WO2021197434A1

WO2021197434A1 - Method and system for determining connection reliability of vehicle high-voltage loop

Info

Publication number: WO2021197434A1
Application number: PCT/CN2021/084980
Authority: WO
Inventors: 郭腾飞; 李岩; 孟伟
Original assignee: 长城汽车股份有限公司
Priority date: 2020-04-01
Filing date: 2021-04-01
Publication date: 2021-10-07
Also published as: CN112677768B; CN112677768A

Abstract

A method for determining a connection reliability of a vehicle high-voltage loop. The vehicle high-voltage loop comprises a power battery management system, and a power consumption component connected in parallel to the power battery management system. The method comprises: calculating a first difference value between a working voltage of the power consumption component and an output voltage of the power battery management system (S201); calculating a wiring harness voltage corresponding to a high-voltage wiring harness between the power consumption component and the power battery management system (S202); and when the first difference value is not matched with the wiring harness voltage, determining that the vehicle high-voltage loop is in a virtual connection (S203). Also disclosed are a system for determining the connection reliability of the vehicle high-voltage loop, a computer processing device, a computer program, and a computer-readable medium. The method can detect the connection reliability of the high-voltage loop and determine whether a virtual connection exists.

Description

Method and system for determining connection reliability of vehicle high-voltage circuit

Cross-references to related applications

This disclosure requires the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 202010249524.X, and the title is "Method and System for Determining the Connection Reliability of Vehicle High-Voltage Circuits" on April 1, 2020, and the entire content of which is approved Reference is incorporated in this disclosure.

Technical field

The present disclosure relates to the field of vehicle technology, and in particular, to a method and system for determining the connection reliability of a high-voltage circuit of a vehicle.

Background technique

The new energy vehicle is mainly powered by a power battery, and the components of the vehicle are connected in parallel with the power battery, and their connections are generally fixed by bolts. The loosening of the bolts will cause the virtual connection of the joints, which will cause the joints to continue to heat up. In severe cases, it will cause thermal runaway and cause the vehicle to catch fire.

Summary of the invention

In view of this, the present disclosure aims to propose a method and system for determining the connection reliability of the high-voltage circuit of a vehicle, so as to realize the detection of the reliability of the connection of the high-voltage circuit and determine whether there is a virtual connection.

In order to achieve the above objective, the technical solution of the present disclosure is achieved as follows:

A method for determining the connection reliability of a high-voltage circuit of a vehicle, the high-voltage circuit of the vehicle including a power battery management system and an electric component connected in parallel with the power battery management system, the method comprising: calculating the The first difference between the operating voltage and the output voltage of the power battery management system; calculate the wiring harness voltage corresponding to the high-voltage wiring harness between the power-consuming component and the power battery management system; and When the difference does not match the wiring harness voltage, it is determined that the vehicle high-voltage circuit has a virtual connection.

Preferably, the calculating the wiring harness voltage corresponding to the high-voltage wiring harness between the electric component and the power battery management system includes: obtaining the corresponding high-voltage wiring harness between the electric component and the power battery management system And calculating the wiring harness voltage based on the wiring harness impedance and the working current.

Preferably, after determining that the vehicle high-voltage circuit has a virtual connection, the method for determining the connection reliability of the vehicle high-voltage circuit further includes: calculating a virtual connection resistance value corresponding to the virtual connection in the vehicle high-voltage circuit; Obtain a comparison result between the resistance value of the virtual connection resistance and the resistance threshold value corresponding to the separation of two adjacent virtual connection fault levels; and determine the current virtual connection fault corresponding to the resistance value of the virtual connection resistance according to the comparison result grade.

Preferably, the determining the current virtual connection fault level corresponding to the resistance value of the virtual connection resistance according to the current comparison result includes: when the comparison result shows that the resistance value of the virtual connection resistance is less than or equal to the resistance threshold value , Determining that the first failure level is used as the current virtual connection failure level, wherein the first failure level is configured to control the vehicle to perform at least one of the following steps: issuing a first prompt indicating that the first level failure exists Information, limiting the driving power of the vehicle to below a preset safe power threshold, reducing the temperature of the virtual connection to below the preset safe temperature threshold, and issuing a second prompt message for prompting the user to perform maintenance; and /Or when the comparison result shows that the resistance value of the virtual connection resistance is greater than the resistance threshold, it is determined that a second fault level is used as the current virtual connection fault level, wherein the second fault level is configured to control the vehicle Perform at least one of the following steps: send out a third prompt message indicating that the second-level fault exists, stop and power off, and send out a fourth prompt message for prompting the user to perform maintenance immediately.

In addition, this embodiment also provides a system for determining the connection reliability of a high-voltage circuit of a vehicle. The high-voltage circuit of the vehicle includes a power battery and electrical components connected in parallel with the power battery. The system includes: a difference calculation unit , Used to calculate the first difference between the working voltage of the electrical component and the output voltage of the power battery; a wiring harness voltage calculation unit, used to calculate the high voltage line between the electrical component and the power battery A wiring harness voltage corresponding to the harness; and a virtual connection judging unit for judging that the vehicle high-voltage circuit has a virtual connection when the first difference does not match the wiring harness voltage.

Preferably, the wiring harness voltage calculation unit includes: an impedance current acquisition module for acquiring the wiring harness impedance corresponding to the high-voltage wiring harness between the electrical component and the power battery and the operating current of the electrical component; and The wiring harness voltage calculation module is configured to calculate the wiring harness voltage based on the wiring harness impedance and the working current.

Preferably, the system further includes: a virtual connection resistance value calculation unit, configured to calculate the virtual connection resistance value corresponding to the virtual connection in the vehicle high voltage circuit after the judgment that the vehicle high voltage circuit has a virtual connection; The comparison result obtaining unit is configured to obtain a comparison result between the resistance value of the virtual connection resistance and the resistance threshold value corresponding to the separation of two adjacent virtual connection fault levels; and a failure level determining unit is configured to obtain the comparison result according to the comparison result Determine the current virtual connection fault level corresponding to the resistance value of the virtual connection resistance.

Preferably, the fault level determining unit includes: a first fault level determining module, configured to determine that the first fault level is used when the comparison result shows that the resistance value of the virtual connection resistance is less than or equal to the resistance threshold value The current virtual connection failure level, wherein the first failure level is configured to control the vehicle to perform at least one of the following steps: issuing a first prompt message indicating that the first level failure exists, and restricting the vehicle's driving The power is below the preset safe power threshold, the temperature at the virtual connection is reduced to below the preset safe temperature threshold, and the second prompt message for prompting the user to perform maintenance is issued; and/or the second fault level determination module When the comparison result shows that the resistance value of the virtual connection resistance is greater than the resistance threshold, it is determined that the second failure level is used as the current virtual connection failure level, wherein the second failure level is configured to control the vehicle to execute At least one of the following steps: sending out a third prompt message indicating that the second-level fault exists, stopping and powering off, and sending out a fourth prompt message for prompting the user to perform maintenance immediately.

Preferably, the electrical component includes any one of the following: a motor controller, an electric heater, an on-board DC converter, and an electric compressor.

In addition, this embodiment also provides a machine-readable storage medium having instructions stored on the machine-readable storage medium for causing a machine to execute the above-mentioned method for determining the connection reliability of a high-voltage circuit of a vehicle.

Compared with the prior art, the method for determining the connection reliability of the high-voltage circuit of a vehicle according to the present disclosure can determine whether there is a virtual connection in the high-voltage circuit of the vehicle according to the matching condition of the first difference and the wiring harness voltage, That is, in the case that the first difference value does not match the wiring harness voltage, it is determined that there is a virtual connection in the high-voltage circuit of the vehicle, so as to avoid the occurrence of safety accidents caused by the virtual connection in the high-voltage circuit of the vehicle.

Other features and advantages of the present disclosure will be described in detail in the following specific embodiments.

Description of the drawings

The drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure, and the exemplary embodiments and descriptions of the present disclosure are used to explain the present disclosure, and do not constitute an improper limitation of the present disclosure. In the attached picture:

FIG. 1 is a block diagram of the connection block diagram of the power supply circuit module composed of the high-voltage system of the whole vehicle according to the embodiment of the disclosure;

2 is a flowchart of the method for determining the connection reliability of the high-voltage circuit of a vehicle according to an embodiment of the disclosure;

Fig. 3 is a flowchart of a method for calculating a wiring harness voltage according to an embodiment of the present disclosure;

FIG. 4 is a logic flow chart of processing after a virtual connection exists in the high-voltage circuit of the vehicle according to the embodiment of the present disclosure; and

5 is a block diagram of the module connection of the system for determining the connection reliability of the high-voltage circuit of a vehicle according to an embodiment of the present disclosure;

Fig. 6 schematically shows a block diagram of a computing processing device for executing the method according to the present disclosure; and

Fig. 7 schematically shows a storage unit for holding or carrying program codes for implementing the method according to the present disclosure.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments These are a part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other if there is no conflict.

The high-voltage circuit of the vehicle is a power supply circuit composed of the high-voltage system of the entire vehicle. Component, wherein the electrical component may be any one of a motor controller (MCU, Motor Control Unit), an electric heater PTC, an on-board DC converter DCDC, and an electric compressor CMP. As shown in Fig. 1, the MCU is used to drive the driving motor M to move. In the following embodiments of the present disclosure, for convenience of description, an MCU will be used as an example for description.

Example 1

Fig. 2 is a flowchart of a method for determining the connection reliability of a high-voltage circuit of a vehicle according to the first embodiment. As shown in Figure 2, the method includes:

S201: Calculate a first difference between the _{working voltage V 1 of} the MCU and the output voltage V _{0 of the power battery management system.}

Wherein, the power battery management system is shown in Figure 1, which is composed of multiple power batteries connected in series and their connected peripheral circuits. The peripheral circuits include a main positive relay, a precharge relay, a precharge resistor, a current sensor, and a main Negative relay. Wherein, the precharge relay and the precharge resistor are connected in series, and are connected in parallel with the main positive relay to the positive end of the power battery; the current sensor is connected in series with the main negative relay and connected to the power The negative terminal of the battery. Output voltage V ₀ of the battery management system can be obtained by a first voltmeter. The working voltage V ₁ of the MCU is the voltage value divided by the MCU in parallel on both sides of the power battery, which can be measured by assuming that the second voltmeters on both sides of the MCU are measured. Then, the first difference V ₂ _{between the working voltage V 1} of the MCU and the output voltage V _{0 of} the power battery management system obtained by the above measurement is calculated, and the specific calculation formula is as shown in (1):

V ₂ ＝V ₀ -V ₁ (1)

S202: Calculate the wiring harness voltage corresponding to the high-voltage wiring harness between the MCU and the power battery management system.

Wherein, the wiring harness voltage is the voltage occupied by the high-voltage wiring harness, which is expressed as the loss of the electrical energy output by the power battery management system on the line.

Preferably, Fig. 3 is a calculation method of the wiring harness voltage. As shown in Figure 3, it includes:

S301: Obtain the wiring harness impedance corresponding to the high-voltage wiring harness between the MCU and the power battery management system and the working current of the MCU.

Wherein, the wiring harness impedance corresponding to the high-voltage wiring harness is the impedance r of the high-voltage wiring harness from the power battery management system to the MCU in a normal state (without virtual connection), for example, the wiring harness impedance r=10mΩ. The working current of the MCU is the current value I ₁ flowing through the MCU.

S302: Calculate the wiring harness voltage based on the wiring harness impedance and the operating current. Specifically, using Ohm's theorem to calculate the wiring harness voltage, the specific calculation formula is:

Harness voltage=r×I ₁ (2).

S203: When the first difference value does not match the wiring harness voltage, it is determined that there is a virtual connection in the high-voltage circuit of the vehicle.

Wherein, in this embodiment, the matching of the first difference and the wiring harness voltage indicates that the first difference is equal to the wiring harness voltage, which proves that there is no virtual connection in the high-voltage circuit of the vehicle and the high-voltage wiring harness is normal. In addition, this embodiment mainly focuses on related operations performed when the first difference does not match the wiring harness voltage, that is, the first difference is greater than the wiring harness voltage. Once there is a mismatch, it indicates that the vehicle There is a virtual connection in the high-voltage circuit. The virtual connection can exist at point A as shown in Figure 1, but it can also exist in other positions of the circuit.

In the embodiment of the present disclosure, once a virtual connection occurs, it indicates that the high-voltage circuit has a certain potential safety hazard, as shown in FIG. 4, based on this, the embodiment further has the following improvements.

S401: After determining that there is a virtual connection in the high-voltage circuit of the vehicle, calculate the resistance value of the virtual connection resistance corresponding to the virtual connection in the high-voltage circuit of the vehicle.

Wherein, the resistance value of the virtual connection resistance actually includes the high-voltage wiring harness impedance and the virtual connection resistance R. In this embodiment, the calculation formula is as shown in (3) below.

R=V ₂ /I ₁ (3);

S402, obtaining the result of comparison between the virtual access _a resistor and converting virtual access point fault level threshold value corresponding to the resistance R.

Wherein, the resistance threshold R ₁ can be one or more. In the case of multiple resistance thresholds, it can be considered that the virtual connection failure level is set to multiple, and each resistance threshold represents two adjacent virtual connections. The resistance value at the fault level divider. For ease of description in the present disclosure, in the following embodiments, only one resistance threshold is set.

S403: Determine the current virtual connection fault level corresponding to the resistance value of the virtual connection resistance according to the comparison result.

In the case that the virtual connection resistance threshold is set to one, the current virtual connection failure level corresponds to two, which are the first virtual connection failure level, that is, the low failure level, and the second virtual connection failure level, that is, the high failure level. , The virtual connection resistance threshold refers to the resistance value at the separation between the low fault level and the high fault level.

In this embodiment, it is further preferred that there are different current virtual connection failure levels corresponding to different comparison results, and then the relevant steps corresponding to the current virtual connection failure levels are executed, as described in detail as follows:

1. When the comparison result shows that the virtual connection resistance value R≤the resistance threshold value R1, it is determined that the low fault level is used as the current virtual connection fault level. In the low fault level, it is determined that the virtual connection is not serious, and the driving can continue, and at the same time, the vehicle is controlled to perform at least one of the following steps: sending out the first prompt message indicating that the first level fault exists, For example, through the indicator on the dashboard or through the on-board voice playback unit to play the voice about "there is a low-level fault with virtual connection"; limit the driving power of the vehicle below the preset safe power threshold, and limit the vehicle The driving power of the vehicle in turn avoids that the vehicle output power is too high and the heat at the virtual connection is too high. The safe power can be selected according to the actual situation, or it can be set according to the calculated virtual connection resistance, such as preset The corresponding relationship between the resistance value range and the safe power value, the safe power value corresponding to the resistance value range where the virtual resistance value is located, and the safe power value is used as the safe power threshold. The above method can be better Satisfying the user's driving experience does not cause overheating; reducing the temperature of the virtual connection to below a preset safe temperature threshold, the cooling method can be achieved by the above-mentioned setting of the safe power value, or an external device can be used to achieve cooling; A second prompt message for prompting the user to perform maintenance is issued. The second prompt message is similar to the first prompt message, and can be indicated through the indicator on the dashboard or through the on-board voice playback unit. "Connect" voice playback.

2. When the comparison result shows that R>R1, it is determined that the high fault level is used as the current virtual connection fault level. In the high failure level, it is determined that the virtual connection is serious and it is not possible to continue driving. At this time, the vehicle is controlled to perform at least one of the following steps that are compatible with the high failure level: The third prompt information of the second level fault, for example, through the indicator on the dashboard or through the on-board voice player unit to play the voice about "there is a high-level fault with virtual connection"; stop and power off, that is, stop driving the said Vehicles; send out the fourth prompt message for prompting the user to perform maintenance immediately. The fourth prompt message can be a display lamp indication or a language playback unit to play related languages, for example, "the virtual connection failure is serious, and immediate maintenance is required." .

Through the above-mentioned embodiments, the reliability of the high-voltage circuit connection is judged based on the matching of the calculation results. In the case that the calculated first difference does not match the wiring harness voltage, it is judged that there is a virtual connection, and the relationship between the two is determined. The difference value determines the severity of the virtual connection condition, and controls the vehicle to perform associated operations according to the control logic corresponding to the fault level matched by the difference value to avoid ablation of the high-voltage wiring harness due to the virtual connection, and then Ensure the safety of automobiles and vehicles.

Example 2

FIG. 5 is a block diagram of the module connection of a system for determining the connection reliability of the high-voltage circuit of a vehicle according to the second embodiment.

As shown in FIG. 5, the vehicle high-voltage circuit includes a power battery and electrical components connected in parallel with the power battery, and the system for determining the connection reliability of the vehicle high-voltage circuit includes: a difference calculation unit 1 for calculating The first difference between the working voltage of the electrical component and the output voltage of the power battery; the wiring harness voltage calculation unit 2 is used to calculate the corresponding high-voltage wiring harness between the electrical component and the power battery And a virtual connection judging unit 3 for judging that the vehicle high-voltage circuit has a virtual connection when the first difference does not match the wiring harness voltage.

Preferably, the wiring harness voltage calculation unit 2 includes: an impedance current acquisition module 21 for acquiring the wiring harness impedance corresponding to the high-voltage wiring harness between the electrical component and the power battery and the operating current of the electrical component And a wiring harness voltage calculation module 22 for calculating the wiring harness voltage based on the wiring harness impedance and the operating current.

Preferably, the system further includes: a virtual connection resistance value calculation unit 4, which is used to calculate the virtual connection resistance value corresponding to the virtual connection in the vehicle high voltage circuit after the judgment that the vehicle high voltage circuit has a virtual connection The comparison result obtaining unit 5 is used to obtain the comparison result between the resistance value of the virtual connection resistance and the resistance threshold values corresponding to the two adjacent virtual connection fault level separation locations; and the fault level determination unit 6 is used to obtain the comparison result according to the The comparison result determines the current virtual connection fault level corresponding to the resistance value of the virtual connection resistance.

Preferably, the fault level determining unit includes: a first fault level determining module 61, configured to determine the first fault level when the comparison result shows that the resistance value of the virtual connection resistance is less than or equal to the resistance threshold As the current virtual connection failure level, the first failure level is configured to control the vehicle to perform at least one of the following steps: issuing a first prompt message indicating that the first level failure exists, restricting the vehicle The driving power is below the preset safe power threshold, the temperature at the virtual connection is reduced to below the preset safe temperature threshold, and the second prompt message for prompting the user to perform maintenance is issued; and/or the second fault level is determined Module 62, when the comparison result shows that the resistance of the virtual connection resistance is greater than the resistance threshold, determine that a second fault level is used as the current virtual connection fault level, wherein the second fault level is configured to control the The vehicle performs at least one of the following steps: sending out a third prompt message indicating that the second-level fault exists, stopping and powering off, and sending out a fourth prompt message for prompting the user to immediately perform maintenance.

Wherein, the system for determining the connection reliability of the high-voltage circuit of the vehicle has the same or similar technical solutions and technical effects as those in the first embodiment compared with the prior art, which will not be repeated here.

In other embodiments, the system for determining the connection reliability of the high-voltage circuit of a vehicle includes a processor and a memory, and the execution steps of the method for determining the connection reliability of the high-voltage circuit of a vehicle are stored in the memory as a program unit and executed by the processor. The above-mentioned program units stored in the memory implement the corresponding functions.

The processor contains the kernel, and the kernel calls the corresponding program unit from the memory. One or more kernels can be set, and the connection reliability of the high-voltage circuit of the vehicle can be determined by adjusting the kernel parameters.

The memory may include non-permanent memory in computer-readable media, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM), and the memory includes at least one Memory chip.

The embodiment of the present disclosure provides a machine-readable storage medium having instructions stored on the machine-readable storage medium, and the instructions are used to make a machine execute the above-mentioned method for determining the connection reliability of a high-voltage circuit of a vehicle.

The embodiment of the present disclosure provides a processor, the processor is used to run a program, wherein the method for determining the connection reliability of a high-voltage circuit of a vehicle is executed when the program is running.

The present application also provides a computer program product, which when executed on a data processing device, is suitable for executing a program that initializes the steps of the method for determining the connection reliability of the vehicle's high-voltage circuit with the electric motor in the first embodiment.

Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

This application is described with reference to flowcharts and/or block diagrams of methods, devices (systems), and computer program products according to embodiments of this application. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are used to generate It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. The instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

The various component embodiments of the present disclosure may be implemented by hardware, or by software modules running on one or more processors, or by a combination of them. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in the computing processing device according to the embodiments of the present disclosure. The present disclosure can also be implemented as a device or device program (for example, a computer program and a computer program product) for executing part or all of the methods described herein. Such a program for realizing the present disclosure may be stored on a computer-readable medium, or may have the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

For example, FIG. 6 shows a computing processing device that can implement the method according to the present disclosure. The computing processing device traditionally includes a processor 1010 and a computer program product in the form of a memory 1020 or a computer readable medium. The memory 1020 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), EPROM, hard disk, or ROM. The memory 1020 has a storage space 1030 for executing program codes 1031 of any method steps in the above methods. For example, the storage space 1030 for program codes may include various program codes 1031 respectively used to implement various steps in the above method. These program codes can be read from or written into one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards, or floppy disks. Such a computer program product is usually a portable or fixed storage unit as described with reference to FIG. 7. The storage unit may have storage segments, storage spaces, etc., arranged similarly to the memory 1020 in the computing processing device of FIG. 6. The program code can be compressed in an appropriate form, for example. Generally, the storage unit includes computer-readable code 1031', that is, code that can be read by a processor such as 1010, which, when run by a computing processing device, causes the computing processing device to execute the method described above. The various steps.

The memory may include non-permanent memory in a computer readable medium, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

Computer-readable media includes permanent and non-permanent, removable and non-removable media, and information storage can be realized by any method or technology. The information can be computer readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical storage, Magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media can be used to store information that can be accessed by computing devices. According to the definition in this article, computer-readable media does not include transitory media, such as modulated data signals and carrier waves.

It should also be noted that the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or equipment including a series of elements includes not only those elements, but also Other elements that are not explicitly listed, or also include elements inherent to such processes, methods, commodities, or equipment. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, method, commodity or equipment that includes the element.

The “one embodiment”, “an embodiment” or “one or more embodiments” referred to herein means that a specific feature, structure or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present disclosure. In addition, please note that the word examples "in one embodiment" here do not necessarily all refer to the same embodiment.

In the instructions provided here, a lot of specific details are explained. However, it can be understood that the embodiments of the present disclosure may be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail, so as not to obscure the understanding of this specification.

In the claims, any reference signs placed between parentheses should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of multiple such elements. The present disclosure can be realized by means of hardware including several different elements and by means of a suitably programmed computer. In the unit claims listing several devices, several of these devices can be embodied by the same hardware item. The use of the words first, second, and third, etc. do not indicate any order. These words can be interpreted as names.

The above are only examples of the application, and are not used to limit the application. For those skilled in the art, this application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the scope of the claims of this application.

Claims

A method for determining the connection reliability of a high-voltage circuit of a vehicle, wherein the high-voltage circuit of the vehicle includes a power battery management system and an electric component connected in parallel with the power battery management system, and the method includes:

Calculating the first difference between the working voltage of the electric component and the output voltage of the power battery management system;

Calculate the wiring harness voltage corresponding to the high-voltage wiring harness between the electrical component and the power battery management system; and

When the first difference does not match the wiring harness voltage, it is determined that there is a virtual connection in the high-voltage circuit of the vehicle.
The method for determining the connection reliability of a high-voltage circuit of a vehicle according to claim 1, wherein the calculating the wiring harness voltage corresponding to the high-voltage wiring harness between the electrical component and the power battery management system comprises:

Acquiring the wiring harness impedance corresponding to the high-voltage wiring harness between the electrical component and the power battery management system and the operating current of the electrical component; and

The wiring harness voltage is calculated based on the wiring harness impedance and the operating current.
The method for determining the connection reliability of the high-voltage circuit of a vehicle according to claim 1, wherein after said determining that the vehicle high-voltage circuit has a virtual connection, the method for determining the connection reliability of the high-voltage circuit of the vehicle further comprises :

Calculate the resistance value of the virtual connection resistance corresponding to the virtual connection in the high-voltage circuit of the vehicle;

Obtaining a comparison result between the resistance value of the virtual connection resistance and the resistance threshold value corresponding to the separation location of two adjacent virtual connection fault levels; and

The current virtual connection fault level corresponding to the resistance value of the virtual connection resistance is determined according to the comparison result.
The method for determining the connection reliability of a high-voltage circuit of a vehicle according to claim 3, wherein the determining the current virtual connection fault level corresponding to the virtual connection resistance value according to the current comparison result comprises:

When the comparison result shows that the resistance of the virtual connection resistance is less than or equal to the resistance threshold, it is determined that the first failure level is used as the current virtual connection failure level, wherein the first failure level is configured to control the vehicle Perform at least one of the following steps: send out the first prompt message indicating that the first-level fault exists, limit the driving power of the vehicle below a preset safe power threshold, and reduce the temperature at the virtual connection to a preset value. Below the set safe temperature threshold, issue a second prompt message for prompting the user to perform maintenance; and/or

When the comparison result shows that the resistance value of the virtual connection resistance is greater than the resistance threshold value, it is determined that the second failure level is used as the current virtual connection failure level, wherein the second failure level is configured to control the vehicle to perform the following At least one of the steps: sending out a third prompt message indicating that the second-level fault exists, stopping and powering off, and sending out a fourth prompt message for prompting the user to perform maintenance immediately.
A system for determining the connection reliability of a high-voltage circuit of a vehicle, wherein the high-voltage circuit of the vehicle includes a power battery and an electric component connected in parallel with the power battery, and the system includes:

A difference calculation unit for calculating the first difference between the working voltage of the electrical component and the output voltage of the power battery;

A wiring harness voltage calculation unit for calculating the wiring harness voltage corresponding to the high-voltage wiring harness between the electrical component and the power battery; and

The virtual connection judging unit is used for judging that there is a virtual connection in the high-voltage circuit of the vehicle when the first difference does not match the wiring harness voltage.
The system for determining the connection reliability of the high-voltage circuit of a vehicle according to claim 5, wherein the wiring harness voltage calculation unit comprises:

The impedance current acquisition module is used to acquire the wiring harness impedance corresponding to the high-voltage wiring harness between the electrical component and the power battery and the operating current of the electrical component; and

The wiring harness voltage calculation module is configured to calculate the wiring harness voltage based on the wiring harness impedance and the working current.
The system for determining the connection reliability of the high-voltage circuit of a vehicle according to claim 5, wherein the system further comprises:

The virtual connection resistance value calculation unit is configured to calculate the virtual connection resistance value corresponding to the virtual connection location in the vehicle high voltage circuit after the judgment that the vehicle high voltage circuit has a virtual connection;

The comparison result obtaining unit is configured to obtain the comparison result between the resistance value of the virtual connection resistance and the resistance threshold value corresponding to the virtual connection fault level change point; and

The fault level determining unit is configured to determine the current fault level of the virtual connection corresponding to the resistance value of the virtual connection resistance according to the comparison result.
The system for determining the connection reliability of the high-voltage circuit of a vehicle according to claim 7, wherein the failure level determining unit comprises:

The first fault level determination module is configured to determine that the first fault level is the current virtual connection fault level when the comparison result shows that the resistance value of the virtual connection resistance is less than or equal to the resistance threshold. The fault level is configured to control the vehicle to perform at least one of the following steps: send out a first prompt message indicating that the first level fault exists, limit the driving power of the vehicle below a preset safe power threshold, and reduce The temperature at the virtual connection is below a preset safe temperature threshold, and a second prompt message for prompting the user to perform maintenance is issued; and/or

The second fault level determining module, when the comparison result shows that the resistance value of the virtual connection resistance is greater than the resistance threshold, determine that the second fault level is used as the current virtual connection fault level, wherein the second fault level is configured In order to control the vehicle, at least one of the following steps is performed: sending out a third prompt message indicating that the second-level fault exists, stopping and powering off, and sending out a fourth prompt message for prompting the user to perform maintenance immediately.
The system for determining the connection reliability of the high-voltage circuit of a vehicle according to claim 5, wherein the electrical component includes any one of the following: a motor controller, an electric heater, an on-board DC converter, and an electric compressor .
A computing processing device, characterized in that it comprises:

A memory in which computer readable codes are stored; and

One or more processors, when the computer-readable code is executed by the one or more processors, the computing processing device executes the determination of the high-voltage circuit of the vehicle according to any one of claims 1 to 4 Method of connection reliability.
A computer program, comprising computer readable code, which when the computer readable code runs on a computing processing device, causes the computing processing device to execute the determination of the vehicle high voltage circuit according to any one of claims 1 to 4 The method of connection reliability.
A computer readable medium in which the computer program according to claim 11 is stored.