Method for determining test parameters of indirect effects of lightning on automobiles, test system and method

Abstract

The present invention relates to the field of automobile electromagnetic compatibility, and in particular, to a method, a test system and a method for determining parameters of an indirect effect test of automobile lightning. The method for determining parameters of an indirect effect test of automobile lightning comprises: determining the shape and size of an induction coil according to the size of the vehicle; the induction coil comprises two parallel coils; simulating the induction coil with a determined shape and size to determine a uniform magnetic field domain; determining the distance between the two coils according to the uniform magnetic field domain; collecting the magnetic field strength at a specified position in the area between the two coils after turning on a pulse magnetic field generator without placing a vehicle; and determining the setting parameters of the pulse magnetic field generator according to the magnetic field strength. The present invention can solve the problem of the lack of a method for testing the indirect effect of automobile lightning.

Description

Technical Field

[0001] The present invention relates to the field of automobile electromagnetic compatibility, and in particular to a method for determining test parameters of indirect lightning effects on an automobile, a test system and a method. Background Art

[0002] With the rapid development of new energy vehicles, the number of electronic and electrical components related to perception, communication, and control carried by vehicles has increased sharply. Once they are subject to strong electromagnetic interference, they are very likely to affect driving safety. In addition to the traditional narrowband radiated electromagnetic energy interference, electrical transient interference caused by conduction and coupling, the indirect effects of lightning striking near the vehicle also pose a potential huge threat to the vehicle. At present, the industry has no large-scale analysis of the indirect effects of automotive lightning, nor has it reached a unified test item, test method, and evaluation system for the indirect effects of automotive lightning.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] The object of the present invention is to provide a method for determining parameters of a test of indirect effects of lightning on an automobile, a test system and a method, so as to solve the problem of lack of a test method for indirect effects of lightning on an automobile in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a method for determining parameters of a vehicle lightning indirect effect test, comprising:

[0007] Determine the shape and size of the induction coil according to the size of the vehicle; the induction coil includes two parallel coils;

[0008] Simulate the induction coil with determined shape and size to determine the uniform magnetic field area;

[0009] Determining the distance between the two coils according to the uniform magnetic field domain;

[0010] In the case where no vehicle is placed, after the pulse magnetic field generator is turned on, the magnetic field strength at a specified position in the area between the two coils is collected;

[0011] According to the magnetic field strength, setting parameters of the pulsed magnetic field generator are determined.

[0012] As a further preferred technical solution, the simulation conditions are: the number of coil turns is 1, the magnetic permeability is 4×π×10 - 7 T×m / A, the signal source is a 4800A 8 / 20 μs current source.

[0013] As a further preferred technical solution, the designated position includes a center point and a corner point of the magnetic field uniform domain.

[0014] In a second aspect, the present invention provides a system for testing indirect effects of lightning on a vehicle, comprising a pulse magnetic field generator, a magnetic field sensor, an optical transmitter, a control room, an optical receiver, an oscilloscope and an induction coil;

[0015] The pulse magnetic field generator is used to output current waves to the induction coil; the induction coil includes two parallel coils;

[0016] The magnetic field sensor is used to measure the magnetic field strength at a specified position in the area between the two coils;

[0017] The optical transmitter, the optical receiver and the oscilloscope are connected in sequence, the optical transmitter is arranged in the area between the two coils, and the optical receiver and the oscilloscope are arranged in the control room;

[0018] The shape and size of the induction coil, the distance between the two coils, and the setting parameters of the pulse magnetic field generator are obtained by using the above-mentioned method for determining the parameters of the automobile lightning indirect effect test.

[0019] As a further preferred technical solution, the induction coil includes two parallel square coils, the side length of the square coil is 4.8-5.2 m, and the distance between the two square coils is 2.8-3.2 m.

[0020] As a further preferred technical solution, the system further includes a fixing groove opened below the ground, and the bottom end of the coil is arranged in the fixing groove.

[0021] In a third aspect, the present invention provides a method for testing the indirect effects of lightning on a vehicle, which is performed using the above-mentioned system for testing the indirect effects of lightning on a vehicle.

[0022] As a further preferred technical solution, the method comprises:

[0023] Place the vehicle across at least one of the coils, turn on the pulse magnetic field generator, and perform a longitudinal pulse magnetic field test; the output polarity of the pulse magnetic field generator is positive and negative, respectively, and the output polarity is not less than 3 pulses when both are positive and negative;

[0024] Place the vehicle between the two coils, turn on the pulse magnetic field generator, and perform a transverse pulse magnetic field test; the output polarity of the pulse magnetic field generator is positive and negative respectively, and no less than 3 pulses are output when the output polarity is positive and negative.

[0025] As a further preferred technical solution, when the size of the vehicle exceeds the size of the area between the two coils, the vehicle is tested in sections.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The method for determining the parameters of the indirect effect test of automobile lightning provided by the present invention first determines the shape and size of the induction coil based on the size of the vehicle; then simulates the induction coil with the determined shape and size to determine the uniform magnetic field domain; determines the distance between the two coils according to the uniform magnetic field domain; when the vehicle is not placed, after turning on the pulse magnetic field generator, collects the magnetic field strength at the specified position in the area between the two coils; and determines the setting parameters of the pulse magnetic field generator according to the magnetic field strength. The method can accurately obtain the shape and size of the coil, the distance between the coils, and the setting parameters of the pulse magnetic field generator, and points out the direction for the layout of the automobile lightning indirect effect test system and the execution of the test method. The method can use different parameters for different vehicles, and for convenience, the same parameters can be used for the same or different types of vehicles, which is highly flexible.

[0028] The automobile lightning indirect effect test system and test method provided by the present invention are established based on the parameters determined above, have high test reliability, can conveniently, accurately and effectively simulate the scenario where lightning strikes the vicinity of the vehicle to generate a strong magnetic field, can guide the implementation of electromagnetic compatibility performance verification of the vehicle under the indirect effect of lightning, discover potential risks of vehicle products in the research and development stage, and promote the improvement of vehicle electromagnetic compatibility quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 1 is a flow chart of a method for determining parameters of an indirect effect test of lightning on a vehicle provided in Example 1;

[0031] Figure 2 is a test result diagram obtained by performing a simulation test on a 5m×5m square coil in Example 1;

[0032] Figure 3 is a schematic diagram of the designated position when the coil is a square in Example 1;

[0033] Figure 4is a structural schematic diagram of a system for testing indirect effects of lightning on a vehicle provided in Example 2;

[0034] Figure 5 yes Figure 1 Schematic diagram of the connection structure between the induction coil and the fixed slot;

[0035] Figure 6 3 is a flow chart of a method for testing the indirect effects of lightning on a vehicle provided in Example 3;

[0036] Figure 7 is a vehicle layout diagram for the longitudinal pulse magnetic field test in Example 3;

[0037] Figure 8 This is the vehicle layout diagram for the transverse pulse magnetic field test in Example 3.

[0038] Icons: 1- pulsed magnetic field generator; 2- magnetic field sensor; 3- optical transmitter; 4- control room; 5- optical receiver; 6- oscilloscope; 7- induction coil; 8- insulating support platform; D- side length of square coil; d- distance between square coils. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Example 1

[0043] like Figure 1 As shown, this embodiment provides a method for determining parameters of a vehicle lightning indirect effect test, including:

[0044] S110. Determine the shape and size of the induction coil according to the size of the vehicle; the induction coil includes two parallel coils.

[0045] Optionally, the vehicle size in S110 includes the length, width and height of the vehicle. The vehicle can be a vehicle model, or a vehicle model of the same type (passenger vehicles such as sedans, SUVs, MPVs, etc., commercial vehicles such as VAN vehicles, trailers, etc.), or different types of vehicles. In order to facilitate the unification of coils, different types of vehicles can be used.

[0046] The above coils can be square, rectangular, circular or oval.

[0047] S120, simulating the induction coil with the determined shape and size to determine the uniform magnetic field domain.

[0048] The "uniform magnetic field region" refers to the region between the two coils where the ratio of the magnetic field strength is within the range of (0 to ±3dB), indicating that the magnetic field in this region is uniform.

[0049] S130: Determine the distance between the two coils according to the uniform magnetic field domain.

[0050] Optionally, the distance between the two coils is determined by the size of the uniform magnetic field domain. Specifically, if the width of the uniform magnetic field domain is 3 m, the distance between the two coils is 3 m.

[0051] S140. When no vehicle is placed, after turning on the pulse magnetic field generator, collecting the magnetic field strength at a specified position in the area between the two coils.

[0052] The magnetic field uniform domain obtained in step S120 is obtained through simulation, and the actual test may deviate from it, so actual calibration is required. When the vehicle is not placed, turn on the pulse magnetic field generator, and then collect the magnetic field strength at the specified position in the area between the two coils. The reason for collecting the magnetic field strength at the specified position is that these positions are representative and can characterize whether the magnetic field in the above-mentioned magnetic field uniform domain is uniform. There is no need to collect the magnetic field strength of all areas in the magnetic field uniform domain, which reduces the workload. When the pulse magnetic field generator is turned on, the magnetic field strength at the specified position should be within the range of (1000±100)A / m.

[0053] S150. Determine setting parameters of the pulsed magnetic field generator according to the magnetic field strength.

[0054] If, based on the above magnetic field strength, it is concluded that the magnetic field in the above magnetic field uniform domain is uniform, there is no need to adjust the setting parameters of the pulse magnetic field generator, and the subsequent automobile lightning indirect effect test can be carried out based on the setting parameters of the pulse magnetic field generator during the first calibration; if, based on the above magnetic field strength, it is concluded that the magnetic field in the above magnetic field uniform domain is non-uniform, it is necessary to adjust the setting parameters of the pulse magnetic field generator, and repeat S140 and S150 until the magnetic field in the above magnetic field uniform domain is uniform.

[0055] The above-mentioned method for determining the parameters of the indirect effect test of automobile lightning first determines the shape and size of the induction coil based on the size of the vehicle; then simulates the induction coil with the determined shape and size to determine the uniform magnetic field domain; determines the distance between the two coils according to the uniform magnetic field domain; without placing the vehicle, after turning on the pulse magnetic field generator, collects the magnetic field strength at the specified position in the area between the two coils; and determines the setting parameters of the pulse magnetic field generator according to the magnetic field strength. This method can accurately obtain the shape and size of the coil, the distance between the coils, and the setting parameters of the pulse magnetic field generator, and points out the direction for the layout of the automobile lightning indirect effect test system and the execution of the test method. This method can use different parameters for different vehicles, and for convenience, the same parameters can be used for the same or different types of vehicles, which is highly flexible.

[0056] Furthermore, the simulation conditions are: the number of coil turns is 1, the magnetic permeability is 4×π×10 -7 T×m / A, the signal source is a 4800A 8 / 20 μs current source, and the magnetic field generated in the coil is 1000A / m.

[0057] like Figure 2 The figure shows the test results of the simulation test of changing the distance between two coils of a 5m×5m square coil. The corresponding magnetic field range value in the uniform range of (0~±3dB) can be obtained. The calculation process is as follows: 20lg(x2 / x1)=3dB and 20lg(x2 / x1)=-3dB. Substituting x1=1000A / m into the formula, the range of x2 is 700A / m~1400A / m. Through simulation Figure 2 It can be seen that the uniform domain range requirement is met when the distance between the two coils is between 2.5 meters and 7.5 meters.

[0058] It is verified that the cube space of 3m×3m×3m (coil distance) of uniform magnetic field domain used in this design meets the requirements.

[0059] Furthermore, the designated position includes the center point and corner points of the magnetic field uniform domain. The "center point" refers to the geometric center point of the magnetic field uniform domain, and the "corner point" refers to the vertex on the boundary of the magnetic field uniform domain. For example, when the magnetic field uniform domain is a cube, the corner points are its 8 vertices. When the magnetic field uniform domain is a cylinder, the corner points are four symmetrical points on the circumference of its upper and lower bases.

[0060] like Figure 3 The figure shows a schematic diagram of the designated position when the coil is a square, and the positions 0#~8# in the figure are the above-mentioned designated positions.

[0061] Example 2

[0062] like Figure 4 , Figure 7 and Figure 8 As shown, this embodiment provides a system for testing indirect effects of lightning on a vehicle, including a pulse magnetic field generator 1, a magnetic field sensor 2, an optical transmitter 3, a control room 4, an optical receiver 5, an oscilloscope 6, an induction coil 7 and an insulating support platform 8;

[0063] The pulse magnetic field generator 1 is used to output current waves to the induction coil 7; the induction coil 7 includes two parallel coils, and the induction coil 7 is placed above the insulating support platform 8;

[0064] The magnetic field sensor 2 is used to measure the magnetic field strength at a specified position in the area between the two coils;

[0065] The optical transmitter 3, the optical receiver 5 and the oscilloscope 6 are connected in sequence, the optical transmitter 3 is arranged in the area between the two coils, and the optical receiver 5 and the oscilloscope 6 are arranged in the control room 4;

[0066] The shape and size of the induction coil 7 , the distance between the two coils, and the setting parameters of the pulse magnetic field generator 1 are obtained by using the method for determining the parameters of the indirect effect test of automobile lightning as described in Example 1.

[0067] Further, the induction coil includes two parallel square coils, the side length D of the square coil is 4.8-5.2m, and the distance d between the two square coils is 2.8-3.2m. In this embodiment, the square coil is used, and when the side length is 4.8-5.2m, it can cover the length of most passenger cars, and when the distance between the two square coils is 2.8-3.2m, it can cover the width of most passenger cars and commercial vehicles.

[0068] In another embodiment, if Figure 5 As shown, the system further comprises a fixing groove opened below the ground, and the bottom end of the coil is arranged in the fixing groove. In order to facilitate vehicle testing, the coil is arranged in the above fixing groove.

[0069] Example 3

[0070] like Figure 6 As shown, this embodiment provides a method for testing the indirect effects of lightning on a vehicle, which is tested using the system for testing the indirect effects of lightning on a vehicle described in Example 2. The method includes:

[0071] S210. Place the vehicle across at least one of the coils, turn on the pulse magnetic field generator, and perform a longitudinal pulse magnetic field test; the output polarity of the pulse magnetic field generator is positive and negative respectively, and no less than 3 pulses are output when the output polarity is positive or negative.

[0072] S220, placing the vehicle between the two coils, turning on the pulse magnetic field generator, and performing a transverse pulse magnetic field test; the output polarity of the pulse magnetic field generator is positive and negative respectively, and no less than 3 pulses are output when the output polarity is positive and negative.

[0073] Among them, Figure 7 As shown in the figure, "longitudinal pulse magnetic field test" refers to a pulse magnetic field test performed when the vehicle crosses at least one coil. Figure 8 As shown, the "transverse pulse magnetic field test" refers to a pulse magnetic field test performed when the vehicle is placed between two coils.

[0074] Furthermore, when the size of the vehicle exceeds the size of the area between the two coils, the vehicle is tested in sections. Testing in sections can ensure that all parts of the tested vehicle are located within the uniform magnetic field domain.

[0075] Optionally, the method further includes the following steps before S210:

[0076] Check the appearance and structural integrity of the vehicle;

[0077] Measure and record the test environment temperature and relative humidity;

[0078] Arrange the vehicle, and use an insulating support platform to support the vehicle; the insulating support platform should be made of insulating high-voltage resistant materials and isolated from the vehicle and the bottom of the coil;

[0079] Place magnetic field sensors at designated monitoring points outside the vehicle, connect the optical fiber transmission system, and complete optical fiber transmission debugging;

[0080] The output terminal of the pulse magnetic field generator is connected to the injection terminal of the magnetic field coil.

[0081] S210 and S220 also include the following steps:

[0082] Operate the pulse magnetic field generator, set the pulse magnetic field generator parameters to the setting parameters determined by the method of Example 1, and set a positive polarity test;

[0083] Monitor the current waveform output by the pulse magnetic field generator and the magnetic field monitoring waveform at the specified measurement point, and record them;

[0084] Observe the vehicle status during the test. If any abnormality occurs, stop the test immediately and continue only after analysis and confirmation of safety.

[0085] After S220, the following steps are also included: turning off the vehicle power supply and dismantling the test arrangement.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle lightning indirect effect test system, characterized in that: It includes a pulse magnetic field generator, a magnetic field sensor, an optical transmitter, a control room, an optical receiver, an oscilloscope and an induction coil; The pulse magnetic field generator is used to output current waves to the induction coil; the induction coil includes two parallel coils; The magnetic field sensor is used to measure the magnetic field strength at a specified position in the area between the two coils; The optical transmitter, the optical receiver and the oscilloscope are connected in sequence, the optical transmitter is arranged in the area between the two coils, and the optical receiver and the oscilloscope are arranged in the control room; The shape and size of the induction coil, the distance between the two coils, and the setting parameters of the pulse magnetic field generator are obtained by using a method for determining parameters of an indirect effect test of automobile lightning; The method for determining the parameters of the indirect effect test of automobile lightning comprises: determining the shape and size of the induction coil according to the size of the vehicle; the induction coil comprises two parallel coils; Simulate the induction coil with determined shape and size to determine the uniform magnetic field area; Determining the distance between the two coils according to the uniform magnetic field domain; In the case where no vehicle is placed, after the pulse magnetic field generator is turned on, the magnetic field strength at a specified position in the area between the two coils is collected; Determining setting parameters of the pulsed magnetic field generator according to the magnetic field strength; The system further comprises a fixing groove opened below the ground, and the bottom end of the coil is arranged in the fixing groove.

2. The automotive lightning indirect effect testing system according to claim 1, characterized in that: The induction coil comprises two parallel square coils, the side length of the square coil is 4.8-5.2 m, and the distance between the two square coils is 2.8-3.2 m.

3. The automotive lightning indirect effect testing system according to claim 1, characterized in that: The simulation conditions are: the number of coil turns is 1, the magnetic permeability is 4×π×10 -7 T×m / A, the signal source is a 4800A 8 / 20 μs current source.

4. The automotive lightning indirect effect testing system according to claim 1, characterized in that: The designated positions include the center point and corner points of the magnetic field uniformity domain.

5. A method for testing the indirect effects of lightning on a vehicle, characterized in that: The automobile lightning indirect effect testing system according to any one of claims 1 to 4 is used for testing.

6. The method for testing the indirect effects of lightning on a vehicle according to claim 5, characterized in that: The method comprises: Place the vehicle across at least one of the coils, turn on the pulse magnetic field generator, and perform a longitudinal pulse magnetic field test; the output polarity of the pulse magnetic field generator is positive and negative, respectively, and the output polarity is not less than 3 pulses when both are positive and negative; Place the vehicle between the two coils, turn on the pulse magnetic field generator, and perform a transverse pulse magnetic field test; the output polarity of the pulse magnetic field generator is positive and negative respectively, and no less than 3 pulses are output when the output polarity is positive and negative.

7. The method for testing the indirect effects of lightning on a vehicle according to claim 6, characterized in that: In case the dimensions of the vehicle exceed the dimensions of the area between two of the coils, the vehicle is tested in sections.

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