CN114117255A - Method and device for testing vehicle road sliding resistance and storage medium - Google Patents
Method and device for testing vehicle road sliding resistance and storage medium Download PDFInfo
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Abstract
The invention discloses a method, equipment and a storage medium for testing vehicle road sliding resistance, wherein the method comprises the following steps: obtaining test parameters obtained according to an actual test environment, wherein the test parameters comprise environment parameters and a plurality of groups of sliding time nodes corresponding to each vehicle speed recording point in the back-and-forth direction in the test; judging whether a vehicle speed recording point with the same vehicle speed exists in a certain direction, if so, automatically de-overlapping repeated sliding and forming single sliding, and connecting to obtain a whole continuous sliding in the direction; and obtaining average sliding time according to the continuous sliding time nodes in the direction in multiple groups of tests, further obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval, and fitting the road sliding resistance after the environmental parameters are corrected and the corresponding vehicle speed to obtain a final road sliding resistance coefficient. Therefore, the problem of low efficiency of the data processing and analyzing process in the conventional sliding resistance testing process is solved.
Description
Technical Field
The invention relates to the field of vehicle resistance testing, in particular to a method and equipment for testing vehicle road sliding resistance and a computer readable storage medium.
Background
In the conventional analysis method of vehicle sliding resistance data, the method for automatically processing the sliding time is not studied much, and generally, a plurality of groups of sliding data are manually counted and calculated. And for the condition that the vehicle slides in a subsection manner due to insufficient road length, the whole sliding time is finally accumulated according to the time interval between each vehicle speed recording point, and the data processing process of the sliding time is complex because the time point of the subsection sliding is processed, consumes time and labor. In order to improve the working efficiency, an analysis method for automatically processing the sliding time is urgently needed.
Disclosure of Invention
The invention mainly aims to provide a method for testing the road sliding resistance of a vehicle, and aims to solve the technical problem of low efficiency of processing and analyzing sliding data in the prior art.
In order to achieve the above object, the present invention provides a method for testing a vehicle road sliding resistance, comprising:
obtaining test parameters of a vehicle for carrying out a plurality of groups of road sliding resistance tests in an actual test environment, wherein the test parameters comprise environment parameters and sliding time nodes corresponding to each speed recording point in the plurality of groups of road sliding resistance tests;
judging whether vehicle speed recording points with the same vehicle speed exist or not, if so, automatically de-superposing repeated sliding stages corresponding to the vehicle speed recording points with the same vehicle speed and forming a single sliding stage, thereby obtaining a whole continuous sliding stage by linking;
obtaining the average sliding time node of each vehicle speed recording point according to the continuous sliding time nodes of the whole continuous sliding stage in a plurality of groups of tests, and calculating the average sliding time interval of the average sliding time nodes of adjacent vehicle speed recording points;
and obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval, correcting by combining the environmental parameters, and fitting the corrected road sliding resistance and the vehicle speed corresponding to each vehicle speed recording point in the whole continuous sliding stage to obtain a final road sliding resistance coefficient.
Optionally, after the step of determining whether there are vehicle speed recording points of the same vehicle speed, the method further includes:
and if the vehicle speed recording points with the same vehicle speed do not exist, directly taking the obtained sliding time nodes corresponding to the vehicle speed recording points as continuous sliding time nodes, and taking the sliding phase of the vehicle speed recording points without the same vehicle speed as the whole continuous sliding phase.
Optionally, the repeated coasting phase is at least divided into a first repeated coasting phase and a second repeated coasting phase, the vehicle speed corresponding to the vehicle speed recording points of the first repeated coasting phase and the second repeated coasting phase is the same, but the coasting time nodes corresponding to the vehicle speed recording points are different,
the step of automatically de-registering and becoming a single taxi phase includes:
obtaining a sliding time interval according to sliding time nodes corresponding to adjacent vehicle speed recording points in the vehicle speed recording points with the same vehicle speed, and averaging the sliding time intervals of the first repeated sliding stage and the second repeated sliding stage to obtain a target sliding time interval between the adjacent vehicle speed recording points;
and keeping the sliding time node corresponding to the highest vehicle speed recording point in the first repeated sliding stage unchanged, and obtaining a new sliding time node in the single sliding stage by taking the target sliding time interval as a new time interval, thereby completing duplication elimination and combination of the repeated sliding stages.
Optionally, the step of obtaining the whole continuous sliding stage by linking comprises:
keeping a sliding time node and a sliding time interval corresponding to each vehicle speed recording point in a high-speed sliding stage unchanged, wherein the speed corresponding to each vehicle speed recording point in the high-speed sliding stage is higher than the speed corresponding to the vehicle speed recording point with the highest speed in the repeated sliding stage, and sliding in a first repeated sliding stage after the high-speed sliding stage;
and updating the sliding time nodes corresponding to the vehicle speed recording points in the low-speed sliding stage, wherein the speed corresponding to each vehicle speed recording point in the low-speed sliding stage is lower than the speed corresponding to the vehicle speed recording point with the lowest speed in the repeated sliding stage, and sliding in the second repeated sliding stage is performed before the low-speed sliding stage.
Optionally, the step of updating the coasting time node corresponding to each vehicle speed record point in the low-speed coasting phase includes:
and keeping the sliding time interval of the low-speed sliding stage before the connection unchanged on the basis of the sliding time node corresponding to the vehicle speed recording point of the lowest vehicle speed in the repeated sliding stage after the duplication removal and combination, and finishing the updating of the sliding time node in the low-speed sliding stage.
Optionally, the step of obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval includes:
and obtaining the road sliding resistance corresponding to each speed recording point according to the average sliding time interval of each speed recording point in the multiple groups of road sliding resistance tests and the quality of the tested vehicle.
Optionally, the step of correcting in combination with the environmental parameter includes:
and correcting the road sliding resistance according to the environmental parameters to obtain the corrected road sliding resistance corresponding to each vehicle speed recording point.
Optionally, the step of fitting the corrected road sliding resistance and the vehicle speed corresponding to each vehicle speed record point in the whole continuous sliding stage to obtain a final road sliding resistance coefficient includes:
adopting a functional relation expression F of vehicle speed and road sliding resistancenew＝F0+F1×v+F2×v2And performing fitting calculation on the vehicle speed corresponding to each vehicle speed recording point and the corrected road sliding resistance, wherein F0, F1 and F2 are final road sliding resistance coefficients.
Further, to achieve the above object, the present invention also provides a test apparatus for vehicle road rolling resistance, comprising: the device comprises a memory, a processor and a test program of the vehicle road sliding resistance, wherein the test program of the vehicle road sliding resistance is stored on the memory and can run on the processor, and when being executed by the processor, the test program of the vehicle road sliding resistance realizes the steps of the test method of the vehicle road sliding resistance.
In addition, to achieve the above object, the present invention also provides a computer readable storage medium having stored thereon a test program of vehicle road skid resistance, which when executed by a processor implements the steps of the test method of vehicle road skid resistance as described above.
The method comprises the steps of obtaining test parameters obtained according to an actual test environment, wherein the test parameters comprise environment parameters and a plurality of groups of sliding time nodes corresponding to each vehicle speed recording point in the back-and-forth direction in the test; judging whether vehicle speed recording points with the same vehicle speed exist in the direction, if so, automatically de-superposing repeated sliding of a high-speed sliding stage and a low-speed sliding stage corresponding to the vehicle speed recording points with the same vehicle speed to form single sliding, and thus, continuously sliding in the whole section of the direction; and obtaining the average sliding time of each vehicle speed recording point according to the continuous sliding time nodes in the direction multi-group test, further obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval of the direction, correcting by combining the environmental parameters, and fitting the corrected road sliding resistance and the vehicle speed corresponding to each vehicle speed record of the whole continuous sliding to obtain a final road sliding resistance coefficient. And automatically correcting and fitting the automatically calculated road sliding resistance to obtain a final road sliding resistance coefficient. And furthermore, the corresponding relation between the speed and the resistance can be tested by using the final road sliding resistance coefficient which is automatically obtained, so that the time is saved, the workload is reduced, and the high-efficiency resistance test is realized.
Drawings
Fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an embodiment of a method for testing the road sliding resistance of the vehicle according to the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
As shown in fig. 1, fig. 1 is a schematic terminal structure diagram of a hardware operating environment according to an embodiment of the present invention.
The operation equipment of the embodiment of the invention can be a PC, and can also be a mobile terminal equipment with a display function, such as a smart phone, a tablet computer, an electronic book reader, a portable computer and the like.
As shown in fig. 1, the operation device may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein a communication bus 1002 is used to enable connective 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, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). The memory 1005 may alternatively be a storage device separate from the processor 1001.
Optionally, the operation device may further include a camera, a Radio Frequency (RF) circuit, a sensor, an audio circuit, a WiFi module, and the like. Such as light sensors, motion sensors, and other sensors. In particular, the light sensor may include an ambient light sensor and a proximity sensor. As one of the motion sensors, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when the mobile device is stationary, and can be used for applications (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration) for recognizing the attitude of the mobile device, and related functions (such as pedometer and tapping) for vibration recognition; of course, the mobile operation device may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, and the like, which are not described herein again.
Those skilled in the art will appreciate that the operational equipment configuration shown in FIG. 1 does not constitute a limitation of the operational equipment, and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a test program for a road skid resistance of a vehicle.
In the operating device shown in fig. 1, the network interface 1004 is mainly used for connecting to a backend server and performing data communication with the backend server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call a test program for the vehicle road sliding resistance stored in the memory 1005, and perform the following operations:
obtaining test parameters of a vehicle for carrying out a plurality of groups of road sliding resistance tests in an actual test environment, wherein the test parameters comprise environment parameters and sliding time nodes corresponding to each speed recording point in the plurality of groups of road sliding resistance tests;
judging whether vehicle speed recording points with the same vehicle speed exist or not, if so, automatically de-superposing repeated sliding stages corresponding to the vehicle speed recording points with the same vehicle speed and forming a single sliding stage, thereby obtaining a whole continuous sliding stage by linking;
obtaining the average sliding time node of each vehicle speed recording point according to the continuous sliding time nodes of the whole continuous sliding stage in a plurality of groups of tests, and calculating the average sliding time interval of the average sliding time nodes of adjacent vehicle speed recording points;
and obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval, correcting by combining the environmental parameters, and fitting the corrected road sliding resistance and the vehicle speed corresponding to each vehicle speed recording point in the whole continuous sliding stage to obtain a final road sliding resistance coefficient.
Further, the processor 1001 may call the test program of the vehicle road sliding resistance stored in the memory 1005, and also perform the following operations:
and if the vehicle speed recording points with the same vehicle speed do not exist, directly taking the obtained sliding time nodes corresponding to the vehicle speed recording points as continuous sliding time nodes, and taking the sliding phase of the vehicle speed recording points without the same vehicle speed as the whole continuous sliding phase.
Further, the processor 1001 may call the test program of the vehicle road sliding resistance stored in the memory 1005, and also perform the following operations:
the repeated sliding stage is at least divided into a first repeated sliding stage and a second repeated sliding stage, the vehicle speed corresponding to the vehicle speed recording points of the first repeated sliding stage and the second repeated sliding stage is the same, but the sliding time nodes corresponding to the vehicle speed recording points are different,
obtaining a sliding time interval according to sliding time nodes corresponding to adjacent vehicle speed recording points in the vehicle speed recording points with the same vehicle speed, and averaging the sliding time intervals of the first repeated sliding stage and the second repeated sliding stage to obtain a target sliding time interval between the adjacent vehicle speed recording points;
and keeping the sliding time node corresponding to the highest vehicle speed recording point in the first repeated sliding stage unchanged, and obtaining a new sliding time node in the single sliding stage by taking the target sliding time interval as a new time interval, thereby completing duplication elimination and combination of the repeated sliding stages.
Further, the processor 1001 may call the test program of the vehicle road sliding resistance stored in the memory 1005, and also perform the following operations:
keeping a sliding time node and a sliding time interval corresponding to each vehicle speed recording point in a high-speed sliding stage unchanged, wherein the speed corresponding to each vehicle speed recording point in the high-speed sliding stage is higher than the speed corresponding to the vehicle speed recording point with the highest speed in the repeated sliding stage, and sliding in a first repeated sliding stage after the high-speed sliding stage;
and updating the sliding time nodes corresponding to the vehicle speed recording points in the low-speed sliding stage, wherein the speed corresponding to each vehicle speed recording point in the low-speed sliding stage is lower than the speed corresponding to the vehicle speed recording point with the lowest speed in the repeated sliding stage, and sliding in the second repeated sliding stage is performed before the low-speed sliding stage.
Further, the processor 1001 may call the test program of the vehicle road sliding resistance stored in the memory 1005, and also perform the following operations:
and keeping the sliding time interval of the low-speed sliding stage before the connection unchanged on the basis of the sliding time node corresponding to the vehicle speed recording point of the lowest vehicle speed in the repeated sliding stage after the duplication removal and combination, and finishing the updating of the sliding time node in the low-speed sliding stage.
Further, the processor 1001 may call the test program of the vehicle road sliding resistance stored in the memory 1005, and also perform the following operations:
and obtaining the road sliding resistance corresponding to each speed recording point according to the average sliding time interval of each speed recording point in the multiple groups of road sliding resistance tests and the quality of the tested vehicle.
Further, the processor 1001 may call the test program of the vehicle road sliding resistance stored in the memory 1005, and also perform the following operations:
and correcting the road sliding resistance according to the environmental parameters to obtain the corrected road sliding resistance corresponding to each vehicle speed recording point.
Further, the processor 1001 may call the test program of the vehicle road sliding resistance stored in the memory 1005, and also perform the following operations:
adopting a functional relation expression F of vehicle speed and road sliding resistancenew＝F0+F1×v+F2×v2And performing fitting calculation on the vehicle speed corresponding to each vehicle speed recording point and the corrected road sliding resistance, wherein F0, F1 and F2 are final road sliding resistance coefficients.
Referring to fig. 2, an embodiment of the present invention provides a method for testing a vehicle road sliding resistance, where the method includes:
and step S10, obtaining test parameters of the vehicle for carrying out a plurality of groups of road sliding resistance tests in an actual test environment, wherein the test parameters comprise environment parameters and sliding time nodes corresponding to each vehicle speed recording point in the plurality of groups of road sliding resistance tests.
According to the actual test environment, parameters of the vehicle during the road sliding resistance test are recorded and provided by experimenters, and the parameters comprise: the test quality, wind speed, air temperature, humidity, air pressure, and the sliding time of each group in the two directions to and fro, in this embodiment, at least 6 groups of sliding time in the directions to and fro are included. The taxi time is recorded and displayed according to a matrix array, the matrix data comprises the corresponding relation between each vehicle speed recording point and each taxi time node, and the following table 1 shows that:
TABLE 1
In table 1 of the present embodiment, the maximum vehicle speed of the vehicle is selected to be 100 km/h; selecting a speed reduction step length of 5km/h during sliding, namely starting sliding from the maximum speed of the vehicle, and recording a sliding time node every time the speed reduction step length is reduced by 5 km/h; the back and forth direction is selected as the north and south direction; when sliding is carried out in multiple sections, in order to reduce connectivity errors of sliding time node processing, the end speed of the previous section of sliding cannot be directly used as the starting speed of the next section of sliding, and the starting speed of the next section of sliding should be set to be larger than the end speed of the previous section of sliding to carry out repeated sliding, de-overlapping and joining, so that errors of joining the previous section of sliding and the next section of sliding are eliminated as far as possible. In an embodiment of the invention, a speed of 2 steps greater than 10km/h is selected, i.e. the starting speed of 50km/h in the second section of Table 1 is 10km/h greater than the ending speed of 40km/h in the first section. Selecting 50km/h to 45km/h and 45km/h to 40km/h as repeated sliding stages, namely, after the first section of sliding (100km/h to 40km/h) is finished, performing second section of sliding (50km/h to 0km/h) due to small road sliding resistance of the vehicle type to be tested and consideration of the limit of the length of a test road; only two sets of tests are intercepted in table 1 for illustration;
when data for the test parameters is entered, default is for 1 st column to be vehicle speed, 2 nd, 4 th, 6.. to be a-direction, i.e. the north-to-south direction in table 1, and for 3 rd, 5 th, 7.. to be b-direction, i.e. the north-to-south direction in table 1. The vehicle speed in table 1 is gradually reduced and the coast time node is gradually increased because the coast to stop is set after neutral at the maximum vehicle speed of the vehicle to be tested.
And step S20, judging whether the vehicle speed recording points with the same vehicle speed exist, if so, automatically de-superposing repeated sliding stages corresponding to the vehicle speed recording points with the same vehicle speed to form a single sliding stage, thereby obtaining the whole continuous sliding stage by linking.
And searching each vehicle speed value in the column of the vehicle speed recording point (input to the first column by default), and comparing and judging whether the same vehicle speed exists or not. If the vehicle speed recording points with the same vehicle speed are judged, that is, the vehicle to be tested adopts multiple sliding to complete data acquisition and recording, the sliding time nodes of the multiple sliding need to be converted into one-time complete sliding through calculation. Also, as shown in table 1, in the first column, it can be found through comparison that there are glide time nodes repeatedly collected and recorded at vehicle speed recording points corresponding to 50km/h to 45km/h and 45km/h to 40km/h, and at this time, a glide phase with a vehicle speed greater than 50km/h is taken as a high-speed glide phase, that is, a glide phase of 100km/h to 55km/h in table 1 is taken as a high-speed glide phase; and taking the sliding stage with the vehicle speed less than 40km/h as a low-speed sliding stage, namely taking the sliding stage with the vehicle speed of 35km/h to 0km/h in the table 1 as the low-speed sliding stage. Taking the sliding stage of 50km/h to 40km/h as a repeated sliding stage, removing the weight of the repeated sliding stage, combining the repeated sliding stage and the high-speed sliding stage, and joining the high-speed sliding stage and the low-speed sliding stage to obtain a whole continuous sliding stage.
In the embodiment of the invention, the number of the repeated sliding stages is not limited, and more than 1 repeated sliding stage can be selected to adapt to the limitation of the road sliding resistance of the vehicle type to be tested and the length of the test road, or other limitation conditions influencing the accuracy of the final road sliding resistance coefficient. Similarly, in the embodiment of the invention, only the test method for adaptively adjusting the road sliding resistance and the test road length of the vehicle type to be tested is adopted, but the limit condition influencing the accuracy of the final road sliding resistance coefficient is not limited, and the road sliding resistance test under other limit conditions can be realized.
And step S30, obtaining average sliding time nodes of all vehicle speed recording points according to the continuous sliding time nodes of the whole continuous sliding stage in the plurality of groups of tests, and calculating the average sliding time interval of the average sliding time nodes of the adjacent vehicle speed recording points.
And after the repeated sliding stage is subjected to de-duplication and combination and a high-speed sliding stage and a low-speed sliding stage are connected, a whole stage of continuous sliding is obtained. In a whole continuous sliding process, no sliding time node repeatedly acquired and recorded exists, and the corresponding vehicle speed does not exist. At this time, for a plurality of sets of tests in the same direction, each vehicle speed recording point corresponds to a plurality of continuous sliding time nodes in the plurality of sets of tests. In the present embodiment, since at least 6 sets of coasting times in the back-and-forth direction are included, a certain vehicle speed recording point should correspond to 6 continuous coasting time nodes. Since table 1 only intercepts two sets of tests for illustration, all in table 1, taking the 90km/h vehicle speed recording point as an example, the average sliding time of the 90km/h vehicle speed recording point is (21+19+20+20)/4 ═ 20 s.
The difference between the average sliding times corresponding to two adjacent vehicle speed recording points is the average sliding time interval, and similarly, taking table 1 as an example, the average sliding time of the 85km/h vehicle speed recording point is (25+23+25+23)/4 is 24s, so the average sliding time interval between the 90km/h vehicle speed recording point and the 85km/h vehicle speed recording point is 4 s.
And step S40, obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval, correcting by combining the environmental parameters, and fitting the corrected road sliding resistance and the vehicle speed corresponding to each vehicle speed recording point in the whole continuous sliding stage to obtain the final road sliding resistance coefficient.
After the average sliding time interval of the whole continuous sliding stage is obtained, the road sliding resistance of each vehicle speed recording point can be obtained by applying a formula according to the average sliding time interval among the vehicle speed recording points and the test quality in the test parameters. And then, applying another formula to the road sliding resistance by combining the environmental parameters to correct the road sliding resistance to obtain the corrected road sliding resistance. And performing fitting operation of a functional relation expression on the basis of the corrected road sliding resistance and the vehicle speed corresponding to each vehicle speed recording point in the whole continuous sliding stage to obtain final data: coefficient of road sliding resistance.
In this embodiment, test parameters obtained according to an actual test environment are obtained, where the test parameters include environment parameters and a plurality of sets of glide time nodes corresponding to respective vehicle speed recording points in the back-and-forth direction in the test. If the vehicle speed recording points with the same vehicle speed exist in a certain direction, the repeated sliding is automatically de-overlapped and becomes single sliding, and the whole continuous sliding in the direction is obtained by connection. And obtaining average sliding time according to the continuous sliding time nodes in the direction in multiple groups of tests, further obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval, and fitting the road sliding resistance after the environmental parameters are corrected and the corresponding vehicle speed to obtain a final road sliding resistance coefficient. By the method for testing the vehicle road sliding resistance, the obtained input only needs to be imported with the test parameters, and the strength is reduced by 80%; and the whole data calculation and processing process is automatically carried out for only 20 seconds, and the efficiency is improved by 30 times. Therefore, the time is saved, the workload is reduced, the problem of low efficiency of a data processing and analyzing process in the conventional sliding resistance testing process is solved, and the efficient vehicle road sliding resistance testing is realized.
Meanwhile, in the de-coincidence and connection process, repeated sliding is automatically de-coincident and becomes single sliding by averaging the sliding time intervals in the repeated sliding stage. In the whole continuous sliding stage in the multiple groups of tests, average sliding time nodes of all vehicle speed recording points are obtained by averaging all groups of continuous sliding time nodes, accurate average sliding time intervals of adjacent vehicle speed recording points are further calculated, and a final road sliding resistance coefficient is obtained according to the accurate average sliding time intervals. Therefore, the method for testing the vehicle road sliding resistance provided by the embodiment of the invention can reduce errors and improve the precision. Repeated testing caused by inaccurate data is avoided, and the efficiency of testing the vehicle road sliding resistance is improved from the side.
Optionally, after the step of determining whether there are vehicle speed recording points of the same vehicle speed, the method further includes:
and if the vehicle speed recording points with the same vehicle speed do not exist, directly taking the obtained sliding time nodes corresponding to the vehicle speed recording points as continuous sliding time nodes, and taking the sliding phase of the vehicle speed recording points without the same vehicle speed as the whole continuous sliding phase.
In an embodiment of the invention, if it is determined that there are no speed measurement recording points with the same speed, it indicates that the data recording of the sliding time node is completed by the vehicle adopting a period of continuous sliding, and no segmented test is performed, the sliding time node corresponding to each speed recording point can be directly extracted, and the sliding time node corresponding to each speed recording point is the continuous sliding time node, so as to calculate the average sliding time interval, and finally obtain the road sliding resistance coefficient corresponding to each speed recording point in the continuous sliding.
In this embodiment, for the case that the road sliding resistance of the vehicle type to be tested is large or the test road length is sufficient, the test is performed by using one-time continuous sliding without segmentation, and the final road sliding resistance coefficient can be obtained according to one-time continuous sliding. Therefore, the test requirements under different test environments are met, and the purpose of solving the final road sliding resistance coefficient can be achieved.
Optionally, the repeated coasting phase is at least divided into a first repeated coasting phase and a second repeated coasting phase, the vehicle speed corresponding to the vehicle speed recording points of the first repeated coasting phase and the second repeated coasting phase is the same, but the coasting time nodes corresponding to the vehicle speed recording points are different,
the step of automatically de-registering and becoming a single taxi phase includes:
obtaining a sliding time interval according to sliding time nodes corresponding to adjacent vehicle speed recording points in the vehicle speed recording points with the same vehicle speed, and averaging the sliding time intervals of the first repeated sliding stage and the second repeated sliding stage to obtain a target sliding time interval between the adjacent vehicle speed recording points;
and keeping the sliding time node corresponding to the highest vehicle speed recording point in the first repeated sliding stage unchanged, and obtaining a new sliding time node in the single sliding stage by taking the target sliding time interval as a new time interval, thereby completing duplication elimination and combination of the repeated sliding stages.
In an embodiment of the present invention, table 1 is also used as an example for description. As can be seen from Table 1, the coasting phase of 50km/h to 40km/h is a repeated coasting phase, wherein the repeated coasting phase connected to 100km/h to 55km/h is a first repeated coasting phase, and the repeated coasting phase connected to 35km/h to 0km/h is a second repeated coasting phase. In the repeated coasting period, two adjacent vehicle speed recording points, such as 50km/h and 45km/h, are selected. Then, obtaining a sliding time interval according to sliding time nodes corresponding to two adjacent vehicle speed recording points, taking the first group in the direction from south to north in table 1 as an example, and the specific processing process is as follows: at a 50km/h vehicle speed recording point of a first repeated coasting stage after the high-speed coasting stage, the coasting time node is 65s, at a 45km/h vehicle speed recording point of the first repeated coasting stage after the high-speed coasting stage, the coasting time node is 74s, and the coasting time interval of the first repeated coasting stage is 74-65-9 s; and at a vehicle speed recording point 50km/h in the second repeated coasting stage before the low-speed coasting stage, the coasting time node is 0s, at a vehicle speed recording point 45km/h in the second repeated coasting stage before the low-speed coasting stage, the coasting time node is 21s, and the coasting time interval of the second repeated coasting stage is 21-0 to 21 s. In table 1 of the embodiment of the present invention, in the same coasting phase of 50km/h to 45km/h, the coasting time interval of the first repeated coasting phase is 9s, and the coasting time interval of the second repeated coasting phase is 21s, which are different from each other by about 3s, and are not different from each other by as much as 12s, and the coasting time nodes are provided only for illustration. And taking the average value (21+9)/2 of the two sliding time intervals as 15s, and taking the target sliding time interval between the vehicle speed recording points of 50km/h and 45km/h of the repeated sliding stage.
Keeping the highest vehicle speed recording point of the first repeated coasting stage after the high-speed coasting stage, namely the coasting time node 65s corresponding to the 50km/h vehicle speed recording point unchanged, and taking the target coasting time interval 15s as a new time interval to obtain a new coasting time node 65+15 of the single coasting stage after the duplication elimination and combination as 80 s. And by adopting the same method, all the multi-section sliding stages in the back-and-forth direction in the multiple groups of tests are subjected to de-coincidence, so that the sliding stages of the multiple groups of tests are finally changed into the whole continuous sliding.
It can also be known that the number of the vehicle speed recording points corresponding to the repeated coasting phase is at least 2, but not only 1, otherwise, the target coasting time interval cannot be obtained to automatically connect the high-speed coasting phase and the low-speed coasting phase, and the subsequent step of obtaining the final road coasting resistance coefficient cannot be realized. The requirement that at least 2 vehicle speed recording points are needed in the repeated sliding stage can be understood as that the vehicle speed recording point with the higher speed is the connecting point in the high-speed sliding stage, and the vehicle speed recording point with the lower speed is the connecting point in the low-speed sliding stage, so that the whole continuous sliding is obtained.
Optionally, the step of obtaining the whole continuous sliding stage by linking comprises:
keeping a sliding time node and a sliding time interval corresponding to each vehicle speed recording point in a high-speed sliding stage unchanged, wherein the speed corresponding to each vehicle speed recording point in the high-speed sliding stage is higher than the speed corresponding to the vehicle speed recording point with the highest speed in the repeated sliding stage, and sliding in a first repeated sliding stage after the high-speed sliding stage;
and updating the sliding time nodes corresponding to the vehicle speed recording points in the low-speed sliding stage, wherein the speed corresponding to each vehicle speed recording point in the low-speed sliding stage is lower than the speed corresponding to the vehicle speed recording point with the lowest speed in the repeated sliding stage, and sliding in the second repeated sliding stage is performed before the low-speed sliding stage.
In an embodiment of the present invention, table 1 is also used as an example for description. In table 1, the vehicle speed of 100km/h to 55km/h is a high-speed coasting stage, and the coasting time node and the coasting time interval corresponding to each vehicle speed recording point in the high-speed coasting stage are not changed and are kept unchanged.
And in the low-speed sliding stage with the vehicle speed of 35km/h to 0km/h, only the sliding time nodes corresponding to the vehicle speed recording points in the low-speed sliding stage need to be updated, the sliding time intervals among the vehicle speed recording points in the low-speed sliding stage do not need to be updated, and the updating of the sliding time nodes is completed after the single sliding stage which is subjected to de-coincidence and connection is continued.
Optionally, the step of updating the coasting time node corresponding to each vehicle speed record point in the low-speed coasting phase includes:
and keeping the sliding time interval of the low-speed sliding stage before the connection unchanged on the basis of the sliding time node corresponding to the vehicle speed recording point of the lowest vehicle speed in the repeated sliding stage after the duplication removal and combination, and finishing the updating of the sliding time node in the low-speed sliding stage.
In an embodiment of the present invention, table 1 is also used as an example for description. In table 1, in the first group of south-to-north directions, the automatically calculated glide time interval between the vehicle speed recording points in the low-speed glide phase is specifically: 40km/h to 35km/h for 11 s; 35km/h to 30km/h for 11 s; 30km/h to 25km/h for 13 s; 25km/h to 20km/h,14s, and so on.
And keeping the sliding time interval (11s, 13s, 14s and the like) of the low-speed sliding stage before the connection unchanged on the basis of the sliding time node 89s corresponding to the vehicle speed recording point 40km/h of the lowest vehicle speed of the repeated sliding stage after updating. And obtaining the sliding time node corresponding to the 35km/h vehicle speed recording point in the low-speed sliding stage after linkage as 89+ 11-100 s, the sliding time node corresponding to the 30km/h vehicle speed recording point as 100+ 11-111 s, the sliding time node corresponding to the 25km/h vehicle speed recording point as 111+ 13-124 s, the sliding time node corresponding to the 20km/h vehicle speed recording point as 124+ 14-138 s, and the like, and finishing the updating of the sliding time node of the low-speed sliding stage.
Optionally, the step of obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval includes:
and obtaining the road sliding resistance corresponding to each speed recording point according to the average sliding time interval of each speed recording point in the multiple groups of road sliding resistance tests and the quality of the tested vehicle.
And after acquiring continuous sliding time nodes acquired after one-section sliding or continuous sliding time nodes obtained by automatic de-coincidence and post-connection according to multiple sections of repeated sliding, averaging all the continuous sliding time nodes of each vehicle speed recording point in all the test groups to obtain the average sliding time.
And obtaining the road sliding resistance corresponding to each vehicle speed recording point by using the average sliding time interval of each vehicle speed recording point and the tested vehicle mass according to the formula CC4.3.1.4.4 in GB 18352.6-2016, wherein the difference of the average sliding time corresponding to two adjacent vehicle speed recording points is the average sliding time interval.
Optionally, the step of correcting in combination with the environmental parameter includes:
and correcting the road sliding resistance according to the environmental parameters to obtain the corrected road sliding resistance corresponding to each vehicle speed recording point.
Similarly, the corrected road sliding resistance of each vehicle speed recording point can be obtained after the environmental parameters are corrected according to the formula in CC4.5 in GB 18352.6-2016, namely the road sliding resistance obtained by the formula in CC4.3.1.4.4 in GB 18352.6-2016 is combined with the test vehicle mass, wind speed, air temperature, humidity and air pressure.
Optionally, the step of fitting the corrected road sliding resistance and the vehicle speed corresponding to each vehicle speed record point in the whole continuous sliding stage to obtain a final road sliding resistance coefficient includes:
and fitting and calculating the vehicle speed corresponding to each vehicle speed recording point and the corrected road sliding resistance by adopting a functional relation expression Fnew of the vehicle speed and the road sliding resistance, wherein F0, F1 and F2 are final road sliding resistance coefficients.
Fitting and calculating each vehicle speed recording point and the road sliding resistance after corresponding correction by using a quadratic polynomial to obtain a functional relation expression F corresponding to the vehicle speed and the road sliding resistancenew＝F0+F1×v+F2×v2And F0, F1 and F2 are the final road sliding resistance coefficient of the vehicle to be tested, and v is the vehicle speed corresponding to a certain vehicle speed recording point. The embodiment of the invention adopts a functional relation expression F commonly used in the industrynew＝F0+F1×v+F2×v2The embodiment of the invention does not limit the expression of the relationship of the resistance function obtained by the speed and the sliding resistance. After obtaining F0, F1 and F2, namely the final road sliding resistance coefficient of the vehicle to be tested, the method can be used for testing the road sliding resistance of the vehicleSo as to directly obtain the road sliding resistance of the vehicle at the vehicle speed according to the vehicle speed.
In practical application, a certain vehicle speed under an actual environment is obtained by using a fitted functional relational expression with coefficients of road sliding resistance of F0, F1 and F2, namely the road sliding resistance corresponding to the vehicle speed can be obtained and is used as a reference resistance. And (4) making adaptive adjustment on the reference resistance according to the difference between the actual environment and the test environment to obtain the final accurate resistance under the corresponding vehicle speed.
In addition, an embodiment of the present invention further provides a device for testing a vehicle road sliding resistance, where the device for testing a vehicle road sliding resistance includes: the device comprises a memory, a processor and a test program of the vehicle road sliding resistance, wherein the test program of the vehicle road sliding resistance is stored on the memory and can run on the processor, and when being executed by the processor, the test program of the vehicle road sliding resistance realizes the steps of the test method of the vehicle road sliding resistance.
Furthermore, an embodiment of the present invention further provides a computer-readable storage medium, on which a test program of vehicle road sliding resistance is stored, and when the test program of vehicle road sliding resistance is executed by a processor, the steps of the test method of vehicle road sliding resistance are implemented as described above.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for testing the road sliding resistance of a vehicle is characterized by comprising the following steps:
obtaining test parameters of a vehicle for carrying out a plurality of groups of road sliding resistance tests in an actual test environment, wherein the test parameters comprise environment parameters and sliding time nodes corresponding to each speed recording point in the plurality of groups of road sliding resistance tests;
judging whether vehicle speed recording points with the same vehicle speed exist or not, if so, automatically de-superposing repeated sliding stages corresponding to the vehicle speed recording points with the same vehicle speed and forming a single sliding stage, thereby obtaining a whole continuous sliding stage by linking;
obtaining the average sliding time node of each vehicle speed recording point according to the continuous sliding time nodes of the whole continuous sliding stage in a plurality of groups of tests, and calculating the average sliding time interval of the average sliding time nodes of adjacent vehicle speed recording points;
and obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval, correcting by combining the environmental parameters, and fitting the corrected road sliding resistance and the vehicle speed corresponding to each vehicle speed recording point in the whole continuous sliding stage to obtain a final road sliding resistance coefficient.
2. The method for testing road sliding resistance of a vehicle according to claim 1, wherein after the step of determining whether there are vehicle speed recording points with the same vehicle speed, the method further comprises:
and if the vehicle speed recording points with the same vehicle speed do not exist, directly taking the obtained sliding time nodes corresponding to the vehicle speed recording points as continuous sliding time nodes, and taking the sliding phase of the vehicle speed recording points without the same vehicle speed as the whole continuous sliding phase.
3. The method for testing vehicle road sliding resistance according to claim 1, wherein the repeated sliding phase is divided into at least a first repeated sliding phase and a second repeated sliding phase, the vehicle speed corresponding to the vehicle speed recording points of the first repeated sliding phase and the second repeated sliding phase is the same, but the sliding time nodes corresponding to the vehicle speed recording points are different,
the step of automatically de-registering and becoming a single taxi phase includes:
obtaining a sliding time interval according to sliding time nodes corresponding to adjacent vehicle speed recording points in the vehicle speed recording points with the same vehicle speed, and averaging the sliding time intervals of the first repeated sliding stage and the second repeated sliding stage to obtain a target sliding time interval between the adjacent vehicle speed recording points;
and keeping the sliding time node corresponding to the highest vehicle speed recording point in the first repeated sliding stage unchanged, and obtaining a new sliding time node in the single sliding stage by taking the target sliding time interval as a new time interval, thereby completing duplication elimination and combination of the repeated sliding stages.
4. A method for testing the road sliding resistance of a vehicle as claimed in claim 1, wherein the step of obtaining the whole continuous sliding phase comprises:
keeping a sliding time node and a sliding time interval corresponding to each vehicle speed recording point in a high-speed sliding stage unchanged, wherein the speed corresponding to each vehicle speed recording point in the high-speed sliding stage is higher than the speed corresponding to the vehicle speed recording point with the highest speed in the repeated sliding stage, and sliding in a first repeated sliding stage after the high-speed sliding stage;
and updating the sliding time nodes corresponding to the vehicle speed recording points in the low-speed sliding stage, wherein the speed corresponding to each vehicle speed recording point in the low-speed sliding stage is lower than the speed corresponding to the vehicle speed recording point with the lowest speed in the repeated sliding stage, and sliding in the second repeated sliding stage is performed before the low-speed sliding stage.
5. The method for testing the road sliding resistance of the vehicle according to claim 4, wherein the step of updating the sliding time node corresponding to each vehicle speed recording point in the low-speed sliding stage comprises the following steps:
and keeping the sliding time interval of the low-speed sliding stage before the connection unchanged on the basis of the sliding time node corresponding to the vehicle speed recording point of the lowest vehicle speed in the repeated sliding stage after the duplication removal and combination, and finishing the updating of the sliding time node in the low-speed sliding stage.
6. The method for testing road sliding resistance of a vehicle according to claim 1, wherein the step of obtaining the road sliding resistance of each vehicle speed recording point according to the average sliding time interval comprises the following steps:
and obtaining the road sliding resistance corresponding to each speed recording point according to the average sliding time interval of each speed recording point in the multiple groups of road sliding resistance tests and the quality of the tested vehicle.
7. A method of testing the road planing resistance of a vehicle according to claim 6, wherein the step of modifying in combination with the environmental parameter comprises:
and correcting the road sliding resistance according to the environmental parameters to obtain the corrected road sliding resistance corresponding to each vehicle speed recording point.
8. The method for testing road sliding resistance of a vehicle according to claim 1, wherein the step of fitting the corrected road sliding resistance and the vehicle speed corresponding to each vehicle speed record point of the whole continuous sliding stage to obtain the final road sliding resistance coefficient comprises the following steps:
adopting a functional relation expression F of vehicle speed and road sliding resistancenew＝F0+F1×v+F2×v2And performing fitting calculation on the vehicle speed corresponding to each vehicle speed recording point and the corrected road sliding resistance, wherein F0, F1 and F2 are final road sliding resistance coefficients.
9. A test apparatus for a vehicle road skid resistance, characterized by comprising: memory, a processor and a test program of vehicle road skid resistance stored on the memory and executable on the processor, the test program of vehicle road skid resistance implementing the steps of the test method of vehicle road skid resistance according to any of claims 1 to 8 when executed by the processor.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a test program of vehicle road skid resistance, which when executed by a processor implements the steps of the test method of vehicle road skid resistance according to any one of claims 1 to 8.
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| CN202111337431.3A CN114117255A (en) | 2021-11-12 | 2021-11-12 | Method and device for testing vehicle road sliding resistance and storage medium |
| PCT/CN2022/131531 WO2023083332A1 (en) | 2021-11-12 | 2022-11-11 | Vehicle on-road coasting resistance measurement method and device, and storage medium |
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| WO2023083332A1 (en) * | 2021-11-12 | 2023-05-19 | 上汽通用五菱汽车股份有限公司 | Vehicle on-road coasting resistance measurement method and device, and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR0157738B1 (en) * | 1995-02-10 | 1999-03-30 | 김은영 | Method for measuring automobile motion resistance using distance-time inertia travelling test |
| CN111024404A (en) * | 2018-10-09 | 2020-04-17 | 上海汽车集团股份有限公司 | Method, device, equipment and system for measuring vehicle road resistance |
| CN112098112A (en) * | 2020-08-25 | 2020-12-18 | 中国第一汽车股份有限公司 | Test method for optimizing road load test |
| CN112033697A (en) * | 2020-09-07 | 2020-12-04 | 东风汽车集团有限公司 | Wind resistance analysis method based on road sliding resistance test |
| CN114117255A (en) * | 2021-11-12 | 2022-03-01 | 上汽通用五菱汽车股份有限公司 | Method and device for testing vehicle road sliding resistance and storage medium |
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| WO2023083332A1 (en) * | 2021-11-12 | 2023-05-19 | 上汽通用五菱汽车股份有限公司 | Vehicle on-road coasting resistance measurement method and device, and storage medium |
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