KR20200133116A - System and method of diagnosing fuse for vehicle - Google Patents

Abstract

Disclosed is a fuse diagnostic system for a vehicle which enables preventive checks before a fuse opens. The fuse diagnostic system for the vehicle comprises: a fuse installed in a power system of a vehicle; a current sensor detecting a current flowing through the fuse; a temperature sensor detecting the indoor temperature of the vehicle; and a controller operating a deterioration rate of the fuse based on a current detection value detected from the current sensor, a change amount of the current detection value, and a temperature detection value detected from the temperature sensor.

Description

Vehicle fuse diagnostic system and method {SYSTEM AND METHOD OF DIAGNOSING FUSE FOR VEHICLE}

The present invention relates to a system and method for diagnosing a fuse for a vehicle, and more particularly, a fuse diagnosis system for a vehicle that enables a preventive check before the fuse is opened by calculating a deterioration rate of a fuse applied to an environmental vehicle in advance. And a method.

An environmental vehicle is a vehicle that generates power to rotate a wheel by driving a motor using electric energy stored in a battery. Since the motor for driving a wheel used in an environmental vehicle is driven using a very high voltage electric power, various safety devices are provided for electrical safety of a high voltage system.

As one of these safety devices, the fuse in environmental vehicles plays the role of a high-voltage electric energy transmission path under normal use conditions, and protects users from electric shock accidents and prevents system damage by opening the electric circuit in failure situations such as system short circuits. Plays a role.

In particular, when compared to industrial fuses that are fixed in a specific place and applied with a constant load, fuse for environmental vehicles is applied with fluctuating loads under severe conditions according to various driving conditions of the vehicle. An electrical circuit that is not open may occur, resulting in a problem in which the system stops operating.

The matters described as the background art are only for enhancing an understanding of the background of the present invention, and should not be taken as acknowledging that they correspond to the prior art already known to those of ordinary skill in the art.

KR 10-1795319 B1

Accordingly, the present invention solves the provision of a vehicle fuse diagnosis system and method that calculates the deterioration rate according to the cumulative use of the environmental vehicle fuse and enables preventive inspection of the fuse before unwanted opening occurs when the deterioration rate is higher than a specific deterioration rate. It is a technical task to be done.

The present invention as a means for solving the above technical problem,

Fuses installed in the vehicle's power system;

A current sensor detecting a current flowing through the fuse;

A temperature sensor that detects the indoor temperature of the vehicle; And

A controller for calculating a deterioration rate of the fuse based on a current detection value detected by the current sensor, a change amount of the current detection value, and a temperature detection value detected by the temperature sensor;

It provides a fuse diagnostic system for a vehicle comprising a.

In one embodiment of the present invention, the controller includes: a thermal model storage unit which pre-stores a thermal model modeling a relationship between a current flowing through the fuse and a temperature of the fuse; A life model storage unit which pre-stores a damage capacity of the fuse, a damage index for a temperature change amount of the fuse, a damage index for an average temperature of the fuse, and a relationship between the damage capacity and the temperature change amount and the average temperature; And in the vehicle driving section from the start of the vehicle until the vehicle is turned off, by estimating the temperature of the fuse using the thermal model to generate a temperature estimation value, and based on the change amount of the estimated temperature value and the average temperature, the It may include a deterioration rate calculator that calculates the deterioration rate of the fuse.

In one embodiment of the present invention, the deterioration rate calculator may calculate the average temperature by summing the average of the estimated temperature values and the average of the temperature detection values.

In one embodiment of the present invention, the controller includes: an accumulated deterioration rate storage unit configured to store an accumulated deterioration rate obtained by accumulating the deterioration rate calculated in the previous driving section of the vehicle; And updating the accumulated deterioration rate by adding the calculated deterioration rate to the deterioration rate stored in the accumulated deterioration rate storage unit, and pre-diagnosing the occurrence of deterioration failure of the fuse when the updated accumulated deterioration rate is greater than a preset diagnostic reference value. It may include a deterioration rate calculation unit.

In one embodiment of the present invention, the deterioration rate calculation unit counts the frequency at which the amount of change in the estimated temperature value occurs, the stress of the fuse corresponding to the change amount of each estimated temperature value, the counted frequency, and the preset fuse When disconnection occurs, the deterioration rate may be calculated during the vehicle driving section based on the applied frequency of a specific stress.

In one embodiment of the present invention, the deterioration rate calculation unit,

: 온도 변화량,

: 상기 평균 온도, α: 상기 온도 변화량에 대한 손상 지수, β: 상기 평균 온도에 대한 손상 지수, n_i: 상기 온도 변화량이 발생한 빈도수, N_i: 사전 설정된 퓨즈의 단선이 발생한 경우 특정 응력의 인가되는 되는 빈도수).As described above, the deterioration rate during the vehicle driving section can be calculated (D: the deterioration rate,

: Temperature change amount,

: The average temperature, α: the damage index for the temperature change amount, β: the damage index for the average temperature, n _i : the frequency at which the temperature change amount occurs, N _i : application of a specific stress when a pre-set fuse break occurs The number of times it becomes possible).

As another means for solving the above technical problem, the present invention,

In the vehicle fuse diagnosis method using the above-described vehicle fuse diagnosis system,

When the vehicle is started, estimating a temperature of a narrow portion of the fuse according to a current detection value that detects a current flowing through the fuse;

Counting a frequency of a temperature change amount, which is a change amount of the estimated temperature value;

Calculating an average temperature of the fuse when the vehicle is started; And

Calculating a deterioration rate of the fuse based on the temperature change amount, the frequency of the temperature change amount, and the average temperature;

It provides a vehicle fuse diagnosis method comprising a.

In an embodiment of the present invention, the calculating of the average temperature may include calculating an average value of the estimated temperature value; Calculating an average value of the vehicle interior temperature provided by the vehicle air conditioning system; And calculating the average temperature by summing the average value of the estimated temperature value and the average value of the indoor temperature of the vehicle.

In one embodiment of the present invention, the calculating of the deterioration rate includes counting the frequency at which the amount of change in the estimated temperature value occurs, the stress of the fuse corresponding to the amount of change in each estimated temperature value, the counted frequency, and a dictionary When the set fuse is disconnected, the deterioration rate may be calculated during the vehicle driving section based on the applied frequency of a specific stress.

In one embodiment of the present invention, the step of calculating the deterioration rate comprises:

: 온도 변화량,

: 상기 평균 온도, α: 상기 온도 변화량에 대한 손상 지수, β: 상기 평균 온도에 대한 손상 지수, n_i: 상기 온도 변화량이 발생한 빈도수, N_i: 사전 설정된 퓨즈의 단선이 발생한 경우 특정 응력의 인가되는 되는 빈도수).As described above, the deterioration rate during the vehicle driving section can be calculated (D: the deterioration rate,

: Temperature change amount,

: The average temperature, α: the damage index for the temperature change amount, β: the damage index for the average temperature, n _i : the frequency at which the temperature change amount occurs, N _i : application of a specific stress when a pre-set fuse break occurs The number of times it becomes possible).

According to an embodiment of the present invention, when the vehicle is turned off, the step of updating a cumulative deterioration rate by summing the deterioration rate calculated in the step of calculating the deterioration rate to a previously stored deterioration rate; And pre-diagnosing occurrence of a deterioration failure of the fuse when the updated cumulative deterioration rate is greater than a preset diagnosis reference value.

According to the vehicle fuse diagnosis system and method, a high-voltage fuse is performed by estimating a temperature behavior of a fuse to estimating a cumulative deterioration rate due to a temperature change in a narrow portion of the fuse, and comparing the estimated cumulative deterioration rate with a preset diagnostic reference value. Deterioration failure can be prevented in advance.

Through this, according to the vehicle fuse diagnosis system and method, by preventing a high voltage fuse deterioration failure in advance, it is possible to solve the inconvenience caused by an unexpected vehicle failure (vehicle stop), and to prevent the user from the danger caused by the vehicle stop. You can protect it safely.

1 is a block diagram showing a fuse diagnosis system for a vehicle according to an embodiment of the present invention.
2 is a block diagram showing in more detail a controller of a fuse diagnostic system for a vehicle according to an embodiment of the present invention.
3 is a flowchart illustrating a method for diagnosing a vehicle fuse according to an embodiment of the present invention.

Hereinafter, a vehicle fuse diagnosis system and method according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a fuse diagnosis system for a vehicle according to an embodiment of the present invention.

Referring to FIG. 1, a vehicle fuse diagnosis system according to an embodiment of the present invention includes a fuse 11 installed in a vehicle power system, a current sensor 40 detecting a current flowing through the fuse 11, and a vehicle Of the fuse 11 based on the temperature sensor 50 that detects the indoor temperature of, and the amount of change of the current detection value and current detection value detected by the current sensor 40 and the temperature detection value detected by the temperature sensor 50. It may be configured to include a controller 100 for calculating the cumulative deterioration rate.

A fuse diagnosis system according to an embodiment of the present invention is for diagnosing a fuse 11 provided in a high voltage power system of an environmental vehicle. The high voltage power system is largely a high voltage battery 10 and an inverter 20 that converts DC power stored in the high voltage battery 10 into polyphase AC power, and a motor that generates rotational power by receiving multiphase AC power converted from the inverter 20. (30) may be included.

The fuse 11 is installed in a high voltage power system of an environmental vehicle and is disconnected when an overcurrent occurs due to a problem such as a short circuit to protect the high voltage power system and a driver or a maintenance person. The vehicle fuse 11 may be located on a conductive path for power transmission in terms of an electric power system for driving a motor of the vehicle. For example, the vehicle fuse 11 may be connected between the battery cells 13 connected in series in the battery pack 10. Of course, in another embodiment, the fuse 11 may be connected between the battery pack 10 to connect the battery cells 13 outside the battery pack 10, and the input terminal or output terminal of the battery pack 10 and the battery cell 13 It can also be connected between. The connection position of the fuse 11 may be variously changed as necessary.

The fuse 11 has a narrow portion in which an electrical connection is formed in a narrow width in order to facilitate disconnection when an overcurrent occurs. The fuse 11 is deteriorated as thermomechanical cyclic stress fatigue accumulates in the narrow portion due to fluctuations in load current and environmental temperature.

As a factor that provides thermomechanical cyclic stress fatigue in the narrow portion of the fuse 11, that is, a factor that causes deterioration of the fuse 11, the temperature change amount (ΔT) due to cyclic thermal load and the average temperature due to continuous thermal load (T _avg ) Can be considered.

Considering the cyclic thermal load and continuous thermal load, the fuse life model is created as shown in Equation 1 below.

[Equation 1]

In Equation 1,'N' is the life of the fuse,'C' is the damage capacity of the fuse,'α' is the damage index for the temperature change (△T), and'β' is the damage to the average temperature (T _avg ). It is an index. The damage capacity (C) and damage index (α, β) of the fuse are unique characteristics of the fuse determined during manufacture of the fuse, and thus may be values provided in the specifications of the fuse provided by the fuse manufacturer. Otherwise, the damage capacity (C) and damage index (α, β) of the fuse may be derived in advance through a principle experiment for the fuse.

On the other hand, the repetitive thermal load, which is a factor that deteriorates the fuse 11, may be caused by a change in the current flowing through the fuse 11, and the continuous thermal load is the environmental temperature at which the fuse 11 is exposed and the flow through the fuse 11 It can be caused by the magnitude of the current.

Various embodiments of the present invention calculate the cumulative deterioration rate of a fuse based on current and temperature, which are factors of such repeated thermal loads and continuous thermal loads, and before failure due to deterioration of the fuse occurs according to the cumulative deterioration rate. This is to enable preventive checks.

The current sensor 40 is for detecting a current flowing through the fuse 11, and when the fuse 11 is provided between the battery cells 13 in the battery pack 10, the current sensor 40 is a battery current sensor provided in the battery pack 10. Can be replaced.

The temperature sensor 50 is for detecting the indoor temperature of the vehicle and may be replaced with a temperature sensor provided in the air conditioning system of the vehicle. In particular, in terms of using communication between several unit systems provided in the vehicle, the temperature detection value provided to the controller 100 can be viewed as being provided from the air conditioning system 50.

The controller 100 uses the detected value of the current flowing through the fuse 10 detected by the current sensor 40, the amount of change, and the indoor temperature of the vehicle inputted from the vehicle air conditioning system (or temperature sensor) 50. The deterioration and cumulative deterioration rate of the fuse 11 generated during driving may be calculated.

The controller 100 according to the exemplary embodiment of the present invention includes a nonvolatile memory (not shown) configured to store data related to an algorithm configured to control the operation of various components of a vehicle or a software instruction playing the algorithm, and the corresponding It may be implemented including a processor (not shown) configured to perform the operations described below using data stored in the memory. Here, the memory and the processor may be implemented as separate chips or as a single chip integrated with each other. The processor may be implemented in the form of one or more processors.

2 is a block diagram showing in more detail a controller of a fuse diagnostic system for a vehicle according to an embodiment of the present invention.

Referring to FIG. 2, the controller 100 includes a thermal model storage unit 110, a life model storage unit 130, a deterioration rate operation unit 150, an accumulated deterioration rate operation unit 170, and an accumulated deterioration rate storage unit 190. It can be configured to include.

The thermal model storage unit 110 stores a thermal model for estimating the thermal behavior of the fuse 10 according to the current flowing through the fuse 10. In more detail, an equation for estimating the thermal behavior of the narrow portion of the fuse 10 according to the current flowing through the fuse 10 may correspond to the thermal model. The thermal model modeling the amount of heat generated according to the magnitude of the flowing current may be formed by various methods known in the art, and in particular, a manufacturer of the fuse 11 may provide the fuse specification as a specification.

The life model storage unit 130 may store the life model as shown in Equation 1 above, and the damage index (α) for the damage capacity (C), the temperature change amount (△T), and the damage index for the average temperature (T _avg ) (β) can be stored.

The cumulative deterioration rate storage unit 190 may store the deterioration rate of the fuse 11 calculated while the vehicle is running every time the vehicle is driven.

The thermal model storage unit 110, the life model storage unit 130, and the cumulative deterioration rate storage unit 190 may be implemented as a nonvolatile memory of the controller 100.

The deterioration rate calculation unit 150 receives a current detection value that detects the magnitude of the current flowing through the fuse 11 from the current sensor 40, and receives a detection value of the indoor temperature of the vehicle from the vehicle's air conditioning system (or temperature sensor) 50. Is received, and the deterioration rate of the narrow portion of the fuse 11 generated while the vehicle is running is calculated using the input detection values, the thermal model and the life model.

The cumulative deterioration rate calculation unit 170 updates the cumulative deterioration rate of the narrow portion of the fuse 11 by summing the deterioration rate calculated by the deterioration rate calculation unit 150 and the deterioration rate accumulated during the previous driving, and the updated cumulative deterioration. By comparing the rate with a preset diagnostic reference value, it is possible to determine if preventive maintenance is required.

The operation and effect of the vehicle fuse diagnosis system according to the various embodiments of the present invention configured as described above may be more clearly understood through a description of a method for diagnosing a vehicle fuse implemented using the same.

3 is a flowchart illustrating a method for diagnosing a vehicle fuse according to an embodiment of the present invention.

Referring to FIG. 3, in the method for diagnosing a fuse for a vehicle according to an embodiment of the present invention, after the vehicle is started (S11), the deterioration rate calculating unit 150 of the controller 100 is performed by the current sensor 40 of the vehicle. A current detection value that detects the current (load current) flowing through the fuse 11 is input, and the narrowing of the fuse 11 according to the current detection value by using the thermal model of the fuse 11 stored in the thermal model storage unit 110 The negative temperature can be estimated (S21). This temperature estimation may be repeatedly performed at a constant cycle until the vehicle is turned off.

Subsequently, the deterioration rate calculating unit 150 of the controller 100 may count the frequency n _i for the temperature change amount ΔT using a temperature estimation value obtained by estimating the temperature of the narrow portion of the fuse 11 (S22). ). The deterioration rate calculation unit 150 continuously estimates the temperature of the narrow portion of the fuse 11 while the vehicle is running, as well as the frequency (n _i ) of the amount of change (ΔT) in the estimated temperature value generated through the temperature estimation operation. ) Can be counted. The temperature change is a value corresponding to the thermal stress, and as the number of times increases, the amount of damage provided to the narrow portion of the fuse 11 may be determined. In step S22, the number of times a temperature change corresponding to a specific thermal stress occurs is counted to enable calculation of damage due to thermal stress.

In step S22, the deterioration rate calculating unit 150 may count the frequency for each temperature change amount using a temperature change amount counting method of various techniques known in the art. For example, in step S22, the deterioration rate calculating unit 150 may apply an engineering counting method that measures the number of times according to the magnitude of temperature change, such as rainflow counting.

On the other hand, when the vehicle is started, the deterioration rate calculation unit 150 of the controller 100 may calculate an average value by receiving a detected value of the indoor temperature of the vehicle from the air conditioning system (or temperature sensor) 50 of the quantity ( S31).

Subsequently, the deterioration rate calculating unit 150 of the controller 100 may calculate an average of the estimated temperature of the narrow portion of the fuse 11 by using the temperature estimated value derived in step S21 (S23).

Subsequently, the deterioration rate calculating unit 150 of the controller 100 adds the average of the vehicle indoor temperature detection value calculated in step S31 and the average of the estimated temperature of the narrow part of the fuse 11 calculated in step S23. The average of the environmental temperatures of the fuse 11 (T _avg ) is calculated (S32).

Subsequently, the deterioration rate calculation unit 150 of the controller 100 calculates the damage caused by the repeated thermal load based on the temperature change amount (ΔT) and the number accordingly, and the average of the environmental temperature of the fuse 11 (T _avg ) Based on this, the damage caused by the continuous thermal load may be calculated to calculate the deterioration rate of the narrow portion of the fuse 11 that occurs while driving the vehicle (S41).

More specifically, in step S41, the deterioration rate calculation unit 150 includes the damage capacity (C) provided by the life model storage unit 130, the damage index α for the temperature change amount (ΔT), and the average temperature ( The deterioration rate of the narrow portion of the fuse 11 may be calculated using the damage index β for T _avg ).

The manufacturer of the fuse 11 may provide an S-N curve indicating the relationship between the thermal stress of the fuse 11 and the number of times the corresponding thermal stress is repeatedly provided. This S-N curve is a curve showing the relationship between the number of iterations a thermal stress is applied to and the upper limit of the temperature change it withstands. The vertical axis of the coordinates on which the SN curve is displayed corresponds to the thermal stress provided in the narrow part of the fuse 11, and the horizontal axis corresponds to the number of times the corresponding thermal stress is repeated, and the SN curve corresponds to the number of times the corresponding thermal stress is repeated. It is a curve showing the frequency at which disconnection occurs.

According to this curve, the degree of degradation can be expressed as a ratio between the frequency (N _i ) corresponding to each thermal stress and the actual measured frequency (n _i ). In other words, the degree of deterioration may appear as a ratio of the sum of the maximum frequency corresponding to the total temperature change and the sum of the actual measured frequency. If this is displayed again, the ratio of the damage amount and damage capacity according to the number of actual thermal stresses It can be expressed as Equation 2.

[Equation 2]

Here, the damage capacity corresponds to the product of the specific frequency (N _i ) indicated by the SN curve and the thermal stress at the corresponding frequency (N _i ), and the thermal stress is the product of the temperature change by the damage index (α) and the average temperature ( It corresponds to the product of the damage index (β) by T _avg ).

Considering this point, if Equation 1 is modified, the damage capacity can be calculated as shown in Equation 3 below.

[Equation 3]

)은 열응력과 그에 대응되는 실측된 빈도수의 곱에 해당하므로 다음의 식 4와 같이 표현될 수 있다.In addition, the damage amount of the fuse 11 (

) Corresponds to the product of the thermal stress and the measured frequency corresponding thereto, so it can be expressed as Equation 4 below.

[Equation 4]

Substituting Equation 3 and Equation 4 into Equation 2, the degradation rate can be calculated as shown in Equation 5 below.

[Equation 5]

The calculation of the deterioration rate performed in step S41 is repeated until the vehicle is turned off (S42), so that the deterioration rate of the narrow portion of the fuse 11 may be calculated during the vehicle driving.

Subsequently, the cumulative deterioration rate calculating unit 170 of the controller 100 updates the cumulative deterioration rate by summing the deterioration rate calculated in step S41 to the cumulative deterioration rate calculated by accumulating the deterioration rate calculated during the previous driving (S43). ), when the updated cumulative deterioration rate is greater than the preset diagnosis reference value (S44), a warning is made that a disconnection (opening) failure may occur in the narrow part of the fuse 11 so that a preventive diagnosis can be made (S45).

When the updated cumulative deterioration rate in step S44 is less than a preset diagnosis reference value, the updated cumulative deterioration rate may be stored in the cumulative deterioration rate storage unit 190 and wait for the next driving.

As described above, in the vehicle fuse diagnosis system and method according to various embodiments of the present invention, the temperature behavior of the fuse is estimated to estimate the cumulative deterioration rate due to the temperature change in the narrow part of the fuse, and the estimated cumulative deterioration rate and High voltage fuse deterioration failure can be prevented in advance by comparing the size of the set diagnostic reference value. In this way, by preventing deterioration of the high voltage fuse in advance, inconvenience caused by an unexpected vehicle failure (vehicle stop) can be eliminated, and a user can be safely protected from dangers caused by a vehicle stop.

Although shown and described in connection with specific embodiments of the present invention above, it will be apparent to those of ordinary skill in the art that the present invention can be variously improved and changed within the scope of the claims. .

10: battery 11: fuse
40: current sensor 50: air conditioning system (temperature sensor)
100: controller 110: thermal model storage unit
130: life model storage unit 150: deterioration rate calculation unit
170: cumulative deterioration rate calculation unit 190: cumulative deterioration rate storage unit

Claims (11)

Fuses installed in the vehicle's power system;
A current sensor detecting a current flowing through the fuse;
A temperature sensor that detects the indoor temperature of the vehicle; And
A controller for calculating a deterioration rate of the fuse based on a current detection value detected by the current sensor, a change amount of the current detection value, and a temperature detection value detected by the temperature sensor;
Vehicle fuse diagnostic system comprising a. The method according to claim 1, wherein the controller,
A thermal model storage unit which pre-stores a thermal model modeling a relationship between a current flowing through the fuse and a temperature of the fuse;
A life model storage unit which pre-stores a damage capacity of the fuse, a damage index for a temperature change amount of the fuse, a damage index for an average temperature of the fuse, and a relationship between the damage capacity and the temperature change amount and the average temperature; And
In the vehicle driving section from the start of the vehicle until the vehicle is turned off, a temperature estimate is generated by estimating the temperature of the fuse using the thermal model, and the fuse is based on a change amount of the estimated temperature value and the average temperature. A fuse diagnosis system for a vehicle, comprising a deterioration rate calculating unit that calculates a deterioration rate of. The method according to claim 2, wherein the deterioration rate calculation unit,
And calculating the average temperature by summing the average of the estimated temperature values and the average of the temperature detection values. The method of claim 2, wherein the controller,
An accumulative deterioration rate storage unit for storing an accumulative deterioration rate obtained by accumulating deterioration rates calculated in a previous driving section of the vehicle; And
The accumulated deterioration rate is updated by adding the calculated deterioration rate to the deterioration rate stored in the accumulated deterioration rate storage unit, and when the updated accumulated deterioration rate is greater than a preset diagnostic reference value, a deterioration failure of the fuse is diagnosed in advance. A vehicle fuse diagnostic system comprising a rate calculating unit. The method according to claim 2, wherein the deterioration rate calculation unit,
Counts the frequency at which the amount of change in the estimated temperature value occurs, and based on the stress of the fuse corresponding to the amount of change in each estimated temperature value, the counted frequency, and the frequency to which a specific stress is applied when a preset disconnection of the fuse occurs As a vehicle fuse diagnosis system, characterized in that calculating the deterioration rate during the vehicle driving section. The method according to claim 5, wherein the deterioration rate calculation unit,
expression

A fuse diagnosis system for a vehicle, characterized in that the deterioration rate is calculated during the vehicle driving section (D: the deterioration rate,

: Temperature change amount,

: The average temperature, α: the damage index for the temperature change amount, β: the damage index for the average temperature, n _i : the frequency at which the temperature change amount occurs, N _i : application of a specific stress when a pre-set fuse break occurs The number of times it becomes possible). In the vehicle fuse diagnostic method using the vehicle fuse diagnostic system of claim 1,
When the vehicle is started, estimating a temperature of a narrow portion of the fuse according to a current detection value that detects a current flowing through the fuse;
Counting a frequency of a temperature change amount, which is a change amount of the estimated temperature value;
Calculating an average temperature of the fuse when the vehicle is started; And
Calculating a deterioration rate of the fuse based on the temperature change amount, the frequency of the temperature change amount, and the average temperature;
Vehicle fuse diagnosis method comprising a. The method according to claim 7, wherein calculating the average temperature,
Calculating an average value of the estimated temperature values;
Calculating an average value of the vehicle interior temperature provided by the vehicle air conditioning system; And
And calculating the average temperature by summing the average value of the estimated temperature value and the average value of the indoor temperature of the vehicle. The method according to claim 7, wherein the step of calculating the deterioration rate,
Counts the frequency at which the amount of change in the estimated temperature value occurs, and based on the stress of the fuse corresponding to the amount of change in each estimated temperature value, the counted frequency, and the frequency to which a specific stress is applied when a preset disconnection of the fuse occurs A method for diagnosing a vehicle fuse, characterized in that the deterioration rate is calculated during a vehicle driving section. The method of claim 9, wherein calculating the deterioration rate,
expression

A method for diagnosing a fuse for a vehicle, characterized in that the deterioration rate is calculated during the vehicle driving section (D: the deterioration rate,

: Temperature change amount,

: The average temperature, α: the damage index for the temperature change amount, β: the damage index for the average temperature, n _i : the frequency at which the temperature change amount occurs, N _i : application of a specific stress when a pre-set fuse break occurs The number of times it becomes possible). The method of claim 7,
When the vehicle is turned off, updating a cumulative deterioration rate by summing the deterioration rate calculated in the step of calculating the deterioration rate to a previously stored deterioration rate;
And diagnosing the occurrence of a deterioration failure of the fuse in advance when the updated cumulative deterioration rate is greater than a preset diagnosis reference value.

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