Brake test wheel load determination method in heavy duty vehicle brake emission test

Abstract

The invention relates to the technical field of wheel load calculation, in particular to a brake test wheel load determination method in a heavy duty vehicle brake emission test, and the method comprises the steps: determining a driving resistance coefficient recommendation value corresponding to a target heavy duty vehicle in all brake emission test tasks; calculating a total road driving resistance acting ratio of the target heavy vehicle in all brake emission test tasks based on the driving resistance coefficient recommendation value; and calculating brake test wheel loads of the target heavy-duty vehicle in all brake emission test tasks based on the total road driving resistance acting ratio and the wheel rated load of the target heavy-duty vehicle. Therefore, the problems that the test wheel load of the test brake sample cannot be determined when different types of heavy duty vehicles are subjected to brake emission tests under different brake emission test cycles, the implementation process is relatively complex, the actual brake emission result of the brake is very easy to appear, a large amount of time, manpower and material resources are wasted and the like in the prior art are solved.

Description

Technical Field

[0001] The present application relates to the technical field of wheel load calculation, and particularly relates to a method for determining the test wheel load of a brake in a heavy vehicle brake emission test. Background Art

[0002] With the continuous tightening of vehicle emission regulations, while the particulate matter in vehicle exhaust emissions has been reduced, the problem of non-exhaust particulate matter emissions has become increasingly prominent. Among non-exhaust emissions, brake wear particles dominate, especially in urban areas and near busy roads. Under the requirements of national regulations and the pressure of energy conservation and environmental protection, carrying out vehicle brake emission research is also the focus of the next stage of work in the vehicle industry. During the braking process of a vehicle, its total kinetic energy loss is the sum of the work done by the road driving resistance and the work done by the brake friction braking. Since the test wheel load of the test brake sample will affect the braking intensity of the brake, vehicle brake emissions are closely related to the test wheel load of the test brake sample. Therefore, whether the reduction of the test wheel load caused by the vehicle road driving resistance is considered in the test will affect the detection result of brake particulate emissions.

[0003] In related technologies, the test wheel load can be determined by the brake emission detection method for light vehicles in UN GTRs (The United Nations Global Technical Regulations), that is, based on the proportion of the work done by the road driving resistance in the total resistance work, so as to reflect the road load loss during the actual road braking process of the vehicle; or the number of wheel hub fatigue damages can be determined according to the radial load, lateral load and driving distance in each load interval, and then the test load spectrum of the wheel biaxial fatigue test can be determined in combination with the number of wheel hub fatigue damages.

[0004] However, in related technologies, it is impossible to determine the test wheel load of the test brake sample when different types of heavy vehicles conduct brake emission tests under different brake emission test cycles, and the implementation process is relatively complex. The actual brake emission results of the brake are likely to occur, wasting a large amount of time, manpower and material resources, and there is an urgent need for improvement. Summary of the Invention

[0005] The present application provides a method for determining the test wheel load of a brake in a heavy vehicle brake emission test, so as to solve the problems in related technologies that it is impossible to determine the test wheel load of the test brake sample when different types of heavy vehicles conduct brake emission tests under different brake emission test cycles, the implementation process is relatively complex, the actual brake emission results of the brake are likely to occur, and a large amount of time, manpower and material resources are wasted.

[0006] The first aspect embodiment of the present application provides a method for determining the wheel load of a brake test in a heavy vehicle brake emission test, including the following steps: determining the recommended value of the driving resistance coefficient corresponding to the target heavy vehicle in all brake emission test tasks; calculating the proportion of the total road driving resistance work of the target heavy vehicle in all brake emission test tasks based on the recommended value of the driving resistance coefficient; calculating the wheel load of the brake test of the target heavy vehicle in all brake emission test tasks based on the proportion of the total road driving resistance work and the rated wheel load of the target heavy vehicle.

[0007] Through the above technical solution, the recommended value of the driving resistance coefficient corresponding to the target heavy vehicle in all brake emission test tasks can be determined first, and then the proportion of the total road driving resistance work can be calculated based on the recommended value of the driving resistance coefficient, so as to calculate the test wheel load according to the rated wheel load. By calculating the proportion of the total road driving resistance in the total resistance work under the brake emission test tasks in a specific brake emission test cycle of the target heavy vehicle, it covers all types of target heavy vehicles and different brake emission test cycles, and can truly reflect the situation that the actual wheel load borne by the brake is reduced due to the influence of the road driving resistance when the target heavy vehicle operates this brake emission test cycle on the actual road. Furthermore, it ensures the authenticity and accuracy of the brake emission test results, greatly improves the efficiency, and reduces the cost.

[0008] Optionally, in an embodiment of the present application, the calculating the proportion of the total road driving resistance work of the target heavy vehicle in all brake emission test tasks based on the recommended value of the driving resistance coefficient includes: calculating the road driving resistance of the target heavy vehicle at different vehicle speeds in each brake emission test task based on the recommended value of the driving resistance coefficient; calculating the single road driving resistance work done by the road driving resistance in each brake emission test task based on the road driving resistance, and calculating the total road driving resistance work of the target heavy vehicle in all brake emission test tasks based on the single road driving resistance work; calculating the single resistance work done by the resistance of the target heavy vehicle based on the initial braking speed and the final braking speed of the target heavy vehicle in each brake emission test task, and calculating the total resistance work of the target heavy vehicle in all brake emission test tasks based on the single resistance work; calculating the proportion of the total road driving resistance work in the total resistance work based on the total road driving resistance work and the total resistance work.

[0009] Through the above technical solution, the road driving resistance can be calculated based on the recommended value of the driving resistance coefficient, and the total road driving resistance work can be calculated according to the road driving resistance. Furthermore, the proportion of the total road driving resistance work in the total resistance work can be calculated in combination with the total resistance work, ensuring the accuracy of the subsequent calculated single road driving resistance work and total road driving resistance work, helping to more accurately evaluate the energy consumption of the target heavy vehicle during actual road driving, and more comprehensively understand the overall energy consumption of the target heavy vehicle during the braking emission test task, providing strong support for optimizing the design and performance of heavy vehicles.

[0010] Optionally, in an embodiment of the present application, calculating the proportion of the total road driving resistance work in the total resistance work based on the total road driving resistance work and the total resistance work includes: calculating the proportion of the single road driving resistance work in the single resistance work based on the single road driving resistance work and the single resistance work; calculating the proportion of the total road driving resistance work based on the proportion of the single road driving resistance work.

[0011] Through the above technical solution, the proportion of the single road driving resistance work can be calculated according to the single road driving resistance work and the single resistance work, and then the proportion of the total road driving resistance work can be calculated. By refining the calculation process into the proportion calculation in a single braking emission test task, the contribution of the road driving resistance to the total resistance in each braking emission test task can be analyzed more carefully, so as to optimize targeted, improve the accuracy of the calculation, and adjust the calculation method or parameter settings according to different test requirements or standards, which helps to adapt to different test scenarios and heavy vehicle types.

[0012] Optionally, in an embodiment of the present application, the calculation formula for the brake test wheel load can be, but is not limited to:

[0013] W t =W n ×(1 - P),

[0014] where W t is the test wheel load, kg; W n is the wheel rated load, kg.

[0015] Through the above technical solution, the wheel rated load can be used as the calculation basis to ensure that the test wheel load matches the maximum load actually borne by the wheel, thereby simulating real road driving conditions, helping to accurately evaluate the performance of the wheel during the test, ensuring the reliability and accuracy of the test results, and a reasonable calculation formula for the test wheel load can ensure that the wheel will not be damaged due to excessive load during the test, thus ensuring the safety of the test personnel and the integrity of the test equipment.

[0016] Optionally, in an embodiment of the present application, the calculation formula for the proportion of the work done by the total road driving resistance may be, but is not limited to:

[0017]

[0018] where P is the proportion of the work done by the road driving resistance; P oi is the proportion of the work done in a single braking emission test task, P o1 represents the proportion of the work done by the road driving resistance in the first braking emission test task, P On represents the proportion of the work done by the road driving resistance in the last braking emission test task, and so on; n is the number of braking emission test tasks in the braking emission test cycle.

[0019] Through the above technical solution, the proportion of the work done by the total road driving resistance can be calculated based on the proportion of the work done by the single road driving resistance. By comprehensively considering the proportion of the work done by the road driving resistance in all braking emission test tasks, the overall performance of the target heavy-duty vehicle in the braking emission test cycle can be comprehensively and comprehensively evaluated, which helps to more accurately understand the energy consumption of the target heavy-duty vehicle under different test conditions, improve the calculation accuracy, and support multi-scenario applications.

[0020] An embodiment of the second aspect of the present application provides a device for determining the wheel load of a brake in a heavy-duty vehicle braking emission test, including: a determination module for determining a recommended value of the driving resistance coefficient corresponding to the target heavy-duty vehicle in all braking emission test tasks; a first calculation module for calculating the proportion of the work done by the total road driving resistance of the target heavy-duty vehicle in all the braking emission test tasks based on the recommended value of the driving resistance coefficient; and a second calculation module for calculating the wheel load of the brake test of the target heavy-duty vehicle in all the braking emission test tasks based on the proportion of the work done by the total road driving resistance and the rated wheel load of the target heavy-duty vehicle.

[0021] Through the above technical solution, the recommended value of the driving resistance coefficient corresponding to the target heavy-duty vehicle in all braking emission test tasks can be determined first, and then the proportion of the work done by the total road driving resistance can be calculated based on the recommended value of the driving resistance coefficient, so as to calculate the test wheel load according to the rated wheel load. By calculating the proportion of the total road driving resistance in the total resistance work in the braking emission test tasks in a specific braking emission test cycle of the target heavy-duty vehicle, it covers all types of target heavy-duty vehicles and different braking emission test cycles, and can truly reflect the situation that the actual wheel load borne by the brake is reduced due to the influence of the road driving resistance when the target heavy-duty vehicle actually runs this braking emission test cycle on the road. Furthermore, it ensures the authenticity and accuracy of the braking emission test results, greatly improves the efficiency, and reduces the cost.

[0022] Optionally, in an embodiment of the present application, the first calculation module includes: a first calculation unit configured to calculate the road running resistance of the target heavy-duty vehicle at different vehicle speeds in each braking emission test task based on the recommended value of the running resistance coefficient; a second calculation unit configured to calculate the single road running resistance work done by the road running resistance in each braking emission test task based on the road running resistance, and calculate the total road running resistance work of the target heavy-duty vehicle in all braking emission test tasks based on the single road running resistance work; a third calculation unit configured to calculate the single resistance work done by the resistance of the target heavy-duty vehicle based on the initial braking speed and the final braking speed of the target heavy-duty vehicle in each braking emission test task, and calculate the total resistance work of the target heavy-duty vehicle in all braking emission test tasks based on the single resistance work; a fourth calculation unit configured to calculate the proportion of the total road running resistance work in the total resistance work based on the total road running resistance work and the total resistance work.

[0023] Through the above technical solution, the road running resistance can be calculated based on the recommended value of the running resistance coefficient, the total road running resistance work can be calculated according to the road running resistance, and then the proportion of the total road running resistance work in the total resistance work can be calculated in combination with the total resistance work, ensuring the accuracy of the single road running resistance work and the total road running resistance work in the subsequent calculation, helping to more accurately evaluate the energy consumption of the target heavy-duty vehicle during actual road running, and more comprehensively understand the overall energy consumption of the target heavy-duty vehicle in the braking emission test task, providing strong support for optimizing the design and performance of heavy-duty vehicles.

[0024] Optionally, in an embodiment of the present application, the fourth calculation unit includes: a first calculation subunit configured to calculate the proportion of the single road running resistance work in the single resistance work based on the single road running resistance work and the single resistance work; a second calculation subunit configured to calculate the proportion of the total road running resistance work based on the proportion of the single road running resistance work.

[0025] Through the above technical solution, the proportion of the single road running resistance work can be calculated according to the single road running resistance work and the single resistance work, and then the proportion of the total road running resistance work can be calculated. By refining the calculation process into the proportion calculation in a single braking emission test task, the contribution of the road running resistance to the total resistance in each braking emission test task can be analyzed more carefully, so as to optimize targeted, improve the calculation accuracy, and adjust the calculation method or parameter settings according to different test requirements or standards, which helps to adapt to different test scenarios and heavy-duty vehicle types.

[0026] Optionally, in an embodiment of the present application, the calculation formula of the brake test wheel load can be but is not limited to:

[0027] W t = W n × (1 - P),

[0028] wherein, W t is the test wheel load, in kg; W n is the rated wheel load, in kg.

[0029] Through the above technical solution, the rated wheel load can be used as the calculation basis to ensure that the test wheel load matches the maximum load actually borne by the wheel, thereby simulating real road driving conditions, which helps to accurately evaluate the performance of the wheel during the test and ensure the reliability and accuracy of the test results. A reasonable test wheel load calculation formula can ensure that the wheel will not be damaged due to excessive load during the test, thus ensuring the safety of the test personnel and the integrity of the test equipment.

[0030] Optionally, in an embodiment of the present application, the calculation formula of the proportion of the total road driving resistance work can be but is not limited to:

[0031]

[0032] wherein, P is the proportion of the road driving resistance work; P Oi is the proportion of the work of a single brake emission test task, P O1 represents the proportion of the road driving resistance work of the first brake emission test task, P On represents the proportion of the road driving resistance work of the last brake emission test task, and so on; n is the number of brake emission test tasks in the brake emission test cycle.

[0033] Through the above technical solution, the proportion of the total road driving resistance work can be calculated based on the proportion of the single road driving resistance work. By comprehensively considering the proportion of the road driving resistance work in all brake emission test tasks, the overall performance of the target heavy vehicle in the brake emission test cycle can be comprehensively and overall evaluated, which helps to more accurately understand the energy consumption of the target heavy vehicle under different test conditions, improve the calculation accuracy, and support multi-scenario applications.

[0034] An embodiment of the third aspect of the present application provides a heavy vehicle, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. The processor executes the program to implement the method for determining the test wheel load of the brake in the heavy vehicle brake emission test as described in the above embodiment.

[0035] In a fourth aspect embodiment of the present application, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, and when the program is executed by a processor, it implements the method for determining the wheel load of the brake test in the heavy vehicle brake emission test as described above.

[0036] In a fifth aspect embodiment of the present application, a computer program product is provided, including a computer program, and when the program is executed, it implements the method for determining the wheel load of the brake test in the heavy vehicle brake emission test as described above.

[0037] The embodiments of the present application can first determine the recommended value of the driving resistance coefficient corresponding to the target heavy vehicle in all brake emission test tasks, and then calculate the proportion of the total road driving resistance work based on the recommended value of the driving resistance coefficient, so as to calculate the wheel load of the brake test according to the rated wheel load. By calculating the proportion of the total road driving resistance in the total resistance work under the brake emission test task in a specific brake emission test cycle of the target heavy vehicle, it covers all types of target heavy vehicles and different brake emission test cycles, and can truly reflect the situation that the actual wheel load borne by the brake is reduced due to the influence of the road driving resistance when the target heavy vehicle operates on the actual road in this brake emission test cycle. Furthermore, it ensures the authenticity and accuracy of the brake emission test results, greatly improves the efficiency, and reduces the cost. Thus, it solves the problems in the related art that it is impossible to determine the wheel load of the test brake sample when different types of heavy vehicles conduct brake emission tests under different brake emission test cycles, and the implementation process is relatively complex, and the actual brake emission results of the brake are likely to occur, wasting a large amount of time, manpower, material resources, etc.

[0038] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings, where:

[0040] Figure 1 FIG. is a flowchart of a method for determining the wheel load of the brake test in a heavy vehicle brake emission test according to an embodiment of the present application;

[0041] Figure 2 FIG. is a flowchart of the working principle of a method for determining the wheel load of the brake test in a heavy vehicle brake emission test according to an embodiment of the present application;

[0042] Figure 3 FIG. is a block diagram of a calculation model of a method for determining the wheel load of the brake test in a heavy vehicle brake emission test according to an embodiment of the present application;

[0043] Figure 4 It is a block diagram of a device for determining the test wheel load of a brake in a heavy vehicle brake emission test according to an embodiment of the present application;

[0044] Figure 5 It is a structural diagram of a heavy vehicle according to an embodiment of the present application. Description of the drawings:

[0046] Among them, 30 is a calculation model for the method of determining the test wheel load of a brake in a heavy vehicle brake emission test; 301 is a basic parameter module, 302 is a coefficient access module, 303 is a single-road driving resistance work calculation module, 304 is a single resistance work calculation module, 305 is a work proportion calculation module, and 306 is a test wheel load calculation module; 40 is a device for determining the test wheel load of a brake in a heavy vehicle brake emission test; 100 is a determination module, 200 is a first calculation module, and 300 is a second calculation module; 501 is a memory, 502 is a processor, and 503 is a communication interface. Detailed implementation manners

[0047] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0048] The method for determining the test wheel load of the brake in the heavy vehicle brake emission test according to the embodiments of the present application will be described below with reference to the accompanying drawings. Aiming at the problem in the above-mentioned background technology that it is impossible to determine the test wheel load of the test brake sample when different types of heavy vehicles conduct brake emission tests under different brake emission test cycles, and the implementation process is relatively complex, and the actual brake emission results of the brake are likely to occur, wasting a large amount of time, manpower, and material resources, the present application provides a method for determining the test wheel load of the brake in the heavy vehicle brake emission test. In this method, the recommended value of the driving resistance coefficient corresponding to the target heavy vehicle in all brake emission test tasks can be determined first, and then the proportion of the total road driving resistance work in the total resistance work can be calculated based on the recommended value of the driving resistance coefficient. Thus, the test wheel load of the brake can be calculated according to the rated wheel load. By calculating the proportion of the total road driving resistance in the total resistance work in the brake emission test task under the specific brake emission test cycle of the target heavy vehicle, all types of target heavy vehicles and different brake emission test cycles are covered, which can truly reflect the situation that the actual wheel load borne by the brake is reduced due to the influence of the road driving resistance when the target heavy vehicle operates on the actual road in this brake emission test cycle. Furthermore, the authenticity and accuracy of the brake emission test results are ensured, the efficiency is greatly improved, and the cost is reduced. Thereby, the problems in the related technology that it is impossible to determine the test wheel load of the test brake sample when different types of heavy vehicles conduct brake emission tests under different brake emission test cycles, and the implementation process is relatively complex, and the actual brake emission results of the brake are likely to occur, wasting a large amount of time, manpower, and material resources are solved.

[0049] Specifically, Figure 1 FIG. is a flowchart of a method for determining the test wheel load of the brake in the heavy vehicle brake emission test according to the embodiments of the present application.

[0050] As Figure 1 shown, the method for determining the test wheel load of the brake in the heavy vehicle brake emission test includes the following steps:

[0051] In step S101, determine the recommended value of the driving resistance coefficient corresponding to the target heavy vehicle in all brake emission test tasks.

[0052] It can be understood that in the embodiments of the present application, the target heavy vehicle can be understood as a freight truck, a semi-trailer tractor, a dump truck, a regular bus, a city bus, etc. Moreover, the recommended values of the driving resistance coefficients for different types of target heavy vehicles are different, which can be obtained from Table 1 - Table 5 or by other means. Specifically, it can be set by those skilled in the art according to the actual situation, and the present application does not make specific limitations. Among them, Table 1 is a schematic table of the recommended values of the driving resistance coefficients for freight trucks provided according to an embodiment of the present application, Table 2 is a schematic table of the recommended values of the driving resistance coefficients for semi-trailer tractors provided according to an embodiment of the present application, Table 3 is a schematic table of the recommended values of the driving resistance coefficients for dump trucks provided according to an embodiment of the present application, Table 4 is a schematic table of the recommended values of the driving resistance coefficients for regular buses provided according to an embodiment of the present application, and Table 5 is a schematic table of the recommended values of the driving resistance coefficients for city buses provided according to an embodiment of the present application.

[0053] In addition, it should be noted that the braking emission test tasks in the embodiments of the present application have been carried out more than once. Specifically, it can be set by those skilled in the art according to the actual situation, and the present application does not make specific limitations.

[0054] As a possible implementation manner, the embodiments of the present application can determine the recommended values of the driving resistance coefficients corresponding to the target heavy vehicles in all braking emission test tasks through Table 1 - Table 5.

[0055] Table 1

[0056]

[0057]

[0058] Table 2

[0059]

[0060] Table 3

[0061]

[0062] Table 4

[0063]

[0064] Table 5

[0065]

[0066] For example, in the braking emission test task of the embodiments of the present application, the target heavy vehicle is an 18-ton city bus. The recommended value method of the driving resistance coefficient is used for calculation. Referring to Table 5, it can be known that the maximum designed total mass of the target vehicle in the embodiments of the present application is 18,000 kg. Among them, the constant term A is 966.9 N, the first-order term coefficient B is 4.24 N / (km / h), and the second-order term coefficient C is 0.203 N / (km / h). 2 .

[0067] In step S102, based on the recommended value of the driving resistance coefficient, calculate the proportion of the total road driving resistance work of the target heavy vehicle in all braking emission test tasks.

[0068] It can be understood that the proportion of the total road driving resistance work in the embodiments of the present application can be understood as the proportion of the total road driving resistance work in the total resistance work.

[0069] As a possible implementation manner, in all braking emission test tasks of the embodiments of the present application, the recommended value of the driving resistance coefficient can be used to calculate the proportion of the total road driving resistance work of the target heavy vehicle.

[0070] Optionally, in an embodiment of the present application, calculating the proportion of the total road driving resistance work of the target heavy vehicle in all braking emission test tasks based on the recommended value of the driving resistance coefficient includes: calculating the road driving resistance of the target heavy vehicle at different vehicle speeds in each braking emission test task based on the recommended value of the driving resistance coefficient; calculating the single road driving resistance work done by the road driving resistance in each braking emission test task based on the road driving resistance, and calculating the total road driving resistance work of the target heavy vehicle in all braking emission test tasks based on the single road driving resistance work; calculating the single resistance work done by the resistance of the target heavy vehicle based on the initial braking speed and the final braking speed of the target heavy vehicle in each braking emission test task, and calculating the total resistance work of the target heavy vehicle in all braking emission test tasks based on the single resistance work; calculating the proportion of the total road driving resistance work in the total resistance work based on the total road driving resistance work and the total resistance work.

[0071] Among them, the calculation formula of the proportion of the total road driving resistance work can be but not limited to:[[]]

[0072]

[0073] Among them, P is the proportion of the road driving resistance work; P Oi is the proportion of the work done in a single braking emission test task, P O1 represents the proportion of the road driving resistance work in the first braking emission test task, P OnIt represents the proportion of the work done by the road running resistance in the last braking emission test task, and so on; n is the number of braking emission test tasks in the braking emission test cycle.

[0074] In some embodiments, the road running resistance of the target heavy-duty vehicle in all braking emission test tasks can be determined as an alternative method according to the recommended values of the running resistance coefficient specified in Tables 1-5 to obtain the road running resistance at different vehicle speeds. Among them, in an embodiment of the present application, in a certain braking emission test task, the calculation formula of the road running resistance of the target heavy-duty vehicle at different vehicle speeds can be but is not limited to being expressed as:

[0075] F xi = A + B×v i + C×v i 2 , (1)

[0076] where, F xi is the road running resistance per second, N; A is the constant term, N; B is the first-order term coefficient, N / (km / h); C is the second-order term coefficient, N / (km / h) 2 ; v i is the vehicle speed, km / h.

[0077] Furthermore, in an embodiment of the present application, in a certain braking emission test task, the calculation formula of the work done by the road running resistance per second can be but is not limited to being expressed as:

[0078]

[0079] where, W si is the work done by the road running resistance per second, J; F xi is the road running resistance per second, N; s i is the braking distance per second, m; v 2i is the final braking speed per second, m / s; v 1i is the initial braking speed per second, m / s; a is the deceleration in a certain braking emission test task, m / s 2 .

[0080] It should be noted that in an embodiment of the present application, if the speed difference per second in a certain braking emission test task is less than 0.5 km / h, it may not be regarded as a single-segment braking emission test task, and it can be specifically set by those skilled in the art according to the actual situation, and the present application does not make specific limitations.

[0081] Furthermore, in an embodiment of the present application, the work done by the road running resistance in a certain braking emission test task includes multiple per-second brakings. Therefore, in an embodiment of the present application, the corresponding single road running resistance work can be obtained based on the work done by the road running resistance per second, and its calculation formula can be but is not limited to being expressed as:

[0082] W = W s1 + W s2 + W s3 +...... + W sn ,(3)

[0083] Among them, W is the work done by the road running resistance in a certain braking emission test task, J; W si is the work done by the road running resistance per second, J; W s1 represents the work done by the running resistance in the first second when the braking emission test task starts, W s2 represents the work done by the running resistance in the second second in this braking emission test task, and so on, W sn represents the work done by the running resistance in the last second when the braking emission test task ends.

[0084] Furthermore, the embodiments of the present application can calculate the total road running resistance work of the target heavy vehicle in all braking emission test tasks by combining formulas (1)-(3).

[0085] In addition, in a certain braking emission test task of the target heavy vehicle in the embodiments of the present application, the single resistance work can be calculated according to the initial braking speed and the final braking speed of the braking emission test task, and its calculation formula can be but is not limited to:

[0086]

[0087] Among them, W Z is the total resistance work in a certain braking emission test task, J; V 1 is the initial braking speed of a certain braking emission test task, m / s; V 2 is the final braking speed of a certain braking emission test task, m / s; GVW is the maximum designed total mass of the vehicle, kg.

[0088] Furthermore, the embodiments of the present application can calculate the total resistance work of the target heavy vehicle in all braking emission test tasks by using (4).

[0089] In some embodiments, after obtaining the total road running resistance work and the total resistance work, the embodiments of the present application can calculate the proportion of the total road running resistance work in the total resistance work. Among them, the calculation formula of the proportion of the total road running resistance work can be but is not limited to:

[0090]

[0091] Among them, P is the proportion of the road running resistance work; P Oi is the proportion of the work done in a single braking emission test task, P O1 represents the proportion of the road running resistance work in the first braking emission test task, POn It represents the proportion of the work done by the road running resistance in the last braking emission test task, and so on; n is the number of braking emission test tasks in the braking emission test cycle.

[0092] For example, in a certain braking emission test task of the embodiment of the present application, an 18-ton city bus can select operating conditions according to Table 6. Among them, serial numbers 1-10 are for braking emission test task 1, and serial numbers 14-29 are for braking emission test task 2. And a speed difference less than 0.5 km / h per second is considered not to be a braking emission test task. Among them, Table 6 is a schematic table for selecting operating conditions provided according to an embodiment of the present application.

[0093] Table 6

[0094] Serial number Vehicle speed (km / h) 1 22 2 21 3 20 4 19 5 18 6 17 7 16 8 15 9 14 10 13 11 13 12 13 13 13 14 13 15 10.8 16 8.6 17 6.4 18 4.2 19 2 20 0

[0095] Furthermore, in the embodiment of the present application, in combination with Table 6, the road running resistance per second is calculated using formula (1), and the calculation results are shown in Table 7; the single road running resistance work done by the road running resistance in each braking emission test task, that is, the work done by the road running resistance per second, is calculated using formula (2), and the calculation results are shown in Table 7; the single resistance work done by the target heavy vehicle resistance in each braking emission test task, that is, the driving resistance work in a single braking emission test task, is calculated using formula (3), and the calculation results are shown in Table 7; according to formula (4), the total resistance work (i.e., kinetic energy loss) is calculated. The total resistance work for braking emission test task 1 is 218750.00 J, and for braking emission test task 2 is 117361.11 J. Among them, Table 7 is a schematic table of the work calculation results provided according to an embodiment of the present application.

[0096] Table 7

[0097]

[0098] Optionally, in an embodiment of the present application, calculating the proportion of the total road running resistance work in the total resistance work based on the total road running resistance work and the total resistance work includes: calculating the proportion of the single road running resistance work in the single resistance work based on the single road running resistance work and the single resistance work; calculating the proportion of the total road running resistance work based on the proportion of the single road running resistance work.

[0099] Those skilled in the art can understand that the formula for calculating the proportion of the single road running resistance work in the single resistance work in a certain braking emission test task of the embodiment of the present application can be but is not limited to being expressed as:

[0100]

[0101] Among them, P Oi is the proportion of the work done by the single-road driving resistance in the single-resistance work for a certain braking emission test task; W is the work done by the single-road driving resistance for a certain braking emission test task, in J; W z is the single-resistance work for a certain braking emission test task, in J.

[0102] Furthermore, the embodiment of the present application can calculate the proportion of the total road driving resistance work based on the proportion of the single-road driving resistance work.

[0103] For example, the embodiment of the present application can calculate the proportion of the work done by the single-road driving resistance in the braking process of the braking emission test for a certain braking emission test task according to formula (6). Among them, in the braking emission test task 1 of the embodiment of the present application, the proportion of the work done by the single-road driving resistance is 22.28%, and in the braking emission test task 2, the proportion of the work done by the single-road driving resistance is 9.15%. Furthermore, the embodiment of the present application can calculate the proportion of the total road driving resistance work in the braking process of the braking emission test according to formula (5), and its value is 15.72%.

[0104] In step S103, based on the proportion of the total road driving resistance work and the wheel rated load of the target heavy vehicle, calculate the brake test wheel load of the target heavy vehicle in all braking emission test tasks. Among them, the calculation formula of the brake test wheel load can be but is not limited to:

[0105] W t = W n ×(1 - P),

[0106] Among them, W t is the test wheel load, in kg; W n is the wheel rated load, in kg.

[0107] As a possible implementation manner, the embodiment of the present application can calculate the brake test wheel load of the target heavy vehicle in all braking emission test tasks through the proportion of the total road driving resistance work and the wheel rated load. Among them, the calculation formula of the brake test wheel load can be but is not limited to:

[0108] W t = W n ×(1 - P), (7)

[0109] Among them, W t is the test wheel load, in kg; W n is the wheel rated load, in kg.

[0110] For example, in the braking emission test task of the embodiments of the present application, the rated wheel load is 5850 kg. Furthermore, in the braking emission test cycle of Table 6, the embodiments of the present application can calculate the test wheel load of the target heavy vehicle according to the known rated wheel load in combination with formula (7), and its value can be 4930.38 kg.

[0111] In summary, the target heavy vehicle of the embodiments of the present application can quickly obtain the test wheel load of the brake in the braking emission test task according to the recommended value of the driving resistance coefficient, solve the problem of the lack of a calculation method for the test wheel load of the braking emission test in target heavy vehicles at home and abroad, and can reflect the actual braking wear particulate matter emission situation of the target heavy vehicle during actual road driving.

[0112] Next, in conjunction with Figure 2 and Figure 3 as shown, the working principle of the method for determining the test wheel load of the brake in the heavy vehicle braking emission test proposed by the embodiments of the present application will be introduced with multiple embodiments.

[0113] Among them, Figure 2 is a flowchart of the working principle of the method for determining the test wheel load of the brake in the heavy vehicle braking emission test according to an embodiment of the present application.

[0114] Figure 3 is a block diagram of the calculation model of the method for determining the test wheel load of the brake in the heavy vehicle braking emission test according to an embodiment of the present application.

[0115] Step S201: Determine the recommended value of the driving resistance coefficient corresponding to the target heavy vehicle.

[0116] Among them, the embodiments of the present application can use the Figure 3 in the basic parameter module 301 to determine the different types of the target heavy vehicle, and then use the Figure 3 in the coefficient lookup module 302 to query Tables 1 - 5 to determine the corresponding recommended value of the driving resistance coefficient.

[0117] Step S202: Calculate the work done by the road driving resistance per second.

[0118] Among them, the embodiments of the present application can calculate the work done by the road driving resistance per second according to formulas (1) and (2).

[0119] Step S203: Calculate the single road driving resistance work in each braking emission test task.

[0120] Among them, the embodiments of the present application can use the Figure 3 in the single road driving resistance work calculation module 303 to calculate the single road driving resistance work in combination with formula (3).

[0121] Step S204: Calculate the single resistance work in each braking emission test task.

[0122] Among them, in the embodiment of the present application, the single resistance work calculation module 304 in Figure 3 can be used to calculate the single resistance work in combination with formula (4).

[0123] Step S205: Calculate the proportion of the work done by the single road running resistance.

[0124] Among them, in the embodiment of the present application, the proportion of the work done by the single road running resistance can be calculated according to the single road running resistance work and the single resistance work in combination with formula (6).

[0125] Step S206: Calculate the proportion of the total work done by the road running resistance.

[0126] Among them, in the embodiment of the present application, the work proportion calculation module 305 in Figure 3 can be used to calculate the proportion of the total work done by the road running resistance in combination with formula (5).

[0127] Step S207: Calculate the test wheel load.

[0128] Among them, in the embodiment of the present application, when the rated wheel load is known, the test wheel load calculation module 306 in Figure 3 can be used to calculate the test wheel load in combination with formula (7).

[0129] According to the method for determining the test wheel load of the brake in the heavy vehicle braking emission test proposed by the embodiment of the present application, the recommended value of the running resistance coefficient corresponding to the target heavy vehicle in all braking emission test tasks can be determined first, and then the proportion of the total work done by the road running resistance can be calculated based on the recommended value of the running resistance coefficient. Thus, the test wheel load of the brake can be calculated according to the rated wheel load. By calculating the proportion of the total road running resistance in the total resistance work in the braking emission test task of the specific braking emission test cycle of the target heavy vehicle, it covers all types of target heavy vehicles and different braking emission test cycles, and can truly reflect the situation that the actual wheel load borne by the brake is reduced due to the influence of the road running resistance when the target heavy vehicle actually runs this braking emission test cycle on the road. Furthermore, it ensures the authenticity and accuracy of the braking emission test results, greatly improves the efficiency, and reduces the cost. Therefore, it solves the problems in the related technology that it is impossible to determine the test wheel load of the test brake sample when different types of heavy vehicles conduct braking emission tests under different braking emission test cycles, and the implementation process is relatively complex, and the actual braking emission results of the brake are likely to occur, wasting a large amount of time, manpower, material resources, etc.

[0130] Next, describe the device for determining the test wheel load of the brake in the heavy vehicle braking emission test proposed by the embodiment of the present application with reference to the accompanying drawings.

[0131] Figure 4 It is a block diagram of a device for determining the wheel load of a brake in a heavy vehicle brake emission test according to an embodiment of the present application.

[0132] As Figure 4 shown, the device 40 for determining the wheel load of a brake in a heavy vehicle brake emission test includes: a determination module 100, a first calculation module 200, and a second calculation module 300.

[0133] Among them, the determination module 100 is used to determine the recommended value of the driving resistance coefficient corresponding to the target heavy vehicle in all brake emission test tasks.

[0134] The first calculation module 200 is used to calculate the proportion of the total road driving resistance work of the target heavy vehicle in all brake emission test tasks based on the recommended value of the driving resistance coefficient.

[0135] The second calculation module 300 is used to calculate the wheel load of the brake test of the target heavy vehicle in all brake emission test tasks based on the proportion of the total road driving resistance work and the rated wheel load of the target heavy vehicle.

[0136] Optionally, in an embodiment of the present application, the first calculation module 200 includes: a first calculation unit, a second calculation unit, a third calculation unit, and a fourth calculation unit.

[0137] Among them, the first calculation unit is used to calculate the road driving resistance of the target heavy vehicle at different vehicle speeds in each brake emission test task based on the recommended value of the driving resistance coefficient.

[0138] The second calculation unit is used to calculate the single road driving resistance work done by the road driving resistance in each brake emission test task based on the road driving resistance, and calculate the total road driving resistance work of the target heavy vehicle in all brake emission test tasks based on the single road driving resistance work.

[0139] The third calculation unit is used to calculate the single resistance work done by the resistance of the target heavy vehicle based on the initial braking speed and the final braking speed of the target heavy vehicle in each brake emission test task, and calculate the total resistance work of the target heavy vehicle in all brake emission test tasks based on the single resistance work.

[0140] The fourth calculation unit is used to calculate the proportion of the total road driving resistance work in the total resistance work based on the total road driving resistance work and the total resistance work.

[0141] Optionally, in an embodiment of the present application, the fourth calculation unit includes: a first calculation subunit and a second calculation subunit.

[0142] Among them, the first calculation subunit is used to calculate the proportion of the single-road driving resistance work in the single resistance work based on the single-road driving resistance work and the single resistance work.

[0143] The second calculation subunit is used to calculate the proportion of the total road driving resistance work based on the proportion of the single-road driving resistance work.

[0144] Optionally, in an embodiment of the present application, the calculation formula of the brake test wheel load can be but is not limited to:

[0145] W t =W n ×(1 - P),

[0146] wherein, W t is the test wheel load, kg; W n is the wheel rated load, kg.

[0147] Optionally, in an embodiment of the present application, the calculation formula of the proportion of the total road driving resistance work can be but is not limited to:

[0148]

[0149] wherein, P is the proportion of the road driving resistance work; P Oi is the proportion of the work of a single brake emission test task, P O1 represents the proportion of the road driving resistance work of the first brake emission test task, P On represents the proportion of the road driving resistance work of the last brake emission test task, and so on; n is the number of brake emission test tasks in the brake emission test cycle.

[0150] It should be noted that the foregoing explanation of the embodiment of the method for determining the brake test wheel load in the heavy vehicle brake emission test also applies to the device for determining the brake test wheel load in the heavy vehicle brake emission test of this embodiment, and will not be elaborated here.

[0151] The device for determining the test wheel load of the brake in the heavy vehicle brake emission test according to the embodiment of the present application can first determine the recommended value of the driving resistance coefficient corresponding to the target heavy vehicle in all brake emission test tasks, and then calculate the proportion of the total road driving resistance work based on the recommended value of the driving resistance coefficient, so as to calculate the test wheel load of the brake according to the rated wheel load. By calculating the proportion of the total road driving resistance in the total resistance work under the brake emission test task in a specific brake emission test cycle of the target heavy vehicle, it covers all types of target heavy vehicles and different brake emission test cycles, and can truly reflect the situation that the actual wheel load borne by the brake is reduced due to the influence of the road driving resistance when the target heavy vehicle operates this brake emission test cycle on the actual road. Furthermore, it ensures the authenticity and accuracy of the brake emission test results, greatly improves the efficiency, and reduces the cost. Thus, it solves the problems in the related art that it is impossible to determine the test wheel load of the test brake sample when different types of heavy vehicles conduct brake emission tests under different brake emission test cycles, and the implementation process is relatively complex, and the actual brake emission results of the brake are likely to occur, wasting a lot of time, manpower, material resources, etc.

[0152] Figure 5 FIG. 4 is a schematic structural diagram of a heavy vehicle according to an embodiment of the present application. The heavy vehicle may include:

[0153] A memory 501, a processor 502, and a computer program stored on the memory 501 and executable on the processor 502.

[0154] When the processor 502 executes the program, it implements the method for determining the test wheel load of the brake in the heavy vehicle brake emission test provided in the above embodiment.

[0155] Furthermore, the heavy vehicle further includes:

[0156] A communication interface 503 for communication between the memory 501 and the processor 502.

[0157] The memory 501 is used to store a computer program executable on the processor 502.

[0158] The memory 501 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory.

[0159] If the memory 501, the processor 502, and the communication interface 503 are implemented independently, the communication interface 503, the memory 501, and the processor 502 can be interconnected via a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 only a thick line is used to represent it in Figure 5 , but it does not mean that there is only one bus or one type of bus.

[0160] Optionally, in a specific implementation, if the memory 501, the processor 502, and the communication interface 503 are integrated on a single chip, the memory 501, the processor 502, and the communication interface 503 can communicate with each other through an internal interface.

[0161] The processor 502 may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0162] The embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the method for determining the wheel load of the brake test in the heavy vehicle brake emission test as described above is implemented.

[0163] The embodiments of the present application further provide a computer program product, including a computer program, and when the program is executed, the method for determining the wheel load of the brake test in the heavy vehicle brake emission test as described above is implemented.

[0164] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0165] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0166] Any process or method description shown in a flowchart or described in other ways herein can be understood as representing a module, segment, or portion of code including one or N executable instructions for implementing a customized logical function or process, and the scope of the preferred embodiments of this application includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in a reverse order according to the involved functions, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of this application pertain.

[0167] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in conjunction with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection part (electronic device) having one or N wirings, a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically by optically scanning the paper or other media, followed by editing, interpretation, or other appropriate processing as necessary, and then stored in a computer memory.

[0168] It should be understood that various parts of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), and the like.

[0169] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by a program instructing relevant hardware, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0170] In addition, each functional unit in various embodiments of the present application may be integrated into a processing module, may exist physically alone for each unit, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0171] The above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disc, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A method for determining brake test wheel load in a heavy vehicle brake emission test, characterized in that: The following steps are involved: Determine the recommended driving resistance coefficient for target heavy vehicles in all brake emission test tasks; Calculating the total road driving resistance work proportion of the target heavy-duty vehicle in all the brake emission test tasks based on the recommended driving resistance coefficient; The brake test wheel load of the target heavy-duty vehicle in all the brake emission test tasks is calculated based on the total road running resistance work ratio and the wheel rated load of the target heavy-duty vehicle.

2. The method according to claim 1, characterized in that The calculating the total road driving resistance work proportion of the target heavy-duty vehicle in all the brake emission test tasks based on the recommended driving resistance coefficient includes: Calculating the road driving resistance of the target heavy-duty vehicle at different vehicle speeds in each brake emission test task based on the recommended driving resistance coefficient; Calculate the single road driving resistance work done by the road driving resistance in each brake emission test task based on the road driving resistance, and calculate the total road driving resistance work of the target heavy-duty vehicle in all the brake emission test tasks based on the single road driving resistance work; Calculate the single resistance work done by the resistance of the target heavy-duty vehicle based on the initial braking speed and the final braking speed of the target heavy-duty vehicle in each braking emission test task, and calculate the total resistance work of the target heavy-duty vehicle in all the braking emission test tasks based on the single resistance work; The proportion of the total road driving resistance work in the total resistance work is calculated based on the total road driving resistance work and the total resistance work.

3. The method according to claim 2, characterized in that The calculating the proportion of the total road driving resistance work in the total resistance work based on the total road driving resistance work and the total resistance work includes: Calculating the proportion of the single road driving resistance work in the single resistance work based on the single road driving resistance work and the single resistance work; The total road driving resistance work ratio is calculated based on the single road driving resistance work ratio.

4. The method according to claim 1, characterized in that The calculation formula for the brake test wheel load is: W t =W n ×(1-P), Among them, W t is the test wheel load, kg; W n is the rated wheel load, kg.

5. The method according to claim 1, characterized in that The calculation formula of the total road running resistance work ratio is: Among them, P is the proportion of work done by road driving resistance; P oi is the work percentage of a single brake emission test task, P O1 Represents the road driving resistance work ratio of the first brake emission test task, P on It represents the percentage of road driving resistance work in the last brake emission test task, and so on; n is the number of brake emission test tasks in the brake emission test cycle.

6. A device for determining wheel load in a brake test of a heavy vehicle in a brake emission test, characterized in that: include: A determination module, used to determine the recommended value of the driving resistance coefficient corresponding to the target heavy-duty vehicle in all brake emission test tasks; A first calculation module, configured to calculate a total road driving resistance work ratio of the target heavy-duty vehicle in all the brake emission test tasks based on the recommended driving resistance coefficient; The second calculation module is used to calculate the brake test wheel load of the target heavy-duty vehicle in all the brake emission test tasks based on the total road running resistance work ratio and the wheel rated load of the target heavy-duty vehicle.

7. The device according to claim 6, characterized in that The first calculation module includes: A first calculation unit is used to calculate the road driving resistance of the target heavy-duty vehicle at different vehicle speeds in each brake emission test task based on the recommended value of the driving resistance coefficient; a second calculation unit, configured to calculate a single road driving resistance work done by the road driving resistance in each brake emission test task based on the road driving resistance, and calculate a total road driving resistance work done by the target heavy-duty vehicle in all the brake emission test tasks based on the single road driving resistance work; A third calculation unit is used to calculate the single resistance work done by the resistance of the target heavy-duty vehicle based on the initial braking speed and the final braking speed of the target heavy-duty vehicle in each braking emission test task, and calculate the total resistance work of the target heavy-duty vehicle in all the braking emission test tasks based on the single resistance work; A fourth calculation unit is used to calculate the proportion of the total road driving resistance work in the total resistance work based on the total road driving resistance work and the total resistance work.

8. A heavy vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for determining the brake test wheel load in a heavy vehicle brake emission test as described in any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method for determining the brake test wheel load in a heavy vehicle brake emission test as described in any one of claims 1 to 5.

10. A computer program product, characterized in that It comprises a computer program, which, when executed, is used to implement the method for determining the brake test wheel load in the heavy vehicle brake emission test as described in any one of claims 1 to 5.

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