KR20140020499A - Method for protecting high voltage battery of hev - Google Patents

Abstract

The present invention provides a method for protecting a high voltage battery of a hybrid electric vehicle, which early synthetically senses not only a risk element which is directly generated in the high voltage battery placed in the hybrid electric vehicle but also various risk elements of the vehicle and handles the risk elements, thereby preventing the damage to the high voltage battery from direct and indirect risk elements. For this, the method comprises; a step in which a hybrid control unit (HCU) checks an internal risk element of a vehicle, an external risk element, and a direct risk element of a high voltage battery; a step of generating a power supply cutting command of the high voltage battery if the hybrid control unit senses one risk element among the internal risk element of the vehicle, the external risk element, and the direct risk element of the high voltage battery; and a step of cutting a power supply by cutting off a fuse of a safety plug of a power output terminal side of the high voltage battery if a battery management system (BMS) receives the power supply cutting command from the hybrid control unit. [Reference numerals] (10) Battery; (22) Weight sensor; (40) Engine unit; (62) Display unit; (64) Memory; (AA, BB) CAN communication; (CC) Motor unit

Description

Method for Protecting High Voltage Battery of HEV

The present invention relates to a method of protecting a high voltage battery of a hybrid vehicle, and more particularly, to a method of protecting a high voltage battery of a hybrid vehicle for protecting a high voltage battery mounted on a hybrid vehicle from various risk factors generated in the vehicle.

In general, a hybrid electric vehicle (HEV) transmits power to a wheel through a shift function using continuously variable transmission (CVT) by adding an electric throttle control (ETC) to a general gasoline engine and directly connecting an electric motor. It is made in the form of

The behavior of the hybrid vehicle is made by the power supply voltage supplied from the high voltage battery. The hybrid vehicle is controlled to have the highest fuel economy of the gasoline engine in response to the driving situation. By receiving and recharging the battery with the recovery of electric energy by the motor, it is possible to achieve fuel economy improvement compared to a conventional gasoline engine vehicle.

The high-voltage battery provided in such a hybrid vehicle is made of a nickel-hydrogen (Ni-MH) battery having a rated voltage of DC 144V to 300V, and is usually installed inside the trunk room in the form of a combination of a plurality of battery packs.

In addition, a safety plug is connected to the high voltage battery in order to prevent secondary accidents caused by an overcurrent or a fire. Such a safety plug may be configured to supply power from a high voltage battery to a motor unit. An overcurrent protection fuse is included to shut off.

Related arts include Korean Patent Publication No. 2010-0044416 (High Voltage Component Burn Prevention Method for Hybrid Vehicles) (2010.04.30).

However, since the high-voltage battery included in such a conventional hybrid vehicle is mounted inside the luggage compartment, the liquefied material inside the battery when some battery packs are damaged by an excessive load or an impact caused by the loaded cargo. Hazardous gases and liquids may leak, and the likelihood of fire due to overcurrent will increase. In this state, when the driver determines whether the battery is damaged, it is necessary to remove the safety plug for the safety of the vehicle.However, to prevent the danger, even if wearing protective equipment such as discharge gloves, It is not possible to prevent liquid from being applied to the driver, and the risk of explosion cannot be excluded, and it is not easy for the driver to remove the safety plug directly.

Moreover, even if the vehicle's high voltage battery is not directly damaged, the driver may not start the vehicle if a problem occurs in the electrical equipment or mechanical parts installed in the vehicle in various ways depending on the purpose, resulting in an overheating or a fire accident. Although it is possible to shut down the electrical power system by stopping it, indirect overheating or fire conditions in the vehicle are likely to affect the high voltage battery in a short time, and the driver may not take manual safety measures to protect the high voltage battery. There is a problem that there is a limit.

Accordingly, the present invention has been made to improve the above-mentioned conventional problems, and by detecting a variety of risk factors of the vehicle at the early stage as well as the risk factors directly generated by the high voltage battery provided in the hybrid vehicle, the direct, It is an object of the present invention to provide a method for protecting a high voltage battery of a hybrid vehicle, which can prevent the damage of the high voltage battery due to an indirect hazard.

According to an aspect of the present invention, there is provided a method for protecting a high voltage battery of a hybrid vehicle, the hybrid control unit (HCU) checking the internal risk factors of the vehicle, the external risk factors, and the direct risk factors of the high voltage battery, respectively, the hybrid A second step of generating a power supply cutoff command of the high voltage battery when the control unit detects any one of an internal risk factor of the vehicle, an external danger factor and a direct danger factor of the high voltage battery, and a battery management system ( And receiving a power supply cutoff command from the hybrid control unit, cutting off the fuse of the safety plug on the power output end of the high voltage battery to cut off the power supply.

In the first step, the hybrid control unit includes at least one electronic device installed inside and outside the vehicle, sensing information received from at least one sensor device for sensing operation information of a mechanical part, and an engine control unit (ECU). The internal and external hazards of the vehicle on the basis of the diagnostic code information from the motor control unit (MCU), and the external module temperature sensor, internal temperature sensor, internal current from the current sensor, The overheat state and the overcurrent state of the high voltage battery may be checked based on external temperature sensing information and current sensing information.

In the first step, the high-voltage battery is installed in the lower part of the trunk room, the weight sensor is installed on the lower bottom surface of the trunk room, the hybrid control unit is the weight of the load cargo in the trunk of the weight sensor And detecting the damage state of the high voltage battery due to the overload of the trunk according to the detection.

In the second step, the hybrid control unit displays a warning message warning the occurrence of any one of the risk factors detected from the internal hazards of the vehicle, the external hazards, and the direct hazards of the high voltage battery through the display unit. It characterized in that it further comprises.

The third step may further include the step of allowing the hybrid control unit to transmit a motor driving stop command to the motor control unit (MCU) to stop driving of the motor unit in which power supply is cut off.

According to the present invention made as described above, in a hybrid vehicle equipped with a high voltage battery, it is possible to comprehensively detect various dangerous factors generated in a dangerous situation directly occurring in the high voltage battery or various electrical appliances, mechanical parts, etc. of the vehicle, According to the detection status of the element, the blocking operation to prevent damage to the high voltage battery can be performed, so that even if a direct or indirect risk situation of the high voltage battery occurs, By preferentially blocking, the driving safety and reliability of the hybrid vehicle can be improved.

1 is a view showing the overall configuration of a control system for implementing a high voltage battery protection method of a hybrid vehicle according to an embodiment of the present invention.
2 is a view schematically showing an installation state of a high voltage battery for executing the high voltage battery protection method of a hybrid vehicle according to an embodiment of the present invention.
3 is a flowchart illustrating an operation of a method for protecting a high voltage battery of a hybrid vehicle according to an exemplary embodiment of the present invention.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a view showing the overall configuration of a control system for implementing a high voltage battery protection method of a hybrid vehicle according to an embodiment of the present invention.

As shown in FIG. 1, a control system for implementing a high voltage battery protection method of a hybrid vehicle according to the present invention includes a high voltage battery 10, a safety plug 20, a weight sensor 22, and a battery management system ( A battery management system (BMS) 30, a motor control unit (MCU) 32, a motor unit 34, an engine unit 40, an engine control unit (ECU) 42, Continuously Variable Transmission (CVT) 50, Transmission Control Unit (TCU) 52, Hybrid Control Unit (HCU) 60, Display 62, Memory 64, CAN communication interface 100.

The high voltage battery 10 has a combination configuration of a plurality of battery packs mounted in a trunk room of a vehicle, and supplies a high voltage DC voltage for driving a motor for driving the vehicle.

Here, two sets of module temperature sensors 12 and 14 are installed inside the high voltage battery 10 and a heat sensing element such as a negative characteristic dummy element (NTC) element is installed on the top of the battery. Two sets of outside air temperature sensors 16 and 18 are fixedly installed.

The safety plug 20 is connected between the power supply terminals of the high voltage battery 10 and cuts off an internal fuse by receiving a cutoff control according to a risk factor generated by the battery management system 30. Ensure that battery power is off.

The weight sensor 22 detects the weight of the cargo loaded in the trunk room in which the high voltage battery 10 is installed, and generates a weight detection signal accordingly.

The battery management system 30 monitors battery related information such as power charging / supply control of the high voltage battery 10 and current, voltage, temperature, and usage time for performance maintenance of the battery in a normal state. The battery energy state information calculated according to the battery management control and monitoring result is transmitted to the hybrid control unit 60 and the engine control unit 42 through the CAN communication of the CAN communication interface 100.

Meanwhile, the battery management system 30 performs CAN communication using the CAN communication interface 100 in a dangerous situation that is directly generated in the high voltage battery 10 or in an abnormal state where a dangerous situation is generated by an indirect effect. The battery control command is received from the hybrid control unit 60 through the danger detection to operate the safety plug 20 to cut off the supply of battery power.

The motor control unit 32 performs control to cause the motor unit 34 to be driven by receiving a normal high voltage power from the high voltage battery 10 according to comprehensive vehicle driving control of the hybrid control unit 60. .

On the other hand, when the motor control unit 32 receives a motor driving stop command from the hybrid control unit 60 due to an emergency state in which a danger occurs to the vehicle, the motor unit 34 of the high voltage battery 10 Control the motor to stop synchronously with the power supply cutoff.

In addition, the motor control unit 32 receives a current sensing signal from a current sensor (not shown) installed at a power output end of the high voltage battery 10 to detect whether an overcurrent occurs, and when an overcurrent is detected, The hybrid control unit 60 is notified of the overcurrent occurrence state of the battery.

The engine control unit 42 causes the motor unit 34 to be motor driven by the motor control unit 32 according to the vehicle starting control from the hybrid control unit 60 to start the hybrid control unit. According to the overall vehicle running control from the unit 60, the engine unit 40 is supplied with gasoline fuel to perform engine control to operate normally.

The transmission control unit 52 is responsible for the control of the normal shift operation of the transmission 50 in accordance with the overall vehicle running control of the hybrid control unit 60.

The hybrid control unit 60 is for comprehensively controlling the vehicle by receiving various information necessary for driving control of the hybrid vehicle, and each of the inside and outside of the vehicle through CAN communication using the CAN communication interface 100. In addition to receiving sensing information from various types of installed electronic devices and various types of sensor devices for detecting operation information of various mechanical parts, the diagnostic codes from the engine control unit 42 and the motor control unit 32 are received. Two sets of module temperature sensors 12 and 14, two sets of internal temperature sensors 16 and 18 and a weight sensor 22 which are provided with information to determine a dangerous state of the vehicle and detect the state of the high voltage battery 10. The internal and external temperature detection signals and the weight detection signals are applied to determine whether the battery is dangerous.

The hybrid control unit 60 determines an external dangerous state or an internal dangerous state of the vehicle, or determines whether the high voltage or heavy weight of the high voltage battery 10 is damaged or whether an overcurrent occurs. 30, a battery shutdown command is transmitted, and a motor stop command of the motor is transmitted to the motor control unit 32, while a warning message indicating a corresponding dangerous situation is displayed on the display unit 62.

Here, the internal dangerous state collected from the various sensor devices inside the vehicle may include an engine overheating, an overheating and a short state of electric wires and electrical components of the electronic device, and an external dangerous state collected from various sensor devices outside the vehicle. Module, a collision accident state by image recognition that can be performed using a black box, and a fire accident detected using an outside temperature sensor.

The display unit 62 displays a warning message for visually notifying a dangerous situation occurring inside or outside the vehicle or a dangerous situation occurring in the high voltage battery 10 according to display control of the hybrid control unit 60. do.

The memory 64 may include setting value data and parameter values for determining various dangerous situations generated inside and outside the vehicle, and setting value data and parameter values for determining a dangerous situation that may occur in the high voltage battery 10. The warning message data for each dangerous situation is stored.

Next, FIG. 2 is a diagram schematically illustrating an installation state of a high voltage battery for executing a high voltage battery protection method of a hybrid vehicle according to an exemplary embodiment of the present invention.

As shown in FIG. 2, the high voltage battery 10 is fixedly installed in the interior of the trunk, but is installed in the lower portion of the trunk room 70 having a trunk space capable of substantially loading cargo.

In the lower part of the trunk room 70, the weight sensor 22 senses the bottom surface of the lower part of the trunk room 70 in order to measure the weight of the load cargo applied to the lower space of the trunk room 70 as a whole. Ensure that the parts are evenly installed.

In addition, between the trunk room 70 and the installation portion of the high voltage battery 10, an impact due to a load applied by the weight of the cargo loaded in the trunk room 70 is applied to the high voltage battery 10. The shock absorbing member 80 is buffered according to the shape deformation function in the middle so as not to be transmitted.

Next, the operation of the high voltage battery protection method of the vehicle according to the embodiment of the present invention made as described above will be described in detail with reference to the flowchart of FIG. 3.

3 is a flowchart illustrating an operation of a method for protecting a high voltage battery of a hybrid vehicle according to an exemplary embodiment of the present invention.

First, in a state in which the hybrid vehicle is running (S10), the hybrid control unit 60 is a sensor device for detecting the presence or absence of various electrical equipment and mechanical parts of the inside and outside of the vehicle, the engine control unit 42 and The module temperature sensors 12 and 14 and the outside temperature sensors 16 and 18 which check risk factors of the vehicle itself by the diagnostic code values from the motor control unit 32 and detect abnormalities of the high voltage battery 10. The risk signal of the battery is checked by receiving the detection signal from the weight sensor 22 (S11).

The hybrid control unit 60 determines whether a dangerous situation has occurred inside the vehicle as a result of checking the inside, the outside of the vehicle, and the high voltage battery 10 (S12).

As a result of the determination, when it is determined that a dangerous situation has occurred inside the vehicle, a warning message of the corresponding internal dangerous situation is displayed on the display unit 62 based on the dangerous situation warning message data from the memory 64. (S13).

In addition, the hybrid control unit 60 determines whether a dangerous situation has occurred outside the vehicle, as a result of checking the inside, the outside of the vehicle, and the high voltage battery 10 (S14).

As a result of the determination, if it is determined that a dangerous situation has occurred outside of the vehicle, the warning message of the corresponding external dangerous situation is displayed on the display unit 62 based on the dangerous situation warning message data from the memory 64. (S15).

On the other hand, the hybrid control unit 60 determines whether overcurrent occurs from the high voltage battery 10 as a result of analyzing the diagnostic codes from the engine control unit 42 and the motor control unit 32 (S16). ).

As a result of the determination, when it is determined that an overcurrent has occurred from the high voltage battery 10, a warning message of battery overcurrent is displayed on the display unit 62 based on the dangerous situation warning message data from the memory 64 ( S17).

In addition, the hybrid control unit 60 is connected to two sets of module temperature sensors 12 and 14 installed inside and outside the high voltage battery 10, and two sets of external air temperature sensors 16 and 18 to control the temperature sensing results. Accordingly, it is determined whether the high voltage battery 10 is in an overheating state equivalent to a set value corresponding to a dangerous state (S18).

As a result of the determination, when it is determined that the high voltage battery 10 is in an overheat state corresponding to a dangerous state, a warning message of battery overheating on the display unit 62 is based on the dangerous situation warning message data from the memory 64. Is displayed (S19).

In addition, the hybrid control unit 60 is overloaded with cargo loaded in the trunk room 70 by the weight detection signal detected from the weight sensor 22 installed on the bottom bottom surface of the trunk room (70). Determine the recognition (S20).

As a result of the determination, when it is determined that the load cargo in the trunk room 70 is overloaded, the trunk overload warning message is displayed on the display unit 62 based on the dangerous situation warning message data from the memory 64. (S21).

In this state, the hybrid control unit 60 compares the overweight value based on the set point data of the memory 64 so that the high voltage battery 10 installed in the lower portion of the trunk room 70 may be damaged. It is determined whether the dangerous state by the overweight (S22).

On the other hand, after the warning message for warning the respective dangerous conditions, such as the steps S13, S15, S17, S19 is displayed on the display unit 62, or as a result of the overload of the trunk as a result of the determination of S22 the high voltage battery ( If it is determined that the damage to the 10) is a dangerous state, the hybrid control unit 60 transmits a battery shutdown command to the battery control unit 30 (S23).

Accordingly, the battery control unit 30 automatically cuts off the fuse of the safety plug 20 connected to the power output end side of the high voltage battery 10 to cut off the power supply from the high voltage battery 10 ( S24).

In addition, the hybrid control unit 30 transmits a motor driving stop command to the motor control unit 32 together with the transmission of the battery cutoff command, so that the motor control unit 32 controls the motor unit 34. As a result of stopping the drive, the ignition of the vehicle is turned off so that the behavior is forcibly stopped.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

10: high voltage battery 20: safety plug
22: Weight sensor 30: Battery management system (BMS)
32: motor control unit (MCU) 34: motor unit
40: engine part 42: engine control unit (ECU)
50: Transmission (CVT) 52: Transmission Control Unit (TCU)
60: hybrid control unit (HCU) 62: display unit
64: memory 100: CAN communication interface

Claims (5)

A first step of the hybrid control unit (HCU) checking each of the vehicle's internal hazards, the external hazards and the direct hazards of the high voltage battery;
A second step of generating a power supply cutoff command of the high voltage battery when the hybrid control unit detects any one of an internal hazard, an external hazard, and a direct hazard of the high voltage battery of the vehicle; And
And receiving a power supply cutoff command from the hybrid control unit when a battery management system (BMS) receives a power cutoff command from the hybrid control unit. High voltage battery protection method of a hybrid vehicle, characterized in that. The method of claim 1,
In the first step, the hybrid control unit includes at least one electronic device installed inside and outside the vehicle, sensing information received from at least one sensor device for sensing operation information of a mechanical part, and an engine control unit (Engine Check the vehicle's internal and external hazards based on diagnostic code information from the Control Unit (ECU) and the Motor Control Unit (MCU),
Hybrid vehicle, characterized in that for checking the overheat state and overcurrent state of the high voltage battery based on the external module temperature sensor and the internal temperature sensor installed in the high voltage battery, internal and external temperature sensing information, current sensing information from the current sensor How to protect your high voltage battery. The method of claim 1,
In the first step, while the high voltage battery is installed in the lower part of the trunk room, the weight sensor is installed on the lower bottom surface of the trunk room,
The hybrid control unit further comprises the step of checking the damage state of the high-voltage battery due to the overload of the trunk in accordance with the detection of the weight of the cargo loaded in the trunk of the weight sensor. The method of claim 1,
In the second step, the hybrid control unit displays a warning message warning the occurrence of any one of the risk factors detected from the internal hazards of the vehicle, the external hazards, and the direct hazards of the high voltage battery through the display unit. High voltage battery protection method of a hybrid vehicle, characterized in that it further comprises. The method of claim 1,
The third step may further include a step in which the hybrid control unit transmits a motor driving stop command to a motor control unit (MCU) to stop driving of the motor unit in which power supply is cut off. Protection method.

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