JP2000016199A - Electric power feeding device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely detect the short-circuit accident of an actuator by constituting wire harness of an electrical conduction means of which the outer circumferential part containing a line is insulated, an insulating layer formed on the outermost shell of the electrical conduction means, and an electrical conductive layer formed between the conduction means and the insulating layer. SOLUTION: Electric wires 3, 4, 5 are covered with insulated wires on the outer circumference, and they are wrapped with a conductive member 2 for detecting short-circuit made of conductive material. The outside is covered with an insulating member 6, to form wireharness 1. The insulating member 6 has a role bundling them while protecting the conductive member 2 for detecting short-circuit and the wires 3, 4, 5, and in addition prevents the conductive member 2 for detecting short-circuit from shorting to a vehicle body gland. By monitoring output of a comparator, short-circuit of the wireharness 1 to the gland can be detected. Consequently, pull-up resistance functions as a means giving potential to the conductive layer, and the comparator functions as a monitoring means monitoring the potential.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle multiplex communication device.

[0002]

2. Description of the Related Art In recent years, the amount of electric wiring has become enormous because automobiles are equipped with microcomputers and various electric control devices to perform various controls. Therefore, a short circuit accident of one or more power supply lines (hereinafter, wire harness) of an automobile may occur frequently. Therefore, various inventions for detecting a short circuit of an electric wiring such as a wire harness for an automobile have been proposed.

[0003] As one of them, the invention described in Japanese Patent Publication No. 4-17809 is known. According to the present invention, the rated current consumption of each load is calculated in advance, and an abnormal situation such as a short circuit is detected by comparing the current consumption with the current consumption of the entire vehicle.

[0004]

However, in the above-mentioned prior art, the core wire of the power supply line is damaged due to the harness biting when assembling the harness to the vehicle body, or the stripping of the covering caused by the harness coming into contact with the metal part of the vehicle body. When a short circuit occurs to the body ground and an abnormal situation such as a serious accident such as a vehicle fire occurs in the worst case, the entire current of the vehicle is immediately cut off to prevent the accident.
Therefore, for example, if such a state occurs while the vehicle is traveling, the power supply is cut off, and a sudden stop is caused by the cutoff. Further, when the user of the vehicle changes the load of the electric system such as a light bulb, it is necessary to change a preset rating value, which may cause a malfunction.
Further, in the above conventional example, consideration is given to the detection of a short circuit in the wire harness, but no consideration is given to processing after the detection of the short circuit accident.

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation of the related art, and an object of the present invention is to provide an electric wire for an automobile capable of reliably detecting a short circuit accident of an actuator. Another object of the present invention is to provide an in-vehicle multiplex communication device capable of taking appropriate processing when a short circuit accident or the like of a wire harness is detected, thereby preventing a serious accident from occurring. It is in.

[0006]

In order to achieve the above object, a conductor layer is provided on the outer shell of a wire harness, and the outer shell is covered with an insulating layer to form a sub-wire harness as a whole. Preferably, the wire harness of the entire vehicle is configured by connecting the above-described sub-wire harnesses to each other with a connector. More preferably, monitoring means for monitoring the potential of each sub-wire harness to detect a ground short-circuit, control means for determining a short-circuit based on the detection result of the monitoring means, and generating an alarm based on a command from the control means It has an alarm generating means. More preferably, there is provided an interrupting device for interrupting the power supply current according to a command from the control means.

[0007] More preferably, it is configured as follows.
A first specific means is to group a plurality of various control objects mounted on an automobile with those having close arrangement positions, collectively wire the control objects included in each group for each group, and include a group including a battery. In a multiplex communication device in a vehicle for transmitting information by connecting between a processing unit and a wire harness, the wire harness is provided with an electric conduction means in which an outer peripheral portion including a communication line is insulated, and an outermost electric conduction means. It is characterized by comprising an insulating layer formed on the shell, and a conductive layer formed between the conductive means and the insulating layer.

In this case, it is preferable that the conductive layer be a conductive member group, for example, a conductive layer in which a plurality of conductive members are woven to function as one conductive member.

[0009] The second specific means may further include, in addition to the first specific means, an alarm means for issuing an alarm to a driver, and an alarm by activating the alarm means when the conductive layer is short-circuited to ground. And control means.

According to a third specific means, the second specific means further includes a power cutoff means for cutting off a power supply current supplied from a battery, and the control means determines that the conductive layer is short-circuited to ground. At this time, the power supply cutoff means is activated to cut off the power supply current.

According to a fourth specific means, in the first specific means, the conductive layer may be composed of a plurality of conductive layers separated by an insulating layer. In this case, an alarm unit that issues an alarm to the driver, a power supply interruption unit that interrupts a power supply current supplied from a battery, and an alarm that activates the alarm unit when at least one of the plurality of conductive layers is short-circuited to ground. And a control means for activating the power cutoff means to cut off the power supply current.

According to a fifth specific means, in the first specific means, a monitoring means for applying a potential to the conductive layer and monitoring the potential of the conductive layer between each group, and an output of the monitoring means. Detecting means for detecting a ground short of the wire harness based on
And a cutoff means for cutting off a circuit of the electric conduction means for supplying power. In this case, data that stores data for estimating damage using one or a combination of the frequency of ground short-circuit, short-circuit time, short-circuit location, or importance of the wire harness detected by the detection unit as a parameter. It is also possible to further provide storage means and control means for setting a cutoff condition of the circuit of the cutoff means based on the data stored in the data storage means.

A sixth specific means is the first specific means, wherein a monitoring means for applying a potential to the conductive layer and monitoring the potential of the conductive layer between each group, and monitoring by the monitoring means. Detecting means for detecting a ground short-circuit in the wire harness based on the applied potential, and alarm means for issuing an alarm to the driver when the ground short-circuit in the wire harness is detected by the detecting means. And in this case,
Data storage means for storing data for estimating damage using the frequency, short-circuit time, short-circuit location, and importance of the ground short-circuit of the wire harness detected by the detection means as parameters; and data stored in the data storage means. And control means for changing a level at which an alarm is issued by the alarm means based on the data.

The means for applying a potential includes a member made of a partially broken conductor, a conductor connected to the member, and a pull-up resistor, and the member is made of a conductive layer. It is good to fix it so that it may be crimped to the electric conduction means from the outer periphery of the device.

In the third, fourth, and fifth specific means, a switching element can be used as the power cutoff means.

According to a seventh concrete means, in the first, the fourth and the fifth concrete means, the connection of the wire harness between the groups is performed via a processing unit for controlling the processing of the groups. When an abnormality occurs in the wiring harness, the processing unit at the location where the abnormality has occurred notifies that an abnormality has occurred in the processing unit of another group, and the location where the abnormality has occurred is separated to control the processing unit of another group. It is characterized by having entrusted to.

Further, an eighth specific means is the terminal device according to the first and seventh specific means, wherein the processing unit is a terminal processing unit which performs processing only in each group in charge of the processing unit; And a control unit that performs the entire processing including the processing unit.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of the wire harness of the present invention. The wires 3, 4, and 5 are covered with an insulated wire on the outer periphery, and are surrounded by a short-circuit detecting conductor member 2 made of a conductive material. The outside is covered with an insulating member 6, and the wire harness 1
Is formed. The insulating member 6 has a function of protecting and bundling the short-circuit detecting conductor member 2 and the electric wires 3, 4, and 5, and also prevents the short-circuit detecting conductor member 2 from short-circuiting to the vehicle body ground. The conducting wire 7 is for connecting the short-circuit detecting conductor member 2 to the outside of the harness. In this embodiment, the structure is similar to that of a three-core shielded wire.
Therefore, in this embodiment, the electric wires 3, 4, and 5 function as electric conduction means, and one of them serves as a communication line. Further, the conductor member 2 for detecting a short circuit functions as a conductive layer, and the insulating member 6 functions as an insulating layer.

FIG. 2 shows an example of the short-circuit detection circuit. Potential V by shorting detecting conductor member 2 is pull-up resistor R _1
1 is provided and connected to the (+) terminal of the comparator 8. The (−) terminal of the comparator 8 is a voltage obtained by dividing the voltage V by the resistors R and r.

[0021]

## EQU1 ## where v = V * r / (R + r). The output S _{1 of the} comparator 8 is high when the short-circuit detecting conductor 2 is in a normal state, that is, when ground short-circuiting is not performed, and is low when the short-circuit detecting conductor 2 is short-circuited due to harness rubbing or the like. Therefore, by monitoring the output of the comparator 8, a ground short circuit of the wire harness 1 can be detected. Thus, in this embodiment, as means pull-up resistor R ₁ provides a potential to the conductive layer,
The comparator functions as monitoring means for monitoring the potential.

FIG. 3 shows another embodiment of the conductor member and the insulating member for detecting a short circuit of the wire harness. Insulation member 9
Is made of a flexible member such as a vinyl tape, in which a conductor member 10 is embedded, and an adhesive 11, an insulating member 9 and the conductor member 10 constitute a tape 12 for winding around a wire harness. With this configuration, when the insulating member 9 is broken due to rubbing or the like and a ground short circuit occurs, the conductor member 10 drops to the ground potential, and the short circuit can be detected.

FIG. 4 shows a state in which the tape 12 described in FIG. 3 is wound around the conductors 3, 4, and 5 to form a wire harness. The short-circuit detection circuit may have the same circuit configuration as the circuit shown in FIG. The tape 12 may partially overlap when wound, or may not overlap.

FIG. 5 shows still another embodiment of the conductor member and the insulating member for detecting a short circuit of the present wire harness. The insulating member 13 is formed of a flexible insulating member such as a vinyl tape. The inner conductor member 14 is also formed of a tape-like flexible conductive member such as an aluminum tape. The electric wires 3, 4, and 5 are sequentially wrapped by the conductor member 14 and the insulating member 13. The wires 3, 4,
There is no problem if another conductor or insulating member is placed between the conductor member 5 and the conductor member 14. The short-circuit detection circuit may have the same circuit configuration as the circuit shown in FIG.

FIG. 6 shows still another embodiment of the conductor member and the insulating member for detecting a short circuit of the present wire harness. The insulating member 13 is made of a flexible insulating material such as vinyl. The inner conductor member 14 is also made of a tape-like flexible conductive material such as an aluminum tape.
The electric wires 16, 17, and 18 are sequentially wrapped by the conductor member 14 and the insulating member 13. In this embodiment, the electric wires 16, 17 and 18 are printed on the flexible substrate 19. The short-circuit detection circuit may have the same circuit configuration as the circuit shown in FIG.

FIG. 7 shows a means for fixing the conductor member 14 in FIG. 5 and connecting the conductor 7 to the conductor member 14. As can be seen from this figure, the connection means 15 has a structure in which the conductor 7 is connected to a ring-shaped conductor member 20 having a part 20a.

FIG. 8 shows the connecting means 15 shown in FIG.
The example applied to the wire harness 1 shown in FIG. The connecting means 15 attaches the ring-shaped conductor member 20 to the outer periphery of the conductor member 14 on the side of the wire harness 1 and caulks to sufficiently secure the contact between them. The split 20a is provided as a crimping allowance. In this way, the conductor member 14 inside the insulating member 13 and the conductor member 20 of the connection means 15 are brought into contact with each other to conduct electricity, and a potential is applied to the conductor member 14 by the conductor 7 connected to the conductor member 20. The connection means 15 also has a function of fixing the electric wires 3, 4, 5 and the conductor member 14 together.

FIG. 9 is a view showing an embodiment in which the insulating member and the conductor member in FIG. 1 have a double structure. The outermost first insulating member 21 is used to protect the entire harness. The outermost first conductor member 22 is also used as a ground short detection means for the harness. Even when the conductor member 22 is short-circuited, the second conductor member 14 and the second insulating member are further provided inside the first conductor member 22. Due to the presence of the member 13, a short circuit at this point is merely a warning state. The conductor 23 is for applying a potential to the first conductor member 22. After the outer first conductor member 22 is damaged and the first conductor member 22 is ground short-circuited, the inner second insulation member 13 is further damaged and the second conductor member 1 is damaged.
When the ground short circuit occurs up to 4, the internal electric wire 3,
Since there is a high possibility that damage will occur to 4,5, the abnormality is notified by a method stronger than the alarm. The conductor 7 is the second conductor member 1
4 for applying a potential. In the present embodiment, the combination of the conductor members 14 and 22 and the insulating members 13 and 21 is two layers, but these can be three or more layers.

FIG. 10 is a circuit diagram showing a configuration of the disconnection detecting circuit of the wire harness having the configuration shown in FIG. Through a pull-up resistor R ₁ in the first conductive member 22 potential V ₁
And is connected to the (+) terminal of the comparator 24. The (−) terminal of the comparator 24 receives a voltage expressed by the above equation (1) obtained by dividing the voltage V by the resistors R and r. The output S _{1 of the} comparator 24 is high when the first conductor member 22 is in a normal state, that is, when ground short-circuiting is not performed, and is low when the first conductor member 22 is short-circuited due to harness rubbing or the like. The potential V ₂ is applied to the second conductor member 14 via the pull-up resistor R ₂ and is connected to the (+) terminal of the comparator 25. The (−) terminal of the comparator 25 receives a voltage expressed by the above-described [Equation 1] obtained by dividing the voltage V by the resistors R and r, similarly to the comparator 25.

The output S _{2 of the} comparator 25 is high when the second conductor member 14 is in the normal state, that is, when there is no ground short, and low when the second conductor member 14 is ground short due to harness rubbing or the like. Therefore, by monitoring the outputs of the comparators 24 and 25, the ground short circuit of the wire harness 1 can be detected including the degree of danger.

FIG. 11 is a circuit diagram showing a configuration of a ground short alarm system using the two-layer short detection type wire harness shown in FIG. In the figure, power is supplied from a (+) terminal of a battery 30 to another load through a fusible link 31 and an emergency cutoff relay 32. Power is supplied to the processor 33 as control means through a fuse 34 and a regulator 35. The short-circuit state of the outer first conductor member 22 is detected by the first comparator 24 and the inner second conductor member 22 is detected.
Of the conductor member 14 of the second comparator 2
5 are input to the processor 33. The processor 33 performs processing according to the processing procedure shown in FIG. 12 to determine a danger state of a short circuit. That is, when the first conductor member 22 is short-circuited, the alarm lamp 36 is turned on to call the user's attention. When the second conductor member 14 is short-circuited, it is determined to be in a dangerous state, the driver 37 is turned off, the relay 32 is turned off, and the power supply of the entire automobile is shut off.

FIG. 12 is a flowchart showing the processing procedure of the ground short alarm system using the two-layer short detection type wire harness of FIG. In this process, first, in step S1, the output of the first comparator (A) 24 that detects a short circuit of the outer first conductor member 22 is checked. If the output is high, it is determined that a short circuit has occurred, and the counter A for short circuit detection of the outer first conductor member 22 is incremented in step S2. If the output is low, the process proceeds to step S7. In step S3, the output of the second comparator (B) 25 for detecting a short circuit of the inner second conductor member 14 is checked. If the output is high, it is determined that a short circuit has occurred, and the inner second conductor member 1 is determined in step S4.
The counter B for short detection 4 is incremented.
If the output is low, the process proceeds to step S5. In step S5, and compares the threshold N ₂ defined between the counter B. In this check, the counter B becomes N
If ₂ is greater than or equal to, the second conductive member 14
Is determined to have reached a dangerous state, and the main relay 32 of the power supply is turned off in step S6 to stop the system. On the other hand, the counter B is when N ₂ is smaller than, back to return to the first. Further, when the second comparator (B) 25 output is low in step S3, and compares the threshold N _1, which is the counter A Toara steering set in step S8. If the counter A in this check N ₁ is greater than or equal to the first
It is determined that the short-circuit of the conductor member 22 has progressed and the warning state has been reached, and in step S9, the warning flag is turned on and the alarm lamp and the like are turned on. The counter A in step S7 returns to return the first case N ₁ is less than. In step S7, it is checked whether or not the outer first conductor member 22 is short-circuited. If short-circuited, the process proceeds to step S3, and if not, the process returns.

FIG. 13 shows a vehicular lamp lighting circuit using the wire harness with a short detection function of the present invention.
The current from the battery 30 is controlled by the switch 40, and the lamp load 41 is turned on / off. The wires are connected by connectors 42 and 43, and conductor members 44, 45, 46 and 47 for short-circuit detection are attached to each. Each of the conductor members 44 to 47 is input to a single controller (control device) 48. The system has an alarm lamp 49, and issues an alarm when the conductor member for short-circuit detection has short-circuited (short-circuited) more than a certain number of times.

FIG. 14 shows an example of the internal configuration of the controller 48. The controller 5 includes a comparator 5
1, 52, 53, and 54, each of which has the aforementioned conductor member 44.
Check the voltage of ~ 47. Comparators 51 to
When the (+) input terminal 54 is not short-circuited, the voltages V ₁ , V ₂ , and V via the pull-up resistors R ₁ , R ₂ , R ₃ , and R _{4 respectively.
3,} V ₄ is at stake. During a short circuit, the (+) input terminal is grounded. (-) The input terminal is a resistor R
And r, the voltage expressed by the above equation (1) is applied. The output of each comparator is taken into the CPU 55, and when a high output occurs a predetermined number of times, it is determined that a ground short has occurred in the short detecting conductor member, and processing such as turning on an alarm lamp is performed.

FIG. 15 is a block diagram showing an example in which the wire harness with a short detection function shown in FIG. 13 is applied to an in-vehicle multiplex communication system (hereinafter, referred to as "in-vehicle LAN"). In this example, one BCM (BODY CON
TROL MODULE-vehicle body electrical system control unit) 102, first to third LCUs (local control units-terminal processing units) 103, 104, 105, and first to third cables 107, 108, 109 and the battery 101 connected to the BCM 102 by the fourth cable 106. The in-vehicle LAN system according to the present embodiment is called a centralized control type. Since only the BCM 102 that controls the control has the brain, that is, the microcomputer, there is an advantage that an inexpensive system can be constructed.

The BCM 102 includes a buzzer 110 and a first
In this embodiment, the power line (fourth cable) from the battery 101 is formed by adding a multiplex communication line to the wire harness with a short detection function shown in FIG. And is connected to the vehicle electrical system control unit BCM102. These wires can also be configured separately.

The first LCU 103 is the first cable 10
7 and further connected to the BCM 102, and furthermore, the first and second motors 113 and 114, and these motors
First and second operation switches 119 and 120 for operating 113 and 114 are connected. Second LCU1
04 is connected to the first LCU 103 via the second cable 108, and further connected to the third and fourth motors 115, 11
Sixth and third and fourth operation switches 121 and 122
Is connected to The third LCU 105 is connected to the second LCU 104 via the third cable 109, and is further connected to the third and fourth lamps 117 and 118.

The BCM 102 is connected to the first L via a cable.
A communication function of transmitting / receiving data to / from the CU 103 to the third LCU 105, and first to third LCUs 10 obtained by the communication;
LCUs 103 to 10 based on the information of 3, 104 and 105
5 is a control device that outputs a command for controlling the actuator connected to the control unit 5.

The first to third LCUs 103 to 105 and the BCM 102 are respectively provided with first to fourth operation switches 119 to 122, a buzzer 110, and first and fourth switches.
Lamps 111, 112, 117, and 118, first to fourth motors 113 to 116, and the like are distributed and arranged in the vicinity of many electric devices arranged in the system. The BCM 102 and the LCUs 103 to 105 have built-in short detection circuits for the composite cables 106 to 109. The BCM 102 is a fourth cable 106, the first LCU 103 is a first cable 107,
The second LCU 104 is connected to the second cable 108, the third LCU 1
05 is set so as to detect short-circuit of the third cable 109.

Here, an outline of a series of data transfer procedures will be described. When the BCM 102 transmits data to a certain LCU, the LCU that has received the data
It returns the data it has captured. Therefore,
The communication line in the cable is connected from the BCM 102 to the LCU 10
3 to 105, followed by LC
A data reception signal to the BCM 102 appears from any of U103 to U105. This transmission / reception signal is set as one set, and the same is performed for other LCUs. LCU1
03-105, the data returned to LCU 103-1
05 is input to a load control device built in
The motor 113 connected to the CU 103 to 105
Actuators such as .about.116 are operated, and the states of the various operation switches 119.about.122 captured by the LCUs 103.about.105 are returned to the BCM 102 to become signals for knowing the required operation.

FIG. 16 is a flowchart showing the procedure of the entire communication process. The communication process (FIG. 16A)
The CM 102 is a processing procedure for performing communication with the LCUs 103, 104, and 105. A BGJ (Back Ground Job) process (FIG. 16B) is a process for determining what kind of control is to be performed based on received data. 1 (step S31) to processing n (step S3n). The BGJ process is an infinite loop process executed when no other process is being executed, and is, for example, process 1 (step S31).
When the communication process occurs while the process is being executed, the process of the process 1 (step S31) is temporarily interrupted to execute the communication process. When the communication process is completed, the process 1 (step S31) is performed from the position where the process was interrupted. S31) is restarted.

The communication processing is performed by the LCUs 103, 104, 10
5 is a reception interruption process executed when reception data reaches the BCM 102. In this process, first,
In step S21, a process of receiving data from the LCUs 103 to 105 is executed. Subsequently, step S22
Then, it is checked whether or not a short circuit has occurred in the cables 106 to 109. If it is determined in this check that a short circuit has occurred, a cable short circuit process is executed in step S23, an LCU to be accessed next is selected in step S24, and the LCU selected in step S25 is selected.
Send data to the CU. Step S22
If it is determined that the LCU is not short-circuited, the LCU to be accessed next without executing the cable short-circuiting process
Is selected (step S24), and the data transmission process (step S25) is executed.

FIG. 17 is a flowchart showing a processing procedure in the cable short-circuit processing in step S23. In this process, first, in step S41, the cables 106 to
Nine short-circuit occurrence locations are specified. As described above, the BCM 102 and each of the LCUs 103 to 105 detect a short circuit of the cable 106 to 109, etc.
Which cable is short-circuited can be easily detected. When the short-circuit of the cable is detected in this way, the number of occurrences of the short-circuit is detected. Here, the number of occurrences per unit time is expressed in the form of frequency. Subsequently, if the shortage becomes severe and the failure occurs, in other words, the failure is detected to determine whether the range of the failure relates to safety components such as headlights. Then, points are calculated from map data as shown in FIG. 18 using these as parameters, and the urgency level is determined based on the total points. That is, the process of step S41 is a process for determining what kind of short-circuit state is currently occurring.

When the degree of urgency is calculated in this manner, in step S42, four controls from level 1 to level 4 are selected according to the level.

First, when the total point is 5 or more and less than 15, a process corresponding to the urgency of level 1 is executed in step S43. This process is a temporary alarm process, and outputs an alarm only once when the condition of the point is satisfied or when the ignition key is turned on while the condition is satisfied. If the total points are 15 or more and less than 20, the processing corresponding to the urgency of level 2 is executed in step S44. This process is a continuous alarm process. In this case, the alarm is performed continuously or intermittently to more strongly warn the driver of the abnormality. further,
If the total points are 20 or more and less than 40, step S
At 45, processing corresponding to the level 3 urgency is executed. In this processing, first, the power supply to the downstream is cut off by the upstream LCUs 103 to 105 where the short-circuit of the cables 106 to 109 has occurred, and the step S44 is executed in the step S46.
Continue to issue a continuous alarm as in. By doing so, the power supply at the short-circuit point is cut off, so that the worst situation in which a fire may occur even if the short-circuit phenomenon becomes severe can be avoided, and the driver can be warned of the danger without fail. Subsequently, when the total points become 40 or more, the processing corresponding to the urgency of level 4 is executed in step S47. This process is executed when a short circuit occurs in a position closer to the battery 101. In the worst case, at level 4, all power supplies controlled by LAN communication are shut off to prevent a fire due to a short circuit. If the total points are less than 5,
No particular processing is performed.

By such a process, during driving, the driver is warned of the occurrence of a short circuit to urge the driver to repair the vehicle, and when a short circuit occurs frequently, the power supply is cut off to prevent a vehicle fire from occurring. can do. It is also possible to separate only the short-circuited cable so that power is supplied from another circuit by forming the cable into a loop instead of a daisy chain as in the embodiment. Since the location of the short is known by LAN communication, it is possible to easily determine which cable is short, and to inform each of the LCUs 103 to 105 of the occurrence of the short. Can be executed. This special control processing is, for example,
Since the circuit has been cut off due to the power cutoff, the processing of ignoring the data at the cut off portion or estimating the data is performed. Further, in the case of the LAN system, since the driving state of the vehicle can be grasped, it is possible to detect the shortage of the harness even during parking or transportation, and when it is determined that the harness is short-circuited due to extraneous vibration, the system is immediately activated. It is also possible to shut off the power supply.

FIG. 19 shows a state in which a conductor member 60 having a resistance value A (Ω / m) is wound in a cylindrical shape with a radius R as the conductor member for detecting a short circuit shown in FIG. FIG. 3A is a conceptual diagram showing a wound state, and FIG. 3B is an explanatory diagram showing a relationship between a winding angle and a width. That is, when the width of the conductor member 60 is d and the conductor member 60 is wound at an angle φ without a gap,

[0048]

## EQU2 ## cosφ = d / 4R is satisfied. Therefore, the resistance R ₀ per _turn is:

[0049]

(Equation 3)

Is as follows. Applying a voltage V with a pull-up resistor R ₂ to the conductive member, the potential V _X of the conductive member, as the number of turns of N,

[0051]

N = R ₂ / R ₀ * V _X / (V−V _X )

[0052] Certain ground short portion measures the V _X performed by calculating the above N. That is,

[0053]

V _X = V * R ₀ * N / (R ₀ * N + R ₂ ), and a short can be specified.

As is clear from the above description, the present embodiment has the following effects.

1. Since the short circuit of the conductive layer occurs before the innermost electric conductive means is shorted, the short circuit of the conductive layer can be reliably detected by monitoring the short circuit of the conductive layer.

2. Since the conductive layer is made of a group of conductive members, the possibility of the conductive layer being disconnected due to the impact or frictional force applied to the wire harness can be minimized, so that a short circuit in the wire harness can be reliably detected.

3. When the conductive layer located on the outer peripheral side of the wire harness is short-circuited to the ground, the alarm means for issuing an alarm to the driver and the control means for activating the alarm means and issuing an alarm when the conductive layer is short-circuited to the ground. Since it is not necessarily short-circuited to the electric conduction means, first, an alarm is issued to warn the driver, it is possible to call the driver's attention, and it is possible to prevent a serious accident.

4. In addition to the alarm means, the power supply cutoff means for cutting off the power supply current supplied from the battery is provided. When the conductive layer is short-circuited to ground, the control means activates the power cutoff means to cut off the power supply current. At this point, the power supply current can be cut off, and there is no risk of fire occurring due to the current leakage, and safety can be ensured.

5. Since a plurality of conductive layers are provided with the insulating layer interposed therebetween, it is necessary to detect the depth at which the short-circuit has occurred, that is, the proximity to the electric conduction means, depending on the position of the ground-shortened conductive layer from the outermost periphery of the wire harness. This makes it possible to measure the danger of a short circuit.

6. Alarm means for issuing an alarm to a driver, power supply cutoff means for cutting off a power supply current supplied from a battery, and alarming means for starting the alarm means when at least one of the plurality of conductive layers is short-circuited to ground. Since the control means for activating the cut-off means to cut off the power supply current is provided, the alarm is issued and the power supply current is cut off, so that it is possible to ensure the notification of the danger and ensure the safety.

7. Potential applying means for applying a potential to the conductive layer, monitoring means for monitoring the potential of the conductive layer between each group, detecting means for detecting a ground short of the wire harness based on an output of the monitoring means, and detecting means When a ground short-circuit of the wire harness is detected by the above, since there is provided a cut-off unit for cutting off a circuit of the electric conduction unit that supplies power, the ground short-circuit is detected by a potential applied to the conductive layer, Since the power supply is shut off, a ground short can be reliably detected, and safety can be ensured.

8. Data storage means for storing data for estimating damage using the frequency, short-circuit time, short-circuit location, and importance of the ground short-circuit of the wire harness detected by the detection means as parameters, and data stored in the data storage means And control means for setting the cut-off condition of the circuit of the cut-off means on the basis of, so that the state of the ground short can be clearly grasped by referring to the data stored in the data storage means. The cutoff condition can be set according to the state of the ground short, thereby preventing unnecessary power cutoff.

9. Potential applying means for applying a potential to the conductive layer, monitoring means for monitoring the potential of the conductive layer between each group, detecting means for detecting a ground short of the wire harness based on the output of the monitoring means, When a ground short of the wire harness is detected, an alarm is provided to the driver to issue an alarm. Therefore, it is necessary to reliably detect the state of the ground short by the output of the monitoring means and to issue an alarm to the driver. Can be.

10. The potential applying means includes a member made of a partially broken conductor, a conductor connected to the member, and a pull-up resistor, and the member is connected to the electric conduction means from the outer periphery of the conductive layer. Since it is press-bonded, it is possible to reliably apply a potential by bringing it into contact with the conductive layer for detecting a short circuit of the wire harness.

11. Data storage means for storing data for estimating damage using the frequency, short-circuit time, short-circuit location, and importance of the ground short-circuit of the wire harness detected by the detection means as parameters, and data stored in the data storage means Control means for changing the level at which an alarm is issued by the alarm means on the basis of the data, so that the state of the ground short can be clearly grasped by referring to the data stored in the data storage means. An appropriate alarm can be issued according to the state of the ground short.

12. Since the power cutoff means is composed of a switching element, power can be cut off with a simple configuration.

13. When an abnormality occurs in the wire harness, the processing unit in the location where the abnormality has occurred notifies that an abnormality has occurred in the processing unit in another group, and the location where the abnormality has occurred is separated and transferred to control of another processing unit. Since the means is provided, even if the abnormal part is cut off from the whole, it does not affect the overall control, so that it is possible to ensure the safety and continue the operation at the same time.

14. Since the processing unit is composed of a terminal processing unit that performs only the processing of each group in charge and a control unit that performs the entire processing including these terminal processing units, the processing is entrusted to the processing terminal processing unit of the terminal, and the entire processing is performed. Since the microcomputer which controls the entire system by entrusting it to the control unit may be provided only in the control unit, it is possible to provide an in-vehicle multiplex communication device that can ensure safety at low cost.

According to the first specific solution, the outermost insulating layer of the wire harness acts as a protective layer against biting and coating, and prevents the power supply line from being directly ground short-circuited. When the protection layer is torn and reaches the conductive layer as the biting or coating progresses, the potential of the conductive layer changes. By detecting this change, the presence or absence of a short circuit can be determined. Therefore, when it is determined that a short circuit has occurred, a predetermined process can be performed by the processing unit in charge of the group in which the short circuit has occurred. that time,
Since the conductive layer is formed of the conductive member group, there is little possibility of disconnection even when an external force is applied, and stable performance can be secured.

According to the second specific solution, the control means activates the alarm device when the conductive layer is short-circuited to ground. As a result, an alarm is issued from the alarm device, and the driver can be alerted.

According to the third specific solution, when the conductive layer is short-circuited to the ground, the control means activates the power cutoff means to cut off the power. This makes it possible to prevent a vehicle fire from occurring due to a short circuit.

According to the fourth specific solution, since a plurality of conductive layers for detecting a short circuit are provided, only an alarm is issued depending on which conductive layer is short-circuited, or a power supply is provided in addition to the alarm. The control means determines whether to shut off or the like, and can take appropriate measures according to the position of the layer that has been short-circuited.

According to the fifth specific solution means, a potential is applied to the conductive layer, the monitoring means monitors the potential, and the detection means detects a ground short of the wire harness based on the output of the monitoring means. The shutoff means shuts off the power when the detection means detects a ground short. At this time, the control means controls the frequency of the ground short-circuit, the short-circuit time, and the short-circuit time of the wire harness stored in the storage means.
The state of the ground short is grasped from the data for estimating the damage using the short-circuit location and the degree of importance as parameters, and the power-off condition is set. Thereby, the most appropriate action can be taken according to the state of the ground short.

According to the sixth specific solution, a potential is applied to the conductive layer, the monitor monitors the potential, and the detector detects a ground short-circuit of the wire harness based on the output of the monitor. The control means outputs an alarm via the alarm means when the ground short is detected by the detection means. At this time, the control unit grasps the state of the ground short from the data for estimating the damage using the frequency, the short-circuit time, the short-circuit location, and the importance of the ground short of the wire harness stored in the storage unit as parameters. The level at which an alarm is issued is changed, and control is performed so that the most appropriate alarm is output according to the state of ground short.

According to the seventh specific solution, when an abnormal situation such as a ground short occurs, for example, the processing unit of the group in which the abnormal situation such as the ground short has occurred is notified to that effect by another processing unit. Send, disconnect the location and keep it secure. At this time, if the processing performed by the processing unit is entrusted to another processing unit, it is possible to minimize the influence of the separation of the location as a whole.

According to the eighth specific solution, the multiplex communication device in the vehicle includes, in addition to the terminal processing unit in which the processing unit is in charge of processing or control of only the group in charge of the processing unit, and its own group, Since it is configured to include a control unit that takes charge of control of all terminal processing units and controls overall control, a brain (microcomputer) may be provided only in the control unit that controls overall control. This makes it possible to configure a communication device that can execute desired control at low cost.

[0077]

According to the present invention, it is possible to detect which part of the power supply line is abnormal. According to another aspect of the present invention, the short-circuited portion can be separated, and the other normal portion can be continuously controlled.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a structure of a wire harness according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a short-circuit detection circuit using the wire harness of FIG.

FIG. 3 is a perspective view of a tape including a conductor member for detecting a short circuit and an insulating member according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a state in which the tape of FIG. 3 is wound around a conductive wire.

FIG. 5 is a view showing the structure of a short-circuit detecting conductor member and an insulating member according to another embodiment of the present invention.

FIG. 6 is a view showing a structure of a short-circuit detecting conductor member and an insulating member according to still another embodiment of the present invention.

FIG. 7 is a view showing a structure for fixing a conductor member and connecting an electric wire to the conductor member according to the embodiment of the present invention.

FIG. 8 is a view showing an embodiment in which the structure of FIG. 7 is applied to a wire harness.

FIG. 9 is a perspective view showing an embodiment of the present invention in which an insulating member and a conductor member are formed double.

FIG. 10 is a circuit diagram showing a short-circuit detection circuit using the wire harness having the configuration of FIG. 9;

FIG. 11 is a circuit diagram showing an embodiment of a ground short alarm system using the wire harness having the configuration of FIG. 9;

FIG. 12 is a flowchart showing a processing procedure in the ground short alarm system using the wire harness having the configuration of FIG. 11;

FIG. 13 is a circuit diagram showing an on-vehicle lamp lighting circuit using the wire harness with a short detection function of the present invention.

FIG. 14 is a circuit diagram showing the internal structure of the controller in FIG.

FIG. 15 is a block diagram showing an embodiment in which the wire harness with a short-circuit detection function of the present invention is used in an in-vehicle multiplex communication system (in-vehicle LAN).

16 is a flowchart showing a processing procedure of communication processing in the in-vehicle LAN shown in FIG.

FIG. 17 is a flowchart illustrating a processing procedure in a subroutine of a cable short-circuit processing in FIG. 16;

FIG. 18 is a diagram showing the relationship between points, positions, frequencies, and degrees of importance in the subroutine of step S41 in FIG.

FIG. 19 is an explanatory view showing an embodiment in which a short-circuit detecting conductor member having a resistance value is wound in a cylindrical shape.

[Explanation of symbols]

1 ... wire harness, 2,10,14,22,44,
45, 46, 47 ... (for short-circuit detection) conductor members, 3, 4, 5
... electric wires, 6, 9, 13, 21 ... insulating members, 7, 23 ... conducting wires, 8, 24, 25, 51, 52, 53, 54 ... comparators, 11 ... adhesives, 12 ... tapes, 15 ... connecting means, 16, 17, 18, 20: electric wire, 19: flexible board, 20a: split, 30, 101: battery, 32
... Relay, 33 ... Processor, 36, 49 ... Alarm lamp, 37 ... Driver, 40 ... Switch, 41 ... Lamp load, 48 ... Controller, 55 ... CPU, 102 ... BC
M (BODY CONTROL MODULE), 103, 104, 105 ...
LCU (LOCAL CONTROL UNIT), 106, 107, 10
8, 109 ... composite cable, 110 ... buzzer, 111,
112, 117, 118 ... lamp, 113, 114, 1
15, 116 ... motor, 119, 120, 121, 12
2. Operation switch.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Mitsuru Koni 2477 Takaba, Hitachinaka-shi, Ibaraki F-term in Hitachi Car Engineering Co., Ltd. (Reference) 5G004 AA04 AB03 BA03 BA05 CA01 CA02 DA02 DC05 EA03 5G363 AA20 BA02 DC02

Claims (18)

[Claims] A power supply line connecting a battery power supply and a load; a conductive layer provided on an outer periphery of the power supply line, divided into a plurality of sections, and further provided with a predetermined potential; A vehicle power supply comprising: a controller that monitors changes in the potential of the layers to detect signs of disconnection and / or short circuit in the power supply line. 2. The controller according to claim 1, wherein
A power supply device for a vehicle having a function of monitoring potentials of the plurality of conductive layers and specifying a range of a precursor of a disconnection and / or a short circuit of a power supply line. 3. The power supply device for an automobile according to claim 1, wherein an insulating layer is formed on an outer shell of said conductive layer. 4. The conductive layer comprises a group of conductive members.
4. The power supply line of a vehicle according to 4. 5. The vehicle according to claim 3, wherein the conductive layer and the outermost shell insulating layer are integrated into a tape shape, and the integrated tape is wound around the power supply line. For electric wires. 6. The electric potential applying means includes: a member made of a partially broken conductor; a conductor connected to the member;
The power supply device for a vehicle according to claim 5, wherein the power supply device includes a pull-up resistor, and the member is pressed from an outer periphery of the conductive layer to an electric conduction means. 7. A plurality of various control objects mounted on an automobile are grouped by objects whose arrangement positions are close to each other, and the respective groups including the battery are connected by a processing unit and an integrated wiring. In the in-vehicle multiplex communication device for transmitting information, an electric wire or a group of electric wires including the aggregated wiring, an electric conductive means whose outer peripheral portion is insulated, and an insulating layer formed on the outermost shell of the electric conductive means, An in-vehicle multiplex communication device comprising: a conductive layer formed between the electric conduction means and the insulating layer. 8. The apparatus according to claim 7, further comprising alarm means for issuing an alarm to a driver, and control means for activating said alarm means and issuing an alarm when said conductive layer is short-circuited to ground. The multiplex communication device for a vehicle according to claim 1. 9. A power supply interrupting means for interrupting a power supply current supplied from a battery, wherein the control means activates the power supply interrupting means when the conductive layer is short-circuited to ground to interrupt the power supply current. The vehicle multiplex communication device according to claim 8, wherein 10. The multiplex communication device for a vehicle according to claim 7, wherein a plurality of said conductive layers are provided with an insulating layer interposed therebetween. 11. An alarming means for issuing an alarm to a driver, a power supply interrupting means for interrupting a power supply current supplied from a battery, and activating said alarming means when at least one of the plurality of conductive layers is short-circuited to ground. 11. The in-vehicle multiplex communication device according to claim 10, further comprising: a control unit that issues an alarm and activates the power cutoff unit to cut off a power supply current. 12. A potential applying means for applying a potential to said conductive layer, a monitoring means for monitoring the potential of said conductive layer between each group, and detecting a ground short of an electric wire or a group of electric wires based on an output of said monitoring means. And a shutoff means for shutting off a circuit of the electric conduction means for supplying power when the detection means detects a ground short of the electric wire or the electric wire group. Item 8. An in-vehicle multiplex communication device according to item 7. 13. Data for estimating damage using as a parameter one or more of the frequency of ground short-circuit, short-circuit time, short-circuit location, or importance of a wire or a wire group detected by the detection means. 10. The vehicle according to claim 9, further comprising: stored data storage means; and control means for setting a cutoff condition of a circuit of the cutoff means based on the data stored in the data storage means. Multiplex communication device. 14. A potential applying means for applying a potential to said conductive layer, a monitoring means for monitoring the potential of said conductive layer between each group, and detecting a ground short-circuit of an electric wire or a group of electric wires based on an output of said monitoring means. 13. The vehicle according to claim 12, further comprising: a detecting unit for detecting a short-circuit of a wire or a group of wires detected by the detecting unit, and a warning unit for issuing a warning to a driver when the detecting unit detects a ground short-circuit. Internal multiplex communication device. 15. Data for estimating damage using one or more combinations of the frequency of ground short-circuit, short-circuit time, short-circuit location, or importance of a wire or a wire group detected by the detection means as a parameter. 15. The apparatus according to claim 8, further comprising a stored data storage means, and control means for changing a level at which an alarm is issued by the alarm means based on the data stored in the data storage means. The in-vehicle multiplex communication device according to any one of the preceding claims. 16. The in-vehicle multiplex communication device according to claim 9, wherein said power cutoff means comprises a switching element. 17. When an abnormality occurs in the electric wire or the group of electric wires, a processing unit in a location where the abnormality has occurred notifies that an abnormality has occurred in a processing unit in another group, and the location where the abnormality has occurred is separated. 15. The in-vehicle multiplex communication device according to claim 7, further comprising a unit that delegates control of another group of processing units. 18. A terminal processing unit for performing processing only for each group in which said processing unit is in charge, and a control unit for performing overall processing including these terminal processing units. 2. The multiplex communication device in a vehicle according to claim 1.