KR102635656B1 - Fire Detection System for Electric Vehicle and its Controlling Method for the same - Google Patents

Abstract

One embodiment of the present invention provides a navigation system that determines and filters intrusive vehicles, comprising: a vehicle driving data collection unit that collects driving data of vehicles to form a data set; a cutting-in vehicle determination unit that determines a cutting-in vehicle among the vehicles using the collected data set; A navigation system can be provided, including a cutting-in vehicle filtering unit that generates speed data for each driving section based on normal vehicles excluding the cutting-in vehicle.

Description

Electric vehicle fire detection system and electric vehicle control method using the same {Fire Detection System for Electric Vehicle and its Controlling Method for the same}

This embodiment relates to a system for detecting fire in an electric vehicle and a method for controlling an electric vehicle using the same, and relates to a technology that can prevent fire in an electric vehicle by collecting and monitoring information inside the vehicle in real time.

Due to the global movement towards carbon neutrality, the production of internal combustion engine vehicles is decreasing, and the production of electric vehicles is increasing.

Since dozens to thousands of battery cells are installed in an electric vehicle, there are technical limitations in that the physical distance/density of battery cells is high, and when a fire occurs, the speed at which the fire spreads is fast and it is difficult to extinguish it. For example, in the case of electric vehicles using lithium-ion batteries, it takes several hours to completely extinguish a fire.

In addition, according to the conventional technology, there were technical limitations in that the occupants were unable to properly prepare due to power cut-off due to a fire in an electric vehicle, and the cause of the fire could not be properly identified due to burnout of the electronic circuit.

Conventional technology, such as Korean Patent Publication KR 10-2336030 B1, must include a separate camera device to detect fire in an electric vehicle, so the space inside the electric vehicle is limited and the fire must be detected by analyzing the acquired images. There is a problem. In addition, according to the conventional technology, the specificity of the drivetrain fire and the battery fire within the vehicle are not taken into consideration, so there is a limitation in that the accuracy of fire detection is low.

From this perspective, technology is required to detect fires in electric vehicles in real time and improve the accuracy of fire detection by reflecting the vehicle characteristics of electric vehicles.

Against this background, the purpose of this embodiment is to provide, in one aspect, a vehicle fire management system that can accurately and quickly determine a fire in an electric vehicle by monitoring vehicle data of an electric vehicle in real time, and an electric vehicle including the same.

The purpose of this embodiment is to provide a vehicle fire management system that can more accurately determine the state of an electric vehicle by combining temperature data and frequency data of the electric vehicle, and an electric vehicle including the same, to determine the state of the electric vehicle. .

The purpose of this embodiment is, from another aspect, to provide a vehicle fire management system that can prevent fires by immediately detecting changes in the state of the battery by measuring the state of the surface of the battery of an electric vehicle using radio waves, and an electric vehicle including the same. is to provide.

In order to achieve the above-described object, an embodiment of the present invention provides an electric vehicle that collects vehicle data to determine a fire in the vehicle, comprising: a motor that provides driving force to the electric vehicle; an inverter that controls the speed of the motor; a first battery providing power to the motor and the inverter; An onboard charger that is connected to the first battery and converts externally transmitted alternating current power into direct current power; and a vehicle fire management system that monitors vehicle data generated by the motor, the inverter, the first battery, and the onboard charger and determines a fire in the electric vehicle.

The electric vehicle may further include a battery deterioration detection sensor that measures the state of the first battery, and the battery deterioration detection sensor may measure the temperature of the first battery by transmitting high frequency waves to the surface of the first battery.

The electric vehicle further includes a battery deterioration detection sensor that measures the state of the first battery, wherein the battery deterioration detection sensor transmits a radio wave to the surface of the first battery and measures the return time of the radio wave to detect the first battery. You can determine the expansion of the battery.

In an electric vehicle, the vehicle fire management system can acquire frequency information measured by the battery deterioration detection sensor, separate a plurality of frequencies through Fourier transform, and determine a fire in the vehicle based on the obtained frequency components.

In an electric vehicle, the vehicle fire management system may collect the vehicle data through one or more communication methods among CAN communication, LIN communication, and Ethernet communication.

The electric vehicle further includes a power charging port that is connected to the onboard charger and receives external AC power, and the vehicle fire management system measures the frequency component of the power charging port and, if it is included in a preset frequency range, It can be determined that a fire did not occur.

In an electric vehicle, the vehicle data may include data regarding an error state, battery temperature, charging state, voltage state, and current state of the first battery.

In an electric vehicle, the vehicle fire management system can determine that a fire has occurred only when the temperature data of the first battery exceeds the reference temperature and the frequency of the inverter or the motor exceeds the reference frequency.

A converter that adjusts the level of the output voltage of the first battery in an electric vehicle; And it may further include a second battery that stores power based on the voltage adjusted by the converter.

In an electric vehicle, the vehicle data can be transmitted to an external server using the LTE module of the vehicle fire management system, or the vehicle data can be transmitted to an external server using the communication module of an AVN device formed separately from the vehicle fire management system. there is.

In order to achieve the above-described object, another embodiment of the present invention provides a method for detecting and controlling a fire in an electric vehicle, in which vehicle data generated by the inverter, motor, converter, battery, and onboard charger inside the electric vehicle are stored in the vehicle. Collecting from the fire management system; A method for controlling an electric vehicle can be provided, including the step of the vehicle fire management system determining whether a fire has occurred based on the vehicle data.

In the electric vehicle control method, when the vehicle fire management system determines that a fire has occurred, controlling the electric vehicle to spray fire extinguishing liquid at the point where the fire occurred and unlock the door; And it may further include transmitting the vehicle data from the vehicle fire management system to an external server through wireless communication.

In an electric vehicle control method, the motor provides driving force to the electric vehicle, the inverter regulates the speed of the motor, the battery provides power to the motor and the inverter, and the onboard charger is connected to the battery to provide external power. The AC power transmitted from can be converted to DC power.

In the electric vehicle control method, the electric vehicle further includes a battery deterioration detection sensor that transmits high frequencies to the surface of the battery, and the vehicle fire management system monitors the frequency data measured by the battery deterioration detection sensor to set a preset reference frequency. If it exceeds this, it can be determined that a fire has occurred.

In the electric vehicle control method, the electric vehicle further includes a battery deterioration detection sensor that transmits radio waves to the surface of the battery, and the vehicle fire management system monitors the transfer time of the radio waves, and if it is less than a preset standard transfer time, a fire occurs. It can be judged that it has occurred.

In the electric vehicle control method, the vehicle fire management system measures temperature data and frequency data generated from the inverter, the motor, or the converter, determines that the temperature data exceeds the reference temperature, and at the same time, the frequency data exceeds the reference frequency. Only when it exceeds this can it be determined that a fire has occurred in the electric vehicle.

In the electric vehicle control method, the vehicle fire management system measures frequency data generated from the inverter, the motor, or the converter, and when the frequency data includes a frequency component other than a preset frequency component, the inverter and the motor , or the operation of the converter may be judged to be a malfunction.

In the electric vehicle control method, the vehicle fire management system can communicate with an external server through LTE wireless communication and integrate and store the vehicle data.

In order to achieve the above-described object, another embodiment of the present invention provides an electric vehicle that collects vehicle data and detects a fire in the vehicle, comprising: a motor that provides driving force to the electric vehicle; an inverter that controls the speed of the motor; a battery that provides power to the motor and the inverter; An onboard charger that is connected to the battery and converts externally transmitted alternating current power into direct current power; and a plurality of communication devices that individually collect vehicle data of the motor, the inverter, the battery, and the onboard charger, and individually transmit the vehicle data to an external server that detects a fire in the electric vehicle. .

In an electric vehicle, the plurality of communication devices monitor temperature data and frequency data of the motor, the inverter, the battery, and the onboard charger, and send information to the external server only when both the temperature data and the frequency data are outside the normal range. The temperature data and the frequency data can be transmitted.

As described above, according to an embodiment of the present invention, specific units where a fire may occur can be individually monitored according to the characteristics of the internal components of an electric vehicle, and more accurate fire determination is possible.

According to one embodiment of the present invention, the safety of vehicle occupants can be improved because fire detection, fire extinguishing fluid spraying, and door lock release can be linked together.

According to one embodiment of the present invention, when a fire is detected, vehicle data is transmitted to an external server so that information on the starting point and cause of the fire can be easily tracked and managed externally.

Figure 1 is a diagram explaining the data transmission and reception process between the vehicle and an external server in this embodiment.
Figure 2 is a first example configuration diagram illustrating components inside an electric vehicle of this embodiment.
Figure 3 is a second example configuration diagram illustrating components inside the electric vehicle of this embodiment.
Figure 4 is a third example configuration diagram illustrating components inside the electric vehicle of this embodiment.
Figure 5 is a diagram explaining the operation of the vehicle fire management system of this embodiment.
Figure 6 is a diagram explaining the electric vehicle control method of this embodiment.
Figure 7 is a diagram explaining a method of monitoring the state of the battery based on the radio wave arrival time.
Figure 8 is a diagram explaining a method of monitoring the status of the drive system device based on the measurement frequency.

Hereinafter, some embodiments of the present invention will be described in detail through illustrative drawings. When adding reference numerals to components in each drawing, it should be noted that the same components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, in describing the present invention, detailed descriptions of related known configurations or functions that are judged to be likely to obscure the gist of the present invention will be omitted.

Additionally, in describing the components of the present invention, terms such as first, second, a, and b may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being “connected,” “coupled,” or “connected” to another component, that component may be directly connected or connected to that other component, but there is another component between each component. It will be understood that elements may be “connected,” “combined,” or “connected.”

Additionally, the terms 'system', 'server', etc. used in this specification may be defined as a computer program or device that transmits and receives information to a client over a network for data storage and management, but is not limited thereto.

Figure 1 is a diagram explaining the data transmission and reception process between the vehicle and an external server in this embodiment.

Referring to FIG. 1, the data communication method 100 between the vehicle and the external server includes the steps of transmitting vehicle data obtained from the vehicle to the server (S101), transmitting external data stored in the external server to the vehicle (S102), etc. may include.

The step of transmitting vehicle data to the server (S101) may be a step of transmitting driving data of the vehicle 10 to the external server 20. The vehicle 10 may transmit vehicle data to the external server 20 using the LTE module of an internal vehicle fire management system (not shown) or an AVN (Audio Video Navigation) device (not shown).

The vehicle 10 may include a communication device (not shown) for transmitting and receiving data with the external server 20, a data processing device (not shown) for data operation, etc.

The external server 20 can receive vehicle data of the vehicle 10 - for example, data such as the vehicle's running speed, acceleration, direction, location, temperature, frequency, etc. - from the vehicle 10 and store and manage it. .

The external server 20 can store and manage information about the situation of the vehicle - for example, whether a fire has occurred in the vehicle, the possibility of a fire occurring in the vehicle, and the status of the vehicle's components.

The step of transmitting external data to the vehicle (S102) may be a step of transmitting external data collected and managed by the external server 20 to the vehicle. The signal or data transmitted by the external server 20 can detect an abnormal condition of the vehicle - for example, a fire in the vehicle, etc. - and operate the fire extinguishing fluid sprayer inside the vehicle.

The external server 20 is for collecting and managing the status of the vehicle, and may be implemented with a processor or the like inside the vehicle 10 as needed.

Figure 2 is a first example configuration diagram illustrating components inside an electric vehicle of this embodiment.

Referring to Figure 2, the electric vehicle 200 includes a vehicle fire management system 210, a high-voltage battery 220, a battery deterioration detection sensor 230, an inverter 240, a motor 250, a converter 260, and a low-voltage battery. It may include (270), onboard charger (280), power charging port (281), etc.

The vehicle fire management system 210 includes a high-voltage battery 220, a battery deterioration detection sensor 230, an inverter 240, a motor 250, a converter 260, a low-voltage battery 270, an on-board charger 280, Vehicle data generated from the power charging port 281 can be collected and monitored, and a fire in an electric vehicle can be determined.

Here, the vehicle data includes the high-voltage battery (220), battery deterioration sensor (230), inverter (240), motor (250), converter (260), low-voltage battery (270), onboard charger (280), and power charging port ( 281) may be data related to the operation - for example, temperature data, frequency data, rotational speed data, etc. - and may be data measured by a sensor (not shown) included in the vehicle.

Additionally, vehicle data may include data regarding the error state, battery temperature, charging state, voltage state, current state, etc. of the high voltage battery 220.

Additionally, the vehicle data may include data regarding the error state, operation state, voltage state, current state, temperature, etc. of the inverter 240, motor 250, converter 260, and onboard charger 280.

The vehicle fire management system 210 records data from control devices (230, 240, 250, 260, 220, 270, 280, 281) through CAN (Controller Area Network) communication, LIN (Local Interconnect Network) communication, and Ethernet ( You can collect vehicle data through one or more communication methods (Ethernet) and monitor the status of each control device. Additionally, the vehicle fire management system 210 can verify errors in the collected data by comparing the collected data with data stored in the vehicle fire management system.

The vehicle fire management system 210 may acquire frequency information measured by the battery deterioration detection sensor 230, separate a plurality of frequencies through Fourier transform, and determine a vehicle fire based on the obtained frequency components. For example, if a frequency component higher than the reference frequency is measured, it may be determined that a fire has occurred in the vehicle, but the vehicle is not limited to this and various fire judgment standards may be set.

The vehicle fire management system 210 measures frequency components generated from the inverter 240, motor 250, converter 260, onboard charger 280, and power charging port 281, and includes them in the preset frequency range. If it does, it can be determined that a fire has not occurred, and if it is not within the preset frequency range, it can be determined that a fire has occurred. Here, the preset frequency range is the frequency range of normal operation and can be set differently depending on the characteristics of each device.

The vehicle fire management system 210 may determine that a fire has occurred when the temperature data of the high voltage battery 220 exceeds the standard temperature and the frequency of the inverter 240 or motor 250 exceeds the standard frequency. .

The vehicle fire management system 210 transmits vehicle data to an external server (not shown) using an internal LTE module, or uses a communication module of an AVN device (not shown) formed separately from the vehicle fire management system to transmit vehicle data to an external server (not shown). can be transmitted to an external server.

The high voltage battery 220 may be a battery for storing electrical energy and delivering the electrical energy to the inverter 240, motor 250, converter 260, onboard converter 280, etc. The high voltage battery 220 may be defined as a first battery, etc., as needed.

The battery deterioration detection sensor 230 may be a sensor that measures the state of the high voltage battery 220. Since the probability of fire is high in the high-voltage battery 220, which has a relatively high voltage, it is necessary to first monitor the temperature, expansion, abnormal operation, etc. of the high-voltage battery 220.

The battery deterioration detection sensor 230 can measure the temperature of the high voltage battery 220 by transmitting high frequency waves to the surface of the high voltage battery 220.

The battery deterioration detection sensor 230 can determine expansion of the high-voltage battery 220 by transmitting radio waves to the surface of the high-voltage battery 220 and measuring the return time of the radio waves. Before the vehicle fire management system 210 integrates and manages vehicle data, the battery deterioration detection sensor 230 can first determine whether the battery is on fire.

The inverter 240 may be a device for controlling the speed of a motor. The converter 260 is connected between the high voltage battery 220 and the motor 250 and can adjust the rotational speed (RPM) of the motor or control the rotational force. Additionally, the inverter 240 may serve to convert alternating current power and direct current power.

The motor 250 may be any motor to provide driving force to the electric vehicle. The motor 250 may generate movement of the vehicle by transmitting rotational force to the wheels.

The converter 260 may be a device that adjusts the level of the output voltage of the high-voltage battery 220, and may adjust the level of the output voltage according to the operating conditions of the low-voltage battery 270.

The low-voltage battery 270 may be a battery that stores power based on the voltage adjusted by the converter 260. The low-voltage battery 270 may be defined as a second battery, etc., as needed.

The onboard charger 280 is connected to the high voltage battery 220 and can convert alternating current power delivered from the outside through the power charging port 281 into direct current power.

The power charging port 281 may be connected to the onboard charger 280 or the battery deterioration detection sensor 230 and may be a port for transmitting AC power supplied from the outside.

Figure 3 is a second example configuration diagram illustrating components inside the electric vehicle of this embodiment.

Referring to FIG. 3, the electric vehicle 200 may further include a battery management system 221, a vehicle control unit 271, etc.

The electric vehicle 200 does not include the vehicle fire management system 210, which is in the form of a single integrated controller, but may include one or more individual communication devices (not shown) corresponding to the characteristics of each control device.

The communication device (not shown) may be implemented as included in the battery management system 221, vehicle control unit 271, onboard charger 280, etc.

The communication device (not shown) individually collects vehicle data such as the inverter 240, motor 250, battery 220, 270, and onboard charger 280, detects fire in the electric vehicle, and sends the information to an external server. Vehicle fire information can be transmitted individually.

The battery management system 221 may be defined as a BMS (Battery Monitoring System) and may be a device that measures chemical characteristics (e.g., charging capacity, lifespan, usage time, etc.) based on the electrical amount of the battery. . The battery management system 221 can detect fires and extinguish fires by attaching various sensors to locations where battery fires may occur.

The vehicle control unit 271 can be defined as a VCU (Vehicle Control Unit) and can control the available power of the battery.

The communication device (not shown) monitors temperature data and frequency data of the inverter 240, motor 250, battery 220, 270, and onboard charger 280, and ensures that both temperature data and frequency data are within the normal range. The temperature data and frequency data can be transmitted to an external server only when it is outside of .

The communication device (not shown) of FIG. 3 can implement the same functions as the vehicle fire management system 210 of FIG. 2 described above, but does not integrate and manage vehicle data, but rather detects vehicle data and performs fire management according to the characteristics of individual control devices. Detection and extinguishment can be performed.

Figure 4 is a third example configuration diagram illustrating components inside the electric vehicle of this embodiment.

Referring to FIG. 4 , the electric vehicle 200 may further include an AVN device 290.

The AVN device 290 can perform audio, video, navigation functions, and telematics communication.

The electric vehicle 200 can transmit vehicle data to an external server using the LTE module of the vehicle fire management system 210, but transmits vehicle data to an external server using the communication module of the AVN device 290, which is formed separately from the vehicle fire management system. It can be sent to the server.

Figure 5 is a diagram explaining the operation of the vehicle fire management system of this embodiment.

Referring to FIG. 5, the vehicle fire management system 300 may include a vehicle data collection unit 310, a fire detection unit 320, an emergency notification unit 330, etc.

The vehicle data collection unit 310 collects data from devices such as the inverter 351, converter 352, high-voltage battery 353, and motor 354, or various sensors such as temperature sensors and vibration sensors (not shown). Data can be collected from.

The vehicle data collection unit 310 can collect and store internal data of the vehicle, and can collect and store diagnostic data diagnosed by an external server (not shown) or by itself.

The vehicle data collection unit 310 collects data from controllers (inverter, converter, high-voltage battery, low-voltage battery, motor, etc.) closely related to fire inside the vehicle through the vehicle network (CAN, LIN, Ethernet, etc.) in real time. ) can be collected.

The fire detection unit 320 can detect fire through a battery fire monitoring unit 341, a drivetrain fire monitoring unit 342, a charging fire monitoring unit 343, and a fire extinguishing agent sprayer 344.

Since the characteristics of each component of an electric vehicle are different, fires can be prevented more effectively by monitoring fires by type of unit where a fire may occur.

The battery fire monitoring unit 341 can determine whether there is a fire using a battery deterioration detection sensor.

Since the drive system fire monitoring unit 342 and the charging fire monitoring unit 343 generate fixed frequency and variable frequency components during the operation of the controller, it is possible to determine whether there is a fire through frequency component analysis.

When it is determined that a fire has occurred in an electric vehicle, the fire extinguishing liquid sprayer 344 can perform extinguishing work by spraying fire extinguishing liquid at the location where the fire occurred. Since fire extinguishment may not be sufficiently completed by spraying fire extinguishing liquid, an additional step may be taken to unlock the vehicle's door so that the vehicle occupants can escape.

In the event of a fire, the emergency notification unit 330 transmits the already collected data to the external DB server 361, the user's mobile device 362, the fire department server 363, etc. through a network that can be connected to the outside. The cause of the fire can be determined using fire-related data collected through the emergency notification unit 330.

The emergency notification unit 330 is in a standby state when a fire does not occur inside the vehicle, and after detecting a fire, data before and after the fire occurs is sent to the DB server 361, the user's mobile device 362, It can be transmitted to the fire headquarters server (363), etc.

In FIG. 5, the battery fire monitoring unit 341, the drivetrain fire monitoring unit 342, and the charging fire monitoring unit 343 are capable of performing the function of the fire detection unit 320, and are conceptually or physically separate separate entities. It may be a device, but may be implemented by being included in the fire detection unit 320.

Figure 6 is a diagram explaining the electric vehicle control method of this embodiment.

Referring to FIG. 6, the electric vehicle control method 400 includes a vehicle data collection step (S401), a step of checking the fire state inside the vehicle (S402), a step of determining whether a fire has occurred (S403), a fire extinguishing liquid spraying step, and a door lock unlocking step ( S404), vehicle data/sensor information external transmission step (S405), etc.

The vehicle data collection step (S401) may be a step of collecting vehicle data generated by the inverter, motor, converter, battery, onboard charger, etc. inside the electric vehicle through the vehicle network.

The vehicle fire management system (not shown) records data from controllers (inverter, converter, high-voltage battery, low-voltage battery, motor, etc.) closely related to fire inside the vehicle through the vehicle network (CAN, LIN, Ethernet) in real time. etc.) can be collected.

Additionally, in addition to the status of the controller within the vehicle, sensor data can be collected through various sensors at locations where a fire may occur.

If a fire does not occur in the vehicle, vehicle internal data and diagnostic data can be collected at all times, and various sensor data can also be checked and collected at any time.

The step of checking the fire state inside the vehicle (S402) may be a step of checking the fire state of the vehicle based on vehicle data of the battery inside the vehicle.

A separate battery deterioration detection sensor (not shown) can be installed adjacent to the battery pack to detect the temperature of the battery and physical changes in the battery pack (e.g., expansion, etc.) to determine whether there is a fire.

The battery deterioration detection sensor can always transmit high frequency waves to the area adjacent to the battery to measure temperature. If there is no change in the temperature of the battery, the frequency component of the high frequency generated by the deterioration detection sensor may also remain unchanged. However, as the temperature of the battery rises, the frequency may become higher, and as the temperature falls, the frequency may become lower. Using these characteristics of battery temperature-frequency correlation, changes in the internal temperature of the battery can be determined.

In addition, the battery deterioration monitoring sensor can calculate the distance between a point of the deterioration detection sensor and the adjacent surface of the battery by measuring the arrival time of radio waves. If the battery pack expands due to an increase in battery temperature, the distance between the two previously measured points narrows, and if it contracts, the distance increases. Using the characteristics of the battery temperature-expansion length correlation, it is possible to determine whether the battery is abnormal based on the distance between two points.

The step of checking the fire status inside the vehicle (S402) may be a step of checking the fire status of the vehicle based on vehicle data of the drive system devices inside the vehicle - for example, motors, inverters, and converters.

You can compare the CAN data of the motor, inverter, and converter with the standard voltage value and standard current value, and if the CAN data exceeds the standard value, the fire management system can determine that a fire has occurred.

External deterioration of power modules (motor, inverter, converter) can also be detected through the temperature sensor of the fire management system. If the temperature of the power module rises above the normal range, it can be recognized that a fire has occurred in the module.

Since fixed and variable high-frequency components are generated during the operation of the power module (motor, inverter, and converter), the fire management system can determine whether a fire has occurred in the motor, inverter, or converter through frequency component analysis.

An inverter or converter may be a gate circuit that controls a phase conversion operation so that the direct current voltage supplied from the battery is output as voltage and current with variable frequency. At this time, it is possible to determine whether a vehicle is on fire by receiving naturally occurring high-frequency components from the fire management system and performing frequency analysis.

The fire management system can recognize a fire or malfunction of the inverter, converter, or motor when an abnormal frequency component other than the predefined frequency component is detected - for example, inverter/converter operation frequency according to speed, motor operation frequency according to speed. there is. If an abnormal frequency component other than the predefined frequency component is detected, it can be recognized as a fire or malfunction of the motor.

The fire management system can improve the accuracy of fire judgment by checking the two states of temperature data and frequency data to determine whether a fire has occurred.

The step of checking the fire status inside the vehicle (S402) may be a step of checking the fire status of the vehicle based on vehicle data of the onboarder charger inside the vehicle.

You can compare the CAN data of the onboard charger (OBC) with the reference voltage value and reference current value. If the CAN data exceeds the standard value, the fire management system can determine that a fire has occurred.

The external deterioration of the onboard charger (OBC) can be detected through the temperature sensor of the fire management system. If the temperature of the onboard charger (OBC) rises above the normal range, it can be recognized that a fire has occurred in the relevant module.

The onboard charger (OBC) may be a gate circuit that converts AC power to DC power when using a slow charger that supplies general commercial AC power - for example: 220V - to the vehicle to charge it. At this time, naturally occurring high-frequency components can be received from the fire management system and frequency analysis can be performed to determine a fire.

The fire management system can recognize a fire or malfunction of the onboard charger (OBC) when an abnormal frequency component other than the predefined frequency component - for example, the OBC operating frequency according to charging - is detected.

The fire management system can determine whether a fire has occurred by checking both the status of temperature data and frequency data.

The step of determining whether a fire has occurred (S403) may be a step of determining that a fire has occurred inside the vehicle if a preset algorithm is satisfied.

If a vehicle fire has not occurred, the vehicle data collection step (S401) can be repeated, and if a vehicle fire has occurred, the fire extinguishing liquid spraying and door lock unlocking steps (S404) can be performed.

In the fire extinguishing liquid spraying and door lock unlocking step (S404), if the vehicle fire management system determines that a fire has occurred, the electric vehicle may be controlled to spray fire extinguishing liquid at the point where the fire occurred and release the door lock. After spraying fire extinguishing fluid and unlocking the door, the current location of the vehicle, the customer's status, and the vehicle's status can be transmitted to the fire department server to make an emergency call.

The fire extinguishing liquid spray and door lock release step (S404) independently recognizes fire in the battery and power module (motor, inverter, converter), sprays fire extinguishing liquid at the point of fire occurrence, and simultaneously releases all vehicle locks to reduce the risk of fire to vehicle passengers. You can control the vehicle allowing it to leave the area.

The vehicle data/sensor information external transmission step (S405) may be a step in which the vehicle fire management system transmits vehicle data or sensor data to an external server through wireless communication.

Figure 6 is for illustrating the fire detection and electric vehicle control method of this embodiment, and some of each step may be omitted or the order may be changed.

The vehicle interior status check step (S403) and the fire determination step (S403) of FIG. 6 can be integrated and implemented as a single fire monitoring step.

Figure 7 is a diagram explaining a method of monitoring the state of a battery based on radio wave arrival time.

Referring to FIG. 7, a method 500 of monitoring the state of the battery based on the radio wave arrival time according to this embodiment can be confirmed.

Electric vehicles include a battery deterioration detection sensor that transmits radio waves to the surface of the battery, and the vehicle fire management system monitors the radio wave transfer time, and can determine that a fire has occurred if it is less than a preset standard transfer time.

The radio wave arrival time may be the radio wave return time divided by 2. The travel time and distance of the radio waves transmitted from the battery deterioration detection sensor may be inversely proportional, and as the arrival time of the radio waves decreases, the surface expansion of the battery may increase.

Therefore, the vehicle fire management system can monitor the surface expansion of the battery by monitoring the arrival time of radio waves.

Until the first time (t1), the radio wave arrival time may be within a certain range of the average radio wave arrival time (T_AVG), but after the first time (t1), the radio wave arrival time may be reduced.

The radio wave arrival time begins to decrease until the second time (t2), and can reach the reference radio wave arrival time (T_REF). If the radio wave arrival time is more than the standard radio wave arrival time (T_REF), it can be defined as a normal state, and if it is less than the standard radio wave arrival time (T_REF), it can be defined as an abnormal state.

The vehicle fire management system monitors the arrival time of radio waves or the return time of radio waves, and can determine that a fire has occurred if it is less than the preset standard radio wave arrival time or standard return time.

In FIG. 7, the average radio wave arrival time (T_AVG) and the reference radio wave arrival time (T_REF) may be set differently depending on fire judgment conditions, vehicle status, etc.

Figure 8 is a diagram explaining a method of monitoring the status of the drive system device based on the measurement frequency.

Referring to FIG. 8, a method 600 for monitoring the status of a drive system device based on the measurement frequency according to this embodiment can be confirmed.

The vehicle fire management system measures frequency data generated from drivetrain devices such as inverters, motors, or converters, and malfunctions the inverter, motor, or converter if the frequency data includes frequency components other than the preset frequency components. Alternatively, it may be determined that a fire has occurred.

In addition, the vehicle fire management system measures temperature data and frequency data generated from the inverter, motor, or converter, and a fire in an electric vehicle occurs only when the temperature data exceeds the standard temperature and at the same time, the frequency data exceeds the standard frequency. It can be judged as follows. The vehicle management system can improve the accuracy of fire judgment by dually monitoring temperature data and frequency data.

The frequency sensed by the vehicle fire management system may include multiple frequency components (f1, f2, etc.), and the frequency measuring device can detect high-frequency signals by separating the multiple frequency components into individual components through Fourier transform, etc. However, it is not limited to this.

Claims (14)

In an electric vehicle that collects vehicle data to determine if the vehicle is on fire,
A motor that provides driving force to the electric vehicle;
an inverter that controls the speed of the motor;
a first battery providing power to the motor and the inverter;
An onboard charger that is connected to the first battery and converts externally transmitted alternating current power into direct current power; and
A vehicle fire management system that monitors vehicle data generated by the motor, the inverter, the first battery, and the onboard charger and determines a fire in the electric vehicle,
The vehicle fire management system is an electric vehicle that determines whether a fire has occurred by measuring the frequency component of a signal generated from at least one selected from the group consisting of the motor, the inverter, the first battery, and the onboard charger. According to paragraph 1,
Further comprising a battery deterioration detection sensor that measures the state of the first battery,
The battery deterioration detection sensor transmits high frequency waves to the surface of the first battery to measure the temperature of the first battery. According to paragraph 1,
Further comprising a battery deterioration detection sensor that measures the state of the first battery,
The battery deterioration detection sensor transmits radio waves to the surface of the first battery and measures the return time of the radio waves to determine expansion of the first battery. According to paragraph 2,
The vehicle fire management system acquires frequency information measured by the battery deterioration detection sensor, separates a plurality of frequencies through Fourier transform, and determines a fire in the vehicle based on the obtained frequency components. According to paragraph 1,
It further includes a power charging port that is connected to the onboard charger and receives external AC power,
The vehicle fire management system measures the frequency component of the power charging port and determines that a fire has not occurred if it falls within a preset frequency range. According to paragraph 1,
The vehicle fire management system determines that a fire has occurred only when the temperature data of the first battery exceeds the reference temperature and the frequency of the inverter or the motor exceeds the reference frequency. According to paragraph 1,
a converter that adjusts the level of the output voltage of the first battery; and
An electric vehicle further comprising a second battery that stores power based on the voltage adjusted by the converter. In a method for detecting and controlling a fire in an electric vehicle,
Collecting vehicle data about signals generated by the inverter, motor, converter, battery, and onboard charger inside the electric vehicle from a vehicle fire management system; and
An electric vehicle control method comprising the step of the vehicle fire management system measuring a frequency component of the vehicle data to determine whether a fire has occurred. According to clause 8,
The electric vehicle further includes a battery deterioration detection sensor that transmits high frequency waves to the surface of the battery,
The vehicle fire management system monitors the frequency data measured by the battery deterioration detection sensor and determines that a fire has occurred when it exceeds a preset reference frequency. According to clause 8,
The electric vehicle further includes a battery deterioration detection sensor that transmits radio waves to the surface of the battery,
The vehicle fire management system monitors the radio wave transfer time and determines that a fire has occurred if it is less than a preset standard transfer time. According to clause 8,
The vehicle fire management system measures temperature data and frequency data generated from the inverter, the motor, or the converter,
An electric vehicle control method that determines that a fire has occurred in the electric vehicle only when the temperature data exceeds the reference temperature and at the same time the frequency data exceeds the reference frequency. According to clause 8,
The vehicle fire management system measures frequency data generated from the inverter, the motor, or the converter,
A method for controlling an electric vehicle, wherein when the frequency data includes a frequency component other than a preset frequency component, the operation of the inverter, the motor, or the converter is determined to be a malfunction. In an electric vehicle that collects vehicle data and detects a fire in the vehicle,
A motor that provides driving force to the electric vehicle;
an inverter that controls the speed of the motor;
a battery that provides power to the motor and the inverter;
An onboard charger that is connected to the battery and converts externally transmitted alternating current power into direct current power; and
An electric vehicle comprising a plurality of communication devices that individually collect frequency components of vehicle data for signals from the motor, the inverter, the battery, and the onboard charger, and individually transmit them to an external server that detects a fire in the electric vehicle. . According to clause 13,
The plurality of communication devices monitor temperature data and frequency data of the motor, the inverter, the battery, and the onboard charger, and send the temperature data to the external server only when both the temperature data and the frequency data are outside the normal range. An electric vehicle that transmits data and the frequency data.