KR20220001547A - Notification method and apparatus for providing distance to empty of vehicle - Google Patents

Abstract

The present invention relates to a method and apparatus for providing a travelable distance of a vehicle, capable of providing information about a travelable distance and time for which a vehicle actually can travel until the vehicle is turned off due to the discharge of a battery when the battery cannot be charged due to the malfunction of an alternator while the vehicle is being driven. Moreover, when the alternator of the vehicle is confirmed as malfunctioning, a travelable distance, which is a distance by which the vehicle can travel until the vehicle is turned off due to the discharge of the battery, as well as travelable time is calculated, and then, a notification message including information about the malfunctioning state of the alternator and information about the travelable distance and time is displayed through a cluster, thereby preventing a driver from misunderstanding that the battery can be charged while driving the vehicle, and leading the driver to become aware of a situation, in which the vehicle can be turned off while being driven, and also, leading the driver to park the vehicle in a safe area within the travelable distance and time.

Description

Method and apparatus for notifying a vehicle's drivable distance

According to the present invention, when the battery cannot be charged due to a failure of the alternator while the vehicle is running, the vehicle's drivable distance provides information on the drivable distance and time that the vehicle can actually drive until the ignition is turned off due to discharging of the battery. It relates to a notification method and device.

In general, the alternator, one of the vehicle parts, performs a function of generating electric power while the vehicle is driving and charging the battery. By turning on the battery warning lamp of the cluster, only information on whether or not the battery is discharged is provided.

However, if the battery is not charged due to a failure of the alternator while the vehicle is running, the vehicle may be turned off as the battery continues to be discharged by loads in the vehicle. They could only check the information that the remaining battery power was low, but could not recognize that the vehicle could be turned off.

That is, since most drivers know that the battery is charged by driving the vehicle, even when the battery warning light is on, the driver misunderstands that the battery will be charged while the vehicle is being driven, and continues driving without stopping the vehicle and then on the road. There is a problem in that you are faced with a situation in which the ignition of the vehicle is suddenly turned off.

In this case, since the vehicle whose ignition is turned off cannot be restarted, road congestion may be caused by the corresponding vehicle, and a collision accident by a subsequent vehicle may occur.

The present invention has been devised in view of the above problems, and when a situation in which battery charging cannot be made due to a failure of the alternator while the vehicle is being driven occurs, information on whether the alternator has failed and the battery is discharged to the driver. An object of the present invention is to provide a vehicle drivable distance notification method and device capable of providing information on the actual drivable distance and time until the ignition is turned off.

In addition, in the present invention, when the battery cannot be charged due to a failure of the alternator while the vehicle is running, the vehicle driving capable of increasing the drivable distance of the vehicle by controlling the load mounted on the vehicle to reduce battery consumption. An object of the present invention is to provide a method and apparatus for notifying a possible distance.

Objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

The present invention for achieving the above object is (1) receiving the status information of the alternator to check whether the alternator is faulty, and the battery voltage at the time of alternator failure, which is the battery voltage at the time when the alternator is confirmed to be faulty, and the alternator. storing information on the failure confirmation time, which is the time at which the failure is confirmed; (2) calculating the drivable distance and drivable time, which are the distances the vehicle can travel, before the ignition of the vehicle is turned off due to battery discharge, using the stored battery voltage at the time of alternator failure; (3) when the drivable distance is less than or equal to the distance to the destination or the drivable time is less than or equal to a threshold, transmitting a control message to at least one cut-off load set among loads in the vehicle to control the cut-off load to be turned off; and (4) transmitting a notification message including at least one of information on the fault state of the alternator, drivable distance, and drivable time to the cluster, and displaying the notification message through the cluster. Distance notification method is provided.

In a preferred embodiment, in the step (2), the discharge time per unit voltage is calculated using the battery voltage at the time of the alternator failure, the failure confirmation time, and the current battery voltage, and the calculated discharge time per unit voltage Accordingly, the time for which the current battery voltage decreases to the lowest limit voltage is calculated as the drivable time, and the drivable distance is calculated by multiplying the calculated drivable time by the vehicle speed.

In a preferred embodiment, the step (2) calculates the drivable distance and drivable time using the following equation,

[formula]

OCV ₁ is the current battery voltage, ICU is the lowest limit voltage, RTC ₁ is the current time, RTC ₂ is the failure confirmation time, OCV ₂ is the battery voltage at the time of the alternator failure, and VS is the vehicle speed.

In a preferred embodiment, in the step (2), the lowest limit by adding a correction value according to the voltage drop for each load to the operating voltage of an Integrated Central Control Unit (ICU) that supplies power to the loads in the vehicle to operate The voltage is calculated, and the drivable time and drivable distance are calculated using the calculated lowest voltage limit and the battery voltage at the time of alternator failure.

In a preferred embodiment, the correction value according to the voltage drop for each load is set differently according to the type and number of the currently operated blocking load.

In addition, the present invention provides a computer program stored in a computer-readable storage medium to execute the drivable distance notification method in a computer.

In addition, the present invention is a processor; and a memory for storing one or more instructions executable by the processor, wherein the processor receives status information of the alternator by executing the one or more instructions, checks whether the alternator is faulty, and the alternator is faulty It stores the battery voltage at the time of alternator failure, which is the battery voltage at the time it is confirmed that the It calculates the drivable distance and drivable time, which are the distances the vehicle can travel, before the ignition is turned off. By sending a control message to the blocking load to control the blocking load to be turned off, and by sending a notification message including at least one of information on the fault state of the alternator, the drivable distance and the drivable time to the cluster, Provided is a drivable distance notification device that displays a notification message through

In a preferred embodiment, by executing the one or more instructions, the processor calculates a discharge time per unit voltage using the battery voltage at the time of the alternator failure, the failure confirmation time, and the current battery voltage, and the calculated unit voltage The time for which the current battery voltage decreases to the lowest limit voltage is calculated as the drivable time according to the required discharging time, and the drivable distance is calculated by multiplying the calculated drivable time by the vehicle speed.

In a preferred embodiment, the processor calculates the drivable distance and the drivable time using the following equation by executing the one or more instructions,

[formula]

OCV ₁ is the current battery voltage, ICU is the lowest limit voltage, RTC ₁ is the current time, RTC ₂ is the failure confirmation time, OCV ₂ is the battery voltage at the time of the alternator failure, and VS is the vehicle speed.

In a preferred embodiment, the processor, by executing the one or more instructions, a correction value according to the voltage drop for each load to the operating voltage of an integrated central control unit (ICU) that supplies power to the loads in the vehicle to operate The lowest limit voltage is calculated by adding

In a preferred embodiment, the correction value according to the voltage drop for each load is set differently according to the type and number of the currently operated blocking load.

According to the above-described problem solving means, the present invention calculates the drivable distance and the drivable time, which are the distances the vehicle can travel, before the ignition of the vehicle is turned off due to battery discharge when it is confirmed that the alternator of the traveling vehicle is malfunctioning, Prevents the driver from mistakenly thinking that the battery will be charged while the vehicle is being driven by displaying a notification message including information on the fault state of the alternator and information on the drivable distance and drivable time through the cluster. In addition, there is an effect of guiding the driver to stop the vehicle by moving to a safe area within the drivable distance and drivable time.

In addition, in the present invention, when the drivable distance is less than or equal to the distance to the destination or when the drivable time is less than or equal to a threshold, a control message is transmitted to the blocking loads in the vehicle to control the turn-off, thereby reducing power consumption by the blocking loads to reduce the vehicle It has the effect of increasing the drivable distance of

1 is a view for explaining a drivable distance notification device according to an embodiment of the present invention.
2 is a view for explaining a hardware configuration of a drivable distance notification device according to an embodiment of the present invention.
3 is a view for explaining a notification message displayed on a cluster by the drivable distance notification device according to an embodiment of the present invention;
4 is a view for explaining a method for notifying a drivable distance according to an embodiment of the present invention.

In the following description, specific details of the invention are set forth in order to provide a general understanding of the invention, but it is common knowledge in the art that the invention may be readily practiced without these specific details and with modifications thereof. It will be self-evident to those who have

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings 1 to 4, but mainly the parts necessary for understanding the operation and operation according to the present invention.

1 is a view for explaining a drivable distance notification device according to an embodiment of the present invention.

Referring to FIG. 1 , the drivable distance notification device 100 according to an embodiment of the present invention may be mounted on an integrated central control unit (ICU, 10) that supplies power to operate loads in a vehicle. and to be connected to the engine controller (Engine Management System, EMS, 20), the battery sensor (Intelligent battery sensor, IBS, 30), the cluster (Cluster, CLU, 40) and the controller 50 of the blocking loads in the vehicle through the vehicle network can

Here, the above-described engine controller 20 is connected to the alternator (ALT, 70) that generates electric power while the vehicle is driving and charges the batteries (Battery, BAT, 60), status information transmitted from the alternator (70) transmits to the drivable distance notification device 100, and the battery sensor (Intelligent battery sensor, IBS, 30) is connected to the battery 60 to measure the battery voltage and measure the information about the measured battery voltage and the battery voltage. Information on the measurement time may be transmitted to the drivable distance notification device 100 .

In addition, the cluster 40 may output and display a notification message transmitted from the drivable distance notification device 100 on the screen, and the controller 50 of the in-vehicle blocking loads is transmitted from the drivable distance notification device 100 . It is possible to turn off or turn on each blocking load according to a control message to be executed.

In addition, the blocking loads in the vehicle are preset among the loads in the vehicle, or are selected by measuring power consumption while the vehicle is driving, for example, heated seats, air conditioners, and AVN (Audio Video Navigation). may include

These blocking loads are loads that have a large amount of load, but do not directly affect the driving performance or safety of the vehicle. It may further include various loads installed in the vehicle for the convenience of the driver or other uses.

Hereinafter, a hardware configuration of the drivable distance notification apparatus 100 according to an embodiment of the present invention will be described.

2 is a diagram for explaining a hardware configuration of a drivable distance notification device according to an embodiment of the present invention, and FIG. 3 is a notification message displayed on a cluster by the drivable distance notification device according to an embodiment of the present invention. It is a drawing for explaining.

2 and 3 , the drivable distance notification apparatus 100 according to an embodiment of the present invention may include a communication unit 110 , a memory 120 , and a processor 130 .

The communication unit 110 communicates with the engine controller 20 mounted on the vehicle, the battery sensor 30 , the cluster 40 , and the controller 50 of blocking loads in the vehicle using the vehicle network. In this case, the vehicle network used by the communication unit 110 may include a controller area network (CAN), a local interconnect network (LIN), FlexRay, and vehicle Ethernet.

The communication unit 110 receives status information of the alternator 70 from the engine controller 20 , receives information about the battery voltage and its measurement time from the battery sensor 30 , and a notification message to the cluster 40 . and transmits a control message to the controller 50 of blocking loads in the vehicle.

The memory 120 may store various data, commands, and information, and in particular, may store programs (one or more instructions) for processing and controlling the processor 130 , and in addition, input by the processor 130 . Alternatively, output data may be stored.

In the memory 120, information on the battery voltage at the time of alternator failure, which is the battery voltage at the time when the alternator 70 is confirmed to be defective, and information on the failure confirmation time, which is the time when the failure of the alternator 70 is confirmed And, information on the cut-off loads and information on the correction value according to the voltage drop for each load may be further stored.

The processor 130 may include one or more, execute one or more instructions or programs stored in the memory 120 , and may control the overall operation of the drivable distance notification apparatus 100 .

In addition, the processor 130 is configured as a central processing unit (CPU), a micro processor unit (MPU), a micro controller unit (MCU), an electronic control unit (ECU), or any type of processor well known in the art. can be

The processor 130 uses the state information of the alternator 70 received from the communication unit 110 to check whether the alternator 70 is faulty, and at the time when the alternator 70 is confirmed to be faulty, the communication unit 110 ) may be stored in the memory 120 as information about the battery voltage and the measurement time for measuring the battery voltage, as information about the battery voltage at the time of the alternator failure and the failure confirmation time.

In addition, the processor 130 can calculate the drivable distance and the drivable time, which are the distances the vehicle can travel, before the ignition of the vehicle is turned off due to battery discharge, using the battery voltage at the time of the alternator failure stored in the memory 120 . have.

Specifically, the processor 130 calculates the discharge time per unit voltage using the battery voltage and the failure confirmation time at the time of the alternator failure, and the current battery voltage and the current time, and calculates the discharge time per unit voltage at the calculated discharge time per unit voltage. Accordingly, the time for which the current battery voltage decreases to the lowest limit voltage may be calculated as the drivable time.

Actually, the processor 130 may calculate the drivable distance and the drivable time using Equation 1 below.

[Formula 1]

where OCV ₁ is the current battery voltage, ICU is the lowest limit voltage, RTC ₁ is the current time, RTC ₂ is the failure confirmation time, OCV ₂ is the battery voltage at the time of the alternator failure, and VS is the vehicle speed .

In addition, the lowest limit voltage may be calculated by adding a correction value according to the voltage drop for each load to the operating voltage of the integrated control unit 10 .

For reference, as the battery 60 of the vehicle cannot be charged due to a failure of the alternator 70 and continues to be discharged, when the battery voltage is lowered below the operating voltage of the integrated control unit 10, a situation in which the vehicle's engine is suddenly turned off may occur. Also, even if the battery voltage is not lower than the operating voltage of the integrated control unit 10, if an instantaneous voltage drop occurs, the battery voltage is momentarily lower than the operating voltage of the integrated control unit 10, so that the vehicle can be started. Therefore, the drivable time and drivable distance are calculated using the lowest limit voltage in which the correction value according to the voltage drop for each load is reflected.

At this time, the above-described correction value according to the voltage drop for each load may be set differently depending on the type and number of blocking loads currently operating, and the correction value according to the voltage drop for each load of the blocking load including the heated seat, air conditioner, and AVN is set to 0.706V when only the air conditioner is operating, is set to 1.217V when only the heated seat is operating, is set to 0.371V when only the AVN is operating, and is set to 1.796V when the air conditioner and the heated seat are operating together It is set to 0.859V when the air conditioner and AVN are operating together, and can be set to 1.878V when the heated seat, air conditioner, and AVN are all operating.

The correction value according to the voltage drop for each load may be set in advance as a value obtained by measuring the voltage drop occurring while each load is operating, and the value of the voltage drop measured in real time while the vehicle is driving is stored in the memory. It can also be set in a way that the correction value according to the voltage drop for each load is stored in 120 and updated in real time.

On the other hand, when the calculation of the drivable time is completed, the processor 130 may calculate the drivable distance by multiplying the calculated drivable time by the speed of the vehicle. In this case, the information on the vehicle speed may be received from the ECU (Electronic Control Unit) or the cluster 40 in the vehicle through the communication unit 110 .

Then, when the drivable distance is less than or equal to the distance to the destination or the drivable time is less than or equal to a threshold, the processor 130 transmits a control message to at least one cut-off load set among loads in the vehicle so that the cut-off load is turned off. control

In this case, the processor 130 may control to be sequentially turned off from the blocking load having the largest power consumption among the blocking loads, and the power consumption of each blocking load is registered in advance or the consumption of each blocking load while the vehicle is driving It may be set to a value learned by monitoring the power.

Under the control of the processor 130 , it is possible to reduce power consumption by cut-off loads, and as a result, it is possible to increase the drivable distance of the vehicle by delaying the discharge of the battery of the vehicle.

In addition, the processor 130 transmits to the cluster 40 a notification message including at least one of information on the failure state of the alternator 70 , the drivable distance and the drivable time to the cluster 40 , thereby providing a notification message through the cluster 40 . is displayed so that the driver can check it.

For example, as shown in FIG. 3 , the notification message displayed on the cluster 40 by the drivable distance notification device 100 indicates a failure state of the alternator 70 ( 301 ), and the drivable time and the drivable distance are displayed (302, 303), and while displaying a list of cutoff loads controlled to be turned off by the processor 130 (304), a guide phrase 305 indicating that the vehicle should be moved to a safe area It can be implemented to display.

Through such a notification message, the driver can recognize that the vehicle's ignition may be suddenly turned off, and can move to an appropriate safe area while checking the drivable distance or drivable time displayed as a notification message.

As described above, the present invention can be implemented by the processor 130 executing at least one executable instruction or at least one executable program stored in the memory 120, and can be driven according to an embodiment of the present invention to be described later. Similarly, the distance notification method may be implemented by the processor 130 executing at least one executable instruction or at least one executable program stored in the memory 120 .

4 is a view for explaining a method for notifying a drivable distance according to an embodiment of the present invention.

Referring to FIG. 4 , the processor 130 checks whether the alternator 70 has failed and stores the checked information on the alternator 70 in the memory 120 ( S100 ).

At this time, the processor 130 may check whether the alternator 70 has failed from the state information of the alternator 70 transmitted from the engine controller 20 , and information about the battery voltage transmitted from the battery sensor 30 and the battery Information on the measurement time for measuring the voltage may be stored in the memory 120 as information on the battery voltage at the time of the alternator failure and the failure confirmation time.

Here, the engine controller 20 may be connected to the alternator 70 that charges the battery 60 , and may receive status information transmitted from the alternator 70 and transmit it to the drivable distance notification device 100 . As another example, the drivable distance notification device 100 according to an embodiment of the present invention receives status information directly from the alternator 70 without going through a separate engine controller 20 , or receives status information other than the engine controller 20 . It may be implemented in the form of receiving status information of the alternator 70 through a component having a communication function.

In addition, the battery voltage at the time of alternator failure stored in the memory 120 by the processor 130 is the battery voltage at the time when the alternator 70 is confirmed to be defective. For example, the alternator 70 is assumed to be defective. It may be the battery voltage transmitted from the battery sensor 30 at the time of confirmation, and the failure confirmation time stored in the memory 120 by the processor 130 is the time when the failure of the alternator 70 is confirmed, yes For example, it may be a measurement time in which the battery voltage transmitted from the battery sensor 30 is measured at a time when the alternator 70 is confirmed to be malfunctioning.

Then, the processor 130 calculates the drivable distance and the drivable time, which are the distances the vehicle can travel, before the ignition of the vehicle is turned off due to battery discharge, using the battery voltage stored in the memory 120 at the time of the alternator failure. (S200).

Specifically, the processor 130 calculates the discharge time per unit voltage using the battery voltage at the time of the alternator failure, the failure confirmation time, and the current battery voltage, and the current battery voltage according to the calculated discharge time per unit voltage. The time to decrease to the lowest limit voltage is calculated as the drivable time. In addition, the processor 130 may calculate the drivable distance by multiplying the calculated drivable time by the speed of the vehicle.

In addition, the processor 130 may calculate the drivable distance and the drivable time using Equation 2 below.

[Equation 2]

where OCV ₁ is the current battery voltage, ICU is the lowest limit voltage, RTC ₁ is the current time, RTC ₂ is the failure confirmation time, OCV ₂ is the battery voltage at the time of the alternator failure, and VS is the vehicle speed . Meanwhile, the above-described lowest limit voltage may be calculated by adding a correction value according to a voltage drop for each load to the operating voltage of the integrated control unit 10 .

In addition, the correction value according to the voltage drop for each load may be set differently depending on the type and number of blocking loads currently operating. Compensation value according to this is set to 0.706V when only the air conditioner is operating, set to 1.217V when only the heated seat is operating, is set to 0.371V when only the AVN is operating, and 1.796 when the air conditioner and the heated seat are operating together It is set to V, and may be set to 0.859V when the air conditioner and AVN are operating together, and may be set to 1.878V if the heated seat, air conditioner, and AVN are all operating.

Then, when the drivable distance is less than or equal to the distance to the destination or the drivable time is less than or equal to the threshold, the processor 130 transmits a control message to the controller 50 of at least one blocking load set among the loads in the vehicle. Control to turn off the blocking load (S300).

In this case, the processor 130 may control to turn off sequentially from the blocking load having the largest power consumption among the blocking loads.

Then, the processor 130 transmits to the cluster 40 a notification message including at least one of information on the fault state of the alternator 70, the drivable distance, and the drivable time to the cluster 40, and through the cluster 40 A notification message is displayed so that the driver can check (S400).

Through this notification message, the driver recognizes that the vehicle's engine may be suddenly turned off, and moves to an appropriate safe area while checking the drivable distance or drivable time.

On the other hand, when the above-described 400th step is completed, the 200th step is performed again to update the drivable distance and the drivable time, and thereafter, the 300th step is performed again to further turn off the blocking load, and the Thereafter, the process of displaying the updated drivable distance and drivable time on the cluster 40 while performing step 400 again may be repeated.

The steps of a method or algorithm described in relation to an embodiment of the present invention may be implemented directly in hardware, as a software module executed by hardware, or by a combination thereof.

A software module may include random access memory (RAM), read only memory (ROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, hard disk, removable disk, CD-ROM, or The present invention may reside in any form of computer-readable storage medium well known in the art.

The components of the present invention may be implemented as a computer program (or application) to be executed in combination with a computer, which is hardware, and stored in a computer-readable storage medium. Components of the present invention may be implemented as software programming or software components, and similarly, embodiments may include various algorithms implemented as data structures, processes, routines, or combinations of other programming constructs, including C, C++ , may be implemented in a programming or scripting language such as Java, assembler, or the like. Functional aspects may be implemented in an algorithm running on one or more processors.

In the above, preferred embodiments of the present invention have been exemplarily described, but the scope of the present invention is not limited to such specific embodiments, and can be appropriately changed within the scope described in the claims.

100: drivable distance notification device
110: communication department
120: memory
130: processor

Claims (11)

(1) Receive the alternator status information, check whether the alternator is faulty, and check the battery voltage at the time the alternator is faulty, the battery voltage at the time the alternator is faulty, and the fault check time, the time when the faulty alternator is confirmed. storing information about;
(2) calculating the drivable distance and the drivable time, which are the distances the vehicle can travel, by using the stored battery voltage at the time of the failure of the alternator until the ignition of the vehicle is turned off due to battery discharge;
(3) when the drivable distance is less than or equal to the distance to the destination or the drivable time is less than or equal to a threshold, transmitting a control message to at least one cut-off load set among loads in the vehicle to control the cut-off load to be turned off; and
(4) transmitting a notification message including at least one of information on the fault state of the alternator, drivable distance, and drivable time to the cluster, and displaying the notification message through the cluster; Notification method.
The method of claim 1,
The (2) step is,
Using the battery voltage at the time of alternator failure, the failure confirmation time, and the current battery voltage, the time required for discharging per unit voltage is calculated, and the time for the current battery voltage to decrease to the lowest limit voltage according to the calculated discharging time per unit voltage. is calculated as the drivable time, and the drivable distance is calculated by multiplying the calculated drivable time by the vehicle speed.
The method of claim 1,
The step (2) calculates the drivable distance and drivable time using the following formula,
[formula]

OCV ₁ is the current battery voltage, ICU is the lowest limit voltage, RTC ₁ is the current time, RTC ₂ is the failure confirmation time, OCV ₂ is the battery voltage at the time of the alternator failure, and VS is the speed of the vehicle. Available distance notification method.
The method of claim 1,
The (2) step is,
The lowest limit voltage is calculated by adding the correction value according to the voltage drop for each load to the operating voltage of the Integrated Central Control Unit (ICU) that supplies power to the loads in the vehicle to operate, and the calculated lowest voltage and the time of alternator failure A drivable distance notification method that calculates the drivable time and drivable distance using the battery voltage of
5. The method of claim 4,
The correction value according to the voltage drop for each load,
A drivable distance notification method that is set differently depending on the type and number of cut-off loads currently operating.
A computer program stored in a computer-readable storage medium to execute, in a computer, the drivable distance notification method of any one of claims 1 to 5.
processor; and
Including; a memory for storing one or more instructions executable by the processor;
The processor, by executing the one or more instructions,
Receives the status information of the alternator to check whether the alternator is faulty, and the battery voltage at the time the alternator is faulty, which is the battery voltage at the time the alternator is confirmed to be faulty, and information about the fault confirmation time, which is the time when the fault of the alternator is confirmed. save,
Using the stored battery voltage at the time of alternator failure, calculates the drivable distance and drivable time, which are the distances the vehicle can travel before the ignition is turned off due to battery discharge
When the drivable distance is less than the distance to the destination or the drivable time is less than or equal to a threshold, a control message is transmitted to at least one cut-off load set among loads in the vehicle to control the cut-off load to be turned off,
A drivable distance notification device configured to transmit a notification message including at least one of information on an alternator failure state, drivable distance and drivable time to the cluster to display the notification message through the cluster.
8. The method of claim 7,
The processor, by executing the one or more instructions,
Using the battery voltage at the time of alternator failure, the failure confirmation time, and the current battery voltage, the time required for discharging per unit voltage is calculated, and the time for the current battery voltage to decrease to the lowest limit voltage according to the calculated discharging time per unit voltage. A drivable distance notification device, which calculates the drivable time as the drivable time, and calculates the drivable distance by multiplying the calculated drivable time by the speed of the vehicle.
8. The method of claim 7,
The processor, by executing the one or more instructions,
Calculate the drivable distance and drivable time using the formula below,
[formula]

OCV ₁ is the current battery voltage, ICU is the lowest limit voltage, RTC ₁ is the current time, RTC ₂ is the failure confirmation time, OCV ₂ is the battery voltage at the time of the alternator failure, and VS is the speed of the vehicle. Available distance notification device.
8. The method of claim 7,
The processor, by executing the one or more instructions,
The lowest limit voltage is calculated by adding the correction value according to the voltage drop for each load to the operating voltage of the Integrated Central Control Unit (ICU) that supplies power to the loads in the vehicle to operate, and the calculated lowest voltage and the time of alternator failure A drivable distance notification device that calculates the drivable time and drivable distance using the battery voltage of
11. The method of claim 10,
The correction value according to the voltage drop for each load,
A drivable distance notification device that is set differently according to the type and number of cutoff loads currently operating.

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