Charging signal simulation method, charging test equipment and charging test system

Abstract

The invention provides a charging signal simulation method, charging test equipment and a charging test system, and belongs to the technical field of automobile charging test. Wherein the charging control module obtains a charging connection signal sent by the electric vehicle, and controls the alternating current guide module to send a target pulse width modulation signal to the electric vehicle; the charging control module sends test parameter information to the abnormal waveform simulation module according to a preset test case, and controls the AC-AC conversion module to send an AC electric signal indicated by the test case to the abnormal waveform simulation module; the abnormal waveform simulation module injects an interference signal into the alternating current signal based on the test parameter information, generates a target alternating current signal and sends the target alternating current signal to the electric vehicle through the switch module; the charging control module generates a charging test result according to the charging connection signal, the target pulse width modulation signal and the alternating current signal. According to the invention, the effects of dynamically simulating the disturbed abnormal power supply signal and improving the reliability of the charging test result of the electric vehicle can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of automobile charging test, and in particular to a charging signal simulation method, a charging test device and a charging test system. Background Art

[0002] In the field of power systems and automation, AC charging technology is widely used in various fields as a common charging method, such as public transportation, supermarkets, etc. Among them, charging piles, as an important AC power source, can provide AC power for electric vehicles and other public transportation vehicles. The charging performance of electric vehicles will seriously affect the production and application of electric vehicles. Therefore, a charging test system is urgently needed to test the AC charging performance of the car.

[0003] In the related technology, a national standard test module is integrated into the electric vehicle AC charging and discharging simulation control system. The national standard test module can provide a charging guidance signal during the electric vehicle AC charging process to simulate the abnormal situation of the charging guidance circuit and realize the simulation test of the electric vehicle charging and discharging.

[0004] However, when conducting AC charging tests on electric vehicles based on relevant technologies, there is a problem that only simulation tests on abnormal conditions of the charging guidance circuit during AC charging of electric vehicles are supported, and harmonic interference signals cannot be dynamically introduced to simulate abnormal power supplies. Therefore, the reliability of the AC charging test results of electric vehicles is poor. Summary of the invention

[0005] The purpose of the present application is to provide a charging signal simulation method, a charging test device and a charging test system, which can dynamically simulate the interfered abnormal power supply signal and improve the reliability of the electric vehicle charging test results.

[0006] The embodiment of the present application is implemented as follows:

[0007] In a first aspect of an embodiment of the present application, a charging signal simulation method is provided. The method is applied to a charging test device. The charging test device includes: a charging control module, an AC-AC conversion module, an abnormal waveform simulation module, a signal acquisition module, a switch module, and an AC guide module. The charging signal simulation method includes:

[0008] The charging control module obtains the charging connection signal sent by the electric vehicle, and controls the AC guidance module to send a target pulse width modulation signal to the electric vehicle;

[0009] The charging control module sends test parameter information to the abnormal waveform simulation module according to a pre-set test case, and controls the AC-AC conversion module to send an AC signal indicated by the test case to the abnormal waveform simulation module;

[0010] The abnormal waveform simulation module injects interference signals into the AC signal based on the test parameter information, generates a target AC signal, and sends it to the electric vehicle via the switch module;

[0011] The charging control module generates a charging test result of the electric vehicle according to the charging connection signal, the target pulse width modulation signal and the alternating current signal sent by the signal acquisition module.

[0012] As a possible implementation, the abnormal waveform simulation module includes: an abnormal waveform injection unit, the abnormal waveform simulation module injects an interference signal into the AC signal based on the test parameter information to generate a target AC signal, including:

[0013] The charging control module sends test parameter information to the abnormal waveform injection unit according to the pre-set test case items. The abnormal waveform injection unit injects an interference signal into the AC signal according to the test parameter information to obtain a target AC signal. The test parameter information includes: test waveform parameters.

[0014] As a possible implementation, the abnormal waveform simulation module further includes: an abnormal waveform acquisition unit, and an abnormal waveform injection unit injects an interference signal into the AC signal according to the test parameter information to obtain a target AC signal, and then includes:

[0015] The abnormal waveform acquisition unit acquires the target AC power signal output by the abnormal waveform injection unit in real time, calculates the harmonic content contained in the target AC power signal, and sends the calculated harmonic content to the charging control module;

[0016] The charging control module determines whether the abnormal waveform injection unit has an abnormal waveform injection fault based on a pre-set test case and the harmonic content contained in the target AC power signal.

[0017] As a possible implementation, the abnormal waveform injection unit includes: an AC harmonic injection unit, the abnormal waveform injection unit injects an interference signal into the AC signal according to the test parameter information to obtain a target AC signal, including:

[0018] The charging control module sends test parameter information to the AC harmonic injection unit according to the pre-set test case items. The AC harmonic injection unit injects an interference signal into the AC signal according to the test parameter information to obtain a target AC signal. The test parameter information includes: test harmonic parameters.

[0019] As a possible implementation, the abnormal waveform acquisition unit includes: a harmonic acquisition unit, and an AC harmonic injection unit injects an interference signal into an AC signal according to test parameter information to obtain a target AC signal, and then includes:

[0020] The harmonic collection unit collects the target AC power signal output by the AC harmonic injection unit in real time, calculates the harmonic content contained in the target AC power signal, and sends the calculated harmonic content to the charging control module;

[0021] The charging control module determines whether there is an AC harmonic injection fault in the AC harmonic injection unit based on a pre-set test case and the harmonic content contained in the received target AC power signal.

[0022] As a possible implementation manner, the charging control module controls the AC-AC conversion module to send an AC signal indicated by the test case to the abnormal waveform simulation module, including:

[0023] The AC-AC conversion module is used to convert the AC power signal provided by the AC distribution cabinet under the control of the charging control module to obtain the AC power signal indicated by the test case and send it to the abnormal waveform simulation module.

[0024] As a possible implementation, the charging control module includes: a test case editor, and the charging signal simulation method further includes:

[0025] The charging control module sets the test cases through the test case editor. The test cases include: AC power signal and test harmonic parameters. The test harmonic parameters include: interference harmonic number, interference harmonic content and interference harmonic duration.

[0026] As a possible implementation, the signal acquisition module further includes: an oscilloscope, and the charging signal simulation method further includes:

[0027] The signal acquisition module collects the charging connection signal, the target pulse width modulation signal and the actual input AC power signal of the electric vehicle in real time, and displays the waveform of the charging connection signal, the waveform of the target pulse width modulation signal and the waveform of the actual input AC power signal through the oscilloscope in the signal acquisition module.

[0028] According to a second aspect of an embodiment of the present application, a charging test device is provided, the charging test device comprising: a charging control module, an AC-AC conversion module, an abnormal waveform simulation module, a switch module, and an AC guidance module, wherein an output end of the abnormal waveform simulation module is connected to an input end of the switch module, an output end of the switch module is externally connected to an electric vehicle, a first input end of a signal acquisition module is connected to a charging port of the electric vehicle, and a second input end of the signal acquisition module is connected to an output end of the AC guidance module;

[0029] The charging control module is used to implement the steps of the charging signal simulation method described in the first aspect above.

[0030] According to a third aspect of an embodiment of the present application, a charging test system is provided, which includes: a control module and a communication module, the communication module is connected to an external device, and the control module is used to implement the steps of the charging signal simulation method described in the first aspect above.

[0031] The beneficial effects of the embodiments of the present application include:

[0032] The embodiment of the present application provides a charging signal simulation method, which controls an AC guide module to send a charging connection signal to an electric vehicle through a charging control module, and after receiving a charging confirmation signal fed back by the electric vehicle, controls a switch module to be turned on to establish a charging connection between the electric vehicle and a charging test device, and controls the AC guide module to send a target pulse width modulation signal to the electric vehicle to simulate the charging demand of the electric vehicle; the charging control module controls an AC-AC conversion module to convert the AC power provided by the AC power grid into an AC power signal indicated by the test case according to a preset test case, and at the same time, the charging control module sends test parameter information to an abnormal waveform simulation module according to a preset test case, and the abnormal waveform simulation module injects an interference signal into the AC power signal provided by the AC-AC conversion module according to the received test parameter information to generate a target AC power signal, and provides it to the electric vehicle via the switch module; the charging control module controls a signal acquisition module to collect the charging connection signal and the target pulse width modulation signal output by the AC guide module in real time, and at the same time, the signal acquisition module also collects the actual input AC power signal of the charging port of the electric vehicle in real time, and the charging control module determines the charging test result of the electric vehicle according to the fluctuation of the charging connection signal, the waveform of the target pulse width modulation signal and the waveform of the actual input AC power signal of the electric vehicle. In this way, the effect of dynamically simulating the disturbed abnormal power supply signal and improving the reliability of the electric vehicle charging test results can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A flowchart of a first charging signal simulation method provided in an embodiment of the present application;

[0035] Figure 2 A flowchart of a second charging signal simulation method provided in an embodiment of the present application;

[0036] Figure 3A flowchart of a third charging signal simulation method provided in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of the structure of a first charging test device provided in an embodiment of the present application;

[0038] Figure 5 A schematic diagram of the structure of a second charging test device provided in an embodiment of the present application;

[0039] Figure 6 A schematic diagram of the structure of a third charging test device provided in an embodiment of the present application;

[0040] Figure 7 A schematic diagram of the structure of a charging control module in a charging test device provided in an embodiment of the present application;

[0041] Figure 8 A schematic diagram of the structure of a switch module in a charging test device provided in an embodiment of the present application;

[0042] Fig. 9 A schematic diagram of the structure of a signal acquisition module in a charging test device provided in an embodiment of the present application;

[0043] Fig.10 A flowchart of a charging test device provided in an embodiment of the present application;

[0044] Fig.11 A method flow chart of a charging test device provided in an embodiment of the present application;

[0045] Fig.12 A schematic diagram of the structure of a charging test system provided in an embodiment of the present application.

[0046] Description of the drawings: 10: Charging test equipment; 101: Charging control module; 1011: Test case editor; 102: AC-AC conversion module; 103: Abnormal waveform simulation module; 1031: Abnormal waveform injection unit; 311: AC harmonic injection unit; 1032: Abnormal waveform acquisition unit; 321: Harmonic acquisition unit; 104: Signal acquisition module; 1041: Oscilloscope; 105: Switch module; 1051: First contactor; 1052: Second contactor; 1053: Third contactor; 1054: Fourth contactor; 106: AC guidance module; 20: Charging test system; 201: Communication module; 202: Control module. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0049] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0050] In the description of the present application, it should be noted that the terms "first", "second", "third", "fourth", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. It should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "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, and it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] At present, the national standard test module is often integrated into the AC charging and discharging simulation control system of electric vehicles. The national standard test module provides charging guidance signals for the AC charging process of electric vehicles, and simulates the abnormal state of the charging guidance circuit through the national standard test module to realize the charging and discharging simulation test of electric vehicles. However, this solution can only simulate the fault of the guidance circuit during the AC charging process of electric vehicles, and cannot dynamically simulate the abnormal power supply signal interfered by harmonics, which results in the problem of poor reliability of the AC charging test results of electric vehicles.

[0052] To this end, the embodiment of the present application provides a charging signal simulation method, wherein the charging control module controls the AC guide module to send a charging connection signal to the electric vehicle, and after receiving the charging confirmation signal fed back by the electric vehicle, controls the switch module to be turned on, and controls the AC guide module to provide the target pulse width modulation signal required for the AC charging process for the electric vehicle; the charging control module sends test parameter information to the abnormal waveform simulation module based on a pre-set test case, and controls the AC-AC conversion module to convert the AC input of the AC distribution cabinet to obtain the AC signal indicated by the test case and input it into the abnormal waveform simulation module; the abnormal waveform simulation module injects an interference signal into the received AC signal according to the received test harmonic parameter to obtain the target AC signal and transmit it to the charging port of the electric vehicle via the switch module; the charging control module generates the charging test result of the electric vehicle according to the actual input AC signal of the charging port of the electric vehicle obtained by the signal acquisition module, the charging connection signal output by the AC guide module, and the target pulse width modulation signal. In this way, the effect of dynamically simulating the abnormal power supply signal subjected to interference and improving the reliability of the charging test result of the electric vehicle can be achieved.

[0053] The charging signal simulation method and the charging device provided in the embodiments of the present application are explained in detail below with reference to the accompanying drawings.

[0054] It is worth noting that the charging signal simulation method provided in the embodiment of the present application can be applied to both DC charging tests and AC charging tests of electric vehicles. The present application applies the charging signal simulation method to the AC charging test process of electric vehicles, but it does not mean that the charging signal simulation method provided in the embodiment of the present application is only applicable to the AC charging test process of electric vehicles. The present application does not make specific limitations on this.

[0055] Figure 1 This is a flow chart of a charging signal simulation method provided in the present application. The charging signal simulation method provided in the embodiment of the present application is applied to Figure 4 On the charging control module 101 of the charging test device 10 shown in FIG. Figure 4 The charging test device 10 provided in the embodiment of the present application includes: a charging control module 101, an AC-AC conversion module 102, an abnormal waveform simulation module 103, a signal acquisition module 104, a switch module 105 and an AC guidance module 106. Among them, the output end of the abnormal waveform simulation module 103 is connected to the input end of the switch module 105, the output end of the switch module 105 is externally connected to the electric vehicle, the first input end of the signal acquisition module 104 is connected to the charging port of the electric vehicle, and the second input end of the signal acquisition module 104 is connected to the output end of the AC guidance module 106.

[0056] Optionally, the charging control module 101 is used to control the charging test process of the charging test device 10, and the charging control module 101 can be implemented by a controller. Among them, the charging control module 101 can control the AC-AC conversion module 102 to convert the AC power input by the AC power grid so that the AC power flowing through the charging test device 10 is pure controllable AC power. The AC-AC conversion module 102 can be implemented by an AC-AC converter; the charging control module 101 can also control the abnormal waveform simulation module 103 to inject harmonic interference signals into the controllable AC power provided by the AC-AC conversion module 102; the charging control module 101 can also control the signal acquisition module 104 to collect the AC power interfered by the harmonics output by the AC harmonic injection unit 311 and the AC guidance signal output by the AC guidance module 106. Block 104 can be implemented by an acquisition circuit; the charging control module 101 can also control the on and off of the switch module 105 to control the start and stop of the charging test between the charging test equipment 10 and the electric vehicle, and the switch module 105 can be implemented by multiple contactors; the charging control module 101 can also control the AC guidance module 106 to provide an AC guidance signal to the electric vehicle, and the AC guidance module 106 can be implemented by an AC guidance circuit. This application does not specifically limit the specific implementation methods of the above charging control module 101, AC-AC conversion module 102, abnormal waveform simulation module 103, signal acquisition module 104, switch module 105 and AC guidance module 106.

[0057] Optionally, the charging control module 101 controls the AC-AC conversion module 102 to provide controllable AC power to the abnormal waveform simulation module 103, and controls the abnormal waveform simulation module 103 to inject interference signals into the controllable AC power. Under the premise that the abnormal waveform simulation module 103 operates normally, the abnormal waveform simulation module 103 sends AC power interfered by the abnormal waveform to the electric vehicle via the switch module 105. In addition, the charging control module 101 also controls the signal acquisition module 104 to obtain the AC power interfered by the harmonics output by the abnormal waveform simulation module 103 via the switch module 105 in real time through the first input terminal, and at the same time, the signal acquisition module 104 obtains the AC guidance signal output by the AC guidance module 106 in real time through the second input terminal.

[0058] In an optional embodiment, see Figure 1 The charging signal simulation method provided in the embodiment of the present application is applied to Figure 4 On the charging control module 101 in the charging test device 10 shown, the charging signal simulation method provided by the embodiment of the present application includes:

[0059] S101. The charging control module obtains a charging connection signal sent by the electric vehicle, and controls the AC guidance module to send a target pulse width modulation signal to the electric vehicle.

[0060] Optionally, the charging control module 101 controls the AC guidance module 106 to send a charging connection signal to the electric vehicle. The AC guidance module 106 can be implemented by a charging guidance circuit. The AC guidance module 106 is used to simulate the charging guidance signal of the charging guidance circuit under the control of the charging control module 101. The charging confirmation signal can be represented by a CC signal. The charging confirmation signal is used to characterize the CC signal sent by the charging test device 10 to the electric vehicle. The charging confirmation signal is used to inform the electric vehicle of the charging method supported by the charging test device 10 and the system charging capability. The CC signal is determined by the output voltage of the charging test device 10. It is worth noting that the charging connection signal can also be identified as a charging test request sent by the charging test device 10 to the electric vehicle. The charging connection signal is specifically determined by the voltage of the charging connection signal.

[0061] It is worth noting that the charging test device 10 is connected to the charging port of the electric vehicle via a charging gun. The charging test device 10 can provide AC power to the electric vehicle via the charging gun and send an AC guide signal to the electric vehicle through the charging gun.

[0062] Optionally, after receiving the charging connection signal sent by the AC guidance module 106, the electric vehicle can feedback a charging confirmation signal to the charging test device 10, and the charging confirmation signal is used to indicate that the electric vehicle accepts the charging test request of the charging test device 10. After receiving the charging confirmation signal from the electric vehicle, the charging control module 101 controls the switch module 105 to turn on to start the AC charging test process of the electric vehicle.

[0063] Optionally, after the charging test equipment 10 establishes a charging connection with the electric vehicle, the charging control module 101 controls the AC guide module 106 to send a target pulse width modulation signal to the electric vehicle via the charging gun. The target pulse width modulation signal can be represented by a target PWM signal. The target pulse width modulation signal is used to indicate the target charging capacity supported by the electric vehicle. The charging control module 101 adjusts the target charging capacity supported by the electric vehicle by setting the frequency and duty cycle of the target pulse width modulation signal.

[0064] S102 . The charging control module sends test parameter information to the abnormal waveform simulation module according to a preset test case, and controls the AC-AC conversion module to send an AC signal indicated by the test case to the abnormal waveform simulation module.

[0065] Optionally, the pre-set test case is an AC charging test parameter set in advance by the user and stored in the charging control module. The pre-set test case includes not only the test parameter information, but also the AC signal required for the AC charging test. Among them, the test parameter information is used to indicate the parameters of the abnormal waveform injected into the AC signal by the abnormal waveform simulation module 103. The AC signal is a controllable AC signal provided by the AC-AC conversion module 102 indicated by the charging control module 101. The user can edit the test parameters corresponding to the AC signal in the test case in the charging control module 101. It is worth noting that the test parameter information includes information such as the waveform, frequency, amplitude, etc. of the injected abnormal waveform.

[0066] S103, the abnormal waveform simulation module injects an interference signal into the AC signal based on the test parameter information, generates a target AC signal and sends it to the electric vehicle via the switch module.

[0067] Optionally, the abnormal waveform simulation module 103 injects an interference signal into the AC signal provided by the AC-AC conversion module 102 according to the test parameter information sent by the charging control module 101, and the interference signal is used to indicate a signal that interferes with the voltage waveform and current waveform of the AC, and the harmonic amount contained in the AC output by the abnormal waveform simulation module 103 is the same as the harmonic amount represented by the test parameter information set in the charging control module 101. The interference order of the interference signal ranges from 2 to 50.

[0068] Optionally, the abnormal waveform simulation module 103 injects an interference signal into the AC signal according to the test parameter information to generate a target AC signal, and the target AC signal is used to indicate an AC signal with abnormal waveform interference corresponding to the test parameter information indicated by the test case. The target AC output by the abnormal waveform simulation module 103 is transmitted to the electric vehicle via the switch module 105.

[0069] S104: The charging control module generates a charging test result of the electric vehicle according to the charging connection signal, the target pulse width modulation signal and the alternating current signal sent by the signal acquisition module.

[0070] Optionally, the AC signal is used to indicate the AC power actually consumed during the actual charging process of the electric vehicle, and the charging control module 101 generates a charging test result of the electric vehicle according to the fluctuation of the charging connection signal collected by the signal acquisition module 104, the target charging capacity indicated by the target pulse width modulation signal, and the actual charging capacity of the electric vehicle. The charging test result is used to indicate the quality of the charging test performance of the electric vehicle.

[0071] In an embodiment of the present application, the charging control module controls the AC guide module to send a charging connection signal to the electric vehicle, and after receiving the charging confirmation signal fed back by the electric vehicle, controls the switch module to be turned on to establish a charging connection between the electric vehicle and the charging test equipment, and controls the AC guide module to send a target pulse width modulation signal to the electric vehicle to simulate the charging demand of the electric vehicle; the charging control module controls the AC-AC conversion module to convert the AC power provided by the AC power grid into an AC power signal indicated by the test case according to a preset test case, and at the same time, the charging control module sends test parameter information to the abnormal waveform simulation module according to the preset test case, and the AC harmonic injection module injects an interference signal into the AC power signal provided by the AC-AC conversion module according to the received test parameter information to generate a target AC power signal, and provides it to the electric vehicle via the switch module; the charging control module controls the signal acquisition module to collect the charging connection signal and the target pulse width modulation signal output by the AC guide module in real time, and at the same time, the signal acquisition module also collects the actual input AC power signal of the charging port of the electric vehicle in real time, and the charging control module determines the charging test result of the electric vehicle according to the fluctuation of the charging connection signal, the waveform of the target pulse width modulation signal and the waveform of the actual input AC power signal of the electric vehicle. In this way, the effect of dynamically simulating the disturbed abnormal power supply signal and improving the reliability of the electric vehicle charging test results can be achieved.

[0072] In an optional embodiment, see Figure 5 The abnormal waveform simulation module 103 in the charging test device 10 provided in the embodiment of the present application includes: an abnormal waveform injection unit 1031 and an abnormal waveform acquisition unit 1032 .

[0073] Optionally, the abnormal waveform injection unit 1031 is used to simulate the waveform under the power supply abnormality, and the abnormal waveform acquisition unit 1032 is used to acquire the AC signal output by the AC-AC conversion module 102 under the influence of the abnormal waveform injected by the abnormal waveform injection unit 1031. The power supply abnormal waveform can be a power supply abnormal waveform such as a voltage drop waveform, a voltage breakthrough waveform, a voltage drop waveform, etc.

[0074] The abnormal waveform injection unit 1031 is connected to the AC-AC conversion module 102 and is also connected in communication with the charging control module 101 . In addition, the abnormal waveform collection unit 1032 and the abnormal waveform injection unit 1031 are both connected in communication with the charging control module 101 .

[0075] In an optional implementation manner, the above step S103 may specifically be:

[0076] The abnormal waveform injection unit 1031 injects an interference signal into the AC signal according to the test parameter information to obtain a target AC signal. The test parameter information includes: a test waveform parameter.

[0077] Optionally, the abnormal waveform injection unit 1031 is used to simulate the abnormal waveform indicated by the test parameter information sent by the charging control module 101 , and the abnormal waveform injection unit 1031 injects the simulated power supply abnormal waveform into the AC signal converted by the AC-AC conversion module 102 .

[0078] For an alternative implementation, see Figure 2 , after the abnormal waveform injection unit injects an interference signal into the AC signal according to the test parameter information to obtain the target AC signal, it includes:

[0079] S201. The abnormal waveform acquisition unit acquires the target AC power signal output by the abnormal waveform injection unit in real time, calculates the harmonic content contained in the target AC power signal, and sends the calculated harmonic content to the charging control module.

[0080] Optionally, the abnormal waveform acquisition unit 1032 acquires in real time the AC signal after the abnormal waveform injection unit 1031 simulates the abnormal waveform interference of the power supply. The abnormal waveform acquisition unit 1032 calculates the harmonic content contained in the target AC signal based on the power characteristics such as the frequency, waveform, and amplitude of the voltage waveform and the current waveform in the AC signal output by the abnormal waveform injection unit 1031, and feeds back the calculated result to the charging control module 101.

[0081] S202: The charging control module determines whether the abnormal waveform injection unit has an abnormal waveform injection fault based on a preset test case and the harmonic content contained in the target AC power signal.

[0082] Optionally, the charging control module 101 determines whether the abnormal waveform injection unit 1031 has an abnormal waveform injection fault based on a comparison result of the harmonic content of the abnormal waveform in the target AC power signal actually output by the abnormal waveform injection unit 1031 and the harmonic content of the abnormal waveform set in the test case.

[0083] Optionally, if the harmonic content of the abnormal waveform in the target AC power signal actually output by the abnormal waveform injection unit 1031 is different from the harmonic content of the abnormal waveform set in the test case, the abnormal waveform injection unit 1031 has an abnormal waveform injection fault, and the charging control module 101 suspends the charging test process of the electric vehicle; if the harmonic content of the abnormal waveform in the target AC power signal actually output by the abnormal waveform injection unit 1031 is the same as the harmonic content of the abnormal waveform set in the test case, the abnormal waveform injection unit 1031 does not have an abnormal waveform injection fault, and the charging test device 10 continues to test the charging performance of the electric vehicle.

[0084] In an optional implementation, the AC guidance module 106 includes: a CC signal generating circuit and a CP signal generating circuit. The charging control module 101 controls the CC signal generating circuit to send a charging connection signal, i.e., a CC signal, to the electric vehicle; the charging control module 101 controls the CP signal generating circuit to provide a target pulse width modulation signal and a CP signal to the electric vehicle.

[0085] Optionally, the charging control module 101 first controls the CC signal generating circuit to send a charging connection signal to the electric vehicle, that is, before the charging pile charges the electric vehicle, it needs to send a CC signal to the electric vehicle to inform the electric vehicle of the charging capacity and charging method of the charging pile; the charging control module 101 receives a charging confirmation signal fed back by the electric vehicle, that is, after the charging control module 101 determines that the electric vehicle has established a charging connection with the charging test equipment 10, it controls the CP signal generating circuit to send a target pulse width modulation signal to the electric vehicle to indicate the target charging capacity of the electric vehicle.

[0086] Among them, the charging connection signal represents different meanings according to the output voltage of the CC signal generating circuit. For example, when the voltage of the CC signal is 0V, it indicates that the electric vehicle AC charging system currently does not support charging; when the voltage of the CC signal is 6V, it indicates that the electric vehicle AC charging system currently supports maximum charging power charging; when the voltage of the CC signal is 9V, it indicates that the electric vehicle AC charging system supports communication charging; when the voltage of the CC signal is 12V, it indicates that the electric vehicle AC charging system supports reduced power charging.

[0087] Optionally, after detecting the resistance in the CC signal generating circuit, the electric vehicle closes the S2 switch in the electric vehicle, and the electric vehicle determines to establish a charging connection with the charging test device 10 .

[0088] Among them, the initial value of the CP signal generator is 12V; when the charging test equipment 10 establishes a charging connection with the electric vehicle, the voltage of the CP signal generator changes to 9V; when the electric vehicle establishes a charging connection with the charging test equipment 10, after the electric vehicle closes the switch S2, the voltage of the CP signal generator changes to 6V, indicating that the electric vehicle is ready for charging.

[0089] In an optional embodiment, see Figure 6 In the charging test device 10 provided in the embodiment of the present application, the abnormal waveform injection unit 1031 is the AC harmonic injection unit 311, and the abnormal waveform collection unit 1032 is the harmonic collection unit 321, wherein the input end of the AC-AC conversion module 102 is externally connected to the AC power distribution cabinet, the input end of the harmonic collection unit 321 is connected to the output end of the AC harmonic injection unit 311, and the output end of the harmonic collection unit 321 is communicatively connected to the charging control module 101.

[0090] The first input end of the AC harmonic injection unit 311 is connected to the output end of the AC-AC conversion module 102 , the second input end of the AC harmonic injection unit 311 is communicatively connected to the charging control module 101 , and the output end of the AC harmonic injection unit 311 is connected to the input end of the switch module 105 .

[0091] In an optional implementation, the abnormal waveform injection unit injects an interference signal into the AC signal according to the test parameter information to obtain a target AC signal, including:

[0092] The AC harmonic injection unit 311 injects an interference signal into the AC signal according to the test parameter information to obtain a target AC signal. The test parameter information includes: a test harmonic parameter.

[0093] Optionally, the AC harmonic injection unit 311 injects a harmonic interference signal into the AC signal provided by the AC-AC conversion module 102 according to the harmonic parameters in the test parameter information sent by the charging control module 101. The harmonic interference signal is used to indicate a signal that interferes with the voltage harmonics and current harmonics of the AC, and the harmonic amount contained in the AC output by the AC-AC conversion module 102 is the same as the harmonic amount represented by the test parameter information set in the charging control module 101. The harmonic order of the harmonic interference signal ranges from 2 to 50.

[0094] Optionally, the AC harmonic injection unit 311 injects a harmonic interference signal into the AC power signal according to the test harmonic parameter indicated by the test parameter information to generate a target AC power signal, and transmits the target AC power signal to the electric vehicle via the switch module 105 .

[0095] Optionally, the AC-AC conversion module 102 is externally connected to an AC distribution cabinet, which is used to provide AC power to the charging test equipment 10. Under the action of the charging control module 101, the AC-AC conversion module 102 converts the AC signal provided by the AC distribution cabinet into an AC signal indicated by the test case.

[0096] For an alternative implementation, see Figure 3 , after the AC harmonic injection unit injects an interference signal into the AC signal according to the test parameter information to obtain the target AC signal, it includes:

[0097] S301. The harmonic collection unit collects the target AC power signal output by the AC harmonic injection unit in real time, calculates the harmonic content contained in the target AC power signal, and sends the calculated harmonic content to the charging control module.

[0098] Optionally, the harmonic acquisition unit 321 is used to acquire the target AC signal output by the AC harmonic injection unit 311. The harmonic acquisition unit 321 acquires the AC voltage and AC current contained in the target AC signal, and calculates the harmonic content of the AC voltage at each harmonic order and the harmonic content of the AC current at each harmonic order in the target AC. The harmonic content is used to indicate the content of interfering harmonics in the target AC signal.

[0099] S302: The charging control module determines whether there is a harmonic injection fault in the AC harmonic injection unit based on a preset test case and the harmonic content contained in the received target AC power signal.

[0100] Optionally, the charging control module 101 determines whether the AC harmonic injection unit 311 has a harmonic injection fault according to a comparison result between the harmonic content in the target AC power signal actually output by the AC harmonic injection unit 311 and the harmonic content set in the test case.

[0101] Optionally, if the harmonic content in the target AC power signal actually output by the AC harmonic injection unit 311 is different from the harmonic content set in the test case, there is a harmonic injection fault in the AC harmonic injection unit 311, and the charging control module 101 suspends the charging test process of the electric vehicle; if the harmonic content in the target AC power signal actually output by the AC harmonic injection unit 311 is the same as the harmonic content set in the test case, there is no harmonic injection fault in the AC harmonic injection module, and the charging test device 10 continues to test the charging performance of the electric vehicle.

[0102] In an optional embodiment, see Figure 7 The charging control module 101 in the charging test device 10 provided in the embodiment of the present application includes: a test case editor 1011. The above charging signal simulation method also includes:

[0103] The charging control module 101 sets the test case through the test case editor 1011 . The test case includes: an AC signal and test harmonic parameters. The test harmonic parameters include: the number of interference harmonics, the content of interference harmonics and the duration of interference harmonics.

[0104] Optionally, the charging control module 101 edits and sets the test case through the test case editor 1011, and the test case includes: an AC signal and a test harmonic parameter, and the test harmonic parameter includes: an interference harmonic order, an interference harmonic content, and an interference harmonic duration. The AC signal is used to indicate that the charging test device 10 provides a pure controllable AC power for the electric vehicle. The test harmonic parameter is used to indicate the interference harmonic parameters that the AC harmonic injection module needs to inject into the controllable AC power. The interference harmonic order is used to indicate the number of times the AC harmonic injection module injects interference harmonics into the AC signal. The interference harmonic content is used to indicate the proportion of interference harmonics injected into the AC signal by the AC harmonic injection module. The interference harmonic duration is used to indicate the duration of each time the AC harmonic injection module injects interference harmonics into the AC signal.

[0105] In an optional embodiment, see Figure 8 The switch module 105 in the charging test device 10 provided in the embodiment of the present application includes: a first contactor 1051 , a second contactor 1052 , a third contactor 1053 and a fourth contactor 1054 .

[0106] The control end of the first contactor 1051 , the control end of the second contactor 1052 , the control end of the third contactor 1053 , and the control end of the fourth contactor 1054 are all connected to the charging control module 101 for communication.

[0107] Optionally, the charging control module 101 is used to control the first contactor 1051, the second contactor 1052, the third contactor 1053 and the fourth contactor 1054 to be turned on and off, wherein the first contactor 1051, the second contactor 1052, the third contactor 1053 and the fourth contactor 1054 are all turned on or off synchronously.

[0108] An input end of the first contactor 1051 , an input end of the second contactor 1052 , an input end of the third contactor 1053 , and an input end of the fourth contactor 1054 are all connected to an output end of the AC harmonic injection unit 311 .

[0109] The output end of the first contactor 1051 , the output end of the second contactor 1052 , the output end of the third contactor 1053 , and the output end of the fourth contactor 1054 are all connected to the electric vehicle and the first input end of the signal acquisition module 104 .

[0110] Optionally, the target AC signal output by the AC harmonic injection unit 311 is transmitted to the charging port of the electric vehicle via the first contactor 1051, the second contactor 1052, the third contactor 1053 and the fourth contactor 1054, and the signal acquisition module 104 collects the target AC signal output by the AC harmonic injection unit 311 via the output end of the first contactor 1051, the output end of the second contactor 1052, the output end of the third contactor 1053 and the output end of the fourth contactor 1054.

[0111] After receiving the charging confirmation signal, the charging control module 101 controls the first contactor 1051, the second contactor 1052, the third contactor 1053 and the fourth contactor 1054 to be closed, and when the electric vehicle finishes charging, controls the first contactor 1051, the second contactor 1052, the third contactor 1053 and the fourth contactor 1054 to be opened.

[0112] Optionally, the first contactor 1051, the second contactor 1052, the third contactor 1053 and the fourth contactor 1054 in the switch module 105 are turned on when the electric vehicle starts charging and turned off when the electric vehicle stops charging, which can effectively play a role of overcurrent protection.

[0113] In an optional embodiment, see Fig. 9 The signal acquisition module 104 in the charging test device 10 provided in the embodiment of the present application further includes: an oscilloscope 1041. The oscilloscope 1041 is used to display the waveform and timing of the signal collected by the signal acquisition module 104. The charging signal simulation method provided in the embodiment of the present application further includes:

[0114] The signal acquisition module 104 acquires the charging connection signal, the target pulse width modulation signal and the actual input AC power signal of the electric vehicle in real time, and displays the waveform of the charging connection signal, the waveform of the target pulse width modulation signal and the waveform of the actual input AC power signal through the oscilloscope 1041 in the signal acquisition module 104.

[0115] Optionally, the signal acquisition module 104 collects in real time the CC signal, CP signal sent by the AC guidance module 106 to the electric vehicle, and the AC signal actually input to the charging port of the electric vehicle, and generates a corresponding waveform according to the timing of the CC signal, CP signal, and the AC signal actually input to the charging port of the electric vehicle.

[0116] In an optional implementation, Fig.10 For the mainstream workflow diagram of a charging test device provided in this application, see Fig.10The mainstream workflow of the charging test device provided in the embodiment of the present application includes: a connection confirmation stage, a readiness stage, an energy input stage, a harmonic injection stage, and a charging end stage. Among them, the connection confirmation stage is used to determine whether the charging test device 10 has established a charging connection with the charging port of the electric vehicle, the readiness stage refers to the stage in which the charging test device 10 is capable of providing a charging simulation signal to the electric vehicle, the energy input stage is used to indicate the stage in which the charging test device 10 provides a charging signal to the electric vehicle, the harmonic injection stage is used to indicate the stage in which the charging test device is used to simulate an abnormal power supply signal interfered by an abnormal signal, and the charging end stage is used to indicate the stage in which the electric vehicle ends charging.

[0117] In an optional implementation, Fig.11 For a working diagram of a charging test device provided in this application, see Fig.11 The specific working process of the charging test device provided in the embodiment of the present application is as follows: after the charging test device establishes a charging connection with the electric vehicle, the first controllable switch and the second controllable switch in the AC guide module are controlled to be closed and turned on, and the control end of the third controllable switch is controlled to switch to the CP signal generator, and the fourth controllable switch in the AC guide module is controlled to be closed and turned on; based on whether the electric vehicle recognizes the resistance value of the inspection resistor RC, it is determined whether the electric vehicle has established a charging connection with the charging test device; if the electric vehicle recognizes the resistance value of the RC resistor in the AC guide module, the S2 switch inside the electric vehicle is closed, and the electric vehicle determines to establish a charging connection with the charging test device; detect whether the voltage of the CP signal generator in the AC guide module changes from 9V to 6V, that is, whether the charging test device currently has AC charging conditions; if the voltage of the CP signal generator in the AC guide module changes from 9V to 6V, Then the control end of the third controllable switch in the AC guide module is controlled to switch to the pulse width signal generator to provide the target pulse width modulation signal for the electric vehicle, and the first contactor, the second contactor, the third contactor and the fourth contactor in the switch module are controlled to be closed and turned on; it is judged whether the harmonic injection time indicated by the test case is reached at the current moment, and if so, the test parameter information in the test case is edited, and after the editing is completed, the harmonic injection unit is started to inject harmonic interference into the AC signal output by the AC-AC conversion module; the electric vehicle is charged based on the simulated AC signal interfered by the harmonics. When the electric vehicle finishes charging, the control end of the third controllable switch in the AC guide module is controlled to switch to the CP signal generator, and the harmonic injection unit and the AC-AC conversion module are turned off, and the first contactor, the second contactor, the third contactor and the fourth contactor in the switch module are controlled to be disconnected, and the charging of the electric vehicle is finished.

[0118] Fig.12 A schematic diagram of the structure of a charging test system provided in this application, see Fig.12A charging test system 20 provided in an embodiment of the present application includes: a communication module 201 and a control module 202, wherein the communication module 201 is connected to an external device for communication, and the control module 202 is used to implement the steps in any of the above embodiments. The communication module 201 is used to upload the data generated during the charging control process of the control module 202 to the external device.

[0119] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0120] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A charging signal simulation method, characterized in that: The method is applied to a charging control module in a charging test device, the charging test device comprising: the charging control module, an AC-AC conversion module, an abnormal waveform simulation module, a signal acquisition module, a switch module and an AC guide module, the method comprising: The charging control module obtains a charging connection signal sent by the electric vehicle, and controls the AC guidance module to send a target pulse width modulation signal to the electric vehicle; The charging control module sends test parameter information to the abnormal waveform simulation module according to a preset test case, and controls the AC-AC conversion module to send an AC signal indicated by the test case to the abnormal waveform simulation module; The abnormal waveform simulation module injects an interference signal into the AC signal based on the test parameter information to generate a target AC signal, and sends the target AC signal to the electric vehicle via the switch module; The charging control module generates a charging test result of the electric vehicle according to the charging connection signal, the target pulse width modulation signal and the alternating current signal sent by the signal acquisition module.

2. The charging signal simulation method according to claim 1, characterized in that: The abnormal waveform simulation module includes: an abnormal waveform injection unit, and the abnormal waveform simulation module injects an interference signal into the AC signal based on the test parameter information to generate a target AC signal, including: The abnormal waveform injection unit injects an interference signal into the AC signal according to the test parameter information to obtain a target AC signal. The test parameter information includes: a test waveform parameter.

3. The charging signal simulation method according to claim 2, characterized in that: The abnormal waveform simulation module further includes: an abnormal waveform acquisition unit, and the abnormal waveform injection unit injects an interference signal into the AC signal according to the test parameter information to obtain a target AC signal, and then includes: The abnormal waveform acquisition unit acquires the target AC power signal output by the abnormal waveform injection unit in real time, calculates the harmonic content contained in the target AC power signal, and sends the calculated harmonic content to the charging control module; The charging control module determines whether the abnormal waveform injection unit has an abnormal waveform injection fault based on a preset test case and the harmonic content included in the target AC power signal.

4. The charging signal simulation method according to claim 2, characterized in that: The abnormal waveform injection unit includes: an AC harmonic injection unit, wherein the abnormal waveform injection unit injects an interference signal into the AC signal according to the test parameter information to obtain a target AC signal, including: The AC harmonic injection unit injects an interference signal into the AC power signal according to the test parameter information to obtain a target AC power signal. The test parameter information includes: a test harmonic parameter.

5. The charging signal simulation method according to claim 3, characterized in that: The abnormal waveform acquisition unit includes: a harmonic acquisition unit, and an AC harmonic injection unit injects an interference signal into the AC signal according to the test parameter information to obtain a target AC signal, and then includes: The harmonic collection unit collects the target AC power signal output by the AC harmonic injection unit in real time, calculates the harmonic content contained in the target AC power signal, and sends the calculated harmonic content to the charging control module; The charging control module determines whether the AC harmonic injection unit has an AC harmonic injection fault based on a preset test case and the harmonic content contained in the received target AC power signal.

6. The charging signal simulation method according to claim 1, characterized in that: The charging control module controls the AC-AC conversion module to send the AC signal indicated by the test case to the abnormal waveform simulation module, including: The AC-AC conversion module is used to convert the AC power signal provided by the AC power distribution cabinet under the control of the charging control module to obtain the AC power signal indicated by the test case and send it to the abnormal waveform simulation module.

7. The charging signal simulation method according to claim 1, characterized in that: The charging control module includes: a test case editor, and the method further includes: The charging control module sets a test case through the test case editor, and the test case includes: an alternating current signal and a test harmonic parameter, and the test harmonic parameter includes: an interference harmonic order, an interference harmonic content, and an interference harmonic duration.

8. The charging signal simulation method according to claim 1, characterized in that: The signal acquisition module includes: an oscilloscope, and the method further includes: The signal acquisition module acquires the charging connection signal, the target pulse width modulation signal and the actual input AC power signal of the electric vehicle in real time, and displays the waveform of the charging connection signal, the waveform of the target pulse width modulation signal and the waveform of the actual input AC power signal through the oscilloscope in the signal acquisition module.

9. A charging test device, characterized in that: The charging test equipment comprises: a charging control module, an AC-AC conversion module, an abnormal waveform simulation module, a switch module and an AC guide module, wherein the output end of the abnormal waveform simulation module is connected to the input end of the switch module, the output end of the switch module is externally connected to the electric vehicle, the first input end of the signal acquisition module is connected to the charging port of the electric vehicle, and the second input end of the signal acquisition module is connected to the output end of the AC guide module; The charging control module is used to implement the steps of the charging signal simulation method according to any one of claims 1-8.

10. A charging test system, characterized in that: The charging test system comprises: a control module and a communication module, the communication module is connected to an external device, and the control module is used to implement the steps of the charging signal simulation method according to any one of claims 1 to 8.

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