A vehicle-mounted detection system

Abstract

The present application provides a vehicle-mounted detection system, wherein the system includes: a detection device, a DC charging socket, a high-voltage contactor, and a high-voltage busbar; the detection device is connected to the DC charging socket, the high-voltage contactor, and the high-voltage busbar respectively; one end of the high-voltage busbar is connected to the DC charging socket; the high-voltage contactor is arranged on the high-voltage busbar; the detection device is configured to output a square wave voltage signal to the high-voltage busbar when it detects that the DC charging socket is connected to the DC charging gun on the DC charging pile to be detected; collect the back-collection voltage signal on the high-voltage busbar; determine whether the DC charging circuit has an abnormality based on the back-collection voltage signal; if the DC charging circuit has no abnormality, send a closing instruction to the high-voltage contactor; the high-voltage contactor is configured to connect the DC charging socket to the high-voltage battery through the high-voltage busbar when receiving the closing instruction. This solution is conducive to improving the timeliness of DC charging pile detection.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to a vehicle-mounted detection system. Background Art

[0002] When using a DC charging station to charge a vehicle's high-voltage battery, the station's high-voltage system must be directly connected to the vehicle's high-voltage system. If the DC charging station experiences a fault (e.g., component breakdown, aging, short circuit, open circuit, insulation damage, etc.), using the DC charging station to charge the vehicle's high-voltage battery could damage the vehicle. Therefore, DC charging stations must be inspected.

[0003] In the prior art, DC charging piles are typically inspected regularly by their manufacturers, for example, every three months. However, this regular inspection cannot guarantee that the DC charging piles will always be fault-free when used to charge a vehicle. This means that the timeliness of DC charging pile inspections in the prior art is poor, resulting in lower safety during vehicle charging. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a vehicle-mounted detection system to improve the timeliness of DC charging pile detection and improve the safety of vehicle charging.

[0005] In a first aspect, an embodiment of the present application provides an on-vehicle detection system, comprising: a detection device, a DC charging socket, a high-voltage contactor, and a high-voltage busbar; the detection device is connected to the DC charging socket, the high-voltage contactor, and the high-voltage busbar, respectively; one end of the high-voltage busbar is connected to the DC charging socket; and the high-voltage contactor is disposed on the high-voltage busbar;

[0006] The detection device is configured to, upon detecting that the DC charging socket is connected to a DC charging gun on a DC charging pile to be detected, output a square wave voltage signal to the high-voltage bus; collect a back-collection voltage signal on the high-voltage bus; and determine whether an abnormality occurs in the DC charging circuit based on the back-collection voltage signal; and, if no abnormality occurs in the DC charging circuit, send a closing instruction to the high-voltage contactor; wherein the DC charging pile to be detected charges the high-voltage battery via the DC charging circuit;

[0007] The high-voltage contactor is used to connect the DC charging socket and the high-voltage battery through the high-voltage bus when receiving the closing instruction.

[0008] In combination with the first aspect, an embodiment of the present application provides a first possible implementation of the first aspect, wherein the detection device is further used to send a warning signal to the vehicle control system when an abnormality occurs in the DC charging circuit.

[0009] In combination with the first aspect or the first possible implementation manner of the first aspect, the embodiment of the present application provides a second possible implementation manner of the first aspect, wherein the detection device includes: a first detection module and a first control module; the first detection module is respectively connected to the high-voltage bus and the first control module; the first control module is respectively connected to the DC charging socket and the high-voltage contactor;

[0010] The first control module is configured to, upon detecting that the DC charging socket is connected to the DC charging gun, send a first control signal to the first detection module; receive the recovery voltage signal sent by the first detection module, and determine whether an abnormality occurs in the DC charging circuit based on the recovery voltage signal; and, if no abnormality occurs in the DC charging circuit to be charged, send the closing instruction to the high-voltage contactor;

[0011] The first detection module is configured to output the square wave voltage signal to the high-voltage bus upon receiving the first control signal; and to collect the recovery voltage signal on the high-voltage bus and send the recovery voltage signal to the first control module.

[0012] In combination with the first aspect or the first possible implementation manner of the first aspect, the embodiment of the present application provides a third possible implementation manner of the first aspect, wherein the detection device includes: a second detection module and a second control module; the second detection module is respectively connected to the high-voltage bus and the second control module; the second control module is respectively connected to the DC charging socket and the high-voltage contactor;

[0013] The second control module is configured to, upon detecting that the DC charging socket is connected to the DC charging gun, send a second control signal to the second detection module; receive a determination result from the second detection module as to whether an abnormality has occurred in the DC charging circuit; and, if no abnormality has occurred in the DC charging circuit, send the closing instruction to the high-voltage contactor;

[0014] The second detection module is configured to output the square wave voltage signal to the high-voltage bus upon receiving the second control signal; and collect the recovered voltage signal on the high-voltage bus, determine whether an abnormality occurs in the DC charging circuit based on the recovered voltage signal, and send the determination result of whether an abnormality occurs in the DC charging circuit to the second control module.

[0015] In combination with the second possible implementation manner of the first aspect, an embodiment of the present application provides a fourth possible implementation manner of the first aspect, wherein the first detection module includes: a first main control chip, a first sending unit, and a first acquisition unit; the first main control chip is respectively connected to the first sending unit, the first acquisition unit, and the first control module;

[0016] The first main control chip is configured to, upon receiving the first control signal, send a third control signal to the first sending unit and send a fourth control signal to the first acquisition unit; and receive the recovery voltage signal sent by the first acquisition unit and send the recovery voltage signal to the first control module;

[0017] The first sending unit is configured to output the square wave voltage signal to the high-voltage bus upon receiving the third control signal;

[0018] The first acquisition unit is configured to acquire the recovery voltage signal on the high-voltage bus and send the recovery voltage signal to the first main control chip when receiving the fourth control signal.

[0019] In combination with the third possible implementation manner of the first aspect, the embodiment of the present application provides a fifth possible implementation manner of the first aspect, wherein the second detection module includes: a second main control chip, a second sending unit, and a second acquisition unit; the second main control chip is respectively connected to the second sending unit, the second acquisition unit, and the second control module;

[0020] The second main control chip is configured to, upon receiving the second control signal, send a fifth control signal to the second sending unit and a sixth control signal to the second acquisition unit; and receive the recovered voltage signal sent by the second acquisition unit, determine whether an abnormality occurs in the DC charging circuit based on the recovered voltage signal, and send a determination result of whether an abnormality occurs in the DC charging circuit to the second control module;

[0021] The second sending unit is configured to output the square wave voltage signal to the high-voltage bus upon receiving the fifth control signal;

[0022] The second acquisition unit is configured to acquire the recovery voltage signal on the high-voltage bus and send the recovery voltage signal to the second main control chip when receiving the sixth control signal.

[0023] In combination with the fourth possible implementation manner of the first aspect, the embodiment of the present application provides a sixth possible implementation manner of the first aspect, wherein the first sending unit includes: a first transformer controller, a first transformer, a first diode, and a second diode; the high-voltage bus includes a high-voltage positive line and a high-voltage negative line; the input end of the first transformer is connected to the output end of the first transformer controller; the first output end of the first transformer is connected to the anode of the first diode; the second output end of the first transformer is connected to the anode of the second diode; the third output end of the first transformer is connected to the high-voltage negative line; the high-voltage positive line is respectively connected to the cathode of the first diode and the cathode of the second diode; the first transformer controller is connected to a power supply and the first main control chip;

[0024] The first transformer controller is configured to convert the first direct current provided by the power supply into a first alternating current when receiving the third control signal sent by the first main control chip, and transmit the first alternating current to the input end of the first transformer.

[0025] In combination with the sixth possible implementation of the first aspect, the embodiment of the present application provides a seventh possible implementation of the first aspect, wherein the first acquisition unit includes: a first insulating isolation chip, a first analog sampling chip, a first resistor, and a second resistor; the first insulating isolation chip is respectively connected to the first main control chip, the first analog sampling chip, and the power supply; the first end of the first resistor is connected to the first analog sampling chip, and the second end of the first resistor is connected to the high-voltage positive line; the first end of the second resistor is connected to the first end of the first resistor, and the second end of the second resistor is connected to the high-voltage negative line;

[0026] The first insulating isolation chip is configured to, upon receiving the fourth control signal, send a seventh control signal to the first analog sampling chip; transmit the power supply voltage provided by the power supply to the first analog acquisition chip to power the first analog acquisition chip; and send the received sampling voltage signal to the first main control chip;

[0027] The first analog sampling chip is used to collect the sampling voltage signal when receiving the seventh control signal, and send the collected sampling voltage signal to the first insulation isolation chip.

[0028] In combination with the fifth possible implementation of the first aspect, the embodiment of the present application provides an eighth possible implementation of the first aspect, wherein the second sending unit includes: a second transformer controller, a second transformer, a third diode and a fourth diode; the high-voltage bus includes a high-voltage positive line and a high-voltage negative line; the input end of the second transformer is connected to the output end of the second transformer controller; the first output end of the second transformer is connected to the anode of the third diode; the second output end of the first transformer is connected to the anode of the fourth diode; the third output end of the second transformer is connected to the high-voltage negative line; the high-voltage positive line is respectively connected to the cathode of the third diode and the cathode of the fourth diode; the second transformer controller is connected to the power supply and the second main control chip;

[0029] The second transformer controller is configured to convert the second direct current provided by the power supply into a second alternating current when receiving the fifth control signal sent by the second main control chip, and transmit the second alternating current to the input end of the second transformer.

[0030] In combination with the eighth possible implementation of the first aspect, the embodiment of the present application provides a ninth possible implementation of the first aspect, wherein the second acquisition unit includes: a second insulation isolation chip, a second analog sampling chip, a third resistor, and a fourth resistor; the second insulation isolation chip is respectively connected to the second main control chip, the second analog sampling chip, and the power supply; one end of the third resistor is connected to the second analog sampling chip, and the other end of the third resistor is connected to the high-voltage positive line; one end of the fourth resistor is connected to the second analog sampling chip, and the other end of the fourth resistor is connected to the high-voltage negative line;

[0031] The second insulating isolation chip is configured to, upon receiving the sixth control signal, send an eighth control signal to the second analog sampling chip; transmit the power supply voltage provided by the power supply to the second analog sampling chip to power the second analog sampling chip; and send the received sampling voltage signal to the second main control chip;

[0032] The second analog sampling chip is used to collect the sampling voltage signal when receiving the eighth control signal, and send the collected sampling voltage signal to the second insulation isolation chip.

[0033] In combination with the first possible implementation of the first aspect, the embodiment of the present application provides a tenth possible implementation of the first aspect, wherein the detection device, when used to determine whether an abnormality occurs in the DC charging circuit based on the recovered voltage signal, is specifically used to:

[0034] determining whether a target voltage waveform of the recovered voltage signal conforms to a fault voltage waveform or a standard voltage waveform; the fault voltage waveform including: a first fault voltage waveform generated by a breakdown of a target diode and / or a second fault voltage waveform generated by a short circuit between the positive and negative electrodes of the DC charging circuit; the target diode being disposed in the DC charging circuit and configured to prevent current backflow;

[0035] When the target voltage waveform matches any one of the fault voltage waveforms, it is determined that an abnormality occurs in the DC charging circuit;

[0036] When the target voltage waveform meets the standard voltage waveform, it is determined that no abnormality occurs in the DC charging circuit.

[0037] In combination with the tenth possible implementation manner of the first aspect, the embodiment of the present application provides an eleventh possible implementation manner of the first aspect, wherein the standard voltage waveform is that the voltage value of the recovery voltage signal rises from 0 to a target voltage value in a first time period, and the voltage value of the recovery voltage signal continues to remain at the target voltage value in a second time period; the first time period and the second time period are two consecutive time periods, and the first time period is before the second time period;

[0038] The first fault voltage waveform is that the voltage value of the recovery voltage signal increases from 0 to a first voltage value during the first time period and the second time period; the first voltage value is less than the target voltage value;

[0039] The second fault voltage waveform is that the voltage value of the recovery voltage signal increases from 0 to a second voltage value during the first time period and the second time period; the second voltage value is less than the first voltage value.

[0040] The embodiment of the present application provides an on-board detection system. Each time a DC charging pile is used to charge the high-voltage battery on a vehicle, that is, when it is detected that the DC charging socket is connected to the DC charging gun on the DC charging pile to be tested, the detection device in the on-board detection system is used to detect the DC charging circuit. When it is determined that there is no abnormality in the DC charging circuit, the DC charging socket on the vehicle is connected to the high-voltage battery through the high-voltage bus, thereby allowing the DC charging pile to be tested to charge the high-voltage battery. Compared with the prior art of periodically testing DC charging piles, this solution tests the DC charging pile once each time it is used to charge the high-voltage battery on the vehicle, thereby improving the timeliness of DC charging pile testing and thereby improving the safety of vehicle charging.

[0041] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 A schematic structural diagram of a vehicle-mounted detection system provided in an embodiment of the present application is shown;

[0044] Figure 2 A schematic structural diagram of a detection device provided in an embodiment of the present application is shown;

[0045] Figure 3 A schematic structural diagram of a first detection module provided in an embodiment of the present application is shown;

[0046] Figure 4 A schematic structural diagram of another detection device provided in an embodiment of the present application is shown;

[0047] Figure 5 A schematic diagram showing a standard voltage waveform provided by an embodiment of the present application is shown;

[0048] Figure 6 A schematic diagram showing a first fault voltage waveform provided by an embodiment of the present application is shown;

[0049] Figure 7 A schematic diagram of a second fault voltage waveform provided in an embodiment of the present application is shown.

[0050] Icons: detection device 1; DC charging socket 2; high-voltage contactor 3; high-voltage busbar 4; DC charging pile to be detected 5; high-voltage battery 6; first detection module 11; first control module 12; second detection module 13; second control module 14; high-voltage positive line 41; high-voltage negative line 42; DC charging gun 51; first main control chip 111; first transformer controller 112; first transformer 113; first diode 114; second diode 115; first insulation isolation chip 116; first analog sampling chip 117; first resistor 118; second resistor 119. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions 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 only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0052] Taking into account the problem of poor timeliness in detecting DC charging piles in the prior art, based on this, an embodiment of the present application provides a vehicle-mounted detection system, which is described below through an embodiment.

[0053] Example 1:

[0054] To facilitate understanding of this embodiment, a vehicle-mounted detection system disclosed in an embodiment of the present application is first introduced in detail. Figure 1 A schematic diagram of the structure of a vehicle-mounted detection system provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the system includes: a detection device 1, a DC charging socket 2, a high-voltage contactor 3 and a high-voltage busbar 4; the detection device 1 is connected to the DC charging socket 2, the high-voltage contactor 3 and the high-voltage busbar 4 respectively; one end of the high-voltage busbar 4 is connected to the DC charging socket 2; the high-voltage contactor 3 is arranged on the high-voltage busbar 4;

[0055] The detection device 1 is configured to output a square wave voltage signal to the high-voltage bus 4 upon detecting that the DC charging socket 2 is connected to the DC charging gun 51 on the DC charging pile 5 to be detected; collect a back-collection voltage signal on the high-voltage bus 4; determine whether an abnormality has occurred in the DC charging circuit based on the back-collection voltage signal; and, if no abnormality has occurred in the DC charging circuit, send a closing command to the high-voltage contactor 3; wherein the DC charging pile to be detected charges the high-voltage battery via the DC charging circuit;

[0056] The high-voltage contactor 3 is used to connect the DC charging socket 2 and the high-voltage battery 6 via the high-voltage bus 4 when receiving a closing command.

[0057] In a specific embodiment, the vehicle-mounted detection system is applied to a vehicle. When the detection device 1 is used to determine whether an abnormality occurs in the DC charging circuit based on the recovered voltage signal, it can be specifically used to determine whether an abnormality occurs in the DC charging circuit based on the target voltage waveform of the recovered voltage signal; wherein, the target voltage waveform of the recovered voltage signal can be a curve showing the voltage on the high-voltage bus changing over time. It is also possible to determine whether an abnormality occurs in the DC charging circuit based on the amplitude of the recovered voltage signal. The initial state of the high-voltage contactor 3 can be a disconnected state.

[0058] In this embodiment, the DC charging circuit includes a high-voltage bus 4 in the vehicle and a high-voltage circuit in a DC charging pile 5 to be tested.

[0059] The high-voltage contactor 3 is used to close when receiving a closing command, thereby connecting the DC charging socket 2 and the high-voltage battery 6 through the high-voltage bus 4, so that the DC charging pile 5 to be tested can charge the high-voltage battery 6.

[0060] In a possible implementation, the detection device 1 is further configured to send a warning signal to the vehicle control system when an abnormality occurs in the DC charging circuit.

[0061] In a specific embodiment, the abnormality in the DC charging circuit may be that a target diode in the DC charging pile 5 to be detected is broken down, or that the positive and negative poles of the DC charging circuit are short-circuited.

[0062] In the event of an abnormality in the DC charging circuit, the high-voltage contactor 3 is in a disconnected state, so that the DC charging pile 5 to be detected stops charging the high-voltage battery 6 .

[0063] In this solution, when an abnormality occurs in the DC charging circuit, an early warning signal is sent to the vehicle control system to remind the owner of the vehicle that the DC charging pile 5 to be detected is faulty, so that the owner can replace it with another DC charging pile to charge the vehicle.

[0064] In one possible implementation, Figure 2 A schematic diagram of the structure of a detection device provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the detection device 1 includes: a first detection module 11 and a first control module 12; the first detection module 11 is connected to the high-voltage bus 4 and the first control module 12 respectively; the first control module 12 is connected to the DC charging socket 2 and the high-voltage contactor 3 respectively;

[0065] The first control module 12 is configured to send a first control signal to the first detection module 11 upon detecting that the DC charging socket 2 is connected to the DC charging gun 51; receive the recovery voltage signal sent by the first detection module 11, and determine whether an abnormality occurs in the DC charging circuit based on the recovery voltage signal; and send a closing instruction to the high-voltage contactor 3 if no abnormality occurs in the DC charging circuit;

[0066] The first detection module 11 is configured to output a square wave voltage signal to the high-voltage bus 4 upon receiving a first control signal; and to collect a recovery voltage signal on the high-voltage bus 4 and send the recovery voltage signal to the first control module 12 .

[0067] In one possible implementation, Figure 3 FIG. 1 shows a schematic diagram of the structure of the first detection module provided in an embodiment of the present application. Figure 3 As shown, the first detection module 11 includes: a first main control chip 111, a first sending unit and a first acquisition unit; the first main control chip 111 is connected to the first sending unit, the first acquisition unit and the first control module 12 respectively;

[0068] The first main control chip 111 is configured to, upon receiving the first control signal, send a third control signal to the first sending unit and send a fourth control signal to the first acquisition unit; and receive the recovered voltage signal sent by the first acquisition unit and send the recovered voltage signal to the first control module 12;

[0069] The first sending unit is configured to output a square wave voltage signal to the high-voltage bus 4 upon receiving the third control signal;

[0070] The first acquisition unit is configured to acquire the recovered voltage signal on the high-voltage bus 4 and send the recovered voltage signal to the first main control chip 111 upon receiving the fourth control signal.

[0071] In one possible implementation, Figure 3 As shown, the first sending unit includes: a first transformer controller 112, a first transformer 113, a first diode 114 and a second diode 115; the high-voltage bus 4 includes a high-voltage positive line 41 and a high-voltage negative line 42; the input end of the first transformer 113 is connected to the output end of the first transformer controller 112; the first output end of the first transformer 113 is connected to the anode of the first diode 114; the second output end of the first transformer 113 is connected to the anode of the second diode 115; the third output end of the first transformer 113 is connected to the high-voltage negative line 42; the high-voltage positive line 41 is respectively connected to the cathode of the first diode 114 and the cathode of the second diode 115; the first transformer controller 112 is connected to the power supply 7 and the first main control chip 111;

[0072] The first transformer controller 112 is configured to convert the first direct current provided by the power supply 7 into a first alternating current when receiving the third control signal sent by the first main control chip 111 , and transmit the first alternating current to the input end of the first transformer 113 .

[0073] In a specific embodiment, the power supply 7 may be at a level within the vehicle, and the voltage provided by the power supply 7 may be 12 V. The first transformer 113 is configured to boost the first alternating current into a first high-voltage alternating current.

[0074] In one possible implementation, Figure 3 As shown, the first acquisition unit includes: a first insulating isolation chip 116, a first analog sampling chip 117, a first resistor 118 and a second resistor 119; the first insulating isolation chip 116 is connected to the first main control chip 111, the first analog sampling chip 117 and the power supply 7 respectively; a first end of the first resistor 118 is connected to the first analog sampling chip 117, and a second end of the first resistor 118 is connected to the high-voltage positive line 41; a first end of the second resistor 119 is connected to the first end of the first resistor 118, and a second end of the second resistor 119 is connected to the high-voltage negative line 42;

[0075] The first insulating isolation chip 116 is configured to send a seventh control signal to the first analog sampling chip 117 upon receiving the fourth control signal; transmit the power supply voltage provided by the power supply 7 to the first analog acquisition chip 117 to power the first analog acquisition chip 117; and send the received sampling voltage signal to the first main control chip 111;

[0076] The first analog sampling chip 117 is used to collect the sampling voltage signal when receiving the seventh control signal, and send the collected sampling voltage signal to the first insulation isolation chip 116.

[0077] Among them, the first resistor 118 and the second resistor 119 are both used for voltage division. Specifically, since the voltage on the high-voltage positive line 41 and the high-voltage negative line 42 is a high voltage, and the operating voltage of the first analog sampling chip 117 is a low voltage, it is necessary to connect the first resistor 118 and the second resistor 119 between the first analog sampling chip 117 and the high-voltage bus 4 for voltage division, thereby reducing the voltage value of the voltage received by the first analog sampling chip 117.

[0078] The first insulating isolation chip 116 is used to separate the first main control chip 111 from the high-voltage area (including the first analog sampling chip 117 and the high-voltage bus 4 ), thereby protecting the first main control chip 111 .

[0079] In another possible implementation, Figure 4FIG. 1 shows a schematic structural diagram of another detection device provided in an embodiment of the present application. Figure 4 As shown, the detection device 1 includes: a second detection module 13 and a second control module 14; the second detection module 13 is respectively connected to the high-voltage bus 4 and the second control module 14; the second control module 14 is respectively connected to the DC charging socket 2 and the high-voltage contactor 3;

[0080] The second control module 14 is configured to send a second control signal to the second detection module 13 upon detecting that the DC charging socket 2 is connected to the DC charging gun 51; receive a determination result from the second detection module 13 as to whether an abnormality has occurred in the DC charging circuit; and send a closing instruction to the high-voltage contactor 3 if no abnormality has occurred in the DC charging circuit;

[0081] The second detection module 13 is used to output a square wave voltage signal to the high-voltage bus 4 when receiving the second control signal; and to collect the recovery voltage signal on the high-voltage bus 4, determine whether the DC charging circuit is abnormal based on the recovery voltage signal, and send the judgment result of whether the DC charging circuit is abnormal to the second control module 14.

[0082] In a possible implementation, the second detection module 13 includes: a second main control chip, a second sending unit, and a second acquisition unit; the second main control chip is connected to the second sending unit, the second acquisition unit, and the second control module 14 respectively;

[0083] The second main control chip is configured to, upon receiving the second control signal, send a fifth control signal to the second sending unit and a sixth control signal to the second acquisition unit; and receive the recovered voltage signal sent by the second acquisition unit, determine whether an abnormality occurs in the DC charging circuit based on the recovered voltage signal, and send a determination result of whether an abnormality occurs in the DC charging circuit to the second control module 14;

[0084] The second sending unit is configured to output a square wave voltage signal to the high-voltage bus 4 upon receiving the fifth control signal;

[0085] The second acquisition unit is used to acquire the recovery voltage signal on the high-voltage bus 4 when receiving the sixth control signal, and send the recovery voltage signal to the second main control chip.

[0086] In one possible embodiment, the second sending unit includes: a second transformer controller, a second transformer, a third diode, and a fourth diode; the high-voltage bus 4 includes a high-voltage positive line 41 and a high-voltage negative line 42; the input end of the second transformer is connected to the output end of the second transformer controller; the first output end of the second transformer is connected to the anode of the third diode; the second output end of the first transformer is connected to the anode of the fourth diode; the third output end of the second transformer is connected to the high-voltage negative line 42; the high-voltage positive line 41 is respectively connected to the cathode of the third diode and the cathode of the fourth diode; the second transformer controller is connected to the power supply 7 and the second main control chip;

[0087] The second transformer controller is configured to convert the second direct current provided by the power supply 7 into a second alternating current when receiving the fifth control signal sent by the second main control chip, and transmit the second alternating current to the input end of the second transformer.

[0088] In one possible embodiment, the second acquisition unit includes: a second insulation isolation chip, a second analog sampling chip, a third resistor and a fourth resistor; the second insulation isolation chip is respectively connected to the second main control chip, the second analog sampling chip and the power supply 7; one end of the third resistor is connected to the second analog sampling chip, and the other end of the third resistor is connected to the high-voltage positive line 41; one end of the fourth resistor is connected to the second analog sampling chip, and the other end of the fourth resistor is connected to the high-voltage negative line 42;

[0089] The second insulating isolation chip is configured to send an eighth control signal to the second analog sampling chip upon receiving the sixth control signal; transmit the power supply voltage provided by the power supply 7 to the second analog sampling chip to power the second analog sampling chip; and send the received sampling voltage signal to the second main control chip;

[0090] The second analog sampling chip is used to collect the sampling voltage signal when receiving the eighth control signal, and send the collected sampling voltage signal to the second insulation isolation chip.

[0091] In a possible implementation, when the detection device 1 is used to determine whether an abnormality occurs in the DC charging circuit based on the recovered voltage signal, it is specifically used to:

[0092] Determine whether the target voltage waveform of the recovered voltage signal conforms to the fault voltage waveform or the standard voltage waveform; the fault voltage waveform includes: a first fault voltage waveform caused by the breakdown of the target diode, and / or a second fault voltage waveform caused by a short circuit between the positive and negative poles of the DC charging circuit; the target diode is provided in the DC charging pile 5 to be tested, and the target diode is used to prevent current backflow;

[0093] When the target voltage waveform matches any one of the fault voltage waveforms, it is determined that the DC charging circuit is abnormal;

[0094] When the target voltage waveform meets the standard voltage waveform, it is determined that the DC charging circuit has no abnormality.

[0095] In this embodiment, when the DC charging pile 5 to be tested is charging the vehicle to be charged, under normal circumstances, the direction of current flow is from the DC charging pile 5 to be tested to the vehicle to be charged, wherein the role of the target diode in the DC charging pile 5 to be tested is specifically to prevent the current from flowing from the direction of the vehicle to the direction of the DC charging pile 5 to be tested during the charging process, that is, to prevent current backflow.

[0096] In one possible implementation, Figure 5 A schematic diagram of a standard voltage waveform provided by an embodiment of the present application is shown in FIG. Figure 5 As shown, the standard voltage waveform is that the voltage value of the recovered voltage signal rises from 0 to the target voltage value in the first time period, and the voltage value of the recovered voltage signal continues to remain at the target voltage value in the second time period; the first time period and the second time period are two consecutive time periods, and the first time period is before the second time period.

[0097] Figure 6 FIG. 1 shows a schematic diagram of a first fault voltage waveform provided by an embodiment of the present application, as shown in FIG. Figure 6 As shown, the first fault voltage waveform is that the voltage value of the recovered voltage signal rises from 0 to a first voltage value in the first time period and the second time period; the first voltage value is less than the target voltage value.

[0098] Figure 7 FIG. 1 shows a schematic diagram of a second fault voltage waveform provided by an embodiment of the present application, such as Figure 7 As shown, the second fault voltage waveform shows that the voltage value of the recovery voltage signal increases from 0 to a second voltage value during the first time period and the second time period; the second voltage value is less than the first voltage value. It should be noted that similar reference numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0099] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0100] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0101] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection of the claims.

Claims

1. A vehicle-mounted detection system, characterized in that: The system includes: a detection device, a DC charging socket, a high-voltage contactor, and a high-voltage busbar; the detection device is connected to the DC charging socket, the high-voltage contactor, and the high-voltage busbar respectively; one end of the high-voltage busbar is connected to the DC charging socket; the high-voltage contactor is arranged on the high-voltage busbar; The detection device is configured to, upon detecting that the DC charging socket is connected to a DC charging gun on a DC charging pile to be detected, output a square wave voltage signal to the high-voltage bus; collect a back-collection voltage signal on the high-voltage bus; and determine whether an abnormality occurs in the DC charging circuit based on the back-collection voltage signal; and, if no abnormality occurs in the DC charging circuit, send a closing instruction to the high-voltage contactor; wherein the DC charging pile to be detected charges the high-voltage battery via the DC charging circuit; The high-voltage contactor is configured to connect the DC charging socket and the high-voltage battery via the high-voltage busbar upon receiving the closing instruction; The detection device includes: a first detection module and a first control module; the first detection module is respectively connected to the high-voltage bus and the first control module; the first control module is respectively connected to the DC charging socket and the high-voltage contactor; The first control module is configured to, upon detecting that the DC charging socket is connected to the DC charging gun, send a first control signal to the first detection module; receive the recovery voltage signal sent by the first detection module, and determine whether an abnormality occurs in the DC charging circuit based on the recovery voltage signal; and, if no abnormality occurs in the DC charging circuit, send the closing instruction to the high-voltage contactor; The first detection module is configured to output the square wave voltage signal to the high-voltage bus upon receiving the first control signal; and collect the recovery voltage signal on the high-voltage bus and send the recovery voltage signal to the first control module; The first detection module includes: a first main control chip, a first sending unit and a first acquisition unit; the first main control chip is connected to the first sending unit, the first acquisition unit and the first control module respectively; The first main control chip is configured to, upon receiving the first control signal, send a third control signal to the first sending unit and send a fourth control signal to the first acquisition unit; and receive the recovery voltage signal sent by the first acquisition unit and send the recovery voltage signal to the first control module; The first sending unit is configured to output the square wave voltage signal to the high-voltage bus upon receiving the third control signal; The first acquisition unit is configured to acquire the recovery voltage signal on the high-voltage bus upon receiving the fourth control signal, and send the recovery voltage signal to the first main control chip; The first sending unit includes: a first transformer controller, a first transformer, a first diode, and a second diode; the high-voltage bus includes a high-voltage positive line and a high-voltage negative line; the input end of the first transformer is connected to the output end of the first transformer controller; the first output end of the first transformer is connected to the anode of the first diode; the second output end of the first transformer is connected to the anode of the second diode; the third output end of the first transformer is connected to the high-voltage negative line; the high-voltage positive line is respectively connected to the cathode of the first diode and the cathode of the second diode; the first transformer controller is connected to a power supply and the first main control chip; the first transformer controller is configured to, upon receiving the third control signal sent by the first main control chip, convert the first direct current provided by the power supply into a first alternating current, and transmit the first alternating current to an input end of the first transformer; The first transformer is used to boost the first alternating current into a first high-voltage alternating current; or, The detection device includes: a second detection module and a second control module; the second detection module is respectively connected to the high-voltage bus and the second control module; the second control module is respectively connected to the DC charging socket and the high-voltage contactor; The second control module is configured to, upon detecting that the DC charging socket is connected to the DC charging gun, send a second control signal to the second detection module; receive a determination result from the second detection module as to whether an abnormality has occurred in the DC charging circuit; and, if no abnormality has occurred in the DC charging circuit, send the closing instruction to the high-voltage contactor; The second detection module is configured to output the square wave voltage signal to the high-voltage bus upon receiving the second control signal; and collect the back-collecting voltage signal on the high-voltage bus, determine whether the DC charging circuit has an abnormality based on the back-collecting voltage signal, and send the determination result of whether the DC charging circuit has an abnormality to the second control module; The second detection module includes: a second main control chip, a second sending unit and a second acquisition unit; the second main control chip is connected to the second sending unit, the second acquisition unit and the second control module respectively; The second main control chip is configured to, upon receiving the second control signal, send a fifth control signal to the second sending unit and a sixth control signal to the second acquisition unit; and receive the recovered voltage signal sent by the second acquisition unit, determine whether an abnormality occurs in the DC charging circuit based on the recovered voltage signal, and send a determination result of whether an abnormality occurs in the DC charging circuit to the second control module; The second sending unit is configured to output the square wave voltage signal to the high-voltage bus upon receiving the fifth control signal; The second acquisition unit is configured to acquire the recovery voltage signal on the high-voltage bus and send the recovery voltage signal to the second main control chip upon receiving the sixth control signal; The second sending unit includes: a second transformer controller, a second transformer, a third diode and a fourth diode; the high-voltage bus includes a high-voltage positive line and a high-voltage negative line; the input end of the second transformer is connected to the output end of the second transformer controller; the first output end of the second transformer is connected to the anode of the third diode; the second output end of the first transformer is connected to the anode of the fourth diode; the third output end of the second transformer is connected to the high-voltage negative line; the high-voltage positive line is respectively connected to the cathode of the third diode and the cathode of the fourth diode; the second transformer controller is connected to the power supply and the second main control chip; The second transformer controller is configured to convert the second direct current provided by the power supply into a second alternating current when receiving the fifth control signal sent by the second main control chip, and transmit the second alternating current to the input end of the second transformer.

2. The vehicle-mounted detection system according to claim 1, characterized in that: The detection device is further configured to send an early warning signal to the vehicle control system when an abnormality occurs in the DC charging circuit.

3. The vehicle-mounted detection system according to claim 1, characterized in that: The first acquisition unit includes: a first insulation isolation chip, a first analog sampling chip, a first resistor and a second resistor; the first insulation isolation chip is connected to the first main control chip, the first analog sampling chip and the power supply respectively; a first end of the first resistor is connected to the first analog sampling chip, and a second end of the first resistor is connected to the high-voltage positive line; a first end of the second resistor is connected to the first end of the first resistor, and a second end of the second resistor is connected to the high-voltage negative line; The first insulating isolation chip is configured to, upon receiving the fourth control signal, send a seventh control signal to the first analog sampling chip; transmit the power supply voltage provided by the power supply to the first analog acquisition chip to power the first analog acquisition chip; and send the received sampling voltage signal to the first main control chip; The first analog sampling chip is used to collect the sampling voltage signal when receiving the seventh control signal, and send the collected sampling voltage signal to the first insulation isolation chip.

4. The vehicle-mounted detection system according to claim 1, characterized in that: The second acquisition unit includes: a second insulation isolation chip, a second analog sampling chip, a third resistor and a fourth resistor; the second insulation isolation chip is connected to the second main control chip, the second analog sampling chip and the power supply respectively; one end of the third resistor is connected to the second analog sampling chip, and the other end of the third resistor is connected to the high-voltage positive line; one end of the fourth resistor is connected to the second analog sampling chip, and the other end of the fourth resistor is connected to the high-voltage negative line; The second insulating isolation chip is configured to, upon receiving the sixth control signal, send an eighth control signal to the second analog sampling chip; transmit the power supply voltage provided by the power supply to the second analog sampling chip to power the second analog sampling chip; and send the received sampling voltage signal to the second main control chip; The second analog sampling chip is used to collect the sampling voltage signal when receiving the eighth control signal, and send the collected sampling voltage signal to the second insulation isolation chip.

5. The vehicle-mounted detection system according to claim 1, characterized in that: When the detection device is used to determine whether an abnormality occurs in the DC charging circuit based on the recovered voltage signal, it is specifically used to: determining whether a target voltage waveform of the recovered voltage signal conforms to a fault voltage waveform or a standard voltage waveform; the fault voltage waveform including: a first fault voltage waveform generated by a breakdown of a target diode and / or a second fault voltage waveform generated by a short circuit between the positive and negative electrodes of the DC charging circuit; the target diode being disposed in the DC charging circuit and configured to prevent current backflow; When the target voltage waveform meets any one of the fault voltage waveforms, it is determined that the DC charging circuit is abnormal; when the target voltage waveform meets the standard voltage waveform, it is determined that the DC charging circuit is not abnormal.

6. The vehicle-mounted detection system according to claim 5, characterized in that: The standard voltage waveform is that the voltage value of the recovery voltage signal rises from 0 to a target voltage value in a first time period, and the voltage value of the recovery voltage signal continues to remain at the target voltage value in a second time period; the first time period and the second time period are two consecutive time periods, and the first time period is before the second time period; The first fault voltage waveform is that the voltage value of the recovery voltage signal increases from 0 to a first voltage value during the first time period and the second time period; The first voltage value is less than the target voltage value; The second fault voltage waveform is that the voltage value of the recovery voltage signal increases from 0 to a second voltage value during the first time period and the second time period; The second voltage value is smaller than the first voltage value.

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