JPH11139223A - Abnormality detector device for wire harness for vehicle, alarm device for vehicle and power supply device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality detector device of wire harness for a vehicle and an alarm device for a vehicle whereby abnormality of wire harness of layer short or the like is properly and easily detected, further deterioration of the wire harness can be avoided. SOLUTION: A linear thermistor 22 is arranged so as to be wound or adjacent to a wire harness 21 arranged in a vehicle, and by detecting abnormality of the wire harness 21 based on a temperature detection output obtained by the linear thermistor 22, abnormality of the wire harness 21 can be properly and easily detected based on the temperature detection output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting an abnormality of a wire harness for a vehicle, an alarm device for a vehicle, and a power supply apparatus for a vehicle. Things.

[0002]

2. Description of the Related Art Conventionally, in a vehicle, power generated by a power supply unit such as a battery and an alternator is generally supplied to each load via a wire harness composed of a plurality of electric wires. Among these wires, wires connected to a load that requires a particularly large current (basic power supply wires) are connected to fusible links, so that when the voltage of a power supply unit such as a battery or alternator fluctuates, In this case, it is possible to prevent damage to each load and smoke from electric wires due to excessive current generated at the time of dead short.

As shown in FIG. 7, this type of electric wire generally has a structure in which a large number of core wires 1a are protected by an insulating coating layer 1b of polyvinyl chloride or the like. That is, the trunk power supply line and the branch power supply line are usually bundled and protected by extrapolating a soft vinyl chloride tube or winding the tape.
a can be prevented from leaking.

[0004]

However, in a vehicle, the wire core 1a comes into contact with the body due to deterioration of the insulating coating layer 1b over time, contact with the edge of the vehicle, and wear.
There may be a so-called dead short or rare short state. In the former case, the fusible link is blown and a vehicle fire is prevented. However, if the latter state continues, the heat generated in the core wire 1a causes the insulation coating layer 1 to be blown before the fusible link is blown.
As a result of heat generation of b, the insulating coating layer 1b may be further deteriorated.

Conventionally, as shown in FIG. 8, a conductive layer (hereinafter referred to as an outer conductor) 10a and a conductive layer (hereinafter referred to as an outer conductor) 10a The electric wire 10 is formed by providing the insulating coating layer 10b, and the lamp 12 is attached to the outer conductor 10a.
There has been proposed a wire harness protection device configured to apply the voltage of the power supply 11 via a power supply (see Japanese Utility Model Publication No. 7-4).
No. 7747).

According to this wire harness protection device, when the insulating coating layer 10b is damaged and the outer conductor 10a comes into contact with the body of the vehicle, a current flows through the lamp 12 and the lamp 1
By turning on 2, the user can be quickly notified of the damage of the wire harness, and further deterioration of the wire harness can be prevented.

However, in the conventional configuration shown in FIG. 8, the degree of damage to the wire harness is determined by looking at the lamp 12 which blinks as the external conductor 10a comes into contact with the body. Even if is lit, the degree of damage may not actually reach the point where the insulating film 1b is broken. Even in such a case, the user sees that the lamp 12 is lit, and unnecessarily replaces the wire harness.

As described above, in the conventional wire harness abnormality detecting device, there is a possibility that an abnormality is detected regardless of the actual degree of damage to the wire harness.

In addition to the method shown in FIG. 8, there is a method for detecting whether or not the wire harness is rarely short-circuited by detecting whether or not an intermittent pulse current is flowing in the wire harness.

However, the method of detecting an abnormality of a wire harness by detecting an abnormal current as described above requires another factor for detecting an abnormality caused by damage to the wire harness, that is, a variation in load current. , A detection process must be performed in consideration of a current value that changes according to the temperature and the remaining battery level. As a result, the process of detecting a power supply line abnormality becomes complicated, and the configuration for that must be complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has an object to detect an abnormality of a wire harness such as a rare short circuit accurately and easily, thereby avoiding further deterioration of the wire harness. It is an object of the present invention to propose a device, a vehicle alarm device, and a vehicle power supply device that can prevent further deterioration of a wire harness when a rare short circuit occurs.

[0012]

According to a first aspect of the present invention, there is provided a vehicle wire harness abnormality detecting apparatus comprising: a linear thermistor;
Is arranged so as to be wound around or adjacent to the wire harness (21) routed in the vehicle, and the temperature detection output obtained by the linear thermistor (22) is An abnormality of the wire harness (21) is detected based on the detection.

In the above configuration, the wire harness (2
When a rare short circuit occurs in 1), the wire harness (2)
The temperature of 1) rises to a certain temperature. At this time, the temperature of the linear thermistor (22) also increases accordingly, so that a temperature detection output corresponding to the temperature rise of the wire harness (21) is obtained from the linear thermistor (22).
Thus, an abnormality of the wire harness (21) can be detected based on the temperature detection output.

According to a second aspect of the present invention, there is provided a vehicle wire harness abnormality detecting apparatus, wherein the linear thermistor (22) is a linear thermistor element (3).
0), and extending the length of the thermistor element (30) so as to pass through the center of the thermistor element (30) or to be wound around the thermistor element (30). ) And a conducting wire (31) for applying a predetermined voltage.

In the above configuration, the thermistor element (3
The strength of 0) can be reinforced by the strength of the conducting wire (31) and a voltage can be easily applied to the thermistor element (30).

According to a third aspect of the present invention, there is provided a vehicle wire harness abnormality detecting apparatus for measuring an ambient temperature around which a wire harness is routed. ) And an abnormality determination circuit (23) for detecting an abnormality of the wire harness (21) based on the temperature detection output obtained by the environmental temperature measurement thermistor (24) and the temperature detection output obtained by the linear thermistor (22). And was prepared.

In the above configuration, the linear thermistor (2)
The temperature detection output obtained by 2) is affected by the environmental temperature together with the temperature of the wire harness (21), and the abnormality determination circuit (23) detects the temperature detected by the environmental temperature measuring thermistor (24). This is corrected by the output, and the abnormality of the wire harness (21) is detected based only on the temperature change of the wire harness (21). Thus, the abnormality of the wire harness (21) can be detected more accurately.

According to a fourth aspect of the present invention, there is provided a vehicle wire harness abnormality detecting apparatus comprising: a linear thermistor (22) and an environmental temperature measuring thermistor (24).
Are connected to each other to form a bridge circuit, and the abnormality determination circuit (23) detects an abnormality in the wire harness (21) based on an output of the bridge circuit.

In the above configuration, the difference between the temperature detection output of the linear thermistor (22) and the temperature detection output of the environmental temperature measuring thermistor (24) is obtained by a simple circuit configuration, and the difference of the wire harness (21) is obtained. An output based on only the temperature change can be obtained.

According to a fifth aspect of the present invention, there is provided a vehicle wire harness abnormality detecting apparatus including a self-diagnosis circuit for detecting a disconnection or a short circuit of a linear thermistor. did.

In the above configuration, if the linear thermistor (22) is disconnected or short-circuited, it is possible to know in advance that a normal abnormality is not currently detected, so that the abnormality can be detected. Reliability is improved.

According to a sixth aspect of the present invention, there is provided a vehicle wire harness abnormality detecting apparatus comprising: a linear thermistor (22) and an environmental temperature measuring thermistor (24).
A self-diagnosis circuit (25) for detecting disconnection or short-circuit of the device.

In the above configuration, if the linear thermistor (22) and the thermistor for environmental temperature measurement (24) are disconnected or short-circuited, it is determined in advance that a normal abnormality is not detected. Being able to know improves the reliability of abnormality detection.

According to a seventh aspect of the present invention, there is provided the vehicle wire harness abnormality detecting device, wherein the linear thermistor (22) includes a linear thermistor element (30);
An internal conductor (31) that is provided along the length direction of the thermistor element (30) so as to penetrate the center of the thermistor element (30) and applies a predetermined voltage to the thermistor element (30); A self-diagnosis circuit (25) that covers the (30) and has a predetermined voltage applied thereto, wherein the self-diagnosis circuit (25) is a linear thermistor when only the voltage value of the outer conductor (32) decreases. It is diagnosed that the linear thermistor (22) is disconnected when both the voltage value of the inner conductor (31) and the voltage value of the outer conductor (32) decrease. I did it.

As a result, the self-diagnosis of whether the linear thermistor (22) has a disconnection or a short circuit can be reliably performed, and the reliability of abnormality detection is further improved.

Further, the vehicle alarm device according to claim 8 made according to the present invention is characterized by claims 1 to 6 and 7.
And a warning means (2) for warning that there is an abnormality in the wire harness (21) when an abnormality is detected by the abnormality detection device.
6).

[0027] In the above configuration, the user can control the wiring harness (21) based on the alarm by the alarm means (26).
It is possible to know that an abnormality such as a rare short has occurred.

According to a ninth aspect of the present invention, there is provided a vehicle power supply apparatus for supplying battery power to a load (65) via a fusible link (62) and a wire harness (64) sequentially. The fusible link (62) is connected to the vehicle power supply device (60).
And a thermal fuse (6) that is blown when the temperature of the fusible link (62) exceeds a predetermined value.
7) and a power cutoff means (63) for cutting off the supply of battery power to the wire harness (64) when the thermal fuse (67) is blown.

As a result, even if a rare short circuit occurs in the wire harness (64), even if the temperature of the fusible link (62) does not rise and the fusible link (62) does not blow out. By effectively blowing the thermal fuse (67), further deterioration of the wire harness (64) due to a rare short which cannot be prevented by blowing the fusible link (62) can be prevented.

Further, in the power supply device for a vehicle according to the present invention, the fusing temperature characteristic of the thermal fuse (67) is selected to be lower than the fusing temperature of the fusible link (62). I did it.

In the above configuration, when a rare short circuit occurs in the wire harness, the temperature fuse rises with a delay from the temperature rise change of the fusible link and blows before reaching the fusing temperature of the fusible link. Become like

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

(1) First Embodiment In FIG. 1, reference numeral 20 denotes a vehicle alarm device as a whole, in which a linear thermistor 22 is arranged so as to be wound around a wire harness 21 installed in the vehicle. It is made to establish. Both ends of the linear thermistor 22 are connected to an abnormality determination circuit 23 and a self-diagnosis circuit 25.

The vehicle alarm device 20 has an environmental temperature measuring thermistor 24 for measuring the ambient temperature around which the wire harness 21 is routed, and both ends of the environmental temperature measuring thermistor 24 are provided at both ends. And a self-diagnosis circuit 25.

An abnormality determination circuit 23 determines whether or not an abnormality has occurred in the wire harness 21 based on the temperature detection output obtained by the linear thermistor 22 and the temperature detection output obtained by the environmental temperature measuring thermistor 24. If an abnormality has occurred, the alarm unit 26 is driven to notify the user that an abnormality has occurred in the wire harness 21.

In this embodiment, the linear thermistor 22 is connected to the wire harness 21 in the engine or the wire harness near the driver's seat where the rare short circuit is likely to occur, among the many wire harnesses 21 in the vehicle. It is made to wind.

Here, in the vehicle alarm device 20, when a rare short circuit occurs in the wire harness 21, the temperature of the wire harness 21 rises to a certain temperature, and at this time, the temperature of the linear thermistor 22 also rises. Therefore, a temperature detection output corresponding to a rise in the temperature of the wire harness 21 is input from the linear thermistor 22 to the abnormality determination circuit 23. Thereby, the abnormality of the wire harness 21 can be detected based on the temperature detection output.

In the vehicular alarm device 20, the abnormality determination circuit 23 inputs the temperature detection output from the environmental temperature measurement thermistor 24 in addition to the temperature detection output from the linear thermistor 22. Is corrected by the temperature detection output obtained by the environmental temperature measurement thermistor 24. Thereby, in the vehicle alarm device 20, the abnormality of the wire harness 21 can be detected based only on the temperature change of the wire harness 21.
Can be more accurately detected.

The self-diagnosis circuit 25 detects disconnection or short-circuit of the linear thermistor and the thermistor for measuring environmental temperature, and displays the detection result on the display unit 27. Accordingly, in the vehicle alarm device 20, if the linear thermistor 22 and the ambient temperature measurement thermistor 24 are disconnected or short-circuited, it is known in advance that the normal abnormality detection is not currently performed. By doing so, the reliability of abnormality detection can be improved.

As shown in FIG. 2, the linear thermistor 22 and the thermistor 24 for measuring the environmental temperature penetrate the linear thermistor element 30 made of an NTC or PTC type plastic thermistor and the center of the thermistor element 30. Is provided over the length direction of the thermistor element 30,
Internal conductor 31 for applying a predetermined voltage to thermistor element 30
And a reticulated sheath conductor 32 covering the thermistor element 30 and applying a predetermined voltage, and an insulating film 33 covering the sheath conductor 32. A predetermined voltage is applied to the inner conductor 31 and the outer conductor 32 from the abnormality determination circuit 23. Thereby, the thermistor element 3
The strength of the internal conductor 31 can be reinforced by the strength of 0, and a voltage can be easily applied to the thermistor element 30.

Next, FIG. 3 is a circuit diagram showing a state of electrical connection of the linear thermistor 22, the thermistor for measuring environmental temperature 24, the abnormality determination circuit 23, and the alarm unit 26. The abnormality determination circuit 23 stabilizes the power supply voltage of 12 [V] input to the terminal T0 to a predetermined voltage value by the Zener diode D1 and removes noise by the electrolytic capacitor C1, and then removes the linear thermistor 22 and the environment. It is input to a bridge circuit composed of a temperature measurement thermistor 24, a resistor R1, a resistor R2 and a variable resistor R3.

Here, as shown in FIG.
2 thermistor element 30A and the thermistor element 30A
And the internal conductor 31A of the environmental temperature measuring thermistor 24 and the internal conductor applying a voltage to the thermistor element 30B. 31B is electrically connected in parallel with each other. The variable resistor R3 is provided for adjusting the balance of the bridge circuit.

As a result, the bridge circuit outputs a difference voltage between the temperature detection output of the linear thermistor 22 and the temperature detection output of the environmental temperature measuring thermistor 24, that is, a voltage based only on the temperature change of the wire harness 21. .

This differential voltage is amplified by the operational amplifier OP1, integrated by the capacitor C2, and then input to the bases of the transistors Tr1 and Tr2 which are Darlington connected to each other. The other end of the alarm lamp 26 having one end connected to the power input terminal T0 is connected to the collector of the transistor Tr2.

As a result, when the temperature of the wire harness 21 is a normal temperature (ie, when a rare short circuit does not occur in the wire harness 21), the difference voltage output from the bridge circuit is required to operate the transistor Tr1. Since the voltage value is not reached, the alarm lamp 26 is turned off.

On the other hand, when a rare short occurs in the wire harness 21 and the temperature of the wire harness 21 rises, the differential voltage output from the bridge circuit increases accordingly, and the transistor Tr1 turns on. Electric current flows through the alarm lamp 26, and the alarm lamp 26 is turned on.

Thus, the alarm lamp 26 can be effectively turned on only when an abnormality such as a rare short circuit occurs in the wire harness 21, so that the user can be notified of the abnormality of the wire harness 21.

Next, FIG. 4 is a circuit diagram showing the electrical connection between the linear thermistor 22, the thermistor for measuring the ambient temperature 24, the self-diagnosis circuit 25, and the display unit 27. The self-diagnosis circuit 25 applies the power supply voltage of 12 [V] applied to the terminal T10 to the terminal T1 formed at one end of the sheath conductor 32A of the linear thermistor 22 via the zener diode D2 and the electrolytic capacitor C4. And the linear thermistor 2
2 is applied to a terminal T2 formed at one end of the internal conductor 31A.

The terminal T1 is connected to the base of the transistor Tr11. A terminal T4 formed at the other end of the jacket conductor 32A is connected to the base of the transistor Tr12. Further, a terminal T3 formed at the other end of the inner conductor 31A is connected to the outer conductor 32 of the environmental temperature thermistor 24.
A terminal T5 formed at one end of B and a terminal T6 formed at one end of the internal conductor 31B of the environmental temperature thermistor 24 are connected to the base of the transistor Tr13.

The terminal T7 formed at the other end of the internal conductor 31B is grounded, and the terminal T8 formed at the other end of the jacket conductor 32B is connected to the base of the transistor Tr14.

Each transistor Tr11, Tr12, Tr
13 and Tr14 each have a collector pulled up to a predetermined voltage value and a collector connected to the inverter 4
1, 42, 43 and 44 are connected to the input terminals. The output of the inverter 41 is input to a logical negation circuit 45 and a logical negation circuit 46, the output of the inverter 42 is input to a logical negation circuit 46, and the output of the inverter 43 is a logical negation circuit 45 and a logical negation circuit 47. , And the output of the inverter 44 is input to the AND circuit 47.

The output terminal of the AND circuit 45 is connected to the amplifier 51.
, One end is connected to the other end of the short-circuit indicator lamp 27A connected to the power supply terminal T11. The output of the AND circuit 46 is input to the AND circuit 50 via the inverter 48, and the output of the AND circuit 47 is input to the AND circuit 50 via the inverter 49. An output terminal of the logical product negation circuit 50 is connected via an amplifier 52 to one end of a disconnection indication lamp 27B having one end connected to the power supply terminal T12.

Thus, in the self-diagnosis circuit 25, when only the voltage values of the outer conductors 32A and 32B decrease, the linear thermistor 22 or the thermistor 24 for measuring the ambient temperature is used.
Is diagnosed as short-circuited, and the linear thermistor 22 or the ambient temperature measurement thermistor 24 is disconnected when the voltage values of the inner conductors 31A and 31B and the voltage values of the outer conductors 32A and 32B both decrease. Diagnosis is made.

When both the linear thermistor 22 and the ambient temperature measuring thermistor 24 are normal, both the short-circuit indicating lamp 27A and the disconnection indicating lamp 27B are turned off.

On the other hand, when either the linear thermistor 22 or the thermistor for measuring the environmental temperature 24 is short-circuited, the short-circuit indicator lamp 27A is turned on. If either the linear thermistor 22 or the thermistor for environmental temperature measurement 24 is disconnected,
The disconnection display lamp 27B is turned on.

As a result, when a disconnection or a short circuit occurs in the linear thermistor 22 and the environmental temperature measuring thermistor 24, it is possible to indicate that a normal abnormality is not currently detected. , The reliability of abnormality detection can be improved.

Thus, according to the above configuration, an abnormality detecting device for a vehicle wire harness and a vehicle alarm capable of accurately and easily detecting an abnormality of the wire harness 21 such as a rare short circuit and avoiding further deterioration of the wire harness 21. The device can be realized.

(2) Second Embodiment In FIG. 5, reference numeral 60 denotes a vehicle power supply device as a whole, in which a battery 61 is sequentially connected via a fusible link 62, a relay 63 as a power cutoff means, and a wire harness 64. Connected to the load 65. Thus, in the vehicle power supply device 60, when the operation switch 66 is turned on, the control coil 63A of the relay 63 is energized, and the relay 63 is turned on, so that battery power is supplied to the load 65. .

In addition to the above configuration, in the vehicle power supply device 60, a thermal fuse 67 is provided adjacent to the fusible link. One end of the thermal fuse 67 is connected to the battery 61 and the other end is connected to the control coil 63A. Thereby, the thermal fuse 6
When the fuse 7 is blown, the relay 63 is turned off.

Here, the fusing characteristic of the thermal fuse 67 is selected to be lower than the fusing curve L1 of the fusible link 62 as shown by the curve L3 in FIG. As a result, in the vehicle power supply device 60, even if the fusible link 62 does not melt without the temperature of the fusible link 62 increasing even though the wire harness 64 has a rare short circuit, When the fuse 67 is effectively blown, further deterioration of the wire harness 64 due to a rare short which cannot be prevented by blowing the fusible link 62 can be prevented.

Incidentally, a curve L2 in FIG. 6 shows a temperature characteristic of the wire harness 64 at the time of rare short.

[0062]

According to the first aspect of the present invention, a linear thermistor is wound around a wire harness routed in a vehicle or adjacent to the wire harness. A vehicle wire that is disposed and detects an abnormality of a wire harness based on a temperature detection output obtained by the linear thermistor, thereby accurately and easily detecting an abnormality based on a rare short circuit or the like of the wire harness. A harness abnormality detecting device can be realized.

According to the second aspect of the present invention, the linear thermistor of the first aspect is connected to a linear thermistor element so as to penetrate the center of the thermistor element or to be wound around the thermistor. A conductor provided over the length direction of the thermistor element and configured to apply a predetermined voltage to the thermistor element enables the strength of the thermistor element to be reinforced by the strength of the conductor, and the voltage to be easily applied to the thermistor element. Can be applied

According to a third aspect of the present invention, in the first or second aspect, the thermistor for measuring an environmental temperature around the wire harness is arranged, and the thermistor for measuring the environmental temperature. The provision of the abnormality detection circuit for detecting an abnormality of the wire harness based on the temperature detection output obtained by the thermistor and the temperature detection output obtained by the linear thermistor allows the abnormality of the wire harness to be detected more accurately. An abnormality detection device for a vehicle wire harness can be realized.

According to a fourth aspect of the present invention, in the third aspect, the linear thermistor and the thermistor for measuring environmental temperature are connected to each other so as to form a bridge circuit, and the abnormality determination circuit is connected to the bridge. By detecting the abnormality of the wire harness based on the output of the circuit, the difference between the temperature detection output of the linear thermistor and the temperature detection output of the thermistor for environmental temperature measurement can be obtained by a simple circuit configuration. An output based on only the temperature change of the harness can be obtained.

According to the fifth aspect of the present invention, in addition to the constitutions of the first to third and fourth aspects, a self-diagnosis circuit for detecting disconnection or short circuit of the linear thermistor is provided. As a result, it is possible to realize a vehicle wire harness abnormality detection device with further improved abnormality detection reliability.

According to a sixth aspect of the present invention, in addition to the configuration of the third or fourth aspect, a self-diagnosis circuit for detecting a disconnection or a short circuit of the linear thermistor and the thermistor for measuring environmental temperature is provided. By doing so, it is possible to realize a vehicle wire harness abnormality detection device with further improved abnormality detection reliability.

According to a seventh aspect of the present invention, in the fifth aspect, the linear thermistor includes a linear thermistor element and a lengthwise direction of the thermistor element passing through the center of the thermistor element. An internal conductor that applies a predetermined voltage to the thermistor element, and a jacket conductor that covers the thermistor element and to which a predetermined voltage is applied. When the voltage drops, the linear thermistor is diagnosed as short-circuited, and when both the voltage value of the inner conductor and the voltage value of the outer conductor decrease, it is diagnosed that the linear thermistor is broken. As a result, a self-diagnosis of whether the linear thermistor is disconnected or short-circuited can be reliably performed, and the reliability of abnormality detection has been further improved. The abnormality detection device can be realized.

According to an eighth aspect of the present invention, there is provided the vehicle wire harness abnormality detecting device according to any one of the first to sixth and seventh aspects, and when an abnormality is detected by the abnormality detecting device. And warning means for warning that there is an abnormality in the wiring harness, so that the user can know that an abnormality such as a rare short has occurred in the wiring harness based on the warning by the warning means. Become like

According to the ninth aspect of the present invention, in a vehicle power supply device adapted to supply battery power to a load via a fusible link and a wire harness in sequence, a vehicle power supply device is provided adjacent to the fusible link. The temperature fuse of the fusible link is blown when the temperature of the fusible link becomes equal to or higher than a predetermined value, and the power cutoff means for cutting off the supply of battery power to the wire harness when the temperature fuse blows is provided. , Despite a rare short circuit in the wire harness
Even in the case where the fusible link does not blow without the temperature of the fusible link rising, the effective melting of the thermal fuse further increases the wire harness due to a rare short which cannot be prevented by the fusible link blowing. Deterioration can be prevented beforehand.

Further, according to the tenth aspect of the present invention,
By setting the fusing temperature characteristics of the thermal fuse to be lower than the fusing temperature of the fusible link, if a rare short circuit occurs in the wire harness, the thermal fuse will blow before reaching the fusing temperature of the fusible link. Therefore, further deterioration of the wire harness at the time of rare short which cannot be prevented by the fusible link can be surely prevented.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a vehicle wire harness abnormality detection device and a vehicle alarm device according to the present invention.

FIG. 2 is a schematic perspective view showing a configuration of a linear thermistor and an environmental temperature measuring thermistor.

FIG. 3 is a linear thermistor, a thermistor for measuring environmental temperature,
FIG. 4 is a connection diagram illustrating a state of electrical connection between an abnormality determination circuit and an alarm unit.

FIG. 4 shows a linear thermistor, a thermistor for measuring environmental temperature,
FIG. 4 is a connection diagram illustrating a state of electrical connection between a self-diagnosis circuit and a display unit.

FIG. 5 is a connection diagram illustrating a configuration of a vehicle power supply device according to the present invention.

FIG. 6 is a characteristic curve diagram for explaining the fusing characteristics of the thermal fuse.

FIG. 7 is a perspective view showing a configuration of a wire harness.

FIG. 8 is a connection diagram illustrating a configuration of a conventional wire harness abnormality detection device.

[Explanation of symbols]

 Reference Signs List 20 vehicle alarm device 21, 64 wire harness 22 linear thermistor 23 abnormality determination circuit 24 environmental temperature measurement thermistor 25 self-diagnosis circuit 26 alarm unit (alarm lamp) 30 thermistor element 31 internal conductor 32 outer conductor 61 battery 62 fusible Link 63 Power cut-off means (relay) 67 Thermal fuse

Claims (10)

[Claims] A linear thermistor is provided so as to be wound around or adjacent to a wire harness routed in a vehicle, and a temperature detection output obtained by the linear thermistor is provided. An abnormality detecting device for a wire harness for a vehicle, wherein an abnormality of the wire harness is detected based on the abnormality. 2. The linear thermistor is provided in a length direction of the thermistor element so as to penetrate a center of the thermistor element or to be wound around the thermistor element, 2. The vehicle wire harness abnormality detecting device according to claim 1, further comprising a conductor for applying a predetermined voltage to the thermistor element. 3. An abnormality detecting device for a wire harness for a vehicle, the device comprising: an environmental temperature measuring thermistor for measuring an ambient temperature around the wiring harness; and a temperature detection output obtained by the environmental temperature measuring thermistor. 3. The vehicle wire harness according to claim 1, further comprising: an abnormality determination circuit configured to detect an abnormality of the wire harness based on a temperature detection output obtained by the linear thermistor. 4. Anomaly detection device. 4. The linear thermistor and the ambient temperature measuring thermistor are connected to each other to form a bridge circuit, and the abnormality determination circuit determines an abnormality of the wire harness based on an output of the bridge circuit. The abnormality detecting device for a wire harness for a vehicle according to claim 3, wherein the abnormality is detected. 5. A self-diagnosis circuit for detecting disconnection or short circuit of the linear thermistor.
The abnormality detecting device for a wire harness for a vehicle according to any one of claims 3 to 4. 6. The vehicle wiring harness according to claim 3, further comprising a self-diagnosis circuit for detecting disconnection or short circuit of the linear thermistor and the environmental temperature measuring thermistor. Anomaly detection device. 7. The linear thermistor is provided along a length direction of the thermistor element so as to penetrate a center of the linear thermistor element, and applies a predetermined voltage to the thermistor element. An internal conductor, and a jacket conductor that covers the thermistor element and to which a predetermined voltage is applied, wherein the self-diagnosis circuit short-circuits the linear thermistor when only the voltage value of the jacket conductor decreases. 6. A diagnosis that the linear thermistor is disconnected when the voltage value of the inner conductor and the voltage value of the outer conductor both decrease. Abnormality detection device for vehicle wire harness. 8. A vehicle wire harness abnormality detecting device according to claim 1, wherein when the abnormality detecting device detects an abnormality, the abnormality is detected in the wire harness. An alarm device for a vehicle, comprising alarm means for issuing an alarm. 9. A vehicular power supply device adapted to supply battery power to a load via a fusible link and a wire harness in sequence, provided adjacent to the fusible link, and provided with a temperature of the fusible link. Power supply for a vehicle, comprising: a thermal fuse that is blown when the temperature becomes equal to or more than a predetermined value; and a power cutoff unit that cuts off supply of the battery power to the wire harness when the thermal fuse is blown. apparatus. 10. The fusing temperature characteristic of the thermal fuse is as follows:
The power supply apparatus for a vehicle according to claim 9, wherein the power supply is selected to be lower than a fusing temperature of the fusible link.