CN111301084A - Hydro-pneumatic suspension system, vehicle and control method of hydro-pneumatic suspension system - Google Patents
Hydro-pneumatic suspension system, vehicle and control method of hydro-pneumatic suspension system Download PDFInfo
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- CN111301084A CN111301084A CN201911111507.3A CN201911111507A CN111301084A CN 111301084 A CN111301084 A CN 111301084A CN 201911111507 A CN201911111507 A CN 201911111507A CN 111301084 A CN111301084 A CN 111301084A
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- 239000000725 suspension Substances 0.000 title claims abstract description 235
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 230000001276 controlling effect Effects 0.000 claims description 13
- 238000013016 damping Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 abstract description 9
- 239000003921 oil Substances 0.000 description 177
- 239000010720 hydraulic oil Substances 0.000 description 5
- 230000036544 posture Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002370 liquid polymer infiltration Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
- B60G11/26—Resilient suspensions characterised by arrangement, location or kind of springs having fluid springs only, e.g. hydropneumatic springs
- B60G11/27—Resilient suspensions characterised by arrangement, location or kind of springs having fluid springs only, e.g. hydropneumatic springs wherein the fluid is a gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
- B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
- B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
- B60G17/0408—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics details, e.g. antifreeze for suspension fluid, pumps, retarding means per se
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
- B60G21/06—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected fluid
- B60G21/067—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected fluid between wheels on different axles on the same side of the vehicle, i.e. the left or the right side
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
- B60G21/06—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected fluid
- B60G21/073—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected fluid between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The invention discloses a hydro-pneumatic suspension system, a vehicle and a control method of the hydro-pneumatic suspension system, wherein the hydro-pneumatic suspension system comprises a hydraulic pump and at least two suspension oil cylinder groups; the hydraulic pump is connected with the axle pressure oil circuit and the axle oil return circuit; each suspension oil cylinder group comprises a left suspension oil cylinder arranged on the left side of the corresponding axle and a right suspension oil cylinder arranged on the right side of the corresponding axle; the left suspension oil cylinder and the right suspension oil cylinder are respectively provided with a respective suspension control valve group; the suspension control valve group comprises: the switching control valve block can switch and connect the rod cavity of the corresponding suspension oil cylinder with the axle pressure oil circuit and the axle oil return circuit, and the switch valve block can connect and disconnect the rodless cavity of the corresponding suspension oil cylinder with the rod cavity of the other suspension oil cylinder in the same group. The invention can quickly realize independent control of the suspension oil cylinders, synchronous control of the coaxial suspension oil cylinders, synchronous control of the same-side suspension oil cylinders and lifting adjustment of the whole vehicle, and can meet the requirements of various running states.
Description
Technical Field
The invention relates to an hydro-pneumatic suspension system, a vehicle and a control method of the hydro-pneumatic suspension system, and belongs to the technical field of vehicle suspensions.
Background
The hydro-pneumatic suspension has the advantages of height adjustability, rigidity support, anti-roll performance, good shock absorption performance and nonlinear characteristics of rigidity and damping. The vehicle adopting the hydro-pneumatic suspension has the advantages of driving comfort, strong stability, trafficability and off-road property, and can drive on severe working conditions such as deserts, marshes and the like and rugged inclined roads, so that the hydro-pneumatic suspension is widely applied to special vehicles such as cranes, tanks and armored cars. At present, a multi-axle vehicle adopting an oil-gas suspension system needs to adjust suspension postures under different road conditions so as to improve the passing performance of the vehicle. The existing hydro-pneumatic suspension system is not designed with synchronous control, so that the suspension posture can not be adjusted in place quickly when being adjusted, and the running performance of a vehicle is seriously influenced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an oil-gas suspension system, a vehicle and a control method of the oil-gas suspension system, which can realize the lifting of a single suspension oil cylinder and the synchronous posture adjustment of multiple suspension oil cylinders.
To achieve the above object, a first aspect of the present invention provides a hydro-pneumatic suspension system, comprising a hydraulic pump and at least two suspension cylinder sets;
the hydraulic pump is connected with the axle pressure oil path and the axle oil return path; each suspension oil cylinder group comprises a left suspension oil cylinder arranged on the left side of the corresponding axle and a right suspension oil cylinder arranged on the right side of the corresponding axle;
the left suspension oil cylinder and the right suspension oil cylinder are respectively provided with a respective suspension control valve group;
the hanging control valve group comprises: the switching control valve block can switch and connect the rod cavity of the corresponding suspension oil cylinder with the axle pressure oil circuit and the axle oil return circuit, and the switch valve block can connect and disconnect the rodless cavity of the corresponding suspension oil cylinder with the rod cavity of the other suspension oil cylinder in the same group.
With reference to the first aspect, optionally, the switching control valve block includes a three-position four-way valve, a speed control valve, a first check valve, a second check valve, a third check valve and a fourth check valve, an oil inlet of the first check valve and an oil outlet of the second check valve are respectively connected to a first oil port of the three-position four-way valve, an oil inlet of the third check valve and an oil outlet of the fourth check valve are respectively connected to a rod cavity of the suspension cylinder, a rodless cavity of the suspension cylinder is connected to a second oil port of the three-position four-way valve, a third oil port of the three-position four-way valve is connected to an axle pressure oil line, and a fourth oil port is connected to an axle return oil line;
when oil is fed into the rod cavity of the suspension oil cylinder, liquid flows from the axle pressure oil path to the rod cavity of the suspension oil cylinder through the third oil port, the first check valve, the speed regulating valve and the fourth check valve of the three-position four-way valve, so that the retraction action of the suspension oil cylinder is realized;
when the rod cavity of the suspension oil cylinder returns oil, the liquid flows to the axle oil return path through the third one-way valve, the speed regulating valve, the second one-way valve, the first oil port and the fourth oil port of the three-position four-way valve, and the extension action of the suspension oil cylinder is realized.
With reference to the first aspect, optionally, the three-position four-way valve is a mid-position function 0 type three-position four-way valve.
With reference to the first aspect, optionally, the switching valve block includes a first switching valve connected to the rodless cavity of the suspension cylinder and a second switching valve connected to the rod cavity of another suspension cylinder in the same suspension cylinder group, and the first switching valve and the second switching valve are respectively connected to the accumulator.
With reference to the first aspect, optionally, an oil port of the energy accumulator is connected to an adjustable damping valve or an electric proportional switch valve.
With reference to the first aspect, optionally, the first switch valve and/or the second switch valve is a two-position two-way cone valve.
In combination with the first aspect, optionally, the axle pressure oil path is further connected to a hydraulic oil tank through a directional valve, when the suspension system is completely rigidly locked, the directional valve is not powered, and if a motor of the hydraulic pump is started, all oil flows back to the hydraulic oil tank.
In combination with the first aspect, optionally, the hydraulic pump and the axle pressure oil path connection oil port is further connected with a fifth check valve for preventing oil from flowing back, and an oil inlet of the fifth check valve is connected with an overflow valve.
A second aspect of the present invention provides a vehicle including the hydro-pneumatic suspension system of any one of the first aspects of the present invention.
A third aspect of the present invention provides a method of controlling the hydro-pneumatic suspension system of any one of the first aspect of the present invention, comprising any one or more of the following control methods:
synchronously controlling each switch valve block to enable the hydro-pneumatic suspension system to enter a roll-preventing state and a suspension elastic state;
independently controlling a suspension control valve group of a target suspension oil cylinder to enable the target suspension oil cylinder to independently extend and retract;
the oil-gas suspension system enters a coaxial adjusting state by synchronously controlling two suspension control valve groups of the same axle;
synchronously controlling the suspension control valve groups on the same side of each axle to enable the oil-gas suspension system to enter a same-side regulation state;
and synchronously controlling all the suspension control valve groups to enable the oil-gas suspension system to enter a finished automobile lifting regulation state.
Compared with the prior art, the hydro-pneumatic suspension system, the vehicle and the control method of the hydro-pneumatic suspension system provided by the invention have the beneficial effects that:
for each suspension cylinder configuration corresponding suspension control valves, the suspension control valves include: the control device comprises a switching control valve block which can switch and connect a rod cavity of a corresponding suspension oil cylinder with an axle pressure oil circuit and an axle return oil circuit, and a switch valve block which can connect and disconnect a rodless cavity of the corresponding suspension oil cylinder with a rod cavity of another suspension oil cylinder in the same group.
Drawings
FIG. 1 is a schematic structural view of a hydro-pneumatic suspension system according to an embodiment of the present invention;
in the figure: 1. a left suspension oil cylinder of the bridge; 2. 3, 6, 7, hanging a control valve group; 2-0, 3-0, 6-0, 7-0, adjustable damping valve or electric proportional switch valve; 2-1, a first one-way valve; 2-2, a second one-way valve; 2-3, a fourth one-way valve; 2-4, a speed regulating valve; 2-5, a third one-way valve; 4. a bridge right suspension oil cylinder; 5. a second bridge right suspension oil cylinder; 8. a two-axle left suspension oil cylinder; 9. a hydraulic oil tank; 10. a gear pump; 11. a motor; 12. a directional valve; 13. a fifth check valve; 14. an overflow valve; l isPThe axle pressure oil way; l isTAnd an axle oil return path.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, an embodiment of the present invention provides an hydro-pneumatic suspension system, including:
a hydraulic pump: the P port and the axle pressure oil path LPConnecting, T-port and axle oil return path LTConnecting;
at least two suspension cylinder groups: each suspension oil cylinder group is arranged corresponding to one axle of the vehicle and comprises a left suspension oil cylinder arranged on the left side of the corresponding axle and a right suspension oil cylinder arranged on the right side of the corresponding axle;
the left suspension oil cylinder and the right suspension oil cylinder are respectively provided with respective suspension control valve groups 2, 3, 6 and 7;
each suspension control valve group 2, 3, 6 and 7 comprises a rod cavity capable of corresponding suspension oil cylinder and an axle pressure oil path LPAxle oil return path LTThe switching control valve block is used for switching connection, and the switch valve block can connect and disconnect a rodless cavity of the corresponding suspension oil cylinder with a rod cavity of another suspension oil cylinder in the same group.
According to the hydro-pneumatic suspension system provided by the embodiment of the invention, the switching control valve block and the switching valve block are controlled, so that not only can the extension and retraction control of a single suspension oil cylinder be realized, but also the synchronous extension and retraction control of every two suspension oil cylinders and the synchronous extension and retraction control of all suspension oil cylinders can be realized.
As shown in fig. 1, the hydro-pneumatic suspension system provided by the embodiment of the invention comprises two suspension cylinder groups, including a one-bridge left suspension cylinder 1, a one-bridge right suspension cylinder 4, a two-bridge left suspension cylinder 8 and a two-bridge right suspension cylinder 5, wherein each suspension cylinder is correspondingly provided with one suspension control valve group 2, 3, 6 and 7. It should be understood that the number of the suspension cylinder groups is not limited to two, and may be set in one group according to the number of axles of the vehicle.
The hydraulic pump in the embodiment of the present invention includes a gear pump 10 and a motor 11 driving the gear pump 10. The suspension control valve groups 2, 3, 6 and 7 have the same structure, and the specifications of the adopted valve blocks are also the same. The suspension control valve group 2 connected to the left suspension cylinder 1 of the bridge is taken as an example, and the suspension control valve groups 2, 3, 6, and 7 are further described in detail below.
As shown in fig. 1, the suspension control valve group 2 includes a switching control valve block and a switching valve block.
The switching control valve block comprises a three-position four-way valve, a speed regulating valve 2-4, a first one-way valve 2-1, a second one-way valve 2-2, a third one-way valve 2-5 and a fourth one-way valve 2-3. In the embodiment of the invention, the three-position four-way valve adopts a 0-type three-position four-way valve with a middle position function and is provided with a first oil port, a second oil port, a third oil port and a fourth oil port, and the three-position four-way valve is switched by electrifying to realize switching conduction of the first oil port and the second oil port with the third oil port and the fourth oil port. An oil inlet of the first check valve 2-1 and an oil outlet of the second check valve 2-2 are respectively connected with a first oil port of the three-position four-way valve, an oil inlet of the third check valve 2-5 and an oil outlet of the fourth check valve 2-3 are respectively connected with a rod cavity of the left suspension oil cylinder 1 of the bridge, a rodless cavity of the left suspension oil cylinder 1 of the bridge is connected with a second oil port of the three-position four-way valve, and a third oil port of the three-position four-way valve is connected with an axle pressure oil path LPIs connected with a fourth oil port and an axle oil return path LTAnd (4) connecting.
When the rod cavity of the left suspension oil cylinder 1 of the bridge is filled with oil, liquid flowsPressure oil line L of slave axlePThe oil flows through a third oil port, a first one-way valve 2-1, a speed regulating valve 2-4 and a fourth one-way valve 2-3 of the three-position four-way valve to a rod cavity of the left bridge suspension oil cylinder 1, so that the retraction action of the left bridge suspension oil cylinder 1 is realized;
when the rod cavity of the left suspension oil cylinder 1 of the axle returns oil, the liquid flows through the third one-way valve 2-5, the speed regulating valve 2-4, the second one-way valve 2-2, the first oil port and the fourth oil port of the three-position four-way valve to the axle oil return path LTAnd the extension action of the left suspension oil cylinder 1 of the bridge is realized.
The speed regulating valves 2-4 are composed of a constant-differential pressure reducing valve and a throttle valve, the constant-differential pressure reducing valve can automatically compensate the influence of load change, and the front and rear pressure difference is a constant value; the flow area of each speed regulating valve can be equal by adjusting the opening of the throttle valve in each speed regulating valve, and the flow passing through each speed regulating valve is equal and does not change along with the change of the load, so that the synchronous action of each suspension oil cylinder is ensured. When oil is fed into a rod cavity of the suspension oil cylinder, the speed regulating valve is used for throttling and regulating the speed of the fed oil; during oil return, the speed regulating valve is used for oil return throttling speed regulation, and oil flows through the speed regulating valve in one direction all the time.
The switch valve block comprises a first switch valve Y113 connected with a rodless cavity of the left suspension oil cylinder 1 of one bridge and a second switch valve Y114 connected with a rod cavity of another suspension oil cylinder (namely the right suspension oil cylinder 4 of one bridge) in the same suspension oil cylinder group, and the first switch valve Y113 and the second switch valve Y114 are respectively connected with the energy accumulator. In the embodiment of the invention, the oil port of the energy accumulator is also connected with a manual adjustable damping valve 2-0 which is used for adjusting the damping and rigidity of the oil-gas suspension system, so that the suspension system is suitable for different road conditions.
In the embodiment of the invention, the first switch valve Y113 and the second switch valve Y114 adopt two-position two-way cone valves, the leakage inside the valve body is extremely small, and the complete rigid locking of the whole vehicle suspension system can be effectively realized.
Axle pressure oil path LPThe hydraulic oil tank 9 and the suspension system are also connected through a directional valve 12When the hydraulic pump is completely and rigidly locked, the directional valve 12 is not electrified, and if the motor 11 of the hydraulic pump is started, all the oil flows back to the hydraulic oil tank 9.
The hydraulic pump and axle pressure oil path LPThe connecting oil port P is also connected with a fifth one-way valve 13 for preventing oil from flowing back, and an oil inlet of the fifth one-way valve 13 is connected with an overflow valve 14.
The vehicle provided by the embodiment of the invention comprises the hydro-pneumatic suspension system, the number of the suspension oil cylinder groups is not limited to two, one group can be arranged according to the number of axles of the vehicle, and correspondingly, the number of the suspension oil cylinder control valve groups is not limited to four, and one suspension oil cylinder group is arranged corresponding to each suspension oil cylinder.
With respect to the hydro-pneumatic suspension system provided in fig. 1, the control method of the hydro-pneumatic suspension system under different operating conditions will be further described in detail.
When no suspension adjustment is required, the directional valve 12Y0 is de-energized by default and the gear pump 1010 is unloaded.
Anti-roll scheme: the rod cavity of the left suspension oil cylinder is communicated with the rod cavity of the right suspension oil cylinder, and the rod cavity of the left suspension oil cylinder is communicated with the rod cavity of the right suspension oil cylinder and communicated with the energy accumulator to realize anti-roll control. Specifically, the switch valves Y113 and Y114 in the suspension control valve group 2 are powered, the switch valves Y123 and Y124 in the suspension control valve group 3 are powered, the switch valves Y223 and Y224 in the suspension control valve group 6 are powered, the switch valves Y213 and Y214 in the suspension control valve group 7 are powered, and other valve cores are not powered, and at the moment, rod cavities and rodless cavities of the left and right suspension oil cylinders are crossed and communicated and are communicated with the energy accumulator, so that the anti-roll purpose is achieved.
Suspension rigidity scheme: all the switch valves in the suspension control valve groups 2, 3, 6 and 7 are not powered, the rodless cavity and the rod cavity oil circuit of the suspension oil cylinder are not communicated at the moment, the energy accumulator and any cavity of the suspension oil cylinder are not communicated, the switch valves all adopt two-position two-way cone valves, the leakage inside the valve body is extremely small, and the complete rigid locking of the whole vehicle suspension system can be effectively realized. The directional valve Y0 is not energized, and if the motor 11 is activated, all of the oil flows back to the hydraulic tank 9.
Suspension elasticity scheme: the scheme is consistent with the control method in the anti-roll scheme, and is not described again.
The single oil cylinder adjusting scheme comprises the following steps: including both retraction and extension. Taking the left suspension cylinder 1 of the bridge as an example, the retracting action is as follows: when the motor 11 is started, the direction valve 12Y0 is electrified, Y112 and Y113 in the suspension control valve group 2 are electrified, Y114 is not electrified, oil is fed into a rod cavity and returned into a rodless cavity of the left suspension oil cylinder 1 of one bridge at the moment, and the left suspension oil cylinder 1 of one bridge realizes retraction; the elongation action is as follows: when the motor 11 is started, the direction valve Y0 is electrified, Y111 and Y113 in the suspension control valve group 2 are electrified, Y114 is not electrified, at the moment, oil is fed into a rodless cavity and returned into a rod cavity of the left suspension oil cylinder 1 of the bridge, and the left suspension oil cylinder 1 of the bridge realizes the extension action.
The coaxial adjusting scheme is as follows: taking a bridge suspension oil cylinder group as an example, a motor 11 is started, a direction valve Y0 is electrified, Y111, Y113, Y121 and Y123 in suspension control valve groups 2 and 3 are electrified, at the moment, a bridge left suspension oil cylinder 1 and a bridge right suspension oil cylinder 4 have no rod cavity for oil feeding and rod cavity for oil returning, and the bridge suspension oil cylinder realizes the extension action; the motor 11 is started, the directional valve 12Y0 is electrified, Y112, Y113, Y122 and Y123 in the suspension control valve groups 2 and 3 are electrified, at the moment, the rod cavities of the left suspension oil cylinder 1 and the right suspension oil cylinder 4 of the bridge are filled with oil, and the rodless cavities are filled with oil, and the suspension oil cylinder group of the bridge realizes retraction.
The same-side regulation scheme comprises the following steps: taking the left suspension oil cylinder group as an example, the motor 11 is started, the directional valve Y0 is electrified, Y111, Y113, Y211 and Y213 in the suspension control valve groups 2 and 7 are electrified, at the moment, the rodless cavities of the first-bridge left suspension oil cylinder 1 and the second-bridge left suspension oil cylinder 8 are fed with oil and the rod cavities are fed with oil, and the left suspension oil cylinder realizes the extension action; when the motor 11 is started, the directional valve Y0 is electrified, Y112, Y113, Y212 and Y213 in the suspension control valve groups 2 and 7 are electrified, the rod cavities of the first-bridge left suspension oil cylinder 1 and the second-bridge left suspension oil cylinder 8 are used for oil inlet and rodless cavity oil return, and the left suspension oil cylinder group realizes retraction.
Lifting adjustment of the whole vehicle: when the motor 11 is started, the directional valve Y0 is electrified, Y112, Y113, Y122, Y123, Y212, Y213, Y222 and Y223 in the suspension control valve groups 2, 3, 6 and 7 are electrified, oil is fed into the rod cavities of the four suspension oil cylinders at the moment, oil is fed into the rodless cavities of the four suspension oil cylinders, and the whole vehicle suspension oil cylinder realizes retraction action; the motor 11 is started, the directional valve Y0 is electrified, Y111, Y113, Y121, Y123, Y211, Y213, Y221 and Y223 in the suspension control valve groups 2, 3, 6 and 7 are electrified, at the moment, oil is fed into the rodless cavities of the four suspension oil cylinders and oil is fed back into the rod cavities, and the suspension oil cylinders of the whole vehicle realize extension action.
Therefore, the hydro-pneumatic suspension system, the vehicle and the control method of the hydro-pneumatic suspension system provided by the embodiment of the invention can quickly realize independent control of the suspension oil cylinders, synchronous control of the coaxial suspension oil cylinders, synchronous control of the same-side suspension oil cylinders and lifting adjustment of the whole vehicle, and can meet various driving state requirements; the speed regulation valve can realize the adjustment of the speed and the synchronization of the action of the suspension oil cylinder; the damping and the rigidity of the hydro-pneumatic suspension system are adjustable, and the suspension rigidity and the damping can be adjusted according to different road conditions.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A hydro-pneumatic suspension system is characterized by comprising a hydraulic pump and at least two suspension oil cylinder groups;
the hydraulic pump is connected with the axle pressure oil path and the axle oil return path; each suspension oil cylinder group comprises a left suspension oil cylinder arranged on the left side of the corresponding axle and a right suspension oil cylinder arranged on the right side of the corresponding axle;
the left suspension oil cylinder and the right suspension oil cylinder are respectively provided with a respective suspension control valve group;
the hanging control valve group comprises: the switching control valve block can switch and connect the rod cavity of the corresponding suspension oil cylinder with the axle pressure oil circuit and the axle oil return circuit, and the switch valve block can connect and disconnect the rodless cavity of the corresponding suspension oil cylinder with the rod cavity of the other suspension oil cylinder in the same group.
2. The hydro-pneumatic suspension system of claim 1, wherein the switching control valve block includes a three-position four-way valve, a speed regulating valve, a first check valve, a second check valve, a third check valve and a fourth check valve, an oil inlet of the first check valve and an oil outlet of the second check valve are respectively connected with a first oil port of the three-position four-way valve, an oil inlet of the third check valve and an oil outlet of the fourth check valve are respectively connected with a rod cavity of the suspension cylinder, a rodless cavity of the suspension cylinder is connected with a second oil port of the three-position four-way valve, a third oil port of the three-position four-way valve is connected with an axle pressure oil path, and a fourth oil port is connected with an axle return oil path;
when oil is fed into the rod cavity of the suspension oil cylinder, liquid flows from the axle pressure oil path to the rod cavity of the suspension oil cylinder through the third oil port, the first check valve, the speed regulating valve and the fourth check valve of the three-position four-way valve, so that the retraction action of the suspension oil cylinder is realized;
when the rod cavity of the suspension oil cylinder returns oil, the liquid flows to the axle oil return path through the third one-way valve, the speed regulating valve, the second one-way valve, the first oil port and the fourth oil port of the three-position four-way valve, and the extension action of the suspension oil cylinder is realized.
3. The hydro-pneumatic suspension system of claim 2, wherein the three-position four-way valve is a mid function type 0 three-position four-way valve.
4. The hydro-pneumatic suspension system of any one of claims 1 to 3, wherein the switch valve block comprises a first switch valve connected to the rodless chamber of the suspension cylinder and a second switch valve connected to the rod chamber of another suspension cylinder in the same suspension cylinder group, the first switch valve and the second switch valve being connected to the accumulator, respectively.
5. The hydro-pneumatic suspension system of claim 4, wherein an adjustable damping valve or an electro-proportional on-off valve is connected to an oil port of the accumulator.
6. The hydro-pneumatic suspension system of claim 4, wherein the first and/or second on-off valve is a two-position two-way cone valve.
7. The hydro-pneumatic suspension system of claim 1, wherein the axle pressure oil path is further connected to a hydraulic tank through a directional valve, the directional valve being de-energized when the suspension system is fully latched rigid, and the oil flowing back to the hydraulic tank when the motor of the hydraulic pump is activated.
8. The hydro-pneumatic suspension system as defined in claim 1, wherein a fifth check valve for preventing oil from flowing back is further connected to an oil port of the hydraulic pump connected to the axle pressure oil path, and an overflow valve is connected to an oil inlet of the fifth check valve.
9. A vehicle comprising the hydro-pneumatic suspension system of any one of claims 1 to 8.
10. A method of controlling a hydro-pneumatic suspension system as claimed in any one of claims 1 to 8, comprising any one or more of the following methods of controlling:
synchronously controlling each switch valve block to enable the hydro-pneumatic suspension system to enter a roll-preventing state and a suspension elastic state;
independently controlling a suspension control valve group of a target suspension oil cylinder to enable the target suspension oil cylinder to independently extend and retract;
the oil-gas suspension system enters a coaxial adjusting state by synchronously controlling two suspension control valve groups of the same axle;
synchronously controlling the suspension control valve groups on the same side of each axle to enable the oil-gas suspension system to enter a same-side regulation state;
and synchronously controlling all the suspension control valve groups to enable the oil-gas suspension system to enter a finished automobile lifting regulation state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911111507.3A CN111301084A (en) | 2019-11-14 | 2019-11-14 | Hydro-pneumatic suspension system, vehicle and control method of hydro-pneumatic suspension system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911111507.3A CN111301084A (en) | 2019-11-14 | 2019-11-14 | Hydro-pneumatic suspension system, vehicle and control method of hydro-pneumatic suspension system |
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Cited By (5)
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| CN111927837A (en) * | 2020-07-24 | 2020-11-13 | 泰安航天特种车有限公司 | Hydro-pneumatic suspension lifting hydraulic system and lifting method |
| CN112009193A (en) * | 2020-09-11 | 2020-12-01 | 泰安航天特种车有限公司 | Anti adjustable oil gas suspension hydraulic system that heels |
| CN112623026A (en) * | 2020-12-30 | 2021-04-09 | 徐州徐工挖掘机械有限公司 | Steering and suspension adjusting composite system and engineering vehicle |
| CN112895831A (en) * | 2021-01-29 | 2021-06-04 | 中国北方车辆研究所 | Multi-axle vehicle posture adjusting system |
| CN115342091A (en) * | 2021-05-12 | 2022-11-15 | 哈威油液压技术(无锡)有限公司 | Hydraulic control system |
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| CN112623026A (en) * | 2020-12-30 | 2021-04-09 | 徐州徐工挖掘机械有限公司 | Steering and suspension adjusting composite system and engineering vehicle |
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| CN115342091A (en) * | 2021-05-12 | 2022-11-15 | 哈威油液压技术(无锡)有限公司 | Hydraulic control system |
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