High-voltage interlocking detection method, high-voltage interlocking detection system and computer equipment

Abstract

The invention relates to a high-voltage interlocking detection method, a high-voltage interlocking detection system and computer equipment. The high-voltage interlocking detection system comprises a controller of a vehicle and all high-voltage components. The controller and the low-voltage interlocking wire harness form a low-voltage interlocking loop; the high-voltage components are connected in series in the low-voltage interlocking loop through low-voltage interlocking wire harnesses; and the controller is respectively connected with each high-voltage component. The method comprises the following steps: performing low-voltage detection on a low-voltage interlocking loop to obtain a first detection state; and acquiring a voltage state corresponding to each high-voltage component, and determining a high-voltage interlocking detection result according to the voltage state and the first detection state. Through the method and the device, the problem of low detection accuracy caused by false alarm in related technologies is solved, the robustness of high-voltage interlocking detection is enhanced by combining the voltage state corresponding to each high-voltage component with the first detection state of low-voltage detection, and the driving safety is improved.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and in particular to a high-voltage interlock detection method, a high-voltage interlock detection system and a computer device. Background Art

[0002] High-voltage interlock detection is widely used in various new energy vehicle models. The purpose is to ensure the correct connection of each high-voltage connector and ensure that the high-voltage system works normally without causing electrical damage. The high-voltage interlock detection scheme currently widely used in the market is to connect each component in series with a low-voltage interlock wire to form a low-voltage circuit, and use the vehicle controller to perform high-voltage interlock detection through a low-voltage circuit. The vehicle controller sends a specific PWM signal on the low-voltage circuit and detects the signal at the receiving end of the low-voltage circuit. When a connector in the low-voltage circuit is unplugged or disconnected by mistake, the low-voltage circuit is disconnected, affecting the signal. Then, based on the detection result of the signal, the high-voltage interlock fault can be determined. The disadvantage of this scheme is that the low-voltage circuit will have false interlock faults due to the withdrawal of the low-voltage connector or poor low-voltage plug-in process, resulting in low detection accuracy.

[0003] There are false positives in related technologies, which results in low detection accuracy. Currently, no effective solution has been proposed. Summary of the invention

[0004] In this embodiment, a high-voltage interlock detection method, a high-voltage interlock detection system and a computer device are provided to solve the problem of false alarms and low detection accuracy in related technologies.

[0005] In a first aspect, a high-voltage interlock detection method is provided in this embodiment, which is applicable to a high-voltage interlock detection system, wherein the high-voltage interlock detection system comprises: a vehicle controller and various high-voltage components; a low-voltage interlock circuit is formed by the controller and a low-voltage interlock wiring harness; each of the high-voltage components is connected in series in the low-voltage interlock circuit through the low-voltage interlock wiring harness; the controller is connected to each of the high-voltage components respectively; the method comprises:

[0006] Performing a low-voltage detection on the low-voltage interlocking circuit to obtain a first detection state;

[0007] The voltage state corresponding to each of the high-voltage components is acquired, and the detection result of the high-voltage interlock is determined according to the voltage state and the first detection state.

[0008] In some embodiments, performing low voltage detection on the low voltage interlocking circuit to obtain a first detection state includes:

[0009] The detection signal is received by the receiving end of the controller; the detection signal is sent by the sending end of the controller and flows through the low voltage interlocking circuit;

[0010] The received detection signal is compared with a preset signal threshold to obtain a first detection state.

[0011] In some of the embodiments, the high-voltage component is one or more of a power battery, a front drive motor, a rear drive motor, an electric compressor, an on-board charger, an on-board DC / DC converter, and an air conditioner.

[0012] In some embodiments, obtaining a voltage state corresponding to each of the high-voltage components, and determining a detection result of the high-voltage interlock according to the voltage state and the first detection state, includes:

[0013] When the vehicle is not powered by high voltage, determining a detection result of the high voltage interlock according to the first detection state;

[0014] When high voltage is applied to the vehicle, a voltage state corresponding to each of the high voltage components is obtained, and a detection result of the high voltage interlock is determined according to the voltage state and the first detection state.

[0015] In some embodiments, when the vehicle is powered on with high voltage, obtaining a voltage state corresponding to each of the high voltage components, and determining a detection result of the high voltage interlock according to the voltage state and the first detection state, includes:

[0016] When high voltage is applied to the vehicle, the voltage state corresponding to each high voltage component is obtained to perform high voltage detection. If the first detection state is other low voltage interlock faults, the other low voltage interlock faults are reported to the cloud server as the detection result. If the hood is detected to be open, the instrument of the vehicle is controlled to give an audible and visual alarm, and the high voltage power supply is cut off.

[0017] During the high-voltage detection process, if the voltage state of the power battery in the high-voltage component is abnormal communication or abnormal voltage; then other high-voltage interlock faults are generated and reported to the cloud server as the detection result; at this time, if the first detection state is an open circuit fault of the low-voltage interlock, the instrument of the vehicle is controlled to give an audible and visual alarm, and the power supply of the high-voltage electricity is cut off after the vehicle speed is less than a preset speed threshold; if the first detection state is a normal low-voltage interlock or other low-voltage interlock faults, and the engine hood is detected to be opened, the instrument of the vehicle is controlled to give an audible and visual alarm, and the power supply of the high-voltage electricity is cut off;

[0018] During the high-voltage detection process, if the voltage status of each of the high-voltage components except the power battery is communication abnormality or voltage abnormality; then the high-voltage interlock other faults are generated and reported to the cloud server as the detection result; at this time, if the first detection status is a low-voltage interlock open circuit fault, the vehicle's instrument is controlled to give an audible and visual alarm, and the high-voltage power supply is cut off after the vehicle speed is less than a preset speed threshold; if the first detection status is that the low-voltage interlock is normal or the low-voltage interlock other faults, and the engine hood is detected to be opened, the vehicle's instrument is controlled to give an audible and visual alarm, and the high-voltage power supply is cut off after the vehicle speed is less than the preset speed threshold;

[0019] During the high-voltage detection process, if the voltage state of each of the high-voltage components is normal, and the ratio of the high-voltage side voltage corresponding to each of the high-voltage components to the reference voltage of the power battery meets the preset detection conditions, a high-voltage interlock open circuit fault is generated as the detection result and reported to the cloud server, and the vehicle's instrument is controlled to give an audible and visual alarm, and the high-voltage power supply is cut off after the vehicle speed is less than the preset speed threshold.

[0020] In some embodiments, the method further comprises:

[0021] After the detection result of the high-voltage interlock open-circuit fault is reported to the cloud server, locking and cutting off the power supply of the high-voltage electricity;

[0022] After receiving a clear instruction from the diagnostic instrument of the vehicle, the detection result is restored to normal and the lock is released.

[0023] In some embodiments, the method further comprises:

[0024] When the detection result is reported to the cloud server, the corresponding component failure information is also reported.

[0025] In a second aspect, a high-voltage interlock detection system is provided in this embodiment, comprising: a vehicle controller and various high-voltage components; a low-voltage interlock circuit is formed by the controller and the low-voltage interlock wiring harness; each of the high-voltage components is connected in series in the low-voltage interlock circuit through the low-voltage interlock wiring harness; the controller is connected to each of the high-voltage components respectively;

[0026] The controller is used to execute the high-voltage interlock detection method described in the first aspect above.

[0027] In a third aspect, a computer device is provided in this embodiment, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the high-voltage interlock detection method described in the first aspect when executing the computer program.

[0028] In a fourth aspect, in this embodiment, a storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the high-voltage interlock detection method described in the first aspect is implemented.

[0029] Compared with the related art, the high-voltage interlock detection method, high-voltage interlock detection system and computer equipment provided in this embodiment are applicable to the high-voltage interlock detection system, which includes: a vehicle controller and various high-voltage components; a low-voltage interlock circuit formed by the controller and the low-voltage interlock wiring harness; each high-voltage component is connected in series in the low-voltage interlock circuit through the low-voltage interlock wiring harness; and the controller is connected to each high-voltage component. Among them, the method obtains a first detection state by performing low-voltage detection on the low-voltage interlock circuit; obtains the voltage state corresponding to each high-voltage component, and determines the detection result of the high-voltage interlock according to the voltage state and the first detection state, which solves the problem of false alarms in the related art and low detection accuracy, and uses the voltage state corresponding to each high-voltage component combined with the first detection state of the low-voltage detection to enhance the robustness of the high-voltage interlock detection and improve driving safety.

[0030] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0032] Figure 1 It is a hardware structure block diagram of a terminal device of a high-voltage interlock detection method provided in an embodiment of the present application;

[0033] Figure 2 is a structural block diagram of a high voltage interlock detection system provided by an embodiment of the present application;

[0034] Figure 3 is a flow chart of a high voltage interlock detection method provided by an embodiment of the present application;

[0035] Figure 4 is a flowchart of step S220;

[0036] Figure 5 This is a flowchart of step S222.

[0037] In the figure: 102, processor; 104, memory; 106, transmission device; 108, input and output device; 10, controller; 20, power battery; 30, front drive motor; 40, rear drive motor; 50, electric compressor; 60, on-board charger; 70, on-board DC / DC converter; 80, air conditioner; 90, instrument; 100, communication bus; 110, cloud server. DETAILED DESCRIPTION

[0038] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0039] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the", "these" and the like in this application do not represent quantitative restrictions, and they can be singular or plural. The terms "include", "comprise", "have" and any variants thereof involved in this application are intended to cover non-exclusive inclusions; for example, a process, method and system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether directly or indirectly. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. Usually, the character " / " indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0040] The method embodiment provided in this embodiment can be executed in a terminal, a computer or a similar computing device. For example, running on a terminal, Figure 1 : is a hardware structure block diagram of the terminal of the high voltage interlock detection method of this embodiment. Figure 1 As shown, the terminal may include one or more ( Figure 1Only one is shown in the figure) processor 102 and memory 104 for storing data, wherein processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA. The above terminal may also include a transmission device 106 and an input and output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0041] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the high-voltage interlock detection method in the present embodiment. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0042] The transmission device 106 is used to receive or send data via a network. The above network includes a wireless network provided by the communication provider of the terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (Radio Frequency, referred to as RF) module, which is used to communicate with the Internet wirelessly.

[0043] It should be noted that the method embodiment provided in this embodiment can be applied to a high voltage interlock detection system, such as Figure 2 The structure diagram of the high-voltage interlock detection system is shown, which includes: a vehicle controller 10 and various high-voltage components; a low-voltage interlock circuit is formed by the controller 10 and the low-voltage interlock wiring harness; various high-voltage components are connected in series in the low-voltage interlock circuit through the low-voltage interlock wiring harness; the controller 10 is connected to each high-voltage component. The dot-dash line in the figure is the high-voltage wiring harness.

[0044] Among them, the high-voltage components include but are not limited to the power battery 20, the front drive motor 30, the rear drive motor 40, the electric compressor 50, the on-board charger 60 (OBC), the on-board DC / DC converter 70 and the air conditioner 80 (PTC). The front drive motor 30, the rear drive motor 40, the electric compressor 50, the on-board charger 60 (OBC), the on-board DC / DC converter 70 and the air conditioner 80 (PTC) are connected to the power battery 20 through a high-voltage wiring harness; each high-voltage component has built-in hardware (sensors and processors, or sensors with processing functions, etc.) to collect the high-voltage side voltage corresponding to each component, and transmit the high-voltage side voltage to the controller 10. For example: for the power battery 20, the corresponding high-voltage side voltage is the reference voltage, which can also be called the Pack voltage. For another example: for the front drive motor 30, it is the corresponding high-voltage side voltage.

[0045] Among them, the low-voltage interlocking harness starts from the transmitting end of the controller 10, connects in series the power battery 20, the front drive motor 30, the rear drive motor 40, the electric compressor 50, the on-board charger 60 (OBC), the on-board DC / DC converter 70, and the air conditioner 80 (PTC), and then returns to the receiving end of the controller 10, thereby forming a low-voltage interlocking loop (the dotted line in the figure is a low-voltage interlocking loop).

[0046] On the basis of the above-mentioned high-voltage interlock detection system, it also includes an instrument 90 (DHU), a communication bus 100 and a cloud server 110; wherein the communication bus 100 is respectively connected to the controller 10 and each high-voltage component, and is used to transmit data related to each high-voltage component (including but not limited to voltage status, high-voltage side voltage and reference voltage, etc.) to the controller 10; the instrument 90 is connected to the controller 10, and is used to perform sound and light alarms under the control of the controller 10; the cloud server 110 is connected to the controller 10, and is used to store the detection results.

[0047] In this embodiment, a high voltage interlock detection method is provided. Figure 3 is a flow chart of the high voltage interlock detection method of this embodiment. As shown in the figure, the process includes the following steps:

[0048] Step S210, performing low voltage detection on the low voltage interlocking circuit to obtain a first detection state;

[0049] Step S220, obtaining the voltage state corresponding to each high-voltage component, and determining the detection result of the high-voltage interlock according to the voltage state and the first detection state.

[0050] Among them, low-voltage detection refers to the control-led, sending a specific detection signal on the low-voltage interlocking loop, and detecting the signal at the receiving end of the low-voltage interlocking loop. When a wiring harness plug-in in the low-voltage loop is unplugged or disconnected by mistake, the low-voltage interlocking loop is disconnected, which will affect the signal. Then, by low-voltage detection of the received detection signal, the first detection state can be obtained; the first detection state includes normal low-voltage interlocking, low-voltage interlocking open circuit fault and other low-voltage interlocking faults. In the related art, the first detection state is directly used as the detection result of the high-voltage interlocking fault; at this time, the following situations may exist: 1. The quality or process problems of the low-voltage wiring harness terminal in the low-voltage interlocking loop cause the pin to retreat on bumpy sections, which in turn causes poor contact of the low-voltage wiring harness and falsely reports a low-voltage interlocking open circuit fault; and it is normal on stable sections; this type of fault cannot be troubleshooted. 2. The low-voltage harness terminal is short-circuited to the ground or the power supply. At this time, the high-voltage circuit is connected, but the low-voltage interlock circuit will also falsely report an interlock fault due to the damage of the low-voltage harness. In fact, the high-voltage interlock is not faulty at this time, and only the low-voltage terminal harness problem needs to be repaired. These situations will lead to false alarms and low detection accuracy.

[0051] Therefore, in this embodiment, the voltage state corresponding to each high-voltage component is obtained, and the voltage state and the first detection state are input into a well-trained neural network model, or the detection result of the high-voltage interlock is determined based on the voltage state and the first detection state based on a preset strategy; thereby, the voltage state corresponding to each high-voltage component is combined with the first detection state of the low-voltage detection to enhance the robustness of the high-voltage interlock detection and improve driving safety; and effectively avoid misjudgment caused by low-voltage terminal process problems, poor contact problems and low-voltage wiring harness short circuit to ground in related schemes.

[0052] In some embodiments, the step S210 of performing low voltage detection on the low voltage interlock circuit to obtain a first detection state includes the following steps:

[0053] Step S211, the detection signal is received by the receiving end of the controller; the detection signal is sent by the sending end of the controller and flows through the low voltage interlocking circuit;

[0054] Step S212: compare the received detection signal with a preset signal threshold to obtain a first detection state.

[0055] Specifically, the detection signal can be a constant current source or a PWM signal; for different detection signals, the implementation process of low-voltage detection is the same. The process is: the detection signal is sent by the sending end of the controller, the detection signal flows through the low-voltage interlocking circuit, and then is received by the receiving end of the controller; because the low-voltage interlocking circuit is connected in series with various high-voltage components, the high-voltage components and the voltage circuit harness are connected through a harness plug-in. Once a harness plug-in is unplugged or disconnected by mistake, the controller receiving end cannot receive the detection signal, then the first detection state is other low-voltage interlock faults. If the detection signal can be received normally, the detection signal is compared with the preset signal threshold. If the received detection signal meets the preset signal threshold, the first detection state is that the low-voltage interlock is normal; if the received detection signal does not meet the preset signal threshold, the first detection state is a low-voltage interlock open circuit fault.

[0056] Through this embodiment, the low voltage detection can be completed quickly, so that the controller obtains the first detection state, which facilitates the execution of subsequent steps.

[0057] In some embodiments, the step S220 of obtaining the voltage state corresponding to each high-voltage component and determining the detection result of the high-voltage interlock according to the voltage state and the first detection state includes the following steps:

[0058] Step S221, when the vehicle is not powered on by high voltage, determining a detection result of the high voltage interlock according to a first detection state;

[0059] Step S222, when high voltage is applied to the vehicle, the voltage state corresponding to each high voltage component is obtained, and the detection result of the high voltage interlock is determined according to the voltage state and the first detection state.

[0060] In this embodiment, it can be considered that it is implemented based on a strategy, and the detection of the high-voltage interlock is divided into two parts based on whether the vehicle has been powered on by high voltage.

[0061] Among them, for the part of the vehicle that is not connected to high voltage electricity: at this time, there is only low voltage detection, so the first detection state is directly used as the detection result of the high voltage interlock. For example: the detection result is normal (which can be represented by 0, that is, the low voltage interlock is normal as normal), and it is not processed at this time. The detection result is a high voltage interlock open circuit fault (which can be represented by 1, that is, the low voltage interlock open circuit fault is regarded as a high voltage interlock open circuit fault). If the engine cover is detected to be open, indicating that there is a maintenance intention, the vehicle's instrument is controlled to sound and light alarm, and the high voltage power supply is cut off to avoid high voltage hazards. Among them, the opening of the engine cover is detected by the cabin sensor, and the detected opening and closing signal is transmitted to the controller, so the controller can determine whether the engine cover is open. The detection result is other high voltage interlock faults (which can be represented by 2, that is, other low voltage interlock faults are regarded as other high voltage interlock faults), and it is not processed at this time.

[0062] Among them, for the high-voltage electrical part of the vehicle: at this time, it is necessary to obtain the voltage state corresponding to each high-voltage component, and determine the detection result of the high-voltage interlock according to the voltage state and the first detection state.

[0063] Through this embodiment, the operation efficiency is improved by classifying whether the vehicle is on high voltage electricity.

[0064] In some embodiments, when the high voltage is on the vehicle, obtaining the voltage state corresponding to each high voltage component in step S222, and determining the detection result of the high voltage interlock according to the voltage state and the first detection state, includes the following steps:

[0065] Step S2221, when the vehicle is powered on with high voltage, the voltage state corresponding to each high voltage component is obtained to perform high voltage detection. If the first detection state is a low voltage interlock other fault, the low voltage interlock other fault is reported to the cloud server as a detection result; if it is detected that the engine cover is opened, the vehicle's instrument is controlled to sound and light alarm, and the high voltage power supply is cut off;

[0066] Step S2222, during the high-voltage detection process, if the voltage state of the power battery in the high-voltage component is abnormal communication or abnormal voltage; then generate other high-voltage interlock faults as detection results and report to the cloud server; at this time, if the first detection state is a low-voltage interlock open circuit fault, then control the vehicle's instrument to sound and light alarm, and cut off the high-voltage power supply after the vehicle speed is less than a preset speed threshold; if the first detection state is a normal low-voltage interlock or other low-voltage interlock faults, and the engine hood is detected to be open, then control the vehicle's instrument to sound and light alarm, and cut off the high-voltage power supply;

[0067] Step S2223, during the high-voltage detection process, if the voltage status of each high-voltage component except the power battery is abnormal communication or abnormal voltage; then generate other high-voltage interlock faults as detection results and report to the cloud server; at this time, if the first detection status is a low-voltage interlock open circuit fault, then control the vehicle's instrument to sound and light alarm, and cut off the high-voltage power supply after the vehicle speed is less than the preset speed threshold; if the first detection status is a normal low-voltage interlock or other low-voltage interlock faults, and the hood is detected to be open, then control the vehicle's instrument to sound and light alarm, and cut off the high-voltage power supply after the vehicle speed is less than the preset speed threshold;

[0068] Step S2224, during the high-voltage detection process, if the voltage state of each high-voltage component is normal, and the ratio of the high-voltage side voltage corresponding to each high-voltage component to the reference voltage of the power battery meets the preset detection conditions, a high-voltage interlock open circuit fault is generated as a detection result and reported to the cloud server, and the vehicle's instrument is controlled to give an audible and visual alarm, and the high-voltage power supply is cut off after the vehicle speed is less than the preset speed threshold.

[0069] Specifically, for step S2221, at this time, the vehicle has just been connected to high voltage electricity, and the voltage status corresponding to each high-voltage component is first obtained to perform high-voltage detection; then before the high-voltage detection, it can be considered that the detection result of the high-voltage interlock is determined based on the first detection state. Specifically: If the first detection state is other low-voltage interlock faults, the other low-voltage interlock faults will be reported to the cloud server as the detection result (other low-voltage interlock faults will be converted to other high-voltage interlock faults); if the engine cover is detected to be open, the vehicle's instrument is controlled to sound and light alarms, and the high-voltage electricity supply is cut off. If the first detection state is normal low-voltage interlock or other low-voltage interlock faults, it will not be processed.

[0070] Step S2222 can be considered as the reference voltage detection in the high voltage detection. The reference voltage is the Pack voltage of the power battery, and the reference voltage detection is the detection of the Pack voltage; the reference voltage detection is divided into communication anomaly detection and voltage anomaly detection.

[0071] If the reference voltage is not obtained, it is considered that the communication is abnormal, and other high-voltage interlock faults are generated as detection results and reported to the cloud server; at the same time, the first detection state is monitored. At this time, if the first detection state is a low-voltage interlock open circuit fault, the vehicle's instrument is controlled to give an audible and visual alarm, and the high-voltage power supply is cut off after the vehicle speed is less than the preset speed threshold to avoid high-voltage hazards; if the first detection state is that the low-voltage interlock is normal, and the engine cover is detected to be open, it is considered that there is a maintenance intention, and the vehicle's instrument is controlled to give an audible and visual alarm, and the high-voltage power supply is cut off to avoid high-voltage hazards. If the first detection state is a low-voltage interlock other fault, and the engine cover is detected to be open, it is considered that there is a maintenance intention, the vehicle's instrument is controlled to give an audible and visual alarm, and the high-voltage power supply is cut off to avoid high-voltage hazards.

[0072] If the reference voltage is not within a reasonable range (according to the SOC table, the reasonable range of the Pack voltage is obtained (within 10% to 15% of the rated voltage, preferably 10%), and the real-time obtained Pack voltage is compared with the reasonable range to determine whether the Pack voltage is within the reasonable range), the voltage is considered abnormal, and other high-voltage interlock faults are generated and reported to the cloud server as detection results; at the same time, the first detection state is monitored. At this time, if the first detection state is a low-voltage interlock open circuit fault, the vehicle's instrument is controlled to sound and light alarm, and the high-voltage power supply is cut off to avoid high-voltage hazards; if the first detection state is that the low-voltage interlock is normal, and the engine cover is detected to be open, it is considered that there is a maintenance intention, and the vehicle's instrument is controlled to sound and light alarm, and the high-voltage power supply is cut off to avoid high-voltage hazards. If the first detection state is other low-voltage interlock faults, and the engine cover is detected to be open, it is considered that there is a maintenance intention, the vehicle's instrument is controlled to sound and light alarm, and the high-voltage power supply is cut off to avoid high-voltage hazards.

[0073] Step S2223 can be considered as a high-voltage side voltage detection of each high-voltage component except the power battery in the high-voltage detection. The high-voltage side voltage detection can also be divided into communication anomaly detection and voltage anomaly detection.

[0074] The controller synchronously obtains the high-voltage side voltage of all high-voltage components (front drive motor, rear drive motor, electric compressor, on-board charger, on-board DC / DC converter, air conditioner). If the high-voltage side voltage corresponding to any high-voltage component is not obtained, it is considered that the communication is abnormal, and other high-voltage interlock faults are generated as detection results and reported to the cloud server; at the same time, the first detection state is monitored. At this time, if the first detection state is a low-voltage interlock open circuit fault, the vehicle's instrument is controlled to sound and light alarm, and the high-voltage power supply is cut off after the vehicle speed is less than the preset speed threshold to avoid high-voltage hazards; if the first detection state is that the low-voltage interlock is normal, and the engine cover is detected to be open, it is considered that there is a maintenance intention, then the vehicle's instrument is controlled to sound and light alarm, and the high-voltage power supply is cut off after the vehicle speed is less than the preset speed threshold to avoid high-voltage hazards. If the first detection state is a low-voltage interlock other fault, and the engine cover is detected to be open, it is considered that there is a maintenance intention, then the vehicle's instrument is controlled to sound and light alarm, and the high-voltage power supply is cut off to avoid high-voltage hazards.

[0075] The controller synchronously obtains the high-voltage side voltage of all high-voltage components, and confirms whether there is a voltage calculation error based on the obtained high-voltage side voltage. The principle is: the power battery is the power source during normal use of the vehicle, and the high-voltage side voltage of other components should not be greater than the Pack voltage (OBC is used as the power source during AC charging, and its voltage is allowed to be greater than the Pack voltage). When all high-voltage components cannot calculate their high-voltage side voltage, they send an error value code (which can be the maximum voltage value that can be transmitted to reduce mistransmission) to the controller. When the controller receives the maximum voltage value sent by any high-voltage component, it is considered that the voltage of the component has no reference value. At this time, it is considered that the voltage is abnormal, and other high-voltage interlock faults are generated as detection results and reported to the cloud server; at the same time, the first detection state is monitored. At this time, if the first detection state is a low-voltage interlock open circuit fault, the vehicle's instrument is controlled to sound and light alarm, and the high-voltage power supply is cut off after the vehicle speed is less than the preset speed threshold to avoid high-voltage hazards; if the first detection state is that the low-voltage interlock is normal, and the engine cover is detected to be opened, it is considered that there is a maintenance intention, then the vehicle's instrument is controlled to sound and light alarm, and the high-voltage power supply is cut off after the vehicle speed is less than the preset speed threshold to avoid high-voltage hazards. If the first detection state is other low-voltage interlock faults and the hood is detected to be open, it is considered that there is a maintenance intention, so the vehicle's instruments are controlled to give audible and visual alarms, and the high-voltage power supply is cut off to avoid high-voltage hazards.

[0076] Step S2224, it can be considered that the voltage status of each high-voltage component is normal, there is no communication abnormality, and there is no voltage abnormality. The ratio of the high-voltage side voltage corresponding to each high-voltage component to the reference voltage of the power battery is calculated in real time to meet the preset detection conditions; the detection condition is that the ratio is below 80%-85% and maintained for 400ms-600ms; the preferred ratio is 80%, and the maintenance time is 500ms. At this time, it is considered that there is a high-voltage hazard, and a high-voltage interlock open circuit fault is generated as a detection result and reported to the cloud server, and the vehicle's instrument is controlled to sound and light alarm, and the high-voltage power supply is cut off after the vehicle speed is less than the preset speed threshold.

[0077] Among them, step S2223 and step S2224 can be performed simultaneously, and step S2224 has the highest priority. It can be considered that: when any high-voltage component is undervoltage (the ratio meets the detection condition), it is preferentially determined as a high-voltage interlock open circuit fault 1, and even if there is a high-voltage interlock other fault 2, it must be covered by 1. In other embodiments, the judgment of voltage abnormality in the voltage state can also be performed in the controller, and there is no limitation on this.

[0078] Through this embodiment, based on the implementation of the above process, high-voltage interlock detection can be completed quickly and accurately to ensure driving safety.

[0079] In some embodiments, the high voltage interlock detection method further includes the following steps:

[0080] After the detection result of the high-voltage interlock open circuit fault is reported to the cloud server, the high-voltage power supply is locked and cut off;

[0081] After receiving clear instructions from the vehicle's diagnostic instrument, the test results are restored to normal and the lock is released.

[0082] Specifically, after the controller reports the detection result of the high-voltage interlock open circuit fault to the cloud server, it locks and cuts off the high-voltage power supply, prohibits the establishment of high voltage again, and stores the high-voltage interlock open circuit fault; only after receiving the clear command from the diagnostic instrument, it will restore to the interlock state 0 (normal) and release the lock.

[0083] Through this embodiment, driving safety is further improved.

[0084] In some embodiments, the high voltage interlock detection method further includes the following steps:

[0085] When the detection results are reported to the cloud server, the corresponding component failure information is also reported.

[0086] Specifically, for detection within a reasonable range, normal communication detection, and undervoltage detection, component fault information (indicating which high-voltage component is abnormal) can be generated and reported to the cloud server together with the detection results to guide after-sales service to locate the faulty component. There is no restriction on the reporting method.

[0087] It should be noted that the steps shown in the above process or the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that here. The above modules can be functional modules or program modules, which can be implemented by software or hardware. For modules implemented by hardware, the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0088] In this embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0089] Optionally, the computer device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0090] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0091] S1, performing low voltage detection on the low voltage interlocking circuit to obtain a first detection state;

[0092] S2, obtaining the voltage state corresponding to each high-voltage component, and determining the detection result of the high-voltage interlock according to the voltage state and the first detection state.

[0093] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementation modes, and will not be repeated in this embodiment.

[0094] In addition, in combination with the high-voltage interlock detection method provided in the above embodiments, a storage medium may be provided in this embodiment to implement the method. The storage medium stores a computer program; when the computer program is executed by a processor, any high-voltage interlock detection method in the above embodiments is implemented.

[0095] It should be understood that the specific embodiments described herein are only used to explain the application, rather than to limit it. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of this application.

[0096] Obviously, the drawings are only some examples or embodiments of the present application. For ordinary technicians in the field, the present application can also be applied to other similar situations based on these drawings without creative work. In addition, it is understandable that although the work done in this development process may be complicated and lengthy, for ordinary technicians in the field, certain changes in design, manufacturing or production based on the technical content disclosed in this application are only conventional technical means and should not be regarded as insufficient content disclosed in this application.

[0097] The term "embodiment" in this application refers to a specific feature, structure or characteristic described in conjunction with the embodiment that can be included in at least one embodiment of the present application. The appearance of this phrase in various locations in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. It is clearly or implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.

[0098] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of patent protection. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the attached claims.

Claims

1. A high voltage interlock detection method, characterized in that: Applicable to a high-voltage interlock detection system, the high-voltage interlock detection system comprises: a vehicle controller and various high-voltage components; a low-voltage interlock circuit is formed by the controller and a low-voltage interlock wiring harness; each of the high-voltage components is connected in series in the low-voltage interlock circuit through the low-voltage interlock wiring harness; the controller is respectively connected to each of the high-voltage components; the method comprises: Performing a low-voltage detection on the low-voltage interlocking circuit to obtain a first detection state; The voltage state corresponding to each of the high-voltage components is acquired, and the detection result of the high-voltage interlock is determined according to the voltage state and the first detection state.

2. The high voltage interlock detection method according to claim 1, characterized in that: Performing a low voltage detection on the low voltage interlocking circuit to obtain a first detection state includes: The detection signal is received by the receiving end of the controller; the detection signal is sent by the sending end of the controller and flows through the low voltage interlocking circuit; The received detection signal is compared with a preset signal threshold to obtain a first detection state.

3. The high voltage interlock detection method according to claim 1, characterized in that: The high-voltage component is one or more of a power battery, a front drive motor, a rear drive motor, an electric compressor, an on-board charger, an on-board DC / DC converter and an air conditioner.

4. The high voltage interlock detection method according to any one of claims 1 to 3, characterized in that: Acquiring a voltage state corresponding to each of the high-voltage components, and determining a detection result of the high-voltage interlock according to the voltage state and the first detection state, including: When the vehicle is not powered by high voltage, determining a detection result of the high voltage interlock according to the first detection state; When high voltage is applied to the vehicle, a voltage state corresponding to each of the high voltage components is obtained, and a detection result of the high voltage interlock is determined according to the voltage state and the first detection state.

5. The high voltage interlock detection method according to claim 4, characterized in that: When the vehicle is powered on with high voltage, obtaining a voltage state corresponding to each of the high voltage components, and determining a detection result of the high voltage interlock according to the voltage state and the first detection state, including: When high voltage is applied to the vehicle, the voltage state corresponding to each high voltage component is obtained to perform high voltage detection. If the first detection state is other low voltage interlock faults, the other low voltage interlock faults are reported to the cloud server as the detection result. If the hood is detected to be open, the instrument of the vehicle is controlled to give an audible and visual alarm, and the high voltage power supply is cut off. During the high-voltage detection process, if the voltage state of the power battery in the high-voltage component is abnormal communication or abnormal voltage; then other high-voltage interlock faults are generated and reported to the cloud server as the detection result; at this time, if the first detection state is an open circuit fault of the low-voltage interlock, the instrument of the vehicle is controlled to give an audible and visual alarm, and the power supply of the high-voltage electricity is cut off after the vehicle speed is less than a preset speed threshold; if the first detection state is a normal low-voltage interlock or other low-voltage interlock faults, and the engine hood is detected to be opened, the instrument of the vehicle is controlled to give an audible and visual alarm, and the power supply of the high-voltage electricity is cut off; During the high-voltage detection process, if the voltage status of each of the high-voltage components except the power battery is communication abnormality or voltage abnormality; then the high-voltage interlock other faults are generated and reported to the cloud server as the detection result; at this time, if the first detection status is a low-voltage interlock open circuit fault, the vehicle's instrument is controlled to give an audible and visual alarm, and the high-voltage power supply is cut off after the vehicle speed is less than a preset speed threshold; if the first detection status is that the low-voltage interlock is normal or the low-voltage interlock other faults, and the engine hood is detected to be opened, the vehicle's instrument is controlled to give an audible and visual alarm, and the high-voltage power supply is cut off after the vehicle speed is less than the preset speed threshold; During the high-voltage detection process, if the voltage state of each of the high-voltage components is normal, and the ratio of the high-voltage side voltage corresponding to each of the high-voltage components to the reference voltage of the power battery meets the preset detection conditions, a high-voltage interlock open circuit fault is generated as the detection result and reported to the cloud server, and the vehicle's instrument is controlled to give an audible and visual alarm, and the high-voltage power supply is cut off after the vehicle speed is less than the preset speed threshold.

6. The high voltage interlock detection method according to claim 5, characterized in that: The method further comprises: After the detection result of the high-voltage interlock open-circuit fault is reported to the cloud server, locking and cutting off the power supply of the high-voltage electricity; After receiving a clear instruction from the diagnostic instrument of the vehicle, the detection result is restored to normal and the lock is released.

7. The high voltage interlock detection method according to claim 5, characterized in that: The method further comprises: When the detection result is reported to the cloud server, the corresponding component failure information is also reported.

8. A high voltage interlock detection system, characterized in that: include: A controller and various high-voltage components of a vehicle; a low-voltage interlocking circuit is formed by the controller and the low-voltage interlocking harness; Each of the high-voltage components is connected in series in the low-voltage interlocking circuit through the low-voltage interlocking harness; the controller is connected to each of the high-voltage components respectively; The controller is used to execute the high-voltage interlock detection method according to any one of claims 1 to 7.

9. A computer device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps of the high-voltage interlock detection method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the high-voltage interlock detection method according to any one of claims 1 to 7 are implemented.

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