CN114932807A - Fault processing method and fault processing system for electric vehicle power system - Google Patents

Fault processing method and fault processing system for electric vehicle power system Download PDF

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Publication number
CN114932807A
CN114932807A CN202210590774.9A CN202210590774A CN114932807A CN 114932807 A CN114932807 A CN 114932807A CN 202210590774 A CN202210590774 A CN 202210590774A CN 114932807 A CN114932807 A CN 114932807A
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fault
faults
vehicle
electric
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CN114932807B (en
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姜鹏翰
李想
赵开成
李畅
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FAW Group Corp
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FAW Group Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
    • B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
    • B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
    • B60R16/0234—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions related to maintenance or repairing of vehicles
    • 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
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention provides a fault processing method and a fault processing system for a power system of an electric vehicle. The fault processing method of the electric vehicle power system comprises the following steps: acquiring a vehicle state of the electric vehicle; the vehicle control unit diagnoses a plurality of actual faults generated by the electric vehicle according to the vehicle state; the vehicle control unit carries out a fault type division step on a plurality of actual faults, wherein the fault types comprise electric drive system faults, battery system faults and electric control system faults; the vehicle control unit divides a plurality of actual faults in each fault type into A-level faults, B-level faults and C-level faults according to fault severity, wherein the fault severity is as follows: the C-level fault is more than the B-level fault is more than the A-level fault; and the instrument controller receives a display instruction sent by the vehicle control unit so as to display the fault type and the fault grade. The technical scheme of the invention solves the problem of low system fault prompting efficiency on the instrument panel of the electric vehicle in the prior art.

Description

Fault processing method and fault processing system for electric vehicle power system
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a fault processing method and a fault processing system of an electric automobile power system.
Background
With the increasing number of electric elements of electric vehicles, more and more fault icons are needed to be diagnosed and displayed on the instrument, the fault prompt information of the new pure electric vehicle instrument reaches hundreds of times, and the fault prompt icons also reach dozens. In order to take into account the aesthetic coordination of the display style, the display area of the instrument reserved for the fault icon becomes increasingly narrow, and an obvious space crowding phenomenon occurs, so that the pressure of the display content of the instrument is increased, and the prompting efficiency of the system fault on the instrument panel is reduced.
Disclosure of Invention
The invention mainly aims to provide a fault processing method and a fault processing system of an electric vehicle power system, and aims to solve the problem that the system fault prompting efficiency on an instrument panel of an electric vehicle in the prior art is low.
In order to achieve the above object, the present invention provides a method for handling a fault of a power system of an electric vehicle, comprising: an acquisition step of acquiring a vehicle state of the electric vehicle; a fault diagnosis step of diagnosing a plurality of actual faults generated by the electric vehicle by the vehicle controller according to the vehicle state; the vehicle control unit carries out a fault type division step on a plurality of actual faults, wherein the fault types comprise electric drive system faults, battery system faults and electric control system faults; the vehicle control unit divides a plurality of actual faults in each fault type into a grade A fault, a grade B fault and a grade C fault according to the fault severity, wherein the fault severity is as follows: the C-level fault is more than the B-level fault is more than the A-level fault; and the instrument controller receives a display instruction sent by the vehicle control unit so as to display the fault type and the fault grade.
Further, after the grading step and before the displaying step, the fault handling method further comprises a first judging step of judging whether the electric drive system fault and the battery system fault exist simultaneously, if so, a combined fault step of grading a plurality of actual faults to different fault grades of the electric control system fault is performed, and if not, the displaying step is performed.
Further, the step of combining faults is as follows: when the electric drive system fault and the battery system fault are both A-level faults, dividing a plurality of actual faults into A-level faults of the electric control system faults; or when one of the electric drive system fault and the battery system fault is an A-level fault, the other one of the electric drive system fault and the battery system fault is a B-level fault, or both the electric drive system fault and the battery system fault are B-level faults, dividing the plurality of actual faults into the B-level faults of the electric control system fault; alternatively, when one of the electric drive system fault and the battery system fault is a class C fault, the plurality of actual faults are classified as class C faults of the electric control system fault.
Further, after the grading step and before the displaying step, the fault handling method further comprises the step that the vehicle control unit determines the type of the displayed icon according to the first prompting rule and the fault type, wherein the type of the icon comprises a battery system fault icon, an electric drive system fault icon and an electric control system fault icon.
Further, after the grading step and before the displaying step, the fault handling method further comprises a step of determining the type of the prompting characters according to the first prompting rule and the fault type by the vehicle control unit, wherein the character type comprises battery system fault prompting characters, electric driving system fault prompting characters and electric control system fault prompting characters.
Further, after the step of determining the character type and before the step of displaying, the fault processing method further comprises a step of determining the character level of the prompt character by the vehicle controller according to a second prompt rule, the prompt character type and the fault level.
Further, before determining the text type, after the step of ranking, the fault handling method further comprises the step of sending the most severe fault rank to the meter controller.
Further, after the fault diagnosis step and before the type division step, the fault processing method further comprises a step of forming a plurality of fault codes corresponding to the plurality of actual faults and reporting the fault codes stored in the fault codes.
According to another aspect of the present invention, the present invention provides a fault handling system for an electric vehicle, which is controlled by the above fault handling method for a power system of an electric vehicle, the fault handling system comprising: the acquisition module is used for acquiring the vehicle state; the vehicle control unit is used for carrying out fault type division on a plurality of actual faults and carrying out fault grade division according to fault severity, the fault types comprise electric drive system faults, battery system faults and electric control system faults, the fault grades comprise A-grade faults, B-grade faults and C-grade faults, and the fault severity is as follows: class C fault > class B fault > class A fault; and the instrument controller receives a display instruction sent by the vehicle control unit and is used for controlling the instrument panel to display the fault type and the fault grade.
Further, the fault handling system of the electric vehicle further comprises a storage unit, and the storage unit is used for storing a plurality of fault codes formed by a plurality of actual faults.
Compared with the prior art that the system faults are divided into six levels or more, the method provided by the invention divides a plurality of actual faults into electric driving system faults, battery system faults and electric control system faults, and simply divides the levels of the system faults into three levels according to the severity of the faults, so that a driver and maintenance personnel can clearly master the current severity of the faults, and the pressure of too many display contents of an instrument can be greatly relieved, thereby improving the prompting efficiency of the system faults on an instrument panel.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates a flow diagram of a method for fault handling in an electric vehicle powertrain in accordance with an embodiment of the present invention; and
fig. 2 shows another flow chart of the fault handling method of the electric vehicle power system of the embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It should be noted that the battery system is mainly composed of a battery management controller (BMS for short) and a battery body; the electric drive system mainly comprises a motor Management Controller (MCU) and a drive motor; the electric control system is a finished automobile electric control system and mainly comprises a controller (usually a finished automobile controller, VCU for short) responsible for diagnosing the driving safety of the finished automobile and various sensors. The electronic control system comprises all subsystems which possibly influence the driving running performance except for a battery and an electric drive, such as a braking system, an alternating current/direct current charging/discharging system, a wireless charging system, a driving mode adjusting system, a mortgage management main relay, a main chip power supply voltage, an alternating current/direct current charging port temperature and the like.
It should be noted that the controller responsible for diagnosing the driving safety of the whole vehicle may not necessarily be a VCU, but may also be other controllers with corresponding computing power, and the controller diagnoses the fault of the whole vehicle through data fed back by each other controller and the sensor, and performs fault processing, such as sending to an instrument controller to perform corresponding alarm prompts of characters, sounds and icons.
The controller capable of carrying the algorithm of the present invention, analyzing the signal, and determining and processing the failure, which has a certain calculation power, may be a "domain controller" that is created in the future, instead of the vehicle control unit described above.
It should be noted that, for a battery system fault and an electric drive system fault, both the BMS (battery management system) and the MCU (motor management controller) have self-detection capability of the fault, and both can classify the detected fault into a plurality of fault classes according to a specific classification standard.
As shown in fig. 1, an embodiment of the present invention provides a fault handling method for a power system of an electric vehicle. The fault processing method of the electric vehicle power system comprises the following steps: an acquisition step of acquiring a vehicle state of the electric vehicle; a fault diagnosis step of diagnosing a plurality of actual faults generated by the electric vehicle according to the vehicle state by the vehicle controller; the vehicle control unit carries out a type division step of dividing the fault types of a plurality of actual faults, wherein the fault types comprise an electric driving system fault, a battery system fault and an electric control system fault; the vehicle control unit divides a plurality of actual faults in each fault type into a grade A fault, a grade B fault and a grade C fault according to the fault severity, wherein the fault severity is as follows: the C-level fault is more than the B-level fault is more than the A-level fault; and the instrument controller receives a display instruction sent by the vehicle control unit so as to display the fault type and the fault grade.
In the technical scheme, compared with the prior art that the system faults are divided into six or more levels, the method and the device divide a plurality of actual faults into electric driving system faults, battery system faults and electric control system faults according to the current vehicle state of the electric vehicle, and simply divide the levels of the system faults into three levels according to the fault severity, so that a driver and a maintainer can clearly master the current fault severity, and the pressure of too many instrument display contents can be greatly relieved, so that the prompt efficiency of the system faults on an instrument panel is improved.
In the embodiment of the present invention, the class a fault, the class B fault, and the class C fault correspond to faults that do not need to be maintained immediately, faults that have power limitation and need to be repaired as soon as possible by being deferred to a 4S store, and faults that cannot be driven and need to be safely parked for rescue.
It should be noted that in the embodiment of the present invention, the electric drive system, the battery system and the electric control system have A, B, C levels for fault levels, and when the same letters appear, the fault levels do not represent the same fault, but only represent the same fault level, i.e., the same severity level.
It should be noted that, in the embodiment of the present invention, for fault levels in the same system (i.e. fault levels of the same fault type), the severity levels are, in order: class C > class B > class A.
Compared with the classification mode that the electric drive system fault and the battery system fault are mixed and organized into the system fault in the prior art, the method divides the system fault into three categories, including the electric drive system fault, the battery system fault and the electric control system fault. Therefore, the method is simple and clear, and a driver can conveniently control the fault type.
Preferably, in an embodiment of the present invention, the vehicle status mainly includes temperatures of the ac and dc charging ports, a status of the low voltage management relay, a power supply voltage of the main chip, a torque control function, and a wireless charging function. When a wireless charging (WOBC) fails, a VCU (vehicle control unit) reports an A-level fault. Of course, the present invention is not limited to this, and states such as the difference of the brake pedal or the accelerator pedal may be added according to actual conditions.
As shown in fig. 2, in the embodiment of the present invention, after the ranking step and before the displaying step, the fault handling method further includes a first judging step of judging whether the electric drive system fault and the battery system fault exist at the same time, if so, a merged fault step of ranking the plurality of actual faults to different fault ranks of the electric control system fault is performed, and if not, the displaying step is performed.
In the technical scheme, the probability that the general electric drive system and the battery system simultaneously have faults is low, when the situation occurs, the situation that the whole vehicle has a certain fault can be determined at a high probability, the simultaneous fault of the electric drive system and the battery system can be a derivative result of the fault, and an engineer of the electric drive system or an engineer of the battery system can not solve the fault independently.
In particular, in embodiments of the present invention, the displaying step may be performed after the merging the failure step.
Specifically, in the embodiment of the present invention, the step of merging faults is: when the electric drive system fault and the battery system fault are both A-level faults, the multiple actual faults are divided into A-level faults of the electric control system faults. Therefore, when the instrument panel displays the system fault, the fault of the electric control system and the grade of the fault of the electric control system can be only displayed, so that the squeezing phenomenon displayed by the instrument can be greatly relieved, and the fault can be conveniently positioned by maintenance personnel.
Specifically, in an embodiment of the present invention, when one of the electric drive system fault and the battery system fault is a class a fault, the other of the electric drive system fault and the battery system fault is a class B fault, or both the electric drive system fault and the battery system fault are class B faults, the plurality of actual faults are classified as class B faults of the electric control system faults. Therefore, when the instrument panel displays the system fault, the instrument panel can only display the electric control system fault and the grade of the electric control system fault, so that the squeezing phenomenon displayed by the instrument panel can be greatly relieved, and the fault can be conveniently positioned by maintenance personnel.
Specifically, in the embodiment of the invention, when one of the electric drive system fault and the battery system fault is the C-class fault, the plurality of actual faults are classified into the C-class fault of the electric control system fault. Therefore, when the instrument panel displays the system fault, the instrument panel can only display the electric control system fault and the grade of the electric control system fault, so that the squeezing phenomenon displayed by the instrument panel can be greatly relieved, and the fault can be conveniently positioned by maintenance personnel.
Preferably, the classification of the fault types and fault classes may be made according to table 1 for a variety of actual faults.
TABLE 1
Figure BDA0003667243460000051
It should be noted that table 1 is only used to explain a specific division rule of the method, and the multiple actual faults are sorted and classified to obtain the fault level of each fault type. The listed faults are only the examples of a certain quantity of vehicles, and when the specific vehicle types are different, the actual faults and the classification standards are adjusted.
It should be noted that, in the embodiment of the present invention, the signal sources for acquiring the faults of the electric drive system, the battery system and the electric control system are independent of each other, and the signal bits sent by the signal sources are mutually exclusive and do not intersect. Therefore, the system fault levels in table 1 are mutually exclusive and non-overlapping, i.e., the fault levels of the electric drive system, the battery system and the electric control system are respectively only one of A, B, C, and more than one fault level does not exist.
In an embodiment of the invention, as shown in fig. 2, after the grading step and before the displaying step, the fault handling method further includes the step that the vehicle control unit determines the type of the display icon according to the first prompting rule and the fault type, wherein the type of the icon includes a battery system fault icon, an electric drive system fault icon and an electric control system fault icon.
Through the arrangement, after various actual faults are classified and graded, the vehicle control unit can determine the type of the display icon to be displayed according to the first prompt rule, and the battery system fault icon, the electric drive system fault icon and the electric control system fault icon are respectively connected with the battery system fault, the electric drive system fault and the electric control system fault, so that the phenomenon of squeezing of instrument display can be greatly relieved.
Further, the positions of the three trouble icons are non-overlapping, that is, each icon occupies a certain display space regardless of whether it is lit or not lit. Like this, when many trouble coincidence, be favorable to the quick accurate locking trouble of maintenance personal to avoid dispersion driver's attention, thereby do benefit to driving safety.
As shown in fig. 2, in the embodiment of the present invention, after the grading step and before the displaying step, the fault handling method further includes a step of determining a text type of the prompt text by the vehicle controller according to the first prompt rule and the fault type, where the text type includes a battery system fault prompt text, an electric drive system fault prompt text, and an electric control system fault prompt text.
Through the arrangement, after various actual faults are classified and graded, the vehicle control unit can determine the type of the prompt words to be displayed according to the first prompt rule, and the battery system fault icon, the electric drive system fault icon and the electric control system fault icon are respectively connected with the battery system fault prompt words, the electric drive system fault prompt words and the electric control system fault prompt words, so that the phenomenon of squeezing displayed by the instrument can be greatly relieved.
It should be noted that, in the embodiment of the present invention, the display icons to be displayed correspond to the prompt texts to be displayed one to one. That is, the situation that the battery system fault icon is lighted, but the prompt text of the electric drive system fault is displayed does not occur; similarly, the electric drive system fault icon is not lit, and a text message is displayed to indicate a battery system fault.
It should be noted that, in the embodiment of the present invention, the electric drive system fault icon and the electric drive system fault prompt text are displayed only when the battery system has no a-level, B-level or C-level fault; similarly, the battery system fault icon and the battery system fault prompt text can be displayed only when the electric drive system has no A-level, B-level or C-level faults.
It should be noted that, in the embodiment of the present invention, when a fault occurs in any one of the a-stage, the B-stage, or the C-stage simultaneously in both the electric drive system and the battery system, neither the fault icon nor the prompt text of either one of the two is displayed. This situation is defined as the occurrence of an electric control system fault, and the vehicle control unit may redetermine the fault level of the electric control system with reference to table 1. Therefore, the extrusion of the fault prompt space on the instrument panel can be reduced, and the troubleshooting efficiency of the fault is improved.
Preferably, the first prompting rule is as shown in table 2.
TABLE 2
Figure BDA0003667243460000071
By combining the table 1 and the table 2, the vehicle control unit can determine the type of the display icon and the type of the prompt text which need to be displayed.
As shown in fig. 2, in the embodiment of the present invention, after the step of determining the type of text and before the step of displaying, the fault handling method further includes a step of determining a text level of the vehicle controller according to the second prompt rule, the type of prompt text, and the fault level.
Through the arrangement, the vehicle control unit can control the instrument panel to display the occurring prompt character levels corresponding to the fault levels according to the prompt character types and the fault levels, so that the occupied space of the instrument panel is reduced, the squeezing phenomenon of instrument display is greatly relieved, and the vehicle control unit is also helpful for drivers and maintenance personnel to clearly master the current fault severity, so that the drivers can perform subsequent operation according to the prompt character levels.
Preferably, the second prompting rule is as shown in table 3.
TABLE 3
Figure BDA0003667243460000072
The three failure levels in table 3 are not at the same risk, nor are the selected modes of repair. Specifically, in the embodiment of the invention, the class-A fault does not affect the driving of the vehicle in a short time, but has potential risks, does not need to be maintained immediately, and can suspend maintenance. When the B-level fault occurs, the vehicle can limit the driving power actively or passively, and the maintenance is required in time. When the C-level fault occurs, the vehicle cannot continue to run, or cannot be electrified again after being powered off, and needs to be safely stopped immediately, and contacts a 4S store to wait for rescue.
After the step of determining the text level, the fault handling method further comprises the step of sounding an alarm sound, wherein different fault levels correspond to different alarm sounds, so that a driver can be prompted.
Specifically, in the embodiment of the present invention, before determining the text type, after the step of ranking, the fault handling method further includes a step of sending the most serious fault rank to the meter controller. Therefore, the method is helpful for the driver to master the severity of all faults and judge the subsequent operation required to be carried out through the most serious fault, so that the judgment process of the driver is greatly simplified.
Preferably, in an embodiment of the present invention, when one of an electric drive system fault, a battery system fault, and an electric control system fault occurs, it is necessary to transmit the most serious fault level among the fault levels of the occurred fault types to the meter controller when displaying an icon of the occurred fault type. For example, when a class a fault and a class B fault of a battery system fault occur simultaneously, a prompt text corresponding to the class B fault is sent to the meter controller.
In addition, it should be noted that, the present application does not limit the sequential relationship between the step of sending the most serious fault level to the instrument controller and the step of determining the type of the displayed icon, that is, the two steps may be performed simultaneously or sequentially.
Preferably, in the embodiment of the invention, when the electric control system fault and the electric drive system fault occur simultaneously, the fault icons of the electric control system fault and the electric drive system fault need to be displayed simultaneously, and the prompt words of the corresponding levels are sequentially sent according to the fault severity C level > B level > A level. For example, when a C-level fault of the electric control system fault and a B-level fault of the electric drive system fault occur simultaneously, a prompt text corresponding to the C-level fault of the electric control system fault is sent to the meter controller.
Preferably, in the embodiment of the present invention, when the failure of the electronic control system occurs simultaneously with the failure of the battery system, the failure icons of the electronic control system and the battery system need to be displayed simultaneously, and the prompt words of the corresponding levels are sequentially sent according to the failure severity level C > B > a. For example, when a class a fault of the electric control system fault and a class B fault of the electric drive system fault occur simultaneously, a prompt text corresponding to the class B fault of the electric drive system fault is sent to the meter controller.
As shown in fig. 2, in the embodiment of the present invention, after the fault diagnosis step and before the type division step, the fault processing method further includes a step of forming a plurality of fault codes corresponding to a plurality of actual faults, and reporting the fault codes stored in the fault codes. Therefore, maintenance personnel can position the fault accurately, and maintenance efficiency is improved.
The embodiment of the invention provides a fault processing system of an electric vehicle. The fault processing system is controlled by adopting the fault processing method of the electric vehicle power system, and comprises an acquisition module, a vehicle controller and an instrument controller. The acquisition module is used for acquiring the vehicle state; the vehicle control unit is used for carrying out fault type division to a plurality of actual faults to carry out fault grade division according to the fault severity, the fault type includes electric drive system trouble, battery system trouble and electric control system trouble, and the fault grade includes A level trouble, B level trouble and C level trouble, wherein, the fault severity is: class C fault > class B fault > class A fault; the instrument controller receives a display instruction sent by the vehicle control unit and is used for controlling the instrument panel to display the fault type and the fault grade.
In the technical scheme, compared with the prior art that the system faults are divided into six levels or more, the invention divides a plurality of actual faults into electric drive system faults, battery system faults and electric control system faults, and simply divides the grades of the system faults into three levels according to the severity of the faults, thereby being beneficial to drivers and maintenance personnel to clearly master the current severity of the faults and greatly relieving the pressure of too much display contents of instruments.
Specifically, in the embodiment of the present invention, the obtaining module includes a battery controller that is responsible for monitoring and reporting the working state of the battery, for example, monitoring whether the battery has a fault and a corresponding fault level.
Specifically, in the embodiment of the present invention, the obtaining module further includes a motor controller that is responsible for monitoring and reporting the working state of the motor, for example, monitoring whether the motor has a fault and a corresponding fault level.
The vehicle control unit is responsible for reading and analyzing the signals input by the acquisition module, diagnosing and identifying the fault state of the vehicle and forming a fault code.
Specifically, in the embodiment of the present invention, the obtaining module further includes a plurality of sensors responsible for collecting and reporting more important performance parameters of the vehicle body, for example, sensors capable of collecting performance parameters such as ac and dc charging port temperatures, main chip supply voltage, two-way brake pedal opening degrees, two-way accelerator pedal opening degrees, and the like.
Specifically, in the embodiment of the present invention, the fault handling system of the electric vehicle further includes a storage unit, and the storage unit is configured to store a plurality of fault codes formed by a plurality of actual faults. Therefore, in the subsequent maintenance process, maintenance personnel can conveniently and accurately position the fault, and the maintenance efficiency is improved.
Preferably, in the embodiment of the present invention, the storage unit may be integrated into the vehicle control unit.
It should be noted that, by using the obtaining module to detect a plurality of different parameters of the vehicle, more vehicle state information can be obtained as much as possible, so that on the premise of no leakage of diagnosis, the display efficiency of system faults on the instrument panel can be improved, the squeezing of the fault display space of the instrument panel can be reduced, and the display space of the instrument can be saved. The driver or maintenance personnel can know the system fault in the shortest time, the driving safety is improved, and the driving experience is improved. The method is suitable for pure electric two-wheel drive vehicle types and also suitable for pure electric four-wheel drive vehicle types.
The specific fault definition is negotiated with a VCU (vehicle control unit) developer at the beginning of the project. As a part of a system, the BMS or the MCU generally can not directly and independently send alarm prompt signals to the instrument, and needs to be combined with the faults of other controllers, and after the VCU is comprehensively balanced, a display instruction is uniformly sent to the instrument controller.
It should be noted that, in addition to the battery system and the electric drive system, most of the other subsystems of the vehicle may upload fault conditions to the VCU in a similar manner, such as the wireless charging system and the torque control system. The VCU can also detect whether a fault occurs in a certain subsystem through a corresponding sensor, such as whether the main chip power supply voltage is abnormal, whether the low-voltage management relay functions are abnormal, and the like.
In an optional embodiment, the invention further provides an electric vehicle, which can execute the above fault handling method for the power system of the electric vehicle, and therefore, the electric vehicle also has an effect of improving the efficiency of prompting the system fault on the instrument panel.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: compared with the prior art that system faults are divided into six levels or more, the method divides a plurality of actual faults into electric drive system faults, battery system faults and electric control system faults, and simply divides the levels of the system faults into three levels according to the severity of the faults, so that a driver and maintenance personnel can clearly master the current severity of the faults, and the pressure of too much display contents of instruments can be greatly relieved, and the prompting efficiency of the system faults on an instrument panel is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A fault handling method for a power system of an electric vehicle is characterized by comprising the following steps:
an acquisition step of acquiring a vehicle state of the electric vehicle;
a fault diagnosis step of diagnosing a plurality of actual faults generated by the electric vehicle according to the vehicle state by the vehicle controller;
the vehicle control unit carries out a fault type division step on a plurality of actual faults, wherein the fault types comprise electric drive system faults, battery system faults and electric control system faults;
the vehicle control unit divides a plurality of actual faults in each fault type into a class A fault, a class B fault and a class C fault according to fault severity, wherein the fault severity is as follows: class C fault > class B fault > class A fault;
and the instrument controller receives a display instruction sent by the vehicle control unit so as to display the fault type and the fault grade.
2. The method of fault handling for an electric vehicle powertrain of claim 1, wherein after the grading step and before the displaying step, the method further comprises a first determining step of determining whether the electric drive system fault and the battery system fault are present simultaneously, and if so, performing a consolidated fault step of grading a plurality of the actual faults to different fault grades of the electric control system fault, and if not, performing a displaying step.
3. The method of claim 2, wherein the merging faults step is:
when the electric drive system fault and the battery system fault are both A-level faults, dividing the actual faults into A-level faults of the electric control system faults; or,
when one of the electric drive system fault and the battery system fault is a class A fault, the other of the electric drive system fault and the battery system fault is a class B fault, or the electric drive system fault and the battery system fault are both class B faults, dividing the plurality of actual faults into class B faults of the electric control system fault; or,
when one of the electric drive system fault and the battery system fault is a class C fault, then the plurality of actual faults are classified as class C faults of the electric control system fault.
4. The method of fault handling for an electric vehicle powertrain of claim 1, wherein after the ranking step and before the displaying step, the method further comprises the vehicle control unit determining a display icon type based on the first prompting rule and the fault type, the icon type comprising a battery system fault icon, an electric drive system fault icon, and an electric control system fault icon.
5. The method of claim 1, wherein after the grading step and before the displaying step, the method further comprises a step of determining a text type of the vehicle controller according to a first prompting rule and the fault type, wherein the text type includes a battery system fault prompting text, an electric drive system fault prompting text and an electric control system fault prompting text.
6. The method of claim 5, wherein after the step of determining the type of text, and before the step of displaying, the method further comprises a step of determining a text level, in which the vehicle controller determines a text level of the prompt according to a second prompt rule, the type of the prompt and the fault level.
7. The method of claim 5, further comprising the step of sending the most severe fault level to a meter controller after the step of ranking before the step of determining text type.
8. The method of claim 1, wherein after the step of diagnosing the fault and before the step of classifying the type, the method further comprises a step of forming a plurality of fault codes corresponding to a plurality of the actual faults and reporting the fault codes stored in the fault codes.
9. A fault handling system of an electric vehicle, characterized in that it is controlled by the fault handling method of an electric vehicle power system according to any one of claims 1 to 8, the fault handling system comprising:
an acquisition module for acquiring the vehicle state;
the vehicle control unit is used for carrying out fault type division on a plurality of actual faults and carrying out fault grade division according to fault severity, wherein the fault types comprise electric drive system faults, battery system faults and electric control system faults, the fault grades comprise A-grade faults, B-grade faults and C-grade faults, and the fault severity is as follows: class C fault > class B fault > class A fault;
and the instrument controller is used for receiving the display instruction sent by the vehicle control unit and controlling the instrument panel to display the fault type and the fault grade.
10. The fault handling system for electric vehicles according to claim 9, further comprising a storage unit for storing a plurality of fault codes for a plurality of actual faults.
CN202210590774.9A 2022-05-27 2022-05-27 Fault processing method and fault processing system for electric vehicle power system Active CN114932807B (en)

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