A charging pile performance testing method and system

Abstract

The present invention relates to the field of charging pile testing technology, and in particular to a charging pile performance testing method and system, the method comprising: using a voltage sensor to test the working performance of the charging pile, using an oscilloscope to detect the communication performance of the charging pile, and using a temperature sensor to detect the temperature inside the charging pile; judging the test stability of the working performance of the charging pile based on the variance of the fluctuation amplitude of the working voltage of the charging pile; if the test stability does not meet the requirements, determining the cutoff frequency of the filter in the charging pile; if the communication performance does not meet the requirements, determining the retransmission interval duration of the communication signal of the charging pile; based on the retransmission interval duration of the communication signal of the determined charging pile and the charging power, retesting the working performance of the charging pile until it is qualified. The present invention improves the test stability of the working performance of the charging pile.

Description

Technical Field

[0001] The present invention relates to the technical field of charging pile testing, and in particular to a charging pile performance testing method and system. Background Art

[0002] In the prior art, electric vehicles are seen as the development trend of the next generation of automobiles. As a "gas station" for electric vehicles, charging piles are equivalent to gas pumps in gas stations. They charge various types of electric vehicles according to different voltage levels. They can be fixed on the ground or wall and installed in public buildings such as shopping malls, public parking lots, and charging stations. According to the communication between the charger and the battery management system on the vehicle, the power converter can adjust the DC charging power online, and the charger can display the charging voltage, charging current, charging amount and charging fee. This is only the basic principle of the charging pile. With the continuous development of electric vehicles, the use of charging piles has also increased. How to provide electric vehicles with fast, efficient and safe charging services, the charging performance and safety of the charging piles are the primary concerns. The daily maintenance of the charging piles only relies on manual routine performance inspections, and it is impossible to timely understand the internal usage status of the charging piles.

[0003] Chinese Patent Publication No.: CN114295925A discloses a charging pile performance test method and system, the method comprising: obtaining first position distribution information of a first charging pile; reading historical usage data of the first charging pile to obtain historical usage data and basic information of the first charging pile; obtaining a first expected performance of the first charging pile based on the historical usage data and basic information; generating a first performance detection scheme based on the first position distribution information and the basic information; performing a performance detection of the first charging pile based on the first performance detection scheme to obtain a first performance detection result; performing a performance evaluation of the first charging pile based on the first performance detection result and the first expected performance to obtain a first performance test result. It can be seen that the charging pile performance test method and system have the problem that the poor contact of the connector in the power supply line causes poor current transmission, thereby causing a decrease in the test stability of the working performance of the charging pile. Summary of the invention

[0004] To this end, the present invention provides a charging pile performance testing method and system to overcome the problem in the prior art that poor contact of a connector in a power line results in poor current transmission, thereby causing a decrease in the testing stability of the charging pile working performance.

[0005] To achieve the above-mentioned purpose, the present invention provides a charging pile performance testing method, comprising: using a voltage sensor to test the working performance of the charging pile, using an oscilloscope to detect the communication performance of the charging pile, and using a temperature sensor to detect the temperature inside the charging pile, wherein the working performance includes the working voltage of the charging pile, and the communication performance includes the transmission rate of the communication signal of the charging pile and the retransmission interval of the communication signal of the charging pile; obtaining the working voltage of the charging pile within several test cycles; judging the test stability of the working performance of the charging pile based on the variance of the fluctuation amplitude of the working voltage of the charging pile; if the test stability does not meet the requirements, determining the cutoff frequency of the filter in the charging pile or determining the communication performance of the charging pile based on the variance of the fluctuation amplitude of the working voltage of the charging pile and the average transmission rate of the communication signal of the charging pile; if the communication performance does not meet the requirements, determining the retransmission interval of the communication signal of the charging pile or determining the charging power of the charging pile based on the average transmission rate of the communication signal of the charging pile and the temperature rise rate inside the charging pile; retesting the working performance of the charging pile based on the determined retransmission interval of the communication signal of the charging pile and the charging power until it is qualified.

[0006] Furthermore, the test stability of the working performance of the charging pile is determined, including:

[0007] Obtaining the working voltage of the charging pile during several test cycles, and comparing the variance of the fluctuation amplitude of the working voltage of the charging pile;

[0008] Comparing the variance of the fluctuation amplitude of the working voltage of the charging pile with a preset first variance;

[0009] If the variance of the fluctuation amplitude of the working voltage of the charging pile is greater than the preset first variance, it is determined that the test stability of the working performance of the charging pile does not meet the requirements.

[0010] Furthermore, the communication performance of the charging pile is determined, including:

[0011] Comparing the variance of the fluctuation amplitude of the working voltage of the charging pile with the preset first variance and the preset second variance respectively;

[0012] If the variance of the fluctuation amplitude of the working voltage of the charging pile is greater than the preset first variance and less than or equal to the preset second variance, it is preliminarily determined that the communication performance of the charging pile does not meet the requirements, and whether the communication performance of the charging pile meets the requirements is determined based on the average transmission rate of the communication signal of the charging pile.

[0013] Furthermore, the cutoff frequency of the filter in the charging pile is determined, including:

[0014] Comparing the variance of the fluctuation amplitude of the working voltage of the charging pile with the preset second variance;

[0015] If the variance of the fluctuation amplitude of the working voltage of the charging pile is greater than the preset second variance, the cutoff frequency of the filter in the charging pile is increased.

[0016] Furthermore, the increase range of the cut-off frequency of the filter in the charging pile is determined by the difference between the variance of the fluctuation amplitude of the working voltage of the charging pile and a preset second variance.

[0017] Furthermore, the retransmission interval duration of the communication signal of the charging pile is determined, including:

[0018] Obtaining the transmission rate of the communication signal of the charging pile in several transmission cycles, and calculating the average transmission rate of the communication signal of the charging pile;

[0019] Comparing the average transmission rate of the communication signal of the charging pile with the preset first transmission rate and the preset second transmission rate respectively;

[0020] If the average transmission rate of the communication signal of the charging pile is greater than the preset first transmission rate, it is determined that the communication performance of the charging pile does not meet the requirements;

[0021] If the average transmission rate of the communication signal of the charging pile is greater than the preset first transmission rate and less than or equal to the preset second transmission rate, then increasing the retransmission interval of the communication signal of the charging pile;

[0022] If the average transmission rate of the communication signal of the charging pile is greater than the preset second transmission rate, it is preliminarily determined that the environmental stability of the charging pile does not meet the requirements, and whether the environmental stability of the charging pile meets the requirements is determined based on the temperature rise rate inside the charging pile.

[0023] Furthermore, the increase range of the retransmission interval duration of the communication signal of the charging pile is determined by the difference between the average transmission rate of the communication signal of the charging pile and the preset first transmission rate.

[0024] Furthermore, the charging power of the charging pile is determined, including:

[0025] Obtain the temperature inside the charging pile in a single cycle and calculate the temperature increase rate inside the charging pile;

[0026] Comparing the temperature increase rate inside the charging pile with a preset temperature increase rate;

[0027] If the temperature increase rate inside the charging pile is greater than the preset increase rate, it is determined that the environmental stability of the charging pile does not meet the requirements, and the charging power of the charging pile is reduced.

[0028] Furthermore, the reduction range of the charging power of the charging pile is determined by the difference between the temperature increase rate inside the charging pile and a preset temperature increase rate.

[0029] The present invention also provides a charging pile performance testing system, comprising:

[0030] A test connection module, used to connect to a charging pile for testing, including a filter arranged inside the charging pile for filtering high-frequency signals of an input power supply of the charging pile and a signal transmitter arranged inside the charging pile for transmitting a communication signal;

[0031] A test module, which is connected to the test connection module, and includes a voltage sensor arranged inside the charging pile housing to detect the working voltage of the charging pile, an oscilloscope connected to the signal transmitter to detect the transmission rate of the communication signal, and a temperature sensor arranged inside the charging pile housing to detect the temperature inside the charging pile;

[0032] A control module, which is connected to the test connection module and the test module respectively, and is used to determine whether the test stability of the working performance of the charging pile meets the requirements according to the variance of the fluctuation amplitude of the working voltage of the charging pile, and when it does not meet the requirements, determine the cutoff frequency of the filter in the charging pile or determine the retransmission interval of the communication signal of the charging pile according to the average transmission rate of the communication signal of the charging pile, and determine the charging power of the charging pile according to the average transmission rate of the communication signal of the charging pile and the temperature rise rate inside the charging pile.

[0033] Compared with the prior art, the beneficial effect of the present invention lies in that the method of the present invention determines the cutoff frequency of the filter in the charging pile according to the variance of the fluctuation amplitude of the working voltage of the charging pile. Due to the poor contact of the connector in the power line, the current transmission is not smooth, which causes the voltage to fluctuate. By increasing the cutoff frequency of the filter in the charging pile, the high-frequency signal entering the charging pile is filtered out, thereby reducing the voltage fluctuation. The retransmission interval duration of the communication signal of the charging pile is determined according to the average transmission rate of the communication signal of the charging pile. Since the position of the charging pile may be close to the transformer, the communication signal sent by the charging pile is interfered, thereby causing the transmission rate of the communication signal of the charging pile to change. By increasing the retransmission interval duration of the communication signal of the charging pile, the situation of retransmission conflict caused by interference is reduced. The charging power of the charging pile is determined according to the temperature increase rate inside the charging pile. Due to long-term use, dust and dirt are accumulated at the heat dissipation port of the charging pile, resulting in blockage of some heat dissipation ports, thereby causing the temperature inside the charging pile to rise during operation. By reducing the charging power of the charging pile, the heat generated inside the charging pile is reduced, and the test stability of the working performance of the charging pile is improved.

[0034] Furthermore, the method of the present invention determines the cutoff frequency of the filter in the charging pile by setting a preset first variance and a preset second variance. Due to poor contact of the connector in the power supply line, the current transmission is not smooth, which causes voltage fluctuations. By increasing the cutoff frequency of the filter in the charging pile, the high-frequency signal entering the charging pile is filtered out, thereby reducing voltage fluctuations and further improving the test stability of the working performance of the charging pile.

[0035] Furthermore, the method of the present invention determines the retransmission interval duration of the communication signal of the charging pile by setting a preset first transmission rate and a preset second transmission rate. Since the location of the charging pile may be close to the transformer, the communication signal emitted by the charging pile is interfered, thereby causing the transmission rate of the communication signal of the charging pile to change. By increasing the retransmission interval duration of the communication signal of the charging pile, the situation of retransmission conflicts due to interference is reduced, thereby further improving the test stability of the working performance of the charging pile.

[0036] Furthermore, the method of the present invention determines the charging power of the charging pile by setting a preset increase rate. Due to long-term use, dust and dirt accumulate at the heat dissipation ports of the charging pile, causing some heat dissipation ports to be blocked, thereby causing the internal temperature of the charging pile to increase during operation. By reducing the charging power of the charging pile, the heat generated inside the charging pile is reduced, thereby further improving the test stability of the working performance of the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is an overall flow chart of the charging pile performance testing method according to an embodiment of the present invention;

[0038] Figure 2 This is an overall structural block diagram of the charging pile performance test system according to an embodiment of the present invention;

[0039] Figure 3 This is a logic flow chart of a charging pile performance testing method according to an embodiment of the present invention;

[0040] Figure 4 This is a specific flow chart of the process of determining the cutoff frequency of the filter in the charging pile in the charging pile performance testing method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0043] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0044] In addition, it should be noted that in the description of the present invention, 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 those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively an overall flow chart of the charging pile performance test method and system according to an embodiment of the present invention, an overall structure block diagram, a logic flow chart, and a specific flow chart of the process of determining the cutoff frequency of the filter in the charging pile. A charging pile performance test method according to the present invention comprises:

[0046] Step S1, using a voltage sensor to test the working performance of the charging pile, using an oscilloscope to detect the communication performance of the charging pile, and using a temperature sensor to detect the temperature inside the charging pile, wherein the working performance includes the working voltage of the charging pile, and the communication performance includes the transmission rate of the communication signal of the charging pile and the retransmission interval of the communication signal of the charging pile;

[0047] Step S2, obtaining the working voltage of the charging pile in several test cycles;

[0048] Step S3, determining the test stability of the working performance of the charging pile based on the variance of the fluctuation amplitude of the working voltage of the charging pile;

[0049] Step S4, if the test stability does not meet the requirements, the cutoff frequency of the filter in the charging pile is determined or the communication performance of the charging pile is determined based on the variance of the fluctuation amplitude of the working voltage of the charging pile and the average transmission rate of the communication signal of the charging pile;

[0050] Step S5, if the communication performance does not meet the requirements, determining the retransmission interval of the communication signal of the charging pile or determining the charging power of the charging pile based on the average transmission rate of the communication signal of the charging pile and the temperature rise rate inside the charging pile;

[0051] Step S6: retest the working performance of the charging pile based on the determined retransmission interval of the communication signal of the charging pile and the charging power until it is qualified.

[0052] Specifically, the oscilloscope may be a digital oscilloscope, an analog oscilloscope, or a mixed signal oscilloscope.

[0053] Specifically, the filter includes a high-pass filter, a low-pass filter, and a band-pass filter, and a preferred embodiment thereof is a high-pass filter.

[0054] In implementation, the method of the present invention determines the cutoff frequency of the filter in the charging pile according to the variance of the fluctuation amplitude of the working voltage of the charging pile. Due to the poor contact of the connector in the power line, the current transmission is not smooth, which causes the voltage to fluctuate. By increasing the cutoff frequency of the filter in the charging pile, the high-frequency signal entering the charging pile is filtered out, thereby reducing the voltage fluctuation. The retransmission interval of the communication signal of the charging pile is determined according to the average transmission rate of the communication signal of the charging pile. Since the position of the charging pile may be close to the transformer, the communication signal sent by the charging pile is interfered, which causes the transmission rate of the communication signal of the charging pile to change. By increasing the retransmission interval of the communication signal of the charging pile, the situation of retransmission conflict caused by interference is reduced. The charging power of the charging pile is determined according to the temperature increase rate inside the charging pile. Due to long-term use, dust and dirt accumulate at the heat dissipation port of the charging pile, resulting in blockage of some heat dissipation ports, which causes the internal temperature of the charging pile to increase during operation. By reducing the charging power of the charging pile, the heat generated inside the charging pile is reduced, and the test stability of the working performance of the charging pile is improved.

[0055] Specifically, the test stability of the working performance of the charging pile is determined, including:

[0056] Obtaining the working voltage of the charging pile during several test cycles, and comparing the variance of the fluctuation amplitude of the working voltage of the charging pile;

[0057] Comparing the variance of the fluctuation amplitude of the working voltage of the charging pile with a preset first variance;

[0058] If the variance of the fluctuation amplitude of the working voltage of the charging pile is greater than the preset first variance, it is determined that the test stability of the working performance of the charging pile does not meet the requirements.

[0059] Specifically, the communication performance of the charging pile is determined, including:

[0060] Comparing the variance of the fluctuation amplitude of the working voltage of the charging pile with the preset first variance and the preset second variance respectively;

[0061] If the variance of the fluctuation amplitude of the working voltage of the charging pile is greater than the preset first variance and less than or equal to the preset second variance, it is preliminarily determined that the communication performance of the charging pile does not meet the requirements, and whether the communication performance of the charging pile meets the requirements is determined based on the average transmission rate of the communication signal of the charging pile.

[0062] It can be understood that the three intervals corresponding to the preset first variance Q1 and the preset second variance Q2 correspond to three situations respectively. The first interval is Q≤Q1, corresponding to the situation where the test stability of the working performance of the charging pile meets the requirements; the second interval is Q1<Q≤Q2, corresponding to the situation where the location of the charging pile may be close to the transformer, causing the communication signal emitted by the charging pile to be interfered, thereby causing the transmission rate of the communication signal of the charging pile to change; the third interval is Q>Q2, corresponding to the situation where the connector in the power supply line has poor contact, resulting in poor current transmission, thereby causing voltage fluctuations. In practice, the range of Q1 is generally selected from [7V 2 , 9V 2 ], Q2 is generally selected in the range of [9V 2 , 11V 2 ].

[0063] Preferably, the preferred embodiment of the preset first variance Q1 is 8V 2 The preferred embodiment of the preset second variance Q2 is 10V 2 .

[0064] Specifically, the variance of the fluctuation amplitude of the working voltage of the charging pile is recorded as Q.

[0065] Specifically, the variance of the fluctuation amplitude of the working voltage of the charging pile is the variance of the fluctuation amplitude of the working voltage of the charging pile within several test cycles. The calculation method of the variance of the fluctuation amplitude of the working voltage of the charging pile is a conventional technical means well known to technical personnel in this field. Therefore, the calculation process of the variance of the fluctuation amplitude of the working voltage of the charging pile will not be repeated here.

[0066] Specifically, the calculation formula for the fluctuation amplitude of the working voltage of the charging pile is:

[0067]

[0068] Among them, S is the fluctuation amplitude of the working voltage of the charging pile, E1 is the maximum working voltage of the charging pile in a single cycle, and E2 is the minimum working voltage of the charging pile in a single cycle.

[0069] In implementation, the method of the present invention determines the test stability of the working performance of the charging pile by setting a preset first variance and a preset second variance, thereby reducing the impact of the decrease in the test accuracy of the charging pile performance due to inaccurate judgment of the test stability of the working performance of the charging pile, and further improving the test stability of the working performance of the charging pile.

[0070] Specifically, the cutoff frequency of the filter in the charging pile is determined, including:

[0071] Comparing the variance of the fluctuation amplitude of the working voltage of the charging pile with the preset second variance;

[0072] If the variance of the fluctuation amplitude of the working voltage of the charging pile is greater than the preset second variance, the cutoff frequency of the filter in the charging pile is increased.

[0073] Specifically, the increase range of the cut-off frequency of the filter in the charging pile is determined by the difference between the variance of the fluctuation amplitude of the working voltage of the charging pile and a preset second variance.

[0074] Specifically, the calculation formula for the cutoff frequency of the filter in the increased charging pile is:

[0075]

[0076] Among them, V' is the cutoff frequency of the filter in the charging pile after the increase, V is the cutoff frequency of the filter in the current charging pile, A is the minimum unit variance for adjusting the cutoff frequency of the filter in the charging pile, and v is the cutoff frequency of the filter in the charging pile when the variance of the fluctuation amplitude of the working voltage of the charging pile is the minimum unit variance.

[0077] In practice, the value of A is generally 11V. 2 ~13V 2 , preferably, the preferred embodiment of A is 12V 2 .

[0078] In implementation, the optional value range of v is [1700 Hz, 1900 Hz]. Preferably, when the cutoff frequency of the filter in the charging pile is less than 1800 Hz, voltage fluctuations may occur. Therefore, the preferred embodiment of v is 1800 Hz.

[0079] For example, the charging pile performance test method is used to test the charging pile for electric vehicles, where V=1700Hz, Q=16V 2 , we can calculate V'= =2600Hz.

[0080] In implementation, the method of the present invention determines the cutoff frequency of the filter in the charging pile by setting a preset first variance and a preset second variance. Due to poor contact of the connector in the power line, the current transmission is not smooth, which causes voltage fluctuations. By increasing the cutoff frequency of the filter in the charging pile, the high-frequency signal entering the charging pile is filtered out, thereby reducing voltage fluctuations and further improving the test stability of the working performance of the charging pile.

[0081] Specifically, the retransmission interval duration of the communication signal of the charging pile is determined, including:

[0082] Obtaining the transmission rate of the communication signal of the charging pile in several transmission cycles, and calculating the average transmission rate of the communication signal of the charging pile;

[0083] Comparing the average transmission rate of the communication signal of the charging pile with the preset first transmission rate and the preset second transmission rate respectively;

[0084] If the average transmission rate of the communication signal of the charging pile is greater than the preset first transmission rate, it is determined that the communication performance of the charging pile does not meet the requirements;

[0085] If the average transmission rate of the communication signal of the charging pile is greater than the preset first transmission rate and less than or equal to the preset second transmission rate, then increasing the retransmission interval of the communication signal of the charging pile;

[0086] If the average transmission rate of the communication signal of the charging pile is greater than the preset second transmission rate, it is preliminarily determined that the environmental stability of the charging pile does not meet the requirements, and whether the environmental stability of the charging pile meets the requirements is determined based on the temperature rise rate inside the charging pile.

[0087] It can be understood that the three intervals corresponding to the preset first transmission rate P1 and the preset second transmission rate P2 correspond to three situations respectively. The first interval is P≤P1, corresponding to the situation where the communication performance of the charging pile meets the requirements; the second interval is P1<P≤P2, corresponding to the situation where the location of the charging pile may be close to the transformer, causing the communication signal emitted by the charging pile to be interfered, thereby causing the transmission rate of the communication signal of the charging pile to change; the third interval is P>P2, corresponding to the situation where long-term use causes dust and dirt to accumulate at the heat dissipation port of the charging pile, resulting in blockage of some heat dissipation ports, thereby causing the internal temperature of the charging pile to rise during operation. In practice, the range of P1 is generally [250kbps, 350kbps], and the range of P2 is generally [350kbps, 450kbps].

[0088] Preferably, the preferred embodiment of the preset first transmission rate P1 is 300 kbps, and the preferred embodiment of the preset second transmission rate P2 is 400 kbps.

[0089] Specifically, kbps is the unit of the transmission rate of the communication signal of the charging pile, which means 1,000 bits per second.

[0090] Specifically, the average transmission rate of the communication signal of the charging pile is denoted as P.

[0091] Specifically, the calculation formula for the average transmission rate of the communication signal of the charging pile is:

[0092]

[0093] Where P is the average transmission rate of the communication signal of the charging pile, X a is the transmission rate of the communication signal of the charging pile in the ath transmission cycle, n is the number of transmission cycles, and n is a natural number greater than or equal to 1.

[0094] In implementation, the method of the present invention determines the communication performance of the charging pile by setting a preset first transmission rate and a preset second transmission rate, thereby reducing the impact of the inaccurate judgment of the communication performance of the charging pile on the test stability of the charging pile's working performance, and further improving the test stability of the charging pile's working performance.

[0095] Specifically, the increase range of the retransmission interval duration of the communication signal of the charging pile is determined by the difference between the average transmission rate of the communication signal of the charging pile and the preset first transmission rate.

[0096] Specifically, the calculation formula for the increased retransmission interval of the communication signal of the charging pile is:

[0097]

[0098] Among them, H' is the increased retransmission interval duration of the communication signal of the charging pile, H is the current retransmission interval duration of the communication signal of the charging pile, B is the minimum unit transmission rate for adjusting the retransmission interval duration of the communication signal of the charging pile, and h is the retransmission interval duration of the communication signal of the charging pile when the average transmission rate of the communication signal of the charging pile is the minimum unit transmission rate.

[0099] In practice, the value of B is generally 450 kbps to 550 kbps. Preferably, the preferred embodiment of B is 500 kbps.

[0100] In implementation, the optional value range of h is [350ms, 450ms]. Preferably, when the retransmission interval of the communication signal of the charging pile is less than 400ms, the communication signal may be interfered with. Therefore, the preferred embodiment of h is 400ms.

[0101] Specifically, ms is the unit of the retransmission interval of the communication signal of the charging pile, which means milliseconds.

[0102] For example, the charging pile performance test method is used to test the charging pile for electric vehicles, where H = 350ms, P = 500kbps, and H' = =510ms.

[0103] In implementation, the method of the present invention determines the retransmission interval duration of the communication signal of the charging pile by setting a preset first transmission rate and a preset second transmission rate. Since the location of the charging pile may be close to the transformer, the communication signal emitted by the charging pile is interfered, thereby causing the transmission rate of the communication signal of the charging pile to change. By increasing the retransmission interval duration of the communication signal of the charging pile, the situation of retransmission conflicts due to interference is reduced, thereby further improving the test stability of the working performance of the charging pile.

[0104] Specifically, the charging power of the charging pile is determined, including:

[0105] Obtain the temperature inside the charging pile in a single cycle and calculate the temperature increase rate inside the charging pile;

[0106] Comparing the temperature increase rate inside the charging pile with a preset temperature increase rate;

[0107] If the temperature increase rate inside the charging pile is greater than the preset increase rate, it is determined that the environmental stability of the charging pile does not meet the requirements, and the charging power of the charging pile is reduced.

[0108] It can be understood that the two intervals corresponding to the preset increase rate Y0 correspond to two situations. The first interval is Y≤Y0, which corresponds to the situation where the environmental stability of the charging pile meets the requirements. The second interval is Y>Y0, which corresponds to the situation where long-term use causes dust and dirt to accumulate at the heat dissipation port of the charging pile, resulting in blockage of some heat dissipation ports, thereby causing the internal temperature of the charging pile to rise during operation. In practice, the range of Y0 is generally [0.4℃ / h, 0.6℃ / h].

[0109] Preferably, the preset increase rate Y0 is 0.5° C. / h.

[0110] Specifically, the temperature rise rate inside the charging pile is recorded as Y.

[0111] Specifically, the calculation formula for the temperature rise rate inside the charging pile is:

[0112]

[0113] Among them, Y is the temperature rise rate inside the charging pile, K1 is the temperature inside the charging pile at the end of a single cycle, K2 is the temperature inside the charging pile at the initial moment of a single cycle, and T is the duration of a single cycle.

[0114] In implementation, the method of the present invention determines the environmental stability of the charging pile by setting a preset increase rate, thereby reducing the impact of the decreased test stability of the charging pile's working performance due to inaccurate judgment of the environmental stability of the charging pile, and further improving the test stability of the charging pile's working performance.

[0115] Specifically, the reduction range of the charging power of the charging pile is determined by the difference between the temperature increase rate inside the charging pile and a preset temperature increase rate.

[0116] Specifically, the calculation formula for the reduced charging power of the charging pile is:

[0117]

[0118] Among them, L' is the charging power of the charging pile after reduction, L is the current charging power of the charging pile, C is the minimum unit increase rate for adjusting the charging power of the charging pile, and l is the charging power of the charging pile when the temperature increase rate inside the charging pile is the minimum unit increase rate.

[0119] In practice, the value of C is generally 0.5°C / h to 0.7°C / h. Preferably, the preferred embodiment of C is 0.6°C / h.

[0120] In implementation, the optional range of l is [14KW, 16KW]. Preferably, when the charging power of the charging pile is greater than 15KW, it may cause the internal temperature of the charging pile to rise. Therefore, the preferred embodiment of l is 15KW.

[0121] For example, the charging pile performance test method is used to test the charging pile for electric vehicles, where L = 16KW, Y = 0.8℃ / h, and L' = =8.5KW.

[0122] In implementation, the method of the present invention determines the charging power of the charging pile by setting a preset increase rate. Due to long-term use, dust and dirt accumulate at the heat dissipation ports of the charging pile, causing some heat dissipation ports to be blocked, thereby causing the internal temperature of the charging pile to increase during operation. By reducing the charging power of the charging pile, the heat generated inside the charging pile is reduced, thereby further improving the test stability of the working performance of the charging pile.

[0123] A charging pile performance test system, comprising:

[0124] A test connection module, used to connect to a charging pile for testing, including a filter arranged inside the charging pile for filtering high-frequency signals of an input power supply of the charging pile and a signal transmitter arranged inside the charging pile for transmitting a communication signal;

[0125] A test module, which is connected to the test connection module, and includes a voltage sensor arranged inside the charging pile housing to detect the working voltage of the charging pile, an oscilloscope connected to the signal transmitter to detect the transmission rate of the communication signal, and a temperature sensor arranged inside the charging pile housing to detect the temperature inside the charging pile;

[0126] A control module, which is connected to the test connection module and the test module respectively, and is used to determine whether the test stability of the working performance of the charging pile meets the requirements according to the variance of the fluctuation amplitude of the working voltage of the charging pile, and when it does not meet the requirements, determine the cutoff frequency of the filter in the charging pile or determine the retransmission interval of the communication signal of the charging pile according to the average transmission rate of the communication signal of the charging pile, and determine the charging power of the charging pile according to the average transmission rate of the communication signal of the charging pile and the temperature rise rate inside the charging pile.

[0127] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A charging pile performance testing method, characterized in that: include: Use a voltage sensor to test the working performance of the charging pile, use an oscilloscope to detect the communication performance of the charging pile, and use a temperature sensor to detect the temperature inside the charging pile, wherein the working performance includes the working voltage of the charging pile, and the communication performance includes the transmission rate of the communication signal of the charging pile and the retransmission interval of the communication signal of the charging pile; Obtain the working voltage of the charging pile during several test cycles; The test stability of the working performance of the charging pile is determined based on the variance of the fluctuation amplitude of the working voltage of the charging pile; If the test stability does not meet the requirements, the cutoff frequency of the filter in the charging pile is determined or the communication performance of the charging pile is determined based on the variance of the fluctuation amplitude of the working voltage of the charging pile and the average transmission rate of the communication signal of the charging pile; If the communication performance does not meet the requirements, the retransmission interval of the communication signal of the charging pile is determined, or the charging power of the charging pile is determined based on the average transmission rate of the communication signal of the charging pile and the temperature rise rate inside the charging pile; Based on the determined retransmission interval of the communication signal of the charging pile and the charging power, the working performance of the charging pile is retested until it is qualified; Determine the test stability of the working performance of the charging pile, including: Obtaining the working voltage of the charging pile during several test cycles, and comparing the variance of the fluctuation amplitude of the working voltage of the charging pile; Comparing the variance of the fluctuation amplitude of the working voltage of the charging pile with a preset first variance; If the variance of the fluctuation amplitude of the working voltage of the charging pile is greater than the preset first variance, it is determined that the test stability of the working performance of the charging pile does not meet the requirements; Determine the communication performance of the charging pile, including: Comparing the variance of the fluctuation amplitude of the working voltage of the charging pile with the preset first variance and the preset second variance respectively; If the variance of the fluctuation amplitude of the working voltage of the charging pile is greater than the preset first variance and less than or equal to the preset second variance, it is preliminarily determined that the communication performance of the charging pile does not meet the requirements, and whether the communication performance of the charging pile meets the requirements is determined based on the average transmission rate of the communication signal of the charging pile; Determine the retransmission interval of the communication signal of the charging pile, including: Obtaining the transmission rate of the communication signal of the charging pile in several transmission cycles, and calculating the average transmission rate of the communication signal of the charging pile; Comparing the average transmission rate of the communication signal of the charging pile with the preset first transmission rate and the preset second transmission rate respectively; If the average transmission rate of the communication signal of the charging pile is greater than the preset first transmission rate, it is determined that the communication performance of the charging pile does not meet the requirements; If the average transmission rate of the communication signal of the charging pile is greater than the preset first transmission rate and less than or equal to the preset second transmission rate, then increasing the retransmission interval of the communication signal of the charging pile; If the average transmission rate of the communication signal of the charging pile is greater than the preset second transmission rate, it is preliminarily determined that the environmental stability of the charging pile does not meet the requirements, and whether the environmental stability of the charging pile meets the requirements is determined based on the temperature rise rate inside the charging pile.

2. The charging pile performance testing method according to claim 1, characterized in that: Determine the cutoff frequency of the filter in the charging pile, including: Comparing the variance of the fluctuation amplitude of the working voltage of the charging pile with the preset second variance; If the variance of the fluctuation amplitude of the working voltage of the charging pile is greater than the preset second variance, the cutoff frequency of the filter in the charging pile is increased.

3. The charging pile performance testing method according to claim 2, characterized in that: The increase range of the cut-off frequency of the filter in the charging pile is determined by the difference between the variance of the fluctuation amplitude of the working voltage of the charging pile and a preset second variance.

4. The charging pile performance testing method according to claim 3, characterized in that: The increase range of the retransmission interval duration of the communication signal of the charging pile is determined by the difference between the average transmission rate of the communication signal of the charging pile and the preset first transmission rate.

5. The charging pile performance testing method according to claim 4, characterized in that: Determine the charging power of the charging pile, including: Obtain the temperature inside the charging pile in a single cycle and calculate the temperature increase rate inside the charging pile; Comparing the temperature increase rate inside the charging pile with a preset temperature increase rate; If the temperature increase rate inside the charging pile is greater than the preset increase rate, it is determined that the environmental stability of the charging pile does not meet the requirements, and the charging power of the charging pile is reduced.

6. The charging pile performance testing method according to claim 5, characterized in that: The reduction range of the charging power of the charging pile is determined by the difference between the temperature increase rate inside the charging pile and a preset increase rate.

7. A charging pile performance testing system using the charging pile performance testing method according to any one of claims 1 to 6, characterized in that: include: A test connection module, used to connect to a charging pile for testing, including a filter arranged inside the charging pile for filtering high-frequency signals of an input power supply of the charging pile and a signal transmitter arranged inside the charging pile for transmitting a communication signal; a test module connected to the test connection module, comprising a voltage sensor disposed inside the charging pile for detecting the working voltage of the charging pile, an oscilloscope connected to the signal transmitter for detecting the transmission rate of the communication signal, and a temperature sensor disposed inside the charging pile for detecting the temperature inside the charging pile; A control module, which is connected to the test connection module and the test module respectively, and is used to determine whether the test stability of the working performance of the charging pile meets the requirements according to the variance of the fluctuation amplitude of the working voltage of the charging pile, and when it does not meet the requirements, determine the cutoff frequency of the filter in the charging pile or determine the retransmission interval of the communication signal of the charging pile according to the average transmission rate of the communication signal of the charging pile, and determine the charging power of the charging pile according to the average transmission rate of the communication signal of the charging pile and the temperature rise rate inside the charging pile.

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