CN111751686B - Method and device for detecting insulation fault of electric automobile - Google Patents

Method and device for detecting insulation fault of electric automobile Download PDF

Info

Publication number
CN111751686B
CN111751686B CN202010651786.9A CN202010651786A CN111751686B CN 111751686 B CN111751686 B CN 111751686B CN 202010651786 A CN202010651786 A CN 202010651786A CN 111751686 B CN111751686 B CN 111751686B
Authority
CN
China
Prior art keywords
fault
insulation
preset threshold
mode
judgment result
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010651786.9A
Other languages
Chinese (zh)
Other versions
CN111751686A (en
Inventor
于春洋
许立超
荣常如
刘轶鑫
马腾翔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FAW Group Corp
Original Assignee
FAW Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FAW Group Corp filed Critical FAW Group Corp
Priority to CN202010651786.9A priority Critical patent/CN111751686B/en
Publication of CN111751686A publication Critical patent/CN111751686A/en
Priority to PCT/CN2021/104873 priority patent/WO2022007822A1/en
Application granted granted Critical
Publication of CN111751686B publication Critical patent/CN111751686B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/005—Testing of electric installations on transport means
    • G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses a method and a device for detecting an insulation fault of an electric automobile, wherein the method comprises the following steps: acquiring a current working mode of the electric automobile, and determining a system to be detected needing to detect the insulation fault based on the working mode; collecting the insulation resistance value of a system to be detected; comparing the insulation resistance value with a preset threshold corresponding to the current working mode of the electric automobile, and judging whether an insulation fault occurs or not to obtain a first judgment result; if the first judgment result is that the insulation fault occurs, further judging whether the insulation fault is a serious fault or a slight fault to obtain a second judgment result; and selecting a corresponding fault treatment measure for treatment based on the second judgment result. The method and the device have the advantages that whether the electric automobile is in the insulation fault or not at present can be determined according to the preset threshold value correspondingly set in the current working mode of the electric automobile, the severity of the insulation fault is determined, and therefore different fault treatment measures are taken to treat the fault.

Description

Method and device for detecting insulation fault of electric automobile
Technical Field
The embodiment of the invention relates to the technical field of electric automobiles, in particular to a method and a device for detecting insulation faults of an electric automobile.
Background
The existing insulation detection method for the electric automobile mostly adopts a dual-resistor method recommended by national standards, and is generally realized in a BMS (battery management system). In the method, resistors with known resistance values are connected in parallel between a positive electrode and a negative electrode of a battery and a vehicle body ground, and the insulation resistance value is calculated through the voltage change between the positive electrode and the negative electrode of the battery before and after the parallel connection to the ground; this method has three limitations, one is that it must be detected in the presence of battery power; secondly, if the insulation performance of the whole system is detected, specific fault devices cannot be distinguished, and the current general method is that the same fault alarming and processing strategy is adopted for all fault conditions.
In addition, the direct current charging condition is not considered in the insulation detection method of the electric automobile at the present stage, in the direct current charging process, the BMS monitors the insulation of the whole system, if the insulation resistance value of the system is lower than a preset threshold value due to the insulation problem of the direct current charging pile, the BMS records the threshold value, the starting failure is caused when the direct current charging pile is electrified next time, and the function failure of the whole automobile is caused due to the external charging pile problem.
Disclosure of Invention
The invention provides a method and a device for detecting an insulation fault of an electric automobile, which can determine whether the electric automobile has the insulation fault at present and the severity of the insulation fault according to a preset threshold value correspondingly set in a current working mode of the electric automobile, thereby achieving the technical effect of adopting different fault treatment measures to treat.
The embodiment of the invention provides a method for detecting an insulation fault of an electric automobile, which comprises the following steps:
acquiring a current working mode of the electric automobile, and determining a system to be detected, which needs to detect the insulation fault, based on the working mode;
collecting the insulation resistance value of the system to be detected;
comparing the insulation resistance value with a preset threshold corresponding to the current working mode of the electric automobile, and judging whether an insulation fault occurs or not to obtain a first judgment result;
if the first judgment result is that the insulation fault occurs, further judging whether the insulation fault is a serious fault or a slight fault to obtain a second judgment result;
and selecting a corresponding fault treatment measure for treatment based on the second judgment result.
Further, the acquiring the current working mode of the electric vehicle comprises:
after a controller of a battery management system of the electric automobile is started, acquiring a main relay state, a charging relay state and a charging gun connection state;
if the main relay is disconnected, the charging relay is disconnected and the charging gun is not connected, the electric automobile is currently in a battery mode;
if the main relay is closed, the charging relay is disconnected and the charging gun is not connected, the electric automobile is currently in a finished automobile mode;
and when the main relay is closed, the charging relay is closed and the charging gun is connected, the electric automobile is currently in a quick charging mode.
Further, the system to be detected for determining that an insulation fault needs to be detected based on the operating mode includes:
if the current mode of the electric automobile is the battery mode, the system to be detected is a power battery;
if the current mode of the electric automobile is the whole automobile mode, the system to be detected is a whole automobile high-voltage system;
and if the current mode of the electric automobile is the quick charging mode, the system to be detected is a whole automobile high-voltage system and a charging pile system.
Further, when the working mode is a battery mode, the comparing the insulation resistance value with a preset threshold corresponding to the current working mode of the electric vehicle determines whether an insulation fault occurs, and obtaining a first determination result includes:
comparing the insulation resistance value with a first preset threshold value, and if the insulation resistance value is smaller than the first preset threshold value, determining that an insulation fault occurs according to a first judgment result;
if the first judgment result is that the insulation fault occurs, further judging whether the insulation fault is a serious fault or a slight fault, and obtaining a second judgment result comprises:
comparing the insulation resistance value with a second preset threshold value, and if the insulation resistance value is smaller than the second preset threshold value, determining that the insulation fault is a serious fault according to the second judgment result, wherein the second preset threshold value is smaller than the first preset threshold value;
if the insulation resistance value is greater than the second preset threshold value and less than the first preset threshold value, the second judgment result is that the insulation fault is a slight fault.
Further, when the working mode is a finished automobile mode, comparing the insulation resistance value with a preset threshold corresponding to the current working mode of the electric automobile, and judging whether an insulation fault occurs, wherein the step of obtaining a first judgment result comprises the following steps:
comparing the insulation resistance value with a third preset threshold value, and if the insulation resistance value is smaller than the third preset threshold value, determining that an insulation fault occurs according to the first judgment result;
if the first judgment result is that the insulation fault occurs, further judging whether the insulation fault is a serious fault or a slight fault, and obtaining a second judgment result comprises:
comparing the insulation resistance value with a fourth preset threshold value, and if the insulation resistance value is smaller than the fourth preset threshold value, determining that the insulation fault is a serious fault according to the second judgment result, wherein the fourth preset threshold value is smaller than the third preset threshold value;
if the insulation resistance value is greater than the fourth preset threshold value and less than the third preset threshold value, the second judgment result is that the insulation fault is a slight fault.
Further, when the working mode is the fast charging mode, the insulation resistance value is compared with a preset threshold corresponding to the current working mode of the electric vehicle, whether an insulation fault occurs is judged, and a first judgment result is obtained and includes:
comparing the insulation resistance value with a fifth preset threshold value, and if the insulation resistance value is smaller than the fifth preset threshold value, determining that an insulation fault occurs according to the first judgment result;
if the first judgment result is that the insulation fault occurs, further judging whether the insulation fault is a serious fault or a slight fault, and obtaining a second judgment result comprises:
comparing the insulation resistance value with a sixth preset threshold value, and if the insulation resistance value is smaller than the sixth preset threshold value, determining that the insulation fault is a serious fault according to the second judgment result;
if the insulation resistance value is greater than the sixth preset threshold value and less than the fifth preset threshold value, the second determination result is that the insulation fault is a slight fault.
Further, when the operating mode is a battery mode or a vehicle mode, the selecting a corresponding fault handling measure for handling based on the second determination result includes:
if the second judgment result shows that the insulation fault is a serious fault, selecting at least one fault treatment measure from the following measures to treat the fault: charging, electrifying and instrument prompting are forbidden;
if the second judgment result is that the insulation fault is a slight fault, selecting at least one fault treatment measure from the following measures to treat the fault: displaying power and instrument prompts;
when the working mode is the quick charging mode, selecting a corresponding fault handling measure for handling based on the second judgment result comprises:
if the second judgment result is that the insulation fault is a serious fault, stopping charging, but not locking up the fault code and also not saving the insulation resistance value;
and if the second judgment result is that the insulation fault is a slight fault, returning a prompt message of 'abnormal insulation of the charging pile, please use carefully' to the user.
Further, when the working mode is a battery mode or a vehicle mode,
if the second determination result indicates that the insulation fault is a serious fault, the method further includes:
storing a fault flag of the insulation fault;
reporting the insulation fault to a vehicle controller when the system to be detected is electrified again, and storing a working mode when the fault occurs in a fault snapshot;
if the second determination result is that the insulation fault is a minor fault, the method further includes:
storing a fault code of the insulation fault;
and storing the working mode when the fault occurs in the fault snapshot, and re-detecting whether the insulation fault exists or not when the power is on again.
Further, when the operating mode is the battery mode, after selecting the corresponding fault handling measure for handling based on the second determination result, the method further includes: and detecting whether the insulation fault detection process is finished or not, if so, entering a dormant state, and if not, keeping the fault detection state.
The embodiment of the invention also provides a device for detecting the insulation fault of the electric automobile, which comprises:
the system comprises a determining module, a judging module and a judging module, wherein the determining module is used for acquiring the current working mode of the electric automobile and determining a system to be detected, which needs to detect the insulation fault, based on the working mode;
the acquisition module is used for acquiring the insulation resistance value of the system to be detected;
the first judgment module is used for comparing the insulation resistance value with a preset threshold corresponding to the current working mode of the electric automobile and judging whether insulation fault occurs or not to obtain a first judgment result;
the second judgment module is used for further judging whether the insulation fault is a serious fault or a slight fault if the first judgment result indicates that the insulation fault occurs, so as to obtain a second judgment result;
and the processing module is used for selecting a corresponding fault processing measure to process based on the second judgment result.
The invention discloses a method and a device for detecting an insulation fault of an electric automobile, wherein the method comprises the following steps: acquiring a current working mode of the electric automobile, and determining a system to be detected needing to detect the insulation fault based on the working mode; collecting the insulation resistance value of a system to be detected; comparing the insulation resistance value with a preset threshold corresponding to the current working mode of the electric automobile, and judging whether an insulation fault occurs or not to obtain a first judgment result; if the first judgment result is that the insulation fault occurs, further judging whether the insulation fault is a serious fault or a slight fault to obtain a second judgment result; and selecting a corresponding fault treatment measure for treatment based on the second judgment result. The preset threshold values of different insulation resistance values are set in different working modes of the electric automobile, so that whether the electric automobile has insulation faults or not at present and the severity of the insulation faults can be determined according to the preset threshold values correspondingly set in the current working mode of the electric automobile, and the technical effect of taking different fault treatment measures to treat the faults is achieved.
Drawings
Fig. 1 is a flowchart of an electric vehicle insulation fault detection method according to an embodiment of the present invention;
FIG. 2 is a block diagram of a system to be tested that is provided in three dimensions in accordance with the practice of the present invention;
FIG. 3 is a schematic view illustrating the operation modes of the electric vehicle according to the embodiment of the present invention;
FIG. 4 is a timing diagram illustrating various operating modes of an electric vehicle according to an embodiment of the present invention;
fig. 5 is a structural diagram of an insulation fault detection apparatus for an electric vehicle according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the accompanying drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or in combination with each other, and the embodiments of the present invention are not limited in this respect.
Fig. 1 is a flowchart of an electric vehicle insulation fault detection method according to an embodiment of the present invention.
As shown in fig. 1, the method for detecting the insulation fault of the electric vehicle specifically comprises the following steps:
step S101, acquiring a current working mode of the electric automobile, and determining a system to be detected, which needs to detect the insulation fault, based on the working mode.
Specifically, the working modes of the electric automobile comprise a battery mode, a whole automobile mode and a quick charging mode; when the working mode is a battery mode, the insulation resistance value of the power battery needs to be detected, namely the system to be detected is the power battery; when the working mode is a finished automobile mode, the insulation resistance value of a finished automobile high-voltage system needs to be detected, namely the system to be detected is the finished automobile high-voltage system; when the working mode is the quick charging mode, the insulation resistance of the whole vehicle high-voltage system and the charging pile system needs to be detected, namely the system to be detected is the whole vehicle high-voltage system and the charging pile system.
Optionally, in step S101, the step of acquiring the current operating mode of the electric vehicle specifically includes the following steps:
step S1, after a controller of a battery management system of the electric automobile is started, a main relay state, a charging relay state and a charging gun connection state are obtained.
Specifically, the battery management system BMS may determine a current operation mode of the electric vehicle according to a main relay state, a charge relay state, and a connection state of the charge gun. Fig. 2 is a structural diagram of a system to be tested provided by a practical solid of the present invention, wherein the main relay includes a main positive relay and a main negative relay, and the charging relay includes a charging positive relay and a charging negative relay, it should be noted that the position of the charging relay shown in fig. 2 is only schematic, and it can also be directly connected to the power battery terminal. Fig. 3 is a schematic diagram illustrating the interconversion between the operating modes of the electric vehicle according to the embodiment of the present invention.
And S2, if the main relay is disconnected, the charging relay is disconnected and the charging gun is not connected, the electric automobile is currently in a battery mode.
Referring to fig. 2 and 3, when the main relay is turned off, the charging relay is turned off, and the charging gun is not connected, that is, when the whole vehicle is powered off, the insulation resistance value detected by the battery management system BMS is the insulation resistance value of the battery itself, and the electric vehicle is in the battery mode at this time.
And S3, if the main relay is closed, the charging relay is disconnected and the charging gun is not connected, the electric automobile is currently in a finished automobile mode.
Referring to fig. 2 and 3, when the main relay is closed, the charging relay is disconnected and the charging gun is not connected, that is, when the whole vehicle is started (the relay is closed and the high voltage is powered on), the insulation resistance of the whole high voltage system is detected by the BMS, and at this time, the electric vehicle is in a whole vehicle mode.
And S4, closing the main relay, closing the charging relay and connecting the charging gun, so that the electric automobile is in a quick charging mode at present.
Referring to fig. 2 and 3, when the main relay is closed, the charging relay is closed and the charging gun is connected, the insulation resistance value detected by the BMS is the insulation resistance value common to the whole vehicle high-voltage system and the charging pile system, and at this time, the electric vehicle is in a quick charging mode.
Optionally, in step S101, determining, based on the operating mode, that the system to be detected needs to detect the insulation fault includes: if the current mode of the electric automobile is a battery mode, the system to be detected is a power battery; if the current mode of the electric automobile is a finished automobile mode, the system to be detected is a finished automobile high-voltage system; and if the current mode of the electric automobile is the quick charging mode, the system to be detected is a whole automobile high-voltage system and a charging pile system.
Specifically, referring to fig. 3, if the electric vehicle is currently in the battery mode, the insulation resistance value detected by the BMS is the insulation resistance value of the battery itself, and the system to be detected is a power battery; if the electric automobile is currently in a finished automobile mode, the BMS detects the insulation resistance value of the whole high-voltage system, and the system to be detected is the finished automobile high-voltage system; if the electric automobile is in the mode of filling soon, what BMS detected is the common insulation resistance of whole car high voltage system and two systems of charging pile system, and the system that detects is whole car high voltage system and charging pile system.
And S102, collecting the insulation resistance value of the system to be detected.
After the current working mode of the electric automobile is determined and the corresponding system to be detected is determined based on the working mode, the insulation resistance value of the system to be detected is collected, and whether the electric automobile has an insulation fault or not is judged based on the collected insulation resistance value.
Step S103, comparing the insulation resistance value with a preset threshold corresponding to the current working mode of the electric automobile, and judging whether an insulation fault occurs or not to obtain a first judgment result.
And step S104, if the first judgment result is that the insulation fault occurs, further judging whether the insulation fault is a serious fault or a slight fault, and obtaining a second judgment result.
And step S105, selecting a corresponding fault handling measure to handle based on the second judgment result.
Specifically, the determination of the preset threshold value is that, from the perspective of the battery pack, the normal resistance value is generally above 20M Ω, and once the resistance value is smaller than, for example, 1M Ω, it can be considered that a related abnormal condition occurs, and the processing is to be performed, so that in the battery mode, the threshold value standards can be selected to be 5M Ω and 1M Ω; from the point of electric shock of people, the safety requirements of electric automobiles according to the national standard 18384.3-2015 part 3 are commonly used at present: the related requirements in the electric shock protection of personnel, therefore, when the whole vehicle mode is adopted, two threshold value standards of 100 omega/V and 500 omega/V can be selected, and different preset threshold values are specifically set in consideration of the detection precision. In the embodiment of the invention, different preset thresholds are set according to different working modes, so that fine control is realized in a more appropriate mode, and the purposes of early warning and ensuring the safety of the electric automobile are achieved.
Specifically, according to different preset threshold values set in different working modes, whether an insulation fault occurs in the working mode is judged first, and a first judgment result is obtained. And when the first judgment result is that the insulation fault occurs, further judging whether the insulation fault occurring in the working mode is a slight fault or a serious fault based on a preset threshold value to obtain a second judgment result, and selecting a corresponding fault measure according to the second judgment result for processing.
This application is through setting up different insulating resistance value and predetermine the threshold value under electric automobile's different mode, realized can confirming whether electric automobile takes place insulation fault at present according to the preset threshold value that electric automobile current mode corresponds the setting to and the severity of insulation fault takes place, thereby take different fault handling measures to carry out the technological effect handled.
Optionally, when the working mode is the battery mode or the entire vehicle mode, the step S105 of selecting a corresponding fault handling measure for handling based on the second determination result specifically includes: if the second judgment result shows that the insulation fault is a serious fault, selecting at least one fault treatment measure from the following measures to treat the fault: charging, electrifying and instrument prompting are forbidden; if the second judgment result is that the insulation fault is a slight fault, selecting at least one fault treatment measure from the following measures to treat the fault: displaying power and instrument prompts;
when the working mode is the fast charging mode, step S105, selecting a corresponding fault handling measure for handling based on the second determination result specifically includes: if the second judgment result is that the insulation fault is a serious fault, stopping charging, but not storing the fault code and the insulation resistance value; and if the second judgment result is that the insulation fault is a slight fault, returning a prompt message of 'abnormal insulation of the charging pile, please use carefully' to the user.
Optionally, when the working mode is the battery mode or the entire vehicle mode, if the second determination result indicates that the insulation fault is a serious fault, the method for detecting the insulation fault of the electric vehicle further includes the following steps: storing a fault flag of the insulation fault; and reporting the insulation fault to the vehicle control unit when the system to be detected is electrified again, and storing the working mode when the fault occurs in the fault snapshot. If the second judgment result shows that the insulation fault is a slight fault, the method for detecting the insulation fault of the electric vehicle further comprises the following steps: storing a fault code of the insulation fault; and storing the working mode when the fault occurs in the fault snapshot, and re-detecting whether the insulation fault exists or not when the power is on again.
In the embodiment of the invention, different preset thresholds can be set according to different working modes, and different fault treatment measures are selected for treatment according to the severity of the insulation fault in different working modes.
Specifically, when the working mode is the battery mode or the vehicle mode, if the second judgment result is a serious fault, fault processing measures such as charging prohibition, power-on prohibition, instrument prompt and the like are selected for processing, in addition, a fault mark of the insulation fault is stored in a nonvolatile memory, the insulation fault is reported to the vehicle controller by the battery management system BMS after the next power-on, the working mode when the fault occurs is stored in a fault snapshot, and after the serious fault is checked by professional maintenance personnel and the fault is eliminated, the fault code is eliminated by equipment (such as a diagnostic instrument) and then the equipment can be recovered.
When the working mode is a battery mode or a whole vehicle mode, if the second judgment result is a slight fault, fault treatment measures such as power display, instrument prompt and the like are selected for treatment, in addition, fault codes are also saved, historical faults are not reported, the working mode of the fault occurrence moment is recorded in the fault snapshot, the faults are conveniently checked after sale, and whether the insulation faults exist or not is detected again when the power is on again.
When the working mode is a quick charging mode, if the second judgment result is a serious fault, a fault treatment measure for stopping charging is carried out, but the fault code is not locked and the insulation resistance value is not stored; if the second judgment result is that the insulation fault is a slight fault, a prompt message of 'abnormal insulation of the charging pile, please use carefully' is returned to the user, the working mode of the moment when the fault occurs is recorded in the fault snapshot, the fault code is only stored for troubleshooting after sale, and the historical fault is not reported when the whole vehicle is powered on next time, but whether the insulation fault exists is detected again.
Optionally, when the working mode is the battery mode, in step S103, comparing the insulation resistance value with a preset threshold corresponding to the current working mode of the electric vehicle, and determining whether an insulation fault occurs, where obtaining the first determination result specifically includes: comparing the insulation resistance value with a first preset threshold value, and if the insulation resistance value is smaller than the first preset threshold value, determining that an insulation fault occurs according to a first judgment result;
step S104, if the first determination result is that the insulation fault occurs, further determining whether the insulation fault is a serious fault or a slight fault, and obtaining a second determination result specifically includes: comparing the insulation resistance value with a second preset threshold value, and if the insulation resistance value is smaller than the second preset threshold value, determining that the insulation fault is a serious fault according to a second judgment result, wherein the second preset threshold value is smaller than the first preset threshold value; if the insulation resistance value is larger than the second preset threshold value and smaller than the first preset threshold value, the second judgment result is that the insulation fault is a slight fault.
Specifically, in the battery mode, a two-stage insulation fault preset threshold value is set, which can be set according to the insulation resistance value of the power battery in an abnormal state, such as considering the abrasion of a wire harness or the insulation state when water enters a battery pack. The first preset threshold R1 may be set to 5M Ω, and the second preset threshold R2 may be set to 1M Ω.
Comparing the collected insulation resistance value of the power battery with a first preset threshold value R1, and if the collected insulation resistance value of the power battery is greater than the first preset threshold value R1, judging that no insulation fault occurs according to a first judgment result; if the insulation resistance value is smaller than a first preset threshold value R1, the first judgment result is that an insulation fault occurs, and whether the insulation fault is a serious fault or a slight fault is further judged.
Comparing the collected insulation resistance value of the power battery with a second preset threshold value R2, and if the insulation resistance value is smaller than the second preset threshold value R2, determining that the second judgment result is a serious fault, wherein to ensure the detection accuracy, the comparison and confirmation need to be carried out for 3 periods, namely, the insulation resistance value is repeatedly collected and compared with the preset threshold value, and the final detection result is obtained after the steps are repeated for three times; when the second judgment result is a serious fault, fault processing such as charging prohibition, power-on prohibition, instrument prompt and the like is carried out, in addition, a fault mark of the insulation fault needs to be stored in a nonvolatile memory, the BMS reports the fault to the whole vehicle controller when the power is supplied again next time, and a battery mode at the fault occurrence time is recorded in a fault snapshot. It should be noted that, after the verification fault must be checked by professional maintenance personnel and the fault is eliminated, the verification fault can be recovered after the fault code is eliminated by using equipment (such as a diagnostic instrument).
If the insulation resistance value is larger than the second preset threshold value R2 and smaller than the first preset threshold value R1, that is, between R1 and R2, and the detection results are consistent after confirmation for 3 periods, the second judgment result is a minor fault, and at this time, fault processing such as power limitation, instrument prompt and the like needs to be performed, but the minor fault only stores a fault code, and a fault identifier does not need to be stored in a nonvolatile memory, and a history fault does not need to be reported, and only a battery mode at the fault occurrence moment needs to be recorded in a fault snapshot, so that after-sales troubleshooting of the fault is facilitated, and whether the insulation fault exists or not needs to be detected again at the next power-on.
Optionally, when the working mode is the entire vehicle mode, step S103 is performed to compare the insulation resistance value with a preset threshold corresponding to the current working mode of the electric vehicle, and determine whether an insulation fault occurs, where obtaining a first determination result specifically includes: comparing the insulation resistance value with a third preset threshold value, and if the insulation resistance value is smaller than the third preset threshold value, determining that an insulation fault occurs according to a first judgment result;
step S104, if the first determination result is that the insulation fault occurs, further determining whether the insulation fault is a serious fault or a slight fault, and obtaining a second determination result specifically includes: comparing the insulation resistance value with a fourth preset threshold value, and if the insulation resistance value is smaller than the fourth preset threshold value, determining that the insulation fault is a serious fault according to a second judgment result, wherein the fourth preset threshold value is smaller than a third preset threshold value; if the insulation resistance value is larger than the fourth preset threshold value and smaller than the third preset threshold value, the second judgment result is that the insulation fault is a slight fault.
Specifically, in the entire vehicle mode, two levels of preset threshold values of the insulation faults are set, and the preset threshold values in this mode can be set according to two threshold value standards of national standard 100 Ω/V and 500 Ω/V, and the detection accuracy is added, for example, for a BMS with 400V, the third preset threshold value R3 can be set to 270k Ω, and the fourth preset threshold value R4 can be set to 50k Ω.
Comparing the collected insulation resistance value of the whole vehicle high-voltage system with a third preset threshold value R3, and if the collected insulation resistance value is greater than the third preset threshold value R3, judging that no insulation fault occurs according to a first judgment result; if the insulation resistance value is smaller than a third preset threshold value R3, the first judgment result is that an insulation fault occurs, and whether the insulation fault is a serious fault or a slight fault is further judged.
Comparing the collected insulation resistance value of the whole vehicle high-voltage system with a fourth preset threshold value R4, and if the insulation resistance value is smaller than the fourth preset threshold value R4 and the detection results are consistent after the confirmation is carried out for 3 periods, determining that the second judgment result is a serious fault; at this time, it is necessary to perform fault processing such as charging prohibition, power-on prohibition, meter prompt, etc., and it is also necessary to store the fault flag of the insulation fault in the nonvolatile memory, report the fault to the vehicle controller by the BMS when the power is turned on again next time, and record the battery mode at the time of the fault occurrence in the fault snapshot. It should be noted that, after the verification fault must be checked by professional maintenance personnel and the fault is eliminated, the verification fault can be recovered after the fault code is eliminated by using equipment (such as a diagnostic instrument).
If the insulation resistance value is larger than the fourth preset threshold value R4 and smaller than the third preset threshold value R3 at this time, that is, between R3 and R4, and the detection results are consistent after confirming for 3 continuous cycles, the second judgment result is a minor fault, at this time, fault processing such as power limitation, instrument prompt and the like needs to be performed, but the minor fault only stores a fault code, does not need to store a fault identifier in a nonvolatile memory, does not need to report a historical fault, only needs to record a battery mode at the fault occurrence time in a fault snapshot, is convenient for troubleshooting the fault after sale, and needs to detect whether the insulation fault exists again when powering on next time.
Optionally, when the working mode is the fast charging mode, in step S103, comparing the insulation resistance value with a preset threshold corresponding to the current working mode of the electric vehicle, and determining whether an insulation fault occurs, where obtaining the first determination result specifically includes: comparing the insulation resistance value with a fifth preset threshold value, and if the insulation resistance value is smaller than the fifth preset threshold value, determining that an insulation fault occurs according to a first judgment result;
step S104, if the first determination result is that the insulation fault occurs, further determining whether the insulation fault is a serious fault or a slight fault, and obtaining a second determination result specifically includes: comparing the insulation resistance value with a sixth preset threshold value, and if the insulation resistance value is smaller than the sixth preset threshold value, determining that the insulation fault is a serious fault according to a second judgment result; if the insulation resistance value is larger than the sixth preset threshold value and smaller than the fifth preset threshold value, the second judgment result is that the insulation fault is a slight fault.
Specifically, in the fast charging mode, that is, when the electric vehicle is dc charged, the preset insulation fault threshold is also set to two levels, that is, a fifth preset threshold R5 and a sixth preset threshold R6.
Comparing the collected insulation resistance values of the whole vehicle high-voltage system and the charging pile system with a fifth preset threshold value R5, and if the insulation resistance values are larger than the fifth preset threshold value R5, judging that no insulation fault occurs according to a first judgment result; and if the insulation resistance value is smaller than a fifth preset threshold value R5, judging that the insulation fault occurs according to the first judgment result, and further judging whether the insulation fault is a serious fault or a slight fault.
Comparing the collected insulation resistance value with a sixth preset threshold value R6, if the insulation resistance value is reduced to be larger than the sixth preset threshold value R6 and smaller than a fifth preset threshold value R5, the second judgment result is a slight fault, and the battery management system BMS prompts a user: the fault code is only stored for troubleshooting after sale, and the insulation fault is not reported when the whole vehicle is electrified next time, but whether the insulation fault exists is detected again.
If the insulation resistance value is smaller than the sixth preset threshold value R6, the second judgment result is a serious fault, the battery management system BMS performs fault processing for terminating charging, but does not store the fault code and does not store the insulation resistance value, that is, after the fault is cleared and eliminated by a professional maintenance worker, the fault code is cleared by a device (such as a diagnostic instrument) and then the fault code can be recovered, and whether the insulation fault exists or not can not be redetected when the whole vehicle is powered on next time.
Optionally, when the operation mode is the battery mode, in step S105, after selecting a corresponding fault handling measure for handling based on the second determination result, the method for detecting an insulation fault of an electric vehicle further includes: and detecting whether the insulation fault detection process is finished or not, if so, entering a dormant state, and if not, keeping the fault detection state.
Fig. 4 is a timing chart of each operating mode of the electric vehicle according to the embodiment of the present invention.
Specifically, since the time for detecting the insulation fault is long, in order to ensure that the insulation fault detection process can still be successfully completed after the electric vehicle is powered down at a high voltage, the battery management system BMS still ensures that the insulation resistance of the power battery is correctly detected and then the power battery is in a sleep state, as shown in fig. 4, that is, when the operating mode is the battery mode, whether the insulation fault detection process is completed or not is detected, if the insulation fault detection process is completed, the controller of the battery management system BMS enters the sleep state, and if the insulation fault detection process is not completed, the controller of the battery management system BMS maintains the fault detection state, and the detection of the insulation fault is continuously completed.
The following describes the operation modes of the electric vehicle in a specific embodiment.
As shown in fig. 4, for an electric vehicle, when a key is inserted but IG-On (car ignition gear) is not started, the controller of the battery management system BMS is started, but the vehicle is not ignited, and the electric vehicle is in the battery mode; if the electric automobile is ignited in the battery mode, namely high voltage is applied to the automobile, the automobile enters the whole automobile mode, otherwise, the automobile is powered off, and the battery mode is entered again; if the charging gun is inserted in the battery mode, the electric automobile starts charging and enters a quick charging mode, otherwise, the charging gun is pulled out, and the battery mode is entered again; the entering of the whole vehicle mode and the working mode are triggered by user operation, such as ignition operation or charging gun insertion operation. After the whole vehicle is powered off (the user stops or stops charging), the user does not have related vehicle using requirements, and the BMS can enter a sleep mode in a delayed mode at the moment due to a long insulation detection period, and then enters the sleep mode after the insulation resistance detection of the battery is completed.
The embodiment of the invention also provides an electric vehicle insulation fault detection device, which is used for executing the electric vehicle insulation fault detection method provided by the embodiment of the invention.
Fig. 5 is a structural diagram of an insulation fault detection apparatus for an electric vehicle according to an embodiment of the present invention. As shown in fig. 5, the insulation fault detection device for an electric vehicle mainly includes: a determining module 51, an acquiring module 52, a first judging module 53, a second judging module 54, and a processing module 55, wherein:
the determining module 51 is configured to obtain a current working mode of the electric vehicle, and determine a system to be detected, which needs to detect the insulation fault, based on the working mode;
the acquisition module 52 is used for acquiring the insulation resistance value of the system to be detected after the system to be detected is determined;
the first judging module 53 is configured to compare the insulation resistance value with a preset threshold corresponding to a current working mode of the electric vehicle, and judge whether an insulation fault occurs, so as to obtain a first judgment result;
a second judging module 54, configured to further judge whether the insulation fault is a serious fault or a slight fault if the first judging result is that the insulation fault occurs, so as to obtain a second judging result;
and a processing module 55, configured to select a corresponding fault handling measure for processing based on the second determination result.
Optionally, the determining module 51 is specifically configured to obtain a main relay state, a charging relay state, and a charging gun connection state after a controller of a battery management system of the electric vehicle is started; if the main relay is disconnected, the charging relay is disconnected and the charging gun is not connected, the electric automobile is currently in a battery mode; if the main relay is closed, the charging relay is disconnected and the charging gun is not connected, the electric automobile is currently in a finished automobile mode; and when the main relay is closed, the charging relay is closed and the charging gun is connected, the electric automobile is currently in a quick charging mode.
Optionally, the determining module 51 is further specifically configured to: if the current mode of the electric automobile is a battery mode, determining that the system to be detected is a power battery; if the current mode of the electric automobile is a finished automobile mode, determining that the system to be detected is a finished automobile high-voltage system; and if the current mode of the electric automobile is the quick charging mode, determining that the system to be detected is a whole automobile high-voltage system and a charging pile system.
Optionally, when the operating mode is the battery mode, the first determining module 53 is specifically configured to: and comparing the insulation resistance value with a first preset threshold value, and if the insulation resistance value is smaller than the first preset threshold value, determining that an insulation fault occurs according to a first judgment result.
The second determination module 54 is specifically configured to: comparing the insulation resistance value with a second preset threshold value, and if the insulation resistance value is smaller than the second preset threshold value, determining that the insulation fault is a serious fault according to a second judgment result, wherein the second preset threshold value is smaller than the first preset threshold value; if the insulation resistance value is larger than the second preset threshold value and smaller than the first preset threshold value, the second judgment result is that the insulation fault is a slight fault.
Optionally, when the working mode is the vehicle finishing mode, the first determining module 53 is specifically configured to: and comparing the insulation resistance value with a third preset threshold value, and if the insulation resistance value is smaller than the third preset threshold value, determining that an insulation fault occurs according to a first judgment result.
The second determination module 54 is specifically configured to: comparing the insulation resistance value with a fourth preset threshold value, and if the insulation resistance value is smaller than the fourth preset threshold value, determining that the insulation fault is a serious fault according to a second judgment result, wherein the fourth preset threshold value is smaller than a third preset threshold value; if the insulation resistance value is larger than the fourth preset threshold value and smaller than the third preset threshold value, the second judgment result is that the insulation fault is a slight fault.
Optionally, when the working mode is the fast charging mode, the first determining module 53 is specifically configured to: and comparing the insulation resistance value with a fifth preset threshold value, and if the insulation resistance value is smaller than the fifth preset threshold value, determining that an insulation fault occurs according to a first judgment result.
The second determination module 54 is specifically configured to: comparing the insulation resistance value with a sixth preset threshold value, and if the insulation resistance value is smaller than the sixth preset threshold value, determining that the insulation fault is a serious fault according to a second judgment result; if the insulation resistance value is larger than the sixth preset threshold value and smaller than the fifth preset threshold value, the second judgment result is that the insulation fault is a slight fault.
Optionally, the processing module 55 is specifically configured to: if the second judgment result shows that the insulation fault is a serious fault, selecting at least one fault treatment measure from the following measures to treat the fault: charging, electrifying and instrument prompting are forbidden; if the second judgment result is that the insulation fault is a slight fault, selecting at least one fault treatment measure from the following measures to treat the fault: and displaying power and instrument prompt.
Optionally, the insulation fault detection device for an electric vehicle further includes:
the serious fault processing module is used for storing a fault mark of the insulation fault if the second judgment result shows that the insulation fault is the serious fault; and reporting the insulation fault to the vehicle control unit when the system to be detected is electrified again, and storing the working mode when the fault occurs in the fault snapshot.
The minor fault processing module is used for storing a fault code of the insulation fault if the second judgment result indicates that the insulation fault is the minor fault; and storing the working mode when the fault occurs in the fault snapshot, and re-detecting whether the insulation fault exists or not when the power is on again.
The device provided by the embodiment of the present invention has the same implementation principle and technical effect as the method embodiments, and for the sake of brief description, no mention is made in the system embodiments, and reference may be made to the corresponding contents in the method embodiments.
The method for detecting the insulation fault of the electric vehicle provided by the embodiment of the invention has the same technical characteristics as the device for detecting the insulation fault of the electric vehicle provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
The embodiment of the invention provides an electric automobile, which is characterized by comprising a battery management system for executing the electric automobile insulation fault detection method in any embodiment.
The electric vehicle provided by the embodiment of the present invention includes a battery management system for executing the method for detecting an insulation fault of an electric vehicle in the above embodiment, and therefore, the electric vehicle provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and details are not repeated herein.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (9)

1. An electric vehicle insulation fault detection method, characterized by comprising:
acquiring a current working mode of the electric automobile, and determining a system to be detected needing to detect the insulation fault based on the working mode;
collecting the insulation resistance value of the system to be detected;
comparing the insulation resistance value with a preset threshold corresponding to the current working mode of the electric automobile, and judging whether an insulation fault occurs or not to obtain a first judgment result;
if the first judgment result is that the insulation fault occurs, further judging whether the insulation fault is a serious fault or a slight fault to obtain a second judgment result;
selecting a corresponding fault handling measure to handle based on the second judgment result;
the acquiring of the current working mode of the electric vehicle comprises the following steps:
after a controller of a battery management system of the electric automobile is started, acquiring a main relay state, a charging relay state and a charging gun connection state;
if the main relay is disconnected, the charging relay is disconnected and the charging gun is not connected, the electric automobile is currently in a battery mode;
if the main relay is closed, the charging relay is disconnected and the charging gun is not connected, the electric automobile is currently in a finished automobile mode;
and when the main relay is closed, the charging relay is closed and the charging gun is connected, the electric automobile is currently in a quick charging mode.
2. The method of claim 1, wherein determining that a system to be detected requiring detection of an insulation fault based on the operating mode comprises:
if the current mode of the electric automobile is the battery mode, the system to be detected is a power battery;
if the current mode of the electric automobile is the whole automobile mode, the system to be detected is a whole automobile high-voltage system;
and if the current mode of the electric automobile is the quick charging mode, the system to be detected is a whole automobile high-voltage system and a charging pile system.
3. The method according to claim 1, wherein when the operation mode is a battery mode, the comparing the insulation resistance value with a preset threshold corresponding to the current operation mode of the electric vehicle to determine whether an insulation fault occurs, and obtaining a first determination result comprises:
comparing the insulation resistance value with a first preset threshold value, and if the insulation resistance value is smaller than the first preset threshold value, determining that an insulation fault occurs according to the first judgment result;
if the first judgment result is that the insulation fault occurs, further judging whether the insulation fault is a serious fault or a slight fault, and obtaining a second judgment result comprises:
comparing the insulation resistance value with a second preset threshold value, and if the insulation resistance value is smaller than the second preset threshold value, determining that the insulation fault is a serious fault according to the second judgment result, wherein the second preset threshold value is smaller than the first preset threshold value;
if the insulation resistance value is greater than the second preset threshold value and less than the first preset threshold value, the second judgment result is that the insulation fault is a slight fault.
4. The method according to claim 1, wherein when the working mode is a full vehicle mode, the comparing the insulation resistance value with a preset threshold corresponding to the current working mode of the electric vehicle to determine whether an insulation fault occurs, and obtaining a first determination result comprises:
comparing the insulation resistance value with a third preset threshold value, and if the insulation resistance value is smaller than the third preset threshold value, determining that an insulation fault occurs according to the first judgment result;
if the first judgment result is that the insulation fault occurs, further judging whether the insulation fault is a serious fault or a slight fault, and obtaining a second judgment result comprises:
comparing the insulation resistance value with a fourth preset threshold value, and if the insulation resistance value is smaller than the fourth preset threshold value, determining that the insulation fault is a serious fault according to the second judgment result, wherein the fourth preset threshold value is smaller than the third preset threshold value;
if the insulation resistance value is greater than the fourth preset threshold value and less than the third preset threshold value, the second judgment result is that the insulation fault is a slight fault.
5. The method according to claim 1, wherein when the operating mode is a fast charging mode, the comparing the insulation resistance value with a preset threshold corresponding to the current operating mode of the electric vehicle to determine whether an insulation fault occurs, and obtaining a first determination result includes:
comparing the insulation resistance value with a fifth preset threshold value, and if the insulation resistance value is smaller than the fifth preset threshold value, determining that an insulation fault occurs according to the first judgment result;
if the first judgment result is that the insulation fault occurs, further judging whether the insulation fault is a serious fault or a slight fault, and obtaining a second judgment result comprises:
comparing the insulation resistance value with a sixth preset threshold value, and if the insulation resistance value is smaller than the sixth preset threshold value, determining that the insulation fault is a serious fault according to the second judgment result;
if the insulation resistance value is greater than the sixth preset threshold value and less than the fifth preset threshold value, the second judgment result is that the insulation fault is a slight fault.
6. The method of claim 1,
when the working mode is a battery mode or a vehicle mode, selecting a corresponding fault handling measure for handling based on the second judgment result comprises:
if the second judgment result shows that the insulation fault is a serious fault, selecting at least one fault treatment measure from the following measures to treat the fault: charging, electrifying and instrument prompting are forbidden;
if the second judgment result is that the insulation fault is a slight fault, selecting at least one fault treatment measure from the following measures to treat the fault: displaying power and instrument prompts;
when the working mode is the fast charging mode, selecting a corresponding fault handling measure for handling based on the second judgment result comprises:
if the second judgment result is that the insulation fault is a serious fault, stopping charging, but not locking up the fault code and also not saving the insulation resistance value;
and if the second judgment result shows that the insulation fault is a slight fault, returning a prompt message of 'abnormal insulation of the charging pile, please use carefully' to the user.
7. The method of claim 1, wherein when the operating mode is a battery mode or a vehicle mode,
if the second determination result indicates that the insulation fault is a serious fault, the method further includes:
storing a fault flag of the insulation fault;
reporting the insulation fault to a vehicle controller when the system to be detected is electrified again, and storing a working mode when the fault occurs in a fault snapshot;
if the second determination result is that the insulation fault is a minor fault, the method further includes:
storing a fault code of the insulation fault;
and storing the working mode when the fault occurs in the fault snapshot, and re-detecting whether the insulation fault exists or not when the power is on again.
8. The method according to claim 1, wherein when the operation mode is a battery mode, after selecting a corresponding fault handling measure for handling based on the second determination result, the method further comprises: and detecting whether the insulation fault detection process is finished or not, if so, entering a dormant state, and if not, keeping the fault detection state.
9. An electric vehicle insulation fault detection device, characterized in that the device includes:
the system comprises a determining module, a judging module and a judging module, wherein the determining module is used for acquiring the current working mode of the electric automobile and determining a system to be detected, which needs to detect the insulation fault, based on the working mode;
the acquisition module is used for acquiring the insulation resistance value of the system to be detected;
the first judgment module is used for comparing the insulation resistance value with a preset threshold corresponding to the current working mode of the electric automobile and judging whether insulation fault occurs or not to obtain a first judgment result;
the second judgment module is used for further judging whether the insulation fault is a serious fault or a slight fault if the first judgment result indicates that the insulation fault occurs, so as to obtain a second judgment result;
the processing module is used for selecting a corresponding fault processing measure to process based on the second judgment result;
the determining module is specifically used for acquiring a main relay state, a charging relay state and a charging gun connection state after a controller of a battery management system of the electric automobile is started; if the main relay is disconnected, the charging relay is disconnected and the charging gun is not connected, the electric automobile is currently in a battery mode; if the main relay is closed, the charging relay is disconnected and the charging gun is not connected, the electric automobile is currently in a finished automobile mode; and when the main relay is closed, the charging relay is closed and the charging gun is connected, the electric automobile is currently in a quick charging mode.
CN202010651786.9A 2020-07-08 2020-07-08 Method and device for detecting insulation fault of electric automobile Active CN111751686B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202010651786.9A CN111751686B (en) 2020-07-08 2020-07-08 Method and device for detecting insulation fault of electric automobile
PCT/CN2021/104873 WO2022007822A1 (en) 2020-07-08 2021-07-07 Electric vehicle insulation fault detection method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010651786.9A CN111751686B (en) 2020-07-08 2020-07-08 Method and device for detecting insulation fault of electric automobile

Publications (2)

Publication Number Publication Date
CN111751686A CN111751686A (en) 2020-10-09
CN111751686B true CN111751686B (en) 2022-11-18

Family

ID=72709889

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010651786.9A Active CN111751686B (en) 2020-07-08 2020-07-08 Method and device for detecting insulation fault of electric automobile

Country Status (2)

Country Link
CN (1) CN111751686B (en)
WO (1) WO2022007822A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111751686B (en) * 2020-07-08 2022-11-18 中国第一汽车股份有限公司 Method and device for detecting insulation fault of electric automobile
CN113156304A (en) * 2020-10-16 2021-07-23 国电泉州热电有限公司 Switch equipment detection method and device
CN113009227B (en) * 2021-02-22 2023-07-18 福建星云电子股份有限公司 Insulation detection method for electric automobile
CN114839497B (en) * 2022-07-06 2022-11-11 中国重汽集团济南动力有限公司 Rapid insulation monitoring fault positioning system and method for electric automobile
CN116544537B (en) * 2023-07-03 2023-09-22 中国第一汽车股份有限公司 Battery device and vehicle with same

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105004979A (en) * 2015-08-12 2015-10-28 江苏德和新能源科技有限公司 System and method for detecting insulation of electric automobile DC charging pile
CN106274498A (en) * 2016-08-30 2017-01-04 奇瑞商用车（安徽）有限公司 The control method of cell management system of electric automobile
CN106379188A (en) * 2016-09-30 2017-02-08 华南理工大学 Energy management system for power battery of electric automobile and safety protection method
DE102015122128A1 (en) * 2015-12-17 2017-06-22 Bender Gmbh & Co. Kg Method and apparatus for advanced isolation fault detection in an ungrounded power system and method for condition monitoring of the power system
CN109116264A (en) * 2018-07-19 2019-01-01 深圳供电局有限公司 It is a kind of for diagnosing the device and method of charging pile failure
CN109435693A (en) * 2018-10-11 2019-03-08 恒大法拉第未来智能汽车（广东）有限公司 Electric automobile insulation failure monitoring method and device
CN110406424A (en) * 2019-07-11 2019-11-05 厦门金龙旅行车有限公司 A kind of new-energy automobile power battery all the period of time monitoring system and method
CN110884368A (en) * 2019-11-05 2020-03-17 江铃汽车股份有限公司 High-voltage control system and fault control method

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6637749B2 (en) * 2015-12-04 2020-01-29 株式会社デンソーテン Insulation abnormality detection device and insulation abnormality detection method
DE102017100345A1 (en) * 2017-01-10 2018-07-12 Borgward Trademark Holdings Gmbh Electric vehicle and insulation test method, insulation tester and insulation test system for an electric vehicle
CN106841962A (en) * 2017-02-24 2017-06-13 北京新能源汽车股份有限公司 A kind of high voltage component insulation detecting circuit and insulation detecting method
CN107020957B (en) * 2017-04-10 2020-02-07 重庆长安新能源汽车科技有限公司 Fault processing method and system of pure electric vehicle and pure electric vehicle
CN108839566A (en) * 2018-06-15 2018-11-20 威马智慧出行科技（上海）有限公司 Vehicle insulation fault processing method, storage medium and electronic equipment
CN110696619A (en) * 2018-07-09 2020-01-17 宝沃汽车（中国）有限公司 Insulation monitoring method and device for hybrid electric vehicle and hybrid electric vehicle
CN111114349B (en) * 2019-12-31 2021-09-21 中国第一汽车股份有限公司 Wireless charging method and system for electric automobile
CN111289857B (en) * 2020-03-12 2020-12-29 海南大学 On-line detection system for insulation state of vehicle-mounted high-voltage battery pack of electric vehicle
CN111751686B (en) * 2020-07-08 2022-11-18 中国第一汽车股份有限公司 Method and device for detecting insulation fault of electric automobile

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105004979A (en) * 2015-08-12 2015-10-28 江苏德和新能源科技有限公司 System and method for detecting insulation of electric automobile DC charging pile
DE102015122128A1 (en) * 2015-12-17 2017-06-22 Bender Gmbh & Co. Kg Method and apparatus for advanced isolation fault detection in an ungrounded power system and method for condition monitoring of the power system
CN106274498A (en) * 2016-08-30 2017-01-04 奇瑞商用车（安徽）有限公司 The control method of cell management system of electric automobile
CN106379188A (en) * 2016-09-30 2017-02-08 华南理工大学 Energy management system for power battery of electric automobile and safety protection method
CN109116264A (en) * 2018-07-19 2019-01-01 深圳供电局有限公司 It is a kind of for diagnosing the device and method of charging pile failure
CN109435693A (en) * 2018-10-11 2019-03-08 恒大法拉第未来智能汽车（广东）有限公司 Electric automobile insulation failure monitoring method and device
CN110406424A (en) * 2019-07-11 2019-11-05 厦门金龙旅行车有限公司 A kind of new-energy automobile power battery all the period of time monitoring system and method
CN110884368A (en) * 2019-11-05 2020-03-17 江铃汽车股份有限公司 High-voltage control system and fault control method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
纯电动汽车上下电及电池管理系统故障控制策略;田晟等;《华南理工大学学报(自然科学版)》;20160915(第09期);全文 *

Also Published As

Publication number Publication date
CN111751686A (en) 2020-10-09
WO2022007822A1 (en) 2022-01-13

Similar Documents

Publication Publication Date Title
CN111751686B (en) Method and device for detecting insulation fault of electric automobile
US7768266B2 (en) Vehicle battery monitor apparatus and method for detecting battery change
CN102511009B (en) Method for diagnosing the operation of a device for cutting off and connecting a battery from/to the onboard power network of a motor vehicle
US10804575B2 (en) Secondary battery system and method for diagnosing abnormality in battery pack
CN104521093B (en) Battery charging and maintenance with defective battery cell monitoring
EP2518522B1 (en) Battery pack failure detection device
US7852089B2 (en) Ground-fault detection system for vehicles with a high-voltage power net
US20130035819A1 (en) High-voltage system for a motor vehicle and method for diagnosing a high-voltage system for a motor vehicle
US20040130298A1 (en) Microprocessor controlled booster apparatus with polarity protection
US8269462B2 (en) State monitoring apparatus for assembled battery
EP2667207B1 (en) Charging apparatus and method for determining conduction state
US20160103188A1 (en) Method for monitoring the state of a battery in a motor vehicle
US11054476B2 (en) Method for monitoring a status of a battery, monitoring device and motor vehicle
US20140333315A1 (en) Monitoring system and vehicle
WO2011014758A1 (en) Monitoring battery health in an hvac system
CN112986826A (en) Method for detecting a load-dependent state of a vehicle component
US10836338B2 (en) Method and device for monitoring an energy reserve and safety device for a vehicle
CN108333516B (en) Battery state testing method and system
US20130054085A1 (en) Detection circuit for open or intermittent motor vehicle battery connection
CN113745672B (en) Battery self-heating control method, battery self-heating device, system and vehicle
JP4374982B2 (en) Storage battery deterioration determination device and storage battery provided with the same
KR100765830B1 (en) 42 volt electric power source system control method
CN112026583A (en) Method and system for detecting battery pack and vehicle
CN112213675A (en) Current sensor fault judgment method and device
CN114649792B (en) Emergency starting power supply short circuit protection method and system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant