A digital test and evaluation method and device for automobile electromagnetic compatibility

Abstract

The present invention relates to the field of vehicle testing technology, and more specifically, to a digital automotive electromagnetic compatibility (EMC) testing and evaluation method and apparatus. The method comprises: determining the type of off-board interactive device based on a test scenario, and arranging the corresponding type of interactive device and antenna outside a reference vehicle; determining the degree of electromagnetic interference in communication between the reference vehicle and the interactive device; and determining the field strength of each sub-band received by the antenna; deriving weights for each sub-band in the test scenario based on the degree of electromagnetic interference and field strength according to calculation formulas for different limit intervals; collecting actual test waveforms for each sub-band emitted by the test vehicle, and obtaining an evaluation result for the test vehicle in the test scenario based on the actual test waveforms and weights. The present invention accurately reflects the impact of a vehicle's electromagnetic emissions on the outside world.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic compatibility technology, and in particular to a digital testing and evaluation method and device for automobile electromagnetic compatibility. Background Art

[0002] With advancements in the automotive industry and the continued acceleration of industrial development, automotive electromagnetic compatibility (EMC) issues are becoming increasingly prominent, and requirements for product EMC performance are becoming increasingly stringent. As the core location for EMC research and testing, EMC laboratories must continuously improve testing efficiency and accuracy to meet the growing demand for testing and electromagnetic safety verification.

[0003] The standard specifies emission intensity limits for electric vehicles' electromagnetic field emissions. For example, the magnetic field antenna is placed in a shielded room with absorbing material, and the intensity of the magnetic field received by the antenna is measured. If the magnetic field intensity is within the limit, the test requirement is met; if it is outside the limit, the test requirement is not met.

[0004] Existing testing methods rely on fixed limits and are not suitable for testing in various scenarios. Moreover, the test results are only pass or fail, which cannot reflect the impact of the vehicle's electromagnetic emissions on the outside world.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a digital test and evaluation method and device for automobile electromagnetic compatibility, so as to accurately reflect the impact of vehicle electromagnetic emissions on the outside world.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a digital test and evaluation method for automobile electromagnetic compatibility, comprising:

[0009] Determine the type of off-board interactive device based on the test scenario, and deploy the corresponding type of interactive device and antenna on the outside of the benchmark vehicle;

[0010] During the communication between the reference vehicle and the interactive device, determining the degree to which the communication is subject to electromagnetic interference; and determining the field strength of each sub-band received by the antenna;

[0011] According to the calculation formula of different limit intervals, the weight of each sub-band in the test scenario is obtained according to the degree of electromagnetic interference to the communication and the field strength fitting;

[0012] Collecting actual test waveforms of each sub-band emitted by the vehicle to be tested, and obtaining an evaluation result of the vehicle to be tested in the test scenario according to the actual test waveforms and weights;

[0013] The actual test waveform is a magnetic field intensity change curve or an electric field intensity change curve of different sub-frequency bands.

[0014] In a second aspect, the present invention provides an electronic device, comprising:

[0015] at least one processor, and a memory communicatively coupled to the at least one processor;

[0016] The memory stores instructions that can be executed by at least one of the processors. The instructions are executed by at least one of the processors to enable the at least one processor to perform a digital test and evaluation method for automobile electromagnetic compatibility.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention pre-arranges the corresponding type of interactive devices according to the test scenario, and determines the scores of different limit intervals according to the actual degree of electromagnetic interference to the interactive devices. This score reflects the actual electromagnetic interference to the interactive devices in different test scenarios; then, the weight of each sub-band is obtained based on the degree of electromagnetic interference to the communication and the field strength fitting, that is, the contribution of the magnetic field / electric field strength of different sub-bands to the final test results is obtained. When testing the vehicle to be tested, the actual test waveforms of each sub-band emitted by the vehicle to be tested are collected, and the evaluation results of the vehicle to be tested are obtained based on the actual test waveforms and weights. This evaluation result is the result under the aforementioned test scenario and takes into account the contribution of different sub-bands, which more accurately reflects the impact of the vehicle's electromagnetic emission on the outside world. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 1 is a flow chart of a digital test and evaluation method for automobile electromagnetic compatibility provided by an embodiment of the present invention;

[0021] Figure 2 This is a first schematic diagram of the limit interval provided by an embodiment of the present invention;

[0022] Figure 3 is a second schematic diagram of the limit interval provided by an embodiment of the present invention;

[0023] Figure 4It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0024] The following description of exemplary embodiments of the present invention is made in conjunction with the accompanying drawings, in which various details of the embodiments of the present invention are included to facilitate understanding. These details should be considered as merely exemplary. Therefore, it should be appreciated by those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0025] To clearly explain the method provided in this embodiment, we first introduce the existing vehicle electromagnetic emission testing apparatus and process. The vehicles in this embodiment are electric vehicles, such as pure electric vehicles, hybrid electric vehicles, and fuel cell electric vehicles. Taking magnetic field emission testing as an example, predefined magnetic field intensity emission limits are specified for different sub-frequency bands. For example, the standard limit for the sub-frequency band 0.15–4.77 MHz is 37.36–20 × lg(f) µA / m, where f is the frequency. The standard limits for multiple consecutive sub-frequency bands are connected to form a standard limit line, with the horizontal axis representing frequency and the vertical axis representing magnetic field intensity. The test site is a shielded room equipped with absorbing material. The test equipment includes a scanning receiver, a magnetic field antenna, and a dynamometer. The test steps include: 1) Setting the road load to match the vehicle's full load and operating the vehicle at a stable speed of 40 km / h. 2) Deploying the magnetic field antenna and recording measurement data in two directions of the magnetic field. 3) Scanning the magnetic field peak value on the vehicle's side with the highest emission. If the measured magnetic field intensity is below the limit line, the test passes.

[0026] The core idea of the present invention is to determine the weight of each sub-frequency band through the communication process between the vehicle and the interactive device, and reset the test standard based on the weight, so that test results can be obtained under different test scenarios, and the test results more accurately reflect the degree of influence of the vehicle's magnetic field / electric field emissions.

[0027] Example 1

[0028] Figure 1 This is a flow chart of a digital vehicle electromagnetic compatibility test and evaluation method provided by an embodiment of the present invention. This embodiment is applicable to test scenarios where a vehicle emits electromagnetic radiation. The method provided by this embodiment is executed by an electronic device.

[0029] See also Figure 1 , the method provided in this embodiment includes the following operations:

[0030] S110 : Determine the type of the off-vehicle interactive device according to the test scenario, and arrange the corresponding type of interactive device and antenna outside the reference vehicle.

[0031] The reference vehicle may be any electric vehicle, which is used to test and obtain the weight of each sub-band by communicating with an external interactive device.

[0032] When the reference vehicle primarily travels on urban roads, it primarily communicates with external roadside equipment. When the reference vehicle primarily travels in a convoy, it primarily communicates with other vehicles. Similarly, the interactive devices with which the reference vehicle communicates can be determined based on different test scenarios. This embodiment primarily tests the electromagnetic intensity emitted by the vehicle to external interactive devices; in other words, the electromagnetic energy emitted by the vehicle is primarily quantitatively described by the interference it causes to the interactive devices.

[0033] To test the impact of a vehicle's electromagnetic emissions on the outside world under various test scenarios, the following tests can be performed on the vehicle's external interaction device for each test scenario to determine the weighting of each sub-band in each scenario. During the specific test, the interaction device and antenna (including monopole antennas and loop antennas) are placed in a shielded room with absorbing material. For example, the interaction device is placed 1 meter from the reference vehicle. The interaction device has a built-in full-band sensitive antenna to receive electromagnetic interference from the vehicle.

[0034] S120 . During the communication between the vehicle and the interactive device, determine the degree to which the communication is affected by electromagnetic interference; and determine the field strength of each sub-band received by the antenna.

[0035] The principle of sub-band division needs to be broken down in combination with services / bands, such as: broadcasting services / bands, mobile services / bands.

[0036] The degree of electromagnetic interference experienced by an interactive device is determined based on the signal-to-noise ratio (SNR) of the communication signal received by the device across the entire frequency band. For example, based on antenna performance requirements, a SNR of 150dB is assigned a score of 100, while a SNR of -6dB is assigned a score of 0. Other SNR scores are assigned proportionally between 0 and 100. The scores for each sub-band are then weighted and averaged to produce the overall score.

[0037] Based on the above description, the score of electromagnetic interference of communication is obtained according to the actual signal-to-noise ratio of the signal received by the antenna; the higher the signal-to-noise ratio, the higher the score, and the score within the entire frequency band is obtained.

[0038] The field strength of each sub-band, namely the electric field strength and magnetic field strength, can also be measured through the antenna in the shielded room.

[0039] S130. According to calculation formulas for different limit intervals, and based on the degree of electromagnetic interference to communications and field strength fitting, obtain the weight of each sub-band in the test scenario.

[0040] Set multiple dividing lines above the standard limit line and multiple dividing lines below the standard limit line. The uppermost dividing line is the highest limit interval, the limit interval is formed between two adjacent dividing lines, the limit interval is formed between the dividing line and the adjacent standard limit line, and the lowermost dividing line is the lowest limit interval.

[0041] Figure 2 is a first schematic diagram of the limit interval provided by an embodiment of the present invention, Figure 3 2 is a second schematic diagram of the limit intervals provided by the embodiment of the present invention. A plurality of limit intervals are drawn in advance above and below the prescribed standard limit line. Figure 2 and Figure 3 The same limit range and test waveform are shown, only Figure 2 and Figure 3 Different contents are highlighted in the text. Figure 2 and Figure 3 You can watch them in comparison. Figure 2 and Figure 3 The horizontal axis is frequency (f), and the vertical axis is magnetic field intensity (E) or electric field intensity (H). Figure 2 , set four dividing lines (green dashed lines) below the standard limit line (black broken line), from top to bottom: L3, L2, L1, L0, and four dividing lines (red dashed lines) above the standard limit line, from top to bottom: H0, H1, H2, H3. Above the top dividing line H0 is a limit interval, and between two adjacent dividing lines forms a limit interval. Between a dividing line (H3 or L3) and the adjacent standard limit line forms a limit interval. Below the bottom dividing line L0 is a limit interval, forming a total of 10 limit intervals, numbered 10 to 1 from top to bottom. Figure 3 The blue line shows the fifth limit interval divided by different sub-bands, and the black curve is the test waveform. It can be seen that the test waveforms of different sub-bands fall within different limit intervals.

[0042] The electric field strength and magnetic field strength of each sub-band obtained in S120 are plotted to obtain a benchmark test waveform. It can be seen that multiple benchmark test waveforms will be obtained under different vehicle models and different test scenarios. For different sub-bands of any benchmark test waveform, it will fall within a certain limit interval or even multiple limit intervals. In order to simplify the calculation, this embodiment selects the calculation formula for the evaluation result based on the highest limit interval (called the target limit interval) where any point in the benchmark test waveform falls, wherein any point can fall within the highest limit interval or on the upper edge line of the highest limit interval (such as the upper dividing line or the upper standard limit line). In other words, if the point falls on the aforementioned standard limit line or dividing line, the first limit interval below the standard limit line or dividing line is used as the target limit interval. For example Figure 3In the first sub-band of the benchmark waveform, there is a mutation point (f i , E i / H i ) falls into the fifth limit interval, and the waveform segment corresponding to the yellow edge in the last sub-band falls into the fifth limit interval. If the remaining points in the benchmark test waveform fall into the fourth limit interval or lower, the calculation formula corresponding to the highest fifth limit interval is selected. Based on the calculation formula for this limit interval and the communication electromagnetic interference score, the weights of each sub-band in a specific test scenario are fitted.

[0043] Specifically, if the target limit interval is below the standard limit line, the evaluation result is obtained using the following formula:

[0044] A m +10×{1-(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 )}; formula (1)

[0045] Among them, A m is a constant related to the target limit interval; n is the number of sub-bands; K n is the weight of the nth sub-band, K1+K2+...+K n =1; see Figure 3 , S n总 The target limit interval (i.e., the 5th limit interval) is the area of the nth sub-band, that is, the area between the upper and lower boundaries of the target limit interval and the left and right frequency lines of the nth sub-band (the rectangular area filled with blue and yellow). The target limit interval is the highest limit interval within which any point in the benchmark test waveform falls. Figure 3 In the benchmark test waveform, the highest limit interval that any point falls into is the fifth limit interval; S n The reference test waveform segment of the nth sub-band is the same as S n总 The overlapping area is indicated by yellow fill.

[0046] If the target limit interval is above the standard limit line and is not the highest limit interval, the following formula is used to obtain the evaluation result:

[0047] B j -10×(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 ); formula (2)

[0048] Among them, B j is a constant related to the target limit interval, and the interpretation of other parameters is the same as that of formula (1).

[0049] If the target limit interval is the upper limit interval, the evaluation result is C; C is a constant.

[0050] The interval between two adjacent dividing lines or standard limit lines and their adjacent upper and lower dividing lines is :

[0051] ;Formula (3)

[0052] in, is the field strength value corresponding to the standard limit line, that is, Figure 2 The black solid line in the middle shows the electric field / magnetic field value corresponding to each frequency point. is the field strength value corresponding to the lowest dividing line, that is Figure 2 The electric field / magnetic field value corresponding to the lowest dividing line L0 at each frequency point. B and L min The difference between them is equal to 4 times the interval .

[0053] L min The following conditions are met:

[0054] L min -L 实验室底噪 ≥6dB; formula (4)

[0055] Among them, L 实验室底噪 is the noise level inherent in the laboratory environment.

[0056] The setting of the dividing lines of each limit interval needs to be combined with multiple factors such as peak limit, laboratory noise floor, and test environment noise requirements to ensure that a certain margin is left to ensure measurement accuracy and reliability while taking into account the laboratory noise floor.

[0057] S n It is calculated based on the sum of the areas occupied by the single frequency point with mutation and the relatively continuous test waveform in the target limit range. The area occupied by the single frequency point with mutation in the target limit range is calculated using the following formula:

[0058] ;Formula (5)

[0059] Among them, E i is the field strength of the ith frequency point within the target limit interval relative to the target limit interval, that is, the height occupied by the ith frequency point within the target limit interval; s iis the unit frequency step of the ith frequency point; S 单频点 is the area occupied by the i-th frequency point in a certain limit interval.

[0060] When the overall benchmark waveform is below the dividing line L0, the score (i.e., evaluation result) is:

[0061] A0+10×{1-(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 )}; Formula (6)

[0062] When any point in the benchmark test waveform falls within the second limit interval, the score (i.e., evaluation result) is obtained using the following formula:

[0063] A1+10×{1-(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 )}; Formula (7)

[0064] When any point in the benchmark test waveform falls within the third limit interval, the score (i.e., evaluation result) is obtained using the following formula:

[0065] A2+10×{1-(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 )}; Formula (8)

[0066] When any point in the benchmark test waveform falls within the fourth limit interval, the score (i.e., evaluation result) is obtained using the following formula:

[0067] A3+10×{1-(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 )}; Formula (9)

[0068] When any point in the benchmark test waveform falls within the fifth limit interval, the score (i.e., evaluation result) is obtained using the following formula:

[0069] A4+10×{1-(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 )}; Formula (10)

[0070] When any point in the benchmark test waveform falls within the sixth limit interval, the score (i.e., evaluation result) is obtained using the following formula:

[0071] B1-10×(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 ); formula (11)

[0072] When any point in the benchmark test waveform falls within the highest limit interval of the seventh limit interval, the score (i.e., evaluation result) is obtained using the following formula:

[0073] B2-10×(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 ); formula (12)

[0074] When any point in the benchmark test waveform falls within the eighth limit interval, the score (i.e., evaluation result) is obtained using the following formula:

[0075] B3-10×(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 ); formula (13)

[0076] When any point in the benchmark test waveform falls within the ninth limit interval, the score (i.e., evaluation result) is obtained using the following formula:

[0077] B4-10×(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n Sn / S n总 ); formula (14)

[0078] When the benchmark test waveform as a whole is higher than the dividing line H0, that is, the target limit interval of the test waveform is the upper limit interval, the score (i.e., the evaluation result) is: C, where C is a constant.

[0079] Constant A related to the target limit interval m In this embodiment, they are specifically A0, A1, A2, A3, and A4, and the constant B related to the target limit range j In this embodiment, they are specifically B1, B2, B3, and B4, and satisfy the following relationship:

[0080] A0>A1>A2>A3>A4>B1>B2>B3>B4>C; Formula (15)

[0081] In this step, the corresponding formula is selected from formula (6) to formula (14) according to the target limit range of the benchmark test waveform, and the score of electromagnetic interference between the vehicle and the interactive device is directly used as the evaluation result, that is, the calculation result of the selected formula. The S1~S in the formula are calculated based on the data points in the benchmark test waveform. n and S 1总 ~S n总 When there are multiple benchmark test waveforms, multiple formulas can be combined to fit the weights of each sub-band to obtain the weight values.

[0082] It should be noted that if the overall benchmark test waveform is higher than the dividing line H0, since it uses the constant C as the evaluation result and is independent of the weights of each sub-band, the benchmark test waveform does not participate in the weight fitting operation.

[0083] S140 , collecting actual test waveforms of each sub-frequency band emitted by the vehicle to be tested, and obtaining an evaluation result of the vehicle to be tested in the test scenario according to the actual test waveforms and weights.

[0084] For the vehicle to be tested, the conventional vehicle electromagnetic emission test process needs to be carried out. There is no need to arrange interactive equipment in the shielded room. The rest of the configuration is the same as that in S110. Calculate S1~S based on the actual test waveform obtained in this test. n and S 1总 ~S n总 , select the appropriate formula from formula (6) to formula (14) according to the target limit range of the actual test waveform, and use the weights obtained by fitting in the above steps and S1~S calculated according to the actual test waveform to calculate n and S 1总 ~S n总Substitute it into the selected formula to obtain the score as the evaluation result. The only difference is that S140 uses the actual test waveform for score calculation, while S130 uses the benchmark test waveform for score calculation. The calculation formula is the same, for example:

[0085] The evaluation results of the vehicle under test in the test scenario are obtained based on the actual test waveform and weights, including:

[0086] If the target limit interval of the actual test waveform is below the standard limit line, the evaluation result of the vehicle under test is obtained using the following formula:

[0087] A m +10×{1-(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 )}; Formula (16)

[0088] If the target limit interval of the actual test waveform is above the standard limit line and is not within the upper limit interval, the evaluation result of the vehicle under test is obtained using the following formula:

[0089] B j -10×(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 ); formula (17)

[0090] Among them, A m 、B j is a constant related to the target limit interval; n is the number of sub-bands; K n is the weight of the nth sub-band; S n The actual test waveform segment of the nth sub-band and S n总 The overlapping area; S n总 is the area of the target limit interval in the nth sub-frequency band; the target limit interval is the highest limit interval within which any point in the actual test waveform falls.

[0091] If the target limit interval where the actual test waveform is located is the upper limit interval, the evaluation result of the vehicle to be tested is a constant C.

[0092] It should be noted that different weights can be obtained in different test scenarios. Therefore, the vehicle under test only needs to go through the test process once. By substituting the weights corresponding to the test scenarios into the formula, the evaluation results under different test scenarios can be obtained, which improves testing efficiency.

[0093] The present invention pre-arranges the corresponding type of interactive devices according to the test scenario, and determines the scores of different limit intervals according to the actual degree of electromagnetic interference to the interactive devices. This score reflects the actual electromagnetic interference to the interactive devices in different test scenarios; then, the weight of each sub-band is obtained based on the degree of electromagnetic interference to the communication and the field strength fitting, that is, the contribution of the magnetic field / electric field strength of different sub-bands to the final test results is obtained. When testing the vehicle to be tested, the actual test waveforms of each sub-band emitted by the vehicle to be tested are collected, and the evaluation results of the vehicle to be tested are obtained based on the actual test waveforms and weights. This evaluation result is the result under the aforementioned test scenario and takes into account the contribution of different sub-bands, which more accurately reflects the impact of the vehicle's electromagnetic emission on the outside world.

[0094] Example 2

[0095] This embodiment further optimizes the weights of each sub-frequency band obtained through fitting based on the above embodiment. Specifically, benchmark test waveforms obtained from electromagnetic emission tests on various vehicle models are collected; the dispersion of the benchmark test waveforms within the maximum limit range in each sub-frequency band is calculated; and the weights of each sub-frequency band are modified based on the dispersion.

[0096] For example, 30 vehicle models are tested for electromagnetic emission, and the test waveform corresponding to each model is collected. Assume that there are 10 limit intervals and 100 sub-frequency bands. The test waveform segments corresponding to different sub-frequency bands will fall within different limit intervals. Different limit intervals for each sub-frequency band will fall into different numbers of test waveform segments. This embodiment counts the dispersion of the highest limit interval that the test waveform falls into in each sub-frequency band, for example, see Figure 3 , there is a mutation point (f i , E i / H i) falls into the 5th limit interval, and the rest of the points in the first sub-frequency band fall into the 1st limit interval, then the highest 5th limit interval is taken in the first sub-frequency band. Then, each benchmark test waveform can obtain a unique maximum limit interval in each sub-frequency band. Taking into account that this embodiment includes 30 test waveforms obtained by testing 30 types of vehicles, 30 maximum limit intervals can be obtained in each sub-frequency band. The dispersion of the 30 maximum limit intervals of each sub-frequency band is calculated to determine whether the 30 maximum limit intervals are concentrated or dispersed. Optionally, the average distance between the maximum limit intervals where the benchmark test waveform falls in each sub-frequency band is calculated as the dispersion. Of course, the covariance or information entropy can also be used to calculate the dispersion of multiple maximum limit intervals.

[0097] The weights obtained by the above fitting are corrected according to the dispersion of each curve in each sub-band. Optionally, if the upper limit interval is concentrated, the weight of the sub-band obtained by fitting is reduced. The higher the concentration (the lower the dispersion), the greater the reduction. If the upper limit interval is dispersed, the weight of the sub-band obtained by fitting is increased. The higher the dispersion, the greater the increase. In this way, the scores of each model can reflect the differences between different models. For example, the dispersion is normalized to the range of 0.1~0.9. The higher the value, the more dispersed. 0.5 is the dividing point between dispersion and concentration. Then, when the dispersion is 0.1~0.4, the weight obtained by fitting should be reduced; when the dispersion is 0.6~0.9, the weight obtained by fitting should be increased.

[0098] Example 3

[0099] like Figure 4 As shown, this embodiment provides an electronic device, including:

[0100] at least one processor; and

[0101] a memory communicatively connected to at least one of the processors; wherein,

[0102] The memory stores instructions executable by at least one processor, and the instructions are executed by at least one processor to enable at least one processor to perform the above method. At least one processor in the electronic device is capable of performing the above method, thereby having at least the same advantages as the above method.

[0103] Optionally, the electronic device also includes interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed in the electronic device, including instructions stored in or on the memory to display graphical information of a GUI (Graphical User Interface) on an external input / output device (such as a display device coupled to the interface). In other embodiments, if necessary, multiple processors can be used with multiple memories, and / or multiple buses can be used with multiple memories. Similarly, multiple electronic devices can be connected (for example, as a server array, a group of blade servers, or a multi-processor system), with each device providing part of the necessary operations. Figure 4 A processor 301 is taken as an example.

[0104] Memory 302, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the automotive electromagnetic compatibility digital testing and evaluation method in the embodiments of the present invention. Processor 301 executes the software programs, instructions, and modules stored in memory 302 to perform various functional applications and data processing of the device, thereby implementing the aforementioned automotive electromagnetic compatibility digital testing and evaluation method.

[0105] The memory 302 may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data created based on the use of the terminal, etc. Furthermore, the memory 302 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 302 may further include a memory remotely located relative to the processor 301, and these remote memories may be connected to the device via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0106] The electronic device may further include: an input device 303 and an output device 304. The processor 301, the memory 302, the input device 303 and the output device 304 may be connected via a bus or other means. Figure 4 The bus connection is taken as an example.

[0107] The input device 303 can receive input digital or character information, and the output device 304 can include a display device, an auxiliary lighting device (e.g., an LED), a tactile feedback device (e.g., a vibration motor), etc. The display device may include, but is not limited to, a liquid crystal display (LCD), a light-emitting diode (LED) display, and a plasma display. In some embodiments, the display device may be a touch screen.

[0108] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in the present invention can be achieved. This is not limited herein.

[0109] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A digital test and evaluation method for automobile electromagnetic compatibility, characterized in that: include: Determine the type of off-board interactive device based on the test scenario, and deploy the corresponding type of interactive device and antenna on the outside of the benchmark vehicle; During communication between the reference vehicle and the interactive device, determining the extent to which the communication is subject to electromagnetic interference; and determining the field strength of each sub-frequency band received by the antenna; According to the calculation formula of different limit intervals, the weight of each sub-band in the test scenario is obtained according to the degree of electromagnetic interference to the communication and the field strength fitting; Collecting actual test waveforms of each sub-band emitted by the vehicle to be tested, and obtaining an evaluation result of the vehicle to be tested in the test scenario according to the actual test waveforms and weights; The actual test waveform is a magnetic field intensity change curve or an electric field intensity change curve of different sub-frequency bands; Obtaining an evaluation result of the vehicle under test in the test scenario according to the actual test waveform and the weight, including: If the target limit interval of the actual test waveform is below the standard limit line, the evaluation result of the vehicle under test is obtained using the following formula: A m +10×{1-(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 )}; If the target limit interval of the actual test waveform is above the standard limit line and is not within the upper limit interval, the evaluation result of the vehicle under test is obtained using the following formula: B j -10×(K1S1 / S 1总 +K2S2 / S 2总 +K3S3 / S 3总 +...+K n S n / S n总 ); If the target limit interval where the actual test waveform is located is the upper limit interval, the evaluation result of the vehicle to be tested is C; Among them, multiple dividing lines above the standard limit line and multiple dividing lines below the standard limit line are set. The uppermost dividing line is the highest limit interval, the interval between two adjacent dividing lines constitutes the limit interval, the interval between the dividing line and the adjacent standard limit line constitutes the limit interval, and the interval below the lowest dividing line is the lowest limit interval; m 、B j is a constant related to the target limit interval; C is a constant, n is the number of sub-bands; K n is the weight of the nth sub-band, K1+K2+...+K n =1;S n The actual test waveform segment of the nth sub-band and S n总 The overlapping area; S n总 is the area of the target limit interval in the nth sub-band; the target limit interval is the maximum limit interval within which any point in the actual test waveform falls, wherein any point falling within the position of the maximum limit interval includes: falling within the maximum limit interval or falling on the upper edge line of the maximum limit interval.

2. The method according to claim 1, characterized in that S n It is calculated based on the sum of the areas occupied by the sudden single frequency point and the relatively continuous test waveform in the target limit range. The area occupied by the sudden single frequency point in the target limit range is calculated using the following method: ； Among them, E i is the field strength of the ith frequency point within the target limit interval relative to the target limit interval, s i is the unit frequency step of the ith frequency point; S 单频点 is the area occupied by the i-th frequency point within the target limit interval.

3. The method according to claim 2, characterized in that Different limit intervals are determined in the following way: Take 4 dividing lines above the standard limit line, and take 4 dividing lines below the standard limit line; The intervals between two adjacent dividing lines or the standard limit line and its upper and lower adjacent dividing lines are : ； in, is the field strength value corresponding to the standard limit line, is the field strength value of the lowest dividing line, L at the same frequency point B and L min The difference between them is equal to 4 times the interval .

4. The method according to claim 3, characterized in that During the communication between the reference vehicle and the interactive device, determining the degree to which the communication is subject to electromagnetic interference includes: The degree of electromagnetic interference to the communication can be determined based on the signal-to-noise ratio of the communication signal.

5. The method according to claim 3, characterized in that L min The following conditions are met: L min -L 实验室底噪 ≥6dB; Among them, L 实验室底噪 is the noise level inherent in the laboratory environment.

6. The method according to any one of claims 1 to 5, characterized in that After obtaining the weights of each sub-band in the test scenario based on the calculation formulas for different limit intervals and the degree of electromagnetic interference to the communication and the field strength fitting, the following is also included: Collect benchmark test waveforms obtained after electromagnetic emission tests on various vehicle models; Statistical benchmark waveform dispersion within the maximum limit range in each sub-frequency segment; The weight of each sub-frequency band is modified according to the dispersion.

7. An electronic device, characterized in that: include: at least one processor, and a memory communicatively coupled to the at least one processor; The memory stores instructions that can be executed by at least one of the processors. The instructions are executed by at least one of the processors to enable the at least one processor to execute the automotive electromagnetic compatibility digital testing and evaluation method according to any one of claims 1 to 6.

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