Test method, equipment and storage medium for vehicle road sliding resistance

Abstract

The present invention discloses a method, device and storage medium for testing the road sliding resistance of a vehicle, wherein the method comprises: obtaining test parameters obtained according to an actual test environment, the test parameters including environmental parameters and sliding time nodes corresponding to each speed recording point in a round-trip direction in multiple groups of tests; judging whether there are speed recording points with the same speed in a certain direction, if so, automatically removing overlaps and merging repeated sliding into a single sliding, and connecting to obtain a whole section of continuous sliding in the direction; obtaining an average sliding time according to the continuous sliding time nodes in multiple groups of tests in the direction, and then obtaining the road sliding resistance of each speed recording point according to the average sliding time interval, and fitting the road sliding resistance corrected in combination with the environmental parameters and the corresponding vehicle speed to obtain the final road sliding resistance coefficient. Thus, the problem of low efficiency of the data processing and analysis process in the existing sliding resistance test process is solved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle resistance testing, and in particular to a method and device for testing vehicle road sliding resistance, and a computer-readable storage medium. Background Art

[0002] In the existing analysis methods of vehicle sliding resistance data, there are few studies on the automatic processing of sliding time. Generally, multiple groups of sliding data are manually counted and calculated. In the case where the vehicle is sliding in sections due to insufficient road length, it is necessary to add up the time interval between each speed recording point to form a whole section of sliding time. The data processing process of the sliding time is cumbersome, time-consuming and labor-intensive because of the time point processing of the segmented sliding. In order to improve work efficiency, it is urgent to adopt an analysis method for automatically processing the sliding time. Summary of the invention

[0003] The main purpose of the present invention is to provide a method for testing the road sliding resistance of a vehicle, aiming to solve the technical problem of low efficiency in the processing and analysis of sliding data in the prior art.

[0004] To achieve the above object, the present invention provides a method for testing the road sliding resistance of a vehicle, the method comprising:

[0005] Acquire test parameters of multiple groups of road sliding resistance tests performed on the vehicle in an actual test environment, wherein the test parameters include environmental parameters and sliding time nodes corresponding to each vehicle speed recording point in the multiple groups of road sliding resistance tests;

[0006] Determine whether there are speed record points with the same vehicle speed. If so, automatically remove the overlap of repeated gliding stages corresponding to the speed record points with the same vehicle speed and merge them into a single gliding stage, so as to obtain a whole continuous gliding stage;

[0007] According to the continuous coasting time nodes of the entire continuous coasting stage in the multiple groups of tests, the average coasting time node of each vehicle speed recording point is obtained, and the average coasting time interval of the average coasting time nodes of adjacent vehicle speed recording points is calculated;

[0008] The road sliding resistance at each speed recording point is obtained according to the average sliding time interval, and is corrected in combination with the environmental parameters. The corrected road sliding resistance and the vehicle speed corresponding to each speed recording point in the entire continuous sliding stage are fitted to obtain a final road sliding resistance coefficient.

[0009] Optionally, after the step of determining whether there are speed record points with the same speed, the method further includes:

[0010] If there are no speed record points with the same speed, the coasting time nodes corresponding to the acquired speed record points are directly used as the continuous coasting time nodes, and the coasting stage without the speed record points with the same speed is used as the entire continuous coasting stage.

[0011] Optionally, the repeated coasting stage is divided into at least a first repeated coasting stage and a second repeated coasting stage, the vehicle speeds corresponding to the speed recording points in the first repeated coasting stage and the second repeated coasting stage are the same, but the coasting time nodes corresponding to the speed recording points are different.

[0012] The steps of automatically removing overlaps and merging into a single taxiing phase include:

[0013] In the vehicle speed recording points of the same vehicle speed, a coasting time interval is obtained according to the coasting time nodes corresponding to the adjacent vehicle speed recording points, and the coasting time intervals of the first repeated coasting stage and the second repeated coasting stage are averaged to obtain a target coasting time interval between the adjacent vehicle speed recording points;

[0014] The coasting time node corresponding to the highest vehicle speed recording point of the first repeated coasting stage is kept unchanged, and the target coasting time interval is used as the new time interval to obtain a new coasting time node of the single coasting stage, thereby completing the de-duplication and merging of the repeated coasting stages.

[0015] Optionally, the step of connecting to obtain a whole continuous sliding stage includes:

[0016] The coasting time nodes and the coasting time intervals corresponding to the vehicle speed recording points in the high-speed coasting stage are kept unchanged, wherein the speeds corresponding to the vehicle speed recording points in the high-speed coasting stage are all higher than the speeds corresponding to the vehicle speed recording points with the highest speeds in the repeated coasting stage, and the first repeated coasting stage is coasted after the high-speed coasting stage;

[0017] The gliding time nodes corresponding to the vehicle speed recording points in the low-speed gliding stage are updated, wherein the speeds corresponding to the vehicle speed recording points in the low-speed gliding stage are all lower than the speeds corresponding to the vehicle speed recording points with the lowest speeds in the repeated gliding stage, and the gliding in the second repeated gliding stage is performed before the low-speed gliding stage.

[0018] Optionally, the step of updating the coasting time nodes corresponding to each vehicle speed recording point in the low-speed coasting stage includes:

[0019] Based on the gliding time node corresponding to the speed recording point of the lowest speed in the repeated gliding phase after de-duplication and merging, the gliding time interval of the previous low-speed gliding phase is kept unchanged, and the gliding time node of the low-speed gliding phase is updated.

[0020] Optionally, the step of obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval includes:

[0021] According to the average sliding time interval of each vehicle speed recording point in multiple groups of road sliding resistance tests and the mass of the test vehicle, the road sliding resistance corresponding to each vehicle speed recording point is obtained.

[0022] Optionally, the step of performing correction in combination with the environmental parameters includes:

[0023] The road sliding resistance is corrected according to the environmental parameters to obtain the corrected road sliding resistance corresponding to each vehicle speed recording point.

[0024] Optionally, the step of fitting the corrected road sliding resistance and the vehicle speed corresponding to each vehicle speed recording point in the entire continuous sliding stage to obtain a final road sliding resistance coefficient includes:

[0025] The functional relationship between vehicle speed and road sliding resistance is expressed as F new =F0+F1×v+F2×v 2 , the vehicle speed corresponding to each speed recording point and the corrected road sliding resistance are fitted and calculated, where F0, F1, and F2 are the final road sliding resistance coefficients.

[0026] In addition, to achieve the above-mentioned purpose, the present invention also provides a vehicle road sliding resistance testing device, the vehicle road sliding resistance testing device comprising: a memory, a processor, and a vehicle road sliding resistance testing program stored in the memory and executable on the processor, the vehicle road sliding resistance testing program, when executed by the processor, implements the steps of the vehicle road sliding resistance testing method as described above.

[0027] In addition, to achieve the above-mentioned purpose, the present invention also provides a computer-readable storage medium, on which a test program for vehicle road sliding resistance is stored. When the test program for vehicle road sliding resistance is executed by a processor, the steps of the test method for vehicle road sliding resistance as described above are implemented.

[0028] A method, device and computer-readable storage medium for testing the road sliding resistance of a vehicle proposed in an embodiment of the present invention. The method obtains test parameters obtained according to an actual test environment, wherein the test parameters include environmental parameters and sliding time nodes corresponding to each speed recording point in a round-trip direction in multiple groups of tests; determines whether there are speed recording points with the same speed in the direction, and if so, automatically removes overlaps and merges repeated sliding of the high-speed sliding stage and the low-speed sliding stage corresponding to the speed recording points with the same speed into a single sliding, thereby connecting to obtain a whole section of continuous sliding in the direction; obtains the average sliding time of each speed recording point according to the continuous sliding time nodes in multiple groups of tests in the direction, and then obtains the road sliding resistance of each speed recording point according to the average sliding time interval in the direction, and corrects it in combination with the environmental parameters, and fits the corrected road sliding resistance and the vehicle speeds corresponding to each speed record of the whole section of continuous sliding to obtain a final road sliding resistance coefficient. By automatically removing the overlaps and merging the repeated sliding stages to obtain a whole continuous sliding section, the automatically calculated road sliding resistance is automatically corrected and fitted to obtain the final road sliding resistance coefficient. Furthermore, the final road sliding resistance coefficient obtained automatically can be used to test the corresponding relationship between speed and resistance, thereby saving time and reducing workload, and achieving efficient resistance testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the terminal structure of the hardware operating environment involved in the embodiment of the present invention;

[0030] Figure 2 The figure is a flow chart of an embodiment of a method for testing the road sliding resistance of a vehicle according to the present invention.

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0033] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] like Figure 1 As shown, Figure 1 It is a schematic diagram of the terminal structure of the hardware operating environment involved in the embodiment of the present invention.

[0035] The operating device of the embodiment of the present invention may be a PC, or may be a mobile terminal device with a display function, such as a smart phone, a tablet computer, an e-book reader, or a portable computer.

[0036] like Figure 1 As shown, the operating device may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0037] Optionally, the operating device may also include a camera, an RF (Radio Frequency) circuit, a sensor, an audio circuit, a WiFi module, and the like. Among them, sensors include light sensors, motion sensors, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor. As a type of motion sensor, the gravity acceleration sensor can detect the magnitude of acceleration in all directions (generally three axes), and can detect the magnitude and direction of gravity when stationary. It can be used for applications that identify the posture of mobile operating devices (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometers, tapping), etc.; of course, the mobile operating device can also be equipped with other sensors such as gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., which will not be repeated here.

[0038] Those skilled in the art will understand that Figure 1 The operating device structure shown in the figure does not constitute a limitation on the operating device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0039] like Figure 1 As shown, the memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module, and a vehicle road sliding resistance test program.

[0040] exist Figure 1In the running device shown, the network interface 1004 is mainly used to connect to the backend server and perform data communication with the backend server; the user interface 1003 is mainly used to connect to the client (user end) and perform data communication with the client; and the processor 1001 can be used to call the vehicle road sliding resistance test program stored in the memory 1005, and perform the following operations:

[0041] Acquire test parameters of multiple groups of road sliding resistance tests performed on the vehicle in an actual test environment, wherein the test parameters include environmental parameters and sliding time nodes corresponding to each vehicle speed recording point in the multiple groups of road sliding resistance tests;

[0042] Determine whether there are speed record points with the same vehicle speed. If so, automatically remove the overlap of repeated gliding stages corresponding to the speed record points with the same vehicle speed and merge them into a single gliding stage, so as to obtain a whole continuous gliding stage;

[0043] According to the continuous coasting time nodes of the entire continuous coasting stage in the multiple groups of tests, the average coasting time node of each vehicle speed recording point is obtained, and the average coasting time interval of the average coasting time nodes of adjacent vehicle speed recording points is calculated;

[0044] The road sliding resistance at each speed recording point is obtained according to the average sliding time interval, and is corrected in combination with the environmental parameters. The corrected road sliding resistance and the vehicle speed corresponding to each speed recording point in the entire continuous sliding stage are fitted to obtain a final road sliding resistance coefficient.

[0045] Further, the processor 1001 may call a test program of the vehicle road sliding resistance stored in the memory 1005, and further perform the following operations:

[0046] If there are no speed record points with the same speed, the coasting time nodes corresponding to the acquired speed record points are directly used as the continuous coasting time nodes, and the coasting stage without the speed record points with the same speed is used as the entire continuous coasting stage.

[0047] Further, the processor 1001 may call a test program of the vehicle road sliding resistance stored in the memory 1005, and further perform the following operations:

[0048] The repeated coasting stage is divided into at least a first repeated coasting stage and a second repeated coasting stage. The vehicle speeds corresponding to the vehicle speed recording points in the first repeated coasting stage and the second repeated coasting stage are the same, but the coasting time nodes corresponding to the vehicle speed recording points are different.

[0049] In the vehicle speed recording points of the same vehicle speed, a coasting time interval is obtained according to the coasting time nodes corresponding to the adjacent vehicle speed recording points, and the coasting time intervals of the first repeated coasting stage and the second repeated coasting stage are averaged to obtain a target coasting time interval between the adjacent vehicle speed recording points;

[0050] The coasting time node corresponding to the highest vehicle speed recording point of the first repeated coasting stage is kept unchanged, and the target coasting time interval is used as the new time interval to obtain a new coasting time node of the single coasting stage, thereby completing the de-duplication and merging of the repeated coasting stages.

[0051] Further, the processor 1001 may call a test program of the vehicle road sliding resistance stored in the memory 1005, and further perform the following operations:

[0052] The coasting time nodes and the coasting time intervals corresponding to the vehicle speed recording points in the high-speed coasting stage are kept unchanged, wherein the speeds corresponding to the vehicle speed recording points in the high-speed coasting stage are all higher than the speeds corresponding to the vehicle speed recording points with the highest speeds in the repeated coasting stage, and the first repeated coasting stage is coasted after the high-speed coasting stage;

[0053] The gliding time nodes corresponding to the vehicle speed recording points in the low-speed gliding stage are updated, wherein the speeds corresponding to the vehicle speed recording points in the low-speed gliding stage are all lower than the speeds corresponding to the vehicle speed recording points with the lowest speeds in the repeated gliding stage, and the gliding in the second repeated gliding stage is performed before the low-speed gliding stage.

[0054] Further, the processor 1001 may call a test program of the vehicle road sliding resistance stored in the memory 1005, and further perform the following operations:

[0055] Based on the gliding time node corresponding to the speed recording point of the lowest speed in the repeated gliding phase after de-duplication and merging, the gliding time interval of the previous low-speed gliding phase is kept unchanged, and the gliding time node of the low-speed gliding phase is updated.

[0056] Further, the processor 1001 may call a test program of the vehicle road sliding resistance stored in the memory 1005, and further perform the following operations:

[0057] According to the average sliding time interval of each vehicle speed recording point in multiple groups of road sliding resistance tests and the mass of the test vehicle, the road sliding resistance corresponding to each vehicle speed recording point is obtained.

[0058] Further, the processor 1001 may call a test program of the vehicle road sliding resistance stored in the memory 1005, and further perform the following operations:

[0059] The road sliding resistance is corrected according to the environmental parameters to obtain the corrected road sliding resistance corresponding to each vehicle speed recording point.

[0060] Further, the processor 1001 may call a test program of the vehicle road sliding resistance stored in the memory 1005, and further perform the following operations:

[0061] The functional relationship between vehicle speed and road sliding resistance is expressed as F new =F0+F1×v+F2×v 2 , the vehicle speed corresponding to each speed recording point and the corrected road sliding resistance are fitted and calculated, where F0, F1, and F2 are the final road sliding resistance coefficients.

[0062] Reference Figure 2 According to an embodiment of the present invention, a method for testing the road sliding resistance of a vehicle is provided. The method for testing the road sliding resistance of a vehicle comprises:

[0063] Step S10, obtaining test parameters of multiple groups of road sliding resistance tests performed on the vehicle in an actual test environment, wherein the test parameters include environmental parameters and sliding time nodes corresponding to each vehicle speed recording point in the multiple groups of road sliding resistance tests.

[0064] According to the actual test environment, the experimenter records and provides the parameters of the vehicle road sliding resistance test, including: test mass, wind speed, temperature, humidity, air pressure, and each group of sliding time in both directions. In this embodiment, at least 6 groups of sliding time in both directions are included. Among them, the sliding time is recorded and displayed in a matrix array. The matrix data contains the corresponding relationship between each vehicle speed recording point and each group of sliding time nodes, as shown in Table 1 below:

[0065] Table 1

[0066]

[0067]

[0068] In Table 1 of the present embodiment, the maximum speed of the vehicle is selected as 100km / h; the speed reduction step length is selected as 5km / h during gliding, that is, gliding starts from the maximum speed of the vehicle, and a gliding time node is recorded every time the speed is reduced by 5km / h; the round-trip direction is selected as the north-south direction; when gliding is performed in multiple sections, in order to reduce the connection error of the gliding time node processing, the end speed of the previous gliding section cannot be directly used as the starting speed of the next gliding section, but the starting speed of the next gliding section should be set to be greater than the end speed of the previous gliding section, and repeated gliding is performed and overlaps are removed and merged and connected, so as to eliminate the error of connecting the two sections before and after gliding as much as possible. In the embodiment of the present invention, a speed of 10km / h and 2 steps is selected, that is, the starting speed of the second section in Table 1 is 50km / h greater than the ending speed of the first section, 40km / h, which is 10km / h greater. Therefore, 50km / h to 45km / h and 45km / h to 40km / h are selected as repeated sliding stages, that is, because the road sliding resistance of the vehicle model to be tested is relatively small, and considering the limitation of the length of the test road, after the first sliding stage (100km / h to 40km / h) is completed, the second sliding stage (50km / h to 0km / h) is required; only two groups of tests are intercepted in Table 1 for explanation;

[0069] When inputting the test parameter data, the default is that the first column is the vehicle speed, the second, fourth, sixth, ... columns are direction a, that is, the direction from south to north in Table 1, and the third, fifth, seventh, ... columns are direction b, that is, the direction from north to south in Table 1. Since the vehicle is set to the neutral gear at the maximum speed of the vehicle to be tested and then coasts to a stop, the vehicle speed in Table 1 is gradually reduced, and the coasting time node is gradually increased.

[0070] Step S20, determining whether there are speed record points with the same speed, if so, automatically removing overlaps and merging the repeated gliding stages corresponding to the speed record points with the same speed into a single gliding stage, thereby connecting to obtain a whole continuous gliding stage.

[0071] Search each speed value in the column where the speed record point is located (entered in the first column by default), and compare to determine whether there are the same speeds. If it is determined that there are speed record points with the same speed, it means that the vehicle to be tested has used multiple gliding to complete data collection and recording, and it is necessary to convert the gliding time nodes of multiple gliding into a complete gliding through calculation. Table 1 is also used for illustration. In the first column, it can be found through comparison that the speed record points corresponding to 50km / h to 45km / h and 45km / h to 40km / h have repeated gliding time nodes collected and recorded. At this time, the gliding stage with a speed greater than 50km / h is regarded as a high-speed gliding stage, that is, the gliding stage from 100km / h to 55km / h in Table 1 is regarded as a high-speed gliding stage; the gliding stage with a speed less than 40km / h is regarded as a low-speed gliding stage, that is, the gliding stage from 35km / h to 0km / h in Table 1 is regarded as a low-speed gliding stage. The taxiing stage from 50 km / h to 40 km / h is regarded as a repeated taxiing stage, which is deduplicated and merged to connect the high-speed taxiing stage and the low-speed taxiing stage, thereby obtaining a whole continuous taxiing section.

[0072] In the embodiment of the present invention, there is no limit on the number of repeated coasting stages, and more than one repeated coasting stage can be selected to adapt to the road coasting resistance of the vehicle model to be tested and the length of the test road, or other limiting conditions that affect the accuracy of the final road coasting resistance coefficient. Similarly, in the embodiment of the present invention, only the test method that makes adaptive adjustments to the road coasting resistance of the vehicle model to be tested and the length of the test road is used, but the limiting conditions that affect the accuracy of the final road coasting resistance coefficient are not limited, and it should be considered that the road coasting resistance test under other limiting conditions can be implemented.

[0073] Step S30, obtaining the average coasting time node of each vehicle speed recording point according to the continuous coasting time nodes of the entire continuous coasting stage in multiple groups of tests, and calculating the average coasting time interval of the average coasting time nodes of adjacent vehicle speed recording points.

[0074] After de-duplication and merging of repeated gliding phases, and connecting the high-speed gliding phase and the low-speed gliding phase, a whole section of continuous gliding is obtained. In a whole section of continuous gliding, there are no longer repeated collection and recording of gliding time nodes and corresponding vehicle speeds. At this time, for multiple groups of tests in the same direction, each speed recording point corresponds to multiple continuous gliding time nodes in the multiple groups of tests. In this implementation, since at least 6 groups of gliding time in the round-trip direction are included, a certain speed recording point should correspond to 6 continuous gliding time nodes. Because Table 1 only intercepts two groups of tests for illustration, in Table 1, taking the 90km / h speed recording point as an example, the average gliding time of the 90km / h speed recording point is (21+19+20+20) / 4=20s.

[0075] The difference between the average gliding times corresponding to two adjacent speed recording points is the average gliding time interval. Taking Table 1 as an example, the average gliding time of the 85km / h speed recording point is (25+23+25+23) / 4=24s, so the average gliding time interval between the 90km / h speed recording point and the 85km / h speed recording point is 4s.

[0076] Step S40, obtaining the road sliding resistance of each speed recording point according to the average sliding time interval, correcting it in combination with the environmental parameters, and fitting the corrected road sliding resistance and the vehicle speed corresponding to each speed recording point in the entire continuous sliding stage to obtain a final road sliding resistance coefficient.

[0077] After obtaining the average sliding time interval of the entire continuous sliding stage, the road sliding resistance of each speed recording point can be obtained by applying the formula according to the average sliding time interval between each speed recording point and the test mass in the test parameters. The road sliding resistance is then corrected by another formula in combination with the environmental parameters to obtain the corrected road sliding resistance. Based on the corrected road sliding resistance and the vehicle speed corresponding to each speed recording point of the entire continuous sliding stage, the functional relationship expression is fitted to obtain the final data: the road sliding resistance coefficient.

[0078] In this embodiment, the test parameters obtained according to the actual test environment are obtained, wherein the test parameters include environmental parameters and the sliding time nodes corresponding to each speed recording point in the round-trip direction in multiple groups of tests. If it is determined that there are speed recording points with the same speed in a certain direction, the repeated sliding is automatically de-overlapped and merged into a single sliding, and a whole section of continuous sliding in the direction is obtained. The average sliding time is obtained according to the continuous sliding time nodes in multiple groups of tests in the direction, and then the road sliding resistance of each speed recording point is obtained according to the average sliding time interval, and the road sliding resistance corrected by the environmental parameters and the corresponding vehicle speed are fitted to obtain the final road sliding resistance coefficient. Through the vehicle road sliding resistance test method provided by an embodiment of the present invention, the input obtained only needs to import the test parameters, and the intensity is reduced by 80%; and the entire data calculation and processing process is automatically performed in only 20 seconds, and the efficiency is improved by 30 times. Thus, time is saved and workload is reduced, the problem of low efficiency of data processing and analysis process in the existing sliding resistance test process is solved, and efficient vehicle road sliding resistance test is realized.

[0079] At the same time, in the process of de-duplication and merging, repeated gliding is automatically de-duplicated and merged into a single gliding by taking the average of the gliding time intervals of the repeated gliding stages. In the entire continuous gliding stage in multiple groups of tests, the average gliding time node of each speed recording point is obtained by taking the average of each group of continuous gliding time nodes, and then the accurate average gliding time interval of adjacent speed recording points is calculated, and the final road gliding resistance coefficient is obtained with the accurate average gliding time interval. Therefore, the vehicle road gliding resistance test method provided by an embodiment of the present invention can also reduce errors and improve accuracy. Avoiding repeated tests due to inaccurate data also improves the efficiency of the vehicle road gliding resistance test from the side.

[0080] Optionally, after the step of determining whether there are speed record points with the same speed, the method further includes:

[0081] If there are no speed record points with the same speed, the coasting time nodes corresponding to the acquired speed record points are directly used as the continuous coasting time nodes, and the coasting stage without the speed record points with the same speed is used as the entire continuous coasting stage.

[0082] In one embodiment of the present invention, if it is determined that there are no speed measurement recording points with the same vehicle speed, it means that the vehicle has completed the data recording of the coasting time node by one period of continuous coasting, and no segmented test is performed. The coasting time node corresponding to each vehicle speed recording point can be directly extracted. At this time, the coasting time node corresponding to each vehicle speed recording point is the continuous coasting time node, and then the average coasting time interval is calculated, and finally the road coasting resistance coefficient corresponding to each vehicle speed recording point in the continuous coasting is obtained.

[0083] In this embodiment, if the road sliding resistance of the vehicle model to be tested is relatively large or the test road is long enough, a continuous sliding test is performed without segmented testing, and the final road sliding resistance coefficient can be obtained based on the continuous sliding test. This satisfies the test requirements under different test environments and achieves the purpose of obtaining the final road sliding resistance coefficient.

[0084] Optionally, the repeated coasting stage is divided into at least a first repeated coasting stage and a second repeated coasting stage, the vehicle speeds corresponding to the speed recording points in the first repeated coasting stage and the second repeated coasting stage are the same, but the coasting time nodes corresponding to the speed recording points are different.

[0085] The steps of automatically removing overlaps and merging into a single taxiing phase include:

[0086] In the vehicle speed recording points of the same vehicle speed, a coasting time interval is obtained according to the coasting time nodes corresponding to the adjacent vehicle speed recording points, and the coasting time intervals of the first repeated coasting stage and the second repeated coasting stage are averaged to obtain a target coasting time interval between the adjacent vehicle speed recording points;

[0087] The coasting time node corresponding to the highest vehicle speed recording point of the first repeated coasting stage is kept unchanged, and the target coasting time interval is used as the new time interval to obtain a new coasting time node of the single coasting stage, thereby completing the de-duplication and merging of the repeated coasting stages.

[0088] In one embodiment of the present invention, Table 1 is also used as an example for explanation. As can be seen from Table 1, the coasting stage from 50 km / h to 40 km / h is a repeated coasting stage, wherein the repeated coasting stage connected to 100 km / h to 55 km / h is the first repeated coasting stage, and the repeated coasting stage connected to 35 km / h to 0 km / h is the second repeated coasting stage. In the repeated coasting stage, two adjacent vehicle speed recording points are selected, such as 50 km / h and 45 km / h. Then, the gliding time interval is obtained according to the gliding time nodes corresponding to two adjacent speed recording points. Taking the first group from south to north in Table 1 as an example, the specific processing process is: the 50km / h speed recording point in the first repeated gliding stage after the high-speed gliding stage has a gliding time node of 65s, and the 45km / h speed recording point in the first repeated gliding stage after the high-speed gliding stage has a gliding time node of 74s, and the gliding time interval of the first repeated gliding stage is 74-65=9s; the 50km / h speed recording point in the second repeated gliding stage before the low-speed gliding stage has a gliding time node of 0s, and the 45km / h speed recording point in the second repeated gliding stage before the low-speed gliding stage has a gliding time node of 21s, and the gliding time interval of the second repeated gliding stage is 21-0=21s. In Table 1 of the embodiment of the present invention, for the same 50km / h to 45km / h gliding stage, the gliding time interval of the first repeated gliding stage is 9s, and the gliding time interval of the second repeated gliding stage is 21s. In fact, the difference between the two is about 3s, and will not be as much as 12s. The gliding time nodes are set here for illustration. Then take the average value of the gliding time intervals of the two (21+9) / 2=15s, which is the target gliding time interval between the speed recording points of 50km / h and 45km / h in the repeated gliding stage.

[0089] The highest speed record point of the first repeated coasting stage after the high-speed coasting stage, that is, the coasting time node 65s corresponding to the 50km / h speed record point, is kept unchanged, and the target coasting time interval 15s is used as the new time interval to obtain the new coasting time node 65+15=80s of the single coasting stage after de-duplication and merging. The same method is adopted to de-duplication and merge all the multiple coasting stages in the round-trip direction in multiple groups of tests, so that the coasting stages of multiple groups of tests eventually become a whole continuous coasting.

[0090] It can also be seen from this that the number of speed recording points corresponding to the repeated sliding stage is at least 2, not just 1, otherwise it is impossible to obtain the target sliding time interval to automatically connect the high-speed sliding stage and the low-speed sliding stage, and it is impossible to achieve the subsequent steps of obtaining the final road sliding resistance coefficient. The requirement of at least 2 speed recording points in the repeated sliding stage can be understood as the speed recording point with a larger speed is the connection point of the high-speed sliding stage, and the speed recording point with a smaller speed is the connection point of the low-speed sliding stage, so as to obtain a whole section of continuous sliding.

[0091] Optionally, the step of connecting to obtain a whole continuous sliding stage includes:

[0092] The coasting time nodes and the coasting time intervals corresponding to the vehicle speed recording points in the high-speed coasting stage are kept unchanged, wherein the speeds corresponding to the vehicle speed recording points in the high-speed coasting stage are all higher than the speeds corresponding to the vehicle speed recording points with the highest speeds in the repeated coasting stage, and the first repeated coasting stage is coasted after the high-speed coasting stage;

[0093] The gliding time nodes corresponding to the vehicle speed recording points in the low-speed gliding stage are updated, wherein the speeds corresponding to the vehicle speed recording points in the low-speed gliding stage are all lower than the speeds corresponding to the vehicle speed recording points with the lowest speeds in the repeated gliding stage, and the gliding in the second repeated gliding stage is performed before the low-speed gliding stage.

[0094] In one embodiment of the present invention, Table 1 is also used as an example for explanation. In Table 1, the vehicle speed of 100 km / h to 55 km / h is the high-speed coasting stage, and the coasting time nodes and coasting time intervals corresponding to each vehicle speed recording point in the high-speed coasting stage are not changed and remain unchanged.

[0095] As for the low-speed gliding stage with a vehicle speed of 35km / h to 0km / h, it is only necessary to update the gliding time nodes corresponding to each vehicle speed recording point in the low-speed gliding stage, without updating the gliding time intervals between each vehicle speed recording point in the low-speed gliding stage. The update of the gliding time nodes is completed after the single gliding stage that has been de-duplicated and merged.

[0096] Optionally, the step of updating the coasting time nodes corresponding to each vehicle speed recording point in the low-speed coasting stage includes:

[0097] Based on the gliding time node corresponding to the speed recording point of the lowest speed in the repeated gliding phase after de-duplication and merging, the gliding time interval of the previous low-speed gliding phase is kept unchanged, and the gliding time node of the low-speed gliding phase is updated.

[0098] In one embodiment of the present invention, Table 1 is also used as an example for explanation. In the first group from south to north in Table 1, the gliding time intervals between the vehicle speed recording points in the low-speed gliding stage after automatic calculation are specifically: 40km / h to 35km / h, 11s; 35km / h to 30km / h, 11s; 30km / h to 25km / h, 13s; 25km / h to 20km / h, 14s, and so on.

[0099] Based on the updated sliding time node 89s corresponding to the speed record point 40km / h of the lowest speed in the repeated sliding stage, the sliding time interval of the low-speed sliding stage before the connection (11s, 11s, 13s, 14s, etc., and so on) is kept unchanged. Thus, the sliding time node corresponding to the 35km / h speed record point in the low-speed sliding stage after the connection is 89+11=100s, the sliding time node corresponding to the 30km / h speed record point is 100+11=111s, the sliding time node corresponding to the 25km / h speed record point is 111+13=124s, the sliding time node corresponding to the 20km / h speed record point is 124+14=138s, and so on, thus completing the update of the sliding time node of the low-speed sliding stage.

[0100] Optionally, the step of obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval includes:

[0101] According to the average sliding time interval of each vehicle speed recording point in multiple groups of road sliding resistance tests and the mass of the test vehicle, the road sliding resistance corresponding to each vehicle speed recording point is obtained.

[0102] After obtaining the continuous gliding time nodes collected after a period of gliding, or the continuous gliding time nodes obtained by automatically de-duplicating and merging multiple repeated gliding segments, the average gliding time is obtained by taking the average of all the continuous gliding time nodes of each vehicle speed recording point in all test groups.

[0103] The difference between the average gliding times corresponding to two adjacent speed recording points is the average gliding time interval. Referring to formula CC4.3.1.4.4 in GB18352.6-2016, the road gliding resistance corresponding to each speed recording point can be calculated using the average gliding time interval of each speed recording point and the mass of the test vehicle.

[0104] Optionally, the step of performing correction in combination with the environmental parameters includes:

[0105] The road sliding resistance is corrected according to the environmental parameters to obtain the corrected road sliding resistance corresponding to each vehicle speed recording point.

[0106] Similarly, after correcting the environmental parameters according to the formula in CC4.5 of GB 18352.6-2016, the corrected sliding resistance at each speed recording point can be obtained. That is, the formula uses the road sliding resistance calculated by the formula CC4.3.1.4.4 in GB 18352.6-2016. After combining the test vehicle mass, wind speed, temperature, humidity, and air pressure, the corrected road sliding resistance can be obtained.

[0107] Optionally, the step of fitting the corrected road sliding resistance and the vehicle speed corresponding to each vehicle speed recording point in the entire continuous sliding stage to obtain a final road sliding resistance coefficient includes:

[0108] The functional relationship expression Fnew=F0+F1×v+F2×v2 of vehicle speed and road sliding resistance is used to fit the vehicle speed corresponding to each speed recording point and the corrected road sliding resistance, where F0, F1, and F2 are the final road sliding resistance coefficients.

[0109] A quadratic polynomial is used to fit each speed record point and its corresponding corrected road sliding resistance to obtain a functional relationship expression F corresponding to the vehicle speed and road sliding resistance. new =F0+F1×v+F2×v 2 , where F0, F1, and F2 are the final road sliding resistance coefficients of the vehicle to be tested, and v is the vehicle speed corresponding to a certain speed recording point. In the embodiment of the present invention, the functional relationship expression F commonly used in the industry is adopted. new =F0+F1×v+F2×v 2 The embodiment of the present invention does not limit the resistance function relationship expression obtained by speed and sliding resistance. After obtaining F0, F1, and F2, that is, the final road sliding resistance coefficient of the vehicle to be tested, the vehicle road sliding resistance at the vehicle speed can be directly obtained according to the vehicle speed.

[0110] In practical applications, by using the fitted functional relationship expression with the F0, F1, and F2 road sliding resistance coefficients, a certain vehicle speed in the actual environment can be obtained to calculate the road sliding resistance at the corresponding vehicle speed, which is used as the benchmark resistance. Based on the difference between the actual environment and the test environment, the benchmark resistance is adaptively adjusted to obtain the final accurate resistance at the corresponding vehicle speed.

[0111] In addition, an embodiment of the present invention also provides a vehicle road sliding resistance testing device, the vehicle road sliding resistance testing device comprising: a memory, a processor, and a vehicle road sliding resistance testing program stored in the memory and executable on the processor, the vehicle road sliding resistance testing program, when executed by the processor, implements the steps of the vehicle road sliding resistance testing method as described above.

[0112] In addition, an embodiment of the present invention further provides a computer-readable storage medium, on which a test program for vehicle road sliding resistance is stored. When the test program for vehicle road sliding resistance is executed by a processor, the steps of the vehicle road sliding resistance test method as described above are implemented.

[0113] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0114] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0115] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0116] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for testing the road sliding resistance of a vehicle, characterized in that: The testing method of the vehicle road sliding resistance includes: Acquire test parameters of multiple groups of road sliding resistance tests performed on the vehicle in an actual test environment, wherein the test parameters include environmental parameters and sliding time nodes corresponding to each vehicle speed recording point in the multiple groups of road sliding resistance tests; Determine whether there are speed record points with the same vehicle speed. If so, automatically remove the overlap of repeated gliding stages corresponding to the speed record points with the same vehicle speed and merge them into a single gliding stage, so as to obtain a whole continuous gliding stage; According to the continuous coasting time nodes of the entire continuous coasting stage in the multiple groups of tests, the average coasting time node of each vehicle speed recording point is obtained, and the average coasting time interval of the average coasting time nodes of adjacent vehicle speed recording points is calculated; Obtaining the road sliding resistance at each speed recording point according to the average sliding time interval, correcting it in combination with the environmental parameters, and fitting the corrected road sliding resistance and the vehicle speed corresponding to each speed recording point in the entire continuous sliding stage to obtain a final road sliding resistance coefficient; The steps of connecting to obtain a whole continuous sliding stage include: The coasting time nodes and the coasting time intervals corresponding to the vehicle speed recording points in the high-speed coasting stage are kept unchanged, wherein the speeds corresponding to the vehicle speed recording points in the high-speed coasting stage are all higher than the speeds corresponding to the vehicle speed recording points with the highest speeds in the repeated coasting stage, and the first repeated coasting stage is coasted after the high-speed coasting stage; The gliding time nodes corresponding to the vehicle speed recording points in the low-speed gliding stage are updated, wherein the speeds corresponding to the vehicle speed recording points in the low-speed gliding stage are all lower than the speeds corresponding to the vehicle speed recording points with the lowest speeds in the repeated gliding stage, and the gliding in the second repeated gliding stage is performed before the low-speed gliding stage.

2. The method for testing the road sliding resistance of a vehicle according to claim 1, characterized in that: After the step of determining whether there are vehicle speed record points with the same vehicle speed, the method further includes: If there are no speed record points with the same speed, the coasting time nodes corresponding to the acquired speed record points are directly used as the continuous coasting time nodes, and the coasting stage without the speed record points with the same speed is used as the entire continuous coasting stage.

3. The method for testing the road sliding resistance of a vehicle according to claim 1, characterized in that: The repeated coasting stage is divided into at least a first repeated coasting stage and a second repeated coasting stage. The vehicle speeds corresponding to the vehicle speed recording points in the first repeated coasting stage and the second repeated coasting stage are the same, but the coasting time nodes corresponding to the vehicle speed recording points are different. The steps of automatically removing overlaps and merging into a single taxiing phase include: In the vehicle speed recording points of the same vehicle speed, a coasting time interval is obtained according to the coasting time nodes corresponding to the adjacent vehicle speed recording points, and the coasting time intervals of the first repeated coasting stage and the second repeated coasting stage are averaged to obtain a target coasting time interval between the adjacent vehicle speed recording points; The coasting time node corresponding to the highest vehicle speed recording point of the first repeated coasting stage is kept unchanged, and the target coasting time interval is used as the new time interval to obtain a new coasting time node of the single coasting stage, thereby completing the de-duplication and merging of the repeated coasting stages.

4. The method for testing the road sliding resistance of a vehicle according to claim 1, characterized in that: The step of updating the coasting time nodes corresponding to each vehicle speed recording point in the low-speed coasting stage includes: Based on the gliding time node corresponding to the speed recording point of the lowest speed in the repeated gliding phase after de-duplication and merging, the gliding time interval of the previous low-speed gliding phase is kept unchanged, and the gliding time node of the low-speed gliding phase is updated.

5. The method for testing the road sliding resistance of a vehicle according to claim 1, characterized in that: The step of obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval comprises: According to the average sliding time interval of each vehicle speed recording point in multiple groups of road sliding resistance tests and the mass of the test vehicle, the road sliding resistance corresponding to each vehicle speed recording point is obtained.

6. The method for testing the road sliding resistance of a vehicle as claimed in claim 5, characterized in that: The step of correcting in combination with the environmental parameters comprises: The road sliding resistance is corrected according to the environmental parameters to obtain the corrected road sliding resistance corresponding to each vehicle speed recording point.

7. The method for testing the road sliding resistance of a vehicle according to claim 1, characterized in that: The step of fitting the corrected road sliding resistance and the vehicle speed corresponding to each vehicle speed recording point in the entire continuous sliding stage to obtain the final road sliding resistance coefficient includes: The functional relationship expression Fnew=F0+F1×v+F2×v2 of vehicle speed and road sliding resistance is used to fit the vehicle speed corresponding to each speed recording point and the corrected road sliding resistance, where F0, F1, and F2 are the final road sliding resistance coefficients.

8. A vehicle road sliding resistance test device, characterized in that: The vehicle road sliding resistance testing device includes: a memory, a processor, and a vehicle road sliding resistance testing program stored in the memory and executable on the processor. When the vehicle road sliding resistance testing program is executed by the processor, the steps of the vehicle road sliding resistance testing method as described in any one of claims 1 to 7 are implemented.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a vehicle road sliding resistance test program, and when the vehicle road sliding resistance test program is executed by a processor, the steps of the vehicle road sliding resistance test method as claimed in any one of claims 1 to 7 are implemented.

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