Current abnormity monitoring device, monitoring method and vehicle

Abstract

The invention discloses a current abnormity monitoring device, a current abnormity monitoring method and a vehicle. The current abnormity monitoring device comprises a fluxgate current sensor which sleeves a power supply module and is used for monitoring a current signal output by the power supply module; the current and voltage conversion resistor is connected with the output end of the fluxgate current sensor, and the current and voltage conversion resistor is used for converting the current signal into a voltage signal; the voltage comparison module is connected with the current-voltage conversion resistor in parallel, and the voltage comparison module is used for outputting an abnormal alarm signal when the voltage signal is greater than a preset voltage threshold value; the abnormal current alarm module is connected with the voltage comparison module and is used for outputting abnormal current information in response to the abnormal alarm signal; and the fault recording module is used for storing abnormal current information. According to the invention, the resolution of current monitoring and the accuracy of a current monitoring result are improved, and the traceability of the current direction of the abnormal current is ensured, so that the reliability of fault information analysis of the vehicle is improved.

Description

Technical Field

[0001] The present application relates to the technical field of current monitoring, and in particular to a current anomaly monitoring device, a monitoring method and a vehicle. Background Art

[0002] New energy vehicles are a new generation of cars that use non-traditional fuels, advanced power systems and drive technologies. The development of new energy vehicles helps reduce greenhouse gas emissions, respond to climate change and achieve sustainable development. Therefore, they have the characteristics of energy saving, environmental protection and low carbon. With the advancement of technology and policy support, the new energy vehicle industry will continue to develop and play an increasingly important role in future transportation.

[0003] With the popularization of new energy vehicles, it is necessary to pay attention to the safety of the charging process of new energy vehicles. During the charging process of new energy vehicles, if a short-term abnormally large current occurs, it may cause a series of problems, such as charging relay adhesion, unexpected disconnection of the main fuse, etc.; these problems will cause the current monitoring resolution of the charging current of new energy vehicles to be low, making it difficult to monitor the peak current, resulting in poor performance in capturing abnormal currents; there are also problems with large zero drift and temperature drift of the charging current, resulting in low accuracy of the current monitoring results of the charging current of new energy vehicles. In addition, the CAN signals emitted by the abnormal current monitoring devices of most new energy vehicles are not traceable, and it is impossible to analyze the abnormal current information, and thus it is impossible to analyze the vehicle's fault information. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a current anomaly monitoring device, a detection method and a vehicle, which are conducive to improving the resolution of current monitoring and the accuracy of current monitoring results, while ensuring the traceability of the current direction of abnormal current to improve the reliability of fault information analysis of the vehicle.

[0005] In a first aspect, an embodiment of the present application provides a current anomaly monitoring device, comprising:

[0006] A fluxgate current sensor is mounted on the power module, and is used to monitor the current signal output by the power module;

[0007] A current-to-voltage conversion resistor connected to the output end of the fluxgate current sensor, the current-to-voltage conversion resistor being used to convert the current signal into a voltage signal;

[0008] A voltage comparison module is connected in parallel with the current-to-voltage conversion resistor, and the voltage comparison module is used to output an abnormal alarm signal when the voltage signal is greater than a preset voltage threshold;

[0009] An abnormal current alarm module, connected to the voltage comparison module, the abnormal current alarm is used to output abnormal current information in response to the abnormal alarm signal;

[0010] A fault recording module is connected to the abnormal current alarm module and is used to store the abnormal current information.

[0011] According to some embodiments of the present application, it further includes: a D trigger, which is connected to the output end of the voltage comparison module, and the D trigger is used to latch a peak voltage signal converted from a peak current and greater than a preset voltage threshold.

[0012] According to some embodiments of the present application, the abnormal current information includes the abnormal current occurrence time, the abnormal current duration and the current direction of the abnormal current.

[0013] According to some embodiments of the present application, the current direction of the abnormal current is from the power module to the charger end, or the current direction of the abnormal current is from the charger end to the power module.

[0014] According to some embodiments of the present application, the fluxgate current sensor includes an electromagnetic coil and a self-excited oscillator, the electromagnetic coil includes an excitation winding and an iron core, the self-excited oscillator is connected to the excitation winding, and the self-excited oscillator is used to generate a sinusoidal wave signal.

[0015] According to some embodiments of the present application, the fluxgate current sensor also includes a peak detector, which is connected to the excitation winding, and the peak detector is used to generate a square wave signal, and the square wave signal is used to act on the excitation winding and generate a reverse magnetic flux in the iron core.

[0016] According to some embodiments of the present application, the fluxgate current sensor further includes a feedback module and an integral filter, the input end of the feedback module is connected to the excitation winding, and the output end of the feedback module is connected to the input end of the integral filter.

[0017] According to some embodiments of the present application, the fluxgate current sensor also includes a PI control module, an input end of the PI control module is connected to the output end of the integral filter, and an output end of the PI control module is connected to the excitation winding; the product of the current output by the output end of the PI control module and the coil turns ratio of the excitation winding is the current output by the power supply module.

[0018] According to some embodiments of the present application, a voltage dividing module is further included, wherein the voltage dividing module includes a first resistor and a second resistor, and the first resistor and the second resistor are connected in series.

[0019] According to some embodiments of the present application, a host computer is further included, wherein the host computer is communicatively connected to the fault recording module, and the host computer is used to display or retrieve the abnormal current information.

[0020] In a second aspect, an embodiment of the present application provides a current anomaly monitoring method, which is applied to the current anomaly monitoring device as described in the technical solution of the first aspect above, comprising:

[0021] Obtain and monitor the current signal output by the power module;

[0022] Converting the current signal into a voltage signal;

[0023] When the voltage signal is greater than a preset voltage threshold, an abnormal alarm signal is output;

[0024] In response to the abnormal alarm signal, output abnormal current information;

[0025] The abnormal current information is stored.

[0026] According to some embodiments of the present application, the abnormal current monitoring device further includes a host computer, the host computer is communicatively connected to the fault recording module, and the method further includes:

[0027] In response to the fault reading signal, the abnormal current information is displayed or retrieved according to the fault reading signal, wherein the abnormal current information includes the abnormal current occurrence time, the abnormal current duration and the current direction of the abnormal current.

[0028] In a third aspect, an embodiment of the present application provides a vehicle, comprising the current anomaly monitoring device described in the technical solution of the first aspect above.

[0029] A current anomaly monitoring device, a detection method and a vehicle provided by the embodiments of the present application have at least one of the following advantages or beneficial effects: by using a fluxgate current sensor as a current monitoring tool of the current anomaly monitoring device to replace the Hall sensor commonly used in current new energy vehicles, the resolution of current monitoring and the accuracy of current monitoring results can be improved, and the fault current of the current anomaly monitoring device can be accurately monitored; the current-voltage conversion resistor is used to convert the current signal into a voltage signal; the voltage comparison module compares the voltage signal with a preset voltage threshold, and when the voltage signal is greater than the preset voltage threshold, outputs an abnormal alarm signal to remind the user or the current anomaly monitoring device that an abnormal situation exists, and the abnormal current alarm module outputs abnormal current information, and the monitoring personnel can confirm the traceability of the current direction of the abnormal current based on the abnormal current information, and perform fault analysis on the vehicle based on the current direction of the abnormal current, thereby improving the reliability of the fault information analysis of the vehicle, and the fault recording module stores the abnormal current information to provide historical data for the fault analysis and processing of the current anomaly monitoring device, thereby further improving the reliability of the fault information analysis of the vehicle.

[0030] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a structural schematic diagram of a current anomaly monitoring device provided in an embodiment of the present application;

[0032] Figure 2 is a structural schematic diagram of another current anomaly monitoring device provided in an embodiment of the present application;

[0033] Figure 3 is a structural schematic diagram of a fluxgate current sensor provided in an embodiment of the present application;

[0034] Figure 4 A schematic structural diagram of a fluxgate current sensor provided by another embodiment of the present application;

[0035] Figure 5 It is a structural schematic diagram of a current anomaly monitoring method provided in an embodiment of the present application;

[0036] Figure 6 It is a structural schematic diagram of a controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] This section will describe in detail the specific embodiments of the present application. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0038] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "any one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of the first and the second, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0039] It should be noted that the new energy vehicles set, installed, and used in the embodiments of the present application are new generation vehicles that use non-traditional fuels, advanced power systems, and drive technologies. The development of new energy vehicles helps reduce greenhouse gas emissions, respond to climate change, and achieve sustainable development. Therefore, they have the characteristics of energy saving, environmental protection, and low carbon. With the advancement of technology and the support of policies, the new energy vehicle industry will continue to develop and play an increasingly important role in future transportation.

[0040] With the popularization of new energy vehicles, it is necessary to pay attention to the safety of the charging process of new energy vehicles. During the charging process of new energy vehicles, if a short-term abnormally large current occurs, it may cause a series of problems, such as charging relay adhesion, unexpected disconnection of the main fuse, etc.; these problems will cause the current monitoring resolution of the charging current of new energy vehicles to be low, making it difficult to monitor the peak current, resulting in poor performance in capturing abnormal currents; there are also problems with large zero drift and temperature drift of the charging current, resulting in low accuracy of the current monitoring results of the charging current of new energy vehicles. In addition, the CAN signals emitted by the abnormal current monitoring devices of most new energy vehicles are not traceable, and it is impossible to analyze the abnormal current information, and thus it is impossible to analyze the vehicle's fault information.

[0041] The words "connection" and "connection" should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the embodiments of the present application in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection or an indirect connection through an intermediate medium.

[0042] It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0043] Based on this, the embodiments of the present application provide a current anomaly monitoring device, a detection method and a vehicle, which are conducive to improving the resolution of current monitoring and the accuracy of current monitoring results, while ensuring the traceability of the current direction of the abnormal current to improve the reliability of the vehicle's fault information analysis.

[0044] Please refer to the accompanying drawings below to further explain a current anomaly monitoring device, a detection method and a vehicle provided in an embodiment of the present application.

[0045] Reference Figure 1 As shown, Figure 1 It is a structural schematic diagram of a current anomaly monitoring device provided in an embodiment of the present application, wherein the current anomaly monitoring device includes a fluxgate current sensor, a current-voltage conversion resistor, a voltage comparison module, an abnormal current alarm module and a fault recording module; wherein the fluxgate current sensor is mounted on the power module, and the fluxgate current sensor is used to monitor the current signal output by the power module; the current-voltage conversion resistor is connected to the output end of the fluxgate current sensor, and the current-voltage conversion resistor is used to convert the current signal into a voltage signal; the voltage comparison module is connected in parallel with the current-voltage conversion resistor, and the voltage comparison module is used to output an abnormal alarm signal when the voltage signal is greater than a preset voltage threshold; the abnormal current alarm module is connected to the voltage comparison module, and the abnormal current alarm is used to respond to the abnormal alarm signal and output abnormal current information; the fault recording module is connected to the abnormal current alarm module, and is used to store abnormal current information.

[0046] In some embodiments of the present application, the current anomaly monitoring device includes a fluxgate current sensor, which is mounted on a power module, the power module includes a power battery or a battery pack circuit breaker unit, the fluxgate current sensor is mounted on the negative copper bus of the power battery or the battery pack circuit breaker unit, and the fluxgate current sensor is used to monitor the current signal output by the negative copper bus of the power battery or the battery pack circuit breaker unit; the fluxgate current sensor has high sensitivity and stability, and can monitor the current signal output by the power module. The fluxgate current sensor detects the current output by the power module by measuring the change of the magnetic field, has good dynamic characteristics and a wide temperature range, and avoids the problem of zero drift. The current-voltage conversion resistor is connected to the output end of the fluxgate current sensor, and the current-voltage conversion resistor converts the current signal into a voltage signal, and the converted voltage signal can be further processed by the subsequent voltage comparison module. The voltage comparison module is connected in parallel with the current-voltage conversion resistor, and the voltage comparison module is used to compare the size of the voltage signal with the preset voltage threshold. When the detected voltage signal exceeds the preset voltage threshold, the voltage comparison module outputs an abnormal alarm signal. The abnormal current alarm module is connected to the voltage comparison module. The abnormal current alarm module responds to the abnormal alarm signal of the voltage comparison module and outputs abnormal current information to remind the user or the abnormal current monitoring device of abnormal conditions. The fault recording module is connected to the abnormal current alarm module. The fault recording module is used to store abnormal current information to facilitate fault analysis and processing of the abnormal current monitoring device.

[0047] The embodiment of the present application adopts a high-precision, large-measurement-bandwidth fluxgate current sensor as a current monitoring tool for a current anomaly monitoring device, replacing the Hall sensor commonly used in current new energy vehicles. This can improve the resolution of current monitoring and the accuracy of current monitoring results, and accurately monitor the fault current of the current anomaly monitoring device. The voltage comparison module compares the voltage signal converted by the current-voltage conversion resistor with a preset voltage threshold, and when the voltage signal is greater than the preset voltage threshold, outputs an abnormal alarm signal to remind the user or the current anomaly monitoring device that an abnormal situation exists. The abnormal current alarm module outputs abnormal current information, and the monitoring personnel can confirm the traceability of the current direction of the abnormal current based on the abnormal current information, and perform fault analysis on the vehicle based on the current direction of the abnormal current, thereby improving the reliability of the fault information analysis of the vehicle. The fault recording module stores the abnormal current information to provide historical data for the fault analysis and processing of the current anomaly monitoring device, thereby further improving the reliability of the fault information analysis of the vehicle.

[0048] It should be noted that in some embodiments of the present application, the preset voltage threshold is set according to the range of the current output by the power module and the input parameters of the voltage comparison module, and the embodiments of the present application do not limit the preset voltage threshold.

[0049] It should be noted that in some embodiments of the present application, the fault recording module is a non-volatile memory. By using a non-volatile memory as a fault recording module, the abnormal current information data can be kept from being lost after a power outage, so as to provide historical data for fault analysis and processing of the current anomaly monitoring device, thereby further improving the reliability of the vehicle's fault information analysis.

[0050] It should be noted that in some embodiments of the present application, the preset voltage threshold is 6V. Those skilled in the art set the size of the preset voltage threshold according to actual conditions. The embodiments of the present application do not limit the size of the preset voltage threshold.

[0051] In some embodiments of the present application, the resistance of the current-to-voltage conversion resistor is determined based on the current range detected by the fluxgate current sensor and the input parameters of the voltage comparison module, and the resistance tolerance of the current-to-voltage conversion resistor is no more than ±1%; the current-to-voltage conversion resistor is arranged close to the voltage comparison module to reduce electromagnetic interference.

[0052] Reference Figure 2 As shown, Figure 2 This is a structural schematic diagram of another current anomaly monitoring device provided in an embodiment of the present application. In some embodiments of the present application, the current anomaly monitoring device also includes: a D trigger, the D trigger is connected to the output end of the voltage comparison module, and the D trigger is used to latch a peak voltage signal converted from a peak current that is greater than a preset voltage threshold.

[0053] The D flip-flop is connected to the output end of the voltage comparison module. The function of the D flip-flop is to latch the peak voltage signal converted from the peak current that is greater than the preset voltage threshold. It can be understood that the D flip-flop is used to store the peak voltage signal output by the voltage comparison module. When the voltage comparison module detects that the voltage signal exceeds the preset threshold, the D flip-flop latches the peak voltage signal at the output end of the voltage comparison module until the next clock signal arrives, so that the abnormal current alarm module connected to the output end of the D flip-flop responds according to the peak voltage signal.

[0054] In addition, the D flip-flop is usually triggered at the edge (rising or falling edge) of the clock signal, which means that the D flip-flop will only update its output state when the clock signal changes. The edge-triggered characteristic helps to accurately control the timing of capturing the voltage signal. Due to the edge-triggered characteristic of the D flip-flop, the interference of the input voltage signal during the high level of the clock signal can be effectively reduced, and the anti-interference ability is improved.

[0055] In some embodiments of the present application, the abnormal current information includes the abnormal current occurrence time, the abnormal current duration, and the current direction of the abnormal current.

[0056] The abnormal current alarm is used to output abnormal current information in response to the abnormal alarm signal; the fault recording module stores abnormal current information. The collection of abnormal current information is crucial for the abnormal current monitoring device, because the abnormal current information can help monitor the status of the power module and the power system, discover potential problems in time, and take corresponding measures. In the embodiment of the present application, the abnormal current information includes the following key parameters, and the abnormal current information includes the abnormal current occurrence time, the abnormal current duration, and the current direction of the abnormal current. The abnormal current occurrence time is the specific time when the abnormal current occurs in the abnormal current monitoring device. The monitoring personnel determine the exact moment when the abnormal current monitoring device occurs according to the abnormal current occurrence time. The abnormal current duration refers to the duration from the start of the abnormal current to the end of the abnormal current. The abnormal current duration helps to assess the severity of the abnormal current problem and is used to determine whether it is necessary to take the action of cutting off the power supply of the power module. It can be understood that when the abnormal current duration is greater than the preset time threshold, the power module is cut off to avoid damage to the abnormal current monitoring device. The current direction of the abnormal current is crucial to distinguish whether the abnormality occurs during charging or discharging. The change in the direction of the abnormal current may indicate different problems, such as poor contact, short circuit or inverter failure. The abnormal current alarm is implemented by borrowing the BMS main control chip.

[0057] In some embodiments of the present application, abnormal current information such as the time of occurrence of the abnormal current, the duration of the abnormal current and the current direction of the abnormal current is transmitted through a CAN signal, which is a serial communication protocol; the abnormal current information is transmitted between the various modules of the current abnormality monitoring device through the CAN signal, so that each module can share the key data of the abnormal current information, and judge the fault information of the abnormal current based on the CAN signal of the abnormal current information, thereby ensuring the traceability of the abnormal current and improving the reliability of the vehicle's fault information analysis.

[0058] In some embodiments of the present application, the current direction of the abnormal current is from the power module to the charger end, or the current direction of the abnormal current is from the charger end to the power module.

[0059] The current direction of the abnormal current is crucial to distinguish whether the abnormality occurs during charging or discharging. The fault information is judged based on the current direction of the abnormal current. The current direction of the abnormal current includes flowing from the power module to the charger end or from the charger end to the power module. It is understandable that when the charging circuit has a device burnout and the fuse abnormally breaks, when the current direction of the abnormal current flows from the power module to the charger end, it is judged that the charger has a fault, and when the current direction of the abnormal current flows from the charger end to the power module, it is judged that the power module has a fault. By real-time monitoring of the current direction from the power module to the charger or from the charger to the power module, the source of the current fault can be accurately diagnosed, the traceability of the abnormal current can be ensured, and the reliability of the vehicle's fault information analysis can be improved; and corresponding safety measures can be taken when necessary, thereby improving the safety and working reliability of the current abnormality monitoring device.

[0060] Reference Figure 3 As shown, Figure 3 It is a structural schematic diagram of a fluxgate current sensor provided in an embodiment of the present application. The fluxgate current sensor includes an electromagnetic coil and a self-excited oscillator. The electromagnetic coil includes an excitation winding and an iron core. The self-excited oscillator is connected to the excitation winding, and the self-excited oscillator is used to generate a sinusoidal wave signal.

[0061] The fluxgate current sensor is a high-precision current measurement device that accurately measures the current based on the principle of electromagnetic induction. The fluxgate current sensor usually includes an electromagnetic coil and a self-excited oscillator, which is connected to the excitation winding and is used to generate a sine wave signal. It can be understood that the core component of the fluxgate current sensor is a closed fluxgate. The fluxgate current sensor contains an iron core and a coil wound on the iron core, namely the excitation winding. When the measured current passes through the excitation winding of the fluxgate current sensor, a magnetic field is generated in the iron core. According to Faraday's law of electromagnetic induction, the generated magnetic field will excite the induced electromotive force in the excitation winding. The magnitude of the current passing through the excitation winding is determined by measuring the magnitude of this induced electromotive force. The fluxgate current sensor can measure various AC, DC, pulse and composite signals, and has the characteristics of high precision, high accuracy over the full temperature range, extremely low temperature drift (gain and offset), electrical isolation and fast response time.

[0062] It should be noted that in some embodiments of the present application, the measurement bandwidth of the fluxgate current sensor should be no less than 0 to 100kHz; the accuracy in the full temperature range should be no less than 500ppm; the temperature stability in the full measurement range should be no less than 50ppm; the linearity in the full measurement range should be no less than 50ppm; the zero offset current in the full temperature range should be no more than ±10μA; and the response time should be no more than 1μs. The fluxgate sensor uses self-excited demagnetization, multi-point zero flux, temperature control compensation and other technologies to achieve the above measurement accuracy requirements.

[0063] In some embodiments of the present application, the fluxgate current sensor also includes a peak detector, which is connected to the excitation winding. The peak detector is used to generate a square wave signal, and the square wave signal is used to act on the excitation winding and generate reverse magnetic flux in the iron core.

[0064] The peak detector is an important component in the fluxgate current sensor. The peak detector is connected to the excitation winding. The peak detector is used to generate a square wave signal and capture and hold the peak value of the input signal. The peak detector can generate a square wave signal, which acts on the excitation winding and generates a reverse magnetic flux in the iron core, thereby modulating and demodulating the magnetic flux to achieve current measurement.

[0065] In some embodiments of the present application, the fluxgate current sensor further includes a feedback module and an integral filter, the input end of the feedback module is connected to the excitation winding, and the output end of the feedback module is connected to the input end of the integral filter.

[0066] The fluxgate current sensor also includes a feedback module, the input end of the feedback module is connected to the excitation winding, the output end of the feedback module is connected to the input end of the integral filter, and the fluxgate current sensor maintains a zero flux state through closed-loop control, thereby improving the accuracy and stability of the measurement. The integral filter is used to process the square wave signal generated by the peak detector and convert the square wave signal into a voltage signal that can be used for measurement and control.

[0067] The feedback module detects the magnetic flux in the core by comparing the excitation signal with the output signal of the compensation excitation winding, and transmits the output signal to the integral filter, which smoothes the output signal. The integral filter can remove high-frequency noise, improve the signal-to-noise ratio of the signal, and can be used to achieve waveform conversion, signal smoothing and other functions. The integral filter is used in conjunction with the peak detector. The integral filter converts the square wave signal generated by the peak detector into a voltage signal that can represent the current size. This voltage signal is used for further signal processing or control, such as triggering the abnormal current alarm module.

[0068] In some embodiments of the present application, the fluxgate current sensor also includes a PI control module, the input end of the PI control module is connected to the output end of the integral filter, and the output end of the PI control module is connected to the excitation winding; the product of the current output by the output end of the PI control module and the coil turns ratio of the excitation winding is the current output by the power supply module.

[0069] The feedback module compares the excitation signal with the compensation excitation winding output signal, and the input end of the PI control module is connected to the output end of the integral filter. The integral filter is used to smooth the current, integrate the filter signal and remove noise, and provide the cumulative information of the current; the PI control module receives the signal processed by the integral filter and inputs it into the PI control module to realize zero flux control in the iron core. The output end of the PI control module is connected to the excitation winding. The product of the current output from the output end of the PI control module and the coil turns ratio of the excitation winding is the current output by the power module. It can be understood that the PI control module is used to accurately control the current output by the power module. The PI control module combines proportional control and integral control to achieve rapid response and stable control of the current. The output end of the PI control module is connected to the excitation winding to provide control current. The product of the output current of the PI control module and the coil turns ratio of the excitation winding is equal to the current output by the power module, ensuring that the output current of the excitation winding is proportional to the control signal of the PI control module, thereby realizing precise current control. The PI control module can accurately control the current output by the power module and ensure stable current output even when the load or parameters change, which is crucial to improving the efficiency and reliability of the power module.

[0070] Reference Figure 4 As shown, Figure 4 Another embodiment of the present application provides a structural schematic diagram of a fluxgate current sensor. In some embodiments of the present application, the current anomaly monitoring device also includes a voltage divider module, the voltage divider module includes a first resistor and a second resistor, and the first resistor and the second resistor are connected in series.

[0071] The current anomaly monitoring device also includes a voltage dividing module, wherein the voltage dividing module includes a first resistor and a second resistor connected in series, the first end of the first resistor is connected to the voltage comparison module, the second end of the first resistor is connected to the positive electrode of the power module, 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 grounded. It can be understood that, in one embodiment, the voltage output of the positive electrode of the power module is 12V, and the voltage dividing module is set in the current anomaly monitoring device. Through the voltage dividing effect of the first resistor and the second resistor, the voltage output of the positive electrode of the power module can be reduced to generate a standard voltage, so that the voltage output of the power module of the current anomaly monitoring device under normal operation drops to a preset voltage threshold, and the preset voltage threshold can be 6V, thereby ensuring the normal operation of the current anomaly monitoring device.

[0072] In some embodiments of the present application, the abnormal current monitoring device further includes a host computer, which is communicatively connected to the fault recording module, and the host computer is used to display abnormal current information or retrieve abnormal current information.

[0073] The abnormal current monitoring device is provided with a host computer, which is connected to the fault recording module in communication. The host computer has the functions of data display, data retrieval, communication connection and user interaction. In terms of data display, the host computer displays abnormal current information in real time, including the time, duration and current direction of the abnormal current; in terms of data retrieval, the host computer can retrieve historical abnormal current information to facilitate subsequent data analysis and fault diagnosis. In terms of communication connection, the host computer is connected to the fault recording module in communication to obtain and store detailed information of abnormal current events. In terms of user interaction, the host computer provides a user operation interaction interface, so that the user can easily monitor the status of the abnormal current monitoring device and perform necessary power-off operations at abnormal times to ensure the safety of the charging circuit.

[0074] Reference Figure 5 As shown, Figure 5 is a flow chart of a current anomaly monitoring method provided in an embodiment of the present application. The current anomaly monitoring method includes but is not limited to steps S100 to S500. Specifically,

[0075] Step S100: acquiring and monitoring the current signal output by the power module;

[0076] Step S200: converting the current signal into a voltage signal;

[0077] Step S300: when the voltage signal is greater than a preset voltage threshold, an abnormal alarm signal is output;

[0078] Step S400: outputting abnormal current information in response to an abnormal alarm signal;

[0079] Step S500: storing abnormal current information.

[0080] In some embodiments of the present application, the current anomaly monitoring method is applied to a current anomaly monitoring device, which includes: a fluxgate current sensor, which is mounted on a power module, and the fluxgate current sensor is used to monitor the current signal output by the power module; a voltage conversion resistor, which is connected to the output end of the fluxgate current sensor, and the current-to-voltage conversion resistor is used to convert the current signal into a voltage signal; a voltage comparison module, which is connected in parallel with the current-to-voltage conversion resistor, and the voltage comparison module is used to output an abnormal alarm signal when the voltage signal is greater than a preset voltage threshold; an abnormal current alarm module, which is connected to the voltage comparison module, and the abnormal current alarm is used to respond to the abnormal alarm signal and output abnormal current information; a fault recording module, which is connected to the abnormal current alarm module and is used to store abnormal current information.

[0081] The current anomaly monitoring method in the embodiment of the present application includes: acquiring and monitoring the current signal output by the power module through a fluxgate current sensor, improving the resolution of current monitoring and the accuracy of current monitoring results, and accurately monitoring the fault current of the current anomaly monitoring device; the current-voltage conversion resistor converts the current signal into a voltage signal; the voltage comparison module compares the voltage signal with a preset voltage threshold, and when the voltage signal is greater than the preset voltage threshold, outputs an abnormal alarm signal to remind the user or the current anomaly monitoring device that an abnormal situation exists, the abnormal current alarm module outputs abnormal current information, and the monitoring personnel can confirm the traceability of the current direction of the abnormal current based on the abnormal current information, and perform fault analysis on the vehicle based on the current direction of the abnormal current, thereby improving the reliability of the vehicle's fault information analysis, and the fault recording module stores the abnormal current information to provide historical data for the fault analysis and processing of the current anomaly monitoring device, thereby further improving the reliability of the vehicle's fault information analysis.

[0082] In some embodiments of the present application, the current abnormality monitoring device further includes a host computer, the host computer is communicatively connected to the fault recording module, and the current abnormality monitoring method further includes step S600, specifically,

[0083] Step S600: In response to the fault reading signal, display abnormal current information or retrieve abnormal current information according to the fault reading signal, the abnormal current information including abnormal current occurrence time, abnormal current duration and current direction of the abnormal current.

[0084] The current abnormality monitoring method also includes: in response to the fault reading signal, the host computer displays abnormal current information or retrieves abnormal current information, so that the monitoring personnel can analyze the abnormal current data and diagnose the fault according to the abnormal current information. For example: in response to the fault reading signal, the host computer displays abnormal current information in real time, and the abnormal current information includes the time, duration and current direction of the abnormal current, etc. By determining the current direction of the abnormal current, the traceability of the current direction of the abnormal current can be ensured to improve the reliability of the fault information analysis of the vehicle; the host computer retrieves the historical abnormal current information to facilitate abnormal current data analysis and fault diagnosis, and the host computer provides a user operation interaction interface, so that the user can easily monitor the status of the current abnormality monitoring device, and perform necessary power-off operations at abnormal times to ensure the safety of the charging circuit.

[0085] Reference Figure 6 As shown, Figure 6 It is a structural diagram of a controller provided in an embodiment of the present application, including a processor 1001, which can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the method provided in the embodiment of the present application; a memory 1002, which can be implemented in the form of a read-only memory 1002 (Read Only Memory, ROM), a static storage device, a dynamic storage device or a random access memory 1002 (Random Access Memory, RAM), etc. The memory 1002 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented by software or firmware, the relevant program codes are stored in the memory 1002 and are called by the processor 1001 to execute the embodiments of this application; the input / output interface 1003 is used to implement information input and output; the communication interface 1004 is used to implement communication interaction between this device and other devices, and communication can be achieved through wired methods (such as USB, network cables, etc.) or wireless methods (such as mobile networks, WIFI, Bluetooth, etc.); a bus transmits information between various components of the device (such as the processor 1001, the memory 1002, the input / output interface 1003 and the communication interface 1004); wherein the processor 1001, the memory 1002, the input / output interface 1003 and the communication interface 1004 are connected to each other within the device through the bus.

[0086] The embodiment of the present application also provides a vehicle, which includes the current abnormality monitoring device and controller described in the above embodiment. The vehicle includes a current abnormality monitoring device, and the vehicle uses a fluxgate current sensor as a current monitoring tool of the current abnormality monitoring device to replace the Hall sensor commonly used in current new energy vehicles, so as to improve the resolution of current monitoring and the accuracy of current monitoring results, and accurately detect the vehicle fault current; the current-voltage conversion resistor is used to convert the current signal into a voltage signal; the voltage comparison module compares the voltage signal with a preset voltage threshold, and when the voltage signal is greater than the preset voltage threshold, outputs an abnormal alarm signal to remind the user or the current abnormality monitoring device that there is an abnormal situation, and the abnormal current alarm module outputs abnormal current information, and the monitoring personnel can confirm the traceability of the current direction of the abnormal current according to the abnormal current information, and perform fault analysis on the vehicle according to the current direction of the abnormal current, thereby improving the reliability of the fault information analysis of the vehicle, and the fault recording module stores the abnormal current information, so as to provide historical data for the fault analysis and processing of the current abnormality monitoring device, thereby further improving the reliability of the fault information analysis of the vehicle. The function of the D trigger is to latch the peak voltage signal greater than the preset voltage threshold converted from the peak current, and the abnormal current alarm module connected to the output end of the D trigger responds according to the peak voltage signal. Abnormal current information such as the time of occurrence of abnormal current, duration of abnormal current and current direction of abnormal current is transmitted through CAN signal. The current direction of abnormal current is from the power module to the charger end, or the current direction of abnormal current is from the charger end to the power module. When the vehicle charging circuit has a device burnout and the fuse is abnormally disconnected, when the current direction of abnormal current is from the power module to the charger end, it is judged that the charger has a fault, and when the current direction of abnormal current is from the charger end to the power module, it is judged that the power module has a fault; it can accurately diagnose the source of current fault, ensure the traceability of abnormal current, and improve the reliability of vehicle fault information analysis. A voltage divider module is set in the current abnormality monitoring device. Through the voltage divider effect of the first resistor and the second resistor of the voltage divider module, the voltage output of the positive electrode of the power module can be reduced to generate a standard voltage, so that the voltage output of the power module of the current abnormality monitoring device under normal working conditions drops to a preset voltage threshold, thereby ensuring the normal operation of the current abnormality monitoring device. The abnormal current monitoring device also includes a host computer, which is communicatively connected to the fault recording module, and the host computer is used to display abnormal current information or retrieve abnormal current information to improve the visualization of abnormal current monitoring results. The embodiment of the present application is conducive to improving the resolution of vehicle current monitoring and the accuracy of current monitoring results, while ensuring the traceability of the current direction of abnormal current to improve the reliability of vehicle fault information analysis.

[0087] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer-readable storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer-readable storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer-readable storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0088] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the description, claims and drawings.

Claims

1. A current abnormality monitoring device, characterized in that: include: A fluxgate current sensor is mounted on the power module, and is used to monitor the current signal output by the power module; A current-to-voltage conversion resistor connected to the output end of the fluxgate current sensor, the current-to-voltage conversion resistor being used to convert the current signal into a voltage signal; A voltage comparison module is connected in parallel with the current-to-voltage conversion resistor, and the voltage comparison module is used to output an abnormal alarm signal when the voltage signal is greater than a preset voltage threshold; An abnormal current alarm module, connected to the voltage comparison module, the abnormal current alarm is used to output abnormal current information in response to the abnormal alarm signal; A fault recording module is connected to the abnormal current alarm module and is used to store the abnormal current information.

2. The current abnormality monitoring device according to claim 1, characterized in that: Also includes: A D trigger is connected to the output end of the voltage comparison module, and is used to latch a peak voltage signal converted from a peak current and greater than a preset voltage threshold.

3. The current abnormality monitoring device according to claim 1, characterized in that: The abnormal current information includes abnormal current occurrence time, abnormal current duration and current direction of the abnormal current.

4. The current abnormality monitoring device according to claim 3, characterized in that: The current direction of the abnormal current is from the power module to the charger end, or the current direction of the abnormal current is from the charger end to the power module.

5. The current abnormality monitoring device according to claim 1, characterized in that: The fluxgate current sensor comprises an electromagnetic coil and a self-excited oscillator. The electromagnetic coil comprises an exciting winding and an iron core. The self-excited oscillator is connected to the exciting winding. The self-excited oscillator is used to generate a sinusoidal wave signal.

6. The current abnormality monitoring device according to claim 5, characterized in that: The fluxgate current sensor also includes a peak detector, which is connected to the excitation winding and is used to generate a square wave signal. The square wave signal is used to act on the excitation winding and generate a reverse magnetic flux in the iron core.

7. The current abnormality monitoring device according to claim 5, characterized in that: The fluxgate current sensor further includes a feedback module and an integral filter. The input end of the feedback module is connected to the excitation winding, and the output end of the feedback module is connected to the input end of the integral filter.

8. The current abnormality monitoring device according to claim 7, characterized in that: The fluxgate current sensor also includes a PI control module, an input end of the PI control module is connected to the output end of the integral filter, and an output end of the PI control module is connected to the excitation winding; the product of the current output by the output end of the PI control module and the coil turns ratio of the excitation winding is the current output by the power supply module.

9. The current abnormality monitoring device according to claim 1, characterized in that: It also includes a voltage dividing module, which includes a first resistor and a second resistor, and the first resistor and the second resistor are connected in series.

10. The current abnormality monitoring device according to claim 1, characterized in that: It also includes a host computer, which is communicatively connected to the fault recording module, and is used to display the abnormal current information or retrieve the abnormal current information.

11. A method for monitoring abnormal current, applied to the abnormal current monitoring device according to any one of claims 1 to 10, characterized in that: include: Obtain and monitor the current signal output by the power module; Converting the current signal into a voltage signal; When the voltage signal is greater than a preset voltage threshold, an abnormal alarm signal is output; In response to the abnormal alarm signal, output abnormal current information; The abnormal current information is stored.

12. The current abnormality monitoring method according to claim 1, characterized in that: The current abnormality monitoring device further includes a host computer, and the host computer is communicatively connected to the fault recording module. The method further includes: In response to the fault reading signal, the abnormal current information is displayed or retrieved according to the fault reading signal, wherein the abnormal current information includes the abnormal current occurrence time, the abnormal current duration and the current direction of the abnormal current.

13. A vehicle, characterized in that: The device comprises a current abnormality monitoring device as claimed in any one of claims 1 to 10.

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