CN110803024A - Collision protection control method and system for electric vehicle - Google Patents
Collision protection control method and system for electric vehicle Download PDFInfo
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- CN110803024A CN110803024A CN201810799512.7A CN201810799512A CN110803024A CN 110803024 A CN110803024 A CN 110803024A CN 201810799512 A CN201810799512 A CN 201810799512A CN 110803024 A CN110803024 A CN 110803024A
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention relates to the technical field of vehicle protection, in particular to a collision protection control method and system for an electric vehicle. The system comprises a signal processing module and a signal detection module for detecting the voltage and insulation value information before and after collision of the battery system, wherein the input end of the signal processing module is connected with the signal detection module so as to obtain the voltage value of the battery system before and after collision of the vehicle and the insulation value of the battery system after collision; the signal processing module judges whether the voltage variation of the battery system before and after the collision is not less than the upper limit of the voltage variation or the insulation value of the battery system after the collision is not more than the set insulation value according to the acquired information, controls high-voltage power down, realizes protection control after the collision of the electric vehicle, and solves the problem that the vehicle has use risk due to inaccurate vehicle control caused by the fact that the existing electric vehicle collision judging condition is not accurate to the battery system.
Description
Technical Field
The invention relates to the technical field of vehicle protection, in particular to a collision protection control method and system for an electric vehicle.
Background
Nowadays, environmental pollution, energy crisis and other factors push the high-speed development of the electric automobile industry, and especially, new energy passenger cars used in the public transportation field show explosive growth. Compared with other electric automobiles, the passenger car has more passengers, complex use environment, more strict requirements on safety and easy occurrence of collision accidents. The particularity of the electric motor coach in the collision is represented in two aspects: firstly, the high-energy and large-mass power battery system and the high-voltage accessories thereof are extruded and damaged between the high-energy and large-mass power battery system and a vehicle body in collision, which may cause fire, explosion and the like caused by short circuit of a high-voltage loop; and secondly, potential falling is caused after the high-voltage driving system is collided, the instantaneous insulation performance is rapidly reduced, and the high-voltage driving system may be in direct or indirect contact with passengers or rescuers to cause electric shock injury.
The collision safety of the electric motor coach needs to be started from two aspects: firstly, a reasonable mechanical structure needs to be fully considered in vehicle design to meet the protection requirements of drivers and passengers and the protection requirements of a vehicle body structure, such as special high-pressure cabin design, anti-collision structure design and the like; secondly, collision occurs under an uncontrollable condition, and basic requirements on electrical safety are met by designing a set of reliable and safe collision protection and vehicle control method. There is a patent document CN104276043B in chinese patent publication, which discloses a vehicle collision protection system, including an acceleration sensing unit and an embedded processing unit, where the embedded processing unit is connected to the acceleration sensing unit, the acceleration sensing unit is used to detect the acceleration of the vehicle and send a collision protection signal to the embedded processing unit when the acceleration of the vehicle is greater than or equal to a preset acceleration protection threshold, and the embedded processing unit is used to control the output and/or input of high-voltage power of the cut-off system when receiving the collision signal, so as to avoid the vehicle from being threatened by the high-voltage power after a collision fault occurs, thereby being able to ensure personal safety.
However, such a collision protection system does not conform to actual use of the vehicle, and there is no countermeasure for making the vehicle respond differently depending on the influence of the actual collision situation on the battery system, and there is a case where the collision does not affect the normal operation of the battery system, resulting in a risk of use of the vehicle while the vehicle is traveling.
Disclosure of Invention
The invention aims to provide a collision protection control method and system for an electric vehicle, which are used for solving the problem that the vehicle has use risk due to inaccurate vehicle control caused by the fact that the existing collision judgment condition of the electric vehicle is not accurate to a battery system.
In order to realize the protection control after the electric vehicle collides, the problem that the vehicle has use risks due to the fact that the vehicle control is inaccurate because the existing electric vehicle collision judgment condition is not accurate to a battery system is solved. The invention provides a collision protection control method of an electric vehicle, which comprises the following steps:
1) acquiring voltage values of a battery system before and after a vehicle collision and/or an insulation value of the battery system after the vehicle collision;
2) judging the relation between the voltage variation of the battery system before and after the collision and the upper limit of the voltage variation, or the relation between the insulation value of the battery system after the collision and the set insulation value;
3) and if the voltage variation of the battery system before and after the collision is not less than the upper limit of the voltage variation, or the insulation value of the battery system after the collision is not more than the set insulation value, controlling the high-voltage power down.
Further, in order to prevent the vehicle from safely traveling when the impact of the collision is small, the relationship between the voltage variation of the battery systems before and after the collision and the lower limit of the voltage variation is also determined, and if the voltage variation of the battery systems before and after the collision is smaller than the upper limit of the voltage variation and larger than the lower limit of the voltage variation, the driving motor power is controlled to be reduced according to the set ratio.
Further, in order to prevent the occurrence of the phenomenon that the vehicle is out of control due to the fact that the vehicle steering and a brake system are failed due to sudden vehicle high-voltage power failure under the condition that the vehicle still runs at a high speed after collision, vehicle speed information is obtained in the process of controlling high-voltage power down, whether the vehicle speed is greater than a set speed value or not is judged, if yes, the high-voltage power down of a driving motor is only controlled until the vehicle speed is less than the set speed value, and when the vehicle speed is less than the set speed value, the whole vehicle high-voltage.
Further, in order to prevent an alarm caused by false alarm, if the voltage variation of the battery system before and after the collision is not greater than the lower limit of the voltage variation or the insulation value of the battery system after the collision is greater than the set insulation value, false alarm information is output.
The invention provides a collision protection control system of an electric vehicle, which comprises a signal processing module and a signal detection module, wherein the signal detection module is used for detecting the voltage and insulation value information before and after collision of a battery system; and the signal processing module judges whether the voltage variation of the battery system before and after the collision is not less than the upper limit of the voltage variation or the insulation value of the battery system after the collision is not more than the set insulation value according to the acquired information, and controls high-voltage power down.
Further, in order to prevent the vehicle from running safely when the impact of the collision is small, the signal processing module further judges the magnitude relation between the voltage variation of the battery systems before and after the collision and the lower limit of the voltage mutation, and if the voltage variation of the battery systems before and after the collision is smaller than the upper limit of the voltage mutation and larger than the lower limit of the voltage mutation, the signal processing module controls the power of the driving motor to be reduced according to a set proportion.
Further, in order to prevent the occurrence of the phenomenon that the vehicle is out of control due to the fact that the vehicle steering and a braking system are out of work due to sudden vehicle high-voltage power failure under the condition that the vehicle still runs at a high speed after collision, the signal processing module also acquires vehicle speed information, judges whether the vehicle speed is greater than a set speed value or not according to the vehicle speed information in the process of controlling high voltage and low voltage, only controls the high voltage and the low voltage of the driving motor until the vehicle speed is less than the set speed value if the vehicle speed is greater than the set speed value, and controls the whole vehicle to be powered down.
Further, in order to prevent the alarm caused by false alarm due to other factors, if the voltage variation of the battery system before and after the collision is not more than the lower limit of the voltage variation, or the insulation value of the battery system after the collision is more than the set insulation value, the false alarm information is output.
Drawings
FIG. 1 is a flow chart of a method of collision protection control of an electric vehicle of a voltage embodiment;
fig. 2 is a flowchart of a collision protection control method of an electric vehicle of the insulation embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Voltage embodiment
The voltage embodiment provides a collision protection control system of an electric vehicle, which comprises a signal processing module and a signal detection module for detecting voltage information before and after collision of a battery system, wherein the input end of the signal processing module is connected with the signal detection module so as to obtain voltage values of the battery system before and after collision of the vehicle; the signal processing module is used for being in communication connection with a vehicle control unit, and the system executes a collision protection control method of the electric vehicle, as shown in fig. 1, and comprises the following steps:
1) and acquiring voltage values of the battery system before and after the vehicle collides.
2) And judging the relation between the voltage variation of the battery system before and after the collision and the upper limit of the voltage variation.
3) And if the voltage variation of the battery system before and after the collision is not less than the upper limit of the voltage mutation, controlling the high-voltage power-off.
The signal detection module CAN be an acquisition module of an original vehicle and is communicated with the signal processing module through a CAN (controller area network), and CAN also be a new acquisition module for acquisition and communication; preferably, the vehicle control unit is connected with corresponding action mechanisms such as a motor controller and a battery management system through CAN communication, corresponding signals CAN be collected through an original signal detection module, and the on-off of a driving motor and a circuit CAN be controlled.
When the vehicle collision is judged, voltage values of the battery systems before and after the vehicle collision are collected, voltage variation of the voltage values of the battery systems before and after the vehicle collision is calculated, and the voltage variation is compared with the voltage variation upper limit and the voltage variation lower limit in a magnitude relation. And when the voltage variation of the battery system before and after the collision is not less than the upper limit of the voltage mutation, controlling the high-voltage power-off. And when the voltage variation of the battery system before and after the collision is smaller than the voltage mutation upper limit and larger than the voltage mutation lower limit, controlling to reduce the power of the driving motor according to a set proportion. And outputting false alarm information when the voltage variation of the battery system before and after the collision is not greater than the lower limit of the voltage mutation.
In addition, in the process of controlling high-voltage power down, whether the vehicle speed is greater than a set speed value or not is also judged, if yes, only the high-voltage power down of the driving motor is controlled until the vehicle speed is less than the set speed value, and when the vehicle speed is less than the set speed value, the whole vehicle high-voltage power down is controlled.
Specifically, the signal processing module transmits a collision signal to a battery management system, the battery management system extracts a system voltage value U1 and a current voltage value U2, ① when | U1-U2 | is not less than 50 (the voltage platform of the electric bus is about 500V, the voltage jump in 30s is 50V, namely the system jump is 10%), the high-voltage loop (components) of the vehicle is considered to be out of order at the moment, and a high-voltage and low-voltage control strategy is executed, ② when | U1-U2 | is not more than 50 and | U1-U2 | is not less than 10 (the voltage platform of the electric bus is about 500V, the voltage jump in 30s is 50V, namely the system jump is 2%), the vehicle control is executed to reduce the power of a driving motor according to a set proportion, the vehicle controller reduces the power request of the motor control unit to 50%, limits the power of the vehicle to run, the vehicle is driven to a safety zone until the vehicle stops and starts to be overhauled, in addition, the vehicle controller transmits the collision information to an instrument panel, and displays the interior fault information and gives an audible and alarm.
Specifically, when a high-voltage reduction control strategy is executed, if a set speed value is 3Km/h, ① when the vehicle speed is greater than 3Km/h, the vehicle control unit controls the motor control unit to execute high-voltage reduction of the driving motor, the output power of the driving motor is 0, because the vehicle speed is faster at the moment, only the driving motor is driven to be under high voltage, the output power is 0, normal high-voltage power supply of operation components such as a steering system and a braking system of the whole vehicle is maintained, the whole vehicle is prevented from being out of control, until the vehicle speed is reduced to be less than or equal to 3Km/h, the vehicle control unit controls the battery management system to execute the operation of disconnecting a high-voltage main loop relay of a power battery, the whole vehicle is powered down, the vehicle stops, and a professional person waits for maintenance in situ.
Specifically, when the agent is U1-U2 < 10, the system false alarm can be judged, a false alarm signal is transmitted to the vehicle control unit, and the vehicle control unit transmits false alarm fault information to an instrument panel to display the false alarm information.
Insulating embodiments
In the insulation embodiment, on the basis of the voltage embodiment, the signal processing module can also acquire the insulation value of the battery system after the collision, and the signal processing module is in communication connection with the vehicle control unit, so that the information can be directly acquired through the battery management system connected with the vehicle control unit.
As shown in fig. 2, on the basis of the voltage embodiment, the criterion for judging the voltage variation and the criterion for judging the magnitude of the insulation value are in a sum/sum relationship; the high-voltage electrification control method comprises the steps that high-voltage electrification is controlled only when the insulation value of the battery system after collision is not larger than the set insulation value, and the high-voltage electrification control method also can be controlled when the voltage change quantity of the battery system before and after collision is not smaller than the voltage sudden change quantity upper limit and the insulation value of the battery system after collision is not larger than the set insulation value; and outputting false alarm information when the insulation value of the battery system after the collision is greater than the set insulation value.
Specifically, the signal processing module transmits a collision signal to a battery management system, the battery management system extracts a current insulation value C, when the C is less than or equal to 5M omega, a vehicle high-voltage loop (part) is considered to have a fault, and a high-voltage reduction control strategy is executed; in addition, the vehicle control unit transmits the slight collision fault information to the instrument panel in the process, displays the fault information and prompts sound and light alarm in the carriage. When C is larger than 5M omega, the system false alarm can be judged, a false alarm signal is transmitted to the vehicle control unit, and the vehicle control unit transmits false alarm fault information to an instrument panel and displays the false alarm information.
The present invention has been described in relation to particular embodiments thereof, but the invention is not limited to the described embodiments. In the thought given by the present invention, the technical means in the above embodiments are changed, replaced, modified in a manner that is easily imaginable to those skilled in the art, and the functions are basically the same as the corresponding technical means in the present invention, and the purpose of the invention is basically the same, so that the technical scheme formed by fine tuning the above embodiments still falls into the protection scope of the present invention.
Claims (8)
1. A collision protection control method of an electric vehicle, characterized by comprising the steps of:
1) acquiring voltage values of a battery system before and after a vehicle collision and/or an insulation value of the battery system after the vehicle collision;
2) judging the relation between the voltage variation of the battery system before and after the collision and the upper limit of the voltage variation, or the relation between the insulation value of the battery system after the collision and the set insulation value;
3) and if the voltage variation of the battery system before and after the collision is not less than the upper limit of the voltage variation, or the insulation value of the battery system after the collision is not more than the set insulation value, controlling the high-voltage power down.
2. The method of claim 1, wherein the relationship between the voltage variation of the battery systems before and after the collision and the lower limit of the voltage variation is further determined, and if the voltage variation of the battery systems before and after the collision is smaller than the upper limit of the voltage variation and larger than the lower limit of the voltage variation, the method controls to reduce the power of the driving motor in a set ratio.
3. The collision protection control method of the electric vehicle according to claim 1 or 2, characterized in that vehicle speed information is acquired in the process of controlling the high-voltage low-voltage, whether the vehicle speed is greater than a set speed value is judged, if yes, only the high-voltage low-voltage of the driving motor is controlled until the vehicle speed is less than the set speed value, and when the vehicle speed is less than the set speed value, the whole vehicle high-voltage full-power-down is controlled.
4. The method according to claim 3, wherein the false alarm information is output if the voltage change amount of the battery system before and after the collision is not greater than the lower limit of the voltage variation amount or the insulation value of the battery system after the collision is greater than a set insulation value.
5. The collision protection control system of the electric vehicle is characterized by comprising a signal processing module and a signal detection module for detecting the voltage and insulation value information before and after collision of a battery system, wherein the input end of the signal processing module is connected with the signal detection module so as to obtain the voltage value of the battery system before and after collision of the vehicle and/or the insulation value of the battery system after collision; and the signal processing module judges whether the voltage variation of the battery system before and after the collision is not less than the upper limit of the voltage variation or the insulation value of the battery system after the collision is not more than the set insulation value according to the acquired information, and controls high-voltage power down.
6. The system of claim 5, wherein the signal processing module further determines a relationship between a voltage variation of the battery systems before and after the collision and a lower limit of a voltage variation, and controls the driving motor to reduce the power according to a predetermined ratio if the voltage variation of the battery systems before and after the collision is smaller than the upper limit of the voltage variation and larger than the lower limit of the voltage variation.
7. The collision protection control system of the electric vehicle according to claim 5 or 6, wherein the signal processing module further obtains vehicle speed information, judges whether the vehicle speed is greater than a set speed value or not according to the vehicle speed information in the process of controlling the high-voltage power-down, only controls the high-voltage power-down of the driving motor until the vehicle speed is less than the set speed value if the vehicle speed is greater than the set speed value, and controls the whole vehicle high-voltage power-down when the vehicle speed is less than the set speed value.
8. The collision protection control system of an electric vehicle according to claim 7, wherein if the voltage change amount of the battery system before and after the collision is not more than the voltage variation lower limit or the insulation value of the battery system after the collision is more than the set insulation value, the false alarm information is output.
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| CN201810799512.7A CN110803024B (en) | 2018-07-19 | 2018-07-19 | Collision protection control method and system for electric vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114148173A (en) * | 2021-12-29 | 2022-03-08 | 湖南省怀化工业中等专业学校(湖南省怀化工业高级技工学校) | Collision early warning and safety protection system and method for power battery pack of electric automobile |
| CN114670629A (en) * | 2020-12-24 | 2022-06-28 | 上海汽车集团股份有限公司 | Electric vehicle collision electric shock protection system and electric vehicle |
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