A method, system and device for fatigue testing of an active suspension system

Abstract

The application provides a fatigue test method, system and device of an active suspension system, and relates to the technical field of fatigue tests.The method comprises the following steps: obtaining a whole vehicle load and a displacement signal;obtaining a fatigue test load, a displacement cycle condition and a temperature cycle condition according to the obtained whole vehicle load and displacement signal;merging the fatigue test load, displacement cycle condition and temperature cycle condition to obtain an active suspension system fatigue test condition; and performing an active suspension system fatigue test according to the active suspension system fatigue test condition.The application can improve the accuracy of the fatigue test of the active suspension system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fatigue test, in particular to a fatigue test method, system and device of active suspension system. BACKGROUND

[0002] The active suspension system can dynamically self-adapt according to the driving conditions of the automobile, and the state signals of the automobile body collected by various sensors are transmitted to the control unit ECU, and the ECU issues corresponding instructions according to the control strategy, drives the electromagnetic valves of the air supply unit and the shock absorber to act, and controls the horizontal movement of the automobile body, so as to achieve the purpose of actively adjusting the suspension stiffness and the softness of the shock absorber.

[0003] In order to ensure the reliability of the active suspension system, the durability of the active suspension system must be checked by fatigue test, however, the fatigue test method of the 1 / 2 suspension system in the prior art is generally carried out at room temperature, and the influence of environmental stress on the air spring parts is ignored, the checking dimension is not comprehensive, and the fatigue test accuracy is low. SUMMARY

[0004] In order to solve the defects of the prior art, the purpose of the present application is to provide a fatigue test method, system and device of active suspension system, which introduces environmental factors in the fatigue test of 1 / 2 suspension system, so as to improve the accuracy of fatigue test of active suspension system.

[0005] In order to achieve the above purpose, according to some embodiments, the first aspect of the present application provides a fatigue test method of active suspension system, comprising:

[0006] Obtaining the whole vehicle load and displacement signals;

[0007] According to the obtained whole vehicle load and displacement signals, obtaining the fatigue test load, displacement cycle working condition;

[0008] Obtaining the fatigue test temperature cycle working condition;

[0009] Combining the fatigue test load, displacement cycle working condition and temperature cycle working condition to obtain the fatigue test working condition of active suspension system;

[0010] According to the fatigue test working condition of active suspension system, the fatigue test of active suspension system is carried out.

[0011] The second aspect of the present application provides a fatigue test system of active suspension system, comprising:

[0012] The signal acquisition module is configured to obtain the whole vehicle load and displacement signals;

[0013] The fatigue test cycle condition acquisition module is configured to acquire fatigue test load and displacement cycle conditions according to the acquired vehicle load and displacement signals.

[0014] The temperature cycle condition acquisition module is configured to acquire fatigue test temperature cycle conditions.

[0015] The fatigue test condition acquisition module is configured to combine the fatigue test load and displacement cycle conditions and the temperature cycle conditions to obtain the fatigue test conditions of the active suspension system.

[0016] The test module is configured to perform the fatigue test of the active suspension system according to the fatigue test conditions of the active suspension system.

[0017] In a third aspect, the present application provides an electronic device comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to complete the steps of the fatigue test method of the active suspension system.

[0018] In a fourth aspect, the present application provides a computer readable storage medium for storing computer instructions, wherein the computer instructions are executed by a processor to complete the steps of the fatigue test method of the active suspension system.

[0019] In a fifth aspect, the present application provides a computer program product comprising computer program / instructions, wherein the computer program / instructions are executed by a processor to complete the steps of the fatigue test method of the active suspension system.

[0020] In a sixth aspect, the present application provides a fatigue test device of an active suspension system, comprising:

[0021] A gantry is provided with an adjustable mounting beam in height;

[0022] An environmental box is arranged below the gantry, and the box body of the environmental box is detachable;

[0023] A mounting frame comprises a first clamp for fixing a mounting point of an active suspension sub-frame and a second clamp for fixing a mounting point of an air spring assembly, and the mounting frame is fixed on a mounting platform and arranged in the environmental box through the mounting platform;

[0024] A servo device comprises an output end and a fixing assembly, the output end is capable of reciprocating linear motion for performing the fatigue test of the active suspension system, and the fixing assembly is capable of fixing the output end on the bottom of the environmental box or the mounting beam.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] The application provides a fatigue test method, system and device for an active suspension system, wherein, in addition to the vibration influence of the air spring bag of the active suspension system, the fatigue life of the active suspension system is also affected by temperature, an environmental factor, i.e., temperature, is introduced in the fatigue test of the 1 / 2 suspension system, the test temperature cycle working condition is determined according to the air spring, and is combined with the fatigue test cycle working condition to obtain the fatigue test working condition of the active suspension system, fatigue test is carried out based on the test working condition, the real stress state of the active suspension system under various characteristic road conditions and the actual user use environment can be simulated more accurately, and the purpose of checking the fatigue performance of the active suspension system structure is achieved.

[0027] Advantages of the additional aspects of the application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein by reference. The illustrations are shown for the purpose of enabling those skilled in the art to

[0029] Figure 1 The schematic diagram of the method of the application is shown in the figure;

[0030] Figure 2 The schematic diagram of the overall structure of the active suspension system fatigue test device is shown in the figure;

[0031] Figure 3 The schematic diagram of the installation of the active suspension system is shown in the figure;

[0032] Figure 4 The schematic diagram of the structure of the first clamp is shown in the figure;

[0033] Figure 5 The schematic diagram of the structure of the second clamp is shown in the figure;

[0034] Figure 6 The schematic diagram of the structure of the loading rack is shown in the figure;

[0035] Figure 7 The schematic diagram of the structure of the environmental box is shown in the figure;

[0036] Figure 8 The schematic diagram of the structure of the fixed box body is shown in the figure;

[0037] Figure 9 The schematic diagram of the structure of the movable box body is shown in the figure;

[0038] Figure 10 The schematic diagram of the structure of the support rack is shown in the figure;

[0039] Figure 11 The schematic diagram of the structure of the temperature insulation box is shown in the figure;

[0040] Figure 12 Structure diagram of the placing rack;

[0041] Figure 13 Structure diagram of the fixed rack, transition rack and iron floor connection;

[0042] Figure 14 Structure diagram of the fixed rack;

[0043] Figure 15 Structure diagram of the transition rack;

[0044] Figure 16 Structure diagram of the transition platform;

[0045] Figure 17 Structure diagram of the movable device;

[0046] Figure 18 Structure diagram of the hanging rack;

[0047] Figure 19 Structure diagram of the active suspension system;

[0048] Figure 20 Structure diagram of the third clamp;

[0049] Figure 21 Structure diagram of the fourth clamp;

[0050] Figure 22 Structure diagram of the sliding bearing;

[0051] Wherein, 100, the active suspension system; 111, the first clamp; 1111, the boss type threaded hole; 1112, the square tube beam; 1113, the flat clamp; 112, the second clamp; 120, the DAFA platform; 130, the loading rack; 131, the flat plate; 132, the loading hole; 140, the servo equipment; 141, the fixed assembly; 142, the output end; 143, the extension rod; 1431, the third clamp; 1432, the fourth clamp; 150, the environmental box; 1501, the movable box body; 1511, the observation window; 1512, the beam support lug; 1513, the lifting lug; 1502, the fixed box body; 1521, the support frame; 1522, the temperature insulation box; 1503, the placing rack; 1531, the sliding bearing; 1504, the fixed rack; 1505, the transition rack; 160, the transition platform; 1601, the upper plate; 1602, the bottom plate; 170, the movable device; 180, the hanging rack; 1811, the beam; 1812, the support vertical beam; 1813, the distance adjusting mechanism; 190, the gantry; 191, the mounting beam; 900, the iron floor; 1000, the active suspension system fatigue test device. DETAILED DESCRIPTION

[0052] The application will be further described below in conjunction with the drawings and examples.

[0053] Embodiment one

[0054] As Figure 1 shown, a fatigue test method of an active suspension system comprises:

[0055] S1, obtaining a vehicle load and a displacement signal;

[0056] S2, obtaining a fatigue test load, displacement cycle condition according to the obtained vehicle load and displacement signal;

[0057] S3, obtaining a fatigue test temperature cycle condition;

[0058] S4, merging the fatigue test load, displacement cycle condition and the temperature cycle condition to obtain an active suspension system fatigue test condition;

[0059] S5, performing an active suspension system fatigue test according to the active suspension system fatigue test condition.

[0060] In step S1, the load at the wheel center of the vehicle and the displacement stroke of the suspension vertical movement are obtained, the active suspension system is assembled on the test vehicle, and the wheel center load and the suspension vertical movement stroke are obtained through the data acquisition system according to the vehicle test field road test specification. In some embodiments, step S1 specifically comprises:

[0061] S11, setting a force sensor for collecting the load at the wheel center on the wheel of the test vehicle, mainly collecting the six-component force load at the wheel center, including the longitudinal force F x , the lateral force F y , the vertical force F z , the rotational torque M x , M y , M z , and the force sensor can be a six-component force sensor at the wheel center.

[0062] S12, setting a displacement sensor for detecting the suspension movement stroke data on the suspension (the active suspension to be tested) of the test vehicle, and the displacement sensor can be a wire displacement sensor.

[0063] S13, carrying out road load spectrum collection work to obtain the vehicle load and displacement signal.

[0064] In step S2, in order to accelerate the verification process, the wheel center load random spectrum and the suspension vertical movement stroke random spectrum collected in step S1 are converted into Block multi-stage constant amplitude vibration load and displacement at the wheel center loading of the active suspension system and the corresponding fatigue test cycle period according to the reliability acceleration model. In some embodiments, step S2 comprises:

[0065] S21, select a reliability acceleration model. The reliability acceleration model should be selected according to the product structure and influence stress factors, and in this embodiment, the vibration type reliability acceleration model can select the inverse power law model based on the S-N fatigue curve;

[0066] S22, according to the S-N vibration curve and the damage equivalent principle, the random spectrum (Random) is converted into a Block multi-level constant amplitude spectrum. The X and Y direction Block multi-level constant amplitude fatigue vibration load and vibration cycle number are converted from the wheel core six-component random time domain load, and the Z direction Block multi-level constant amplitude fatigue vibration displacement and vibration cycle number are converted from the random time domain signal collected by the displacement sensor arranged at the wheel core. The random spectrum (Random) is converted into a Block multi-level constant amplitude spectrum, based on the S-N curve and rain flow counting statistics, the cumulative damage is calculated, based on the damage equivalent principle, the converted damage is equivalent to the cumulative damage of the target sum before conversion, and finally the converted Block multi-level constant amplitude spectrum is obtained. The obtained Block multi-level constant amplitude spectrum can be input into the test bench control system to obtain the fatigue test load, displacement cycle working condition, so as to perform the fatigue test.

[0067] In step S3, the environmental factors are introduced in the fatigue test, which can simulate the real user environment of the active suspension system. The bladder of the air spring in the active suspension system is a rubber part, and in addition to the influence of vibration, its fatigue life is also affected by temperature. The test temperature of the active suspension system is mainly determined according to the user use temperature set by the air spring, and the user use temperature of the air spring is generally set to -40℃-80℃; the temperature cycle is determined according to the general user life promised by the host factory, and the host factory generally promises the user life of 10 years. According to the temperature alternating reliability acceleration model, the test temperature cycle of the active suspension system is calculated, and in this embodiment, the Coffin-Manson temperature acceleration model is selected as the temperature alternating reliability acceleration model. The Coffin-Manson temperature acceleration model is suitable for the acceleration model of temperature impact test, and reflects the fatigue failure under the action of temperature alternating stress. In the acceleration model, the temperature changes twice a day in most areas in China, and the average temperature is 20℃; the temperature change rate is determined according to the equipment itself capacity, such as the lifting rate of the environmental box equipment is 2℃ / min.

[0068] After the above parameters are confirmed, the test time is calculated according to the Coffin-Manson temperature acceleration model. In the Coffin-Manson temperature acceleration model, the acceleration factor where, ΔT Test is the difference between the high and low temperatures of the test cycle, ΔT Feld is the average temperature change, and the fatigue cycle number Wherein N is the total number of cycles, combined with the above parameters, the total temperature cycle period (i.e. total test time) can be calculated. According to the active suspension life temperature design requirements, the main average temperature points used by the user are selected, such as normal temperature (20±3) ℃, high temperature (38±3) ℃, high humidity 95%, extreme low temperature-40℃, etc. According to the calculated total test time, the test time at each temperature point is designed, and the fatigue test temperature cycle working condition is obtained. Taking the parameters given above as an example, the total test time design process is shown in Table 1.

[0069] Table 1 Total test time calculation process

[0070]

[0071]

[0072] In step S4, according to the Miner fatigue damage equivalent criterion, the load and displacement cycle working condition obtained in S2 is combined and corrected with the fatigue test temperature cycle working condition obtained in S3 to design the active suspension system X, Y and Z direction loading fatigue test working condition. The X and Y direction vibration loading of the active suspension system is controlled by a force sensor, and the Z direction vibration loading is controlled by a displacement sensor. Generally, the X, Y and Z directions comply with the Cartesian coordinate system. According to the total test time obtained in S3, the temperature proportion of the X, Y and Z direction loading is evenly distributed. The load and displacement cycle times are loaded according to the frequency 1Hz, and then the X, Y and Z direction loading fatigue cycle times can be corrected according to the rounding method.

[0073] In step S5, according to the active suspension system fatigue test working condition obtained in S4, the active suspension system is installed on the test device to perform fatigue test. In this embodiment, the active suspension system to be tested is a 1 / 2 suspension system. Compared with the commonly used 1 / 4 suspension system for durability performance test of air spring components, the durability performance of other components of the active suspension system (such as auxiliary frame, control arm, etc.) can be comprehensively tested, which is closer to the actual application scene. Compared with the ordinary 1 / 2 suspension system fatigue test at normal temperature, the influence of environmental stress on air spring components is considered, which improves the accuracy of fatigue test.

[0074] Embodiment two

[0075] Based on the method provided in embodiment one, this embodiment further provides an active suspension system fatigue test system, comprising:

[0076] A signal acquisition module configured to acquire vehicle load and displacement signals;

[0077] A fatigue test cycle working condition acquisition module configured to acquire fatigue test load and displacement cycle working conditions according to the acquired vehicle load and displacement signals;

[0078] The temperature cycle condition acquisition module is configured to acquire a fatigue test temperature cycle condition.

[0079] The fatigue test condition acquisition module is configured to combine the fatigue test load, displacement cycle condition and temperature cycle condition to obtain the fatigue test condition of the active suspension system.

[0080] The test module is configured to perform the fatigue test of the active suspension system according to the fatigue test condition of the active suspension system.

[0081] The system in the embodiment corresponds to the steps of the method of the active suspension system fatigue test provided in the first embodiment, and will not be described here.

[0082] Embodiment three

[0083] The embodiment provides an electronic device, which includes a memory, a processor and a computer program stored in the memory, and the processor executes the computer program to complete the steps of the method in the first embodiment.

[0084] Embodiment four

[0085] The embodiment provides a computer readable storage medium for storing computer instructions, and the computer instructions are executed by a processor to complete the steps of the method in the first embodiment.

[0086] Embodiment five

[0087] The embodiment provides a computer program product, which includes computer programs / instructions, and the computer programs / instructions are executed by a processor to realize the steps of the method in the first embodiment.

[0088] Embodiment six

[0089] The embodiment provides an active suspension system fatigue test device for the fatigue test of the active suspension system in the first embodiment. As shown in the figure, the active suspension system fatigue test device 1000 provided by the embodiment includes: Figures 2-22

[0090] The gantry 190 is provided with an installation beam 191 with adjustable height, which is used to fix the servo device 140 when performing Z-direction loading.

[0091] The environmental box 150 is arranged below the gantry 190, and the box body of the environmental box 150 can be opened and closed.

[0092] ​The mounting rack includes a first clamp 111 for fixing the active suspension sub-frame mounting point and a second clamp 112 for fixing the air spring assembly mounting point. The mounting rack is fixed to the mounting platform, which is arranged in the environmental chamber 150. In this embodiment, the mounting platform is a DAFA platform 120 provided by MTS.

[0093] The servo device 140 includes an output end 142 capable of reciprocating linear motion for active suspension system fatigue test and a fixing assembly 141 capable of fixing the output end to the bottom of the environmental chamber or the mounting beam 191. The fixing assembly 141 includes a third clamp 1431 for vertically mounting the output end on the mounting beam and a fourth clamp 1432 for horizontally fixing the output end on the iron floor 900. Different clamps are selected for installation according to different experiments and installation requirements to fix the servo device and apply load to the active suspension system. The end of the output end 142 not connected to the fixing assembly 141 is also connected to an extension rod 143, which can adjust the distance according to the suspension height and is used to connect the active suspension system wheel hub loading rack 130.

[0094] As shown in Figure 4 , the first clamp 111 is designed with three boss type threaded holes 1111 according to the sub-frame mounting point structure. The main body is a lightweight and universal square tube beam 1112, the ends of which are welded with flat clamps 1113. The flat clamps 1113 are designed with four through holes according to the DAFA platform 120 provided by MTS. The DAFA platform 120 is a universal fixing tool, which can design internal tools according to the mounting points of different suspension systems.

[0095] As shown in Figure 5 , the second clamp 112 is designed in a tailor-welded manner. Three flat plates are arranged in a space structure according to the suspension fixing point position. One side of the first flat plate is attached to the second flat plate, and through holes are formed in the corresponding positions of the two. The third flat plate is out of plane with the first flat plate and the second flat plate, and is provided with two lug bracket structures simulating the body mounting point, which is lightweight and universal.

[0096] As shown in Figure 6 , the loading rack 130 is used to fix the steering knuckle position of the active suspension system and is provided with three loading holes at the upper, lower and one side to realize X, Y and Z loading movements of the active suspension system. The loading rack 130 is designed in a tailor-welded manner, and the main body is composed of two flat plates 131, which are hollow in the middle and lightweight. The three loading holes 132 are designed in a lug type structure, and the loading holes are separately processed and then welded on the two flat plates. One of the flat plates is provided with a threaded through hole according to the mounting point of the active suspension steering knuckle, which is convenient for connection, and the loading rack 130 is universal and lightweight.

[0097] AsFigure 2 , Figures 7-15 As shown, the environment chamber 150 is detachable and includes a movable chamber 1501 and a fixed chamber 1502. A shelf 1503 is placed outside the environment chamber 150 to hold the movable chamber 1501. The fixed chamber 1502 has a fixed frame 1504 at its bottom, and a transition frame 1505 at its lower part. The environment chamber has a small door and an observation window, and multiple square holes. A support frame 1521 is embedded in the chamber below the square holes. A sliding bearing 1531 is mounted on the support frame 1521, which can move on the support frame 1521 to guide the load on the output terminal 142 of the servo device 140. The fixed frame 1504 is placed inside the environment chamber, and its surface has a through T-slot and a T-hole. The transition frame 1505 is designed with multiple mounting holes. The transition frame 1505 is embedded in the bottom surface of the fixed box 1502 and is placed between the fixed frame 1504 and the iron floor 900 at the bottom of the environmental box 150.

[0098] The fixed housing 1502 has a polygonal cross-section for easy access to the DAFA platform 120. Multiple latches are fixed at appropriate locations along the cross-section to close the movable housing 1501. The fixed housing 1502 has two square through-holes on its front, left, right, and top surfaces. The extension rod 143 of the servo device 140 can enter through these square through-holes and connect to the loading hole of the loading frame 130, enabling simultaneous loading from both sides. A support frame 1521 is installed below the square through-holes to support the sliding bearing. The support frame 1521 is a frame structure composed of multiple beams, with threaded through-holes on the main horizontal and vertical beams for easy adjustment of the sliding bearing distance. A round hole is located at the bottom of the fixed housing 1502, and a transition frame 1505 is embedded in the bottom of the fixed housing 1502, with its top flush with the round hole. A heat-insulating box 1522 is located at the square through-hole on the top surface of the fixed housing 1502 to ensure that the force sensor at the output end 142 is kept at room temperature. The insulated box 1522 has a rectangular hollow structure with an internal insulation layer and a sealing rain cloth on the bottom. The sealing rain cloth is softly connected and tied to the extension rod 143 by clamps. The top edge of the insulated box 1522 has multiple through holes for fixing to the fixed box body 1502.

[0099] The cross-section of the movable enclosure 1501 matches that of the fixed enclosure 1502 to ensure that they can form a complete environmental enclosure 150 when assembled. The movable enclosure 1501 has an inspection door and observation window 1511 on the front, crossbeam support ears 1512 on the left and right sides, and four lifting ears 1513 on the top. The movable enclosure 1501 is moved using the lifting ears 1513, and the crossbeam support ears 1512 are safely and stably placed on the placement frame 1503. The placement frame 1503 is a frame structure composed of multiple beams, with multiple lifting ears on the top beams for easy hoisting of the entire placement frame 1503.

[0100] The mounting bracket 1504 has a cuboid structure with four through T-slots along its length for securing the DAFA platform 120. Additionally, the mounting bracket 1504 has 12 T-shaped internal holes in three rows for connecting the transition bracket 1505.

[0101] There are four sets of transition frames 1505, the number matching the T-shaped inner holes of the fixed frames 1504. They are embedded within the fixed housing 1502 and serve as a transition connection between the fixed frames 1504 and the metal floor 900. The transition frames 1505 have a T-shaped structure, consisting of three cylindrical bosses and a flat plate connected to the bottom of the cylindrical bosses. The top of the bosses has threaded holes for bolting the fixed frames 1504. The flat plate has through holes for bolting the metal floor 900. The transition frames 1505 ensure that the force of the DAFA platform is directly transferred to the metal floor 900, rather than directly to the fixed housing 1502, thus ensuring the service life of the environmental enclosure 150.

[0102] like Figure 16 As shown, it also includes a transition platform 160. The transition platform 160 has a general rectangular structure, and its total height is the same as the spatial height of the fixed frame 1504. The transition platform 160 consists of two flat plates. The top plate 1601 has multiple lifting lugs on its top surface for easy hoisting and movement. Its thickness is the same as that of the fixed frame 1504 and it can extend into the environmental enclosure 150, forming a single plane with the fixed frame 1504. The bottom plate 1602 is a frame structure with the same thickness as the transition frame 1505. The transition platform 160 is used to transport the DAFA platform 120.

[0103] like Figure 17 As shown, it also includes a movable device 170, which is placed between the DAFA platform 120 provided by MTS and the fixed frame 1504, facilitating the movement of the DAFA platform 120 to the loading position required for the test. The movable device 170 has a tank-like structure with casters at the bottom, an adjustable bearing surface, strong load-bearing capacity, and is easy to handle.

[0104] The environmental enclosure 150 is also equipped with a hanging rack 180, such as Figure 18 As shown, the hanger 180 consists of two supporting vertical beams 1812, one horizontal beam 1811, and two adjustable distance mechanisms 1813 placed on the horizontal beam that can be vertically adjusted. The adjustable distance mechanism 1813 is preferably a hoist device with a chain. The adjustable distance mechanism 1813 can be connected to the lifting lug of the loading frame 130 through a rod or chain-type connecting mechanism. The bottom of the supporting vertical beams 1812 is provided with pulleys to facilitate the movement of the hanger 180.

[0105] In use, the active suspension system 100 is mounted on the DAFA platform 120 provided by the MTS through the mounting bracket, and then the DAFA platform 120 is hoisted as a whole and fixed to the fixing bracket 1504 in the environmental box 150. The loading bracket 130 is fixedly installed at the knuckle position of the active suspension system 100, one end of the extension rod 143 is connected to the loading bracket 130, and the other end is connected to the output end of the servo device 140. After installation, the test program is designed according to the test method provided in Embodiment 1, and is input to the servo device 140 and the environmental box 150. The servo device 140 and the environmental box 150 are started to carry out the fatigue test, and the test process is monitored. If the active suspension system is loaded in the X direction and the Y direction, the hanger 180 in the box is used to connect the loading clamp to ensure that the active suspension system 100 meets the height requirement under different loadings, and the two servo devices 140 are fixed horizontally on the iron floor 900. If the active suspension system 100 is loaded in the Z direction, the hanger in the box is not needed, and the two servo devices are fixed vertically on the mounting beam 191 of the gantry. The fixed position of the servo device is determined according to the wheelbase and the tire contact position of the vehicle.

[0106] Specifically, when the device is installed, first, the environmental box 150 is hoisted to place the movable box body 1501 on the placing rack 1503 aside, then the transition platform 160 is hoisted horizontally to place outside the small door of the fixed box body 1502 of the environmental box 150, then the movable device 170 is placed on the transition platform 160, then the DAFA platform 120 is hoisted to place on the movable device 170, then the DAFA platform 120 is pushed to the test position in the fixed box body 1502, then the DAFA platform 120 is vertically hoisted by the travelling crane from the small door at the top of the fixed box body 1502, then the movable device 170 is taken out, then the DAFA platform 120 is vertically placed and fixed on the fixed rack 1504 by bolts. If the test condition is the Z-direction loading active suspension system 100, the hanger 180 is not needed, the fixed assembly 141 of the two servo devices 140 is vertically fixed on the mounting beam 191 of the gantry 190, the spatial positions of the two servo devices 140 are determined according to the wheelbase of the vehicle type, then the output end 142 of the two servo devices 140 is connected to the loading rack 130 through the extension rod 143; if the test condition is the X or Y direction loading active suspension system 100, the hanger 180 is needed, the two distance adjusting mechanisms 1813 on the cross beam 1811 of the hanger 180 which can be adjusted along the cross beam are connected to the loading rack 130, the fixed assembly 141 of the two servo devices 140 is horizontally fixed on the iron floor 900 through the fixed support, then the output end 142 of the two servo devices 140 is connected to the loading rack 130 through the extension rod 143. The balance position of the active suspension system 100 is determined according to the vertical wheel center load and the air spring pressure, the vertical wheel center load is adjusted according to the reading of the force sensor of the servo device 140. Finally, the lifting lug 1513 on the movable box body 1501 is hoisted to move the movable box body 1501, and the movable box body 1501 is combined with the fixed box body 1502 to form the whole environmental box 150, and the joint is locked by the lock catch. The servo device 140 and the environmental box 150 are set, and the test is started.

[0107] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fatigue testing method for an active suspension system, characterized in that, include: Acquire vehicle load and displacement signals; Based on the acquired vehicle load and displacement signals, fatigue test load and displacement cycle conditions are obtained. Obtain the temperature cycling conditions for fatigue testing; By combining the fatigue test load, displacement cycle condition, and temperature cycle condition, the fatigue test condition of the active suspension system is obtained. The fatigue test of the active suspension system was conducted according to the fatigue test conditions of the active suspension system. The process of obtaining the fatigue test temperature cycle conditions includes: calculating the fatigue test temperature cycle conditions based on the user's operating environment of the air spring using a temperature alternation reliability acceleration model. The Coffin-Manson temperature acceleration model was selected as the reliability acceleration model for temperature alternation.

2. A fatigue testing system for an active suspension system, characterized in that, include: The signal acquisition module is configured to acquire vehicle load and displacement signals; The fatigue test cycle condition acquisition module is configured to acquire fatigue test load and displacement cycle conditions based on the acquired vehicle load and displacement signals. The temperature cycling condition acquisition module is configured to acquire fatigue test temperature cycling conditions; including: calculating fatigue test temperature cycling conditions based on the user's operating environment of the air spring using a temperature alternation reliability acceleration model; the temperature alternation reliability acceleration model selected is the Coffin-Manson temperature acceleration model; The fatigue test condition acquisition module is configured to combine fatigue test load, displacement cycle condition and temperature cycle condition to obtain the fatigue test condition of the active suspension system. The test module is configured to conduct fatigue tests on the active suspension system based on the fatigue test conditions of the active suspension system.

3. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to perform the steps of the method of claim 1.

4. A computer-readable storage medium, characterized in that, Used to store computer instructions, which, when executed by a processor, complete the steps of the method described in claim 1.

5. A computer program product, comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method of claim 1.

6. A fatigue testing apparatus for an active suspension system, used to implement the fatigue testing method for an active suspension system as described in claim 1, characterized in that, include: A gantry frame, wherein the gantry frame is equipped with height-adjustable mounting beams; An environmental chamber is located below the gantry frame, and the chamber body can be detached and assembled. The mounting bracket includes a first clamp for fixing the mounting point of the active suspension subframe and a second clamp for fixing the mounting point of the air spring assembly. The mounting bracket is fixed to the mounting platform and is placed inside the environmental chamber through the mounting platform. A servo device, comprising an output end and a fixing component, wherein the output end is capable of reciprocating linear motion for performing fatigue tests on an active suspension system, and the fixing component is capable of fixing the output end to the bottom of an environmental chamber or to a mounting beam.

7. The fatigue testing device for an active suspension system as described in claim 6, characterized in that, The environmental chamber is used to adjust the temperature inside the chamber according to the temperature cycle conditions of the fatigue test. It includes a movable chamber and a fixed chamber. The movable chamber and the fixed chamber have matching cross-sectional shapes. The movable chamber and the fixed chamber are locked together by a latch.

8. The fatigue testing device for an active suspension system as described in claim 7, characterized in that, The fixed housing has a through hole for the servo device to pass through, and an insulated box is installed at the through hole to isolate the force sensor on the servo device from the interior of the environmental box.

9. The fatigue testing device for an active suspension system as described in claim 6, characterized in that, It also includes a transition platform and a movable device. The height of the transition platform is the same as the height of the fixed frame at the bottom of the fixed box, and the upper plate of the transition platform can be spliced ​​with the fixed frame to form a plane. The movable device is movably installed at the fixed box and is used to transport the installation platform to a set position inside the fixed box.

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