CN116635284A - Dual-motor hybrid vehicle and battery fault processing method and system thereof - Google Patents

Dual-motor hybrid vehicle and battery fault processing method and system thereof Download PDF

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Publication number
CN116635284A
CN116635284A CN202180084037.5A CN202180084037A CN116635284A CN 116635284 A CN116635284 A CN 116635284A CN 202180084037 A CN202180084037 A CN 202180084037A CN 116635284 A CN116635284 A CN 116635284A
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China
Prior art keywords
fault
motor
battery
voltage
level
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CN202180084037.5A
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Chinese (zh)
Inventor
惠冰
刘义强
方小军
赵西伟
王瑞平
肖逸阁
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Zhejiang Geely Holding Group Co Ltd
Ningbo Geely Royal Engine Components Co Ltd
Zhejiang Geely Power Train Co Ltd
Original Assignee
Zhejiang Geely Holding Group Co Ltd
Ningbo Geely Royal Engine Components Co Ltd
Zhejiang Geely Power Train Co Ltd
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Publication of CN116635284A publication Critical patent/CN116635284A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/50—Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
    • 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
    • B60R16/03—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 supply of electrical power to vehicle subsystems or for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/02—Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
    • B60W50/029—Adapting to failures or work around with other constraints, e.g. circumvention by avoiding use of failed parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/90—Vehicles comprising electric prime movers
    • B60Y2200/92—Hybrid vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/13—Failsafe arrangements
    • 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
    • Y02T10/62—Hybrid vehicles

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Automation & Control Theory (AREA)
  • Human Computer Interaction (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

A dual-motor hybrid vehicle and a battery fault handling method and system thereof. The battery fault processing method comprises the following steps: detecting whether the power battery fails in real time in the running process of the vehicle; if yes, determining a fault level of the power battery, wherein the fault level comprises a medium level capable of keeping the vehicle running under limp; performing fault post-processing according to the fault level, including: when the fault level of the power battery is a medium level, the engine is controlled to drive the first motor to generate electricity and simultaneously the first motor is controlled to enter a voltage maintenance mode to operate so as to provide low voltage for a low-voltage load of the vehicle through a DCDC converter of the vehicle.

Description

Dual-motor hybrid vehicle and battery fault processing method and system thereof Technical Field
The invention relates to the technical field of vehicles, in particular to a battery fault processing method and a battery fault processing system of a double-motor hybrid vehicle and the double-motor hybrid vehicle comprising the battery fault processing system.
Background
The hybrid technology is a key technology for realizing energy conservation and emission reduction of vehicles. The dual motor hybrid system is a high efficiency hybrid system. Vehicles currently employing a two-motor hybrid system may include a front-drive type and a rear-drive type. A precursor hybrid vehicle employing a two-motor series-parallel (i.e., series + parallel) typically has a system configuration as shown in fig. 1, where ICE represents an internal combustion engine, P1, P2 are motors, and the P1 motor is fixedly coupled to the crankshaft of the internal combustion engine. When clutch C0 is disengaged, the engine is disengaged from the driveline of the vehicle and the P1 motor alone is driven to charge a power battery (not shown in FIG. 1) and the P2 motor drives the vehicle in series. After the clutch C0 is closed, the engine can directly drive the vehicle through the clutch C0, the P1 motor and the P2 motor are charged and discharged as required, and the vehicle works in a parallel mode.
For such hybrid vehicles, it is particularly important to use a correct post-processing method after the power battery of the vehicle fails, especially for faults of different severity, if the same processing measures are taken without distinction, personal hazards may be caused to the driver and passengers, or potential safety hazards may be caused to the running of the vehicle. Meanwhile, as two kinds of hybrid electric vehicles are not provided with 12V generators, how to maintain the electricity consumption requirement of the low-voltage end load of the whole vehicle is important after the high-voltage relay has to be disconnected after the serious fault of the power battery. There is no reasonable and effective treatment scheme for the power battery failure of a dual-motor hybrid vehicle in the prior art.
Disclosure of Invention
In view of the above, the present invention proposes a battery fault handling method and a battery fault handling system for a two-motor hybrid vehicle that overcomes or at least partially solves the above-mentioned problems, and a two-motor hybrid vehicle including the battery fault handling system.
The invention aims to provide a battery fault processing method for a double-motor hybrid power vehicle, which can reasonably and effectively carry out different fault post-processing according to the battery fault level and ensure the safety of personnel and vehicles.
A further object of the present invention is to ensure that the functions necessary for safe driving of the vehicle are not affected, while ensuring the safety of personnel and vehicles.
In particular, according to an aspect of an embodiment of the present invention, there is provided a battery fault handling method of a two-motor hybrid vehicle including an engine, a first motor connected to the engine, and a power battery connected to the first motor; the battery fault processing method comprises the following steps:
detecting whether the power battery fails in real time in the running process of the vehicle;
if yes, determining a fault level of the power battery, wherein the fault level comprises a medium level capable of keeping the vehicle running under limp;
and performing fault post-processing according to the fault level, including: when the failure level of the power battery is the medium level, the engine is controlled to drive the first motor to generate electricity and the first motor is controlled to operate in a voltage maintenance mode so as to provide low voltage for a low-voltage load of the vehicle through a DCDC converter of the vehicle.
Optionally, when the failure level of the power battery is the medium level, before controlling the engine to drive the first motor to generate electricity and controlling the first motor to operate in a voltage maintenance mode, the battery failure handling method further includes:
And unloading the high-voltage load of the vehicle.
Optionally, when the failure level of the power battery is the medium level, after controlling the engine to drive the first motor to generate electricity and controlling the first motor to operate in a voltage maintenance mode, the battery failure handling method further includes:
and after the low voltage of the low voltage load is stabilized, disconnecting the high voltage relay of the power battery and sending out a first prompt.
Optionally, the step of controlling the first motor to operate in a voltage maintenance mode includes:
performing PID control on the output torque of the first motor by taking a preset target voltage as an adjustment target so as to adjust the voltage of the first motor;
monitoring a difference between the actual voltage of the first motor and the preset target voltage;
judging whether the difference value is smaller than a preset voltage threshold value or not;
if yes, continuing to execute the PID control on the output torque of the first motor by taking the preset target voltage as an adjustment target so as to adjust the voltage of the first motor;
if not, terminating the voltage maintaining mode.
Optionally, the fault level further includes a severity level that severely endangers the safety of the driver and passengers;
After terminating the voltage maintenance mode, the battery fault handling method further includes:
and upgrading the fault grade of the power battery to the serious grade, and activating the fault post-treatment corresponding to the serious grade.
Optionally, the fault level further includes a severity level that severely endangers the safety of the driver and passengers;
the step of performing fault post-processing according to the fault level further comprises:
when the failure level of the power battery is the serious level, the high-voltage relay of the power battery is disconnected, and the speed of the vehicle is limited below a specified speed.
Optionally, the step of performing fault post-processing according to the fault level further includes:
and when the fault grade of the power battery is the serious grade, an alarm and/or a second prompt are/is sent out.
Optionally, the failure level further comprises a light level;
the step of performing fault post-processing according to the fault level further comprises:
and when the fault level of the power battery is the light level, controlling the engine to keep running, and reducing the charge-discharge power limit value of the high-voltage load of the vehicle to be below a specified power value.
Optionally, the step of performing fault post-processing according to the fault level further includes:
and when the failure grade of the power battery is the light grade, a third prompt is sent out.
Optionally, the step of detecting in real time whether the power battery fails during the running of the vehicle includes:
acquiring state data of the power battery in real time in the running process of the vehicle, and judging whether the power battery fails according to the state data of the power battery;
the step of determining the failure level of the power battery includes:
determining the fault type of the power battery according to the state data of the power battery;
and obtaining the fault grade of the power battery according to the fault type of the power battery and a preset mapping table of the fault type and the fault grade.
According to another aspect of an embodiment of the present invention, there is also provided a battery fault handling system of a two-motor hybrid vehicle including an engine, a first motor connected with the engine, and a power battery connected with the first motor; the control system comprises a whole vehicle controller, and a battery controller and a motor controller which are respectively connected with the whole vehicle controller, wherein the whole vehicle controller comprises a motor, a battery controller and a motor controller, wherein the motor controller is connected with the battery controller, the motor controller and the motor controller, and the control system comprises a motor controller and a control system
The battery controller is configured to detect whether the power battery fails in real time during the running of the vehicle; if yes, determining a fault level of the power battery and sending the fault level to the whole vehicle controller, wherein the fault level comprises a medium level capable of keeping the vehicle running under limp;
the battery controller, the whole vehicle controller and the motor controller are configured to cooperatively perform fault post-processing according to the fault level;
when the fault level of the power battery is the medium level, the whole vehicle controller is configured to control the engine to drive the first motor to generate power and send a motor mode command to the motor controller;
the motor controller is configured to control the first motor to operate in a voltage sustaining mode according to the motor mode command to provide a low voltage to a low voltage load of the vehicle through a DCDC converter of the vehicle.
Optionally, the whole vehicle controller is further configured to:
when the failure level of the power battery is the medium level, the high-voltage load of the vehicle is unloaded before the engine is controlled to drive the first motor to generate electricity.
Optionally, the battery controller is further configured to:
when the fault grade of the power battery is the medium grade, after the first motor operates in a voltage maintaining mode, after the low voltage of the low voltage load is stabilized, the high voltage relay of the power battery is disconnected, and the whole vehicle controller is triggered to send a first prompt.
Optionally, the motor controller is further configured to:
performing PID control on the output torque of the first motor by taking a preset target voltage as an adjustment target so as to adjust the voltage of the first motor;
monitoring a difference between the actual voltage of the first motor and the preset target voltage;
judging whether the difference value is smaller than a preset voltage threshold value or not;
if yes, continuing to carry out PID control on the output torque of the first motor by taking the preset target voltage as an adjusting target, monitoring the difference value between the actual voltage of the first motor and the preset target voltage, and judging whether the difference value is smaller than a preset voltage threshold value or not; if not, terminating the voltage maintaining mode.
Optionally, the fault level further includes a severity level that severely endangers the safety of the driver and passengers;
the motor controller is further configured to send exit information to the vehicle controller after terminating the voltage maintenance mode;
The whole vehicle controller is further configured to upgrade the fault grade of the power battery to the serious grade according to the exit information, and activate fault post-processing corresponding to the serious grade.
Optionally, the fault level further includes a severity level that severely endangers the safety of the driver and passengers;
the battery controller is further configured to:
when the fault grade of the power battery is the serious grade, the high-voltage relay of the power battery is disconnected; and is also provided with
The vehicle controller is further configured to: and when the failure level of the power battery is the serious level, limiting the speed of the vehicle to be below a specified speed.
Optionally, the whole vehicle controller is further configured to:
and when the fault grade of the power battery is the serious grade, an alarm and/or a second prompt are/is sent out.
Optionally, the failure level further comprises a light level;
the vehicle controller is further configured to:
and when the fault level of the power battery is the light level, controlling the engine to keep running, and reducing the charge-discharge power limit value of the high-voltage load of the vehicle to be below a specified power value.
Optionally, the whole vehicle controller is further configured to:
And when the failure grade of the power battery is the light grade, a third prompt is sent out.
According to yet another aspect of an embodiment of the present invention, there is also provided a two-motor hybrid vehicle including an engine, a first motor connected to the engine, a power battery connected to the first motor, and a battery failure handling system of the two-motor hybrid vehicle of any one of the preceding.
In the dual-motor hybrid vehicle and the battery fault processing method and system thereof provided by the embodiment of the invention, after the occurrence of the fault of the power battery is detected, the fault grade of the power battery is determined, and corresponding fault post-processing is carried out according to the fault grade of the power battery, so that different fault post-processing can be reasonably and effectively carried out according to the fault grade of the battery, the grading protection is realized, and the safety of personnel and vehicles is ensured. Particularly, when the power battery has medium-grade faults, the first motor is driven by the engine to generate electricity and is controlled to operate in a voltage maintenance mode so as to provide stable high voltage for the DCDC converter, and the DCDC converter is converted into low voltage to be supplied to a low-voltage load of a vehicle, so that normal operation of a plurality of low-voltage (12V) loads of the whole vehicle is ensured, and on the premise of ensuring safety of personnel and the vehicle, functions necessary for safe driving of the vehicle are not influenced.
Further, when a serious grade fault occurs to the power battery, the high-voltage relay is disconnected and the speed of the vehicle is limited; when the power battery only has a slight grade fault, the engine is kept running, and the limit value of the charge and discharge power of the high-voltage load of the vehicle is reduced, so that the capability of utilizing the whole vehicle hardware is maximized as much as possible on the premise of meeting the safety of personnel, the driving requirement of a driver is met, and the safety and the robustness of the vehicle are improved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
FIG. 1 is a schematic diagram of a system architecture of a two-motor hybrid vehicle;
FIG. 2 is a schematic diagram of a dual motor hybrid vehicle with a power battery with a high voltage relay open to power a low voltage load;
FIG. 3 is a flow chart of a battery fault handling method for a two-motor hybrid vehicle according to one embodiment of the invention;
FIG. 4 is a flowchart illustrating steps for controlling a first motor to operate in a voltage maintenance mode according to one embodiment of the present invention;
fig. 5 is a flowchart illustrating a battery fault handling method of a two-motor hybrid vehicle according to another embodiment of the present invention;
fig. 6 is a flowchart illustrating a battery fault handling method of a two-motor hybrid vehicle according to still another embodiment of the present invention;
fig. 7 is a schematic configuration diagram of a battery fault handling system of a two-motor hybrid vehicle according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Current two-motor hybrid vehicles, particularly two-motor series-parallel (i.e., series + parallel) lead hybrid vehicles, generally have a system configuration as shown in fig. 1, and implement a series mode or a parallel mode by opening or closing a clutch C0. When the vehicle works in the series mode, the engine speed is decoupled from the load, the vehicle speed, the gear and the like, so that the engine can work in a section with better oil consumption and emission; when the vehicle works in the parallel mode, the engine directly drives the vehicle, so that efficiency losses caused by charging of the P1 motor, discharging of the P2 motor and charging and discharging of the battery are reduced. The hybrid vehicle needs to perform appropriate mode selection according to the current state of the vehicle, so as to achieve better fuel consumption, emission, drivability, NVH (Noise, vibration, harshness) and other comprehensive performances.
The inventors have found that for such hybrid vehicles, it is particularly important to employ a correct post-processing method when the high-voltage power battery of the vehicle fails. For example, when a power battery controller detects a serious insulation fault, in order to prevent the high-voltage system from causing personal harm to personnel (including drivers and passengers) in the vehicle, it is necessary to disconnect the high-voltage relay of the power battery as soon as possible, and at the same time, the vehicle enters a "limp-home" mode, actively limits speed and prompts the driver to safely stop the vehicle through an instrument panel; when the fault level detected by the power battery controller is not high, for example, the temperature of the battery core of the power battery exceeds a certain threshold, but when the temperature does not reach the threshold for alarming or disconnecting the high-voltage relay, the charge and discharge power of the battery is required to be limited to prevent fault upgrading, and at the moment, if the fault post-treatment of the overload is adopted (for example, the high-voltage relay is forcibly disconnected, the ultra-low speed limit is realized, etc.), unnecessary confusion is brought to a driver, and the potential safety hazard is brought to the serious driver because the vehicle cannot normally run.
Meanwhile, such hybrid vehicles generally have no 12V generator configured by a conventional vehicle, and the power supply of the 12V voltage end is mainly generated by a high-voltage power battery, a DCDC converter and a low-voltage (12V) storage battery together, while maintaining the power consumption requirement of the low-voltage end load of the whole vehicle is important after the high-voltage relay has to be disconnected after the high-voltage power battery has serious faults. This is because all vehicle safety functions, such as steering assist, braking assist of the vehicle, etc., require a stable 12V low-voltage supply voltage. This requires that after the high voltage power battery has disconnected the high voltage relay due to a fault, the P1 motor is controlled to act as a generator to power the DCDC converter-12V battery, as shown in fig. 2.
Based on the above findings, the present invention proposes a battery failure handling method of a two-motor hybrid vehicle in order to solve or at least partially solve the above problems. The dual-motor hybrid vehicle according to the battery fault handling method of the present invention may include an engine, a first motor connected to the engine, and a power battery connected to the first motor, and the specific connection and arrangement may be referred to in fig. 1. It should be noted that the power battery is not shown in fig. 1, and those skilled in the art will recognize the arrangement of the power battery. The two-motor hybrid vehicle may further include a second motor and a driveline. The second motor is connected with a power battery, and the power battery supplies power for the second motor so that the second motor drives wheels through a power transmission system.
Fig. 3 illustrates a battery fault handling method of a two-motor hybrid vehicle according to an embodiment of the present invention. Referring to fig. 3, the battery fault handling method may include at least the following steps S100 to S300.
Step S100, detecting whether the power battery fails in real time during the running process of the vehicle. If yes, go to step S200.
Step S200, determining a failure level of the power battery, wherein the failure level includes a medium level at which the vehicle can be kept running in limp home.
Step S300, performing fault post-processing according to the fault level, including: when the failure level of the power battery is a medium level, the engine is controlled to drive the first motor to generate electricity and the first motor is controlled to operate in a voltage maintenance mode so as to provide low voltage for a low voltage load of the vehicle through a DCDC converter of the vehicle.
In the battery fault processing method of the dual-motor hybrid vehicle, after the power battery is detected to be faulty, the fault grade of the power battery is determined, and corresponding fault post-processing is performed according to the fault grade of the power battery, so that different fault post-processing can be reasonably and effectively performed according to the fault grade of the battery, hierarchical protection is realized, and personnel and vehicle safety is ensured. Particularly, when the power battery has medium-grade faults, the first motor is driven by the engine to generate electricity and is controlled to operate in a voltage maintenance mode so as to provide stable high voltage for the DCDC converter, and the DCDC converter is converted into low voltage to be supplied to a low-voltage load of a vehicle, so that normal operation of a plurality of low-voltage (12V) loads of the whole vehicle is ensured, and on the premise of ensuring safety of personnel and the vehicle, functions necessary for safe driving of the vehicle are not influenced.
In the above step S100, the state data of the power battery may be obtained in real time during the running of the vehicle, and whether the power battery fails may be determined according to the state data of the power battery. Specifically, the state data of the power battery may be obtained from a battery sensor and/or obtained from other sensors of the whole vehicle through a CAN network of the vehicle, including but not limited to a battery cell temperature, an insulation resistance, a battery cell voltage, and the like. Those skilled in the art should understand how to determine the battery fault according to the state data of the power battery, and the description is omitted herein.
In the above step S200, the failure level of the power battery may be determined by: firstly, determining the fault type of the power battery according to the state data of the power battery, and then obtaining the fault level of the power battery according to the fault type of the power battery and a preset mapping table of the fault type and the fault level.
In the invention, the known prior scheme can be adopted to dynamically identify the fault type of the power battery according to the state data of the power battery, which is not the focus of the invention, and therefore, the description is not repeated.
The mapping table of the fault types and the fault grades is designed in advance, and the fault types are graded according to the result severity possibly caused by different fault types in the mapping table. For example, insulation detection failure faults (which may occur after a vehicle crash), high voltage interlock detection failure faults, cell voltage imbalance, severe cell over-temperature faults (cell temperature above a first threshold), etc. can seriously threaten driver and passenger safety and are therefore classified as severe faults, mapped to severity levels. A cell typically over-temperature fault (cell temperature above the second threshold but below the first threshold) or the like affects driver and passenger safety, but the vehicle may also be driven in limp-home mode in such a fault, and is therefore classified as a medium fault, mapped to a medium grade. The remaining minor battery faults were classified as minor faults and mapped to minor grades. The classification of the type of failure of the power battery may be performed according to practical applications, to which the present invention is not particularly limited. The fault level of the power battery can be determined by searching a mapping table of the preset fault type and the fault level.
In addition, the step of identifying the type of failure of the power battery may also be performed in step S100. In this case, in step S100, the fault type of the power battery is first identified according to the state data of the power battery, if the fault type of the power battery is identified, it indicates that the power battery is faulty, and at this time, the step of obtaining the fault level of the power battery according to the fault type of the power battery and the preset mapping table of the fault type and the fault level is performed.
In the above step S300, different post-fault processing manners are adopted according to different fault levels. Specifically, the corresponding post-fault treatment measures can be determined by querying a preset fault level-post-fault treatment relation table, so that the optimal post-fault treatment measures are adopted.
In particular, as shown in fig. 4, when the failure level of the power battery is a medium level, controlling the first motor to operate in the voltage maintenance mode to supply the low voltage power to the low voltage load of the vehicle may be achieved by the following steps.
In step S301, with the preset target voltage as the adjustment target, PID (Proportional-Integral-Differential) control is performed on the output torque of the first motor to adjust the voltage of the first motor. The preset target voltage may be calibrated by experiment.
In step S302, a difference between the actual voltage of the first motor and a preset target voltage is monitored.
Step S303, judging whether the difference is smaller than a preset voltage threshold. If yes, return to step S301, if no, go to step S304.
Step S304, the voltage maintaining mode is terminated. That is, the first motor is controlled to exit the voltage maintaining mode at this time.
The strategy of PID control in the voltage maintenance mode adopted in this embodiment is to add a voltage outer loop based on the bus voltage PID regulation of the high voltage side of the first motor and DCDC converter on the torque outer loop on the basis of the framework of the usual motor control current inner loop and torque outer loop. The voltage outer ring dynamically controls the bus voltage value by adjusting the real-time torque of the first motor so as to ensure that a stable high-voltage source is provided for the DCDC converter and ensure the stable operation of the DCDC converter. When the first motor cannot maintain the stable bus voltage (at this time, the actual voltage and the preset target voltage of the first motor are greater than the preset voltage threshold), the first motor exits the voltage maintaining mode. Through the mode, the power consumption of the DCDC converter can be maintained through the first motor, and stable low-voltage supply is finally ensured for the whole vehicle, so that the vehicle can be ensured to have no influence on the running function of the vehicle as much as possible in a limp mode, and the driving requirement of a driver is met. For example, when a battery failure occurs and the vehicle is in a highway, the failure method of the present invention can ensure that the vehicle travels to a safe parking place. Of course, those skilled in the art will appreciate that when the failure level of the power battery is medium, the vehicle will enter a limp-home mode, which is described in numerous scenarios and not otherwise described herein.
Further, before controlling the first motor to operate in the voltage maintenance mode, the torque of the first motor may be controlled to ensure that the value of the current flowing on the dc bus on the high voltage side of the first motor and the DCDC converter is less than a specified current threshold.
Further, after the voltage maintenance mode is terminated, the fault level of the power battery can be upgraded to a serious level, and the fault post-treatment corresponding to the serious level is activated, so that the safety of vehicles and personnel is ensured as much as possible.
Fig. 5 is a flowchart illustrating a battery fault handling method of a two-motor hybrid vehicle according to another embodiment of the present invention. Referring to fig. 5, the battery fault handling method may include at least the following steps S510 to S550.
Step S510, detecting whether the power battery fails in real time during the running process of the vehicle. If yes, go to step S520.
In step S520, a failure level of the power battery is determined, wherein the failure level includes a serious level that seriously endangers safety of the driver and the passenger, a medium level that can keep the vehicle running in a limp home, and a light level. When the failure level of the power battery is a medium level, step S530 is performed. When the failure level of the power battery is a serious level, step S540 is performed. When the failure level of the power battery is a light level, step S550 is performed.
In step S530, the engine is controlled to drive the first motor to generate power and the first motor is controlled to operate in a voltage maintenance mode to provide a low voltage for a low voltage load of the vehicle through a DCDC converter of the vehicle.
Step S540 turns off the high-voltage relay of the power battery and limits the vehicle speed to below a specified vehicle speed.
In step S550, the control engine keeps running, and the charge/discharge power limit of the high-voltage load of the vehicle is reduced to a value equal to or lower than the specified power value.
In this embodiment, the steps S510, S520 and S530 are performed in the same manner as described above, and the description will not be repeated. When serious grade fault occurs in the power battery, the high-voltage relay is directly disconnected, and at the moment, high-voltage current possibly flows through the high-voltage relay, so that the risk of damaging the high-voltage relay is caused; meanwhile, the speed of the vehicle can be limited below a designated speed through chassis braking, engine torque limiting and other modes, and the designated speed can be set according to practical application requirements, for example, can be set to be 10km/h. When the power battery only has light grade faults, the engine is kept running, and the limit value of the charge and discharge power of the high-voltage load of the vehicle is reduced, so that the high-voltage power Chi Fuzai is reduced as much as possible while driving is ensured, and the fault grade is prevented from being upgraded. The high voltage load may include, for example, an air conditioning compressor, PTC (Positive Temperature Coefficient, positive temperature system) heating element, a drive motor (i.e., a second motor), and the like. The specified power value may be set according to practical application requirements, for example, to 10kW.
According to the method, the device and the system, the classification protection strategy is adopted, so that the capability of utilizing the whole vehicle hardware can be maximized as much as possible on the premise that the personnel safety is met, the driving requirement of a driver is met, and the safety and the robustness of the vehicle are improved.
In a further embodiment, as shown in fig. 6, before step S530, that is, before controlling the engine to drive the first motor to generate electricity and controlling the first motor to operate in the voltage maintenance mode, step S529 may further include: the high-voltage load of the vehicle is unloaded. The high-voltage load related to the power battery is firstly unloaded to ensure that the current of the output end of the power battery is zero as much as possible, so that the power battery pack and the high-voltage system can be effectively protected.
In a further embodiment, with continued reference to fig. 6, after step S530, that is, after controlling the engine to drive the first motor to generate electricity and controlling the first motor to operate in the voltage maintenance mode, step S531 may further include: after the low voltage of the low voltage load is stabilized, the high voltage relay of the power battery is disconnected, and a first prompt is sent out. In this embodiment, after the first motor enters the voltage maintenance mode for a period of time to stabilize the low voltage supplied to the low voltage load, the high voltage relay is turned off to protect related hardware such as the power battery pack, the high voltage system, and the like. Since the high voltage side supply of the DCDC converter has been previously achieved by adjusting the mode of the first motor, the remaining high voltage load has been unloaded, so that the current flowing through the high voltage relay at the moment of switching off the high voltage relay will actually be very small, thereby playing a good role in protecting the high voltage relay. In addition, after the high-voltage relay is disconnected, the DCDC converter and the first motor can still continuously work, and power supply of a low-voltage load of the whole vehicle is maintained. The first prompt may be sent by an instrument of the vehicle, may be a text prompt, a light prompt, a sound prompt, or the like, or may be sent by other terminals (such as a mobile terminal of a driver, etc.), which is not particularly limited in the present invention.
In a further embodiment, with continued reference to fig. 6, when the failure level of the power battery is a serious level, step S541 may further include: an alarm and/or a second prompt is issued. The alarm and/or the second prompt may be sent by the vehicle instrument, may be a text prompt, a light prompt, a sound prompt, etc., or may be sent by other terminals (such as a mobile terminal of the driver, etc.), which is not limited in the present invention. The driver is alerted to the safe stop by issuing an alarm and/or prompt. In fig. 6, although step S541 is disposed after step S540, step S541 may be performed before step S540 or simultaneously with step S540, which does not affect the technical solution of the present invention. In this embodiment, steps S540 and S541 may constitute a fault post-processing measure corresponding to the severity level as a whole.
In a further embodiment, with continued reference to fig. 6, when the failure level of the power battery is a light level, step S551 may further include: a third prompt is issued. The third prompt can be sent out by a vehicle instrument, can be a text prompt, a light prompt, a sound prompt and the like, and can be sent out by other terminals (such as a mobile terminal of a driver and the like), so the invention is not limited to the above. It should be noted that, although step S551 is disposed after step S550 in fig. 6, step S551 may be performed before step S550 or simultaneously with step S550, which does not affect the technical solution of the present invention. In this embodiment, steps S550 and S551 may constitute the post-fault handling means corresponding to the light level as a whole.
It should be noted that, the foregoing method for processing the battery fault of the two-motor hybrid vehicle may be executed by a dedicated controller, or may be executed in cooperation with a vehicle controller, a battery controller, and a motor controller that are already configured in the hybrid vehicle.
Based on the same technical conception, the invention also provides a battery fault processing system of the double-motor hybrid power vehicle. The battery fault handling system is equally applicable to the aforementioned two-motor hybrid vehicle.
Fig. 7 shows a schematic configuration of a battery fault handling system of a two-motor hybrid vehicle according to an embodiment of the present invention. Referring to fig. 7, the battery fault handling system may include at least a vehicle controller 1, and a motor controller 2 and a battery controller 3 respectively connected to the vehicle controller 1.
The functions of the components or devices of the battery fault handling system of the two-motor hybrid vehicle and the connection relationship between the components according to the embodiment of the present invention will now be described.
The battery controller 3 is configured to detect in real time whether or not the power battery has failed during the running of the vehicle; if so, determining a fault level of the power battery and transmitting the fault level to the whole vehicle controller 1, wherein the fault level comprises a medium level capable of keeping the vehicle running under limp.
The battery controller 3, the whole vehicle controller 1, and the motor controller 2 are configured to cooperatively perform a post-fault process according to the fault level.
When the failure level of the power battery is a medium level, the vehicle controller 1 is configured to control the engine to drive the first motor to generate power and send a motor mode command to the motor controller 2. The motor controller 2 is configured to control the first motor to operate in a voltage sustaining mode according to a motor mode command to provide a low voltage to a low voltage load of the vehicle through a DCDC converter of the vehicle.
The battery fault processing system of the double-motor hybrid power vehicle can reasonably and effectively conduct different fault post-processing according to the battery fault grade, realize grading protection and ensure personnel and vehicle safety. Particularly, when the power battery has medium-level faults, stable high voltage can be provided for the DCDC converter, and normal operation of a plurality of low-voltage (12V) loads of the whole vehicle is ensured, so that functions necessary for safe driving of the vehicle are not influenced on the premise of ensuring safety of personnel and the vehicle.
In one embodiment of the present invention, the vehicle controller 1 may be further configured to:
when the failure level of the power battery is a medium level, the high-voltage load of the vehicle is unloaded before the engine is controlled to drive the first motor to generate electricity.
In one embodiment of the present invention, the battery controller 3 may be further configured to:
when the fault level of the power battery is a medium level, after the first motor operates in a voltage maintenance mode, after the low voltage of the low voltage load is stabilized, the high voltage relay of the power battery is disconnected, and the whole vehicle controller 1 is triggered to send out a first prompt.
In one embodiment of the invention, the motor controller 2 may be further configured to:
taking a preset target voltage as an adjustment target, performing PID control on the output torque of the first motor to adjust the voltage of the first motor;
monitoring a difference value between the actual voltage of the first motor and a preset target voltage;
judging whether the difference value is smaller than a preset voltage threshold value or not;
if yes, continuing to carry out PID control on the output torque of the first motor by taking the preset target voltage as an adjusting target, monitoring the difference value between the actual voltage of the first motor and the preset target voltage, and judging whether the difference value is smaller than a preset voltage threshold value or not; if not, the voltage maintenance mode is terminated.
In one embodiment of the invention, the failure level may also include a severity level that severely endangers the driver and passengers. In this case, the motor controller 2 may also be configured to send the exit information to the vehicle controller 1 after terminating the voltage maintenance mode. The vehicle controller 1 may be further configured to upgrade the failure level of the power battery to a severity level according to the exit information, and activate a post-failure process corresponding to the severity level.
In one embodiment of the present invention, the battery controller 3 may be further configured to:
when the failure level of the power battery is a serious level, the high-voltage relay of the power battery is disconnected.
The vehicle controller 1 may be further configured to: when the failure level of the power battery is a serious level, the vehicle speed of the vehicle is limited to a specified vehicle speed or less.
In a further embodiment, the whole vehicle controller 1 may be further configured to:
when the failure level of the power battery is a serious level, an alarm and/or a second prompt is sent out.
In one embodiment of the invention, the failure level may also include a light level. In this case, the vehicle controller 1 may be further configured to:
when the failure level of the power battery is a light level, the engine is controlled to keep running, and the charge-discharge power limit value of the high-voltage load of the vehicle is reduced below a specified power value.
In a further embodiment, the whole vehicle controller 1 may be further configured to:
and when the failure level of the power battery is a light level, a third prompt is sent out.
In one embodiment of the present invention, the battery controller 3 may be further configured to:
and acquiring state data of the power battery in real time in the running process of the vehicle, and judging whether the power battery fails according to the state data of the power battery.
Further, the battery controller 3 may be further configured to:
determining the fault type of the power battery according to the state data of the power battery;
and obtaining the fault grade of the power battery according to the fault type of the power battery and a preset mapping table of the fault type and the fault grade.
Based on the same technical conception, the invention also provides a double-motor hybrid power vehicle. The two-motor hybrid vehicle includes an engine, a first motor coupled to the engine, a power battery coupled to the first motor, and a battery fault handling system of the two-motor hybrid vehicle of any of the foregoing embodiments or combinations of embodiments. The two-motor hybrid vehicle may further include a second motor and a driveline. The second motor is connected with a power battery, and the power battery supplies power for the second motor so that the second motor drives wheels through a power transmission system.
The dual-motor hybrid vehicle disclosed by the embodiment of the invention can reasonably and effectively carry out different fault post-treatments according to the battery fault level, realize grading protection, maximize the capability of utilizing the whole vehicle hardware as much as possible on the premise of ensuring the safety of personnel and vehicles, and meet the driving requirement of drivers, thereby improving the safety and the robustness of the vehicle.
According to any one of the optional embodiments or the combination of multiple optional embodiments, the following beneficial effects can be achieved according to the embodiment of the invention:
in the dual-motor hybrid vehicle and the battery fault processing method and system thereof provided by the embodiment of the invention, after the occurrence of the fault of the power battery is detected, the fault grade of the power battery is determined, and corresponding fault post-processing is carried out according to the fault grade of the power battery, so that different fault post-processing can be reasonably and effectively carried out according to the fault grade of the battery, the grading protection is realized, and the safety of personnel and vehicles is ensured. Particularly, when the power battery has medium-grade faults, the first motor is driven by the engine to generate electricity and is controlled to operate in a voltage maintenance mode so as to provide stable high voltage for the DCDC converter, and the DCDC converter is converted into low voltage to be supplied to a low-voltage load of a vehicle, so that normal operation of a plurality of low-voltage (12V) loads of the whole vehicle is ensured, and on the premise of ensuring safety of personnel and the vehicle, functions necessary for safe driving of the vehicle are not influenced.
Further, when a serious grade fault occurs to the power battery, the high-voltage relay is disconnected and the speed of the vehicle is limited; when the power battery only has a slight grade fault, the engine is kept running, and the limit value of the charge and discharge power of the high-voltage load of the vehicle is reduced, so that the capability of utilizing the whole vehicle hardware is maximized as much as possible on the premise of meeting the safety of personnel, the driving requirement of a driver is met, and the safety and the robustness of the vehicle are improved.
By now it should be appreciated by those skilled in the art that while exemplary embodiments of the invention have been shown and described in detail herein, many other variations or modifications that are consistent with the principles of the invention may be directly ascertained or derived from the teachings of the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (20)

  1. A battery fault handling method for a two-motor hybrid vehicle, the two-motor hybrid vehicle comprising an engine, a first motor connected to the engine, and a power battery connected to the first motor; the battery fault processing method comprises the following steps:
    detecting whether the power battery fails in real time in the running process of the vehicle;
    if yes, determining a fault level of the power battery, wherein the fault level comprises a medium level capable of keeping the vehicle running under limp;
    and performing fault post-processing according to the fault level, including: when the failure level of the power battery is the medium level, the engine is controlled to drive the first motor to generate electricity and the first motor is controlled to operate in a voltage maintenance mode so as to provide low voltage for a low-voltage load of the vehicle through a DCDC converter of the vehicle.
  2. The battery fault handling method according to claim 1, wherein when the fault level of the power battery is the medium level, the battery fault handling method further includes, before controlling the engine to drive the first motor to generate electricity and controlling the first motor to operate in a voltage sustaining mode:
    and unloading the high-voltage load of the vehicle.
  3. The battery fault handling method according to claim 1, wherein when the fault level of the power battery is the medium level, after controlling the engine to drive the first motor to generate electricity and controlling the first motor to operate in a voltage sustaining mode, the battery fault handling method further comprises:
    and after the low voltage of the low voltage load is stabilized, disconnecting the high voltage relay of the power battery and sending out a first prompt.
  4. The battery fault handling method of claim 1, wherein the step of controlling the first motor to operate in a voltage sustaining mode comprises:
    performing PID control on the output torque of the first motor by taking a preset target voltage as an adjustment target so as to adjust the voltage of the first motor;
    monitoring a difference between the actual voltage of the first motor and the preset target voltage;
    Judging whether the difference value is smaller than a preset voltage threshold value or not;
    if yes, continuing to execute the PID control on the output torque of the first motor by taking the preset target voltage as an adjustment target so as to adjust the voltage of the first motor;
    if not, terminating the voltage maintaining mode.
  5. The battery fault handling method of claim 4, wherein the fault level further comprises a severity level that severely endangers driver and passenger safety;
    after terminating the voltage maintenance mode, the battery fault handling method further includes:
    and upgrading the fault grade of the power battery to the serious grade, and activating the fault post-treatment corresponding to the serious grade.
  6. The battery fault handling method of claim 1, wherein the fault level further comprises a severity level that severely endangers driver and passenger safety;
    the step of performing fault post-processing according to the fault level further comprises:
    when the failure level of the power battery is the serious level, the high-voltage relay of the power battery is disconnected, and the speed of the vehicle is limited below a specified speed.
  7. The battery fault handling method of claim 6, wherein the step of performing fault post-processing according to the fault level further comprises:
    And when the fault grade of the power battery is the serious grade, an alarm and/or a second prompt are/is sent out.
  8. The battery fault handling method of claim 1, wherein the fault grade further comprises a light grade;
    the step of performing fault post-processing according to the fault level further comprises:
    and when the fault level of the power battery is the light level, controlling the engine to keep running, and reducing the charge-discharge power limit value of the high-voltage load of the vehicle to be below a specified power value.
  9. The battery fault handling method of claim 8, wherein the step of performing fault post-processing according to the fault level further comprises:
    and when the failure grade of the power battery is the light grade, a third prompt is sent out.
  10. The battery fault handling method of claim 1, wherein the step of detecting whether the power battery has failed in real time during operation of the vehicle comprises:
    acquiring state data of the power battery in real time in the running process of the vehicle, and judging whether the power battery fails according to the state data of the power battery;
    the step of determining the failure level of the power battery includes:
    Determining the fault type of the power battery according to the state data of the power battery;
    and obtaining the fault grade of the power battery according to the fault type of the power battery and a preset mapping table of the fault type and the fault grade.
  11. A battery fault handling system for a two-motor hybrid vehicle, the two-motor hybrid vehicle including an engine, a first motor connected to the engine, and a power battery connected to the first motor; the control system comprises a whole vehicle controller, and a battery controller and a motor controller which are respectively connected with the whole vehicle controller, wherein the whole vehicle controller comprises a motor, a battery controller and a motor controller, wherein the motor controller is connected with the battery controller, the motor controller and the motor controller, and the control system comprises a motor controller and a control system
    The battery controller is configured to detect whether the power battery fails in real time during the running of the vehicle; if yes, determining a fault level of the power battery and sending the fault level to the whole vehicle controller, wherein the fault level comprises a medium level capable of keeping the vehicle running under limp;
    the battery controller, the whole vehicle controller and the motor controller are configured to cooperatively perform fault post-processing according to the fault level;
    when the fault level of the power battery is the medium level, the whole vehicle controller is configured to control the engine to drive the first motor to generate power and send a motor mode command to the motor controller;
    The motor controller is configured to control the first motor to operate in a voltage sustaining mode according to the motor mode command to provide a low voltage to a low voltage load of the vehicle through a DCDC converter of the vehicle.
  12. The battery fault handling system of claim 11, wherein the vehicle controller is further configured to:
    when the failure level of the power battery is the medium level, the high-voltage load of the vehicle is unloaded before the engine is controlled to drive the first motor to generate electricity.
  13. The battery fault handling system of claim 11, wherein the battery controller is further configured to:
    when the fault grade of the power battery is the medium grade, after the first motor operates in a voltage maintaining mode, after the low voltage of the low voltage load is stabilized, the high voltage relay of the power battery is disconnected, and the whole vehicle controller is triggered to send a first prompt.
  14. The battery fault handling system of claim 11, wherein the motor controller is further configured to:
    performing PID control on the output torque of the first motor by taking a preset target voltage as an adjustment target so as to adjust the voltage of the first motor;
    Monitoring a difference between the actual voltage of the first motor and the preset target voltage;
    judging whether the difference value is smaller than a preset voltage threshold value or not;
    if yes, continuing to carry out PID control on the output torque of the first motor by taking the preset target voltage as an adjusting target, monitoring the difference value between the actual voltage of the first motor and the preset target voltage, and judging whether the difference value is smaller than a preset voltage threshold value or not; if not, terminating the voltage maintaining mode.
  15. The battery fault handling system of claim 14, wherein the fault level further comprises a severity level that severely endangers driver and passenger safety;
    the motor controller is further configured to send exit information to the vehicle controller after terminating the voltage maintenance mode;
    the whole vehicle controller is further configured to upgrade the fault grade of the power battery to the serious grade according to the exit information, and activate fault post-processing corresponding to the serious grade.
  16. The battery fault handling system of claim 11, wherein the fault level further comprises a severity level that severely endangers driver and passenger safety;
    the battery controller is further configured to:
    When the fault grade of the power battery is the serious grade, the high-voltage relay of the power battery is disconnected; and is also provided with
    The vehicle controller is further configured to: and when the failure level of the power battery is the serious level, limiting the speed of the vehicle to be below a specified speed.
  17. The battery fault handling system of claim 16, wherein the vehicle controller is further configured to:
    and when the fault grade of the power battery is the serious grade, an alarm and/or a second prompt are/is sent out.
  18. The battery fault handling system of claim 11, wherein the fault level further comprises a light level;
    the vehicle controller is further configured to:
    and when the fault level of the power battery is the light level, controlling the engine to keep running, and reducing the charge-discharge power limit value of the high-voltage load of the vehicle to be below a specified power value.
  19. The battery fault handling system of claim 18, wherein the vehicle controller is further configured to:
    and when the failure grade of the power battery is the light grade, a third prompt is sent out.
  20. A two-motor hybrid vehicle comprising an engine, a first motor coupled to the engine, a power battery coupled to the first motor, and the battery fault handling system of the two-motor hybrid vehicle of any of claims 11-19.
CN202180084037.5A 2021-04-12 2021-04-12 Dual-motor hybrid vehicle and battery fault processing method and system thereof Pending CN116635284A (en)

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