High-voltage connection abnormity detection system of electric vehicle and electric vehicle

Abstract

The high-voltage connection abnormity detection system is applied to an electric transmission network of the electric vehicle, the electric transmission network comprises a voltage source and a power utilization terminal, the output end of the voltage source is connected with the input end of the power utilization terminal through a power line and a connector, and the high-voltage connection abnormity detection system comprises a detection waveform generation module, the waveform generator is connected with the output end of the voltage source and is used for generating an original detection waveform and coupling the original detection waveform into an electric transmission network; and the detection module is connected with the input end of the power utilization terminal and is used for identifying a target detection waveform corresponding to the original detection waveform from the input end of the power utilization terminal, comparing the target detection waveform with the original detection waveform and determining whether abnormal connection exists between the voltage source and the power utilization terminal. According to the embodiment of the invention, a traditional HVIL ring is omitted, so that the number of wire harness loops in the electric vehicle is reduced, the complexity of wire harnesses in the electric vehicle is reduced, and the convenience of detection and maintenance of the electric vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a high-voltage connection abnormality detection system for an electric vehicle and an electric vehicle. Background Art

[0002] The current high-voltage connector system of electric vehicles uses an internal high-voltage interlock loop (HVIL) to determine whether there is a connection abnormality in the high-voltage connector. When there is a problem with the connection of the high-voltage connector system, the HVIL ring signal will be interrupted or the resistance will be too large. The battery management system (BMS) will perform a threshold judgment on the resistance of the HVIL ring. When the threshold is exceeded, it is judged that the high-voltage connector system is poorly connected. The BMS will power off the high voltage or implement safety level countermeasures.

[0003] However, when detecting abnormal high-voltage connector connections through the HVIL loop, a separate contact quality test loop must be set up. The loop forms a daisy chain and then enters the BMS. The BMS determines the fault based on the contact resistance or contact signal quality. In other words, it is necessary to design a separate contact contact (low voltage) on the high-voltage connector, and use the low-voltage wiring harness to form a daisy chain and enter the BMS. This structure will result in multiple wiring harness loops in the electric vehicle, making the internal wiring harness of the electric vehicle complicated and inconvenient for electric vehicle inspection and maintenance. Utility Model Content

[0004] In order to solve the problems in the prior art, the embodiments of this document provide a high-voltage connection abnormality detection system for an electric vehicle and an electric vehicle. The embodiments of this specification utilize high-frequency carrier power line transmission technology. A fixed-frequency signal is generated by a fixed-frequency signal generating module in a voltage source PACK, and the fixed-frequency signal carrier is modulated by a high-frequency carrier technology to obtain a high-frequency power carrier signal. The signal is coupled to the high-voltage transmission network in the electric vehicle through a coupler, and transmitted to the high-voltage power terminal through a high-voltage connector. At the high-voltage power terminal, the high-frequency power carrier signal on the high-voltage transmission network is coupled to a filtering module. The filtering frequency selection circuit in the filtering module analyzes the high-frequency power carrier signal, proposes a fixed-frequency signal, and compares the original fixed-frequency signal generated in the voltage source PACK with the proposed fixed-frequency signal to determine whether there is a connection abnormality in the high-voltage connector.

[0005] In one aspect, embodiments of this specification provide a high-voltage connection anomaly detection system for an electric vehicle, which is applied to an electric vehicle power transmission network. The power transmission network includes a voltage source and a power terminal. The output end of the voltage source is connected to the input end of the power terminal via a power line and a connector, and includes:

[0006] A detection waveform generating module is connected to the output end of the voltage source, and is used to generate an original detection waveform, and couple the original detection waveform to the electric transmission network for transmission through the power lines in the electric transmission network;

[0007] The detection module is connected to the input end of the power terminal and is used to identify the target detection waveform corresponding to the original detection waveform from the input end of the power terminal, compare the target detection waveform with the original detection waveform, and determine whether there is a connection abnormality between the voltage source and the power terminal.

[0008] Furthermore, the detection waveform generating module includes a waveform generator, a first coupler and a first isolator, wherein the first coupler and the first isolator are connected in series and are connected in series between the waveform generator and the output terminal of the voltage source;

[0009] The waveform generator is used to generate a waveform of a specified frequency as the original detection waveform;

[0010] The first coupler is used to couple the original detection waveform into the electrical transmission network;

[0011] The first isolator is used to isolate the original detection waveform generated by the waveform generator from the voltage at the output end of the voltage source.

[0012] Furthermore, the first coupler is a capacitor.

[0013] Furthermore, the waveform of the specified frequency generated by the waveform generator is a square wave or a sine wave.

[0014] Furthermore, the detection module includes a second coupler, a second isolator, a frequency selector and a waveform comparison submodule, and the second coupler, the second isolator and the frequency selector are connected in series and in series between the waveform comparison submodule and the input end of the power terminal;

[0015] The second coupler is used to extract the AC signal from the input end of the power terminal to obtain a waveform to be processed;

[0016] The frequency selector is used to extract the target detection waveform corresponding to the original detection waveform from the waveform to be processed;

[0017] The waveform comparison submodule is used to compare the target detection waveform with the original detection waveform to determine whether there is any abnormal connection between the voltage source and the power terminal;

[0018] The second isolator is used to isolate the target detection waveform input by the waveform comparison submodule from the voltage at the input end of the power terminal.

[0019] Furthermore, the second coupler is a capacitor.

[0020] Furthermore, the detection module further includes a reference waveform generation submodule for generating a reference waveform based on waveform parameters of the original detection waveform;

[0021] The waveform comparison submodule includes a subtractor and a comparator;

[0022] The first input end of the subtractor is connected to the output end of the frequency selector, the second input end of the subtractor is connected to the output end of the reference waveform generation submodule, and the subtractor is used to output the difference between the target detection waveform and the reference waveform;

[0023] The first input terminal of the comparator is connected to the output terminal of the subtractor, and the second input terminal of the comparator inputs a predetermined voltage threshold. The comparator is used to compare the difference with the predetermined voltage threshold to determine whether there is a connection abnormality between the voltage source and the power terminal.

[0024] Furthermore, the detection module also includes a filter and an amplifier;

[0025] The input end of the filter is connected to the output end of the frequency selector and is used to filter the target detection waveform output by the frequency selector;

[0026] The input end of the amplifier is connected to the output end of the filter, and the output end of the amplifier is connected to the first input end of the comparator. The amplifier is used to amplify the filtered target detection waveform and input the amplified target detection waveform into the comparator through the first input end of the comparator.

[0027] Further, the detection waveform generating module includes a first detection waveform generating submodule and a second detection waveform generating submodule;

[0028] The output end of the first detection waveform generating submodule is connected to the negative electrode of the voltage source, and is used to couple the negative signal of the original detection waveform into the negative loop of the power transmission network and transmit it through the power line of the negative loop in the power transmission network;

[0029] The output end of the second detection waveform generating submodule is connected to the positive electrode of the voltage source, and is used to couple the positive signal of the original detection waveform into the positive loop of the power transmission network and transmit it through the power line of the positive loop in the power transmission network.

[0030] Further, the detection module includes a first detection submodule and a second detection submodule;

[0031] The input end of the first detection submodule is connected to the negative electrode of the power terminal, and is used to identify the negative signal of the target detection waveform corresponding to the negative signal of the original detection waveform from the negative electrode of the power terminal, compare the negative signal of the target detection waveform with the negative signal of the original detection waveform, and determine whether there is a connection abnormality in the negative circuit between the voltage source and the power terminal;

[0032] The input end of the second detection submodule is connected to the positive pole of the power terminal, and is used to identify the positive signal of the target detection waveform corresponding to the positive signal of the original detection waveform from the positive pole of the power terminal, compare the positive signal of the target detection waveform with the positive signal of the original detection waveform, and determine whether there is a connection abnormality in the positive circuit between the voltage source and the power terminal.

[0033] Furthermore, the high-voltage connection abnormality detection system for electric vehicles also includes a filtering module, which is connected to the input end of the detection module and is used to filter the voltage input to the power terminal after the detection module recognizes the target detection waveform.

[0034] Furthermore, the filtering module is a capacitor.

[0035] On the other hand, an embodiment of this specification further provides an electric vehicle, comprising: a voltage source, at least one power terminal, and the above-mentioned high-voltage connection abnormality detection system for the electric vehicle;

[0036] The high-voltage connection anomaly detection system of an electric vehicle is used to determine whether there is a connection anomaly between the voltage source and the power terminal.

[0037] The embodiments of this specification abandon the structure of the traditional HVIL ring for detecting high-voltage connectors, and instead use power carrier communication technology to deploy a detection waveform generation module at the voltage source to generate the original detection waveform, couple the original detection waveform to the power transmission network, and transmit it through the power line. The detection module is deployed at the power terminal to identify the target detection waveform corresponding to the original detection waveform from the power line. The detection module then compares the target detection waveform with the original detection waveform to determine whether there is a connection abnormality between the voltage source and the power terminal. Through the high-voltage connection abnormality detection system of the electric vehicle of the embodiment of this specification, the traditional HVIL ring can be eliminated, thereby reducing the number of wiring harness loops in the electric vehicle, reducing the complexity of the internal wiring harness of the electric vehicle, and improving the convenience of detection and maintenance of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of this article or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of this article. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 is a schematic diagram of the high-voltage system topology of an electric vehicle in an embodiment of this specification;

[0040] Figure 2 This is a topological diagram of a traditional HVIL system in the embodiments of this specification;

[0041] Figure 3 This is a first structural diagram of a high-voltage connection abnormality detection system for an electric vehicle according to an embodiment of this specification;

[0042] Figure 4 is a schematic structural diagram of a detection waveform generating module in an embodiment of this specification;

[0043] Figure 5 is a first structural diagram of the detection module in the embodiment of this specification;

[0044] Figure 6 is a second structural diagram of the detection module in the embodiment of this specification;

[0045] Figure 7 is a third structural diagram of the detection module in the embodiment of this specification;

[0046] Figure 8 is a fourth structural diagram of the detection module in the embodiment of this specification;

[0047] Figure 9 This is a second structural diagram of the high-voltage connection abnormality detection system for an electric vehicle according to an embodiment of this specification;

[0048] Figure 10 This is a third structural diagram of the high-voltage connection abnormality detection system for an electric vehicle in the embodiment of this specification.

[0049] [Description of Reference Numerals]

[0050] 11. Voltage source;

[0051] 12. Power terminals;

[0052] 13. Power lines;

[0053] 14. Connector;

[0054] 101. Detection waveform generating module;

[0055] 1011. Waveform generator;

[0056] 1012. First coupler;

[0057] 1013, first isolator;

[0058] 102. Detection module;

[0059] 1021, second coupler;

[0060] 1022, second isolator;

[0061] 1023, frequency selector;

[0062] 1204, waveform comparison submodule;

[0063] 10241, subtractor;

[0064] 10242, comparator;

[0065] 1025. Reference waveform generation submodule;

[0066] 1026, filter;

[0067] 1027, amplifier;

[0068] 103. Filter module;

[0069] 111. First detection waveform generating submodule;

[0070] 112. Second detection waveform generating submodule;

[0071] 121. First detection submodule;

[0072] 122. Second detection submodule. DETAILED DESCRIPTION

[0073] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of this document. Obviously, the embodiments described are only part of the embodiments of this document, not all of the embodiments. Based on the embodiments of this document, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this document.

[0074] Figure 1 The figure shows a schematic diagram of the high-voltage system topology of an electric vehicle in an embodiment of this specification, including a voltage source PACK, a power distribution unit (PDU), and multiple high-voltage power terminals (T-devices). PTC represents the temperature control management system of the electric motor, DC / DC represents the high-voltage direct current to low-voltage direct current conversion module in the electric vehicle, and Compress represents the compressor. The PDU is used to distribute the voltage of the voltage source PACK to each high-voltage power terminal, wherein the high-voltage power terminals, voltage source, and PDU are mostly connected through high-voltage connectors.

[0075] The topology diagram of the traditional HVIL system is as follows: Figure 2As shown, an HVIL connector is deployed at the high-voltage terminal, forming an HVIL loop inside the electric vehicle. If the high-voltage connector is connected properly, the HVIL connector at the high-voltage terminal will receive an electrical signal and notify the Battery Management System (BMS). If the high-voltage connector is connected abnormally, the HVIL connector will become loose, causing the resistance of the HVIL loop to increase, thereby detecting whether the high-voltage terminal is loose.

[0076] However, when detecting abnormal high-voltage connector connections through the HVIL loop, a separate contact quality test loop must be set up. The loop forms a daisy chain and then enters the BMS. The BMS determines the fault based on the contact resistance or contact signal quality. In other words, it is necessary to design a separate contact contact (low voltage) on the high-voltage connector, and use the low-voltage wiring harness to form a daisy chain and enter the BMS. This structure will result in multiple wiring harness loops in the electric vehicle, making the internal wiring harness of the electric vehicle complicated and inconvenient for electric vehicle inspection and maintenance.

[0077] In view of the problems existing in the prior art, the embodiments of this specification provide a high voltage connection abnormality detection system for a motor vehicle, such as Figure 3 As shown, in an electric transmission network for electric vehicles, the electric transmission network includes a voltage source 11 and an electric terminal 12. The output end of the voltage source 11 is connected to the input end of the electric terminal via a power line 13 and a connector 14, including:

[0078] The detection waveform generating module 101 is connected to the output end of the voltage source 11 and is used to generate the original detection waveform and couple the original detection waveform to the power transmission network for transmission via the power line 13 in the power transmission network;

[0079] The detection module 102 is connected to the input end of the power terminal 12, and is used to identify the target detection waveform corresponding to the original detection waveform from the input end of the power terminal 12, compare the target detection waveform with the original detection waveform, and determine whether there is a connection abnormality between the voltage source 11 and the power terminal 12.

[0080] In the embodiment of the present specification, the detection waveform can be a power carrier signal, which is a signal transmitted through the power line. In the embodiment of the present specification, the detection waveform generation module 101 generates a power carrier signal at the voltage source 11, couples the power carrier signal to the output end of the voltage source 11, and transmits it through the power line in the power transmission network, passes through the connector 14, and is transmitted to the power terminal 12. The detection module 102 identifies the power carrier signal corresponding to the original power carrier signal at the input end of the power terminal 12, and then the two signal waveforms can be compared through a comparison circuit. If the difference between the two is not large, it indicates that the connector 14 is connected normally, otherwise it indicates that the connector 14 is connected abnormally.

[0081] It should be noted that, in the embodiment of this specification, after the detection waveform generating module 101 generates the power carrier signal, modulation may not be performed, that is, no additional information is added to the power carrier signal. The detection module 102 only needs to compare the waveform of the power carrier signal at the power terminal 12 with the waveform of the power carrier signal at the voltage source 11, and does not need to care about the information transmitted by the power carrier signal.

[0082] According to one embodiment of this specification, Figure 4 As shown, the detection waveform generating module 101 includes a waveform generator 1011, a first coupler 1012 and a first isolator 1013. The first coupler 1012 and the first isolator 1013 are connected in series and are connected in series between the waveform generator 1011 and the output end of the voltage source 11.

[0083] The waveform generator 1011 is used to generate a waveform of a specified frequency as the original detection waveform;

[0084] The first coupler 1012 is used to couple the original detection waveform into the electrical transmission network;

[0085] The first isolator 1013 is used to isolate the original detection waveform generated by the waveform generator 1011 from the voltage at the output end of the voltage source 11 .

[0086] In the embodiments of this specification, a waveform generator commonly used in the prior art can be used to generate a power carrier signal, or to generate a waveform of a specified frequency as a square wave or a sine wave, which is not limited in the embodiments of this specification.

[0087] In the embodiment of this specification, the first coupler 1012 is a capacitor. The embodiment of this specification utilizes the "AC passing and DC blocking" characteristics of the capacitor to couple the AC square wave or sine wave to the output end of the voltage source 11, thereby transmitting it through the power line.

[0088] In the embodiments of this specification, the first isolator 1013 can isolate the waveform generated by the waveform generator 1011 from the voltage at the output end of the voltage source 11. Exemplarily, the first isolator 1013 may include a primary coil and a secondary coil, and the waveform generated by the waveform generator 1011 is transferred from the primary coil to the secondary coil through electromagnetic induction, thereby achieving isolation.

[0089] It should be noted that the embodiment of this specification does not limit the series connection order between the first coupler 1012 and the first isolator 1013 .

[0090] According to one embodiment of this specification, Figure 5As shown, the detection module 102 includes a second coupler 1021, a second isolator 1022, a frequency selector 1023 and a waveform comparison submodule 1024. The second coupler 1021, the second isolator 1022 and the frequency selector 1023 are connected in series and are connected in series between the waveform comparison submodule 1024 and the input end of the power terminal 12.

[0091] The second coupler 1021 is used to extract the AC signal from the input end of the power terminal 12 to obtain a waveform to be processed;

[0092] The frequency selector 1023 is used to extract the target detection waveform corresponding to the original detection waveform from the waveform to be processed;

[0093] The waveform comparison submodule 1024 is used to compare the target detection waveform with the original detection waveform to determine whether there is a connection abnormality between the voltage source 11 and the power terminal 12;

[0094] The second isolator 1022 is used to isolate the target detection waveform input by the waveform comparison submodule 1024 from the voltage at the input end of the power terminal 12 .

[0095] In the embodiments of this specification, the second coupler 1021 can also be a capacitor. The capacitor's characteristic of "passing AC and blocking DC" is utilized to extract all AC signals transmitted in the power line. The AC signals are then passed through the second isolator 1022 and the frequency selector 1023. The frequency selector 1023 extracts a waveform corresponding to the period, frequency, amplitude, etc. of the original detection waveform from these waveforms to obtain the target detection waveform. The waveform comparison submodule 1024 then compares the original detection waveform with the target detection waveform. If the two match, it indicates that there is no abnormality in the high-voltage connection.

[0096] In the embodiment of this specification, the structure of the second isolator 1022 can refer to the first isolator 1013 and will not be described in detail in this embodiment of the specification.

[0097] The frequency selector 1023 may be a frequency selector commonly used in the prior art, and will not be described in detail in the embodiments of this specification.

[0098] In the embodiment of this specification, if the original detection waveform generated by the detection waveform generating module 101 at the voltage source 11 is input to the waveform comparison submodule 1024 through the deployment of additional electrical circuits, the wiring harness complexity in the electric vehicle will also increase. Figure 6 As shown, the detection module 102 further includes a reference waveform generation submodule 1025 for generating a reference waveform according to the waveform parameters of the original detection waveform.

[0099] Furthermore, if Figure 7As shown, the waveform comparison submodule 1024 includes a subtractor 10241 and a comparator 10242;

[0100] A first input terminal of the subtractor 10241 is connected to the output terminal of the frequency selector 1023, a second input terminal of the subtractor 10241 is connected to the output terminal of the reference waveform generation submodule 1024, and the subtractor 10241 is used to output the difference between the target detection waveform and the reference waveform;

[0101] The first input terminal of the comparator 10242 is connected to the output terminal of the subtractor 10241, and the second input terminal of the comparator 10242 inputs a predetermined voltage threshold. The comparator 10242 is used to compare the difference with the predetermined voltage threshold to determine whether there is a connection abnormality between the voltage source 11 and the power terminal 12.

[0102] In the embodiments of this specification, the predetermined voltage threshold may be an empirical value or an experimental value obtained through calibration, and this embodiment of this specification does not impose any limitation thereto.

[0103] Exemplarily, if the difference between the target detection waveform and the reference waveform (equivalent to the original detection waveform) exceeds a predetermined voltage threshold, it means that the gap between the target detection waveform and the original detection waveform is large, and the gap is caused by an abnormal connection of the high-voltage connector between the voltage source 11 and the power terminal 12. At this time, the comparator 10242 outputs a high level, otherwise the comparator 10242 outputs a low level.

[0104] In the embodiments of this specification, the output result of comparator 10242 (e.g., a high level output if a connection anomaly exists, and a low level output if no connection anomaly exists) can also be input into a communication module deployed in the power terminal, which is then forwarded by the communication module to the BMS in the electric vehicle, so that the BMS can promptly disconnect the high-voltage circuit to avoid accidents involving the electric vehicle. In addition, the output result can also be sent to the alarm system in the electric vehicle, carrying the name or number of the power terminal with the abnormal connection, so that the owner can promptly check and repair the abnormally connected power terminal.

[0105] Furthermore, the output of the comparator 10242 can be encoded through an A / D converter, and the connection quality can be determined based on the number of high-level occurrences. An upper limit domain of the number of times can be set to determine the alarm or high-voltage power-off measures.

[0106] In some other embodiments of the present specification, filters and amplifiers can also be deployed on the input links of the target detection waveform and the reference waveform, and the filters and amplifiers can be connected in series and connected in series between the input end of the waveform comparison submodule 1024 and the input end of the subtractor 10241 (not shown in the figure), thereby improving the signal quality of the two, facilitating the subtractor 10241 to calculate the difference between the two, and improving the detection accuracy. Furthermore, the cable resistance and the connector contact resistance can also be connected in series on the input link of the target detection waveform, which will not be repeated here.

[0107] According to one embodiment of this specification, in order to further improve the signal quality, as Figure 8 As shown, the detection module 102 further includes a filter 1026 and an amplifier 1027;

[0108] The input end of the filter 1026 is connected to the output end of the frequency selector 1023 and is used to filter the target detection waveform output by the frequency selector 1023;

[0109] The input end of the amplifier 1027 is connected to the output end of the filter 1026, and the output end of the amplifier 1027 is connected to the first input end of the comparator 10242. The amplifier 1027 is used to amplify the filtered destination detection waveform and input the amplified destination detection waveform into the comparator 10242 through the first input end of the comparator 10242.

[0110] According to one embodiment of this specification, Figure 9 As shown, the detection waveform generating module 101 includes a first detection waveform generating submodule 111 and a second detection waveform generating submodule 112;

[0111] The output end of the first detection waveform generating submodule 111 is connected to the negative electrode of the voltage source 11, and is used to couple the negative signal of the original detection waveform into the negative loop of the power transmission network and transmit it through the power line of the negative loop in the power transmission network;

[0112] The output end of the second detection waveform generating submodule 112 is connected to the positive electrode of the voltage source 11, and is used to couple the positive signal of the original detection waveform into the positive loop of the power transmission network and transmit it through the power line of the positive loop in the power transmission network.

[0113] The structures of the first detection waveform generating submodule 111 and the second detection waveform generating submodule 112 may refer to the detection waveform generating module 101 and will not be described in detail here.

[0114] The detection module 102 includes a first detection submodule 121 and a second detection submodule 122;

[0115] The input end of the first detection submodule 121 is connected to the negative electrode of the power terminal 12, and is used to identify the negative signal of the target detection waveform corresponding to the negative signal of the original detection waveform from the negative electrode of the power terminal 12, compare the negative signal of the target detection waveform with the negative signal of the original detection waveform, and determine whether there is a connection abnormality in the negative circuit between the voltage source 11 and the power terminal 12;

[0116] The input end of the second detection submodule 122 is connected to the positive pole of the power terminal 12, and is used to identify the positive signal of the target detection waveform corresponding to the positive signal of the original detection waveform from the positive pole of the power terminal 12, compare the positive signal of the target detection waveform with the positive signal of the original detection waveform, and determine whether there is a connection abnormality in the positive circuit between the voltage source 11 and the power terminal 12.

[0117] The structures of the first detection submodule 121 and the second detection submodule 122 may refer to the detection module 102 and will not be described in detail here.

[0118] It can be understood that the detection waveforms in the embodiments of this specification are transmitted separately at the positive and negative poles of the high-voltage transmission grid, and the positive and negative poles are judged separately. Once there is a problem with any of the waveforms, it can be determined that there is a connection abnormality, thereby improving the detection accuracy.

[0119] According to an embodiment of the present specification, since a detection waveform is added to the power transmission network, in order to prevent the detection waveform from affecting the normal operation of the high voltage load, such as Figure 10 As shown, the high-voltage connection abnormality detection system for electric vehicles also includes a filtering module 103, which is connected to the input end of the detection module 102 and is used to filter the voltage input to the power terminal 12 after the detection module 102 recognizes the target detection waveform.

[0120] Specifically, the filtering module 103 in the embodiment of this specification can be a capacitor, which is connected in parallel with the power terminal 12, and the parallel point is after the positive input terminal and the negative input terminal of the detection module 102. Therefore, after the detection module 102 extracts the target detection waveform from the power line, the filtering capacitor connected in parallel with the power terminal 12 filters out the detection waveform in the power line, thereby preventing the detection waveform from affecting the normal operation of the power terminal 12.

[0121] Furthermore, an embodiment of the present specification also provides an electric vehicle, including a voltage source, at least one power terminal, and a high-voltage connection abnormality detection system for an electric vehicle according to an embodiment of the present specification.

[0122] The high-voltage connection anomaly detection system of an electric vehicle is used to determine whether there is a connection anomaly between the voltage source and the power terminal.

[0123] It should be understood that in the various embodiments of this document, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

[0124] It should also be understood that in the embodiments herein, the term "and / or" merely describes an association between associated objects, indicating that three possible relationships exist. For example, "A and / or B" could represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0125] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the composition and steps of each example according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this document.

[0126] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0127] In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices, or units, or can be an electrical, mechanical, or other form of connection.

[0128] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments herein.

[0129] In addition, the functional units in the various embodiments herein may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0130] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this article is essentially or the part that contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of this article. The aforementioned storage medium includes: various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0131] This article uses specific embodiments to illustrate the principles and implementation methods of this article. The description of the above embodiments is only used to help understand the methods and core ideas of this article. At the same time, for those skilled in the art, based on the ideas of this article, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation to this article.

Claims

1. A high-voltage connection abnormality detection system for an electric vehicle, applied to an electric transmission network of the electric vehicle, wherein the electric transmission network comprises a voltage source (11) and an electric terminal (12), wherein the output end of the voltage source (11) and the input end of the electric terminal (12) are connected via a power line (13) and a connector (14), and wherein: include: A detection waveform generating module (101) is connected to the output end of the voltage source (11) and is used to generate an original detection waveform, and couple the original detection waveform to the electrical transmission network for transmission via a power line (13) in the electrical transmission network; A detection module (102) is connected to the input end of the power terminal (12) and is used to identify a target detection waveform corresponding to the original detection waveform from the input end of the power terminal (12), compare the target detection waveform with the original detection waveform, and determine whether there is a connection abnormality between the voltage source (11) and the power terminal (12).

2. The high-voltage connection abnormality detection system for an electric vehicle according to claim 1, characterized in that: The detection waveform generating module (101) comprises a waveform generator (1011), a first coupler (1012) and a first isolator (1013), wherein the first coupler (1012) and the first isolator (1013) are connected in series and are also connected in series between the waveform generator (1011) and the output end of the voltage source (11); The waveform generator (1011) is used to generate a waveform of a specified frequency as an original detection waveform; The first coupler (1012) is used to couple the original detection waveform into the electrical transmission network; The first isolator (1013) is used to isolate the original detection waveform generated by the waveform generator (1011) from the voltage at the output end of the voltage source (11).

3. The high-voltage connection abnormality detection system for an electric vehicle according to claim 2, characterized in that: The first coupler (1012) is a capacitor.

4. The high-voltage connection abnormality detection system for an electric vehicle according to claim 2, characterized in that: The waveform of the specified frequency generated by the waveform generator (1011) is a square wave or a sine wave.

5. The high-voltage connection abnormality detection system for an electric vehicle according to claim 1, characterized in that: The detection module (102) comprises a second coupler (1021), a second isolator (1022), a frequency selector (1023) and a waveform comparison submodule (1024); the second coupler (1021), the second isolator (1022) and the frequency selector (1023) are connected in series and are also connected in series between the waveform comparison submodule (1024) and the input end of the power terminal (12); The second coupler (1021) is used to extract the AC signal from the input end of the power terminal (12) to obtain a waveform to be processed; The frequency selector (1023) is used to extract a target detection waveform corresponding to the original detection waveform from the waveform to be processed; The waveform comparison submodule (1024) is used to compare the target detection waveform with the original detection waveform to determine whether there is a connection abnormality between the voltage source (11) and the power terminal (12); The second isolator (1022) is used to isolate the target detection waveform input by the waveform comparison submodule (1024) from the voltage at the input end of the power terminal (12).

6. The high-voltage connection abnormality detection system for an electric vehicle according to claim 5, characterized in that: The second coupler (1021) is a capacitor.

7. The high-voltage connection abnormality detection system for an electric vehicle according to claim 5, characterized in that: The detection module (102) further includes a reference waveform generation submodule (1025) for generating a reference waveform based on the waveform parameters of the original detection waveform; The waveform comparison submodule (1024) includes a subtractor (10241) and a comparator (10242); The first input end of the subtractor (10241) is connected to the output end of the frequency selector (1023), the second input end of the subtractor (10241) is connected to the output end of the reference waveform generation submodule (1025), and the subtractor (10241) is used to output the difference between the target detection waveform and the reference waveform; The first input terminal of the comparator (10242) is connected to the output terminal of the subtractor (10241), and the second input terminal of the comparator (10242) inputs a predetermined voltage threshold. The comparator (10242) is used to compare the difference with the predetermined voltage threshold to determine whether there is a connection abnormality between the voltage source (11) and the power terminal (12).

8. The high-voltage connection abnormality detection system for an electric vehicle according to claim 7, characterized in that: The detection module (102) further includes a filter (1026) and an amplifier (1027); The input end of the filter (1026) is connected to the output end of the frequency selector (1023), and is used to filter the target detection waveform output by the frequency selector (1023); The input end of the amplifier (1027) is connected to the output end of the filter (1026), and the output end of the amplifier (1027) is connected to the first input end of the comparator (10242). The amplifier (1027) is used to amplify the filtered target detection waveform and input the amplified target detection waveform into the comparator through the first input end of the comparator (10242).

9. The high-voltage connection abnormality detection system for an electric vehicle according to claim 1, characterized in that: The detection waveform generation module (101) comprises a first detection waveform generation submodule (111) and a second detection waveform generation submodule (112); The output end of the first detection waveform generating submodule (111) is connected to the negative electrode of the voltage source (11), and is used to couple the negative signal of the original detection waveform to the negative loop of the power transmission network, and transmit it through the power line (13) of the negative loop in the power transmission network; The output end of the second detection waveform generating submodule (112) is connected to the positive electrode of the voltage source (11) and is used to couple the positive signal of the original detection waveform into the positive loop of the electrical transmission network and transmit it through the power line (13) of the positive loop in the electrical transmission network.

10. The high-voltage connection abnormality detection system for an electric vehicle according to claim 9, characterized in that: The detection module (102) includes a first detection submodule (121) and a second detection submodule (122); The input end of the first detection submodule (121) is connected to the negative electrode of the power terminal (12), and is used to identify the negative signal of the target detection waveform corresponding to the negative signal of the original detection waveform from the negative electrode of the power terminal (12), compare the negative signal of the target detection waveform with the negative signal of the original detection waveform, and determine whether there is a connection abnormality in the negative circuit between the voltage source (11) and the power terminal (12); The input end of the second detection submodule (122) is connected to the positive electrode of the power terminal (12), and is used to identify the positive signal of the target detection waveform corresponding to the positive signal of the original detection waveform from the positive electrode of the power terminal (12), compare the positive signal of the target detection waveform with the positive signal of the original detection waveform, and determine whether there is a connection abnormality in the positive circuit between the voltage source (11) and the power terminal (12).

11. The high-voltage connection abnormality detection system for an electric vehicle according to claim 1, characterized in that: The high-voltage connection abnormality detection system for an electric vehicle further comprises a filtering module (103) connected to the input end of the detection module (102) and configured to filter the voltage input to the power terminal (12) after the detection module (102) identifies the target detection waveform.

12. The high-voltage connection abnormality detection system for an electric vehicle according to claim 11, characterized in that: The filtering module (103) is a capacitor.

13. An electric vehicle, characterized in that: A high-voltage connection abnormality detection system for an electric vehicle comprising a voltage source, at least one power terminal, and the system according to any one of claims 1 to 12; The high-voltage connection abnormality detection system for an electric vehicle is used to determine whether there is a connection abnormality between the voltage source and the power terminal.

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