A multi-road surface simulation function dynamometer device and test method

Abstract

The present invention discloses a multi-road surface simulation function dynamometer device and a test method, comprising a dynamometer platform arranged on the ground, and a frame located below the dynamometer platform, wherein a fixed base and a sliding base are sequentially arranged on the inner side of the frame along the length direction of the dynamometer platform, a dynamometer hub is respectively mounted on the fixed base and the sliding base via a plurality of support frames, a plurality of mounting holes are arrayed on the circumferential wall of the dynamometer hub, and the mounting holes are used for connecting and mounting rail steel rings or rubber undulating plates; the dynamometer can perform dynamometer tests on rail vehicles, wheeled vehicles and even tracked vehicles, and can also simulate conditions such as wavy roads, uneven roads, dry roads, roads with different adhesion coefficients, and slippery roads, thereby greatly improving the flexibility and applicability of the dynamometer.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle dynamometers, and in particular to a multi-road surface simulation function dynamometer device and a test method. Background Art

[0002] A chassis dynamometer is an indoor test bench used to test the dynamics, multi-operational emissions, fuel efficiency, and all-electric range of automobiles and construction vehicles. Using a roller to simulate the road surface, the chassis dynamometer calculates road simulation equations and uses a loading device to accurately simulate various operating conditions. It can be used for loading and debugging automobiles and construction vehicles and diagnosing vehicle faults under load. The chassis dynamometer is easy to use, reliable, and unaffected by external conditions. Without disassembling the vehicle, it can accurately and quickly test the performance of various systems and components. Chassis dynamometers are used for both scientific automotive testing and maintenance inspections.

[0003] The Chinese invention patent application (publication number: CN112985659A) disclosed in 2021 a heavy-load, high-power, high-torque chassis dynamometer under a multi-environment system. The dynamometer can adapt to chassis dynamometer tests of different heavy-load trucks, can test multiple sets of front wheels, and can test the front and rear wheels synchronously or asynchronously. However, the hub can only test wheeled vehicles and is not compatible with rail vehicles. It also has limitations for testing on wet and slippery roads and uneven and undulating roads. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-road surface simulation function dynamometer device and a test method to address the problems existing in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A multi-road surface simulation function dynamometer device comprises a dynamometer platform arranged on the ground, and a frame located below the dynamometer platform, wherein a fixed base and a sliding base are sequentially arranged on the inner side of the frame along the length direction of the dynamometer platform, and a dynamometer hub is respectively mounted on the fixed base and the sliding base through a plurality of support frames, and a plurality of mounting holes are arrayed on the circumferential wall of the dynamometer hub, and the mounting holes are used to connect and mount rail steel rings or rubber undulating plates or road surface component panels with different adhesion coefficients; the rail steel rings are arranged in pairs, and each pair of the rail steel rings is respectively arranged on the dynamometer hubs arranged synchronously in opposite directions; the rubber undulating plates are arranged in an axially spaced manner The dynamometer hub is provided with a plurality of blocks, the inner surface of the rubber undulating plate is in close contact with the outer surface of the dynamometer hub, and the outer surface of the rubber undulating plate is arc-shaped and has a plurality of wave grooves parallel to the axis direction; the dynamometer platform is further provided with a plurality of water spray assemblies on one side of the dynamometer hub, and the water spray assemblies are used to wet the dynamometer hub and / or the rubber undulating plate (or road surface assembly panels with different adhesion coefficients) to simulate a wet and slippery state; the periphery of the dynamometer hub is further provided with a water retaining assembly, and the water retaining assembly is detachably mounted on the fixed base and the sliding base, and the water retaining assembly covers the peripheral part of the dynamometer hub located below the dynamometer platform from the outer periphery.

[0007] The dynamometer uses a direct-drive motor to independently drive four rotating hubs for full-vehicle road simulation testing. The hubs provide the test vehicle with precise simulated loads or various road test conditions. The equipment is installed in a pit and covered with insulated steel plates. The dynamometer control system simulates road loads using speed and torque, ensuring the test vehicle achieves the same performance as on a proving ground or on real roads. Dynamometer hub control methods include independent four-hub control, synchronous coaxial hub control, synchronous front / rear hub control, and coaxial hub differential control. Dynamometer motor control modes include constant speed, constant force, constant power, and road resistance. The control system, serving as the primary data acquisition and computational component, reads all dynamometer parameters in real time and can record and calculate all parameters required for testing. The full data system also provides complete traceability of all operating states and data of the dynamometer system. Based on the heavy-load, high-power and high-torque characteristics of the original dynamometer, this dynamometer further improves the structure of the dynamometer hub, making it capable of performing dynamometer tests on rail vehicles, wheeled vehicles and even tracked vehicles, and can also simulate conditions such as wavy roads, uneven roads, dry roads, roads with different adhesion coefficients, and slippery roads. The flexibility and applicability of the dynamometer are greatly improved.

[0008] Moreover, this improvement does not require changes to the main structure and control system of the original dynamometer. It only requires improvements to the original dynamometer hub, and multiple circles of mounting holes are arranged at equal intervals above it. Different components are installed on the periphery of the dynamometer hub to simulate track pavement, undulating pavement, and uneven pavement, and the function of simulating slippery pavement is simulated by controlling the water spray component. Depending on the test vehicle and test conditions, the rail steel ring or the rubber undulating plate is installed on the dynamometer hub to test different vehicles. The simulation of different adhesion coefficient pavement is achieved by replacing the different adhesion coefficient component panels. The spacing, size, and installation position of the rail steel ring and the rubber undulating plate can be adjusted according to the relevant requirements of the test vehicle. Since disassembly and installation are also very convenient, the test layout and preparation are not complicated. Compared with the multi-road condition simulation of other dynamometers, the test efficiency and accuracy of this dynamometer are also higher.

[0009] The setting of the water spray component can spray water in real time according to the test requirements to wet the dynamometer hub and the rubber undulation plate; the setting of the water retaining component can ensure a stable operating environment for the dynamometer operation. Under the condition of not affecting the operation of the dynamometer hub, it can block the water droplets thrown out by the dynamometer hub and collect the water for centralized discharge, so as to avoid the wetting water from flowing into the base and the internal motor of the dynamometer and causing unnecessary faults. Since the dynamometer hub of this dynamometer is still driven by a permanent magnet synchronous motor installed in the hub, waterproofing during operation is more important, and water is prevented from flowing to the base below at will, causing pollution and increasing the difficulty of cleaning. The control of the adhesion coefficient of different road surfaces is achieved by controlling the flow rate of the water spray component.

[0010] The corrugated grooves on the outer surface of the rubber undulation plate provide subtle undulations, modify friction during dry testing, and act as water channels during wet testing, facilitating water flow and dispersion. The corrugated pattern design within the outer axial length period is based on the design of specialized pavement surfaces at test sites. The phase difference between the left and right wheels can be adjusted as needed, achieved through independent wheel hub control.

[0011] Furthermore, the rail steel ring includes an annular fixing part and a rail part integrally formed with the annular fixing part, the rail part is arranged in the middle of the annular fixing part, and the annular fixing part is sleeved on the dynamometer hub and screwed to the mounting hole.

[0012] Because the pair of dynamometer hubs mounted on the fixed base and the sliding base are spaced apart, the rail ring can be installed in a sleeve-like manner. Screw holes corresponding to the mounting holes are provided on the annular fixing portion to facilitate screw fixation. When testing a rail vehicle, if a slippery condition is desired, water mist can simply be sprayed onto the rail ring to wet the rail, thus avoiding spraying water onto the dynamometer hub.

[0013] Furthermore, the length of a single rubber undulating plate does not exceed the axial length of the dynamometer hub, and a plurality of rubber undulating plates are screwed onto the dynamometer hub at equal intervals and cover all the mounting holes, and each of the rubber undulating plates is provided with a plurality of stepped countersunk holes docked with the mounting holes.

[0014] A plurality of the rubber undulating plates can be assembled at intervals to form an undulating wave road surface. By setting the size of the rubber undulating plates, while using these mounting holes for screw installation, other mounting holes can also be covered to prevent water from entering the inside of the dynamometer hub during wetting.

[0015] The step countersunk hole can accommodate the head of the connecting bolt so that it falls completely into the rubber undulating plate, thereby preventing the connecting bolt from protruding from the surface of the rubber undulating plate and affecting the test effect.

[0016] Furthermore, each of the rubber undulating plates is symmetrically provided with two rows of stepped countersunk holes, and connecting bolts are respectively installed in the stepped countersunk holes. The length of the rubber undulating plate is equal to the axial length of the outer periphery of the dynamometer hub.

[0017] Furthermore, the thickness of the middle portion of the rubber undulating plate is greater than the thickness on both sides of the arc, and the thickness of the middle portion of the rubber undulating plate ranges from 60 to 80 mm; the cross section of a single wave groove is semicircular and is distributed at equal intervals along the outer surface of the rubber undulating plate.

[0018] Furthermore, a hollow channel is provided inside the rubber undulating plate. The hollow channel includes a plurality of main channels and a plurality of branch channels connected to the main channels. The branch channels extend toward the outer surface of the rubber undulating plate and connect to the outside.

[0019] Providing these hollow channels inside the rubber undulating plate can, on the one hand, improve the deformation ability of the rubber undulating plate and enhance its elastic buffering performance. On the other hand, the hollow channels can store a certain amount of water during the wetting process. During the rotation of the dynamometer hub, the water can be temporarily stored in the hollow channels. When the rubber undulating plate is pressed by the wheel, the water can be squeezed out, so that the rubber undulating plate has a good and continuous wetting effect without the need for continuous water spraying. It is more like the state of water being released when a vehicle presses the ground when passing through a muddy road.

[0020] Furthermore, the axial dimension of the water retaining assembly is larger than the axial length of the outer periphery of the dynamometer hub, and the water retaining assembly includes an arc-shaped baffle portion and a water collecting portion, and the baffle portion is symmetrically arranged on both sides of the water collecting portion, and the water collecting portion is located below and is screwed to the fixed base or the sliding base through a set flange edge, and the side wall of the baffle portion is snap-fitted and sealed to the vertical steel plate of the support frame, and the side wall of the baffle portion away from the vertical steel plate is also provided with an inner folding edge, and the upper end of the baffle portion extends out a small section of the dynamometer platform.

[0021] In the setting of pavement components with different adhesion coefficients, component panels with different adhesion coefficients can be selected according to test requirements. Due to the different friction coefficients of the panels, the simulation purpose of different adhesion coefficients can be achieved.

[0022] Furthermore, by using the water spray assembly in conjunction, the adhesion coefficient can be further adjusted within a certain range, thereby testing a larger adhesion coefficient simulation range.

[0023] When the dynamometer hub rotates, the water thrown out or dripping will be blocked and received by the baffle part, and finally flow into the water collecting part (water collecting trough) below, effectively avoiding the problem of water splashing everywhere; in addition to collecting water, the water collecting part can also be directly screwed and fixed on the base below, which is convenient for connection; the side wall of the baffle part is sealed with the vertical steel plate, which can avoid water leakage and fix the baffle part, so that after the connection, the water retaining assembly will not contact the dynamometer hub and will not affect the normal operation of the dynamometer hub; an inner folding edge is provided on the other side wall of the baffle part to prevent water from flowing out of the side wall; the upper end of the baffle part extends out of the dynamometer platform to receive water thrown out from above the dynamometer hub.

[0024] Furthermore, the side wall of the baffle part is provided with a circle of locking protrusions, a circle of sealing rings is embedded on the locking protrusions, and a stepped locking groove is provided on the vertical steel plate. The sealing ring and the locking protrusions are locked together in the stepped locking grooves, and a number of magnetic matching points are also provided between the stepped locking grooves and the side walls on both sides of the locking protrusions.

[0025] Furthermore, the water spray assembly includes a water spray bracket and a rotating nozzle disposed on the water spray bracket, wherein the rotating nozzle is connected to a water pipe, and the water pipe is provided with an electric control valve. The electric control valve is controlled to spray water mist in a quantitative manner.

[0026] Furthermore, a pair of slideways are provided on the dynamometer platform above the sliding base. A pair of water spray brackets are movably disposed within the slideways, and a pair of water spray brackets are screwed to the dynamometer platform above the fixed base. The water spray brackets are configured to be fixed and movable, corresponding to the dynamometer hubs on the fixed base and sliding base, respectively, making water spraying more targeted and timely.

[0027] A test method for a multi-road surface simulation function dynamometer device, the test method comprising simulation and test evaluation of the following road surfaces:

[0028] (1) Rail vehicle simulation test: The rail steel rings are respectively installed on the dynamometer hub, and the rail spacing of the coaxially arranged rail steel rings is adjusted to match the wheel spacing of the rail vehicle to be tested. After the rail steel rings are fixed, the vehicle to be tested is towed or driven onto the rail steel rings, and the dynamometer hub is started to perform a dynamometer test for track measurement; according to the dynamometer control method, the parameters such as the rail vehicle's driving performance, braking performance, and economy can be tested, and the water spray component is started to simulate wet and slippery conditions to conduct a comparative evaluation of the corresponding test data;

[0029] (2) Wave and undulating road simulation test: The rubber undulating plates are installed on the periphery of the dynamometer hub. The rubber undulating plates are arranged at equal intervals on the periphery of the dynamometer hub and the intervals are the same. The number and starting position of the rubber undulating plates on each dynamometer hub are the same. The sliding base is adjusted so that the intervals between the dynamometer hubs at the front and rear positions are the same as the wheelbase of the vehicle under test. The vehicle under test is towed or driven onto the dynamometer hub, and the dynamometer hub is started. Under the action of the rubber undulating plates, the vehicle will move in waves and perform the corresponding dynamometer test. The phase difference of the left and right wheels on the road surface is achieved by separate control of the hub, and a twisted road test can also be simulated.

[0030] (3) Uneven road simulation test: The rubber undulating plates are installed on the periphery of the dynamometer hub. The rubber undulating plates are arranged at unequal intervals on the periphery of the dynamometer hub and at different intervals. The number and starting position of the rubber undulating plates on each dynamometer hub are set differently. The sliding base is adjusted so that the spacing between the dynamometer hubs at the front and rear positions is the same as the wheelbase of the vehicle under test. The vehicle under test is towed or driven onto the dynamometer hub, and the dynamometer hub is started. Under the action of the rubber undulating plates, the vehicle will move unevenly and perform the corresponding dynamometer test.

[0031] (4) Simulation test of road surface with different adhesion coefficients: a road surface component panel with different adhesion coefficients is installed on the periphery of the dynamometer hub. Due to the different friction coefficients of the component panels, the simulation purpose of different adhesion coefficients is achieved. The vehicle to be tested is driven onto the dynamometer hub and the dynamometer hub is started. Under the action of the road surface component panel with different adhesion coefficients, the adhesion coefficient can be further adjusted within a certain range by using a water spray component, thereby testing a larger adhesion coefficient simulation range, and the vehicle is subjected to corresponding tests. The installation method of the road surface component panel with different adhesion coefficients is similar to that of the rubber undulating plate, and is also installed on the periphery of the dynamometer hub by screws or bolts.

[0032] (5) Wet and slippery road simulation test: When the vehicle under test is located on the dynamometer hub, start the water spray assembly to continuously or intermittently spray water onto the rail steel ring or the rubber undulating plate to wet the rail steel ring and the rubber undulating plate. The vehicle under test will change from a dry road simulation condition to a wet and slippery road simulation condition, and the corresponding dynamometer test data will be recorded and analyzed and evaluated.

[0033] Compared with the prior art, the beneficial effects of the present invention are: 1. Based on the heavy load, high power and high torque characteristics of the original dynamometer, the present invention further improves the structure of the dynamometer hub, so that it can perform dynamometer tests on rail vehicles, wheeled vehicles and even tracked vehicles, and can also simulate conditions such as wavy roads, uneven roads, dry roads, roads with different adhesion coefficients, and slippery roads, thereby greatly improving the flexibility and applicability of the dynamometer; 2. This improvement does not require changing the main structure of the original dynamometer, but only requires improving the original dynamometer hub and arranging multiple circles of the mounting holes at equal intervals above it; the spacing, size and mounting position of the rail steel ring and the rubber undulating plate can be adjusted, and since disassembly and installation are also very convenient, the test arrangement and preparation will not be complicated. Compared with the multi-road condition simulation of other dynamometers, the test efficiency and accuracy of the present dynamometer are also higher. ; 3. The setting of the water spray component can spray water in real time according to the test requirements to wet the dynamometer hub and the rubber undulation plate; the setting of the water retaining component can ensure a stable operating environment for the dynamometer operation, and can block the water droplets thrown out by the dynamometer hub and collect the water for centralized discharge without affecting the operation of the dynamometer hub, so as to avoid the wetting water from flowing into the base and the internal motor of the dynamometer and causing unnecessary failures; 4. The wave groove is arranged on the outer surface of the rubber undulation plate, which can provide tiny undulations to change the friction force, and can also be used as a waterway, which is conducive to the flow and dispersion of water; 5. These hollow channels are arranged inside the rubber undulation plate, which can improve the deformation ability of the rubber undulation plate, and can also store a certain amount of water during the wetting process. When the rubber undulation plate is pressed by the wheel, the water can be squeezed out, so that the rubber undulation plate has a better and continuous wetting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall structure of a multi-road surface simulation function dynamometer device of the present invention;

[0035] Figure 2 This is a schematic diagram of the installation of a rail steel ring used in a dynamometer for a railway engineering vehicle according to the present invention;

[0036] Figure 3 for Figure 2 An enlarged schematic diagram of the rail steel ring at point A in the middle;

[0037] Figure 4 The overall structure of a multi-road simulation function dynamometer device of the present invention is shown as follows Figure 2 ;

[0038] Figure 5 Schematic diagram of the three-dimensional structure of the rubber undulating plate of the present invention;

[0039] Figure 6 Schematic diagram of the side structure of the rubber undulating plate of the present invention;

[0040] Figure 7 A schematic diagram of the installation position of the water retaining assembly of the present invention;

[0041] Figure 8 A schematic cross-sectional view of the installation of the water retaining assembly of the present invention;

[0042] Figure 9 This is a schematic structural diagram of the connection between the baffle plate portion and the vertical steel plate of the water retaining assembly of the present invention;

[0043] Figure 10 Schematic diagram of the water spray assembly of the present invention Figure 1 ;

[0044] Figure 11 Schematic diagram of the water spray assembly of the present invention Figure 2 ;

[0045] Figure 12 This is a schematic structural diagram of another rubber undulating plate of the present invention;

[0046] In the figure: 1. Fixed base; 2. Sliding base; 3. Support frame; 301. Vertical steel plate; 4. Dynamometer hub; 5. Mounting hole; 6. Rail steel ring; 601. Annular fixed part; 602. Rail part; 7. Rubber undulating plate; 8. Wave groove; 9. Stepped countersunk hole; 10. Water retaining assembly; 1001. Baffle part; 1002. Water collecting part; 1003. Flange edge; 1004. Protruding part; 11. Sealing ring; 12. Magnetic matching point; 13. Dynamometer platform; 14. Water spraying assembly; 1401. Water spraying bracket; 1402. Rotating nozzle; 15. Slide; 16. Main channel; 17. Branch channel. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] Example 1:

[0050] like Figure 1 and Figure 2 As shown, a multi-road surface simulation function dynamometer device includes a dynamometer platform set on the ground, and a frame located below the dynamometer platform. A fixed base 1 and a sliding base 2 are arranged in sequence on the inner side of the frame along the length direction of the dynamometer platform. A dynamometer hub 4 is respectively installed on the fixed base 1 and the sliding base 2 through a plurality of support frames 3. A plurality of mounting holes 5 are arrayed on the circumferential wall of the dynamometer hub 4, and the mounting holes 5 are used to connect and install rail steel rings 6; the rail steel rings 6 are arranged in pairs, and each pair of the rail steel rings 6 are respectively arranged on the dynamometer hubs 4 that are arranged synchronously in opposite directions.

[0051] Based on the characteristics of heavy load, high power and high torque of the original dynamometer, the dynamometer further improves the structure of the dynamometer hub, so that it can test rail vehicles.

[0052] Further, combined Figure 3As shown, the rail steel ring 6 includes an annular fixing part 601 and a rail part 602 integrally formed with the annular fixing part 601. The rail part 602 is arranged in the middle of the annular fixing part 601. The annular fixing part 601 is sleeved on the dynamometer hub 4 and screwed to the mounting hole 5.

[0053] Because the pair of dynamometer hubs 4 mounted on the fixed base 1 and the sliding base 2 are spaced apart, the rail steel ring 6 can be installed in a sleeve-like manner. Screw holes corresponding to the mounting holes 5 are provided in the annular fixing portion 601 to facilitate screw fixation. When testing a rail vehicle, if a slippery condition is desired, water mist can be sprayed onto the rail steel ring to wet the rail portion, thereby avoiding spraying water onto the dynamometer hub.

[0054] Example 2:

[0055] like Figures 4 to 11 As shown, a dynamometer platform for different working conditions of road surface comprises a dynamometer platform 13 set on the ground, and a frame located below the dynamometer platform 13. A fixed base 1 and a sliding base 2 are sequentially arranged on the inner side of the frame along the length direction of the dynamometer platform. A dynamometer hub 4 is mounted on the fixed base 1 and the sliding base 2 respectively through a plurality of support frames 3. A plurality of mounting holes 5 are arrayed on the circumferential wall of the dynamometer hub 4. The mounting holes 5 are used to connect and install rubber undulating plates 7. The rubber undulating plates 7 are a plurality of pieces arranged at intervals in the axial direction. The inner surface of the rubber undulating plates 7 is in close contact with the dynamometer hub. The outer surface of the hub 4 and the outer surface of the rubber undulating plate 7 are arc-shaped and are provided with a plurality of wave grooves 8 in a direction parallel to the axis; the dynamometer platform 13 is further provided with a plurality of water spray assemblies 14 on one side of the dynamometer hub 4, and the water spray assemblies 14 are used to wet the outer surfaces of the dynamometer hub 4 and the rubber undulating plate 7 to simulate a wet and slippery state; the outer periphery of the dynamometer hub 4 is further provided with a water retaining assembly 10, and the water retaining assembly 10 is detachably mounted on the fixed base 1 and the sliding base 2, respectively, and the water retaining assembly 10 covers the outer peripheral portion of the dynamometer hub 4 located below the dynamometer platform 13 from the outer periphery.

[0056] Based on the heavy-load, high-power and high-torque characteristics of the original dynamometer, this dynamometer further improves the structure of the dynamometer hub 4, so that it can perform dynamometer tests on wheeled vehicles and even tracked vehicles, and can also simulate conditions such as wavy, uneven roads, dry roads, and slippery roads. The flexibility and applicability of the dynamometer are greatly improved.

[0057] Moreover, this improvement does not require changing the main structure of the original dynamometer. It only requires improving the original dynamometer hub and setting multiple circles of the mounting holes 5 at equal intervals above it. According to different test vehicles and test conditions, the rubber undulating plates 7 are installed on the dynamometer hub 4 to achieve testing of different vehicles. The spacing, size and installation position of the rubber undulating plates 7 can be adjusted. Since disassembly and installation are also very convenient, the test layout and preparation will not be complicated. Compared with the multi-road condition simulation of other dynamometers, the test efficiency and accuracy of this dynamometer are also higher.

[0058] The setting of the water spray component 14 can spray water in real time according to the test requirements to wet the dynamometer hub and the rubber undulating plate; the setting of the water retaining component 10 can ensure a stable operating environment for the dynamometer operation. Without affecting the operation of the dynamometer hub, it can block the water droplets thrown out by the dynamometer hub 4 and collect the water for centralized discharge, so as to avoid the wetting water from flowing into the base and the internal motor of the dynamometer, causing unnecessary faults. Since the dynamometer hub of this dynamometer is still driven by a permanent magnet synchronous motor installed in the hub, waterproofing during operation is more important, and water is prevented from flowing onto the base below at will, causing pollution and increasing the difficulty of cleaning.

[0059] The wave groove 8 is provided on the outer surface of the rubber undulating plate 7, which can provide slight undulations on the one hand, and on the other hand can change the friction force during dry testing and be used as a waterway during wet testing, which is beneficial to the flow and dispersion of water.

[0060] Furthermore, the length of a single rubber undulating plate 7 is equivalent to the axial length of the dynamometer hub 4, and multiple rubber undulating plates 7 are screwed on the dynamometer hub 4 at equal intervals and cover all the mounting holes 5. Each rubber undulating plate 7 is provided with multiple stepped countersunk holes 9 that dock with the mounting holes 5.

[0061] A plurality of the rubber undulating plates 7 are assembled at intervals to form an undulating road surface. By setting the size of the rubber undulating plates 7, while utilizing some of the mounting holes for screw installation, other mounting holes can also be covered to prevent water from entering the inside of the dynamometer hub 4 during wetting.

[0062] The step countersunk hole 9 can accommodate the head of the connecting bolt so that it can completely fall into the rubber undulating plate 7, thereby preventing the connecting bolt from protruding from the surface of the rubber undulating plate and affecting the test effect.

[0063] Furthermore, each of the rubber undulating plates 7 is symmetrically provided with two rows of stepped countersunk holes 9 , and connecting bolts are respectively installed in the stepped countersunk holes.

[0064] Furthermore, the thickness of the middle portion of the rubber undulating plate 7 is greater than the thickness on both sides of the arc, and the two sides are symmetrically arranged. The thickness of the middle portion of the rubber undulating plate 7 ranges from 60 to 80 mm, so that a slope is formed on both sides; the cross-section of a single wave groove 8 is semicircular and is distributed at equal intervals along the outer surface of the rubber undulating plate 7.

[0065] Furthermore, the axial dimension of the water retaining assembly 10 is greater than the outer axial length of the dynamometer hub 4. The water retaining assembly 10 includes an arc-shaped baffle portion 1001 and a water collecting portion 1002. The baffle portion 1001 is symmetrically arranged on both sides of the water collecting portion 1002. The water collecting portion 1002 is located below and is screwed to the fixed base 1 or the sliding base 2 through the provided flange edge 1003. The side wall of the baffle portion 1001 is snap-fit ​​and sealed to the vertical steel plate 301 of the support frame 3. The side wall of the baffle portion 1001 away from the vertical steel plate 301 is also provided with an inner folding edge. The upper end of the baffle portion 1001 extends a small section out of the dynamometer platform 13 to form an extended portion 1004.

[0066] The distance between the baffle portion 1001 and the outer periphery of the dynamometer hub 4 gradually increases downwards. The water collecting portion 1002 is a water trough structure and is provided with a discharge outlet with a valve. The collected water can be circulated to the water spray assembly through a water pipe for reuse.

[0067] When the dynamometer hub 4 rotates, the water thrown out or dripping will be blocked and received by the baffle part 1001, and finally flow into the water collecting part 1002 below, effectively avoiding the problem of water splashing everywhere; in addition to collecting water, the water collecting part 1002 can also be directly screwed and fixed on the base below for easy connection; the side wall of the baffle part 1001 is sealed with the vertical steel plate 301, which can prevent water leakage and fix the baffle part 1001, so that after the connection, the water retaining assembly 10 will not contact the dynamometer hub 4, and will not affect the normal operation of the dynamometer hub 4; an inner folding edge is provided on the other side wall of the baffle part 1001 to prevent water from flowing out of the side wall; the upper end of the baffle part 1001 extends out of the dynamometer platform 13 to receive water thrown out from above the dynamometer hub.

[0068] Furthermore, the sidewalls of the baffle portion 1001 are provided with a circle of engaging protrusions, on which a circle of sealing rings 11 are embedded. The vertical steel plate 301 is provided with a stepped engaging groove, in which the sealing ring 11 and the engaging protrusions are engaged together. Several magnetic engagement points 12 are also provided between the stepped engaging groove and the sidewalls on both sides of the engaging protrusion. The magnetic engagement points 12 are magnets embedded in the two, and serve to position and pre-fix the components during installation.

[0069] Furthermore, the water spray assembly 14 includes a water spray bracket 1401 and a rotating nozzle 1402 disposed on the water spray bracket 1401. The rotating nozzle 1402 is connected to a water pipe, and an electric control valve is provided on the water pipe. The electric control valve is controlled to spray water mist in a quantitative manner.

[0070] Furthermore, a pair of slideways 15 are provided on the dynamometer platform 13 above the sliding base 2. A pair of water spray brackets 1401 are movably disposed in the slideways 15 via pulleys or sliders. The pair of water spray brackets 1401 are screwed to the dynamometer platform above the fixed base 1. The water spray brackets 1401 are configured to be fixed and movable, corresponding to the dynamometer hubs on the fixed base 1 and the sliding base 2, respectively, making water spraying more targeted and timely.

[0071] Example 3:

[0072] The difference between this embodiment and the second embodiment is that another structure of the rubber undulating plate is provided.

[0073] like Figure 12 As shown, a hollow channel is further provided inside the rubber undulating plate 7, and the hollow channel includes a plurality of main channels 16 and a plurality of branch channels 17 connected to the main channels 16, and the branch channels 17 extend toward the outer surface of the rubber undulating plate 7 and connect to the outside.

[0074] The hollow channels are provided inside the rubber undulating plate 7. On the one hand, the deformation ability of the rubber undulating plate 7 can be improved, thereby enhancing its elastic buffering performance. On the other hand, the hollow channels can store a certain amount of water during the wetting process. During the rotation of the dynamometer hub 4, the water can be temporarily stored in the hollow channels. When the rubber undulating plate 7 is pressed by the wheel, the water can be squeezed out, so that the rubber undulating plate 7 has a better and continuous wetting effect without the need for continuous water spraying. It is more like the state of water being released when a vehicle presses the ground when passing through a muddy road.

[0075] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A multi-surface simulated functional dynamometer device, comprising a dynamometer platform disposed on the ground, and a frame located below the dynamometer platform, wherein a fixed base and a sliding base are sequentially arranged on the inner side of the frame along the length of the dynamometer platform, and a dynamometer hub is mounted on each of the fixed base and the sliding base via a plurality of support frames, characterized in that: A plurality of mounting holes are arranged in an array on the circumferential wall of the dynamometer hub, and the mounting holes are used to connect and install rail steel rings or rubber undulating plates; the rail steel rings are arranged in pairs, and each pair of rail steel rings is respectively arranged on the dynamometer hubs arranged synchronously in opposite directions; the rubber undulating plates are a plurality of blocks arranged axially at intervals, the inner surface of the rubber undulating plates is in close contact with the outer surface of the dynamometer hub, and the outer surface of the rubber undulating plates is arc-shaped and has a plurality of wave grooves parallel to the axial direction; the dynamometer platform is further provided with a plurality of water spray assemblies on one side of the dynamometer hub, and the water spray assemblies are used to wet the dynamometer hub and / or the rubber undulating plates to simulate a wet and slippery state; the outer periphery of the dynamometer hub is also provided with a water retaining assembly, and the water retaining assembly is detachably mounted on the fixed base and the sliding base, and the water retaining assembly covers the outer peripheral portion of the dynamometer hub located below the dynamometer platform from the outer periphery; The dynamometer device includes the following road simulations: (1) Rail vehicle simulation test: The rail steel rings are installed on the dynamometer hub, and the rail spacing of the coaxially arranged rail steel rings is adjusted to match the wheel spacing of the rail vehicle to be tested. After the rail steel rings are fixed, the vehicle to be tested is towed or driven onto the rail steel rings, and the dynamometer hub is started to perform a dynamometer test of the track measurement; (2) Wave and undulating road simulation test: The rubber undulating plates are installed on the periphery of the dynamometer hub. The rubber undulating plates are arranged at equal intervals on the periphery of the dynamometer hub and the intervals are the same. The number and starting position of the rubber undulating plates on each dynamometer hub are the same. The sliding base is adjusted so that the intervals between the dynamometer hubs at the front and rear positions are the same as the wheelbase of the vehicle under test. The vehicle under test is towed or driven onto the dynamometer hub and the dynamometer hub is started. Under the action of the rubber undulating plates, the vehicle will move in waves and perform the corresponding dynamometer test. (3) Uneven road simulation test: The rubber undulating plates are installed on the periphery of the dynamometer hub. The rubber undulating plates are arranged at unequal intervals and at different intervals. The number and starting position of the rubber undulating plates on each dynamometer hub are set differently. The sliding base is adjusted so that the spacing between the dynamometer hubs at the front and rear positions is the same as the wheelbase of the vehicle under test. The vehicle under test is towed or driven onto the dynamometer hub, and the dynamometer hub is started. Under the action of the rubber undulating plates, the vehicle will move unevenly and perform the corresponding dynamometer test. (4) Simulation test of road surface with different adhesion coefficients: a road surface component panel with different adhesion coefficients is installed on the periphery of the dynamometer hub, the vehicle to be tested is driven onto the dynamometer hub, the dynamometer hub is started, and under the action of the road surface component panel with different adhesion coefficients, the adhesion coefficient is adjusted by using a water spray component, and the adhesion coefficient simulation range is adjusted, and the vehicle is subjected to the corresponding test; (5) Wet and slippery road simulation test: When the vehicle under test is located on the dynamometer hub, start the water spray assembly to continuously or intermittently spray water onto the rail steel ring or the rubber undulation plate to wet the rail steel ring and the rubber undulation plate. The vehicle under test will change from a dry road simulation condition to a wet and slippery road simulation condition, and the corresponding dynamometer test data will be recorded and analyzed and evaluated.

2. The multi-road surface simulation function dynamometer device according to claim 1, characterized in that: The rail steel ring includes an annular fixing portion and a rail portion integrally formed with the annular fixing portion. The rail portion is arranged in the middle of the annular fixing portion. The annular fixing portion is sleeved on the dynamometer hub and screwed to the mounting hole.

3. The multi-road surface simulation function dynamometer device according to claim 1, characterized in that: The length of a single rubber undulating plate does not exceed the axial length of the dynamometer hub. Multiple rubber undulating plates are screwed on the dynamometer hub at equal intervals and cover all the mounting holes. Each rubber undulating plate is provided with multiple stepped countersunk holes docked with the mounting holes.

4. The multi-road surface simulation function dynamometer device according to claim 3, characterized in that: Two rows of stepped countersunk holes are symmetrically provided on each of the rubber undulating plates, and connecting bolts are respectively installed in the stepped countersunk holes. The length of the rubber undulating plates is equal to the axial length of the outer periphery of the dynamometer hub.

5. The multi-road surface simulation function dynamometer device according to claim 1, characterized in that: The thickness of the middle part of the rubber undulating plate is greater than the thickness on both sides of the arc, and the thickness of the middle part of the rubber undulating plate ranges from 60 to 80 mm; the cross section of a single wave groove is semicircular and is distributed at equal intervals along the outer surface of the rubber undulating plate.

6. The multi-road surface simulation function dynamometer device according to claim 1, characterized in that: A hollow channel is further provided inside the rubber undulating plate. The hollow channel includes a plurality of main channels and a plurality of branch channels connected to the main channels. The branch channels extend toward the outer surface of the rubber undulating plate and connect to the outside.

7. The multi-road surface simulation function dynamometer device according to claim 1, characterized in that: The axial dimension of the water retaining assembly is larger than the axial length of the outer periphery of the dynamometer hub. The water retaining assembly includes an arc-shaped baffle portion and a water collecting portion. The baffle portion is symmetrically arranged on both sides of the water collecting portion. The water collecting portion is located below and is screwed to the fixed base or the sliding base through a set flange edge. The side wall of the baffle portion is snap-fitted and sealed to the vertical steel plate of the support frame. The side wall of the baffle portion away from the vertical steel plate is also provided with an inner folding edge, and the upper end of the baffle portion extends out a small section of the dynamometer platform.

8. The multi-road surface simulation function dynamometer device according to claim 7, characterized in that: The side wall of the baffle part is provided with a circle of locking protrusions, a circle of sealing rings is embedded on the locking protrusions, and a stepped locking groove is provided on the vertical steel plate. The sealing ring and the locking protrusions are locked together in the stepped locking grooves, and a number of magnetic engagement points are also provided between the stepped locking grooves and the side walls on both sides of the locking protrusions.

9. The multi-road surface simulation function dynamometer device according to claim 1, characterized in that: The water spray assembly includes a water spray bracket and a rotating sprinkler head arranged on the water spray bracket, the rotating sprinkler head is connected to a water pipe, and the water pipe is provided with an electric control valve; a pair of slides are provided on the dynamometer platform above the sliding base, a pair of the water spray brackets are movably arranged in the slides, and a pair of the water spray brackets are screwed and fixed to the dynamometer platform above the fixed base.

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