CN111497869A - Emergency processing method for new energy automobile power battery fault - Google Patents
Emergency processing method for new energy automobile power battery fault Download PDFInfo
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- CN111497869A CN111497869A CN202010353437.9A CN202010353437A CN111497869A CN 111497869 A CN111497869 A CN 111497869A CN 202010353437 A CN202010353437 A CN 202010353437A CN 111497869 A CN111497869 A CN 111497869A
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- 238000003672 processing method Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims abstract description 6
- 238000011217 control strategy Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 239000000178 monomer Substances 0.000 claims description 6
- 206010017577 Gait disturbance Diseases 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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Classifications
-
- 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
- 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
- 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
- B60W50/0205—Diagnosing or detecting failures; Failure detection models
-
- 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
- B60W2050/0292—Fail-safe or redundant systems, e.g. limp-home or backup systems
-
- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Human Computer Interaction (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses an emergency processing method for a power battery fault of a new energy automobile, which is characterized in that when the power battery of the new energy automobile has faults of overlarge temperature difference and pressure difference, BMS communication loss, low SOC (system on chip) and the like, the automobile enters an emergency state, a double-flashing lamp is automatically turned on, the new energy automobile enters a limping mode under the condition of no potential safety hazard, and a tail end discharging mode is adopted for the low SOC condition, so that the automobile can run to a safe area in a low-speed running state, and traffic jam or other safety problems are avoided. According to the method, the new energy automobile in the emergency state enters the limping mode, so that the fault automobile can run to a safe area in time, and the problem of traffic jam caused by automobile faults is effectively avoided; in addition, the double-flashing light has a warning effect and can remind surrounding vehicles to go around in time.
Description
Technical Field
The invention relates to the technical field of power battery fault processing, in particular to an emergency processing method for a new energy automobile power battery fault.
Background
When the temperature difference, the pressure difference, the BMS communication fault, the SOC (system on chip) too low fault and the like occur in the existing new energy automobile, the automobile power is automatically limited, so that the automobile cannot be started, and at the moment, although no safety accident exists, the problems of traffic jam and the like can be caused; therefore, the research on an emergency treatment method for the new energy automobile when the power battery fails is a hot problem in the current new energy automobile research. The invention aims to provide an emergency treatment method for enabling an automobile vehicle controller VCU to enable the automobile to automatically enter a limping mode when a high-voltage battery fails and enabling a power battery to automatically enter a terminal discharge mode under the condition of too low SOC.
Disclosure of Invention
The invention aims to provide an emergency processing method for the faults of a power battery of a new energy automobile, so that the automobile can still run to a safe area when the power battery of the new energy automobile has faults, and the technical scheme adopted by the invention is as follows:
an emergency processing method for faults of a new energy automobile power battery specifically comprises the following steps:
s1, when a fault occurs, a double-flash switch on an automobile instrument desk is immediately turned on;
s2, after the VCU of the vehicle controller receives the double-flash switch signal, the fault reason is detected in 5S;
and S3, according to a fault detection result, the VCU of the vehicle controller sends a control command to limit the power of the driving motor, the battery is not allowed to feed back electric quantity, the vehicle enters a limp mode, when the vehicle slowly runs to the roadside or a safe area, the limp is finished, and the power limitation is removed after the fault is eliminated.
The specific content according to the fault detection result in S3 is:
when the vehicle control unit VCU detects that the fault reason is that the battery temperature is too high, the voltage is too high or the communication between the battery management system BMS and the vehicle control unit VCU is lost, the vehicle control unit VCU sends a control command, the vehicle automatically enters a limp mode, meanwhile, the power of a driving motor is limited, and the battery is not allowed to feed back the electric quantity;
when the VCU of the vehicle control unit detects that the failure reason is that the residual electric quantity SOC of the power battery is too low, the vehicle control unit sends a control command to the battery management system BMS, so that the power battery enters a terminal discharge mode, and meanwhile, the power of the driving motor is limited.
In the S3, the limiting automobile power is divided into five levels, starting from first-level power limiting, and gradually limiting power, wherein the power limiting process does not rebound; the power limitation removing conditions correspond to the five levels and respectively include:
a first level: the power limit condition is not met, namely the power limit can be removed after the fault is eliminated;
second, third and fourth grades: after the fault is eliminated, removing the power limitation when the voltage of the monomer to be charged is greater than the lowest allowable discharge voltage of the power battery;
and five grades: and after the fault is eliminated, the limitation still cannot be removed, the BMS control program of the battery management system is refreshed after the fault is required to be repaired, and the power limitation is removed when the voltage of the to-be-charged monomer is greater than the lowest allowable discharge voltage of the power battery after the fault is activated.
In the process of the power battery terminal discharging mode, the priority of the strategy used by the battery management system BMS is as follows:
the discharge protection strategy takes precedence over the discharge limiting strategy; the cell voltage control strategy takes precedence over the total voltage control strategy.
The invention has the beneficial effects that:
1. the method is suitable for emergency treatment when various power batteries have faults, and the emergency response is rapid;
2. the power of the driving motor is limited in the emergency mode, so that the new energy automobile can run to a safe area at a low speed, traffic jam is avoided, and the life safety of a driver is effectively guaranteed.
Drawings
Fig. 1 is a schematic flow chart of an emergency processing method for a new energy vehicle power battery fault according to the invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example (b): see fig. 1.
An emergency processing method for faults of a new energy automobile power battery specifically comprises the following steps:
s1, when a fault occurs, a double-flash switch on an automobile instrument desk is immediately turned on;
s2, after the VCU of the vehicle controller receives the double-flash switch signal, the fault reason is detected in 5S;
and S3, according to a fault detection result, the VCU of the vehicle controller sends a control command to limit the power of the driving motor, the battery is not allowed to feed back electric quantity, the vehicle enters a limp mode, when the vehicle slowly runs to the roadside or a safe area, the limp is finished, and the power limitation is removed after the fault is eliminated.
The specific content according to the fault detection result in S3 is:
when the vehicle control unit VCU detects that the fault reason is that the battery temperature is too high, the voltage is too high or the communication between the battery management system BMS and the vehicle control unit VCU is lost, the vehicle control unit VCU sends a control command, the vehicle automatically enters a limp mode, meanwhile, the power of a driving motor is limited, and the feedback power of a power battery is not allowed;
when the VCU of the vehicle control unit detects that the failure reason is that the residual electric quantity SOC of the power battery is too low, the vehicle control unit sends a control command to the battery management system BMS, so that the power battery enters a terminal discharge mode, and meanwhile, the power of the driving motor is limited.
In the S3, the limiting automobile power is divided into five levels, starting from first-level power limiting, and gradually limiting power, wherein the power limiting process does not rebound; the power limitation removing conditions correspond to the five levels and respectively include:
a first level: the power limit condition is not met, namely the power limit can be removed after the fault is eliminated;
second, third and fourth grades: after the fault is eliminated, removing the power limitation when the voltage of the monomer to be charged is greater than the lowest allowable discharge voltage of the power battery;
and five grades: and after the fault is eliminated, the limitation still cannot be removed, the BMS control program of the battery management system is refreshed after the fault is required to be repaired, and the power limitation is removed when the voltage of the to-be-charged monomer is greater than the lowest allowable discharge voltage of the power battery after the fault is activated.
In the process of the power battery terminal discharging mode, the priority of the strategy used by the battery management system BMS is as follows:
the discharge protection strategy takes precedence over the discharge limiting strategy; the cell voltage control strategy takes precedence over the total voltage control strategy.
When the power battery of the new energy automobile has faults such as overhigh temperature, overlarge voltage, BMS communication fault of a battery management system, and overlow residual capacity SOC of the power battery, the emergency mode immediately turns on the double-flash lamp, simultaneously limits the power of the driving motor, starts the limp mode under the condition of no potential safety hazard, adopts a terminal discharge mode under the condition of overlow residual capacity SOC of the power battery, so that the new energy automobile can run to a safe region under a low-speed running state without causing potential safety hazards such as traffic jam, and recovers the performance of the power battery according to different power limiting levels after fault removal, wherein the corresponding relation between the control measures of each power limiting level and the recovery conditions is shown in the following table I (the following table takes the new energy automobile provided with the lithium iron phosphate power battery as an example):
watch 1
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention.
Claims (4)
1. An emergency processing method for faults of a new energy automobile power battery is characterized by comprising the following steps:
s1, when a fault occurs, a double-flash switch on an automobile instrument desk is immediately turned on;
s2, after the VCU of the vehicle controller receives the double-flash switch signal, the fault reason is detected in 5S;
and S3, according to a fault detection result, the VCU of the vehicle controller sends a control command to limit the power of the driving motor, the battery is not allowed to feed back electric quantity, the vehicle enters a limp mode, when the vehicle slowly runs to the roadside or a safe area, the limp is finished, and the power limitation is removed after the fault is eliminated.
2. The method for emergency handling of the fault of the power battery of the new energy vehicle according to claim 1, wherein the specific content of the detection result according to the fault in S3 is as follows:
when the vehicle control unit VCU detects that the fault reason is that the battery temperature is too high, the voltage is too high or the communication between the battery management system BMS and the vehicle control unit VCU is lost, the vehicle control unit VCU sends a control command, the vehicle automatically enters a limp mode, meanwhile, the power of a driving motor is limited, and the battery is not allowed to feed back the electric quantity;
when the VCU of the vehicle control unit detects that the failure reason is that the residual electric quantity SOC of the power battery is too low, the vehicle control unit sends a control command to the battery management system BMS, so that the power battery enters a terminal discharge mode, and meanwhile, the power of the driving motor is limited.
3. The method according to claim 1, wherein the limiting of the vehicle power in S3 is divided into five stages, starting with a first stage of power limiting, and then performing a second stage of power limiting, wherein the power limiting process does not rebound; the power limitation removing conditions correspond to the five levels and respectively include:
a first level: the power limit condition is not met, namely the power limit can be removed after the fault is eliminated;
second, third and fourth grades: after the fault is eliminated, removing the power limitation when the voltage of the monomer to be charged is greater than the lowest allowable discharge voltage of the power battery;
and five grades: and after the fault is eliminated, the limitation still cannot be removed, the BMS control program of the battery management system is refreshed after the fault is required to be repaired, and the power limitation is removed when the voltage of the to-be-charged monomer is greater than the lowest allowable discharge voltage of the power battery after the fault is activated.
4. The method for emergency treatment of the power battery fault of the new energy automobile according to claim 2, wherein during the power battery end discharge mode, the priority of the strategy used by the battery management system BMS is as follows:
the discharge protection strategy takes precedence over the discharge limiting strategy; the cell voltage control strategy takes precedence over the total voltage control strategy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010353437.9A CN111497869A (en) | 2020-04-29 | 2020-04-29 | Emergency processing method for new energy automobile power battery fault |
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| CN202010353437.9A CN111497869A (en) | 2020-04-29 | 2020-04-29 | Emergency processing method for new energy automobile power battery fault |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112373473A (en) * | 2020-11-17 | 2021-02-19 | 江苏众星摩托有限公司 | Automatic electric motor car of driving |
| CN114379371A (en) * | 2022-02-18 | 2022-04-22 | 奇瑞商用车（安徽）有限公司 | BMS-based electric vehicle low-power working condition high-voltage control method |
| CN114995164A (en) * | 2022-08-03 | 2022-09-02 | 武汉维泰信息科技有限公司 | New energy automobile safety early warning method and device based on Internet of things |
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| JP2020048391A (en) * | 2018-09-21 | 2020-03-26 | 株式会社豊田自動織機 | Travel control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112373473A (en) * | 2020-11-17 | 2021-02-19 | 江苏众星摩托有限公司 | Automatic electric motor car of driving |
| CN114379371A (en) * | 2022-02-18 | 2022-04-22 | 奇瑞商用车（安徽）有限公司 | BMS-based electric vehicle low-power working condition high-voltage control method |
| CN114379371B (en) * | 2022-02-18 | 2023-07-25 | 奇瑞商用车（安徽）有限公司 | BMS-based electric automobile low-power working condition high-voltage control method |
| CN114995164A (en) * | 2022-08-03 | 2022-09-02 | 武汉维泰信息科技有限公司 | New energy automobile safety early warning method and device based on Internet of things |
| CN114995164B (en) * | 2022-08-03 | 2022-12-02 | 武汉维泰信息科技有限公司 | New energy automobile safety early warning method and device based on Internet of things |
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