JP3346463B2 - Vehicle power line and vehicle power line abnormality detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply line for a vehicle and a device for detecting an abnormality of the power supply line for a vehicle, and more particularly to the occurrence of an abnormality such as a complete short circuit (dead short circuit) or an intermittent short circuit (rare short circuit). It is suitable to be applied to the case where is detected.

[0002]

2. Description of the Related Art Conventionally, in a vehicle, power is generally supplied from a power supply unit such as a battery or an alternator to each load via a power supply line called a wire harness. In general, this wire harness has a configuration in which a plurality of conductive wires are covered with an insulating coating layer such as polyvinyl chloride, respectively, and these are further bundled with a vinyl tape or the like.

[0003] Here, among the conductive wires, those which are connected to a load which particularly requires a large current are connected to a fusible link, so that when the voltage of a power supply section such as a battery or an alternator fluctuates, or when the conductive wires are changed. Damage of each load and deterioration of the wire harness due to an excessive current generated at the time of dead short can be prevented.

[0004] In a vehicle, a conductive wire may come into contact with a body due to deterioration of an insulating coating layer over time, contact with a vehicle edge portion, wear, or the like, resulting in a so-called dead short or rare short state. At this time, there is no problem if the fusible link is blown and the current of the conductive wire is interrupted, but the fusible link is not always blown depending on the fusing characteristics of the fusible link. In such a case, as a result of the heat generated by the insulating coating layer, the insulating coating layer may be further deteriorated.

Conventionally, as shown in Japanese Patent Application Laid-Open No. 61-139216, a current waveform flowing through a wire harness is detected, and based on this current waveform, the presence or absence of a dead short or a rare short in the wire harness is determined. A device that issues an alarm when a dead short or a rare short has occurred in a wire harness has been proposed.

That is, in the publication, a current sensor provided on a wire harness connecting a battery and a load detects a current value flowing through the wire harness, differentiates the current value with a current change detection circuit, and digitizes the current value. A circuit that sends the signal to a waveform identification circuit via a circuit is disclosed. Based on the output of the digitizing circuit, the waveform discriminating circuit discriminates the current flowing through the wire harness into four levels, that is, whether the current is caused by a normal load on / off, a dead short, or a rare short. And if it was a dead short or rare short,
The breaker is turned off and an alarm is issued from the alarm device to indicate that the wire harness is damaged.

[0007]

However, according to the prior art disclosed in the above-mentioned publication, an alarm is issued only when a dead short or a rare short occurs, so that any abnormalities occur before the dead short or the like. There is a demand to detect and report the abnormality to improve safety. In addition, since the current value must be detected for each conductive wire constituting the wire harness, the number of components such as a current sensor becomes very large, and there is a problem that the cost increases.

Further, in order to detect an abnormality caused by damage to the wire harness by detecting a current flowing through the wire harness, factors other than the damage, such as variations in load current, temperature, and remaining battery power, are considered. A detection process must be performed in consideration of a current value that changes accordingly. As a result, the process of detecting an abnormality in the power supply line becomes complicated, and the configuration therefor also becomes complicated, resulting in an increase in cost.

The present invention has been made in consideration of the above points, and detects and reports an abnormality at a stage before a dead short or the like, improves safety, and has a simple configuration. It is an object of the present invention to provide a vehicle power supply line and a vehicle electric wire line abnormality detection device capable of reducing cost and detecting a main power supply line abnormality such as dead short with high reliability.

[0010]

According to a first aspect of the present invention, a power supply unit such as a battery or an alternator and a power supply target such as a load are connected to each other. in the vehicle power supply line 20 for supplying a current from the power supply unit to the power supply target, said power supply
A conductive line for electrically connecting the unit and the power supply target;
Power supply line having an electrical insulator covering the conductive line
21 and an abnormality detection electric wire 31;
31 is the first conductor 132, the second conductor 232 and the temperature
Temperature resistor 34 whose resistance value changes in accordance with a change in degree
Having the between the first conductor and the second conductor
A three-layer body 32 having a temperature resistor interposed therein;
Formed into a slender flat plate overall with the insulating coating 35 to cover
In the formed state, the longitudinal direction of the elongated plate shape is
Wrap around main power line to match longitudinal direction of main power line
And formed in a tubular shape, the first conductor and
The resistance value between the second conductor is reduced by the
When it detects that the temperature of the main power supply line has exceeded a predetermined temperature,
And the potential between the first conductor and the second conductor is equal.
Contact with the body of the vehicle
A vehicle power supply line 20 characterized in that each of them is detected .

According to the first aspect of the present invention, the abnormality detecting electric wire is provided.
31 is formed in a slender plate shape as a whole,
The longitudinal direction of the elongated flat plate matches the longitudinal direction of the main power line
So that it is wound around the main power line and formed into a tubular shape.
So that the abnormality detection electric wire 31
Winding can be easily performed .

In such an abnormality detecting wire 31, by detecting the resistance value of the temperature resistor 34, the temperature abnormality of the main power line 21 can be detected, and the conductive line 2 of the main power line 21 can be detected.
An abnormality can be detected even before the circuit 2 is short-circuited. Further, if there is a short circuit in the temperature resistor 34, the short circuit abnormality can be detected.

That is, when the abnormal temperature is detected by the temperature resistor 34 and the short circuit of the temperature resistor 34 is detected, a dead short or a rare short may have occurred in the main power supply line 21 itself. Means higher.
On the other hand, when the abnormal temperature is detected by the temperature resistor 34 and the short-circuit abnormality of the temperature resistor 34 is not detected, an overcurrent occurs in the main power supply line 21 due to a load short-circuit caused by a load failure. It means that it is likely to be flowing.

As described above, it is possible to specify where the cause of the overcurrent is based on the detection result of both the temperature abnormality by the temperature resistor 34 and the short circuit abnormality of the temperature resistor 34. it can. As a result, if the specified abnormal part is replaced or repaired, the cause of the overcurrent can be easily removed.

According to a second aspect of the present invention, the first conductor 132 and the second conductor 232 are each formed in a mesh plate shape. 20.

According to the second aspect of the present invention, the tube-shaped abnormality detection electric wire 31 is wound around the main power supply line 21, and the main power supply line 21 is a net-shaped first conductor 132 constituting the abnormality detection electric wire 31. And the second conductor 232, the first conductor 132 and the second conductor 232 are connected to each other by electric field noise generated from an alternator or the like or by C for vehicle control.
Magnetic field noise generated from the PU or the like can be absorbed to prevent each noise from propagating to the main power supply line 21.

According to a third aspect of the present invention, the first conductor 132 and the second conductor 232 are provided with a drain wire 3
6. The device according to claim 1, wherein each of said plurality is connected.
Or the vehicle power supply line 20 according to 2.

According to the third aspect of the present invention, the abnormality detecting wire 31 in which the three-layer body 32 is covered with the insulating film 35 is manufactured continuously, and the continuous abnormality detecting wire 31 is wound around the main power supply. If the drain wires 36 are connected to the ends of the first conductor 132 and the second conductor 232 of the cut abnormality detection electric wire 31 respectively, various main power supply lines 21 The various abnormality detection wires 31 according to the length can be easily manufactured.

According to a fourth aspect of the present invention, the insulating film 3
5 has a pair of film bodies 135 and 235. The pair of film bodies 135 and 235 respectively cover both surfaces of the three-layer body 32, and each of the film bodies 135 and 235.
The vehicle power line (20) according to claim 1, 2 or 3, wherein the side edges (35) are bonded to each other.

According to the fourth aspect of the present invention, the first conductor 132, the second conductor 232, and the temperature resistor 34 constituting the three-layer body 32 are continuously manufactured, and these are formed into the three-layer body 32. The three-layer body 3
If both side edges of the pair of film bodies 135 and 235 are adhered to each other while covering both surfaces of the two with the pair of film bodies 135 and 235, respectively,
Can be manufactured continuously.

[0021] The invention according to claim 5 is the invention according to claims 1 to 4.
Power supply line 2 for detecting an abnormality of the power supply line for a vehicle described in 1
0 abnormal temperature detecting means 41 for detecting that the main power supply line 21 has reached an abnormal temperature based on the temperature detection output obtained by the temperature resistor 34.
A short-circuit detecting means 45 for detecting a short-circuit of the temperature resistor 34; and a temperature abnormality detected by the abnormal temperature detecting means 41 and a short-circuit abnormality detected by the short-circuit detecting means 45, respectively. Notification means 4
4. An abnormality detection device 40 for a vehicle power supply line, comprising:

According to the fifth aspect of the present invention, when the insulating coating 35 serving as the coating of the abnormality detecting wire 31 is damaged by an edge of the vehicle body and the temperature resistor 34 is short-circuited, the short-circuit detecting means 45 detects the short-circuit. The notification means 44 notifies the short circuit.

When a short-circuit abnormality is detected by the short-circuit detection means 45 and a temperature abnormality of the main power supply line 21 is detected by the abnormal temperature detection means 41, a dead short or a rare short occurs in the main power supply line 21 itself. Means that it is likely to be

On the other hand, if the short-circuit abnormality is not detected by the short-circuit detection means 45 and the abnormal temperature detection means 41
When the temperature abnormality of the main power supply line 21 is detected by the
Means that there is a high possibility that an overcurrent is flowing through

As described above, it is possible to specify where the cause of the overcurrent is based on the detection results of both the temperature abnormality detecting means 41 and the short-circuit detecting means 45. As a result, if the specified abnormal part is replaced or repaired, the cause of the overcurrent can be easily removed.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. FIG. 1 is a perspective view showing an abnormality detection wire according to an embodiment of the present invention, partially broken away. FIG.
FIG. 3 is a perspective view of the abnormality detection electric wire. FIG. 3 is a partial sectional view of the abnormality detection electric wire. FIG.
It is a block diagram of the abnormality detection apparatus of the vehicle power supply line.

As shown in FIG. 4, the vehicle power supply line 20 has a plurality of main power supply lines 21, and each main power supply line 21
2 and an electrical insulator 23 covering the conductive wire 22. One end of the main power supply line 21 is connected to the power supply box 10. The other end of the main power supply line 21 is connected to a corresponding load (not shown). Here, the power supply box 10 is connected to a power supply unit such as a battery and an alternator by a power supply line (not shown), and distributes power of the power supply unit to each main power supply line 21.

Further, as shown in FIG.
At 0, a plurality of main power supply lines 21 are fitted and converged by an abnormality detection electric wire 31 formed in a tubular shape.

As shown in FIG. 1 to FIG.
1 has a three-layer body 32 and an insulating film 35. The three-layer body 32 has a first conductor 132, a second conductor 232, and a temperature resistor 34. The first conductor 132 and the second conductor 232 are formed in a net plate shape, and a temperature resistor formed by forming an insulating material in a flat plate shape between the first conductor 132 and the second conductor 232. 34 are interposed.
The temperature resistor 34 changes its resistance value in accordance with a temperature change. In the case of the present embodiment, the temperature resistor 34 is an NTC (negative temperat).
ure coefficient) type or PTC (positive temp)
erature coefficient) type plastic thermistor is used.

As shown in FIG. 1, FIG. 2 and FIG. 4, the first conductor 132 and the second conductor
Numerals 2 are connected to connectors via drain wires 36, respectively. The connector is provided with an abnormal temperature detecting means 41 described later.
And short-circuit detecting means 45.

The abnormality detecting device 40 includes an abnormal temperature detecting means 4.
1, a power cutoff unit 43, a notification unit 44, and a short circuit detection unit 45. Abnormal temperature detecting means 41;
The short-circuit detecting means 45 has a relay (not shown). The notification means 44 has a temperature abnormality display lamp and a short-circuit abnormality display lamp, and is turned on when each abnormality occurs.

The abnormal temperature detecting means 41 has a bridge circuit and a comparator (both not shown). The bridge circuit includes a temperature resistor 34 and has a pair of resistors and a variable resistor. The comparator compares the two outputs from the bridge circuit to detect whether or not the temperature of the main power supply line 21 has exceeded the abnormal temperature (200 ° C.) near the smoke temperature.

The abnormal temperature detecting means 41 is configured to, when detecting an abnormal temperature of the main power supply line 21, energize the coil of the relay, close the contact of the relay, and energize the abnormal temperature indicating lamp of the notification means 44. ing. The abnormal temperature can be easily set to a desired temperature by appropriately selecting a variable resistance value of the bridge circuit.

Similarly, when the short-circuit detecting means 45 detects a short-circuit of the temperature resistor 34, the coil of the relay is energized, the contact of the relay is closed, and the short-circuit abnormality indicating lamp of the alarm means 44 is energized. ing.

The power cutoff means 43 is connected to the temperature resistor 34.
The power supply is automatically cut off when an overcurrent flows due to a short circuit. The power cutoff means 43 may be a fuse that is blown by an overcurrent and cuts off the power.

In order to manufacture the abnormality detecting wire 31, first,
The first conductor 132 and the second conductor 2 constituting the three-layer body 32
32 and the temperature resistor 34 are manufactured continuously. Further, a pair of film bodies 1 to be the insulating coating 35
Similarly, 35 and 235 are continuously manufactured.

Next, the first conductor 132 and the second conductor 23
2 and the temperature resistor 34 are superimposed on three layers to continuously manufacture the three-layer body 32, and a pair of film bodies 135 and 235 are coated on both surfaces of the continuous three-layer body 32. The side edges of the film bodies 135 and 235 are bonded to each other. Thereby, the abnormality detection electric wire 31 can be manufactured continuously.

Abnormality detecting electric wire 3 manufactured continuously as described above
In order to wind the wire 1 around the main power line 21, the abnormality detection wire 31 is cut in accordance with the length of the main power line 21 to be wound, and the first conductor 13 of the cut abnormality detection wire 31 is cut.
If the drain wires 36 are connected to the ends of the second and second conductors 232, respectively, various abnormality detection electric wires 31 corresponding to the lengths of various main power supply lines 21 can be easily manufactured.

The wire is cut into a suitable length, and as shown in FIG.
When the main power line is
Wrapped around the main power line to match the longitudinal direction of the
Since it is formed in a tubular shape , the abnormality detection electric wire 31 can be easily wound around the main power supply line 21.

In the above configuration, when an overcurrent flows through the main power supply line 21 due to a continuous short circuit such as a load failure or a short circuit of the main power supply line 21, the temperature of the electrical insulator 23 of the main power supply line 21 increases. At this time, the temperature of the temperature resistor 34 also increases accordingly, and when the temperature reaches an abnormal temperature (200 ° C.) near the smoke temperature of the main power supply line 21, the coil of the relay of the abnormal temperature detecting means 41 is energized. Then, the contact of the relay is closed and the temperature abnormality display lamp of the notification means 44 is energized, and the temperature abnormality display lamp is turned on. At this time, a warning buzzer may be sounded to call attention.

The insulation coating 35 of the abnormality detecting wire 31 is worn by contact with the vehicle edge and the like, the vehicle body edge reaches the temperature resistor 34, the temperature resistor 34 contacts the body, and the temperature resistor 34 is short-circuited. In this state, the coil of the relay of the short-circuit detection means 45 is energized, the contact of the relay is closed, the short-circuit abnormality indicator lamp of the notification means 44 is energized, and the short-circuit abnormality indicator lamp is turned on. Further, the power is cut off by the power cut-off means 43. At this time, similarly, a warning buzzer for calling attention may be sounded.

Thus, in the abnormality detecting device 40,
If the short-circuit abnormality display lamp of the notification unit 44 does not light up and the temperature abnormality display lamp of the notification unit 44 lights up,
Main power supply line 21 and no abnormality in the abnormality detection wire 31 can be a possibility that overcurrent flows to the main power supply line 21 by a load short due to failure of the load is high the Most determined.

On the other hand, in the abnormality detecting device 40, the short-circuit abnormality indicating lamp of the notification means 44 is turned on, and the notification means 44 is turned on.
When the temperature abnormality indicator lamp of the lamp lights up, the abnormality detection wire 31 is damaged and the temperature resistor 3
4 is in a short-circuit state, the current state is a stage before the biting of the vehicle edge reaches the main power supply line 21, and a dead short or a rare short occurs due to the biting of the vehicle edge in the main power supply line 21. The user or the like can know in advance what the deafness is.

In addition to detecting the temperature rise of the main power supply line 21, the presence or absence of the short circuit of the temperature resistor 34 is detected. (Main power supply line 21 or abnormality detection electric wire 31 or load) can be specified. As a result, the user can easily eliminate the overcurrent by replacing or repairing the specified abnormal component.

The abnormality detecting electric wire 31 is wound around the main power supply line 21, and the first conductor 132 and the second conductor 232 constituting the upper layer and the lower layer of the three-layer body 32 of the abnormality detecting electric wire 31 are formed by a mesh plate. Since the first conductor 132 and the second conductor 232 are formed in the respective shapes, the first conductor 132 and the second conductor 232 may generate electric field noise generated from an alternator or the like or a vehicle control CP.
By absorbing magnetic field noise generated from U and the like, it is possible to prevent each noise from propagating to the main power supply line 21.

In the above-described embodiment, the case where the vehicle power line abnormality detecting device 40 is formed by the circuit configuration shown in FIG. 4 has been described. However, the vehicle power line abnormality detecting device 40 of the present invention is described. The present invention is not limited to this. The point is that the abnormal temperature detecting means 41 detects that the main power supply line 21 has reached an abnormal temperature (for example, 200 ° C.) near the smoke temperature based on the temperature detection output obtained by the temperature resistor 34. And short-circuit detecting means 45 for detecting that the temperature resistor 34 is short-circuited.
And a notifying unit 44 for notifying the user that each abnormal condition has been detected by the abnormal temperature detecting unit 41 or the short-circuit detecting unit 45.

[0047]

As described above, according to one embodiment of the present invention, the abnormality detecting electric wire 31 is formed in an elongated flat plate shape as a whole.
When the main power line is
Wrapped around the main power line to match the longitudinal direction of the
Since it is formed in a tubular shape, the main power line of the abnormality detection wire
Can be easily wound. Also,
When the temperature of the main power supply line rises and becomes an abnormal temperature near the smoke temperature, the temperature abnormality of the main power supply line can be detected by detecting the resistance value of the temperature resistor. Further, when the insulating film of the abnormality detecting wire is damaged by the edge of the vehicle body or the like and the temperature resistor is short-circuited, the short-circuit detecting means can detect the short circuit. In other words, if there is a short circuit in the temperature resistor and the abnormal temperature detecting means detects an abnormal temperature in the main power supply line, it is highly likely that a dead short or a rare short has occurred in the main power supply line itself. means. On the other hand, if there is no short circuit of the temperature resistor and the abnormal temperature detecting means detects an abnormal temperature of the main power line, an overcurrent flows through the main power line due to a load short due to a load failure. Means that it is likely to be. As described above, it is possible to specify where the cause of the overcurrent is flowing based on the detection results of both the temperature abnormality detecting means and the short-circuit detecting means, and to easily remove the cause of the overcurrent. be able to.

Further, according to another configuration of the present invention, a tube-shaped abnormality detection electric wire is wound around the main power supply line, and the main power supply line has a mesh plate-shaped first conductor and a second conductor which constitute the abnormality detection electric wire. Since it is covered by the two conductors, the electric field noise generated from the alternator and the like and the magnetic field noise generated from the vehicle control CPU and the like can be absorbed to prevent each noise from propagating to the main power supply line. .

Further, according to another configuration of the present invention, an abnormality detecting wire in which the three-layer body is covered with an insulating film is continuously manufactured, and the continuous abnormality detecting wire is wound on the main power supply line to be wound. If the drain wire is connected to the end of the first conductor and the second conductor of the cut abnormality detection electric wire, various types of wires corresponding to the lengths of various main power lines can be obtained. Can be easily manufactured.

Further, according to another configuration of the present invention, the first conductor, the second conductor, and the temperature resistor constituting the three-layer body are continuously manufactured, and these are formed into a three-layer body. If the side edges of the pair of film bodies are adhered to each other while covering both surfaces of the three-layer body with the pair of film bodies respectively while feeding in the longitudinal direction, it is possible to continuously manufacture abnormality detection wires. Becomes possible.

Further, according to another configuration of the present invention, when the insulation film of the abnormality detecting wire is damaged by the edge of the vehicle body or the like and the temperature resistor is short-circuited, the short-circuit detection means detects the short circuit. Then, the notifying means starts notifying. If there is a short circuit in the temperature resistor and the abnormal temperature detecting means detects a temperature abnormality in the main power supply line, it means that there is a high possibility that a dead short or a rare short has occurred in the main power supply line itself. . On the other hand, if there is no short circuit of the temperature resistor and the abnormal temperature detecting means detects an abnormal temperature of the main power line, an overcurrent flows through the main power line due to a load short due to a load failure. Means that it is likely to be. As described above, it is possible to specify where the cause of the overcurrent is flowing based on the detection results of both the temperature abnormality detecting means and the short-circuit detecting means, and to easily remove the cause of the overcurrent. be able to.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an abnormality detection wire according to an embodiment of the present invention.

FIG. 2 is a perspective view of an abnormality detection wire according to an embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of an abnormality detection wire according to an embodiment of the present invention.

FIG. 4 is a block diagram of a vehicle power line abnormality detection device according to an embodiment of the present invention.

FIG. 5 is a perspective view illustrating a mounting mode in which the abnormality detection electric wire of FIG. 1 is wound around a main power supply line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Power supply box 20 ... Vehicle power supply line 21 ... Main power supply line 23 ... Electrical insulator 31 ... Abnormality detection electric wire 32 ... Trilayer body 132 ... First conductor 232 ... Second conductor 34 ... Temperature resistor 35 ... Insulating coating 135, 235 Film film 36 Drain wire 40 Abnormality detecting device 41 Abnormal temperature detecting means 43 Power supply shutoff means 44 Notifying means 45 Short circuit detecting means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-8-264035 (JP, A) JP-A-6-128554 (JP, A) JP-A-56-89034 (JP, A) JP-A-11- 64423 (JP, A) JP-A-9-261845 (JP, A) JP-A-1-102776 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01R 31/02

Claims (5)

(57) [Claims] [Claim 1] and connecting the power supply unit such as a battery or alternator and the power supply target such as a load to each other, in the vehicle power supply line for supplying a current from the power supply unit to the power supply target, the said power supply unit An electrical connection to the power supply
Having an electrical insulator covering the electric wire and the conductive wire
A main power supply line and an abnormality detection wire, wherein the abnormality detection wire includes a first conductor, a second conductor, and a temperature detector.
Temperature resistor whose resistance value changes according to
And the temperature between the first conductor and the second conductor.
A three-layer body having a resistor interposed and covering the three-layer body
Formed into a slender flat plate overall with the insulating coating
In the longitudinal direction of the main power supply line length of the flat shape of the elongate
Tubular wound around main power line to match hand direction
And the resistance between the first conductor and the second conductor decreases.
That the temperature of the main power supply line reached a predetermined temperature or higher.
And the first conductor and the second conductor
The body of the vehicle has become
A power supply line for a vehicle, wherein the power supply line detects a contact with the vehicle. 2. The vehicle power line according to claim 1, wherein the first conductor and the second conductor are each formed in a mesh plate shape. To wherein said first conductor and the second conductive body,
The vehicle power supply line according to claim 1, wherein the drain wires are connected to each other. 4. The insulating film has a pair of film bodies, and the pair of film bodies respectively cover both surfaces of the three-layer body, and the side edges of each film body are adhered to each other. The vehicle power supply line according to claim 1, 2 or 3, wherein: 5. The vehicle power line abnormality detecting device according to claim 1, wherein the main power line is configured to detect an abnormality in the vehicle power line based on a temperature detection output obtained by the temperature resistor. Abnormal temperature detecting means for detecting that the temperature is near the fuming temperature; short-circuit detecting means for detecting a short-circuit of the temperature resistor; temperature abnormal by the abnormal temperature detecting means; and short-circuit abnormal by the short-circuit detecting means. And a notifying unit for notifying each of the abnormalities when the abnormality occurs.