KR20080107756A - Method for operating an auxillary heater full auto temperature control for a vechicle - Google Patents

Abstract

An auxiliary heater driving method for a vehicle FATC is provided to control the driving flexibly by monitoring a battery voltage in winter. Winter season for driving an auxiliary heater is checked by the atmospheric temperature sensor of a vehicle(S10,S20). In winter, the auxiliary heater is driven according to driving speed calculated from a driving distance and speed of the vehicle(S30). The driving of the auxiliary heater is limited and a warning single is output if short distance driving generates frequently and if a batter voltage is lower than a threshold valve(S41-S45,S51-S55,S71).

Description

Method for Operating an Auxillary Heater Full Auto Temperature Control for a Vechicle

1 is a block diagram schematically showing the driving of an auxiliary heater of a vehicle FATC according to the present invention.

2 is a block diagram schematically illustrating driving of an auxiliary heater of a vehicle FATC and an engine control unit according to the present invention;

3 is a flowchart schematically illustrating a method of driving an auxiliary heater of a vehicle FATC according to the present invention;

4 is a flowchart schematically illustrating a driving method for power saving when driving an auxiliary heater of a vehicle FATC according to the present invention;

FIG. 5 is a flowchart schematically illustrating a driving method of controlling an auxiliary heater for a vehicle according to an exemplary embodiment of the present invention with a battery discharge amount according to time; FIG.

        <Brief description of reference numerals for the main parts of the drawings>

1: Automotive FATC System 11: Air Temperature Sensor

13: outside temperature sensor 15: vehicle speed sensor

20: FATC 30: engine control unit

40: auxiliary heater 50: CAN

The present invention relates to a method of driving an auxiliary heater of a vehicle FATC, and more particularly, in driving an auxiliary heater in winter, the battery voltage can be monitored and flexibly controlled, and frequent occurrence of short-distance driving that easily causes battery discharge. In consideration of the variable of, it can be divided into a long period and a short period during which the battery can be charged, and accordingly, the auxiliary heater can be controlled, and the auxiliary heater can be controlled in combination with the engine control disable condition. Although the heater is driven, the present invention relates to a method of driving an auxiliary heater of a vehicle FATC capable of controlling the auxiliary heater in a fluid manner by controlling the PWM type periodically on / off to minimize the discharge amount.

In general, FATC is equipped with a sensor that can detect various temperatures, insolation, cooling water, etc. according to the temperature set by the user, the user can automatically adjust the temperature inside the vehicle to match the desired temperature by the sensor detection value Is done.

Here, when the heater is driven without sufficient heating of the engine in a state where the external temperature of the vehicle is drastically lowered in winter, cold wind may be blown to the user.

Thus, an electric auxiliary heater (Electric Auxillary Heater) is provided, which is configured to drive by receiving the auxiliary heater request signal of the FATC from the engine control (Engine Control).

However, if the auxiliary heater is driven when the battery voltage exceeds the lower limit of an appropriate range for driving the auxiliary heater, the battery discharge amount may be high, which may hinder the driving of the vehicle, and the detection values for driving the auxiliary heater may be reduced. Since it passes through, a time delay may occur according to this, and such a problem may occur even when driving through the engine control unit.

The present invention has been made in order to solve the above problems, in driving the auxiliary heater in winter, the battery voltage can be monitored and fluidly controlled, taking into account the variable of frequent occurrence of short-distance driving easily occurs battery discharge This can be divided into a long period of time where the battery can be charged and a short period of time, which can be controlled, and the auxiliary heater can be controlled accordingly, and the auxiliary heater can be controlled in combination with the disable condition of the engine control unit. It is an object of the present invention to provide an auxiliary heater driving method of a vehicle FATC capable of controlling an auxiliary heater in a fluid manner by controlling the PWM type periodically on / off to minimize the discharge amount.

In order to achieve the above object, the present invention includes a first step of determining whether the winter driving the auxiliary heater from the inside, outside air temperature sensor of the vehicle; In winter, the auxiliary heater is driven, but the driving time is calculated by the driving distance and speed of the vehicle, and when the short-range driving occurs frequently, and when the battery voltage is lower than the threshold value, the driving of the auxiliary heater is restricted and a warning signal is output. Outputting a second step; It includes.

The second step is characterized in that the battery voltage threshold when the short-range driving occurs frequently for a short period is lower than the battery voltage threshold when the short-range driving occurs frequently during the long distance.

In this case, the auxiliary heater is provided as an electric auxiliary heater may be driven by a signal of the FATC or may be driven by a combination of the signal of the FATC and the signal of the engine control unit.

In addition, the second step may be characterized in that the signal to limit the driving of the electric auxiliary heater in the FATC to the electric auxiliary heater to limit the driving and output a warning signal in the electric auxiliary heater.

In addition, in the second step, the engine control unit receives a signal for limiting the driving of the electric auxiliary heater and combines the conditions for deactivating the operation of the electric auxiliary heater to limit the driving of the electric auxiliary heater and output a warning signal. It is characterized by.

In the second step, when the auxiliary heater is driven, the external air mode is switched to an internal air mode in which external air is introduced and blown into the vehicle, and circulated to the internal air of the vehicle, and the battery voltage is received to receive a specific voltage. If less, it characterized in that the auxiliary heater is controlled through the PWM type periodic on / off.

At this time, when the battery voltage is restored to the threshold value or more than the specific voltage, it characterized in that for driving the auxiliary heater.

In addition, the sensed value of the internal, external air temperature sensor, the vehicle speed signal, and the battery voltage signal is connected to the CAN system, characterized in that the transmission and reception to the FATC and the engine control unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing the driving of an auxiliary heater of a vehicle FATC according to the present invention. As shown in the figure, the vehicle FATC system 1 according to the present invention includes an air temperature sensor 11, an outside air temperature sensor 13, a vehicle speed sensor 15, a FATC 20, an auxiliary heater 40, and a CAN. 50 is made.

Here, the vehicle FATC system 1 is provided to receive sensing values of various sensors as input signals according to a temperature set by a user, and adjust the temperature automatically based on the input signal.

In addition, among the various sensor inputs of the vehicle FATC system 1, an internal air sensor 11 installed inside the vehicle bumper and an internal air temperature sensor for sensing the temperature inside the vehicle to detect the outside air temperature of the vehicle. The temperature sensor (Incar Sensor, 13) to check whether the winter is necessary to drive the auxiliary heater (40).

At this time, when the FATC 20 is driven while the engine is not sufficiently heated in winter, the air quality that is not sufficiently heated in the air conditioning apparatus (not shown) of the FATC 20 may be impaired the emotional quality. Therefore, the auxiliary heater 40 is provided to eliminate such a phenomenon.

In addition, the auxiliary heater (Auxillary Heater 40) is preferably provided as an electric auxiliary heater (Electric Auxillary Heater), in the present invention is operated by the auxiliary heater request signal output from the FATC (20).

In addition, the battery voltage signal of the vehicle is transmitted through the CAN 50. When the battery voltage is not within the normal range, the auxiliary heater 40 is controlled to be not driven or limited, or to the PWM type periodic on / off. Can be controlled.

To this end, it should be possible to monitor the voltage of the battery and determine whether or not it is within a normal range in which the auxiliary heater can be driven.

The battery voltage signal is transmitted from the general port of the microcomputer to the CAN 50 connected to the FATC 20, the vehicle speed sensor 15 receives the vehicle speed detection value, and the travel distance is transmitted through the CAN 50.

In addition, the driving time (traveling time = traveling distance / vehicle speed) may be calculated based on the vehicle speed received from the vehicle speed sensor 15 and the traveling distance received from the CAN 50. Check for frequent occurrences.

That is, when the short-range driving occurs frequently, in the case of the rechargeable vehicle battery, the discharge rate is increased, and thus the battery cannot be within a range in which the battery can operate normally. Thus, the voltage of the battery is monitored to monitor the auxiliary heater 40. ) To determine whether to drive.

Here, the normal range of the voltage of the battery is divided into a case of short-term and a long-term case, because the reason is that if a short distance is frequently driven within a short period, there is no time for the battery to be charged, and the driving range of the battery voltage is lowered. This is because, if the short-distance driving is frequently performed within a long period of time, the time for charging the battery is relatively larger than that of the short-term, so that the driving range of the battery voltage is increased.

Therefore, in the FATC 20, the short distance travel frequently occurs within a short period of time (CASE 1) and the short distance travel frequently occurs within a long period of time (CASE 2). The threshold value is set lower than the threshold value according to the normal range of the battery voltage of CASE 2, and the reason is as described above.

In case of CASE 1, the FATC 20 calculates the driving time from the vehicle speed sensor 15 and the driving distance from the vehicle speed sensor 15 to determine whether short-range driving occurs. If it is less than the threshold value, it is determined that the driving is a short distance.

In addition, in order to determine whether the short-range driving occurs frequently, when the number of short-range driving exceeds a predetermined number of times, it is determined that the short-range driving occurs frequently.

In addition, when the short-range driving occurs frequently, since the battery voltage is not likely to be in the normal range, the battery voltage signal is received through the general port of the microcomputer, and whether the battery voltage signal is less than a preset threshold value is determined. If it is determined that the voltage signal does not have a voltage suitable for driving the auxiliary heater 40 (less than the threshold value), a warning signal is output to the user while limiting the operation of the auxiliary heater 40.

When the battery voltage is restored or not, the auxiliary heater is driven when the battery voltage is within a range in which the auxiliary heater 40 can be normally operated.

On the other hand, if the driving time, the number of driving, the battery voltage signal, etc. in the case 1 does not match (Otherwise), the auxiliary heater 40 is driven, even if the auxiliary heater 40 is operated in the bet mode for energy saving Switch to (Recirulation Mode) so as not to use energy to increase the temperature of the cold outside air, and even while driving the auxiliary heater 40, when the battery voltage signal is received and the battery is below a predetermined specific voltage, PWM ( Pulse Width Modulation) is used to control the auxiliary heater 40 using periodic on / off.

In case of CASE 2, the FATC 20 calculates a travel time from the vehicle speed sensor 15 and a travel distance from the vehicle speed sensor 15 to determine whether short-range travel occurs. If it is less than the value, it is determined that the driving is short.

In addition, in order to determine whether the short-range driving occurs frequently, when the number of short-range driving exceeds a predetermined number of times, it is determined that the short-range driving occurs frequently.

In addition, when the short-range driving occurs frequently, since the battery voltage is not likely to be in the normal range, the battery voltage signal is received through the general port of the microcomputer, and whether the battery voltage signal is less than a preset threshold value is determined. If it is determined that the voltage signal does not have a voltage suitable for driving the auxiliary heater 40 (less than the threshold value), a warning signal is output to the user while limiting the operation of the auxiliary heater 40.

At this time, the battery voltage threshold value in CASE 2 is higher than the battery voltage threshold value in CASE 1 because the short-term driving frequently occurs within a long time, in case of a rechargeable battery, when the vehicle is not used for a long time, Set the battery voltage threshold higher because it can be recharged.

When the battery voltage is restored or not, the auxiliary heater is driven when the battery voltage is within a range capable of operating the auxiliary heater 40 normally.

On the other hand, if the driving time, the number of driving, the battery voltage signal, etc. in the case 2 does not match (Otherwise), the auxiliary heater 40 is driven, but the bet mode for energy saving even if the auxiliary heater 40 operates Switch to (Recirulation Mode) so as not to use energy to increase the temperature of the cold outside air, and even while driving the auxiliary heater 40, when the battery voltage signal is received and the battery is below a predetermined specific voltage, PWM ( Pulse Width Modulation) to control the auxiliary heater 40 by using a periodic on / off.

2 is a block diagram schematically illustrating driving of an auxiliary heater of a vehicle FATC and an engine control unit according to the present invention. As shown in the figure, the vehicle FATC system 1 according to the present invention is an auxiliary temperature sensor 11, an outside air temperature sensor 13, the vehicle speed sensor 15, the FATC 20 and the engine control unit 30 It comprises a heater 40 and a CAN (50).

Here, the vehicle FATC system 1 is provided to receive sensing values of various sensors as input signals according to a temperature set by a user, and adjust the temperature automatically based on the input signal.

In addition, among the various sensor inputs of the vehicle FATC system 1, an internal air sensor 11 installed inside the vehicle bumper and an internal air temperature sensor for sensing the temperature inside the vehicle to detect the outside air temperature of the vehicle. The temperature sensor (Incar Sensor, 13) to check whether the winter is necessary to drive the auxiliary heater (40).

At this time, when the FATC 20 is driven while the engine is not sufficiently heated in winter, the air quality that is not sufficiently heated in the air conditioning apparatus (not shown) of the FATC 20 may be impaired the emotional quality. Therefore, the auxiliary heater 40 is provided to eliminate such a phenomenon.

In addition, the auxiliary heater (Auxillary Heater 40) is preferably provided as an electric auxiliary heater (Electric Auxillary Heater), in this embodiment, the auxiliary heater request signal output from the FATC 20 and the auxiliary of the engine control unit 30. The auxiliary heater 40 is controlled in combination with other conditions that disable the heater operation.

In addition, the battery voltage signal of the vehicle is transmitted through the CAN 50. When the battery voltage is not within the normal range, the auxiliary heater 40 is controlled to be not driven or limited, or to the PWM type periodic on / off. Can be controlled.

To this end, it should be possible to monitor the voltage of the battery and determine whether or not it is within a normal range in which the auxiliary heater can be driven.

Receives the battery voltage signal from the general port of the microcomputer to the CAN 50 connected to the FATC 20 and the engine control unit 30, receives the vehicle speed detection value from the vehicle speed sensor 15, and calculates the driving distance to the CAN 50. Received through

In addition, the driving time (traveling time = traveling distance / vehicle speed) may be calculated based on the vehicle speed received from the vehicle speed sensor 15 and the traveling distance received from the CAN 50. Check for frequent occurrences.

That is, when the short-range driving occurs frequently, in the case of the rechargeable vehicle battery, the discharge rate is increased, and thus the battery cannot be within a range in which the battery can operate normally. Thus, the voltage of the battery is monitored to monitor the auxiliary heater 40. ) To determine whether to drive.

Here, the normal range of the voltage of the battery is divided into a case of short-term and a long-term case, because the reason is that if a short distance is frequently driven within a short period, there is no time for the battery to be charged, and the driving range of the battery voltage is lowered. This is because, if the short-distance driving is frequently performed within a long period of time, the time for charging the battery is relatively larger than that of the short-term, so that the driving range of the battery voltage is increased.

Therefore, in the FATC 20, the short distance travel frequently occurs within a short period of time (CASE 1) and the short distance travel frequently occurs within a long period of time (CASE 2). The threshold value is set lower than the threshold value according to the normal range of the battery voltage of CASE 2, and the reason is as described above.

In case of CASE 1, the FATC 20 calculates the travel time from the vehicle speed sensor 15 and the travel distance from the vehicle speed sensor 15 to determine whether short-range travel occurs. If it is less than the value, it is determined that the driving is short.

In addition, in order to determine whether the short-range driving occurs frequently, when the number of short-range driving exceeds a predetermined number of times, it is determined that the short-range driving occurs frequently.

In addition, when the short-range driving occurs frequently, since the battery voltage is not likely to be in the normal range, the battery voltage signal is received through the general port of the microcomputer, and whether the battery voltage signal is less than a preset threshold value is determined. If it is determined that the voltage signal does not have a voltage suitable for driving the auxiliary heater 40 (less than the threshold value), the engine control unit sends a signal for limiting the operation of the auxiliary heater 40 and a signal for warning the user. Output to (30).

In addition, the engine control unit 30 controls the auxiliary heater 40 in combination with other conditions that disable the operation of the auxiliary heater 40. As a result, if the auxiliary heater 40 does not satisfy the condition to be driven, The operation of the auxiliary heater 40 is limited, and a warning signal for the battery voltage is output to the user.

When the battery voltage is restored or not, the auxiliary heater is driven when the battery voltage is within a range in which the auxiliary heater 40 can be normally operated.

On the other hand, if the driving time, the number of driving, the battery voltage signal, etc. in CASE 1 does not match (Otherwise), the auxiliary heater 40 is driven, but in combination with the disabled condition of the engine control unit 30 Even when the auxiliary heater 40 is operated, it is switched to a betting mode (Recirulation Mode) to save energy so as not to use energy to increase the temperature of cold outside air, and while driving the auxiliary heater 40. In response to receiving the battery voltage signal, when the battery is below a predetermined specific voltage, the auxiliary heater 40 is controlled by using a pulse width modulation (PWM) type periodic on / off.

In case of CASE 2, the FATC 20 calculates a travel time from the vehicle speed sensor 15 and a travel distance from the vehicle speed sensor 15 to determine whether short-range travel occurs. If it is less than the value, it is determined that the driving is short.

In addition, in order to determine whether the short-range driving occurs frequently, when the number of short-range driving exceeds a predetermined number of times, it is determined that the short-range driving occurs frequently.

In addition, when the short-range driving occurs frequently, since the battery voltage is not likely to be in the normal range, the battery voltage signal is received through the general port of the microcomputer, and whether the battery voltage signal is less than a preset threshold value is determined. If it is determined that the voltage signal does not have a voltage suitable for driving the auxiliary heater 40 (less than the threshold value), the engine controller 40 outputs a warning signal to the user while limiting the operation of the auxiliary heater 40. Send a signal to

Here, the engine control unit 40 controls the auxiliary heater 40 in combination with other conditions for disabling the operation of the auxiliary heater 40, and the combined result is suitable for operating the auxiliary heater 40. If not, the auxiliary heater 40 is controlled to output a warning signal to the user while limiting the operation of the auxiliary heater 40.

At this time, the battery voltage threshold value in CASE 2 is higher than the battery voltage threshold value in CASE 1 because the short-term driving frequently occurs within a long time, in case of a rechargeable battery, when the vehicle is not used for a long time, Set the battery voltage threshold higher because it can be recharged.

When the battery voltage is restored or not, the auxiliary heater is driven when the battery voltage is within a range in which the auxiliary heater 40 can be normally operated.

On the other hand, if the driving time, the number of running, the battery voltage signal, etc. in the case 2 does not match (Otherwise), the auxiliary heater 40 is driven in combination with the disabled condition of the engine control unit 40, Even if the auxiliary heater 40 is operated, the energy saving mode is switched to a betting mode so that energy is not used to increase the temperature of cold external air, and the battery voltage signal is driven even while the auxiliary heater 40 is driven. In response to receiving the battery, the auxiliary heater 40 is controlled by using a pulse width modulation (PWM) type periodic on / off when the battery is below a predetermined specific voltage.

3 is a flowchart schematically illustrating a method of driving an auxiliary heater of a vehicle FATC according to the present invention. As shown in the figure, the auxiliary heater driving method of the vehicle FATC according to the present invention starts by detecting the internal temperature and the outside air temperature of the vehicle by the external air temperature sensor and the air temperature sensor of the FATC (S10).

Then, it is determined whether the winter season by the temperature information (S20), and if it is not the winter season, the auxiliary heater driving method of the vehicle FATC according to the present invention is terminated because there is no need to drive the auxiliary heater.

In addition, if it is determined that the winter season by the temperature information (S20), the driving distance and the vehicle speed signal is received to calculate the driving time (S30).

Here, the case of short term and the case of long term will be explained separately.

At this time, it is divided into a short-term and a long-term case, and the normal range of the voltage of the battery is divided. The reason is that if a short-distance driving is frequently performed within a short period, the battery does not have time to be charged, and the driving range of the battery voltage is lowered. This is because, if the short-distance driving is frequently performed within a long period of time, the time for charging the battery is relatively larger than that of the short-term, so that the driving range of the battery voltage is increased.

Therefore, in FATC, when the short-range driving frequently occurs within a short period (CASE 1) and the short-range driving frequently occurs within the long period (CASE 2), the control is divided into a threshold value according to the normal range of the battery voltage of CASE 1 Is set lower than the threshold according to the normal range of the battery voltage of CASE 2, and the reason is as described above.

In case of CASE 1, the FATC calculates a travel time from the vehicle speed sensor based on a vehicle speed sensor and a travel distance to determine whether a short distance travel occurs, and if the travel time is less than a preset threshold, short distance travel is performed. Judge.

In addition, in order to determine whether the short-range driving occurs frequently, when the number of short-range driving exceeds a predetermined predetermined number, it is determined that the short-range driving occurs frequently (S41).

In addition, when the short-range driving occurs frequently, since the battery voltage is not likely to be in the normal range, the battery voltage signal is received through the general port of the microcomputer (S43), and the battery voltage signal is determined to be below a preset threshold. If it is determined that the battery voltage signal does not have an appropriate voltage for driving the auxiliary heater (less than the threshold value), a warning signal is output to the user while limiting the operation of the auxiliary heater (S71).

When the battery voltage is restored or not (S73), the auxiliary heater is driven when the battery voltage is within a range capable of operating the auxiliary heater normally (S60).

On the other hand, if the driving time, the number of running, the battery voltage signal, etc. in the case CASE 1 does not match (Otherwise), the auxiliary heater is driven (S60).

In case of CASE 2, the FATC calculates the driving time from the vehicle speed sensor based on the vehicle speed sensor and the driving distance to determine whether short-range driving occurs. To judge.

In addition, in order to determine whether the short-range driving occurs frequently, if the number of short-range driving exceeds a predetermined number of times, it is determined that the short-range driving occurs frequently (S51).

In addition, when the short-range driving occurs frequently, since the battery voltage is not likely to be in the normal range, the battery voltage signal is received through the general port of the microcomputer, and whether the battery voltage signal is less than a preset threshold value is determined. If it is determined that the voltage signal does not have a voltage suitable for driving the auxiliary heater (less than the threshold value), a warning signal is output to the user while limiting the operation of the auxiliary heater (S71).

At this time, the battery voltage threshold value in CASE 2 is higher than the battery voltage threshold value in CASE 1 because the short-term driving frequently occurs within a long time, in case of a rechargeable battery, when the vehicle is not used for a long time, Set the battery voltage threshold higher because it can be recharged.

When the battery voltage is restored or not (S73), the auxiliary heater is driven when the battery voltage is within a range capable of operating the auxiliary heater normally (S60).

On the other hand, if the running time, the number of running, the battery voltage signal, etc. in CASE 2 does not match (Otherwise), the auxiliary heater is driven (S60).

4 is a flowchart schematically illustrating a driving method for reducing power when driving an auxiliary heater of a vehicle FATC according to the present invention. As shown in the figure, the auxiliary heater driving method of the FATC for a vehicle according to the present invention starts at step S60 in which the auxiliary heater is operated.

Here, even if the auxiliary heater is operated to switch to a betting mode (Recirulation Mode) for energy saving so as not to use energy to increase the temperature of the cold outside air, even while driving the auxiliary heater, the battery voltage signal When receiving the battery (S63) when the battery is less than the predetermined specific voltage (S65), the auxiliary heater is controlled by using a pulse width modulation (PWM) type periodic on / off (S67).

5 is a flowchart schematically illustrating a driving method of controlling an auxiliary heater for a vehicle according to the present invention with a battery discharge amount according to time. As shown in the figure, the auxiliary heater driving method of the vehicle FATC according to the present invention is as follows.

In the case of frequent short runs, the amount of battery discharge due to frequent use of auxiliary heaters should be taken into account.

For this purpose, the following equation is defined.

ΔV =-∫ Engine RPM dt + auxiliary heater on dt

ΔV is the discharge amount, and as shown in the drawing, if the discharge amount gradually increases, the operation of the warning or auxiliary heater is lowered in section A, and the operation of the warning and auxiliary heater is restricted in section E. A value of '0' or-indicates the state of full charge.

In this case, when the discharge amount is low, a warning signal is output to the user, and the auxiliary heater is weakly controlled, but the performance is weakly controlled. As the discharge amount is increased, the auxiliary heater is controlled to be completely restricted, thereby driving the flexible auxiliary heater. Is made possible.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to such specific embodiments, and those skilled in the art are appropriate within the scope described in the claims of the present invention. It will be possible to change.

As described above, the present invention having the configuration as described above can be flexibly controlled by monitoring the battery voltage in driving the auxiliary heater in winter, and taking into account the variable of frequent occurrence of short-distance driving that easily discharges the battery. This can be divided into a long period of time where the battery can be charged and a short period of time, which can be controlled, and the auxiliary heater can be controlled accordingly, and the auxiliary heater can be controlled in combination with the disable condition of the engine control unit. In order to minimize the discharge amount, by controlling the PWM periodic on / off, it is possible to control the auxiliary heater in a fluid manner to the battery voltage.

Claims (8)

A first step of confirming whether the winter is driving the auxiliary heater from the internal and external air temperature sensors of the vehicle; In winter, the auxiliary heater is driven, but the driving time is calculated by the driving distance and speed of the vehicle, and when the short-range driving occurs frequently, and when the battery voltage is lower than the threshold value, the driving of the auxiliary heater is restricted and a warning signal is output. Outputting a second step; Auxiliary heater driving method of a vehicle FATC comprising a. The method of claim 1, The second step is The battery voltage threshold when the short-range driving occurs frequently for a short period is lower than the battery voltage threshold when the short-range driving occurs frequently during the long distance. The method of claim 1, The auxiliary heater is provided as an electric auxiliary heater is driven by a signal of the FATC or driven by a combination of the signal of the FATC signal and the engine control unit, characterized in that the auxiliary heater driving method for a vehicle FATC. The method of claim 3, The second step is A method of driving an auxiliary heater of a FATC for a vehicle, characterized in that a signal for limiting driving of the electric auxiliary heater in the FATC is transmitted to the electric auxiliary heater to limit the driving in the electric auxiliary heater and output a warning signal. The method of claim 3, The second step is In the vehicle FATC, characterized in that the engine control unit receives a signal for limiting the driving of the electric auxiliary heater in combination with the conditions to deactivate the operation of the electric auxiliary heater to limit the operation of the electric auxiliary heater and output a warning signal. How to drive an auxiliary heater. The method of claim 1, The second step is When the auxiliary heater is driven, the external air mode is switched to an internal air mode that circulates the air inside the vehicle and blows it into the internal air of the vehicle, and when the battery voltage is received and is lower than a specific voltage, the PWM type periodic on Auxiliary heater driving method of the FATC for a vehicle, characterized in that by controlling the auxiliary heater through / off. The method according to claim 4 or 5 or 6, The auxiliary heater driving method of the vehicle FATC, characterized in that for driving the auxiliary heater, if the battery voltage is recovered above the threshold value or above a specific voltage. The method of claim 1, The detection value of the internal, external air temperature sensor, the vehicle speed signal, and the battery voltage signal is connected to the CAN system is transmitted and received by the FATC and the engine control unit auxiliary heater driving method of the vehicle.

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