hydraulic cylinder 1c and a rear right hydraulic cylinder 1d of the suspension; the rod chamber of the front left hydraulic cylinder, the rodless chamber of the front right hydraulic cylinder, the rod chamber of the rear left hydraulic cylinder and the rodless chamber of the rear right hydraulic cylinder are connected to form a hydraulic circuit a; the rodless chamber of the front left hydraulic cylinder, the rod chamber of the front right hydraulic cylinder, the rodless chamber of the rear left hydraulic cylinder and the rod chamber of the rear right hydraulic cylinder are connected to form a hydraulic circuit b; adjustable flow damping valves are provided in both hydraulic circuit a and hydraulic circuit b; and accumulators are connected to the corresponding hydraulic circuit a and hydraulic circuit b.

[0032] The accumulator includes accumulator 9a and accumulator 9b. A damping valve 8a in front of the accumulator is provided between hydraulic circuit a and accumulator 9a, and a damping valve 8b in front of the accumulator is provided between hydraulic circuit b and accumulator 9b. The damping valve in front of the accumulator produces a damping effect on the liquid in and out of the accumulator, thereby attenuating the shaking of the vehicle.

[0033] Each hydraulic cylinder connection end of hydraulic circuit a and hydraulic circuit b is provided with an adjustable flow damping valve V2. Further, each hydraulic cylinder connection end of hydraulic circuit a and / or hydraulic circuit b is provided with a fixed flow damping valve, and the corresponding fixed flow damping valve and the adjustable flow damping valve are arranged in series, or the corresponding fixed flow damping valve and the adjustable flow damping valve are arranged in parallel.

[0034] The rod chamber of the front left hydraulic cylinder and the rodless chamber of the front right hydraulic cylinder are connected to form a front hydraulic circuit a3, and the rod chamber of the rear left hydraulic cylinder and the rodless chamber of the rear right hydraulic cylinder are connected to form a rear hydraulic circuit a6. The front hydraulic circuit a and the rear hydraulic circuit a are connected by a connecting pipe a4, and the accumulator 9a and the damping valve 8a in front of the accumulator are correspondingly connected to the connecting pipe a4.

[0035] The rodless chamber of the front left hydraulic cylinder and the rod chamber of the front right hydraulic cylinder are connected to form a front hydraulic circuit b2, and the rodless chamber of the rear left hydraulic cylinder and the rod chamber of the rear right hydraulic cylinder are connected to form a rear hydraulic circuit b7. The front hydraulic circuit b and the rear hydraulic circuit b are connected by a connecting pipe b5, and the accumulator 9b and the damping valve 8b in front of the accumulator are correspondingly connected to the connecting pipe b5.

[0036] One end of the front hydraulic circuit a is connected to the rod chamber of the front left hydraulic cylinder 1a through an adjustable flow damping valve and a fixed flow damping valve 10a1 connected in series, and the other end of the front hydraulic circuit a is connected to the rodless chamber of the front right hydraulic cylinder 1b through an adjustable flow damping valve and a fixed flow damping valve 10b1 connected in series; one end of the rear hydraulic circuit a is connected to the rod chamber of the rear left hydraulic cylinder 1c through an adjustable flow damping valve and a fixed flow damping valve 10c2 connected in series, and the other end of the rear hydraulic circuit a is connected to the rodless chamber of the rear right hydraulic cylinder 1d through an adjustable flow damping valve and a fixed flow damping valve 10d1 connected in series.

[0037] One end of the front hydraulic circuit b is connected to the rodless chamber of the front left hydraulic cylinder 1a through an adjustable flow damping valve and a fixed flow damping valve 10a2 connected in series, and the other end of the front hydraulic circuit b is connected to the rod chamber of the front right hydraulic cylinder 1b through an adjustable flow damping valve and a fixed flow damping valve 10b2 connected in series; one end of the rear hydraulic circuit b is connected to the rodless chamber of the rear left hydraulic cylinder 1c through an adjustable flow damping valve and a fixed flow damping valve 10c1 connected in series, and the other end of the rear hydraulic circuit b is connected to the rod chamber of the rear right hydraulic cylinder 1d through an adjustable flow damping valve and a fixed flow damping valve 10d2 connected in series.

[0038] All adjustable flow damping valves V2 in hydraulic circuit a and hydraulic circuit b are connected to the vehicle's control unit. The adjustable damping valve receives the signal from the central processor and adjusts the aperture size connected to the hydraulic interconnected suspension system to achieve flow control and thus damping force adjustment.

[0039] A balancing valve is connected between the connecting pipeline a and the connecting pipeline b. A balancing valve V1 is connected between the two circuits a and b. The function of the balancing valve is to ensure that the two circuits are connected within a certain pressure threshold. After exceeding the pressure threshold, the two circuits are disconnected.

[0040] The preferred specific examples of the system are:

[0041] The hydraulic interconnected suspension system of the present invention includes hydraulic cylinders, a front left hydraulic cylinder, a front right hydraulic cylinder, a rear left hydraulic cylinder, and a rear right hydraulic cylinder, which are actuating devices of the hydraulic suspension and exert force on the vehicle body and wheels. Depending on the number of axles of the vehicle and the number of spring supports, the number of hydraulic cylinders on the front axle can be 2 or 4 or other, and the number of hydraulic cylinders on the rear axle can be 2 or 4 or other. In principle, the number of hydraulic cylinders is consistent with the number of spring supports of the vehicle. The present invention takes the example that the number of hydraulic cylinders on the front axle is 2 and the number of hydraulic cylinders on the rear axle is 2 to describe the invention scheme.

[0042] The system includes hydraulic pipelines connecting the front, rear, left and right hydraulic cylinders. The hydraulic pipelines include two main lines: line a and line b. Line a connects the rod cavity of the front left actuator, the rodless cavity of the front right actuator, the rod cavity of the rear left actuator, and the rodless cavity of the rear right actuator. Line b connects the rodless cavity of the front left actuator, the rod cavity of the front right actuator, the rodless cavity of the rear left actuator, and the rod cavity of the rear right actuator.

[0043] The left accumulator is connected to the hydraulic pipeline b, and the left accumulator damping valve has a damping effect on the liquid in and out of the left accumulator, thereby attenuating the vehicle shaking; the right accumulator is connected to the hydraulic pipeline a, and the right accumulator damping valve has a damping effect on the liquid in and out of the right accumulator, thereby attenuating the vehicle shaking.

[0044] In the hydraulic interconnected suspension system, the adjustable damping valve device is connected to the upper chamber and the lower chamber of all hydraulic cylinders, and can also be connected only to the upper chamber or only to the lower chamber as required. If the hydraulic interconnected suspension system has an existing fixed flow damping valve, the adjustable damping valve device is connected to the system in series or in parallel with the existing fixed flow damping valve; if there is no existing fixed flow damping valve, the adjustable damping valve device can be connected to the system alone.

[0045] The adjustable damping valve receives the signal from the central processor and realizes flow control by adjusting the aperture size connected to the hydraulic interconnected suspension system, thereby realizing damping force adjustment.

[0046] like Figures 1 to 3 As shown, the adjustable flow damping valve includes a valve body, which is provided with two oil ports for connecting the oil circuit, a sliding column and a return spring for returning the sliding column, and a driving structure for driving the sliding column to move. The sliding column is movably arranged in the valve body, and the valve body and the sliding column are provided with a group of throttling holes with different apertures for connecting the two oil ports.

[0047] A sliding hole is arranged in the valve body, and a sliding column is movably arranged in the sliding hole. Both ends of the valve body are provided with sealing members for preventing oil in the valve body from leaking out.

[0048] One end of the valve body is provided with a spring fixing seat, one end of the return spring is connected to the spring fixing seat, the other end of the return spring is connected to one end of the sliding column, and the driving structure is arranged corresponding to the other end of the sliding column. Preferably, a groove is arranged in the spring fixing seat, one end of the return spring is arranged in the groove; the other end of the return spring is sleeved on one end of the sliding column or a recessed groove is arranged at one end of the sliding column, and the other end of the return spring is arranged in the recessed groove, and the structure is compact.

[0049] The valve body is provided with two groups of flow holes, which are respectively connected with corresponding oil ports; each group of flow holes includes two or more flow holes with different apertures arranged side by side, and the sliding column is provided with a through hole for connecting the two groups of flow holes; the two groups of flow holes on the valve body are arranged along the radial direction of the valve body, and the passage connecting the flow holes and the oil ports is arranged along the axial direction of the valve body, and the two groups of flow holes are arranged oppositely, and the aperture of the through hole on the sliding column is larger than the aperture of the flow hole. Or there is more than one flow hole on the sliding column, and the apertures of the flow holes are different, and one oil port of the valve body is arranged corresponding to one end of the flow hole connected, and the other oil port of the valve body is arranged corresponding to the other end of the flow hole connected.

[0050] Preferred specific examples are:

[0051] like Figure 1As shown, three flow holes n1, n2, and n3 with different apertures are provided on the valve body 101, and n1, n2, and n3 run through the valve body from top to bottom and are connected to the internal axial through hole. On both sides of the axial through hole, there is a transverse oil hole, connecting the flow holes n1, n2, and n3, and the peripheral oil ports of n1, n2, and n3 are closed with a plug 107 or other means, leaving only oil ports K1 and K2. K1 and K2 are connected to the hydraulic interconnected suspension system pipeline and are connected in series with the fixed flow damping valve. There are seals 105 at both ends of the axial through hole of the valve body 101, which are used to prevent the oil in the valve body 101 from leaking out during the sliding process of the sliding column 102.

[0052] There is a flow hole m1 with a larger aperture on the slide column 102. m1 does not participate in the flow control of the flow control valve, and is only controlled by the flow holes n1, n2 and n3 of the valve body 101. m1 has or does not have countersunk holes at both ends. There is a slide column boss 106 on the slide column 102, which is used to position the return spring 104. One side of the slide column 102 is connected to the spring fixing seat 103 through the return spring 104, and the other side is fixed to the electromagnetic valve or the motor, and the slide column is driven to move by the electromagnetic valve or the motor. There is a gap between the slide column 102 and the axial through hole of the valve body 101, and an oil film is formed on the surface of the slide column 102, which slides in the axial through hole of the valve body 101. When the gap between the slide column 102 and the axial through hole of the valve body 101 is small, the influence of the flow loss generated by the gap on the damping force value can be ignored; when the gap is large, the flow loss generated by the gap can be included in the calibration process of the damping force value and the flow size, so that this part of the flow is calculated into the total flow.

[0053] The slide post boss 106 is positioned with a groove or fixed with the return spring 104 in other ways. The relative position of the slide post boss 106 on the slide post needs to ensure that the boss does not interfere with the valve body 101 when the slide post 102 slides to the leftmost position.

[0054] The return spring 104 is sleeved on the slide column 102, with one side fixed to the slide column boss 106 and the other side connected to the spring fixing seat 103. The connection form can be positioning through a groove, or fixed, or other connection forms. In the case of failure of the driving mechanism or disconnection of the current, the slide column cannot be driven to move, and the return spring 104 can ensure that the slide column is located at the 0 position of the flow control valve, ensuring that the system can provide basic compression and tension damping force values.

[0055] The spring fixing seat 103 is connected to the valve body 101 , which may be threaded, welded or in other detachable connection forms.

[0056] The slide column 102 slides in the internal through hole of the valve body 101 and can correspond to the following 7 relative positions:

[0057] (1) Sliding column 2 is at position 0: the m1 hole and the n2 hole are fully connected. The flow rate at this time can be expressed as Q1 = n2;

[0058] (2) Sliding column 2 is located at the left position 1: hole m1 is connected to half of holes n1 and half of holes n2. The flow rate at this time can be expressed as Q2 = 1 / 2n1 + 1 / 2n2;

[0059] (3) Sliding column 2 is in the left 2 position: the m1 hole and the n1 hole are fully connected. The flow rate at this time can be expressed as Q3 = n1;

[0060] (4) Sliding column 2 is located at the left 3 position: hole m1 is connected to half of hole n1. The flow rate at this time can be expressed as Q4 = 1 / 2n1;

[0061] (5) Sliding column 2 is located at the right position 1: hole m1 is connected to half of holes n2 and half of holes n3. The connected flow rate at this time can be expressed as Q5 = 1 / 2n2 + 1 / 2n3;

[0062] (6) Sliding column 2 is in the right 2 position: the m1 hole and the n3 hole are fully connected. The flow rate at this time can be expressed as Q6 = n3;

[0063] (7) Sliding column 2 is located at the right 3 position: hole m1 is connected to half of hole n3. The flow rate at this time can be expressed as Q4 = 1 / 2n3;

[0064] That is, when three flow holes are opened on the valve body, the sliding column 102 moves in the valve body 101, and the flow adjustable damping valve can achieve 7 levels of flow adjustment. It should be noted that the 0 position, left 1 position, left 2 position, left 3 position, right 1 position, right 2 position, and right 3 position corresponding to the movement of the sliding column 102 in the figure only represent the position numbers in the example, and are not limited to the actual position information.

[0065] The other side of the sliding column 102 is fixed to the solenoid valve. The vehicle sensor transmits the signal to the ECU, and the ECU controls the current transmitted to the solenoid valve according to the set control strategy. The current signal of the solenoid valve changes, generating different magnetic field forces, so that the sliding column 102 moves to the set position, that is, different flow holes are connected, and the damping is adjustable in real time.

[0066] According to the comprehensive consideration of performance requirements, cost and processing difficulty, the number of flow adjustable levels can be increased or decreased accordingly by increasing or decreasing the number of flow holes on the valve body. Similarly, according to performance requirements and flow grading control strategy, for a flow control valve with a fixed number of flow holes, an adjustment gear less than the highest number can be set. For example, in the above embodiment, the number of flow holes is 3, and theoretically 7 levels of flow adjustment can be achieved, but the adjustable gears can be reduced to 6 gears or 5 gears, or other gears according to requirements. Reducing the gears is conducive to meeting the requirements of performance, cost, compactness of structure and processing difficulty at the same time.

[0067] The advantages of this solution are: it can achieve multi-level flow control in terms of performance, the flow control valve is easy to process, and the technology and products of the solenoid valve driving the sliding column to move the fixed gear position are relatively mature.

[0068] Figure 2 is another preferred embodiment. Figure 3 The difference between the embodiments is that the fixing position of the return spring is slightly different.

[0069] In this solution, one end of the sliding column 102 is connected to the electromagnetic valve, and the other end is provided with a groove of a certain depth. The return spring 104 is positioned and connected to the sliding column 102 through the groove. A sliding column boss 106 may or may not be provided around the sliding column 102 groove. The function of the sliding column boss 106 is to ensure that when the sliding column 102 slides to the leftmost position, the boss does not interfere with the valve body 101. If the sliding column boss 106 is not provided, the sliding column displacement can be accurately controlled by precise current input, and the relative position between the sliding column 102 and the valve body 101 can also be prevented from being abnormal.

[0070] Figure 3 This is another preferred embodiment. In this embodiment, the valve body does not participate in flow control, and the sliding column participates in flow control.

[0071] In this embodiment, the valve body 101 is provided with a relatively large flow hole n1, which also serves as the oil port K1 (K2) connected to the hydraulic interconnected suspension system. The valve body 1 does not participate in the flow control of the flow control valve.

[0072] The slide column 102 is a cylinder with different outer diameters. Three flow holes m1, m2 and m3 with different apertures are opened on the cylinder with a larger outer diameter in the middle. m1, m2 and m3 participate in the flow control of the flow control valve. When the slide column 102 moves to different positions, 1 / 2m1, m1, 1 / 2m1+1 / 2m2, m2, 1 / 2m2+1 / 2m3, m3 and 1 / 2m3 can be connected to the larger flow hole n1 respectively, and 7 levels of flow control can also be achieved. The cylinders with smaller outer diameters on both sides of the slide column 102 are connected to the solenoid valve on one side. By changing the current input to the solenoid valve, the slide column 102 can be moved left and right, and the flow hole can be selected. This side also needs to be sealed between the slide column 102 and the valve body 101 through the valve body sealing end cover 108 and the valve body seal 109 to ensure that there is no oil leakage. The two sides of the sliding column 102 are cylinders with smaller outer diameters, and the other side provides positioning for the return spring 104 and is fixed to the return spring 104 .

[0073] There is a gap between the larger outer diameter cylinder of the sliding column 102 and the axial through hole of the valve body 101. An oil film is formed on the surface of the larger outer diameter cylinder of the sliding column 102, and the sliding column slides in the axial through hole of the valve body 101. When the gap between the larger outer diameter cylinder of the sliding column 102 and the axial through hole of the valve body 101 is small, the influence of the flow loss generated by the gap on the damping force value can be ignored; when the gap is large, the flow loss generated by the gap can be included in the calibration process of the damping force value and the flow size, so that this part of the flow is calculated into the total flow.

[0074] The sliding column 102 can also be a cylinder with a smaller outer diameter in the middle and a cylinder with a larger outer diameter on both sides. The sliding column 102 can also be a cylinder with the same outer diameter. Accordingly, the valve body structure and the flow hole position can be changed to meet the requirements of sealing and flow selection. The above solutions all fall within the protection scope of this case.

[0075] One side of the return spring 104 is connected to the slide column 102, and the other side is connected to the spring fixing nut seat 103. In the case that the solenoid valve fails and cannot drive the slide column to move, the return spring 104 can ensure that the slide column is located in the middle position of the flow control valve, ensuring that the system can provide basic compression and extension damping force values.

[0076] The spring fixing nut seat 103 provides positioning and consolidation for the other side of the return spring 104. At the same time, it is connected to the valve body 101 through threads. The seal 105 can ensure that there is no oil leakage between the spring connection seat 103 and the valve body 101. The spring fixing nut seat 103 and the valve body 101 can also be connected by other forms other than threaded connection, such as welding.

[0077] Working principle details:

[0078] The damping adjustment signal input of the hydraulic interconnected suspension system uses the vehicle's existing sensors to transmit the vehicle's driving conditions, such as speed, start-stop, acceleration, steering, braking and other signals to the central processor. The central processor conducts a comprehensive analysis and outputs a control signal to the actuator of the adjustable damping valve device to adjust the damping force value.

[0079] Automobile driving conditions can be roughly divided into three conditions according to the adjustment requirements of the damping valve: general conditions, high-speed and small bump conditions, and turning conditions. The damping force value corresponding to the general conditions requires that the compression damping and the extension damping are within a certain range; the damping force value corresponding to the bump condition requires that the vibration can be absorbed quickly, and the compression damping should be relatively small; the damping force value corresponding to the turning condition requires that the extension damping and the compression damping are relatively large.

[0080] The operating condition signals are collected through the vehicle body acceleration sensor, wheel acceleration sensor, vehicle body height sensor, etc., and then sent to the central processing unit. The central processing unit processes and analyzes the signals, and issues execution instructions to the actuator.

[0081] The adjustable damping valve is realized by connecting a flow control valve in series on the basis of the fixed flow damping valve of the existing hydraulic interconnected suspension system. There are multiple groups of throttle holes with different apertures inside the flow control valve. The throttle holes are selected by moving the sliding column, so that different throttle holes of the flow control valve are connected in series with the fixed valve in different gears to realize the step-by-step adjustment of the damping of the hydraulic interconnected suspension system.

[0082] There are many ways to achieve the movement of the sliding column, such as solenoid valve drive, motor drive or manual adjustment. According to the design requirements, different adjustment methods can be selected based on cost, structure and other considerations. For example, during the functional test phase of the flow control valve, the sliding column can be manually adjusted to move to different gears to achieve aperture selection, thereby achieving step-by-step adjustment of the damping. If there are no high requirements for the speed of adjustment and you want to achieve automatic adjustment, you can consider using a motor to drive the screw to move the sliding column. Compared with the motor solution, the solenoid valve solution is more responsive, more compact, and has an acceptable cost on the basis of achieving automatic adjustment.

[0083] In this case, solenoid valve drive is the preferred solution. The sliding column and the solenoid valve are made into one body, and by controlling the current passing through the solenoid valve, the magnetic field inside the solenoid valve generates different magnetic forces, thereby controlling the movement of the sliding column. One end of the sliding column is connected to the solenoid valve, and the other end is matched with the flow control valve, and the center position is positioned by the reset elastic element. When the solenoid valve fails or the current is disconnected, the elastic element can ensure that the sliding column is located in the middle position of the flow control valve and the system can provide basic compression and tension damping force values. The gap between the sliding column and the flow control valve is small, and the flow loss can be ignored. The sliding column achieves smooth sliding through the oil film.

[0084] There are one or more through holes on the sliding column, and the through hole diameters are the same or different. During the movement of the sliding column, it corresponds to different flow holes inside the flow control valve. Depending on the size of the hole diameter, the through hole of the sliding column participates in or does not participate in the flow control of the flow control valve. After different sliding column through holes are connected with different flow control valve through holes, the system flow can be controlled in stages, and finally the damping can be adjusted in multiple stages.

[0085] The vehicle hydraulic interconnected suspension system and the adjustable damping valve of the present invention are reasonably designed. By changing the form of the damping valve, the system flow rate can be controlled in stages, and finally the damping can be adjusted in real time according to the movement state of the whole vehicle, so that the damping characteristics of the hydraulic interconnected suspension system can adapt to the movement state of the whole vehicle and achieve the best comfort state.

[0086] The above is only an explanation of the preferred embodiments of the present invention, and the above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0087] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An adjustable damping valve, comprising a valve body, the valve body being provided with two oil ports for connecting an oil circuit, characterized in that: It also includes a slide column and a return spring for returning the slide column and a driving structure for driving the slide column to move, wherein the slide column is movably arranged in the valve body, and a group of throttle holes with different apertures for connecting two oil ports are arranged on the valve body and the slide column; The valve body is provided with a sliding hole, the sliding column is movably arranged in the sliding hole, and both ends of the valve body are provided with sealing members for preventing oil in the valve body from leaking out; The valve body is provided with two groups of flow holes, and the two groups of flow holes are respectively connected with corresponding oil ports; each group of flow holes includes two or more flow holes with different apertures arranged side by side, and the sliding column is provided with a through hole for connecting the two groups of flow holes; the two groups of flow holes are arranged opposite to each other, and the aperture of the through hole on the sliding column is larger than the aperture of the flow hole; the sliding column is provided with one or more flow holes with different apertures, and one oil port of the valve body is arranged corresponding to one end of the connecting flow hole, and the other oil port of the valve body is arranged corresponding to the other end of the connecting flow hole.

2. The adjustable damping valve according to claim 1, characterized in that: A spring fixing seat is provided at one end of the valve body, one end of the return spring is connected to the spring fixing seat, the other end of the return spring is connected to one end of the sliding column, and the driving structure is arranged corresponding to the other end of the sliding column.

3. The adjustable damping valve according to claim 2, characterized in that: The spring fixing seat is provided with a groove, and one end of the return spring is arranged in the groove; the other end of the return spring is sleeved on one end of the sliding column or one end of the sliding column is provided with a recessed groove, and the other end of the return spring is arranged in the recessed groove.

4. A vehicle hydraulic interconnected suspension system, comprising a front left hydraulic cylinder, a front right hydraulic cylinder, a rear left hydraulic cylinder and a rear right hydraulic cylinder of the suspension, characterized in that: The rod chamber of the front left hydraulic cylinder, the rodless chamber of the front right hydraulic cylinder, the rod chamber of the rear left hydraulic cylinder and the rodless chamber of the rear right hydraulic cylinder are connected to form a hydraulic circuit a; The rodless chamber of the front left hydraulic cylinder, the rod chamber of the front right hydraulic cylinder, the rodless chamber of the rear left hydraulic cylinder and the rod chamber of the rear right hydraulic cylinder are connected to form a hydraulic circuit b; The hydraulic circuit a and the hydraulic circuit b are both provided with an adjustable damping valve as claimed in any one of claims 1 to 3; and the corresponding hydraulic circuit a and the hydraulic circuit b are both connected with an accumulator; The accumulator comprises an accumulator a and an accumulator b, a damping valve a in front of the accumulator is provided between the hydraulic circuit a and the accumulator a, and a damping valve b in front of the accumulator is provided between the hydraulic circuit b and the accumulator b; A balancing valve is provided between the hydraulic circuit a and the hydraulic circuit b.

5. The vehicle hydraulic interconnected suspension system as claimed in claim 4, characterized in that: A fixed flow damping valve is provided in the hydraulic circuit a and / or the hydraulic circuit b, and the corresponding fixed flow damping valve and the adjustable damping valve are arranged in series or in parallel.

6. The vehicle hydraulic interconnected suspension system as claimed in claim 5, characterized in that: The vehicle is provided with a vehicle condition sensor and a central processing unit. The vehicle collects working condition signals through the vehicle condition sensor and then transmits the signals to the central processing unit. The central processing unit processes and analyzes the signals and issues execution instructions to the adjustable damping valve. The adjustable damping valve changes the flow rate connected to the hydraulic interconnected suspension system to achieve flow graded control. Finally, the hydraulic interconnected suspension system provides different damping force values ​​to the vehicle according to the working conditions.

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