CN111301085A - 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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- CN111301085A CN111301085A CN201911111509.2A CN201911111509A CN111301085A CN 111301085 A CN111301085 A CN 111301085A CN 201911111509 A CN201911111509 A CN 201911111509A CN 111301085 A CN111301085 A CN 111301085A
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- 239000000725 suspension Substances 0.000 title claims abstract description 247
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000001360 synchronised effect Effects 0.000 claims abstract description 14
- 238000013016 damping Methods 0.000 claims description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 191
- 239000010720 hydraulic oil Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000036544 posture Effects 0.000 description 1
- 230000001681 protective effect 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 an oil-gas suspension system, a vehicle and a control method of the oil-gas suspension system, wherein the system comprises a hydraulic pump, at least two suspension oil cylinder groups, a suspension control valve group and a flow dividing valve group, wherein each suspension oil cylinder group corresponds to an axle and comprises a left suspension oil cylinder and a right suspension oil cylinder; the suspension control valve group 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 oil return 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; the flow dividing valve group is connected between the suspension control valve group and the hydraulic pump, can equally divide the flow of oil from the axle pressure oil circuit according to the number of the suspension oil cylinders, and is matched with the control of each suspension control valve group to realize the independent lifting adjustment and the synchronous lifting adjustment of each suspension oil cylinder. The invention can realize synchronous extension and retraction of each suspension oil cylinder, and is beneficial to improving the running performance of the vehicle.
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 has few synchronous control designs, and even if the existing hydro-pneumatic suspension system has a synchronous design, various defects that pairwise synchronization cannot be realized or active lifting cannot be realized exist, and the driving 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 synchronous extension and retraction of each suspension oil cylinder and are beneficial to improving the running performance of the vehicle.
A first aspect of the present invention provides an hydro-pneumatic suspension system comprising:
a hydraulic pump: connecting an axle pressure oil path and an axle oil return path;
at least two suspension cylinder groups: each suspension oil cylinder group corresponds to one axle 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;
hanging a control valve group: each suspension oil cylinder is provided with a group corresponding to each suspension oil cylinder, and each group comprises a switching control valve block which can switch and connect a rod cavity of the corresponding suspension oil cylinder with an axle pressure oil circuit and an axle oil return 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;
a flow dividing valve group: the hydraulic control system is connected between the suspension control valve group and the hydraulic pump, can equally divide the flow of oil from the axle pressure oil circuit according to the number of the suspension oil cylinders, and is matched with the control of each suspension control valve group to realize independent lifting adjustment and synchronous lifting adjustment of each suspension oil cylinder.
With reference to the first aspect, an optional embodiment is that the switching control valve block includes a three-position four-way valve, a first switch valve and a second switch valve, a first oil port of the three-position four-way valve is connected to a rod cavity of a corresponding suspension cylinder through the first switch valve, a second oil port is connected to a rodless cavity of a corresponding suspension cylinder through the second switch valve, a third oil port is connected to a corresponding oil outlet of the flow dividing valve group, and a fourth oil port is connected to an axle return oil path; and the three-position four-way valve is electrified and reversed, so that the first oil port and the second oil port are switched and conducted with the third oil port and the fourth oil port respectively, and the extension and retraction actions of the suspension oil cylinder are realized.
With reference to the first aspect, in an alternative embodiment, the switching valve block includes a first switching valve connected to the rodless chamber of the suspension cylinder and a second switching valve connected to the rod chamber 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, in an optional embodiment, an oil port of the accumulator is connected to an adjustable damping valve or an electric proportional switch valve.
With reference to the first aspect, in an alternative embodiment, the flow dividing valve assembly includes a third on/off valve connected between the suspension cylinder control valve and the axle oil return path; when the suspension oil cylinder does not need to act, the third switch valve corresponding to the suspension oil cylinder is opened, and oil flowing out of the flow dividing valve group flows back to the axle oil return circuit through the third switch valve.
With reference to the first aspect, in an alternative embodiment, the flow dividing valve block includes a plurality of cascaded flow dividing valves, and the oil from the axle pressure oil line is divided by the flow dividing valves in stages and flows to the suspension control valve blocks.
With reference to the first aspect, in an alternative embodiment, the axle pressure oil path is further connected to a hydraulic oil tank through a directional valve, when the suspension system is completely and rigidly locked, the directional valve is not powered, and if a motor of the hydraulic pump is started, oil completely flows back to the hydraulic oil tank.
In combination with the first aspect, in an optional embodiment, the hydraulic pump is further connected with a check valve for preventing oil from flowing back, and an oil inlet of the check valve is connected with an overflow valve.
A second aspect of the present invention provides a vehicle comprising a hydro-pneumatic suspension system according to 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 aspects 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;
independent control is carried out on corresponding branches in a suspension control valve group and a shunt valve group of a target suspension oil cylinder so as to enable the target suspension oil cylinder to realize independent extension and independent retraction;
the oil-gas suspension system enters a coaxial adjusting state by synchronously controlling corresponding branches in two suspension control valve sets and a shunt valve set of the same axle;
synchronously controlling corresponding branches in the suspension control valve group and the shunt valve group on the same side of each axle so as to enable the oil-gas suspension system to enter a same-side regulation state;
the oil-gas suspension system enters a whole vehicle lifting regulation state by synchronously controlling all suspension control valve groups and corresponding branches in the shunt valve group.
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:
the suspension control valve group can be used for switching and connecting a rod cavity of a corresponding suspension oil cylinder with an axle pressure oil circuit and an axle oil return circuit, and communicating a rodless cavity of the corresponding suspension oil cylinder with a rod cavity of another suspension oil cylinder in the same group; the flow distribution valve group can equally distribute the flow of oil from the axle pressure oil circuit according to the number of the suspension oil cylinders, and is matched with the control of each suspension control valve group to realize independent lifting adjustment and synchronous lifting adjustment of each suspension oil cylinder, so that the device can adapt to different road conditions and different driving state requirements, and the driving performance of vehicles is improved.
Drawings
FIG. 1 is a schematic structural diagram of a hydro-pneumatic suspension system provided by an embodiment of the present invention;
in the figure: 1. a left suspension oil cylinder of the bridge; 2. 3, 7, 8, hanging a control valve group; 4. a bridge right suspension oil cylinder; 5. a flow dividing valve block; 6. a second bridge right suspension oil cylinder; 9. a two-axle left suspension oil cylinder; 10. a hydraulic oil tank; 11. a gear pump; 12. a motor; 13. a directional valve; 14. a one-way valve; 15. an overflow valve.
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 a hydro-pneumatic suspension system comprising:
a hydraulic pump: the P oil port is connected with the axle pressure oil path LPAnd a T oil port is connected with an axle oil return path LT；
At least two suspension cylinder groups: each suspension oil cylinder group corresponds to one axle 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.
Hanging a control valve group: each group of suspension oil cylinders is arranged corresponding to each suspension oil cylinder and comprises a rod cavity capable of connecting the corresponding suspension oil cylinder and an axle pressure oil circuit 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.
A flow dividing valve group: connected between the suspension control valve groups 2, 3, 7 and 8 and the hydraulic pump and can supply oil from the axle pressure oil path LPThe oil liquid is equally divided into flow rates according to the number of the suspension oil cylinders and each suspension control valveThe control of the groups 2, 3, 7 and 8 is matched to realize the independent lifting adjustment and the synchronous lifting adjustment of each suspension oil cylinder.
The oil-gas suspension system provided by the embodiment of the invention is provided with suspension control valve groups 2, 3, 7 and 8 and a shunt valve group 5, wherein the suspension control valve groups 2, 3, 7 and 8 can be used for switching and connecting rod cavities of corresponding suspension oil cylinders with an axle pressure oil circuit and an axle oil return circuit, and connecting rodless cavities of the corresponding suspension oil cylinders with rod cavities of another suspension oil cylinder in the same group; the flow distribution valve group 5 can equally distribute the flow of oil from the axle pressure oil path according to the number of the suspension oil cylinders, and is matched with the control of each suspension control valve group 2, 3, 7 and 8 to realize independent lifting adjustment of each suspension oil cylinder, synchronous lifting adjustment of any two suspension oil cylinders and synchronous lifting adjustment of all suspension oil cylinders, so that the requirements of different road conditions and different driving states can be met, and the driving performance of the vehicle is improved.
As shown in fig. 1, the hydraulic pump in the embodiment of the present invention includes a gear pump 11 and a motor 12 driving the gear pump 11. 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. In the embodiment of the invention, two groups of suspension oil cylinder groups are arranged, four suspension oil cylinders are provided, and the suspension oil cylinder group is suitable for a two-shaft vehicle acted by two pairs of suspension oil cylinders. It should be understood, however, that the number of suspension cylinder groups is not limited to two, and may be configured appropriately according to the number of axles of the vehicle, and may be expanded accordingly according to fig. 1 based on the same technical concept of the present invention. The suspension control valve groups 2, 3, 7, 8 and the shunt valve group 5 are further described in detail below by taking the suspension control valve group 2 connected to the left suspension cylinder 1 of one axle as an example.
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 includes a three-position four-way valve, a first switching valve Y113 and a second switching valve Y114. The three-position four-way valve can select 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 over by electrifying to realize switching conduction of the first oil port, the second oil port, the third oil port and the fourth oil port. Wherein, the first oil port passes through the first switch valveY113 is connected with a rod cavity of the left suspension oil cylinder 1 of the axle, a second oil port is connected with a rodless cavity of the left suspension oil cylinder 1 of the axle through a second switch valve Y114, a third oil port is connected with a corresponding oil outlet of the flow dividing valve group 5, and a fourth oil port is connected with an axle oil return circuit LTAnd (4) connecting. And the three-position four-way valve is electrified and reversed, so that the first oil port and the second oil port are switched and conducted with the third oil port and the fourth oil port respectively, and the extension and retraction actions of the left suspension oil cylinder 1 of the bridge are realized.
The switch valve block in the embodiment of the invention comprises a first switch valve Y113 connected with a rodless cavity of a suspension oil cylinder and a second switch valve Y114 connected with a rod cavity of another suspension oil cylinder in the same suspension oil cylinder group, wherein the first switch valve Y113 and the second switch valve Y114 are respectively connected with an energy accumulator. In the embodiment of the invention, the oil port of the energy accumulator is also connected with a manual adjustable damping valve which is used for adjusting the damping and rigidity of the hydro-pneumatic suspension system, so that the suspension system is suitable for different road conditions.
The shunt valve group comprises a third switch valve connected between the suspension oil cylinder control valve and the axle oil return path; when the suspension oil cylinder does not need to act, the third switch valve corresponding to the suspension oil cylinder is opened, and oil flowing out of the flow dividing valve group flows back to the axle oil return circuit through the third switch valve. Specifically, the third switch valve is connected between a third oil port of the three-position four-way valve and the axle oil return path. The third on/off valves Y1, Y2, Y3 and Y4 are used to supply electricity when the corresponding suspension cylinder is not required to operate, and to allow the oil to flow back to the hydraulic tank 10 without affecting the operation of the other suspension cylinders.
The flow dividing valve group simultaneously comprises a plurality of cascaded flow dividing valves, and oil from the axle pressure oil path is divided by the flow dividing valves step by step and flows to the suspension control valve groups 2, 3, 7 and 8. In the embodiment of the invention, three halving flow dividing valves 5-1, 5-2 and 5-3 are arranged to adapt to four suspension oil cylinders 1, 4, 6 and 9, so that oil is quartered. The specification of the flow divider 5-2 is the same as that of the flow divider 5-3, and the flow rate of the flow divider 5-1 is the sum of the flow rates of the flow divider 5-2 and the flow divider 5-3. The flow divider 5-1 divides oil from an axle pressure oil path into two equal parts, the flow rates flowing to the flow divider 5-2 and the flow divider 5-3 are equal, the flow divider 5-2 and the flow divider 5-3 divide the flow rate from the flow divider 5-1 equally, four oil branches with equal flow rates are obtained, and the four oil branches flow to four suspension oil cylinders 1, 4, 6 and 9 through four suspension control valve groups 2, 3, 7 and 8 respectively.
In the embodiment of the invention, the axle pressure oil circuit is also connected with the hydraulic oil tank 10 through the directional valve, when the suspension system is completely and rigidly locked, the directional valve is not electrified, and if the motor 12 of the hydraulic pump is started, all oil liquid flows back to the hydraulic oil tank 10.
In the embodiment of the invention, an oil port of a hydraulic pump connected with an axle pressure oil path is also connected with a check valve 14 for preventing oil from flowing back, and an oil inlet of the check valve 14 is connected with an overflow valve 15.
The embodiment of the invention also provides a vehicle which comprises the hydro-pneumatic suspension system, the number of the suspension oil cylinder groups is not limited to two, one group can be arranged correspondingly 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 correspondingly. The number of the third switch valves, the number of the shunt valves and the cascade relation in the shunt valve group can be determined according to the number of the suspension oil cylinders, the shunt valves are not limited to halving shunt valves, other equal-fraction shunt valves can be adopted, and the skilled person can select the shunt valves according to actual needs. Without departing from the technical principle of the present invention, several modifications and variations can be made, and these modifications and variations should also be regarded as the protective scope of the present invention.
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 Y0 is de-energized by default and the gear pump 11 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 switching valves Y115 and Y116 in the suspension control valve group 2 are powered, the switching valves Y125 and Y126 in the suspension control valve group 3 are powered, the switching valves Y225 and Y226 in the suspension control valve group 7 are powered, the switching valves Y215 and Y216 in the suspension control valve group 8 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 with the energy accumulator, so that the anti-roll effect is achieved.
Suspension rigidity scheme: all switch valves in the suspension control valve group are not powered, oil passages of a rodless cavity and a rod cavity of the suspension oil cylinder are not communicated at the moment, and any cavity of the energy accumulator and the suspension oil cylinder is not communicated. The directional valve Y0 is not energized and if the motor 12 is activated, all of the oil flows back to the hydraulic reservoir 10.
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 12 is started, the directional valves Y0, Y2, Y3 and Y4 are electrified, Y112, Y113, Y114 and Y115 in the suspension control valve group 2 are electrified, oil is fed into a rod cavity and oil is fed back 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 12 is started, the directional valve Y0 is electrified, Y111, Y113, Y114 and Y115 in the suspension control valve group 2 are electrified, oil is fed into a rodless cavity and returned into a rod cavity of the left suspension oil cylinder 1 of the bridge at the moment, 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 as an example, the motor 12 is started, the directional valves Y0, Y3 and Y4 are electrified, Y111, Y113, Y114, Y115, Y121, Y123, Y124 and Y125 in the suspension control valve group are electrified, at the moment, the rodless cavities of the left bridge suspension oil cylinder 1 and the right bridge suspension oil cylinder 4 are fed with oil, the rod cavities are fed with oil, and the extension action of the left bridge suspension oil cylinder is realized; when the motor 12 is started, the directional valve Y0 is electrified, Y112, Y113, Y114, Y115, Y122, Y123, Y124 and Y125 in the suspension control valve group are electrified, the left suspension oil cylinder 1 and the right suspension oil cylinder 4 of the bridge have rod cavities for oil feeding and rodless cavity for oil returning, and the suspension oil cylinder of the bridge realizes retraction.
The same-side regulation scheme comprises the following steps: taking the left suspension cylinder group as an example, the motor 12 is started, the directional valves Y0, Y2 and Y4 are electrified, the suspension control valve groups Y111, Y113, Y211 and Y213 in the suspension control valve groups 2 and 8 are electrified, at the moment, the rodless cavities of the first-bridge left suspension cylinder 1 and the second-bridge left suspension cylinder 9 feed oil, and return oil with rod cavities, and the left suspension cylinder realizes the extension action; the motor 12 is started, the directional valve Y0 is electrified, Y112, Y113, Y212 and Y213 in the suspension control valve groups 2 and 8 are electrified, at the moment, the rod cavities of the first-bridge left suspension oil cylinder 1 and the second-bridge left suspension oil cylinder 9 are filled with oil, the rodless cavities are filled with oil, and the left suspension oil cylinder group realizes retraction.
Lifting adjustment of the whole vehicle: the motor 12 is started, the directional valve Y0 is electrified, Y112, Y113, Y114, Y115, Y122, Y123, Y124, Y125, Y212, Y213, Y214, Y215, Y222, Y223, Y224 and Y225 in the suspension control valve group are electrified, at the moment, oil is fed into the rod cavities of the four suspension oil cylinders 1, 4, 6 and 9, oil is fed into the rod cavities, and oil is fed back into the rodless cavities, so that the whole vehicle suspension oil cylinder realizes retraction action; the motor 12 is started, the directional valve Y0 is electrified, Y111, Y113, Y114, Y115, Y121, Y123, Y124, Y125, Y211, Y213, Y214, Y215, Y221, Y223, Y224 and Y225 in the suspension control valve group are electrified, at the moment, oil is fed into the rodless cavities of the four suspension oil cylinders 1, 4, 6 and 9, oil is returned from the rod cavities, and the suspension oil cylinder of the whole vehicle realizes the 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 shunt valve group can ensure synchronous action of all the suspension oil cylinders, and the third switch valve can realize independent action of all the suspension oil cylinders, so that mutual interference is avoided, and the synchronization efficiency is improved; 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. An hydro-pneumatic suspension system, comprising:
a hydraulic pump: connecting an axle pressure oil path and an axle oil return path;
at least two suspension cylinder groups: each suspension oil cylinder group corresponds to one axle and comprises a left suspension oil cylinder (1, 9) arranged on the left side of the corresponding axle and a right suspension oil cylinder (4, 6) arranged on the right side of the corresponding axle;
suspension control valve group (2, 3, 8, 7): each suspension oil cylinder is provided with a group corresponding to each suspension oil cylinder, and each group comprises a switching control valve block which can switch and connect a rod cavity of the corresponding suspension oil cylinder with an axle pressure oil circuit and an axle oil return 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;
a flow dividing valve group (5): the hydraulic control system is connected between the suspension control valve group and the hydraulic pump, can equally divide the flow of oil from the axle pressure oil circuit according to the number of the suspension oil cylinders, and is matched with the control of each suspension control valve group to realize independent lifting adjustment and synchronous lifting adjustment of each suspension oil cylinder.
2. The hydro-pneumatic suspension system of claim 1, wherein the switching control valve block includes a three-position four-way valve, a first on-off valve (Y113, Y123, Y213, Y223) and a second on-off valve (Y114, Y124, Y214, Y224), a first port of the three-position four-way valve is connected to the rod chamber of the corresponding suspension cylinder via the first on-off valve, a second port is connected to the rodless chamber of the corresponding suspension cylinder via the second on-off valve, a third port is connected to the corresponding oil outlet of the set of shunt valves, and a fourth port is connected to the axle return; and the three-position four-way valve is electrified and reversed, so that the first oil port and the second oil port are switched and conducted with the third oil port and the fourth oil port respectively, and the extension and retraction actions of the suspension oil cylinder are realized.
3. The hydro-pneumatic suspension system of claim 1 or 2, wherein the switching valve block comprises a first switching valve (Y115, Y125, Y215, Y225) connected to the rodless chamber of a suspension cylinder and a second switching valve (Y116, Y126, Y216, Y226) connected to the rod chamber of another suspension cylinder in the same suspension cylinder group, the first and second switching valves being connected to the accumulator, respectively.
4. The hydro-pneumatic suspension system as defined in claim 3, wherein an adjustable damping valve (2-0) or an electric proportional switch valve (2-0) is connected to the oil port of the accumulator.
5. The hydro-pneumatic suspension system of claim 1 or 2, wherein the flow manifold includes a third on/off valve (Y1, Y2, Y3, Y4) connected between the suspension cylinder control valve and the axle return; when the suspension oil cylinder does not need to act, the third switch valve corresponding to the suspension oil cylinder is opened, and oil flowing out of the flow dividing valve group flows back to the axle oil return circuit through the third switch valve.
6. The hydro-pneumatic suspension system of claim 1 or 2, wherein the set of splitter valves comprises a plurality of cascaded splitter valves (5-1, 5-2, 5-3), and oil from the axle pressure oil path is divided by the splitter valves in stages to flow to the set of suspension control valves.
7. An oleo-pneumatic suspension system according to claim 1, characterized in that the axle pressure circuit is also connected to the hydraulic tank (10) by means of a directional valve (13), the directional valve (13) being not energized when the suspension is fully latched rigid, and the oil flows all the way back to the hydraulic tank (10) if the motor of the hydraulic pump is activated.
8. The hydro-pneumatic suspension system as claimed in claim 1, wherein a check valve (14) 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 check valve (14).
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;
independent control is carried out on corresponding branches in a suspension control valve group and a shunt valve group of a target suspension oil cylinder so as to enable the target suspension oil cylinder to realize independent extension and independent retraction;
the oil-gas suspension system enters a coaxial adjusting state by synchronously controlling corresponding branches in two suspension control valve sets and a shunt valve set of the same axle;
synchronously controlling corresponding branches in the suspension control valve group and the shunt valve group on the same side of each axle so as to enable the oil-gas suspension system to enter a same-side regulation state;
the oil-gas suspension system enters a whole vehicle lifting regulation state by synchronously controlling all suspension control valve groups and corresponding branches in the shunt valve group.
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| CN117774583A (en) * | 2023-12-29 | 2024-03-29 | 徐州徐工港口机械有限公司 | Self-adaptive suspension adjustment control system for multi-axis vehicle |
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