CN109540554B - Commercial car air suspension system function test rack and system - Google Patents
Commercial car air suspension system function test rack and system Download PDFInfo
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- CN109540554B CN109540554B CN201910006495.1A CN201910006495A CN109540554B CN 109540554 B CN109540554 B CN 109540554B CN 201910006495 A CN201910006495 A CN 201910006495A CN 109540554 B CN109540554 B CN 109540554B
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- 239000000725 suspension Substances 0.000 title claims abstract description 161
- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 238000011990 functional testing Methods 0.000 claims abstract description 30
- 230000008093 supporting effect Effects 0.000 claims abstract description 17
- 238000001514 detection method Methods 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 14
- 230000011664 signaling Effects 0.000 claims description 2
- 238000011217 control strategy Methods 0.000 abstract description 9
- 238000012827 research and development Methods 0.000 description 13
- 230000035939 shock Effects 0.000 description 11
- 239000006096 absorbing agent Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000008602 contraction Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
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- 239000000203 mixture Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/04—Suspension or damping
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Abstract
The invention discloses a functional test bench and a functional test system for an air suspension system of a commercial vehicle. The test bench comprises a chassis framework, wheels, a suspension device and a rear lifting bridge assembly; the wheels are arranged on the chassis framework through a suspension device; the rear lifting bridge assembly is connected with the chassis framework; the chassis framework comprises at least two U-shaped portal frames, a supporting frame and a plurality of connecting rods; the upright posts between the U-shaped portal frames are detachably connected through at least one connecting rod; the support frame is vertically connected with the upright post of the U-shaped portal frame and extends towards the direction of the wheel; the suspension device is arranged on the chassis framework through a connecting rod and a supporting frame, and the rear lifting bridge assembly comprises a rear lifting bridge bracket, a lifting bridge, at least one air cylinder and two air springs; the air springs are symmetrically arranged on two sides of the air cylinder. The invention can dynamically simulate the motion states of the vehicle body, the suspension device and the wheels when the vehicle runs on different roads, thereby being convenient for optimizing the control strategy of the air suspension system according to the motion state parameters of the vehicle body, the suspension device and the wheels.
Description
Technical Field
The invention relates to the technical field of functional test of air suspension systems, in particular to a functional test bench and a functional test system of an air suspension system of a commercial vehicle.
Background
At present, the vehicle air suspension system not only can buffer and absorb shock, but also can control the height of the vehicle chassis according to road conditions and the load of the vehicle, so that the comfort and the trafficability of the vehicle are improved, the phenomenon that the vehicle encounters uneven roads to damage the chassis of the vehicle in the running process is avoided, and the safety of the vehicle is greatly improved, and therefore, the vehicle air suspension system is favored by vast users.
Testing of the functionality of a vehicle air suspension system is particularly important during its development. The existing air suspension system function test platform is mainly a bench test bench, and the bench test bench comprises a four-column frame, an upper cover plate, a lower cover plate and a functional mechanism, wherein the functional mechanism (comprising an air compressor, an air cylinder, an air spring, a shock absorber, an electromagnetic valve group, an information acquisition unit, an ECU control unit and the like) is arranged in the frame. The bench test bench can only test whether the air suspension system can receive and execute the instruction correctly, and can not simulate the motion state of the automobile body, the air suspension and the tire after the air spring is regulated. When the vehicle runs on different road conditions, the motion states of the vehicle body, the air suspension and the tires are changed, and different control strategies need to be adopted for the air suspension system. It can be seen that the existing air suspension system function test platform cannot meet the research and development requirements of the vehicle air suspension system.
Disclosure of Invention
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a functional test stand and system for a commercial vehicle air suspension system that overcomes or at least partially solves the above problems.
In accordance with one aspect of the present invention, there is provided a commercial vehicle air suspension system functional test stand comprising a chassis frame, wheels, a suspension and a rear lift axle assembly; the wheels are arranged on the chassis framework through the suspension device; the rear lifting bridge assembly is connected with the chassis framework;
The chassis framework comprises at least two U-shaped portal frames, a supporting frame and a plurality of connecting rods; the upright posts between the U-shaped portal frames are detachably connected through at least one connecting rod; the support frame is vertically connected with the upright post of the U-shaped portal frame and extends towards the direction of the wheels; the suspension device is arranged on the chassis framework through the connecting rod and the supporting frame; the rear lifting bridge assembly comprises a rear lifting bridge bracket, a lifting bridge, at least one cylinder and two air springs; the air springs are symmetrically arranged on two sides of the air cylinder, one end of each air spring is connected with the rear lifting bridge bracket, and the other end of each air spring is connected with the lifting bridge; one end of the air cylinder is connected with the rear lifting bridge support, and the other end of the air cylinder is connected with the lifting bridge.
Preferably, the upright post of the U-shaped portal frame is slidably connected with the connecting rod;
Preferably, the support frame is slidably connected with the upright post of the U-shaped portal frame.
Preferably, the U-shaped portal frame, the connecting rod and the supporting frame comprise a chute structure.
Preferably, the support frame is provided with a transverse connecting rod or a longitudinal connecting rod corresponding to the corresponding position of the suspension device.
Preferably, the U-shaped portal frame, the connecting rod and the support frame comprise a telescopic adjusting structure.
Preferably, the support frame is used for bearing a counterweight object.
According to one aspect of the present invention, there is provided a commercial vehicle air suspension system function test system comprising at least one air compressor, a gas cylinder, a solenoid valve block, a detection unit, an ECU control unit and the air suspension system function test bench described above; the air compressor is connected with the air spring assembly of the suspension device and/or the air spring and the air cylinder of the rear lifting bridge assembly sequentially through the air storage bottle, the electromagnetic valve group;
the air spring assembly, the air spring and the air cylinder are correspondingly provided with the detection unit; each ECU control unit is connected with the corresponding detection unit and the corresponding electromagnetic valve group;
The detection unit is used for detecting the height information of the chassis framework and/or the height information of the rear lifting bridge assembly, and sending the height information to the ECU control unit; and pressure information for detecting the air spring assembly, the air spring and the cylinder and transmitting the pressure information to an ECU control unit;
The ECU control unit is used for receiving the height information and/or the pressure information sent by the detection unit, comparing the height information and/or the pressure information with corresponding threshold values, and sending control signals to the electromagnetic valve group according to the comparison result;
and the electromagnetic valve group is used for operating according to the control signal and controlling the expansion quantity or expansion speed of the air spring component of the suspension device and/or the air spring and the air cylinder of the rear lifting bridge assembly, so as to control the lifting height or lifting speed of the chassis framework or the rear lifting bridge.
Preferably, the test system further comprises a wireless communication module and a remote controller, wherein the remote controller is in data communication with the ECU through the wireless communication module;
The wireless communication module is used for receiving the control signal sent by the remote controller and sending the control signal to the ECU.
Preferably, the test system further comprises a display screen, and the display screen is connected with the ECU and used for displaying the states and the operation parameters of all devices in the air suspension system function test system.
The beneficial effects of the invention are as follows: according to the technical scheme, the chassis framework is designed, the wheels are installed and fixed on the chassis framework through the suspension device, so that the motion states of the vehicle body, the suspension device and the wheels when the vehicle runs on different roads can be dynamically simulated, the control strategy of the air suspension system can be optimized according to the motion state parameters of the vehicle body, the suspension device and the wheels, and the performance of the air suspension system is improved. The functional test bench of the air suspension system can be applied to a technical research and development stage, is convenient for technical research and development personnel to optimize the control strategy of the air suspension system, and outputs high-quality research and development results; the air suspension system can also be applied to the experimental teaching stage, so that teachers can dynamically demonstrate the structural composition and working process of the air suspension system, and the understanding and operation ability of students are enhanced.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 illustrates a schematic perspective view of a functional test stand for a commercial vehicle air suspension system in accordance with one embodiment of the present invention;
FIG. 2 illustrates a schematic structural view of a chassis skeleton in accordance with one embodiment of the present invention;
FIG. 3 shows a schematic structural view of a support frame according to an embodiment of the present invention;
FIG. 4 illustrates another schematic structural view of a support frame according to one embodiment of the present invention;
FIG. 5 illustrates a schematic installation of a dual yoke suspension in accordance with one embodiment of the present invention;
FIG. 6 illustrates a schematic installation of a McPherson arm suspension according to one embodiment of the invention;
FIG. 7 illustrates a schematic perspective view of another commercial vehicle air suspension system functional test stand in accordance with one embodiment of the present invention;
FIG. 8 illustrates a schematic structural view of a rear lift bridge in accordance with one embodiment of the present invention;
FIG. 9 illustrates a functional architecture diagram of a commercial vehicle air suspension system functional test system in accordance with one embodiment of the present invention;
In the figure: 100. an air suspension system function test bench; 110. a chassis skeleton; 111. a U-shaped portal frame; 112. a support frame; 1121. a transverse connecting rod; 1122. a longitudinal connecting rod; 113. a connecting rod; 120. a wheel; 130. a suspension device; 131. a double-fork arm type suspension device; 1311. an upper swing arm; 1312. a lower swing arm; 1313. an air spring assembly; 132. macpherson suspension device; 1321. a lower swing arm; 1322. an air spring assembly; 133. a multi-link suspension device; 140. a rear lift axle assembly; 141. a rear lifting bridge bracket; 142. a lifting bridge; 143. a cylinder; 144. an air spring; 200. an air suspension system function test system; 210. an air compressor; 220. a gas cylinder; 230. an electromagnetic valve group; 240. a detection unit; 250. an ECU control unit; 260. a wireless communication module; 270. a remote controller; 280. and a display screen.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
FIG. 1 illustrates a schematic perspective view of a functional test stand for a commercial vehicle air suspension system according to an embodiment of the present application, and as shown in FIG. 1, the functional test stand 100 for the air suspension system includes a chassis frame 110, wheels 120, and a suspension 130; the wheels 120 are mounted on the chassis frame 110 by suspension means 130; the number of suspension devices may or may not correspond to the number of wheels. For example, the number of wheels is 4, the number of suspension devices is 2, and the suspension devices are provided corresponding to two wheels of the rear axle. The number of the wheels and the suspension devices is 4, and each wheel is correspondingly provided with one suspension device. The application is not further limited to the number of wheels and suspension devices. FIG. 2 shows a schematic structural view of a chassis skeleton according to one embodiment of the present application, and as shown in FIG. 2, the chassis skeleton 110 includes at least two U-shaped gantry frames 111, a support frame 112, and a plurality of connecting rods 113; the upright posts between the two U-shaped portal frames 111 are detachably connected through at least one connecting rod 113; the support frame 112 is vertically connected with the upright post of the U-shaped portal frame 111 and extends towards the wheel direction; the suspension 130 is mounted to the chassis frame 110 by means of the connection rod 113 and the support bracket 112.
Therefore, the technical scheme of the invention designs the chassis framework, and the wheels are installed and fixed on the chassis framework through the suspension device, so that the motion states of the vehicle body, the suspension device and the wheels can be dynamically simulated when the vehicle runs on different roads, and the control strategy of the air suspension system can be optimized according to the motion state parameters of the vehicle body, the suspension device and the wheels, and the performance of the air suspension system can be improved. The functional test bench of the air suspension system can be applied to a technical research and development stage, is convenient for technical research and development personnel to optimize the control strategy of the air suspension system, and outputs high-quality research and development results; the air suspension system can also be applied to the experimental teaching stage, so that teachers can dynamically demonstrate the structural composition and working process of the air suspension system, and the understanding and operation ability of students are enhanced.
In one embodiment of the present invention, the upright post of the U-shaped portal frame 111 is slidably connected to the connecting rod 113, so as to facilitate adjusting the position of the connecting rod up and down, thereby adapting to the self characteristics of different types of hanging devices. Of course, the upright post of the U-shaped portal frame 111 and the connecting rod 113 may be fixedly connected.
In one embodiment of the present invention, the support 112 is slidably connected to the upright of the U-shaped gantry 111, and when adjusting the position of the connecting rod still fails to optimize the telescopic stroke of the suspension device, the position of the support 112 on the upright of the U-shaped gantry 111 can be adjusted up and down to optimize the telescopic stroke of the suspension device. Of course, the position of the support frame on the upright of the U-shaped portal frame 111 may be directly adjusted without adjusting the position of the connecting rod 113, so that the telescopic stroke of the suspension device is optimal. Specifically, in order to make the upright post of the U-shaped gantry 111 slidably connected with the connection rod 113, the support frame 112 slidably connected with the upright post of the U-shaped gantry 111, and the U-shaped gantry 111, the connection rod 113, and the support frame 112 each include a chute structure. In this case, the connection rod 113 may have a chute structure, and both the U-shaped gantry 111 and the support frame 112 may be formed by the connection rod 113.
According to the two embodiments, the length and the height of the chassis framework are adjustable, so that the state of vehicle types with different wheelbases and wheelbase can be simulated, and the hanging devices with different forms and different strokes are installed, so that the air suspension system function test bench is not only suitable for the air suspension system function test of a passenger vehicle, but also suitable for the air suspension system function test of a commercial vehicle, and has a wide application range.
In one embodiment of the present invention, fig. 3 shows a schematic structural diagram of a support frame according to one embodiment of the present invention, fig. 4 shows a schematic structural diagram of another support frame according to one embodiment of the present invention, and as shown in fig. 3, a transverse connection rod 1121 is disposed at a position of the support frame 112 corresponding to the suspension device 130, and the transverse connection rod 1121 is used to connect an air spring assembly in the suspension device 130. As shown in fig. 4, the support frame 112 is provided with a longitudinal connecting rod 1122 corresponding to the suspension device 130, and the longitudinal connecting rod 1122 is used to connect the air spring assembly in the suspension device 130.
It should be noted that, the supporting frame structures shown in fig. 3 and fig. 4 are both grid-type structures, but the grid-type structures and the triangle-type structures are all within the protection scope of the present application, so long as the supporting frame can ensure the normal installation of the air spring assembly in the suspension device, the present application does not limit the structure of the supporting frame further.
In one embodiment of the present invention, the U-shaped gantry 111, the connection rod 113 and the support frame 112 include a telescopic structure, and the lengths of the U-shaped gantry 111, the connection rod 113 and the support frame 112 can be adjusted by adjusting the telescopic structure, so that the lengths and heights of different vehicle bodies can be more conveniently simulated. According to the embodiment, the length and the height of the chassis framework are adjustable, so that the vehicle type state of different wheelbases and wheelbase can be simulated, and the suspension devices with different forms and different strokes are installed, so that the air suspension system function test bench is not only suitable for the air suspension system function test of a passenger vehicle, but also suitable for the air suspension system function test of a commercial vehicle, and has a wide application range.
Different vehicle weights correspond to different control strategies of the air suspension system, for example, if the vehicle body is kept at the same height, the air pressure value inside the air spring needs to be increased when the vehicle weight is gradually increased. In the prior art, in order to determine the relation between different weights of a vehicle and air pressure values inside an air spring, a mechanical spring is added on a guide rod of the air spring damper, and the weights are simulated by changing the expansion and contraction amount of the mechanical spring. However, in the process of testing the air suspension system, when the expansion and contraction amount of the air spring is changed, the expansion and contraction amount of the mechanical spring is also changed, so that the weight value of the vehicle is changed, and the test result is not accurate enough.
To solve the above technical problem, in one embodiment of the present invention, the counterweight object is carried by the support frame 112. In the air suspension system testing process, the weight of the counterweight object can be changed at will according to actual requirements, and the weight of the counterweight object cannot change along with the expansion and contraction amount of the air spring, so that the testing precision of the air suspension system function is improved.
Further, the suspension 130 includes a double-wishbone suspension 131, a macpherson suspension 132, and a multi-link suspension 133, and the following description will be given of the mounting of the suspension 130 on the chassis frame 110 by taking the double-wishbone suspension 131 and the macpherson suspension 132 as examples:
A double-wishbone suspension 131 is mounted to chassis frame 110.
FIG. 5 illustrates a schematic installation of a dual yoke suspension in accordance with one embodiment of the present invention; the double-fork arm type suspension device 131 mainly comprises an upper swing arm 1311, a lower swing arm 1312 and an air spring assembly 1313; when the double-fork arm type suspension device 131 is installed on the chassis framework 110, the U-shaped portal frame 111 is detachably connected through the two connecting rods 113, and an upper swing arm 1311 and a lower swing arm 1312 of the double-fork arm type suspension device 131 are respectively and movably hinged with the connecting rods 113; the air spring assembly 1313 comprises an air spring 1313_1 and a shock absorber 1313_2, when the air spring 1313_1 and the shock absorber 1313_2 are coaxial, the air spring 1313_1 is sleeved on a connecting rod of the shock absorber 1313_2, one end of the air spring assembly 1313 is movably hinged on the lower swing arm 1312, and the other end is movably hinged on the support frame 112; when the air spring 1313 and the damper 1314 are not coaxial, one end of the damper 1313_2 is movably hinged on the lower swing arm 1312, and the other end is movably hinged on the support frame 112; one end of the air spring 1313_1 is movably hinged on the lower swing arm 1312, and the other end is movably hinged on the support frame 112; an expansion space of the air spring 1313_1 is reserved between the air spring 1313_1 and the shock absorber 1313_2.
And (II) a Macpherson suspension 132 is mounted to chassis frame 110.
FIG. 6 illustrates a schematic installation view of a McPherson arm suspension 132, which basically includes a lower swing arm 1321 and an air spring assembly 1322, according to one embodiment of the invention, the U-shaped gantry 111 is removably coupled by a connecting rod 113 when the McPherson arm suspension 132 is installed on the chassis frame 110; the lower swing arm 1321 is movably hinged with the connecting rod 113; the air spring assembly 1322 comprises an air spring 1322_1 and a shock absorber 1322_2, when the air spring 1322_1 and the shock absorber 1322_2 are coaxial, one end of the air spring assembly 1322 is movably hinged on the lower swing arm 1321, and the other end is movably hinged on the support frame 112; when the air spring 1322_1 and the shock absorber 1322_2 are not coaxial, one end of the shock absorber 1322_2 is movably hinged on the lower swing arm 1321, and the other end is movably hinged on the support frame 112; one end of the air spring 1322_1 is movably hinged on the lower swing arm 1321, and the other end is movably hinged on the support frame 112; an expansion space of the air spring 1322_1 is reserved between the air spring 1322_1 and the shock absorber 1322_2.
If the macpherson suspension 132 is currently mounted on the chassis frame 110, one connecting rod 113 may be continuously mounted between the U-shaped gantry frames 111 when the double-wishbone suspension 131 is continuously mounted on the chassis frame 110. If the dual-wishbone suspension 131 is currently mounted on the chassis frame 110, then the upper swing arm 1311 or the lower swing arm 1312 of the corresponding dual-wishbone suspension 131 can be detached or the upper swing arm 1311 or the lower swing arm 1312 of the dual-wishbone suspension 131 can be used as the lower swing arm 1321 of the macpherson suspension 132 when the macpherson suspension 132 is continuously mounted on the chassis frame 110. In addition, when the multi-link suspension 133 is mounted on the chassis frame 110, the number, position and length of the connection rods 113 are adaptively set according to the structural characteristics of the multi-link suspension 133, and the height of the support frame 112 is adaptively adjusted, so that the multi-link suspension 133 is successfully mounted on the chassis frame 110. According to the technical scheme, the double-fork arm type suspension device 131, the McPherson type suspension device 132 and the multi-link type suspension device 133 can be arranged on the chassis framework 110 according to the requirements, so that the research and development requirements of technicians can be met, and the demonstration requirements of a school experiment table can be met.
In the prior art, the rear lifting axle assembly mainly uses an air spring as a lifting assembly, and meanwhile, a guide structure is additionally arranged for the air spring, so that the structure is complex. To simplify the structure of the rear lift bridge while ensuring the normal function of the rear lift bridge, fig. 7 is a schematic perspective view illustrating another functional test bench for an air suspension system of a commercial vehicle according to an embodiment of the present invention, and fig. 8 is a schematic view illustrating the structure of a rear lift bridge according to an embodiment of the present invention; as shown in fig. 7-8, the air suspension system functional test stand 100 further includes a rear lift bridge assembly 140, the rear lift bridge assembly 140 being connected to the chassis frame 110; rear lift bridge assembly 140 includes a rear lift bridge bracket 141, a lift bridge 142, at least one air cylinder 143, and at least two air springs 144; the two air springs 144 are symmetrically arranged at two sides 143 of the air cylinder, one end of each air spring 144 is connected with the rear lifting bridge bracket 141, and the other end of each air spring 144 is connected with the lifting bridge 142; one end of the air cylinder 143 is connected to the rear lift bridge bracket 141, and the other end is connected to the lift bridge 142.
The rear lift axle assembly 140 operates as follows:
when the vehicle runs fully, the wheels in the rear lift axle assembly 140 run on the ground, the two air springs 144 are in an inflated state, and the pistons of the two air cylinders 143 are in a stretched state under the gravity of the rear lift axle assembly 140 and the supporting action of the two air springs 144, so that the wheels in the rear lift axle assembly 140 are supported to run on the ground.
And (II) when the vehicle is converted from the full-load state to the empty or light-load state of the vehicle, the air springs 144 begin to deflate, and the air cylinders 143 begin to inflate, so that the pistons of the air cylinders 143 drive the rear lift bridge assembly 140 to move upwards, and the rear lift bridge assembly 140 is lifted.
And (III) when the vehicle changes from an empty state to a full state, air cylinder 143 begins to deflate and air spring 144 begins to inflate, air spring 144 moves rear lift axle assembly 140 downward, and the wheels in rear lift axle assembly 140 contact the ground.
Therefore, the air spring plays a supporting role in the technical scheme, the air cylinder plays a lifting and guiding role, and compared with the rear lifting bridge in the prior art, the rear lifting bridge can realize a lifting function by additionally arranging the guiding structure, the structure of the rear lifting bridge is simplified, and the rear lifting bridge is more suitable for a research and development test stage or a teaching demonstration stage.
In this embodiment, as shown in fig. 8, the number of air springs 144 and air cylinders 143 is two, the lifting bridge is provided with a supporting plate, the two air cylinders 143 are symmetrically arranged on the supporting plate along the front-rear direction, the two air springs 144 are symmetrically arranged on the supporting plate along the left-right direction by the two air cylinders 143, and the air springs 144 and the air cylinders 143 are symmetrically arranged in the technical scheme of the invention, so that the front-rear pitching or left-right rolling state of the rear lifting bridge caused by uneven stress can be prevented when the rear lifting bridge assembly works.
In another embodiment of the present application, there are two air springs 144, one air cylinder 143, a supporting plate is provided on the lift bridge, the air cylinder 143 is provided at the center of the supporting plate, and the two air springs 144 are symmetrically provided at the left and right sides of the air cylinder 143 in the left and right direction. The operation of the rear lift axle assembly 140 is the same as that of the previous embodiment, and the same contents are not repeated. The application does not further limit the number and the positions of the air springs and the air cylinders in the rear lifting bridge assembly, so long as the normal operation of the rear lifting bridge assembly is ensured.
FIG. 9 illustrates a functional structural schematic diagram of a commercial vehicle air suspension system functional test system according to an embodiment of the present invention, and as shown in FIG. 9, the air suspension system functional test system 200 includes at least one air compressor 210, a gas cylinder 220, a solenoid valve group 230, a detection unit 240, an ECU control unit 250, and the air suspension system functional test bench 100 as shown in FIGS. 1-8; air compressor 210 is connected to air spring assembly (1313 or 1322) of suspension 130 and/or air spring 144 and air cylinder 143 of rear lift bridge assembly 140 sequentially through air cylinder 220, solenoid valve block 230;
The air spring assembly (1313 or 1322), the air spring 144, and the air cylinder 143 are provided with the detection unit 240, respectively; each ECU control unit 250 is connected with a corresponding detection unit 240 and solenoid valve group 230;
The detecting unit 240 is configured to detect height information of the chassis frame 110 and/or height information of the rear lift axle assembly 140, and transmit the height information to the ECU control unit 250; and pressure information for detecting air spring assembly (1313 or 1322), air spring 144, and cylinder 143, and transmitting the pressure information to ECU control unit 250;
The ECU control unit 250 is configured to receive the height information and/or the pressure information sent by the detection unit 240, compare the height information and/or the pressure information with corresponding threshold values, and send a control signal to the solenoid valve group 230 according to the comparison result;
The solenoid valve group 230 is operated according to the control signal to control the amount or speed of expansion and contraction of the air spring assembly (1313 or 1322) of the suspension 130 and/or the air spring 144 and the air cylinder 143 of the rear lift bridge assembly 140, thereby controlling the elevation height or elevation speed of the chassis frame or the rear lift bridge.
In this embodiment, the air compressor 210, the air cylinder 220, the solenoid valve bank 230, the detection unit 240, and the ECU control unit 250 are mounted on the chassis skeleton 110, and the weights of the air compressor 210, the air cylinder 220, the solenoid valve bank 230, the detection unit 240, and the ECU control unit 250 are known, when a counterweight object needs to be placed on the support frame 112, if the weights of the air compressor 210, the air cylinder 220, the solenoid valve bank 230, the detection unit 240, and the ECU control unit 250 have a large influence on the mass of the counterweight object, the mass of the above devices is counted into the mass of the counterweight object; if the weight of the air compressor 210, the gas cylinder 220, the solenoid valve group 230, the detection unit 240, and the ECU control unit 250 has less influence on the mass of the counterweighted object, it is unnecessary to take the mass of the above-mentioned devices into account.
In one implementation of the present invention, air suspension system functional test system 200 further includes a wireless communication module 260 and a remote controller 270, remote controller 270 being in data communication with ECU control unit 250 via wireless communication module 260; the wireless communication module 260 is configured to receive a control signal sent from the remote controller 270, and send the control signal to the ECU control unit 250. The wireless communication module 260 includes an NB-IoT module, an RF wireless module, a WiFi module, a bluetooth module, or a zigbee module, etc.
In one embodiment of the present invention, the air suspension system functional test system 200 further includes a display screen 280, where the display screen 280 is connected to the ECU control unit 250, and is configured to display the status and operating parameters of each device in the air suspension system functional test system. In practical application, a remote controller can be utilized to send control instructions to, for example, calibration control instructions, and states and operation parameters in each period in the air suspension system function test system are displayed on a display screen 280, so that the problem that technical research and development personnel only can manually cooperate with a plurality of people to cause time and labor waste when the air suspension system is calibrated is solved, and the labor cost of the tester is reduced. When the air suspension system function test system is applied to the teaching field, students can intuitively see states and operation parameters in various periods in the air suspension system function test system.
In summary, according to the technical scheme provided by the invention, the chassis framework is designed, and the wheels are installed and fixed on the chassis framework through the suspension device, so that the motion states of the vehicle body, the suspension device and the wheels when the vehicle runs on different roads can be dynamically simulated, the control strategy of the air suspension system can be optimized according to the motion state parameters of the vehicle body, the suspension device and the wheels, and the performance of the air suspension system can be improved. The functional test bench of the air suspension system can be applied to a technical research and development stage, is convenient for technical research and development personnel to optimize the control strategy of the air suspension system, and outputs high-quality research and development results; the air suspension system can also be applied to the experimental teaching stage, so that teachers can dynamically demonstrate the structural composition and working process of the air suspension system, and the understanding and operation ability of students are enhanced. In addition, the length and the height of the chassis framework are adjustable, so that the vehicle type state of different wheelbases and wheelbase can be simulated, and the suspension devices with different forms and different strokes can be installed, so that the air suspension system function test bench is not only suitable for the air suspension system function test of a passenger vehicle, but also suitable for the air suspension system function test of a commercial vehicle, and has a wide application range.
Finally, it should be noted that the foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, but the present invention has been described in detail with reference to the foregoing embodiments, and those skilled in the art may modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a commercial car air suspension system functional test rack which characterized in that, this test rack includes chassis skeleton, wheel, linkage and rear lift bridge assembly; the wheels are arranged on the chassis framework through the suspension device; the rear lifting bridge assembly is connected with the chassis framework;
The chassis framework comprises at least two U-shaped portal frames, a supporting frame and a plurality of connecting rods; the upright posts between the U-shaped portal frames are detachably connected through at least one connecting rod; the support frame is vertically connected with the upright post of the U-shaped portal frame and extends towards the direction of the wheels; the suspension device is arranged on the chassis framework through the connecting rod and the supporting frame; the upright post of the U-shaped portal frame is in sliding connection with the connecting rod; the support frame is slidably connected with the upright post of the U-shaped portal frame;
The rear lifting bridge assembly comprises a rear lifting bridge bracket, a lifting bridge, at least one cylinder and two air springs; the air springs are symmetrically arranged on two sides of the air cylinder, one end of each air spring is connected with the rear lifting bridge bracket, and the other end of each air spring is connected with the lifting bridge; one end of the air cylinder is connected with the rear lifting bridge support, and the other end of the air cylinder is connected with the lifting bridge.
2. The air suspension system functional test bench of claim 1 wherein said U-shaped portal frame, said connecting rod and said support frame comprise a chute structure.
3. The air suspension system function test stand of claim 1, wherein the support frame is provided with a transverse connection rod or a longitudinal connection rod corresponding to the corresponding position of the suspension device.
4. The air suspension system functional test bench of claim 1 wherein said U-shaped portal frame, said connecting rod and said support frame include telescoping adjustment structures.
5. The air suspension system functional test bench of claim 1 wherein said support frame is adapted to carry a weighted object.
6. A commercial vehicle air suspension system function test system, characterized in that the test system comprises at least one air compressor, a gas cylinder, a solenoid valve group, a detection unit, an ECU control unit and the air suspension system function test bench according to any of claims 1-5; the air compressor is connected with the air spring assembly of the suspension device and/or the air spring and the air cylinder of the rear lifting bridge assembly sequentially through the air storage bottle, the electromagnetic valve group;
the air spring assembly, the air spring and the air cylinder are correspondingly provided with the detection unit; each ECU control unit is connected with the corresponding detection unit and the corresponding electromagnetic valve group;
The detection unit is used for detecting the height information of the chassis framework and/or the height information of the rear lifting bridge assembly, and sending the height information to the ECU control unit; and pressure information for detecting the air spring assembly, the air spring and the cylinder and transmitting the pressure information to an ECU control unit;
The ECU control unit is used for receiving the height information and/or the pressure information sent by the detection unit, comparing the height information and/or the pressure information with corresponding threshold values, and sending control signals to the electromagnetic valve group according to the comparison result;
and the electromagnetic valve group is used for operating according to the control signal and controlling the expansion quantity or expansion speed of the air spring component of the suspension device and/or the air spring and the air cylinder of the rear lifting bridge assembly, so as to control the lifting height or lifting speed of the chassis framework or the rear lifting bridge.
7. The air suspension system functional test system of claim 6 further comprising a wireless communication module and a remote control, said remote control in data communication with said ECU via said wireless communication module;
The wireless communication module is used for receiving the control signal sent by the remote controller and sending the control signal to the ECU.
8. The air suspension system functional test system of claim 6 further comprising a display screen coupled to said ECU for displaying status and operating parameters of each device in the air suspension system functional test system.
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| CN110887678B (en) * | 2019-11-06 | 2021-08-31 | 江苏科技大学 | Hardware-in-loop experimental platform and adjusting method of electric control air suspension vehicle height adjusting system |
| CN111735617A (en) * | 2020-06-03 | 2020-10-02 | 拾音汽车科技（上海）有限公司 | Chassis attachment point force test bench |
| CN113295438B (en) * | 2021-05-07 | 2023-05-16 | 中国第一汽车股份有限公司 | Test system and test method for endurance test of air suspension air bag |
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