Rolling resistance testing device and method

Abstract

The invention relates to the technical field of rolling resistance testing, in particular to a rolling resistance testing device and method, and the device comprises a frame which is connected with a traction rod, and the traction rod is provided with a horizontal load sensor and a vertical load sensor; the test wheel is rotationally connected to the frame, and a torsion sensor and an angular velocity sensor are connected to the test wheel; the guide device is arranged at one end, far away from the test wheel, of the frame, and the guide device comprises a guide rocker and a guide wheel connected with the guide rocker; wherein the traction rod is used for being connected with a detection vehicle, and the guide rocker is used for being connected with a road surface driving mechanism. The traction rod is connected with the detection vehicle to realize outdoor test, the guide rocker is connected with the road surface driving mechanism to realize indoor test, more comprehensive working condition data can be obtained through indoor and outdoor test, and then a more accurate test result is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of rolling resistance testing, and particularly to a rolling resistance testing device and method. Background Art

[0002] Rolling resistance testing is an important method for evaluating the energy loss of a tire during rolling, which directly affects the fuel efficiency and emissions of a vehicle. It mainly involves the resistance generated by the deformation and road surface friction of the tire during rolling. Therefore, how to measure the rolling resistance of a tire has become a technical problem to be solved urgently at present.

[0003] In related technologies, the testing of rolling resistance is mostly implemented by the drum method. For example, the Chinese utility model patent with the publication number CN203502152U discloses a tire rolling resistance testing device and method on March 26, 2014. It simulates the road surface through a drum and a driving motor, presses the tire on the drum through a loading device, and obtains the resistance test result of the tire itself through a two-dimensional sensor, thereby improving the measurement accuracy and reliability.

[0004] However, the inventor found that the existing drum testing method cannot reflect the road surface structure and has certain limitations. Summary of the Invention

[0005] In view of at least one of the above technical problems, the present invention provides a rolling resistance testing device and method, and improves the reliability of the test result by improving the structure.

[0006] According to a first aspect of the present invention, there is provided a rolling resistance testing device, including: A frame, a towing bar is connected to the frame, and a horizontal load sensor and a vertical load sensor are provided on the towing bar; A test wheel, which is rotatably connected to the frame, and a torsion sensor and an angular velocity sensor are connected to the test wheel; A guiding device, which is arranged at one end of the frame far from the test wheel, and the guiding device includes a guiding rocker and a guiding wheel connected to the guiding rocker; Wherein, the towing bar is used for connecting with a detection vehicle, and the guiding rocker is used for connecting with a road surface driving mechanism.

[0007] In some embodiments of the present invention, the road surface driving mechanism includes a base, a chute is provided in the base, and a specimen is slidably arranged in the chute in a straight line; The road surface driving mechanism further includes a driving component for driving the specimen to move in the chute.

[0008] In some embodiments of the present invention, the driving assembly includes a motor fixed on the base and a lead screw connected to the motor. The lead screw is rotatably connected in the chute and is connected with a nut seat screwed to the lead screw.

[0009] In some embodiments of the present invention, the specimen is cast and formed with the same material as the test road surface.

[0010] In some embodiments of the present invention, a slide rail parallel to the lead screw or a pulley slidably disposed along the axial direction of the lead screw is provided in the chute.

[0011] In some embodiments of the present invention, the guide wheel is detachably connected to the guide rocker.

[0012] In some embodiments of the present invention, a connection hole matching the guide rocker is further provided on the base.

[0013] In some embodiments of the present invention, a pneumatic actuator for applying and adjusting the load is further provided on the vehicle frame.

[0014] In some embodiments of the present invention, a temperature sensor, a humidity sensor and an anemometer are further provided on the vehicle frame.

[0015] According to the second aspect of the present invention, a rolling resistance test method is further provided. The rolling resistance test device as described in any one of the first aspect is applied, and the method includes the following steps: Apply a set load on the vehicle frame and connect the guide rocker of the vehicle frame to the road surface driving mechanism; Rotate the test wheel on the road surface driving mechanism at a set speed and establish a reference database of the sensors; Separate the vehicle frame from the road surface driving mechanism, connect the towing bar on the vehicle frame to the test vehicle, perform outdoor tests at the same load and speed, and obtain the sensor parameters of the outdoor tests; Analyze the difference in rolling resistance between the two scenarios through timestamp synchronization and data alignment; Establish an environmental factor model and separate the true rolling resistance and environmental noise through a filtering algorithm; Establish a machine learning model and train the machine learning model with indoor and outdoor test data; Input tire parameters, load parameters, speed and environmental factor parameters into the trained machine learning model to obtain the output rolling resistance test value.

[0016] The beneficial effects of the present invention are as follows: Through the towing bar and guiding device provided on the vehicle frame, outdoor testing is achieved by connecting the towing bar to the test vehicle, and indoor testing is achieved by connecting the guiding rocker to the road surface driving mechanism. Through indoor and outdoor testing, more comprehensive working condition data can be obtained, and thus more accurate test results can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the rolling resistance testing device in the embodiment of the present invention; Figure 2 It is a schematic structural diagram of the rolling resistance testing device in the embodiment of the present invention (including the road surface driving mechanism); Figure 3 It is a schematic structural diagram of the road surface driving mechanism in the embodiment of the present invention; Figure 4 In the embodiment of the present invention Figure 3 The sectional view taken along the A-A direction; Figure 5 It is a flowchart of the steps of the rolling resistance testing method in the embodiment of the present invention.

[0019] Explanation of the reference numerals: 1. Vehicle frame; 11. Towing bar; 12. Horizontal load sensor; 13. Vertical load sensor; 14. Temperature sensor; 15. Humidity sensor; 16. Wind speed tester; 17. Pneumatic actuator; 2. Test wheel; 21. Torque sensor; 22. Angular velocity sensor; 3. Guiding device; 31. Guiding rocker; 32. Guiding wheel; 4. Road surface driving mechanism; 41. Base; 41a. Chute; 42. Specimen; 43. Driving component; 43a. Motor; 43b. Lead screw; 44. Pulley; 45. Connecting hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0021] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] As Figures 1 to 4 shown in the rolling resistance test device, which includes a vehicle frame 1, a test wheel 2 provided on the vehicle frame 1 and a guiding device 3. Specifically, please refer to Figure 1 , in the embodiments of this invention, the form of the vehicle frame 1 has various types. For example, it can be the vehicle frame 1 structure formed by welding simple profiles as shown in Figure 1 , or a real vehicle chassis can be used as the vehicle frame 1. Those skilled in the art can choose according to needs and are not limited here. In the embodiments of this invention, a towing bar 11 is connected to the vehicle frame 1, and a horizontal load sensor 12 and a vertical load sensor are provided on the towing bar 11; the horizontal load sensor 12 and the vertical load sensor 13 are used to detect the loads received by the vehicle frame 1 in the horizontal and vertical directions; in the embodiments of this invention, the test wheel 2 is rotatably connected to the vehicle frame 1, and a torque sensor 21 and an angular velocity sensor 22 are connected to the test wheel 2; the speed of the vehicle frame 1 can be obtained through the value measured by the angular velocity sensor 22, and the rolling resistance can be obtained by dividing the torque measured by the torque sensor 21 by the radius of the test wheel 2; in the embodiments of this invention, the guiding device 3 is provided at one end of the vehicle frame 1 far from the test wheel 2, and the guiding device 3 includes a guiding rocker 31 and a guiding wheel 32 connected to the guiding rocker 31; among them, the towing bar 11 is used to connect to the detection vehicle, and the guiding rocker 31 is used to connect to the road surface driving mechanism 4. Of course, it should be pointed out here that in the embodiments of this invention, the road surface driving mechanism 4 has various forms. For example, it can simulate the road surface through a drum-type structure in the prior art, or a conveyor belt structure, etc., and conduct indoor tests by moving the road surface.

[0024] In an embodiment of the present invention, through the towing bar 11 and the guiding device 3 provided on the vehicle frame 1, the outdoor test is realized by connecting the towing bar 11 with the test vehicle, and the indoor test is realized by connecting the guiding rocker 31 with the road surface driving mechanism 4. Through the indoor and outdoor tests, more comprehensive working condition data can be obtained, and then more accurate test results can be obtained.

[0025] Optionally, in some embodiments of the present invention, the specific structure of the road surface driving mechanism 4 is as Figure 3 shown in, which includes a base 41. There is a chute 41a in the base 41, and a specimen 42 that can be linearly slidably arranged is in the chute 41a. It should be noted here that in the embodiment of the present invention, the specimen 42 is the structure simulating the road surface. When it is specifically manufactured, it can be replaced with different road surface structures as needed to realize the test of different road surface textures. In the embodiment of the present invention, the road surface driving mechanism 4 further includes a driving component 43 for driving the specimen 42 to move in the chute 41a. It should be noted here that there are various structures for driving the specimen 42 to move in the chute 41a. For example, the movement of the synchronous belt can be driven by a motor 43a or the movement of the chain on the sprocket can be driven by a motor 43a, etc. Those skilled in the art can select according to needs.

[0026] In some embodiments of the present invention, please continue to refer to Figure 3 , the driving component 43 includes a motor 43a fixed on the base 41 and a lead screw 43b connected to the motor 43a. The lead screw 43b is rotatably connected in the chute 41a and is connected with a nut seat (not shown in the figure) screwed to the lead screw 43b. By the rotation of the motor 43a driving the rotation of the lead screw 43b, and through the screwing connection between the lead screw 43b and the nut seat, in the embodiment of the present invention, the nut seat is fixed on the specimen 42. Thus, when the motor 43a drives the lead screw 43b to rotate, the rotation of the nut seat on the lead screw 43b is realized, and then the specimen 42 is driven to move reciprocally.

[0027] In the embodiment of the present invention, the specimen 42 is cast from the same material as the test road surface. By making the specimen 42 have the same structure as the test road surface, the influence of environmental factors during indoor and outdoor tests under the same working conditions can be obtained.

[0028] Optionally, in order to further reduce the resistance when the specimen 42 moves in the chute 41a, in the embodiment of the present invention, there is a slide rail parallel to the lead screw 43b or a pulley 44 that can be slidably arranged along the axial direction of the lead screw 43b in the chute 41a. As Figure 4As shown in the figure, in an embodiment of the present invention, the pulley 44 can be rotatably arranged in the chute 41a or rotatably connected to the specimen 42. By providing the pulley 44 or a slide rail (not shown in the figure), the friction during the movement of the specimen 42 can be reduced, and the service life of the mechanism can be improved.

[0029] In an embodiment of the present invention, for facilitating the switching between indoor testing and outdoor testing, please refer to Figure 1 , the guide wheel 32 is detachably connected to the guide rocker 31. By setting it like this, when outdoor testing is required, the guide wheel 32 can be installed on the guide rocker 31. Of course, it should be noted here that there are various structural forms of detachable connections, and it can be screwed or connected by snap fasteners, etc. In addition, in an embodiment of the present invention, the base 41 also has a connection hole 45 matching the guide rocker 31. As Figure 2 shown in the figure, by providing a connection hole 45 on the base 41 that matches the guide rocker 31, the bottom end of the guide rocker 31 can be directly inserted into the connection hole 45 of the base 41 to achieve positioning and fixation. Of course, it should be noted here that when specifically connecting the guide rocker 31, the guide wheel 32 can be disassembled in the manner shown in Figure 2 the figure, or the guide rocker 31 can be installed directly without disassembly.

[0030] Optionally, in some embodiments of the present invention, the vehicle frame 1 also has a pneumatic actuator 17 for applying and adjusting the load. It should be noted here that the core of the pneumatic actuator 17 is to push the piston to move through compressed air, thereby generating force. In an embodiment of the present invention, the pneumatic actuator 17 is installed between the vehicle frame 1 and the test wheel 2. By adjusting the thrust or pull force of the piston on the vehicle frame 1, the contact force between the test wheel 2 and the road surface can be changed. The pneumatic actuator 17 is a prior art in this field, and its specific structure will not be introduced in detail here. In addition, in an embodiment of the present invention, the vehicle frame 1 also has a temperature sensor 14, a humidity sensor 15, and a wind speed tester 16. Through the setting of the above sensors, the environment during outdoor testing can be monitored, so as to obtain the influence of environmental factors on the measurement accuracy by comparing with indoor testing.

[0031] In an embodiment of the present invention, there is also provided a rolling resistance test method as shown in Figure 5 the figure, which applies the above rolling resistance test device and includes the following steps: S10: Apply a set load to the vehicle frame 1 and connect the guiding rocker 31 of the vehicle frame 1 to the road surface driving mechanism 4. It should be noted here that applying the set load can be achieved by the above pneumatic actuator 17 or can be achieved by other loading devices. The specific connection method between the guiding rocker 31 and the road surface driving mechanism 4 has been described above and will not be elaborated here. By connecting the guiding rocker 31 to the base 41, the stability of the vehicle frame 1 can be maintained, preventing the vehicle frame 1 from shifting or vibrating during the test. S20: Rotate the test wheel 2 on the road surface driving mechanism 4 at a set speed and establish a reference database for the sensors. Here, the set speed controls the rotation speed of the test wheel 2 through the road surface driving mechanism 4. The specific speed can be 50 km / h, 60 km / h, etc. After starting the test, corresponding data is measured by the horizontal and vertical sensors, the torque sensor 21, and the angular velocity sensor 22 on the vehicle frame 1, and the collected data is used as the reference data. Of course, it should be noted here that during the specific test, tests can be carried out under various loads, speeds, and road surface conditions.

[0032] S30: Disconnect the vehicle frame 1 from the road surface driving mechanism 4 and connect the towing bar 11 on the vehicle frame 1 to the test vehicle, and conduct outdoor tests at the same load and speed and obtain the sensor parameters of the outdoor test. When conducting tests on the actual outdoor road surface, the rolling resistance test is carried out at the same load and speed as the indoor test, and at the same time, environmental parameters such as temperature, humidity, wind speed, and road surface roughness are recorded.

[0033] S40: Analyze the difference in rolling resistance between the two scenarios through timestamp synchronization and data alignment. By adding timestamps, the consistency of the data time is ensured, so as to compare the rolling resistance values at the same time point. Through the analysis of the different parts, the influence of environmental factors such as wind speed and road surface changes on the rolling resistance is realized.

[0034] S50: Establish an environmental factor model and separate the true rolling resistance from the environmental noise through a filtering algorithm. Based on the outdoor test data, an environmental factor is established. In the embodiment of the present invention, the environmental factor can be temperature, humidity, wind speed, road surface roughness, etc. The filtering algorithm can be a Kalman filtering algorithm, etc. Through filtering, the true rolling resistance is separated from the environmental noise, thereby extracting the true rolling resistance value.

[0035] S60: Establish a machine learning model and train the machine learning model with indoor and outdoor test data. When specifically conducting the training, integrate the indoor and outdoor test data into a training data set, including tire parameters, load, speed, environmental factors, and rolling resistance values. Specifically, the machine learning model can adopt a random forest model, a neural network model, etc. By using the training data set, the model can be trained to optimize the parameter model so that it can accurately predict the rolling resistance.

[0036] S70: Input tire parameters, load parameters, speed, and environmental factor parameters into the already trained machine learning model to obtain the output rolling resistance test value. In the embodiments of the present invention, through indoor and outdoor rolling resistance tests and in combination with the machine learning model, rapid and accurate testing of the rolling resistance can be achieved, which not only provides a scientific basis for the design and performance optimization of tires, but also can test the performance of different road surfaces.

[0037] Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A rolling resistance testing device, characterized in that: include: A vehicle frame, the vehicle frame is connected to a traction rod, and the traction rod is provided with a horizontal load sensor and a vertical load sensor; A test wheel, rotatably connected to the frame, and the test wheel is connected to a torque sensor and an angular velocity sensor; A guide device, arranged on an end of the frame away from the test wheel, the guide device comprising a guide rocker and a guide wheel connected to the guide rocker; Wherein, the traction rod is used to be connected to the detection vehicle, and the guide rocker is used to be connected to the road driving mechanism.

2. The rolling resistance testing device according to claim 1, characterized in that: The road surface driving mechanism comprises a base, the base has a slide groove, and the slide groove has a sample that can slide linearly; The road surface driving mechanism also includes a driving component for driving the sample to move in the chute.

3. The rolling resistance testing device according to claim 2, characterized in that: The driving assembly comprises a motor fixed on the base and a screw connected to the motor. The screw is rotatably connected in the slide slot and is connected to a nut seat threadedly connected to the screw.

4. The rolling resistance testing device according to claim 2, characterized in that: The sample is cast with the same material as the test road surface.

5. The rolling resistance testing device according to claim 3, characterized in that: The slide groove is provided with a slide rail arranged parallel to the screw rod or a pulley slidably arranged along the axial direction of the screw rod.

6. The rolling resistance testing device according to claim 2, characterized in that: The guide wheel is detachably connected to the guide rocker.

7. The rolling resistance testing device according to claim 6, characterized in that: The base is also provided with a connection hole matching the guide rocker.

8. The rolling resistance testing device according to claim 1, characterized in that: The frame also has pneumatic actuators for applying and adjusting loads.

9. The rolling resistance testing device according to claim 1, characterized in that: The frame is also provided with a temperature sensor, a humidity sensor and a wind speed tester.

10. A rolling resistance testing method, characterized in that: Using the rolling resistance testing device as described in any one of claims 1 to 9 comprises the following steps: Applying a set load to the frame, and connecting the guide rocker of the frame to the road driving mechanism; Achieve rotation of the test wheel on the road driving mechanism at a set speed and establish a reference database of the sensor; Separate the vehicle frame from the road driving mechanism, connect the traction rod on the frame to the test vehicle, conduct outdoor tests with the same load and speed, and obtain sensor parameters for the outdoor tests; Through timestamp synchronization and data alignment, the difference in rolling resistance between the two scenarios is analyzed; Establish an environmental factor model and separate the real rolling resistance from the environmental noise through filtering algorithm; Build a machine learning model and train it using indoor and outdoor test data; Tire parameters, load parameters, speed and environmental factor parameters are input into the trained machine learning model to obtain the output rolling resistance test value.

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