New energy automobile electric drive system efficiency test method and device

Abstract

The invention provides a new energy automobile electric drive system efficiency test method and device, and the method comprises the steps: carrying out the modification of a to-be-tested vehicle, and obtaining a modified vehicle; connecting the modified vehicle with test equipment; pre-testing the modified vehicle based on the test equipment; when the pre-test is passed, performing a static test on the modified vehicle to obtain static test data; carrying out dynamic test on the modified vehicle to obtain dynamic test data; calculating average driving efficiency according to the static test data, and calculating average recovery efficiency according to the dynamic test data; and outputting a test result including the average driving efficiency and the average recovery efficiency. Therefore, the method and the device can realize the measurement of the output mechanical energy of the electric drive assembly in the whole vehicle state, and are closer to the actual working state of the whole vehicle, so that an accurate and effective data basis can be provided for exploring and improving the electric drive efficiency and reducing the power consumption of the whole vehicle.

Description

Technical Field

[0001] The present application relates to the technical field of whole vehicle testing, and more specifically, to a method and device for testing the efficiency of an electric drive system of a new energy vehicle. Background Art

[0002] At present, the power consumption of pure electric vehicles is one of the important indicators to measure their performance, and the efficiency of electric drive directly affects the power consumption level. Therefore, in the process of developing the power consumption of pure electric vehicles, accurately measuring the efficiency of electric drive becomes a key step. As a component that realizes the conversion of electrical energy into mechanical energy, the key to measuring the efficiency of electric drive lies in accurately obtaining the output mechanical energy. At present, the conventional electric drive efficiency test method is based on the electric drive efficiency test method of the whole vehicle, which uses a dynamometer to measure the wheel-end torque. However, the wheel-end torque includes the electric drive output torque and the drag torque of the wheel hub bearing and caliper. The electric drive output torque cannot be directly measured, so the electric drive efficiency cannot be directly obtained. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a method and device for testing the efficiency of the electric drive system of a new energy vehicle, which can measure the output mechanical energy of the electric drive assembly in the whole vehicle state, which is closer to the actual working state of the whole vehicle, thereby providing an accurate and effective data basis for exploring ways to improve the electric drive efficiency and reduce the power consumption of the whole vehicle.

[0004] The first aspect of the present application provides a method for testing the efficiency of an electric drive system of a new energy vehicle, comprising:

[0005] Modifying the vehicle to be tested to obtain a modified vehicle;

[0006] connecting the modified vehicle to a test device;

[0007] performing a pre-test on the modified vehicle based on the test equipment;

[0008] When the pre-test is passed, a static test is performed on the modified vehicle to obtain static test data; and a dynamic test is performed on the modified vehicle to obtain dynamic test data;

[0009] Calculating an average driving efficiency according to the static test data, and calculating an average recovery efficiency according to the dynamic test data;

[0010] The output includes test results of the average driving efficiency and the average recovery efficiency.

[0011] In the above implementation process, this method can measure the output mechanical energy of the electric drive assembly in the whole vehicle state, which is closer to the actual working state of the whole vehicle, thereby providing an accurate and effective data basis for exploring ways to improve the electric drive efficiency and reduce the power consumption of the whole vehicle.

[0012] Furthermore, the step of modifying the vehicle to be tested to obtain the modified vehicle includes:

[0013] The mechanical parts of the vehicle to be tested are dismantled, the electric control DC busbar is modified, and the control harness is modified to obtain a modified vehicle.

[0014] Furthermore, the test equipment at least includes a dynamometer, a power analyzer and a host computer;

[0015] The modified vehicle is connected to the dynamometer, and when connected, the position of the dynamometer is moved to adjust the transmission shaft angle to a preset target value;

[0016] The electric control DC bus of the modified vehicle is connected to the power analyzer through a current clamp, and the voltage lead of the modified vehicle is connected to the power analyzer;

[0017] The control harness of the modified vehicle is connected to the host computer.

[0018] Further, the pre-testing of the modified vehicle based on the test equipment includes:

[0019] Outputting a preset resistance torque through the dynamometer in the test equipment so that the host computer controls the speed of the modified vehicle;

[0020] Confirming that the wheel hub bearing of the modified vehicle rotates as a whole with the half shaft;

[0021] Confirm that the signal acquisition of the test equipment is normal.

[0022] Furthermore, the static test of the modified vehicle to obtain static test data includes:

[0023] controlling the electric drive speed and electric drive torque of the modified vehicle by means of a dynamometer in the test equipment;

[0024] When the electric drive speed of the modified vehicle is stabilized at a preset electric drive speed, and the electric drive torque of the modified vehicle is stabilized at a preset electric drive torque, static test data is collected within a preset time period.

[0025] Furthermore, the dynamic test of the modified vehicle to obtain dynamic test data includes:

[0026] Obtain compensation resistance curve and working condition curve;

[0027] According to the compensation resistance curve, simulating the road resistance of the whole vehicle at various vehicle speeds by means of a dynamometer in the test equipment;

[0028] The speed of the modified vehicle is controlled, and dynamic test data is collected following the operating condition curve.

[0029] A second aspect of the present application provides a new energy vehicle electric drive system efficiency test device, the new energy vehicle electric drive system efficiency test device comprising:

[0030] A modification unit, used for modifying the vehicle to be tested to obtain a modified vehicle;

[0031] a connecting unit, used to connect the modified vehicle to a test device;

[0032] a pre-test unit, configured to perform a pre-test on the modified vehicle based on the test equipment;

[0033] A first test unit, used for performing a static test on the modified vehicle to obtain static test data when the pre-test passes;

[0034] A second testing unit is used to perform a dynamic test on the modified vehicle to obtain dynamic test data;

[0035] a calculation unit, configured to calculate an average driving efficiency according to the static test data, and to calculate an average recovery efficiency according to the dynamic test data;

[0036] The output unit is used to output the test results including the average driving efficiency and the average recovery efficiency.

[0037] Furthermore, the modification unit is specifically used to dismantle mechanical components of the vehicle to be tested, modify the electric control DC bus and modify the control harness to obtain a modified vehicle.

[0038] Furthermore, the test equipment at least includes a dynamometer, a power analyzer and a host computer;

[0039] The modified vehicle is connected to the dynamometer, and when connected, the position of the dynamometer is moved to adjust the transmission shaft angle to a preset target value;

[0040] The electric control DC bus of the modified vehicle is connected to the power analyzer through a current clamp, and the voltage lead of the modified vehicle is connected to the power analyzer;

[0041] The control harness of the modified vehicle is connected to the host computer.

[0042] Furthermore, the pre-test unit comprises:

[0043] An output subunit, used for outputting a preset resistance torque through a dynamometer in the test equipment, so that a host computer controls the speed of the modified vehicle;

[0044] A confirmation subunit, used to confirm that the wheel hub bearing of the modified vehicle rotates as a whole with the half shaft;

[0045] The confirmation subunit is also used to confirm that the signal acquisition of the test device is normal.

[0046] Furthermore, the first test unit includes:

[0047] a control subunit, for controlling the electric drive speed and electric drive torque of the modified vehicle through a dynamometer in the test equipment;

[0048] The first test subunit is used to collect static test data within a preset time period when the electric drive speed of the modified vehicle is stabilized at a preset electric drive speed and the electric drive torque of the modified vehicle is stabilized at a preset electric drive torque.

[0049] Furthermore, the second test unit includes:

[0050] An acquisition subunit is used to acquire a compensation resistance curve and a working condition curve;

[0051] a simulation subunit, for simulating the road resistance of the whole vehicle at various vehicle speeds through a dynamometer in the test equipment according to the compensation resistance curve;

[0052] The second test subunit is used to control the speed of the modified vehicle and collect dynamic test data following the operating condition curve.

[0053] The third aspect of the present application provides an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the new energy vehicle electric drive system efficiency test method described in any one of the first aspect of the present application.

[0054] A fourth aspect of the present application provides a computer-readable storage medium storing computer program instructions. When the computer program instructions are read and executed by a processor, the new energy vehicle electric drive system efficiency test method described in any one of the first aspect of the present application is executed.

[0055] The beneficial effects of the present application are as follows: the method and device can measure the electric drive efficiency map and the average efficiency based on a certain vehicle working condition under the whole vehicle state. Specifically, the method sets requirements for the test conditions such as the whole vehicle voltage platform and thermal state, so that its test environment is closer to the actual working state of the whole vehicle, which is conducive to accurately judging the achievement of the electric drive efficiency; at the same time, the method can also compare the whole vehicle test results with the simulation results, calibrate the simulation model, and improve the simulation capability; in addition, the method can also measure the electric drive efficiency by changing the whole vehicle state, and explore methods to improve the electric drive efficiency and reduce the power consumption of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0057] Figure 1 A schematic diagram of a flow chart of a method for testing the efficiency of an electric drive system of a new energy vehicle provided in an embodiment of the present application;

[0058] Figure 2 A schematic flow chart of another new energy vehicle electric drive system efficiency test method provided in an embodiment of the present application;

[0059] Figure 3 A schematic diagram of a conventional vehicle transmission connection structure provided in an embodiment of the present application;

[0060] Figure 4 A schematic diagram of the connection of a new energy vehicle electric drive system efficiency test bench provided in an embodiment of the present application;

[0061] Figure 5 A schematic diagram of an example flow chart of a new energy vehicle electric drive system efficiency test method provided in an embodiment of the present application;

[0062] Figure 6 A schematic diagram of the structure of a new energy vehicle electric drive system efficiency test device provided in an embodiment of the present application;

[0063] Figure 7 A schematic diagram of the structure of another new energy vehicle electric drive system efficiency testing device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0065] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0066] Example 1

[0067] Please see Figure 1 , Figure 1 A schematic flow chart of a method for testing the efficiency of an electric drive system of a new energy vehicle provided in this embodiment. The method for testing the efficiency of an electric drive system of a new energy vehicle includes:

[0068] S101. Modify the vehicle to be tested to obtain a modified vehicle.

[0069] S102, connecting the modified vehicle to the testing equipment.

[0070] S103: Preliminary testing is performed on the modified vehicle based on the testing equipment.

[0071] S104. When the pre-test is passed, a static test is performed on the modified vehicle to obtain static test data; and a dynamic test is performed on the modified vehicle to obtain dynamic test data.

[0072] S105 . Calculate an average driving efficiency according to the static test data, and calculate an average recovery efficiency according to the dynamic test data.

[0073] S106 . Output test results including average driving efficiency and average recovery efficiency.

[0074] In this embodiment, the execution subject of the method may be a computing device such as a computer or a server, and no limitation is made in this embodiment.

[0075] In this embodiment, the execution subject of the method may also be a smart device such as a smart phone, a tablet computer, etc., which is not limited in this embodiment.

[0076] It can be seen that the implementation of the new energy vehicle electric drive system efficiency test method described in this embodiment can realize the measurement of the output mechanical energy of the electric drive assembly in the whole vehicle state, which is closer to the actual working state of the whole vehicle, thereby providing an accurate and effective data basis for exploring ways to improve the electric drive efficiency and reduce the power consumption of the whole vehicle.

[0077] Example 2

[0078] Please see Figure 2 , Figure 2 A schematic flow chart of a method for testing the efficiency of an electric drive system of a new energy vehicle provided in this embodiment. The method for testing the efficiency of an electric drive system of a new energy vehicle includes:

[0079] S201, dismantling mechanical parts of a vehicle to be tested, remodeling the electric control DC bus and the control wiring harness, to obtain a remodeled vehicle.

[0080] In this embodiment, the method can support the lower body of the vehicle to be tested (or called the tested vehicle) in advance through the bench tooling until the vehicle can be supported without the suspension and tires. Among them, since this method needs to disconnect the wheel hub bearing from the whole vehicle, thereby eliminating the wheel hub bearing drag torque and measuring the output torque of the electric drive assembly, this method will cause the vehicle to lose support, prompting the vehicle to be tested to require additional support.

[0081] In this embodiment, the method can perform corresponding preparation work on the vehicle to be tested after supporting the vehicle to be tested, wherein the preparation work includes disassembly of mechanical parts, modification of the electric control DC bus and modification of the control harness, etc.

[0082] Please see Figure 3 , Figure 3 The schematic diagram of the traditional vehicle transmission connection structure is shown. Figure 3 The process of mechanical component disassembly and related structural modification can be easily understood as shown in the figure. Among them, mechanical component disassembly includes disassembling the brake caliper and brake disc, disconnecting the wheel hub bearing from the steering knuckle, disassembling the steering knuckle, thereby eliminating the drag torque of the wheel hub bearing and caliper, and measuring the output torque of the electric drive; the modification of the electronic control DC bus includes stripping the shielding layer of the wire harness for accurate current measurement, leading out the positive and negative wire harnesses for voltage measurement; the modification of the control wire harness refers to leading out the accelerator pedal signal, thereby controlling the electric drive torque or vehicle speed.

[0083] S202, connecting the modified vehicle to the test equipment.

[0084] In this embodiment, the test equipment includes at least a dynamometer, a power analyzer and a host computer;

[0085] The modified vehicle is connected to the dynamometer, and when connected, the position of the dynamometer is moved to adjust the transmission shaft angle to reach the preset target value;

[0086] The electric control DC bus of the modified vehicle is connected to the power analyzer through a current clamp, and the voltage lead of the modified vehicle is connected to the power analyzer;

[0087] The control harness of the modified vehicle is connected to the host computer.

[0088] In this embodiment, the test equipment includes a power analyzer, a powertrain test bench (i.e., a new energy vehicle electric drive system efficiency test bench) and a host computer. Among them, the power analyzer is used to measure the current and voltage at the electric drive input end; the powertrain test bench can be selected as a two-drive powertrain bench or a four-drive powertrain bench according to needs, each with two or four dynamometers for measuring the speed and torque of the transmission half shaft; the host computer is used to control the whole vehicle and the dynamometer.

[0089] In this embodiment, in order to achieve the connection between the vehicle to be tested and the dynamometer, a tooling is required. One end of the tooling is connected to the vehicle's transmission half shaft and wheel hub bearing, and the other end is connected to the dynamometer. At the same time, if the sensors on the mechanical parts such as the steering knuckle are removed simultaneously (such as the wheel speed sensor), the tooling needs to be equipped with corresponding sensors. Figure 4 , Figure 4 The figure shows the connection diagram of the efficiency test bench of the electric drive system of new energy vehicles.

[0090] In this embodiment, when the tooling connects the vehicle to be tested to the dynamometer, it is necessary to move the dynamometer to adjust the transmission shaft angle to reach the target value; connect the electronically controlled DC bus to the power analyzer through a current clamp, and connect the voltage lead to the power analyzer; connect the control harness to the host computer to achieve vehicle control.

[0091] S203, outputting a preset resistance torque through a dynamometer in the test equipment, so that the host computer controls the speed of the modified vehicle.

[0092] S204, confirming that the wheel hub bearing of the modified vehicle rotates as a whole along with the half shaft.

[0093] S205. Confirm that the signal acquisition of the test equipment is normal.

[0094] In this embodiment, the method can be tested once in advance. Specifically, the test can output a certain resistance torque from the dynamometer to ensure that the throttle can be controlled by the host computer, thereby controlling the vehicle speed; it can also confirm that the wheel hub bearing rotates with the half shaft as a whole and does not contact other parts such as the steering knuckle; and further confirm that the test bench signal collection is normal.

[0095] S206: When the pre-test passes, the electric drive speed and electric drive torque of the modified vehicle are controlled by a dynamometer in the test equipment.

[0096] S207 . When the electric drive speed of the modified vehicle is stabilized at a preset electric drive speed, and the electric drive torque of the modified vehicle is stabilized at a preset electric drive torque, static test data is collected within a preset time period.

[0097] In this embodiment, the above process describes the process of performing static testing by this method.

[0098] In this embodiment, static testing refers to the process of measuring the efficiency of the electric drive at a fixed torque and fixed speed point to obtain an efficiency map. Specifically, the method implements electric drive speed control through a dynamometer and electric drive torque control through an accelerator pedal signal, so that the electric drive is stabilized at a certain speed and torque point for a period of time, and corresponding data (the data is the static test data) is collected at the same time.

[0099] S208: Obtain a compensation resistance curve and an operating condition curve.

[0100] S209: According to the compensation resistance curve, the road resistance of the whole vehicle at each vehicle speed is simulated by a dynamometer in the testing equipment.

[0101] S210, controlling the speed of the modified vehicle, and collecting dynamic test data following the operating condition curve.

[0102] In this embodiment, the above process describes the process of performing dynamic testing by this method.

[0103] In this embodiment, the dynamic test refers to the process of measuring the average efficiency of the electric drive during the process of following the working condition curves such as CLTC and NEDC. In order to follow the working condition curve, the method first obtains the compensation resistance curve, so that the dynamometer simulates the road resistance of the whole vehicle at various vehicle speeds, and the coasting method refers to GB 18352.6-2016; then, the method controls the vehicle speed by controlling the accelerator pedal, follows the working condition curve, and collects data (this data is dynamic test data).

[0104] S211. Calculate an average driving efficiency according to the static test data, and calculate an average recovery efficiency according to the dynamic test data.

[0105] In this embodiment, the above steps describe the process of data processing. Specifically, the method selects a test data segment and integrates the electric end power and the mechanical end power to obtain the electric energy and mechanical energy in this time period. At this time, if the electric drive is in a driving state, the average driving efficiency is obtained by dividing the mechanical energy by the electric energy; if the electric drive is in a recovery state, the average recovery efficiency is obtained by dividing the electric energy by the mechanical energy.

[0106] S212: Output test results including average driving efficiency and average recovery efficiency.

[0107] Please see Figure 5 , Figure 5 The figure shows an example flow chart of a method for testing the efficiency of an electric drive system of a new energy vehicle.

[0108] In this embodiment, the execution subject of the method may be a computing device such as a computer or a server, and no limitation is made in this embodiment.

[0109] In this embodiment, the execution subject of the method may also be a smart device such as a smart phone, a tablet computer, etc., which is not limited in this embodiment.

[0110] It can be seen that the implementation of the new energy vehicle electric drive system efficiency test method described in this embodiment can realize the measurement of the output mechanical energy of the electric drive assembly in the whole vehicle state, which is closer to the actual working state of the whole vehicle, thereby providing an accurate and effective data basis for exploring ways to improve the electric drive efficiency and reduce the power consumption of the whole vehicle.

[0111] Example 3

[0112] Please see Figure 6 , Figure 6 This is a schematic diagram of the structure of a new energy vehicle electric drive system efficiency test device provided in this embodiment. Figure 6 As shown, the new energy vehicle electric drive system efficiency test device includes:

[0113] A modification unit 310 is used to modify the vehicle to be tested to obtain a modified vehicle;

[0114] A connection unit 320, used to connect the modified vehicle to the test equipment;

[0115] A pre-test unit 330, for pre-testing the modified vehicle based on the test equipment;

[0116] The first test unit 340 is used to perform a static test on the modified vehicle to obtain static test data when the pre-test passes;

[0117] The second testing unit 350 is used to perform a dynamic test on the modified vehicle to obtain dynamic test data;

[0118] A calculation unit 360, for calculating an average driving efficiency according to static test data, and calculating an average recovery efficiency according to dynamic test data;

[0119] The output unit 370 is used to output the test results including the average driving efficiency and the average recovery efficiency.

[0120] In this embodiment, the explanation of the efficiency test device for the electric drive system of a new energy vehicle can refer to the description in Embodiment 1 or Embodiment 2, and will not be further elaborated in this embodiment.

[0121] It can be seen that the new energy vehicle electric drive system efficiency testing device described in this embodiment can realize the measurement of the output mechanical energy of the electric drive assembly in the whole vehicle state, which is closer to the actual working state of the whole vehicle, thereby providing an accurate and effective data basis for exploring ways to improve the electric drive efficiency and reduce the power consumption of the whole vehicle.

[0122] Example 4

[0123] Please see Figure 7 , Figure 7 This is a schematic diagram of the structure of a new energy vehicle electric drive system efficiency test device provided in this embodiment. Figure 7 As shown, the new energy vehicle electric drive system efficiency test device includes:

[0124] A modification unit 310 is used to modify the vehicle to be tested to obtain a modified vehicle;

[0125] A connection unit 320, used to connect the modified vehicle to the test equipment;

[0126] A pre-test unit 330, for pre-testing the modified vehicle based on the test equipment;

[0127] The first test unit 340 is used to perform a static test on the modified vehicle to obtain static test data when the pre-test passes;

[0128] The second testing unit 350 is used to perform a dynamic test on the modified vehicle to obtain dynamic test data;

[0129] A calculation unit 360, for calculating an average driving efficiency according to static test data, and calculating an average recovery efficiency according to dynamic test data;

[0130] The output unit 370 is used to output the test results including the average driving efficiency and the average recovery efficiency.

[0131] As an optional implementation, the modification unit 310 is specifically used to dismantle mechanical components of the vehicle to be tested, modify the electric control DC bus and modify the control harness to obtain a modified vehicle.

[0132] In this embodiment, the test equipment includes at least a dynamometer, a power analyzer and a host computer;

[0133] The modified vehicle is connected to the dynamometer, and when connected, the position of the dynamometer is moved to adjust the transmission shaft angle to reach the preset target value;

[0134] The electric control DC bus of the modified vehicle is connected to the power analyzer through a current clamp, and the voltage lead of the modified vehicle is connected to the power analyzer;

[0135] The control harness of the modified vehicle is connected to the host computer.

[0136] As an optional implementation, the pre-test unit 330 includes:

[0137] The output subunit 331 is used to output a preset resistance torque through a dynamometer in the test equipment so that the host computer controls the speed of the modified vehicle;

[0138] A confirmation subunit 332 is used to confirm that the wheel hub bearing of the modified vehicle rotates as a whole with the half shaft;

[0139] The confirmation subunit 332 is also used to confirm that the signal acquisition of the test equipment is normal.

[0140] As an optional implementation, the first testing unit 340 includes:

[0141] A control subunit 341, used to control the electric drive speed and electric drive torque of the modified vehicle through a dynamometer in the test equipment;

[0142] The first test subunit 342 is used to collect static test data within a preset time period when the electric drive speed of the modified vehicle is stabilized at a preset electric drive speed and the electric drive torque of the modified vehicle is stabilized at a preset electric drive torque.

[0143] As an optional implementation, the second testing unit 350 includes:

[0144] An acquisition subunit 351 is used to acquire a compensation resistance curve and a working condition curve;

[0145] The simulation subunit 352 is used to simulate the road resistance of the whole vehicle at various vehicle speeds through a dynamometer in the test equipment according to the compensation resistance curve;

[0146] The second test subunit 353 is used to control the speed of the modified vehicle and collect dynamic test data following the operating condition curve.

[0147] In this embodiment, the explanation of the efficiency test device for the electric drive system of a new energy vehicle can refer to the description in Embodiment 1 or Embodiment 2, and will not be further elaborated in this embodiment.

[0148] It can be seen that the new energy vehicle electric drive system efficiency testing device described in this embodiment can realize the measurement of the output mechanical energy of the electric drive assembly in the whole vehicle state, which is closer to the actual working state of the whole vehicle, thereby providing an accurate and effective data basis for exploring ways to improve the electric drive efficiency and reduce the power consumption of the whole vehicle.

[0149] An embodiment of the present application provides an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the new energy vehicle electric drive system efficiency test method in embodiment 1 or embodiment 2 of the present application.

[0150] An embodiment of the present application provides a computer-readable storage medium storing computer program instructions. When the computer program instructions are read and executed by a processor, the new energy vehicle electric drive system efficiency test method in embodiment 1 or embodiment 2 of the present application is executed.

[0151] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0152] In addition, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0153] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0154] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0155] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0156] 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 sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A method for testing the efficiency of an electric drive system of a new energy vehicle, characterized in that: include: Modifying the vehicle to be tested to obtain a modified vehicle; connecting the modified vehicle to a test device; performing a pre-test on the modified vehicle based on the test equipment; When the pre-test is passed, a static test is performed on the modified vehicle to obtain static test data; and a dynamic test is performed on the modified vehicle to obtain dynamic test data; Calculating an average driving efficiency according to the static test data, and calculating an average recovery efficiency according to the dynamic test data; The output includes test results of the average driving efficiency and the average recovery efficiency.

2. The new energy vehicle electric drive system efficiency test method according to claim 1 is characterized in that: The step of modifying the vehicle to be tested to obtain the modified vehicle comprises: The mechanical parts of the vehicle to be tested are dismantled, the electric control DC busbar is modified, and the control harness is modified to obtain a modified vehicle.

3. The new energy vehicle electric drive system efficiency testing method according to claim 1 is characterized in that: The test equipment at least includes a dynamometer, a power analyzer and a host computer; The modified vehicle is connected to the dynamometer, and when connected, the position of the dynamometer is moved to adjust the transmission shaft angle to a preset target value; The electric control DC bus of the modified vehicle is connected to the power analyzer through a current clamp, and the voltage lead of the modified vehicle is connected to the power analyzer; The control harness of the modified vehicle is connected to the host computer.

4. The new energy vehicle electric drive system efficiency test method according to claim 1, characterized in that: The pre-testing of the modified vehicle based on the test equipment includes: Outputting a preset resistance torque through the dynamometer in the test equipment so that the host computer controls the speed of the modified vehicle; Confirming that the wheel hub bearing of the modified vehicle rotates as a whole with the half shaft; Confirm that the signal acquisition of the test equipment is normal.

5. The new energy vehicle electric drive system efficiency testing method according to claim 1 is characterized in that: The static test of the modified vehicle to obtain static test data includes: controlling the electric drive speed and electric drive torque of the modified vehicle by means of a dynamometer in the test equipment; When the electric drive speed of the modified vehicle is stabilized at a preset electric drive speed, and the electric drive torque of the modified vehicle is stabilized at a preset electric drive torque, static test data is collected within a preset time period.

6. The new energy vehicle electric drive system efficiency testing method according to claim 1 is characterized in that: The step of performing a dynamic test on the modified vehicle to obtain dynamic test data includes: Obtain compensation resistance curve and working condition curve; According to the compensation resistance curve, simulating the road resistance of the whole vehicle at various vehicle speeds by means of a dynamometer in the test equipment; The speed of the modified vehicle is controlled, and dynamic test data is collected following the operating condition curve.

7. A new energy vehicle electric drive system efficiency test device, characterized in that: The new energy vehicle electric drive system efficiency test device comprises: A modification unit, used for modifying the vehicle to be tested to obtain a modified vehicle; a connecting unit, used to connect the modified vehicle to a test device; a pre-test unit, configured to perform a pre-test on the modified vehicle based on the test equipment; A first test unit, used for performing a static test on the modified vehicle to obtain static test data when the pre-test passes; A second testing unit is used to perform a dynamic test on the modified vehicle to obtain dynamic test data; a calculation unit, configured to calculate an average driving efficiency according to the static test data, and to calculate an average recovery efficiency according to the dynamic test data; The output unit is used to output the test results including the average driving efficiency and the average recovery efficiency.

8. The new energy vehicle electric drive system efficiency test device according to claim 7, characterized in that: The modification unit is specifically used to dismantle mechanical parts of the vehicle to be tested, modify the electric control DC bus and modify the control harness to obtain a modified vehicle.

9. An electronic device, characterized in that: The electronic device includes a memory and a processor, the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the new energy vehicle electric drive system efficiency test method according to any one of claims 1 to 6.

10. A readable storage medium, characterized in that: The readable storage medium stores computer program instructions, and when the computer program instructions are read and executed by a processor, the new energy vehicle electric drive system efficiency testing method according to any one of claims 1 to 6 is executed.

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