Wheel diameter difference test method and device for rail transit vehicle traction system

Abstract

The invention discloses a wheel diameter difference test method and device for a rail transit vehicle traction system, and relates to the technical field of rail vehicles, and the device comprises a first wheel diameter tested motor and N second wheel diameter tested motors, the wheel diameters of the N second wheel diameter tested motors are the same, and the wheel diameter difference between the first wheel diameter tested motor and the second wheel diameter tested motor is a preset wheel diameter difference. The method comprises the following steps: determining a first traction characteristic of the first wheel diameter tested motor and a second traction characteristic of the second wheel diameter tested motor; determining a first braking characteristic of the first wheel diameter tested motor and a second braking characteristic of the second wheel diameter tested motor; and the first traction characteristic, the second traction characteristic, the first braking characteristic, the second braking characteristic, the preset rotating speed and the preset level serve as input of a controller of the rail transit vehicle traction system, and whether the rail transit vehicle traction system meets the operation requirement under the preset wheel diameter difference or not is determined according to the temperature rise of the rail transit vehicle traction system.

Description

Technical Field

[0001] The present invention relates to the field of rail transit technology, and in particular to a wheel diameter difference test method and device for a rail transit vehicle traction system. Background Art

[0002] For rail transit vehicles, when two or four or more asynchronous traction motors are powered in parallel by a single converter, the vehicle wheel diameter deviation will cause some traction motors to operate under their worst load conditions. If the designed control system causes some traction motors to operate under their worst load conditions, it is generally necessary to perform additional temperature rise tests on the traction motors to verify that the traction motors can meet the requirements for operation under wheel diameter deviation.

[0003] There are generally two existing methods for wheel diameter difference testing, which are respectively suitable for continuous load and line operation load.

[0004] Continuous load: The speeds of the parallel asynchronous traction motors are controlled separately, and their speed deviations correspond to the maximum allowable wheel diameter deviations of the parallel traction motors. This test should be carried out under traction conditions or braking conditions, or under both conditions, and the traction motors should be placed under the worst load conditions. Under traction conditions, the speed of one traction motor should be given a lower speed than that of other traction motors to obtain a higher torque. Under braking conditions, the speed of one traction motor should be given a higher speed than that of other traction motors to obtain a higher torque. This test method is generally applicable to vehicles running at long intervals such as EMUs. The traction motors of this type of vehicles are generally designed to be able to operate at the rated point for a long time and the motor temperature rise does not exceed the limit.

[0005] Line operation load: The speed of the parallel traction motors is controlled separately, and the speed deviation corresponds to the maximum allowable wheel diameter deviation of the parallel traction motors. The speed of a given traction motor is lower than that of other traction motors to obtain higher torque during traction and lower torque during braking. This test method is generally applicable to urban rail transit vehicles, such as subways or urban vehicles and other short-distance running vehicles. This type of vehicle has a specified operating line and there are many emergency start and stop conditions. The traction motor frequently switches between traction and braking conditions. The traction motor of this type of vehicle is generally designed based on the principle that the motor temperature rise corresponding to the motor equivalent current under line conditions does not exceed the limit.

[0006] The continuous load test method is relatively simple, and the test only needs to be carried out at a constant speed point, such as the rated speed point. Most traction system test benches have the ability to adjust the speed of the test motors of different axes at a constant speed point, but this method has high requirements on the motor's own capabilities. When the wheel diameter deviation is large, the motor is prone to overheating. The line operation load test method is closer to the actual operating conditions, but it has higher requirements on the test bench. The test bench needs to have the ability to adjust the speeds of the test motors of different axes at different speeds under line conditions, and the test bench construction cost is relatively high.

[0007] This section is intended to provide a background or context for the embodiments of the invention described in the book. No description herein is admitted to be prior art by inclusion in this section. Summary of the invention

[0008] In order to solve at least one of the problems in the above background technology section, the present application provides a wheel diameter difference test method and device for a rail transit vehicle traction system, which does not require the test bench to have the ability to adjust different speeds under line conditions, but can meet the line operation load condition requirements.

[0009] In a first aspect, an embodiment of the present invention provides a wheel diameter difference test method for a rail transit vehicle traction system, wherein the rail transit vehicle traction system includes 1 first wheel diameter test motor and N second wheel diameter test motors, wherein the wheel diameters of the N second wheel diameter test motors are the same, and the wheel diameter difference between the first wheel diameter test motor and the second wheel diameter test motor is a preset wheel diameter difference; the test method includes:

[0010] Determine a first traction characteristic of the first wheel diameter tested motor and a second traction characteristic of each of the second wheel diameter tested motors;

[0011] Determine a first braking characteristic of the first wheel diameter tested motor and a second braking characteristic of each of the second wheel diameter tested motors;

[0012] The first traction characteristic, the second traction characteristic, the first braking characteristic, the second braking characteristic, the preset speed and the preset level are used as inputs of the controller of the rail transit vehicle traction system, and according to the temperature rise of the rail transit vehicle traction system, it is determined whether the rail transit vehicle traction system meets the operating requirements under the preset wheel diameter difference.

[0013] In some optional aspects of this embodiment, before determining the first traction characteristic of the tested motor of the first wheel diameter and the second traction characteristic of the tested motor of the second wheel diameter, the test method further includes:

[0014] A test system for performing a wheel diameter difference test on the rail transit vehicle traction system is constructed, wherein the test system comprises:

[0015] Test motor drive controller and tested motor drive controller;

[0016] One first wheel diameter test motor and N second wheel diameter test motors connected to the test motor drive controller;

[0017] The one first wheel diameter tested motor and the N second wheel diameter tested motors connected to the tested motor drive controller;

[0018] A first torque meter for connecting the first wheel diameter test motor and the first wheel diameter test motor; and N second torque meters for connecting the second wheel diameter test motor and the second wheel diameter test motor.

[0019] In some optional aspects of this embodiment, the step of determining the first traction characteristic of the tested motor with the first wheel diameter includes:

[0020] In response to gradually increasing the speed of the rail transit vehicle from 0 to a preset maximum operating speed, performing a traction characteristic determination operation at each speed point, wherein the number of the speed points is n, and the steps of the traction characteristic determination operation include:

[0021] Determining a first target speed of the tested motor with the first wheel diameter based on the vehicle speed corresponding to the vehicle speed point;

[0022] Based on the test motor drive controller, the speed of the first wheel diameter test motor is adjusted to the first target speed, wherein the first wheel diameter test motor is dragged by the first wheel diameter test motor to the first target speed, and the level of the rail transit vehicle traction system is set to 100%;

[0023] Determine, based on the first torque meter, a first torque transmitted between the first wheel diameter companion test motor and the first wheel diameter test motor at the first target speed;

[0024] Based on the n first target speeds and the n first torques, a first traction characteristic of the tested motor with the first wheel diameter is determined.

[0025] In some optional aspects of this embodiment, the step of determining the traction characteristic further includes:

[0026] Determining a second target speed of the second wheel diameter tested motor based on the vehicle speed corresponding to the vehicle speed point;

[0027] Based on the test motor drive controller, adjusting the speed of the second wheel diameter test motor to the second target speed, wherein the second wheel diameter test motor is dragged by the second wheel diameter test motor to the second target speed, and the level of the rail transit vehicle traction system is set to 100%;

[0028] Determine, based on the second torque meter, a second torque transmitted between the second wheel diameter companion test motor and the second wheel diameter test motor at the second target speed;

[0029] The step of determining the second traction characteristic of the second wheel diameter tested motor includes:

[0030] Based on the n second target speeds and the n second torques, a second traction characteristic of the second wheel diameter test motor is determined.

[0031] In some optional aspects of this embodiment, the step of determining the first braking characteristic of the first wheel diameter tested motor includes:

[0032] In response to gradually increasing or decreasing the speed of the rail transit vehicle from a preset maximum operating speed to 0, performing a braking characteristic determination operation at each speed point, wherein the number of the speed points is m, and the steps of the braking characteristic determination operation include:

[0033] Determining a third target speed of the tested motor of the first wheel diameter based on the vehicle speed corresponding to the vehicle speed point;

[0034] Based on the test motor drive controller, the speed of the first wheel diameter test motor is adjusted to the third target speed, wherein the first wheel diameter test motor is dragged by the first wheel diameter test motor to the third target speed, and the level of the rail transit vehicle traction system is set to 100%;

[0035] Determine, based on the first torque meter, a third torque transmitted between the first wheel diameter companion test motor and the first wheel diameter test motor at the third target speed;

[0036] Based on the m third target rotation speeds and the m third torques, a first braking characteristic of the first wheel diameter test motor is determined.

[0037] In some optional aspects of this embodiment, the step of determining the braking characteristic further includes:

[0038] Determining a fourth target speed of the tested motor of the second wheel diameter based on the vehicle speed corresponding to the vehicle speed point;

[0039] Based on the test motor drive controller, the speed of the second wheel diameter test motor is adjusted to the fourth target speed, wherein the second wheel diameter test motor is dragged by the second wheel diameter test motor to the fourth target speed, and the level of the rail transit vehicle traction system is set to 100%;

[0040] Determine, based on the second torque meter, a fourth torque transmitted between the second wheel diameter accompanying test motor and the second wheel diameter tested motor at the fourth target speed;

[0041] The step of determining the second braking characteristic of the second wheel diameter tested motor comprises:

[0042] Based on the m fourth target rotational speeds and the m fourth torques, a second braking characteristic of the second wheel diameter test motor is determined.

[0043] In some optional aspects of this embodiment, determining whether the rail transit vehicle traction system meets the operation requirements under the preset wheel diameter difference according to the temperature rise of the rail transit vehicle traction system includes:

[0044] Determine whether the temperature rise of the first wheel diameter tested motor and the temperature rise of the N second wheel diameter tested motors are both less than a preset temperature rise threshold;

[0045] If so, determining that the rail transit vehicle traction system meets the operation requirements under the preset wheel diameter difference;

[0046] If not, it is determined that the rail transit vehicle traction system does not meet the operating requirements under the preset wheel diameter difference.

[0047] In a second aspect, an embodiment of the present invention further provides a wheel diameter difference test device for a rail transit vehicle traction system, wherein the rail transit vehicle traction system comprises a first wheel diameter test motor and N second wheel diameter test motors, wherein the wheel diameters of the N second wheel diameter test motors are the same, and the wheel diameter difference between the first wheel diameter test motor and the second wheel diameter test motor is a preset wheel diameter difference; the test device comprises:

[0048] A traction characteristic determination module, which determines a first traction characteristic of the first wheel diameter tested motor and a second traction characteristic of each of the second wheel diameter tested motors;

[0049] A braking characteristic determination module, determining a first braking characteristic of the first wheel diameter tested motor and a second braking characteristic of each of the second wheel diameter tested motors;

[0050] An operation requirement determination module uses the first traction characteristic, the second traction characteristic, the first braking characteristic, the second braking characteristic, the preset speed and the preset level as inputs of a controller of the rail transit vehicle traction system, and determines whether the rail transit vehicle traction system meets the operation requirements under the preset wheel diameter difference according to the temperature rise of the rail transit vehicle traction system.

[0051] In a third aspect, an embodiment of the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned wheel diameter difference test method for a rail transit vehicle traction system when executing the computer program.

[0052] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the wheel diameter difference test method for a rail transit vehicle traction system is implemented.

[0053] In a fifth aspect, an embodiment of the present invention further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the above-mentioned wheel diameter difference test method for a rail transit vehicle traction system is implemented.

[0054] The wheel diameter difference test method and device for the traction system of a rail transit vehicle provided by the embodiment of the present invention are aimed at the need to carry out a wheel diameter difference test on the traction system of a rail transit vehicle. The traction system test bench does not need to have the ability to adjust the speeds of the test motors of different axes at different speeds. It only needs to have the ability to adjust the speeds of the test motors of different axes at a constant speed point. The wheel diameter difference test performed by this method can be closer to the actual operating conditions and can better reflect the capabilities of the traction motor itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0056] Figure 1 This is one of the flow charts of a wheel diameter difference test method for a rail transit vehicle traction system according to an embodiment of the present invention;

[0057] Figure 2 A waveform diagram of a preset rotation speed in an embodiment of the present invention;

[0058] Figure 3 A schematic diagram of a waveform of a preset level in an embodiment of the present invention;

[0059] Figure 4 It is a structural schematic diagram of a test system for a wheel diameter difference test performed on a traction system of a rail transit vehicle in an embodiment of the present invention;

[0060] Figure 5This is a second flow chart of a method for testing wheel diameter difference of a traction system of a rail transit vehicle according to an embodiment of the present invention;

[0061] Figure 6 The third flow chart of the wheel diameter difference test method for the traction system of a rail transit vehicle according to an embodiment of the present invention;

[0062] Figure 7 This is a fourth flow chart of a method for testing wheel diameter difference of a traction system of a rail transit vehicle according to an embodiment of the present invention;

[0063] Figure 8 This is a fifth flow chart of a wheel diameter difference test method for a rail transit vehicle traction system according to an embodiment of the present invention;

[0064] Fig. 9 This is a sixth flow chart of a wheel diameter difference test method for a rail transit vehicle traction system according to an embodiment of the present invention;

[0065] Fig.10 This is a seventh flow chart of a method for testing wheel diameter difference of a traction system of a rail transit vehicle according to an embodiment of the present invention;

[0066] Fig.11 Schematic diagram of traction characteristics of a tested motor with a large wheel diameter and a tested motor with a small wheel diameter in an embodiment of the present invention;

[0067] Fig.12 Schematic diagram of braking characteristics of a tested motor with a large wheel diameter and a tested motor with a small wheel diameter in an embodiment of the present invention;

[0068] Fig.13 This is a schematic structural diagram of a wheel diameter difference test device for a rail transit vehicle traction system according to an embodiment of the present invention;

[0069] Fig.14 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0070] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0071] The principles and spirit of this specification will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement this specification, and are not intended to limit the scope of this specification in any way. On the contrary, these embodiments are provided to make this specification more thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art.

[0072] Those skilled in the art will appreciate that the embodiments of this specification may be implemented as a system, device, method, or computer program product. Therefore, this specification may be implemented in the following forms: complete hardware, complete software (including firmware, resident software, code, etc.), or a combination of hardware and software.

[0073] The details of the present invention can be more clearly understood by combining the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on another element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the communication between the two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this specification belongs. The terms used herein in this specification are only for the purpose of describing specific embodiments and are not intended to limit this specification. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0075] In a first aspect, an embodiment of the present invention provides a wheel diameter difference test method for a rail transit vehicle traction system, wherein the rail transit vehicle traction system includes 1 first wheel diameter test motor and N second wheel diameter test motors, wherein the wheel diameters of the N second wheel diameter test motors are the same, and the wheel diameter difference between the first wheel diameter test motor and the second wheel diameter test motor is a preset wheel diameter difference.

[0076] It should be noted that the wheel diameter of the first wheel diameter tested motor is the first wheel diameter, and the wheel diameter of the second wheel diameter tested motor is the second wheel diameter. The present application does not limit the size of the first wheel diameter and the second wheel diameter. The first wheel diameter can be larger than the second wheel diameter, or the second wheel diameter can be larger than the first wheel diameter. The first wheel diameter and the second wheel diameter can satisfy the preset wheel diameter difference. The preset wheel diameter difference is customized according to the actual needs of the wheel diameter difference test.

[0077] Therefore, the 1 first wheel diameter tested motor and N second wheel diameter tested motors of the present embodiment include the following 2 situations: 1 large wheel diameter tested motor and N small wheel diameter tested motors; 1 small wheel diameter tested motor and N large wheel diameter tested motors, wherein the wheel diameter difference between the large wheel diameter tested motor and the small wheel diameter tested motor is a preset wheel diameter difference.

[0078] like Figure 1 As shown, the test method includes:

[0079] Step 10, determining a first traction characteristic of the first wheel diameter tested motor and a second traction characteristic of each of the second wheel diameter tested motors;

[0080] Step 20, determining a first braking characteristic of the first wheel diameter tested motor and a second braking characteristic of each of the second wheel diameter tested motors;

[0081] Step 30: Using the first traction characteristic, the second traction characteristic, the first braking characteristic, the second braking characteristic, the preset speed and the preset level as inputs of the controller of the rail transit vehicle traction system, and determining whether the rail transit vehicle traction system meets the operating requirements under the preset wheel diameter difference according to the temperature rise of the rail transit vehicle traction system.

[0082] It should be noted that traction characteristics refer to the relationship between the traction force (i.e. the force to push or pull an object) and speed of the traction equipment under different speed and load conditions. It reflects the dynamic performance of the equipment at work and is usually used to describe the performance of electrical and mechanical systems, especially in electric vehicles (such as electric trains, trams, etc.) and other traction equipment (such as tractors, cranes, etc.).

[0083] The traction characteristics can usually be displayed using a traction characteristic curve, which usually takes traction as the vertical axis and speed as the horizontal axis. Through this curve, we can observe the maximum traction that the equipment can provide at different speeds or the speed change when the traction decreases.

[0084] It should also be noted that braking characteristics refer to the braking performance of a vehicle or equipment during the braking process, which is usually reflected in the relationship between braking force, braking distance and speed. Understanding braking characteristics is crucial to ensuring traffic safety and improving vehicle performance, especially in various means of transportation such as electric vehicles, trains, and airplanes.

[0085] The braking characteristics can be represented by a braking characteristic curve. This curve generally takes the braking force (or braking deceleration) as the vertical axis and the speed as the horizontal axis, reflecting the braking ability of the vehicle at different speeds.

[0086] In this embodiment, taking one large wheel diameter tested motor and N small wheel diameter tested motors as an example, the wheel diameter difference test method for the rail transit vehicle traction system of the present application is described, wherein:

[0087] Step 10': determining the first traction characteristic of the large wheel diameter tested motor and the second traction characteristic of each of the small wheel diameter tested motors.

[0088] Step 20', determining the first braking characteristic of the large wheel diameter tested motor and the second braking characteristic of each of the small wheel diameter tested motors.

[0089] Step 30', using the first traction characteristic, the second traction characteristic, the first braking characteristic, the second braking characteristic, the preset speed and the preset level as inputs of the controller of the rail transit vehicle traction system, and determining whether the rail transit vehicle traction system meets the operating requirements under the preset wheel diameter difference according to the temperature rise of the rail transit vehicle traction system.

[0090] Specifically, Figure 2 It is the speed input of the traction system test bench during line test, and the speed changes with the running time; Figure 3 It is the gear input of the traction system test bench during the line test, and the gear changes with the running time. It should be noted that the total time length of the speed input and gear input of the traction system test bench is the same, and the speed and gear strictly correspond at a certain moment; the gear input is positive and negative, and when the gear is positive, it means that the test motor is working in the traction condition, and when the gear is negative, it means that the test motor is working in the braking condition. The horizontal axis represents the running time, and the vertical axis represents the gear size at the corresponding time; the absolute value of the gear input is between [0,100%].

[0091] This test method is applicable to the condition where a single converter supplies power to N+1 asynchronous traction motors in parallel, where N can be an integer greater than 1, with no restrictions on odd or even numbers; this test method is applicable to the condition where the test bench accompanying test system can adjust multiple axes to work at different speeds.

[0092] In some optional aspects of this embodiment, before determining the first traction characteristic of the large wheel diameter tested motor and the second traction characteristic of the small wheel diameter tested motor, the test method further includes:

[0093] Step 00: construct a test system for the wheel diameter difference test of the rail transit vehicle traction system, wherein: Figure 4 As shown, the test system comprises:

[0094] Test motor drive controller and tested motor drive controller;

[0095] One first wheel diameter test motor and N second wheel diameter test motors connected to the test motor drive controller;

[0096] The one first wheel diameter tested motor and the N second wheel diameter tested motors connected to the tested motor drive controller;

[0097] A first torque meter for connecting the first wheel diameter test motor and the first wheel diameter test motor; and N second torque meters for connecting each of the second wheel diameter test motors and each of the second wheel diameter test motors.

[0098] In a specific example, still taking one large wheel diameter tested motor and N small wheel diameter tested motors as an example, the test system for performing a wheel diameter difference test on the rail transit vehicle traction system of the present application is described, wherein the test system includes:

[0099] Test motor drive controller and tested motor drive controller;

[0100] One large wheel diameter companion test motor and N small wheel diameter companion test motors connected to the companion test motor drive controller;

[0101] One large wheel diameter tested motor and N small wheel diameter tested motors connected to the tested motor drive controller;

[0102] A first torque meter for connecting the large wheel diameter companion test motor and the large wheel diameter tested motor; and a second torque meter for connecting each of the small wheel diameter tested motors and each of the small wheel diameter companion test motors.

[0103] In some optional embodiments of this embodiment, Figure 5 As shown, the step of determining the first traction characteristic of the tested motor with the first wheel diameter includes:

[0104] Step 101: In response to gradually increasing the speed of the rail transit vehicle from 0 to a preset maximum operating speed, performing a traction characteristic determination operation at each speed point, wherein the number of the speed points is n, and the steps of the traction characteristic determination operation include:

[0105] Step S1, determining a first target speed of the tested motor of the first wheel diameter based on the vehicle speed corresponding to the vehicle speed point;

[0106] Step S2, based on the test motor drive controller, adjusting the speed of the first wheel diameter test motor to the first target speed, wherein the first wheel diameter test motor is dragged by the first wheel diameter test motor to the first target speed, and the level of the rail transit vehicle traction system is set to 100%;

[0107] Step S3, determining, based on the first torque meter, a first torque transmitted between the first wheel diameter companion test motor and the first wheel diameter test motor at the first target speed;

[0108] Step 102: Determine a first traction characteristic of the first wheel diameter test motor based on the n first target speeds and the n first torques.

[0109] In a specific example, still taking one large wheel diameter tested motor and N small wheel diameter tested motors as an example, determining the first traction characteristic of the large wheel diameter tested motor is described, including the following steps:

[0110] Step 101', in response to gradually increasing the speed of the rail transit vehicle from 0 to a preset maximum operating speed, performing a traction characteristic determination operation at each speed point, wherein the number of the speed points is n, such as Figure 6 As shown, the steps of the traction characteristic determination operation include:

[0111] Step S1', determining a first target speed of the large wheel diameter tested motor based on the vehicle speed corresponding to the vehicle speed point;

[0112] Step S2', based on the test motor drive controller, adjusting the rotation speed of the large wheel diameter test motor to the first target rotation speed, and at the same time the motor under test is dragged to the same rotation speed, wherein the level of the rail transit vehicle traction system is set to 100%;

[0113] Step S3', determining, based on the first torque meter, a first torque transmitted between the large wheel diameter companion test motor and the large wheel diameter tested motor at the first target speed;

[0114] Step 102': determining a first traction characteristic of the large-wheel-diameter tested motor based on the n first target speeds and the n first torques.

[0115] In some optional embodiments of this embodiment, Figure 7 As shown, the step of determining the traction characteristic operation further includes:

[0116] S4, determining a second target speed of the tested motor with the second wheel diameter based on the vehicle speed corresponding to the vehicle speed point;

[0117] S5, based on the test motor drive controller, adjusting the speed of the second wheel diameter test motor to the second target speed, wherein the second wheel diameter test motor is dragged by the second wheel diameter test motor to the second target speed, and the level of the rail transit vehicle traction system is set to 100%;

[0118] S6. Determine, based on the second torque meter, a second torque transmitted between the second wheel diameter companion test motor and the second wheel diameter test motor at the second target speed;

[0119] The step of determining the second traction characteristic of the second wheel diameter tested motor includes:

[0120] Based on the n second target speeds and the n second torques, a second traction characteristic of the second wheel diameter test motor is determined.

[0121] Still taking one large wheel diameter tested motor and N small wheel diameter tested motors as an example, the step of determining the traction characteristics operation further includes:

[0122] Step S4', determining a second target speed of the small wheel diameter tested motor based on the vehicle speed corresponding to the vehicle speed point;

[0123] Step S5', based on the test motor drive controller, adjusting the rotation speed of the small-wheel-diameter test motor to the second target rotation speed, and at the same time the motor under test is dragged to the same rotation speed, wherein the level of the rail transit vehicle traction system is set to 100%;

[0124] Step S6', determining, based on the second torque meter, a second torque transmitted between the small-wheel diameter companion test motor and the small-wheel diameter tested motor at the second target speed;

[0125] The step of determining the second traction characteristic of the small wheel diameter tested motor comprises:

[0126] Based on the n second target speeds and the n second torques, a second traction characteristic of the small-wheel-diameter tested motor is determined.

[0127] In some optional embodiments of this embodiment, Figure 8 As shown, the step of determining the first braking characteristic of the first wheel diameter tested motor includes:

[0128] Step 201: In response to gradually increasing or decreasing the speed of the rail transit vehicle from a preset maximum operating speed to 0, a braking characteristic determination operation is performed at each speed point, wherein the number of the speed points is m, and the steps of the braking characteristic determination operation include:

[0129] Step A1, determining a third target speed of the tested motor of the first wheel diameter based on the vehicle speed corresponding to the vehicle speed point;

[0130] Step A2: Based on the test motor drive controller, the speed of the first wheel diameter test motor is adjusted to the third target speed, wherein the first wheel diameter test motor is dragged by the first wheel diameter test motor to the third target speed, and the level of the rail transit vehicle traction system is set to 100%;

[0131] Step A3, determining, based on the first torque meter, a third torque transmitted between the first wheel diameter accompanying test motor and the first wheel diameter tested motor at the third target speed;

[0132] Step 202: Determine a first braking characteristic of the first wheel diameter test motor based on the m third target rotational speeds and the m third torques.

[0133] Still taking one large wheel diameter tested motor and N small wheel diameter tested motors as an example, the step of determining the first braking characteristic of the large wheel diameter tested motor includes:

[0134] Step 201', in response to gradually increasing or decreasing the speed of the rail transit vehicle from a preset maximum operating speed to 0, performing a braking characteristic determination operation at each speed point, wherein the number of the speed points is m, such as Fig. 9 As shown, the steps of the braking characteristic determination operation include:

[0135] Step A1', determining a third target speed of the large wheel diameter tested motor based on the vehicle speed corresponding to the vehicle speed point;

[0136] Step A2', based on the test motor drive controller, adjusting the rotation speed of the large wheel diameter test motor to the third target rotation speed, and at the same time the motor under test is dragged to the same rotation speed, wherein the level of the rail transit vehicle traction system is set to 100%;

[0137] Step A3', determining, based on the first torque meter, a third torque transmitted between the large wheel diameter companion test motor and the large wheel diameter tested motor at the third target speed;

[0138] Step 202': determining a first braking characteristic of the large wheel diameter tested motor based on the m third target rotational speeds and the m third torques.

[0139] In some optional embodiments of this embodiment, Fig.10 As shown, the step of the braking characteristic determination operation further includes:

[0140] Step A4, based on the vehicle speed corresponding to the speed point, determine the fourth target speed of the second wheel diameter test motor; wherein, the motor speed n = v*1000000*c / (60*π*D), wherein v is the vehicle speed, the unit is km / h, c is the gear ratio, and D is the wheel diameter, the unit is mm.

[0141] Step A5: Based on the test motor drive controller, the speed of the second wheel diameter test motor is adjusted to the fourth target speed, wherein the second wheel diameter test motor is dragged by the second wheel diameter test motor to the fourth target speed, and the level of the rail transit vehicle traction system is set to 100%;

[0142] Step A6: determining, based on the second torque meter, a fourth torque transmitted between the second wheel diameter accompanying test motor and the second wheel diameter tested motor at the fourth target speed;

[0143] The step of determining the second braking characteristic of the second wheel diameter tested motor comprises:

[0144] Based on the m fourth target rotational speeds and the m fourth torques, a second braking characteristic of the second wheel diameter test motor is determined.

[0145] Still taking one large wheel diameter tested motor and N small wheel diameter tested motors as an example, the step of the braking characteristic determination operation further includes:

[0146] Step A5', determining a fourth target speed of the small-wheel-diameter tested motor based on the vehicle speed corresponding to the vehicle speed point;

[0147] Step A6', based on the test motor drive controller, adjusting the rotation speed of the small-wheel diameter test motor to the fourth target rotation speed, and at the same time the motor under test is dragged to the same rotation speed, wherein the level of the rail transit vehicle traction system is set to 100%;

[0148] Step A7', determining, based on the second torque meter, a fourth torque transmitted between the small-wheel diameter accompanying test motor and the small-wheel diameter tested motor at the fourth target speed;

[0149] The step of determining the second braking characteristic of the small wheel diameter tested motor comprises:

[0150] Based on the m fourth target rotational speeds and the m fourth torques, a second braking characteristic of the small-wheel-diameter tested motor is determined.

[0151] Taking the control of two motors by one controller as an example, the wheel diameter difference test method of the present application will be further described as follows:

[0152] Step B1. As Fig.11 shown, when the vehicle speed is v1 and the wheel diameters of the two axles on the same frame are the same, the two motors maintain the same speed n1. Adjust the handle position of the traction system test bench to 100%, so that the torques T1 corresponding to the traction characteristic curves when the two motors both reach the speed n1 are exerted.

[0153] Step B2. When the vehicle speed remains at v1, according to the motor speed n = v * 1000000 * c / (60 * π * D), where v is the vehicle speed in km / h, c is the gear ratio, and D is the wheel diameter in mm. When the wheel diameters of the two axles on the same frame are D2 and D3 respectively, the speeds of the two motors are n2 and n3 respectively.

[0154] Step B3. According to n = v * 1000000 * c / (60 * π * D), when D2 > D3, then n3 > n2.

[0155] Step B4. Change the speeds of the two motors of the traction system test bench to n2 and n3 respectively, and still set the handle position to 100%. Record the torques T2 and T3 exerted by the two motors.

[0156] Step B5. Since n2 < n3, under the traction condition, the slip ratio s2 corresponding to n2 > the slip ratio s3 corresponding to n3, so T2 > T3.

[0157] Step B6. Gradually increase the vehicle speed v from 0 to the maximum operating speed, and repeat the operations of Step B1 to Step B5 at each vehicle speed point, then the Figure 4 shown traction characteristic curve can be obtained. The smaller the vehicle speed interval, the more accurate the characteristic curve.

[0158] Step B7. As Fig.11 shown, the black solid line is the traction characteristic curve under normal conditions without wheel diameter difference, the dotted line is the traction characteristic curve of the large wheel diameter D2, and the dash-dotted line is the traction characteristic curve of the small wheel diameter D3. Under the traction condition, the torque exerted by the large wheel diameter is greater.

[0159] Step B8. When the vehicle speed is v1', when the wheel diameters of the two axles on the same frame are the same, the two motors maintain the same speed n1'. Adjust the handle position of the traction system test bench to 100%, so that the torques T1' corresponding to the braking characteristic curves when the two motors both reach the speed n1' are exerted.

[0160] Step B9. When the vehicle speed remains at v1', according to the motor speed n = v * 1000000 * c / (60 * π * D), where v is the vehicle speed in km / h, c is the gear ratio, and D is the wheel diameter in mm. When the wheel diameters of the two axles of the same frame are D2' and D3' respectively, the speeds of the two motors are n2' and n3' respectively.

[0161] Step B10. According to n = v * 1000000 * c / (60 * π * D), when D2 > D3, then n3 > n2.

[0162] Step B11. Change the speeds of the two motors of the traction system test bench to n2 and n3 respectively, and still give the handle position k1'. Record the torques exerted by the two motors as T2' and T3'.

[0163] Step B12. Since n2 < n3, under the braking condition, the slip ratio s2' corresponding to n2 < the slip ratio s3' corresponding to n3, so T2' < T3'.

[0164] Step B13. Gradually increase the vehicle speed v from 0 to the maximum operating speed, and repeat the operations of Step B8 to Step B12 at each vehicle speed point, then the Fig.12 shown braking characteristic curve can be obtained. The smaller the vehicle speed interval, the more accurate the characteristic curve.

[0165] Step B14. As Fig.12 shown, the black solid line is the braking characteristic curve under normal conditions without wheel diameter difference, the dotted line is the braking characteristic curve of the small wheel diameter D3, and the dash-dotted line is the braking characteristic curve of the large wheel diameter D2. It can be seen that under the braking condition, the torque exerted by the small wheel diameter is greater.

[0166] Step B15. Take the traction characteristics and braking characteristics under the large wheel diameter, or the traction characteristics and braking characteristics under the small wheel diameter as the input of the traction system controller, and cooperate with Figure 2 and Figure 3 the speed and position input, then the wheel diameter difference test close to the actual operating conditions can be carried out.

[0167] In some alternative ways of this embodiment, determining whether the rail transit vehicle traction system meets the operation requirements under the preset wheel diameter difference according to the temperature rise of the rail transit vehicle traction system includes:

[0168] Determine whether the temperature rises of the first wheel diameter tested motor and the N second wheel diameter tested motors are both less than the preset temperature rise threshold; for example, determine whether the temperature rises of the large wheel diameter tested motor and the N small wheel diameter tested motors are both less than the preset temperature rise threshold; or determine whether the temperature rises of the small wheel diameter tested motor and the N large wheel diameter tested motors are both less than the preset temperature rise threshold.

[0169] If so, determining that the rail transit vehicle traction system meets the operation requirements under the preset wheel diameter difference;

[0170] If not, it is determined that the rail transit vehicle traction system does not meet the operating requirements under the preset wheel diameter difference.

[0171] This patent application is aimed at the need to carry out wheel diameter difference tests on the traction system of rail transit vehicles. It does not require the traction system test bench to have the ability to adjust the speeds of the test motors on different axes at different speeds. It only needs to have the ability to adjust the speeds of the test motors on different axes at a constant speed point. The wheel diameter difference test using this method can be closer to the actual operating conditions and better reflect the capabilities of the traction motor itself.

[0172] The present invention also provides a wheel diameter difference test device for a rail transit vehicle traction system, as described in the following embodiments. Since the principle of the device to solve the problem is similar to the wheel diameter difference test method for a rail transit vehicle traction system, the implementation of the device can refer to the implementation of the wheel diameter difference test method for a rail transit vehicle traction system, and the repeated parts will not be repeated.

[0173] The rail transit vehicle traction system includes 1 first wheel diameter tested motor and N second wheel diameter tested motors, wherein the wheel diameters of the N second wheel diameter tested motors are the same, and the wheel diameter difference between the first wheel diameter tested motor and the second wheel diameter tested motor is a preset wheel diameter difference; Fig.13 As shown, the test device comprises:

[0174] A traction characteristic determination module 601 is configured to determine a first traction characteristic of the first wheel diameter tested motor and a second traction characteristic of each of the second wheel diameter tested motors;

[0175] A braking characteristic determination module 602 is configured to determine a first braking characteristic of the first wheel diameter tested motor and a second braking characteristic of each of the second wheel diameter tested motors;

[0176] The operation requirement determination module 603 uses the first traction characteristic, the second traction characteristic, the first braking characteristic, the second braking characteristic, the preset speed and the preset level as inputs of the controller of the rail transit vehicle traction system, and determines whether the rail transit vehicle traction system meets the operation requirements under the preset wheel diameter difference according to the temperature rise of the rail transit vehicle traction system.

[0177] In some optional aspects of this embodiment, the test device further includes:

[0178] A test system construction module is used to construct a test system for performing a wheel diameter difference test on the rail transit vehicle traction system, wherein the test system includes:

[0179] Test motor drive controller and tested motor drive controller;

[0180] One first wheel diameter test motor and N second wheel diameter test motors connected to the test motor drive controller;

[0181] The one first wheel diameter tested motor and the N second wheel diameter tested motors connected to the tested motor drive controller;

[0182] A first torque meter for connecting the first wheel diameter test motor and the first wheel diameter test motor; and N second torque meters for connecting each of the second wheel diameter test motors and each of the second wheel diameter test motors.

[0183] In some optional aspects of this embodiment, the traction characteristic determination module includes a first traction characteristic determination unit and a second traction characteristic determination unit, wherein the first traction characteristic determination unit is configured as follows:

[0184] In response to gradually increasing the speed of the rail transit vehicle from 0 to a preset maximum operating speed, performing a traction characteristic determination operation at each speed point, wherein the number of the speed points is n, and the steps of the traction characteristic determination operation include:

[0185] Determining a first target speed of the tested motor with the first wheel diameter based on the vehicle speed corresponding to the vehicle speed point;

[0186] Based on the test motor drive controller, the speed of the first wheel diameter test motor is adjusted to the first target speed, wherein the first wheel diameter test motor is dragged by the first wheel diameter test motor to the first target speed, and the level of the rail transit vehicle traction system is set to 100%;

[0187] Determine, based on the first torque meter, a first torque transmitted between the first wheel diameter companion test motor and the first wheel diameter test motor at the first target speed;

[0188] Based on the n first target speeds and the n first torques, a first traction characteristic of the tested motor with the first wheel diameter is determined.

[0189] In some optional aspects of this embodiment, the step of determining the traction characteristic further includes:

[0190] Determining a second target speed of the second wheel diameter tested motor based on the vehicle speed corresponding to the vehicle speed point;

[0191] Based on the test motor drive controller, adjusting the speed of the second wheel diameter test motor to the second target speed, wherein the second wheel diameter test motor is dragged by the second wheel diameter test motor to the second target speed, and the level of the rail transit vehicle traction system is set to 100%;

[0192] Determine, based on the second torque meter, a second torque transmitted between the second wheel diameter companion test motor and the second wheel diameter test motor at the second target speed;

[0193] Wherein, the second traction characteristic determination unit is configured as follows:

[0194] Based on the n second target speeds and the n second torques, a second traction characteristic of the second wheel diameter test motor is determined.

[0195] In some optional aspects of this embodiment, the braking characteristic determination module includes a first braking characteristic determination unit and a second braking characteristic determination unit, wherein the first braking characteristic determination unit is configured as follows:

[0196] In response to gradually increasing or decreasing the speed of the rail transit vehicle from a preset maximum operating speed to 0, performing a braking characteristic determination operation at each speed point, wherein the number of the speed points is m, and the steps of the braking characteristic determination operation include:

[0197] Determining a third target speed of the tested motor of the first wheel diameter based on the vehicle speed corresponding to the vehicle speed point;

[0198] Based on the test motor drive controller, the speed of the first wheel diameter test motor is adjusted to the third target speed, wherein the first wheel diameter test motor is dragged by the first wheel diameter test motor to the third target speed, and the level of the rail transit vehicle traction system is set to 100%;

[0199] Determine, based on the first torque meter, a third torque transmitted between the first wheel diameter companion test motor and the first wheel diameter test motor at the third target speed;

[0200] Based on the m third target rotation speeds and the m third torques, a first braking characteristic of the first wheel diameter test motor is determined.

[0201] In some optional aspects of this embodiment, the step of determining the braking characteristic further includes:

[0202] Determining a fourth target speed of the tested motor of the second wheel diameter based on the vehicle speed corresponding to the vehicle speed point;

[0203] Based on the test motor drive controller, the speed of the second wheel diameter test motor is adjusted to the fourth target speed, wherein the second wheel diameter test motor is dragged by the second wheel diameter test motor to the fourth target speed, and the level of the rail transit vehicle traction system is set to 100%;

[0204] Determine, based on the second torque meter, a fourth torque transmitted between the second wheel diameter accompanying test motor and the second wheel diameter tested motor at the fourth target speed;

[0205] Wherein, the second braking characteristic determination unit is configured as follows:

[0206] Based on the m fourth target rotational speeds and the m fourth torques, a second braking characteristic of the small-wheel-diameter tested motor is determined.

[0207] In some optional aspects of this embodiment, determining whether the rail transit vehicle traction system meets the operation requirements under the preset wheel diameter difference according to the temperature rise of the rail transit vehicle traction system includes:

[0208] Determine whether the temperature rise of the first wheel diameter tested motor and the temperature rise of the N second wheel diameter tested motors are both less than a preset temperature rise threshold;

[0209] If so, determining that the rail transit vehicle traction system meets the operation requirements under the preset wheel diameter difference;

[0210] If not, it is determined that the rail transit vehicle traction system does not meet the operating requirements under the preset wheel diameter difference.

[0211] According to an embodiment of the present application, the present application also provides an electronic device, a computer-readable storage medium and a computer program product.

[0212] An electronic device includes: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the wheel diameter difference test method for a rail transit vehicle traction system of the aforementioned embodiment.

[0213] A non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable a computer to execute the wheel diameter difference test method for a rail transit vehicle traction system of the aforementioned embodiment.

[0214] A computer program product includes a computer program. When the computer program is executed by a processor, the wheel diameter difference test method for a rail transit vehicle traction system of the above embodiment is implemented.

[0215] Fig.14 A schematic block diagram of an example electronic device 900 that can be used to implement an embodiment of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present disclosure described and / or required herein.

[0216] like Fig.14 As shown, the device 900 includes a computing unit 901, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 902 or a computer program loaded from a storage unit 908 into a random access memory (RAM) 903. In the RAM 903, various programs and data required for the operation of the device 900 can also be stored. The computing unit 901, the ROM 902, and the RAM 903 are connected to each other via a bus 904. An input / output (I / O) interface 905 is also connected to the bus 904.

[0217] A number of components in the device 900 are connected to the I / O interface 905, including: an input unit 906, such as a keyboard, a mouse, etc.; an output unit 907, such as various types of displays, speakers, etc.; a storage unit 908, such as a disk, an optical disk, etc.; and a communication unit 909, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 909 allows the device 900 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0218] The computing unit 901 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 901 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The computing unit 901 performs the various methods and processes described above, such as a wheel diameter difference test method for a rail transit vehicle traction system.

[0219] For example, in some embodiments, the wheel diameter difference test method for the rail transit vehicle traction system may be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit 908. In some embodiments, part or all of the computer program may be loaded and / or installed on the device 900 via the ROM 902 and / or the communication unit 909. When the computer program is loaded into the RAM 903 and executed by the computing unit 901, one or more steps of the wheel diameter difference test method for the rail transit vehicle traction system described above may be performed. Alternatively, in other embodiments, the computing unit 901 may be configured to perform a wheel diameter difference test method for the rail transit vehicle traction system in any other appropriate manner (e.g., by means of firmware).

[0220] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0221] The program code for implementing the method of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0222] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0223] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0224] The systems and techniques described herein may be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), and the Internet.

[0225] A computer system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The relationship of client and server is generated by computer programs running on respective computers and having a client-server relationship with each other. The server may be a cloud server, a server of a distributed system, or a server combined with a blockchain.

[0226] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of this disclosure can be achieved, and this document is not limited here.

[0227] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0228] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A wheel diameter difference test method for a rail transit vehicle traction system, characterized in that: The rail transit vehicle traction system comprises a first wheel diameter tested motor and N second wheel diameter tested motors, wherein the wheel diameters of the N second wheel diameter tested motors are the same, and the wheel diameter difference between the first wheel diameter tested motor and the second wheel diameter tested motor is a preset wheel diameter difference; the test method comprises: Determine a first traction characteristic of the first wheel diameter tested motor and a second traction characteristic of each of the second wheel diameter tested motors; Determine a first braking characteristic of the first wheel diameter tested motor and a second braking characteristic of each of the second wheel diameter tested motors; The first traction characteristic, the second traction characteristic, the first braking characteristic, the second braking characteristic, the preset speed and the preset level are used as inputs of the controller of the rail transit vehicle traction system, and according to the temperature rise of the rail transit vehicle traction system, it is determined whether the rail transit vehicle traction system meets the operating requirements under the preset wheel diameter difference.

2. The test method according to claim 1, characterized in that Before determining the first traction characteristic of the first wheel diameter tested motor and the second traction characteristic of each of the second wheel diameter tested motors, the test method further includes: A test system for performing a wheel diameter difference test on the rail transit vehicle traction system is constructed, wherein the test system comprises: Test motor drive controller and tested motor drive controller; One first wheel diameter test motor and N second wheel diameter test motors connected to the test motor drive controller; The one first wheel diameter tested motor and the N second wheel diameter tested motors connected to the tested motor drive controller; A first torque meter for connecting the first wheel diameter test motor and the first wheel diameter test motor; and N second torque meters for connecting each of the second wheel diameter test motors and each of the second wheel diameter test motors.

3. The test method according to claim 2, characterized in that: The step of determining the first traction characteristic of the motor under test with the first wheel diameter comprises: In response to gradually increasing the speed of the rail transit vehicle from 0 to a preset maximum operating speed, performing a traction characteristic determination operation at each speed point, wherein the number of the speed points is n, and the steps of the traction characteristic determination operation include: Determining a first target speed of the tested motor with the first wheel diameter based on the vehicle speed corresponding to the vehicle speed point; Based on the test motor drive controller, the speed of the first wheel diameter test motor is adjusted to the first target speed, wherein the first wheel diameter test motor is dragged by the first wheel diameter test motor to the first target speed, and the level of the rail transit vehicle traction system is set to 100%; Determine, based on the first torque meter, a first torque transmitted between the first wheel diameter companion test motor and the first wheel diameter test motor at the first target speed; Based on the n first target speeds and the n first torques, a first traction characteristic of the tested motor with the first wheel diameter is determined.

4. The test method according to claim 3, characterized in that The step of determining the traction characteristics operation further includes: Determining a second target speed of the second wheel diameter tested motor based on the vehicle speed corresponding to the vehicle speed point; Based on the test motor drive controller, adjusting the speed of the second wheel diameter test motor to the second target speed, wherein the second wheel diameter test motor is dragged to the second target speed, and the level of the rail transit vehicle traction system is set to 100%; Determine, based on the second torque meter, a second torque transmitted between the second wheel diameter companion test motor and the second wheel diameter test motor at the second target speed; The step of determining the second traction characteristic of the second wheel diameter tested motor includes: Based on the n second target speeds and the n second torques, a second traction characteristic of the second wheel diameter test motor is determined.

5. The test method according to claim 2, characterized in that: The step of determining the first braking characteristic of the motor under test of the first wheel diameter comprises: In response to gradually increasing or decreasing the speed of the rail transit vehicle from a preset maximum operating speed to 0, performing a braking characteristic determination operation at each speed point, wherein the number of the speed points is m, and the steps of the braking characteristic determination operation include: Determining a third target speed of the tested motor of the first wheel diameter based on the vehicle speed corresponding to the vehicle speed point; Based on the test motor drive controller, the speed of the first wheel diameter test motor is adjusted to the third target speed, wherein the first wheel diameter test motor is dragged by the first wheel diameter test motor to the third target speed, and the level of the rail transit vehicle traction system is set to 100%; Determine, based on the first torque meter, a third torque transmitted between the first wheel diameter companion test motor and the first wheel diameter test motor at the third target speed; Based on the m third target rotation speeds and the m third torques, a first braking characteristic of the first wheel diameter test motor is determined.

6. The test method according to claim 5, characterized in that The step of the braking characteristic determination operation further comprises: Determining a fourth target speed of the tested motor of the second wheel diameter based on the vehicle speed corresponding to the vehicle speed point; Based on the test motor drive controller, the speed of the second wheel diameter test motor is adjusted to the fourth target speed, wherein the second wheel diameter test motor is dragged by the second wheel diameter test motor to the fourth target speed, and the level of the rail transit vehicle traction system is set to 100%; Determine, based on the second torque meter, a fourth torque transmitted between the second wheel diameter companion test motor and the second wheel diameter test motor at the fourth target speed; The step of determining the second braking characteristic of the second wheel diameter tested motor comprises: Based on the m fourth target rotational speeds and the m fourth torques, a second braking characteristic of the second wheel diameter test motor is determined.

7. The test method according to claim 1, characterized in that: The determining, based on the temperature rise of the rail transit vehicle traction system, whether the rail transit vehicle traction system meets the operation requirements under the preset wheel diameter difference includes: Determine whether the temperature rise of the first wheel diameter tested motor and the temperature rise of the N second wheel diameter tested motors are both less than a preset temperature rise threshold; If so, determining that the rail transit vehicle traction system meets the operation requirements under the preset wheel diameter difference; If not, it is determined that the rail transit vehicle traction system does not meet the operating requirements under the preset wheel diameter difference.

8. A wheel diameter difference test device for a rail transit vehicle traction system, characterized in that: The rail transit vehicle traction system comprises a first wheel diameter tested motor and N second wheel diameter tested motors, wherein the wheel diameters of the N second wheel diameter tested motors are the same, and the wheel diameter difference between the first wheel diameter tested motor and the second wheel diameter tested motor is a preset wheel diameter difference; the test device comprises: A traction characteristic determination module, which determines a first traction characteristic of the first wheel diameter tested motor and a second traction characteristic of each of the second wheel diameter tested motors; A braking characteristic determination module, determining a first braking characteristic of the first wheel diameter tested motor and a second braking characteristic of each of the second wheel diameter tested motors; An operation requirement determination module uses the first traction characteristic, the second traction characteristic, the first braking characteristic, the second braking characteristic, the preset speed and the preset level as inputs of a controller of the rail transit vehicle traction system, and determines whether the rail transit vehicle traction system meets the operation requirements under the preset wheel diameter difference according to the temperature rise of the rail transit vehicle traction system.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the wheel diameter difference test method for a rail transit vehicle traction system according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the wheel diameter difference test method for a rail transit vehicle traction system according to any one of claims 1 to 7 is implemented.

11. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the wheel diameter difference test method for a rail transit vehicle traction system according to any one of claims 1 to 7 is implemented.

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