JP7010617B2 - Vehicle circuit - Google Patents

Description

The present invention relates to a wire harness mounted on a vehicle or a circuit body for a vehicle having an equivalent function thereof, and particularly to a technique for ground connection.

Conventionally, in vehicles, various types of electrical components called auxiliary machines have been mounted on various parts of the vehicle body. Most of these accessories require the supply of power. In addition, communication may be performed between a plurality of auxiliary devices, or signals such as switches and sensors may be transmitted.

Therefore, in a general vehicle, wire harnesses, which are aggregates of a large number of electric wires and the like, are arranged at various places on the vehicle body. Then, using this wire harness, the power supply (battery or alternator) on the vehicle is connected to each auxiliary machine, or the auxiliary machines are connected to each other.

Regarding the ground connection, since the car body is made of conductive metal in a general vehicle, it can be used as a body ground, and it is not always necessary to incorporate a ground line in the wire harness. .. On the other hand, in the case of a vehicle in which most of the vehicle body is made of resin, body ground cannot be used, so it is necessary to prepare a member for ground connection.

For example, the wire harness shown in Patent Document 1 includes a power supply line, a communication line, and a ground line on the trunk line. Therefore, even if the body ground is not used, each auxiliary machine can be connected to the ground on the vehicle side by using the ground line on the main line.

Further, Patent Document 2 discloses a wiring structure of a wire harness in which a long ground member having an L-shaped cross section is provided and a wire harness is arranged at a position adjacent to the ground member. Therefore, even if the ground line is not incorporated in the wire harness, each auxiliary machine can be connected to the ground by using the ground member in the vicinity of the wire harness.

JP-A-2015-227089 Japanese Unexamined Patent Publication No. 2016-1111826

By the way, since an electric resistance also exists in the ground line, a relatively large voltage drop occurs especially when a large power supply current flows to the ground. In addition, a large voltage drop occurs even in a place where current is concentrated. Therefore, the potential at the connection point between each auxiliary machine and the ground line fluctuates for each auxiliary machine.

For example, when the body ground of a vehicle is used, the cross-sectional area of the path through which the ground current passes is sufficiently large, so that each auxiliary machine can be suppressed from being adversely affected by the generated voltage drop. However, when using a ground line built into a wire harness or a special ground member, it may not be possible to secure a sufficient cross-sectional area of the path through which the ground current passes, so there is a high possibility that a voltage drop will occur in the ground. Become.

In the configuration example shown in FIG. 13, the signal system load 102 and the drive system load 103 are connected to the power supply line connected to the positive electrode side terminal of the battery 101. Further, the ground terminal of the signal system load 102 and the ground terminal of the drive system load 103 are connected to different points of the common ground structure 104, and the ground structure 104 is connected to the negative electrode side terminal of the battery 101. Has been done. Here, the potential change V11 of the signal system load grounding point on the ground structure 104 (floating with respect to the reference potential of the ground (GND)) and the potential change V12 of the drive system load grounding point are expressed by the following equations.

V11 = (I1p + I1s) x Z11
V12 = V11 + 11p × Z12
However,
I1s: Power supply current of signal system load I1p: Power supply current of drive system load Z11: Electrical resistance of the path from the signal system load grounding point on the ground structure to the battery Z12: Signal from the drive system load grounding point on the ground structure Electrical resistance to system load grounding point

That is, since both the currents I1s and I1p pass in common in the ground path of the signal system load 102, a large potential change V11 occurs when the current I1p is large even when the current I1s is small. In reality, the current I1s of the signal system load in the vehicle is often very small, for example, about 1 [A] or less, but the total current I1p of the drive system load is often 200 [A] or more, so it is large. The potential change V11 is generated.

When the ground potential of the signal system load fluctuates greatly, the threshold value for discriminating the high / low potential of the input signal or the control signal, for example, fluctuates in the signal system load, which becomes a major factor of malfunction. For example, when the drive system load 103 operates, there is a high possibility that the signal system load 102 will malfunction at the same time.

Further, if the electric resistances Z11 and Z12 of the ground are large, the power supply voltage applied between the terminals of the drive system load 103 decreases by the amount of the voltage drop (V11 + V12), so that the output of the drive system load 103 decreases, which is the original value. Performance cannot be obtained. Further, not only the ground but also the power supply line side, the voltage drop occurs according to the current, so that the influence also occurs.

On the other hand, when the drive system load 103 is switched at high speed, since the switching current is large, a large electromagnetic noise is radiated from the line to the surroundings. Then, the radiated electromagnetic noise invades the control circuit in the signal system load 102 via the surrounding line or directly, causing a malfunction of the auxiliary machine.

The present invention has been made in view of the above circumstances, and an object of the present invention is to cause a malfunction of an auxiliary machine or an auxiliary machine even when a large current flows from a power source on a vehicle to various auxiliary machines. It is an object of the present invention to provide a circuit body for a vehicle capable of suppressing the deterioration of the performance of the vehicle.

In order to achieve the above-mentioned object, the vehicle circuit body according to the present invention is characterized by the following (1) to ( 3 ).
(1) A vehicle circuit body installed in a vehicle.
It is equipped with a trunk line that can be connected to a plurality of auxiliary equipment mounted on the vehicle via a branch line or a branch circuit.
The trunk line
A power supply line that can distribute electric power from the power supply mounted on the vehicle and supply it to each of the plurality of auxiliary machines.
A ground line that can be electrically connected between the ground terminal of the power supply and the plurality of auxiliary machines.
A communication line shared by a plurality of the auxiliary machines having a communication function as a signal transmission line is provided.
The ground line includes a first ground line connected to an auxiliary machine through which a large current flows among the plurality of the auxiliary machines, and a second ground line connected to an auxiliary machine through which a current smaller than the large current flows. Including
The power supply line includes a first power supply line that supplies power to the auxiliary machine through which the large current flows, and a second power supply line that supplies power to the auxiliary equipment through which a current smaller than the large current flows.
It is determined that only the first power supply line among the first power supply line and the second power supply line is arranged in the space sandwiched between the first ground line and the second ground line. A characteristic vehicle circuit body.

( 2 ) The first ground line and the second ground line are electrically insulated from each other and arranged side by side on the same wiring path in a state of being substantially parallel to each other. The vehicle circuit body according to (1) above.

( 3 ) A vehicle circuit body installed in a vehicle.
It is equipped with a trunk line that can be connected to a plurality of auxiliary equipment mounted on the vehicle via a branch line or a branch circuit.
The trunk line
A power supply line that can distribute electric power from the power supply mounted on the vehicle and supply it to each of the plurality of auxiliary machines.
A ground line that can be electrically connected between the ground terminal of the power supply and the plurality of auxiliary machines.
A communication line shared by a plurality of the auxiliary machines having a communication function as a signal transmission line is provided.
The ground line includes a first ground line connected to an auxiliary machine through which a large current flows among the plurality of the auxiliary machines, and a second ground line connected to an auxiliary machine through which a current smaller than the large current flows. Including
The first ground line and the second ground line are electrically insulated from each other and arranged side by side on the same wiring path in a state of being substantially parallel to each other.
A vehicle circuit characterized in that the second ground line is arranged at an outer position where the distance from the surface of the vehicle body is farther than the power supply line and the first ground line. body.

According to the vehicle circuit body having the configuration of (1) above, the first ground line and the second ground line that are selectively used according to the magnitude of the current supplied to the connected auxiliary equipment are Since it is provided in an independent state, it is possible to suppress malfunction of auxiliary equipment. That is, since a large current flows only in the first ground line and the current flowing in the second ground line is small, the voltage drop generated in the second ground line is small, and the ground potential of the auxiliary machine having a small current is almost the same. It does not change and does not cause malfunction. Further, since the current flowing through the second ground line is small and the conductor in this path does not need to have a large cross-sectional area, even if both the first ground line and the second ground line are provided, the main line is provided. Can prevent bloating.

Further, according to the vehicle circuit body having the configuration of (1) above, the first power supply line and the second power supply line that are selectively used according to the magnitude of the current supplied to the connected auxiliary equipment. Is provided in an independent state, so it is possible to prevent a drop in the power supply voltage applied between the terminals of the auxiliary equipment with a small current. Further, since the current flowing through the second power supply line is small and the conductor in this path does not need to have a large cross-sectional area, even if both the first power supply line and the second power supply line are provided, the main line is provided. Can prevent bloating.
Further, according to the vehicle circuit body having the configuration of (1) above, since the first ground line and the second ground line are connected to the-side (ground side) of the power supply, they are used as an electromagnetic shield. can. That is, the electromagnetic noise radiated by the current from the power supply line arranged in the space sandwiched between the first ground line and the second ground line is outside the first ground line and the second ground line. It can be shielded from being radiated to the outside of these, and the adverse effect of noise on the auxiliary equipment installed on these outside can be avoided.

According to the vehicle circuit body having the configuration of ( 2 ) above, since the first ground line and the second ground line are arranged side by side on the main line, the body ground of the vehicle and the special ground member cannot be used. Even in the environment, various types of auxiliary equipment can be grounded using the trunk line.

According to the vehicle circuit body having the above configuration ( 3 ), since the second ground line having almost no change in potential is arranged at the outermost position, the second ground line can be used as an electromagnetic shield. That is, the electromagnetic noise radiated from the power supply line or the first ground line by the current reduces the radiation to the outside of the second ground line, so that the adverse effect of the noise on the outer auxiliary equipment can be avoided.

According to the vehicle circuit body of the present invention, even when a large current flows from the power supply on the vehicle to various auxiliary equipment, the auxiliary equipment having a small current may malfunction or the applied power supply voltage may be increased. It is possible to suppress the deterioration of the performance of the auxiliary machine due to the deterioration.

The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through the embodiments described below (hereinafter referred to as "embodiments") with reference to the accompanying drawings. ..

FIG. 1 is a perspective view showing a configuration example of a main part of an in-vehicle device including a vehicle circuit body according to the first embodiment of the present invention. FIG. 2 is a wiring diagram showing a configuration example of an in-vehicle device including a vehicle circuit body according to the first embodiment of the present invention. 3A and 3B are vertical cross-sectional views showing a cross-sectional structure of a backbone trunk line portion 61 having two power supply lines, respectively. 4 (a) and 4 (b) are vertical cross-sectional views showing a cross-sectional structure of a trunk line in which the positional relationship of each component is different from that of FIGS. 3 (a) and 3 (b). FIG. 5 is a vertical cross-sectional view showing the cross-sectional structure of the trunk line according to the first modification of the first embodiment. FIG. 6 is a vertical cross-sectional view showing the cross-sectional structure of the trunk line according to the second modification of the first embodiment. FIG. 7 is a vertical cross-sectional view showing the cross-sectional structure of the trunk line according to the modified example 3 of the first embodiment. FIG. 8 is a vertical cross-sectional view showing the cross-sectional structure of the trunk line according to the modified example 4 of the first embodiment. FIG. 9 is a wiring diagram showing a configuration example of an in-vehicle device including a vehicle circuit body according to the second embodiment of the present invention. 10 (a) and 10 (b) are vertical cross-sectional views showing a cross-sectional structure of a backbone trunk line portion 61B having one power supply line, respectively. 11 (a) and 11 (b) are vertical cross-sectional views showing a cross-sectional structure of a trunk line in which the positional relationship of each component is different from that of FIGS. 10 (a) and 10 (b). FIG. 12 is a vertical cross-sectional view showing the cross-sectional structure of the trunk line according to the first modification of the second embodiment. FIG. 13 is a wiring diagram showing a configuration example of a general in-vehicle device.

Specific embodiments of the present invention will be described below with reference to the respective figures.

(First Embodiment)
FIG. 1 shows a configuration example of a main part of an in-vehicle device including a vehicle circuit body according to the first embodiment of the present invention.

The vehicle circuit body shown in FIG. 1 supplies electric power of a main power source such as an in-vehicle battery to auxiliary equipment of each part of the vehicle body, that is, various electrical components, and exchanges signals between the electrical components. It is used as a necessary transmission line for this purpose. That is, it is functionally the same as a general wire harness, but its structure is significantly different from that of a general wire harness.

The in-vehicle device shown in FIG. 1 represents a configuration on the vehicle interior side in the vicinity of the dash panel 16 that partitions the engine room 11 and the vehicle interior (passenger room) 13 of the vehicle body. A lean hose (not shown), which is a reinforcing material, is installed in the instrument panel portion (part of the instrument panel) slightly behind the dash panel 16 so as to extend in the left-right direction of the vehicle body. A part of the components of the vehicle circuit body is arranged in the vicinity of the lean hose or the dash panel 16.

The vehicle circuit body shown in FIG. 1 includes a plurality of backbone trunk lines 21, 22, 23, and a plurality of backbone control boxes 31, 32, 33. Each of the backbone trunk lines 21, 22, and 23 includes lines such as a power supply line, an earth line, and a communication line. For the power supply line and ground line in each backbone trunk, for example, a strip-shaped metal material with a flat cross-sectional shape (for example, copper or aluminum) is used, and these metal materials are electrically insulated from each other in the thickness direction. It is configured by stacking on. This allows the passage of a large current and makes bending in the thickness direction relatively easy.

The backbone trunk lines 21 and 22 are arranged along the surface of the dash panel 16 at a position above the lean hose and linearly arranged in the left-right direction so as to be substantially parallel to the lean hose. Further, the backbone trunk line portion 23 is arranged at a substantially central portion in the left-right direction of the vehicle body, and extends linearly in the vertical direction at a portion along the surface of the dash panel 16. Further, the backbone trunk line portion 23 is bent in the thickness direction by approximately 90 degrees near the boundary between the dash panel 16 and the vehicle interior floor, and is arranged so as to extend in the front-rear direction of the vehicle body along the vehicle interior floor. The backbone trunk lines 21 and 22 may be fixed to the lean hose, or a dedicated member to which the backbone trunk lines 21 and 22 are fixed may be arranged.

The backbone control box 32 is arranged substantially in the center of the vehicle body in the left-right direction, the backbone control box 31 is arranged in the vicinity of the left end in the left-right direction, and the backbone control box 33 is arranged in the vicinity of the right end in the left-right direction.

The left end of the backbone trunk line portion 21 is connected to the right end of the backbone control box 31, and the right end of the backbone trunk line portion 21 is connected to the left end of the backbone control box 32. Further, the left end of the backbone trunk line portion 22 is connected to the right end of the backbone control box 32, and the right end of the backbone trunk line portion 22 is connected to the left end of the backbone control box 33. Further, the front tip of the backbone trunk line portion 23 is connected to the lower end of the backbone control box 32.

That is, the backbone trunk lines 21 to 23 and the backbone control boxes 31 to 33 are configured to have a shape similar to a T shape as shown in FIG. Further, the internal circuits of the backbone trunk lines 21 to 23 are in a state of being electrically connectable to each other via the backbone control box 32.

The backbone control box 31 arranged on the left side of the vehicle body includes a main power supply connection portion 31a, a trunk line connection portion 31b, and a branch line connection portion 31c. As shown in FIG. 1, the main power cable 41 is connected to the main power connection portion 31a of the backbone control box 31, the left end of the backbone trunk line portion 21 is connected to the trunk line connection portion 31b, and the branch line connection portion 31c is connected to the branch line connection portion 31c. A plurality of branch line sub-harnesses 42 are connected to each other. Note that FIG. 1 shows a state in which the branch line sub-harness 42 is detached from the backbone control box 31 in order to show that the branch line sub-harness 42 is detachable from the backbone control box 31.

Further, although not shown in FIG. 1, the backbone trunk line portion 21 includes two power supply lines, two ground lines, and a communication line. Further, in order to connect to the power supply line and the ground line of the main power supply cable 41, a plurality of connection terminals are provided in the main power supply connection portion 31a.

Further, inside the backbone control box 31, the power supply system, the ground system, and the communication system of each circuit are connected to each other and power is distributed between the main power cable 41, the backbone trunk line portion 21, and the branch line sub-harness 42. Circuit board is included.

For the main power cable 41, connect the terminals connected to the ends of the power line and the ground line to the terminals of the main power connection portion 31a, and connect these circuits by fixing them with bolts and nuts. Can be done.

The branch line sub-harness 42 is provided with a connector at the tip thereof that is detachable from the branch line connection portion 31c, and the circuit of the branch line sub-harness 42 can be connected as needed. Each of the branch line sub-harnesses 42 is configured to include all or part of a power line, a ground line, a communication line. In the backbone control box 31 shown in FIG. 1, the branch line connecting portion 31c is provided with six connectors, and a maximum of six branch line sub-harnesses 42 can be connected.

As shown in FIG. 1, the backbone (backbone) is formed by combining the backbone trunk lines 21 to 23 and the backbone control boxes 31 to 33, and further connecting various branch line sub-harnesses 42 to 44 to the backbone control boxes 31 to 33. ) With a simple structure, it is possible to route various transmission lines. That is, in the vehicle circuit body according to the embodiment of the present invention, the backbone trunk lines 21 to 23 and the backbone control boxes 31 to 33 are configured as a backbone having functions as a backbone portion related to power distribution and communication transmission. , A branch line sub-harness is appropriately connected to this backbone.

For example, various electrical components that are optional or additionally mounted on the vehicle can be handled by simply adding or changing the branch line sub-harnesses 42 to 44 connected to any of the backbone control boxes 31 to 33. There is no need to change the structure of the backbone of the circuit body. In this embodiment, it is assumed that the branch line sub-harnesses 42 to 44 are connected to the backbone control boxes 31 to 33, but for example, another branch is provided at an appropriate relay point on the backbone trunk line portions 21 to 23. A branch line sub-harness (not shown) may be connected.

In an actual in-vehicle device, for example, as shown in FIG. 1, an auxiliary device such as an electronic control unit (ECU) 51 provided in a vehicle via a branch line sub-harness 42 is installed in a backbone control box 31 and other electrical components. Can be connected to the product. Further, the electronic control units 51, 52, 53 and other electrical components can be connected to the backbone control box 32 via the branch line sub-harness 43. Further, various electrical components can be connected to the backbone control box 33 via the branch line sub-harness 44. Then, each of the electronic control units 51, 52, 53 can control various electrical components on the vehicle via the communication lines of the branch line sub-harnesses 42, 43, 44, the backbone control boxes 31 to 33, and the like. can.

Next, a specific example of the circuit configuration will be described.
FIG. 2 shows a configuration example of an in-vehicle device including a vehicle circuit body according to the first embodiment of the present invention. The in-vehicle device shown in FIG. 2 includes backbone trunk lines 61, 62, 63, backbone control boxes 64, 65, 66, and a plurality of drive train auxiliary machines 81 (1) to 81 (N), 83 (1) to 83 ( N), 85 (1) to 85 (N), a plurality of signal system auxiliary machines 82 (1) to 82 (N), 84 (1) to 84 (N), and 86 (1) to 86 (N). I have.

As shown in FIG. 2, each of the backbone trunk lines 61, 62, and 63 has four independent lines of a signal system power supply line 71, a signal system ground line 72, a drive system power supply line 73, and a drive system ground line 74. It is equipped with.

The signal system power supply line 71 and the signal system ground line 72 each consume a relatively small power supply current, and for example, an auxiliary machine having a rated current of 10 [A] or less (referred to as a "signal system auxiliary machine" in the present embodiment). ) Is a power supply line and a ground line prepared to supply power. For example, a meter unit, an audio device, various electronic control units (ECUs), a small lighting device, etc. mounted on a vehicle correspond to "signal system auxiliary equipment".

On the other hand, the drive system power supply line 73 and the drive system ground line 74 each consume a very large power supply current, for example, an auxiliary machine having a rated current exceeding 10 [A] (“drive system auxiliary machine” in this embodiment”. A power supply line and a ground line prepared to supply power to the power supply (referred to as). For example, an electric motor, various heaters, headlights, etc. for generating driving force of various actuators on a vehicle correspond to "drive system auxiliary equipment".

Since various auxiliary equipment classified as "drive system auxiliary equipment" is connected to the drive system power supply line 73 and the drive system ground line 74, the current of the entire drive system vehicle is about 200 to 300 [A] at the peak. Becomes a large current. On the other hand, since only the auxiliary equipment classified as the "signal system auxiliary equipment" whose current consumption is smaller than that of the drive system is connected to the signal system power supply line 71 and the signal system ground line 72, the signal system power supply line 71 and the signal system ground are connected. The peak value of the current flowing through the line 72 is much smaller than that of the drive system power supply line 73 and the drive system ground line 74.

In the configuration shown in FIG. 2, one end of the signal system power supply line 71 and the drive system power supply line 73 included in the backbone trunk line portion 61 is connected to the positive electrode side terminal 10a of the power supply 10, and the other end thereof. The side is connected to the backbone control box 64. The power supply 10 corresponds to a main battery or an alternator mounted on the vehicle. Further, one end side of the signal system ground line 72 and the drive system ground line 74 included in the backbone trunk line portion 61 is connected to the negative electrode side terminal 10b of the power supply 10, and the other end side is connected to the backbone control box 64. It is connected.

Further, each of the signal system power supply line 71, the signal system ground line 72, the drive system power supply line 73, and the drive system ground line 74 included in the backbone trunk line portion 61 corresponds to each other included in the backbone trunk line portion 62. It is connected to the line. Further, each of the signal system power supply line 71, the signal system ground line 72, the drive system power supply line 73, and the drive system ground line 74 included in the backbone trunk line portion 61 goes through the internal circuit of the backbone control box 64. , Is connected to the corresponding line included in the backbone trunk line 63.

Inside each of the backbone control boxes 64, 65, and 66, as shown in FIG. 2, a signal system power distribution unit, a signal system GND (ground, that is, ground) distribution unit, a drive system power distribution unit, and a drive system power distribution unit, and It is equipped with a GND distribution unit for the drive system. The signal system power distribution unit is connected to the signal system power supply line 71, the signal system GND distribution unit is connected to the signal system ground line 72, and the drive system power distribution unit is connected to the drive system power supply line 73. The GND distribution unit of the drive system is connected to the drive system ground line 74.

As shown in FIG. 2, a plurality of drive system auxiliary machines 81 (1) to 81 (N) and a plurality of signal system auxiliary machines 82 (1) to 82 (N) are connected under the backbone control box 64. Has been done. Each of these accessories is connected to the backbone control box 64 via a branch line sub-harness.

Similarly, a plurality of drive system auxiliary machines 83 (1) to 83 (N) and a plurality of signal system auxiliary machines 84 (1) to 84 (N) are connected under the backbone control box 65. Further, under the backbone control box 66, a plurality of drive system auxiliary machines 85 (1) to 85 (N) and a plurality of signal system auxiliary machines 86 (1) to 86 (N) are connected.

For example, in the backbone control box 64, the power distribution unit of the drive system distributes the power of the drive system power supply line 73 to each of the plurality of paths. Then, each electric power distributed by the power distribution unit of the drive system is supplied to each power terminal of the drive system auxiliary machines 81 (1) to 81 (N) via the branch line sub-harness. On the ground side as well, the drive system ground line 74 is branched into a plurality of current paths by the GND distribution unit of the drive system. Then, each of the plurality of branched current paths is connected to the ground terminal of each of the drive system auxiliary machines 81 (1) to 81 (N) via the branch line sub-harness.

Further, in the backbone control box 64, the power distribution unit of the signal system distributes the power of the signal system power supply line 71 to each of the plurality of paths. Then, each electric power distributed by the power distribution unit of the signal system is supplied to each power terminal of the signal system auxiliary machines 82 (1) to 82 (N) via the branch line sub-harness. On the ground side as well, the signal system ground line 72 is branched into a plurality of current paths by the GND distribution unit of the signal system. Then, each of the plurality of branched current paths is connected to the ground terminal of each of the signal system auxiliary machines 82 (1) to 82 (N) via the branch line sub-harness.

Even in the backbone control box 65, the power distribution unit of the drive system distributes the power of the drive system power supply line 73 to each of the plurality of paths. Then, each electric power distributed by the power distribution unit of the drive system is supplied to each power terminal of the drive system auxiliary machines 83 (1) to 83 (N) via the branch line sub-harness. Further, the GND distribution unit of the drive system branches the drive system ground line 74 into a plurality of current paths. Then, each of the plurality of branched current paths is connected to the ground terminal of each of the drive system auxiliary machines 83 (1) to 83 (N) via the branch line sub-harness.

Further, in the backbone control box 65, the power distribution unit of the signal system distributes the power of the signal system power supply line 71 to each of the plurality of paths. Then, each electric power distributed by the power distribution unit of the signal system is supplied to each power terminal of the signal system auxiliary machines 84 (1) to 84 (N) via the branch line sub-harness. On the ground side as well, the signal system ground line 72 is branched into a plurality of current paths by the GND distribution unit of the signal system. Then, each of the plurality of branched current paths is connected to the ground terminal of each of the signal system auxiliary machines 84 (1) to 84 (N) via the branch line sub-harness.

Also in the backbone control box 66, the power distribution unit of the drive system distributes the power of the drive system power supply line 73 to each of the plurality of paths. Then, each electric power distributed by the power distribution unit of the drive system is supplied to each power terminal of the drive system auxiliary machines 85 (1) to 85 (N) via the branch line sub-harness. Further, the GND distribution unit of the drive system branches the drive system ground line 74 into a plurality of current paths. Then, each of the plurality of branched current paths is connected to the ground terminal of each of the drive system auxiliary machines 85 (1) to 85 (N) via the branch line sub-harness.

Further, in the backbone control box 66, the power distribution unit of the signal system distributes the power of the signal system power supply line 71 to each of the plurality of paths. Then, each electric power distributed by the power distribution unit of the signal system is supplied to each power terminal of the signal system auxiliary machines 86 (1) to 86 (N) via the branch line sub-harness. On the ground side as well, the signal system ground line 72 is branched into a plurality of current paths by the GND distribution unit of the signal system. Then, each of the plurality of branched current paths is connected to the ground terminal of each of the signal system auxiliary machines 86 (1) to 86 (N) via the branch line sub-harness.

Therefore, in the configuration shown in FIG. 2, any of the drive system auxiliary machines 81 (1) to 81 (N), 83 (1) to 83 (N), and 85 (1) to 85 (N) is used. However, the power supply current is supplied through the drive system power supply line 73, and the current on the ground side flows to the drive system ground line 74. On the other hand, for any of the signal system auxiliary machines 82 (1) to 82 (N), 84 (1) to 84 (N), 86 (1) to 86 (N), the power supply current is the signal system power supply line. It is supplied through 71, and the current on the ground side flows to the signal system ground line 72.

That is, the signal system and the drive system are completely independent of both the supply path of the power supply current to each auxiliary machine and the path through which the ground current flows. Therefore, in any of the current paths on the backbone trunk lines 61, 62, and 63, the drive system auxiliary equipment 81 (1) to 81 (N), 83 (1) to 83 (N), 85 (1) to 85 ( The voltage drop caused by the power supply current and the ground current flowing in N) is the currents of the signal system auxiliary devices 82 (1) to 82 (N), 84 (1) to 84 (N), 86 (1) to 86 (N). It does not affect the voltage of the path. Moreover, the magnitude of the current flowing through the signal system auxiliary machines 82 (1) to 82 (N), 84 (1) to 84 (N), 86 (1) to 86 (N) is determined by the drive system auxiliary equipment 81 (1). )-81 (N), 83 (1) -83 (N), 85 (1) -85 (N).

Therefore, each of the voltage drop in the signal system power supply line 71 and the voltage drop in the signal system ground line 72 is tolerably small even when the cross-sectional area of the conductor of each line is relatively small. Therefore, the ground potentials of the signal system auxiliary machines 82 (1) to 82 (N), 84 (1) to 84 (N), and 86 (1) to 86 (N) are the reference potentials of the ground, that is, the power supply 10. It is possible to prevent the potential of the negative electrode side terminal 10b from becoming higher or fluctuating. As a result, it is possible to prevent the occurrence of malfunction in each signal system auxiliary machine 82.

Further, since the voltage drop in the power supply line and the ground line is small and the power supply voltage applied between the terminals of the signal system auxiliary equipment 82 can be prevented from decreasing, each signal system auxiliary equipment 82 has a predetermined performance according to the rating. Can be demonstrated. For example, when a lighting tool such as a stop lamp or a tail lamp of a vehicle is connected as one of the signal system auxiliary machines 82, it is possible to prevent the light amount of the stop lamp or the tail lamp from decreasing.

Although not shown in FIG. 2, a communication line may be included inside the backbone trunk lines 61 to 63. This makes it possible to communicate between a plurality of auxiliary machines using the trunk line.

Next, a specific configuration example of the backbone trunk line portion will be described.
3 (a) and 3 (b) are views showing a cross-sectional structure of a backbone trunk line portion 61 having two power supply lines, respectively. Note that the cross-sectional shapes of the power supply line and the communication line constituting the backbone trunk line portion 61 are different between FIGS. 3A and 3B.

<Structure example 1>
In the configuration shown in FIG. 3A, each of the signal system power supply line 71, the signal system ground line 72, the drive system power supply line 73, and the drive system ground line 74 constituting the backbone trunk line portion 61 has a cross-sectional shape. It is composed of circular covered wires. Each coated electric wire is composed of an internal conductor 75 having a circular cross-sectional shape and an insulating coating 76 that covers the entire periphery thereof. The insulating coating 76 is made of resin or the like. Therefore, the signal system power supply line 71, the signal system ground line 72, the drive system power supply line 73, and the drive system ground line 74 are electrically separated from each other.

Further, the signal system power supply line 71, the signal system ground line 72, the drive system power supply line 73, and the drive system ground line 74 are arranged in a row and arranged in parallel with each other. The drive system power supply line 73 is arranged so as to be sandwiched between the signal system ground line 72 and the drive system ground line 74.

By arranging in this way, it is possible to suppress electromagnetic noise from being radiated to the outside. That is, since a large current flows through the drive system power supply line 73, large electromagnetic noise is radiated from the drive system power supply line 73 due to current switching and the like. However, since the potential of the signal system ground line 72 and the potential of the drive system ground line 74 are almost the same as the reference potential of the ground, electromagnetic shielding can be performed, and the signal system ground line 72 and the drive system ground line 74 can be performed. It is possible to reduce the radiation of electromagnetic noise to the outside of the.

In order to fix the signal system power supply line 71, the signal system ground line 72, the drive system power supply line 73, and the drive system ground line 74 in the positional relationship shown in FIG. It is integrated or integrated by covering the outside with an exterior material (not shown). Further, since the current flowing through the signal system power supply line 71 and the signal system ground line 72 is relatively small, the cross-sectional area of the internal conductor 75 in the signal system power supply line 71 and the signal system ground line 72 is the cross-sectional area of the drive system power supply line 73 and the drive system. It may be smaller than the cross-sectional area of the ground line 74.

<Structure example 2>
In the configuration shown in FIG. 3B, each of the signal system power supply line 71B, the signal system ground line 72B, the drive system power supply line 73B, and the drive system ground line 74B constituting the backbone trunk line portion 61 has a flat cross section. It is composed of a plate-shaped coated electric wire (bus bar) having a shape. Each coated electric wire is composed of a plate-shaped internal conductor 77 having a flat cross-sectional shape and an insulating coating 78 that covers the entire periphery thereof. The insulating coating 78 is made of resin or the like. Therefore, the signal system power supply line 71B, the signal system ground line 72B, the drive system power supply line 73B, and the drive system ground line 74B are electrically separated from each other.

Further, the signal system power supply line 71B, the signal system ground line 72B, the drive system power supply line 73B, and the drive system ground line 74B are arranged in a row and parallel to each other in a state of being stacked in the thickness direction thereof. The drive system power supply line 73B is arranged so as to be sandwiched between the signal system ground line 72B and the drive system ground line 74B.

By arranging in this way, it is possible to suppress electromagnetic noise from being radiated to the outside. That is, since a large current flows through the drive system power supply line 73B, large electromagnetic noise is radiated from the drive system power supply line 73B due to current switching and the like. However, since the potential of the signal system ground line 72B and the potential of the drive system ground line 74B are almost the same as the reference potential of the ground, electromagnetic shielding can be performed, and the signal system ground line 72B and the drive system ground line 74B can be performed. It is possible to reduce the radiation of electromagnetic noise to the outside of the.

In order to fix the signal system power supply line 71B, the signal system ground line 72B, the drive system power supply line 73B, and the drive system ground line 74B in the positional relationship shown in FIG. It is integrated or integrated by covering the outside with an exterior material (not shown). Further, since the current flowing through the signal system power supply line 71B and the signal system ground line 72B is relatively small, the cross-sectional area of the internal conductor 75 in the signal system power supply line 71B and the signal system ground line 72B is the cross-sectional area of the drive system power supply line 73B and the drive system. It may be smaller than the cross-sectional area of the ground line 74B.

<Structure example 3>
4 (a) and 4 (b) show a cross-sectional structure of the backbone trunk line portion 61 in which the positional relationship of each component is different from that of the backbone trunk line portion shown in FIGS. 3 (a) and 3 (b). It is a figure which shows. The backbone trunk line portions 62 and 63 also adopt the same configuration as the backbone trunk line portion 61.

The configuration shown in FIG. 4A also has the same signal system power supply line 71, signal system ground line 72, drive system power supply line 73, and drive system ground line 74 as the configuration shown in FIG. 3A. However, these layouts are different from the configuration shown in FIG. 3 (a).

Specifically, the signal system power supply line 71, the signal system ground line 72, the drive system power supply line 73, and the drive system ground line 74 are arranged in a row and arranged in parallel with each other. The signal system ground line 72 and the drive system ground line 74 are arranged outside, and the signal system power supply line 71 and the drive system power supply line 73 are arranged so as to be sandwiched between them.

By arranging in this way, it is possible to suppress electromagnetic noise from being radiated to the outside. That is, since a large current flows through the drive system power supply line 73, large electromagnetic noise is radiated from the drive system power supply line 73 due to current switching and the like. Further, although it is relatively small, electromagnetic noise is also radiated from the signal system power supply line 71. However, since the potential of the signal system ground line 72 and the potential of the drive system ground line 74 are almost the same as the reference potential of the ground, electromagnetic shielding can be performed, and the signal system ground line 72 and the drive system ground line 74 can be performed. It is possible to reduce the radiation of electromagnetic noise to the outside of the.

In order to fix the signal system power supply line 71, the signal system ground line 72, the drive system power supply line 73, and the drive system ground line 74 in the positional relationship shown in FIG. It is integrated or integrated by covering the outside with an exterior material (not shown).

<Structure example 4>
Also in the configuration shown in FIG. 4 (b), the same signal system power supply line 71B, signal system ground line 72B, drive system power supply line 73B, and drive system ground line 74B as the configuration shown in FIG. 3 (b) are used. However, these layouts are different from the configuration shown in FIG. 3 (b).

Specifically, the signal system power supply line 71B, the signal system ground line 72B, the drive system power supply line 73B, and the drive system ground line 74B are arranged in a row and arranged in parallel with each other in a state of being stacked in the thickness direction thereof. There is. The signal system power supply line 71B and the drive system power supply line 73B are arranged so as to be sandwiched between the signal system ground line 72B and the drive system ground line 74B.

By arranging in this way, it is possible to suppress electromagnetic noise from being radiated to the outside. That is, since a large current flows through the drive system power supply line 73B, large electromagnetic noise is radiated from the drive system power supply line 73B due to current switching and the like. Further, although it is relatively small, electromagnetic noise is radiated from the signal system power supply line 71B. However, since the potential of the signal system ground line 72B and the potential of the drive system ground line 74B are almost the same as the reference potential of the ground, electromagnetic shielding can be performed, and the signal system ground line 72B and the drive system ground line 74B can be performed. It is possible to reduce the radiation of electromagnetic noise to the outside of the.

In order to fix the signal system power supply line 71B, the signal system ground line 72B, the drive system power supply line 73B, and the drive system ground line 74B in the positional relationship shown in FIG. 4B, for example, they are bonded. It is integrated or integrated by covering the outside with an exterior material (not shown).

<Modification example of cross-sectional structure of trunk line>
<Modification 1>
The cross-sectional structure of the backbone trunk line portion 61C is shown in FIG. The backbone trunk line portion 61C shown in FIG. 5 can perform the same function as the backbone trunk line portion 61 having the configuration shown in FIG. 3 (b).

In the backbone trunk line portion 61C shown in FIG. 5, the above-mentioned signal system power supply line 71B, signal system ground line 72B, and drive system power supply line 73B formed in a plate shape are laminated, and the outside thereof is an exterior material (housing). ) Is covered with the drive system ground line 74C. Since this exterior material is made of a conductive metal such as aluminum, it can be used as a conductor for grounding. Further, since this exterior material can easily secure a sufficiently large cross-sectional area, it is suitable as a conductor for grounding through which a large current flows.

As shown in FIG. 5, by covering the outside of the signal system power supply line 71B and the drive system power supply line 73 with the exterior material configured as the drive system ground line 74C, the function of the electromagnetic shield can be effectively performed. That is, since the potential of the drive system ground line 74C is substantially the same as the reference potential of the ground, the electromagnetic noise generated by the current flowing through the drive system power supply line 73 and the like is not radiated to the outside of the backbone trunk line portion 61C.

<Modification 2>
The cross-sectional structures of the backbone trunk lines 61D and 61E are shown in FIGS. 6 (a) and 6 (b), respectively.

As shown in FIG. 6A, the backbone trunk line portion 61D is similar to the backbone trunk line portion 61C in that it has a tubular drive system ground line 74C, but the entire outer periphery of the drive system ground line 74C is an exterior. It differs in that it is covered by the material (housing) 70. The exterior material 70 is made of an insulator such as resin, and is formed in a tubular shape so as to cover the earth line 74C. As a result, not only the same function as that of the backbone trunk line portion 61C can be achieved, but also the outer peripheral exterior material 70 functions as a cover, so that the durability of the backbone trunk line portion 61D can be improved.

Further, the backbone trunk line portion 61E shown in FIG. 6B has the same exterior material 70 as the backbone trunk line portion 61D, and only the cross-sectional shapes of the drive system power supply line, the signal system power supply line, and the signal system ground line are shown. It's different. Therefore, the durability of the backbone trunk line portion 61E can be improved in the same manner as that of the backbone trunk line portion 61D.

<Modification 3>
The cross-sectional structure of the backbone trunk line portion 61F is shown in FIG. The backbone trunk line portion 61F shown in FIG. 7 can also perform the same function as the backbone trunk line portion 61 having the configuration shown in FIG. 3 (b).

In the backbone trunk line portion 61F shown in FIG. 7, the above-mentioned signal system power supply line 71B, drive system power supply line 73B, and drive system ground line 74B formed in a plate shape are laminated, and the outside thereof is covered with an exterior material 70. There is. The exterior material 70 can be made of, for example, a resin, as in the case of the second modification, but may be a conductor.
Further, the outer periphery of the exterior material 70 is covered with a thin conductor (metal such as aluminum) constituting the signal system ground line 72C. The signal system ground line 72 may be arranged along the inner wall of the exterior material 70. Since a large current does not flow through the signal system ground line 72C, it is not necessary to increase the cross-sectional area of this conductor.

As shown in FIG. 7, the signal system ground line 72C is arranged around the exterior material 70 and covers the outside of the signal system power supply line 71B and the drive system power supply line 73 to effectively perform the function of electromagnetic shielding. Can be done. That is, since the potential of the signal system ground line 72C is substantially the same as the reference potential of the ground, the electromagnetic noise generated by the current flowing through the drive system power supply line 73 and the like is not radiated to the outside of the backbone trunk line portion 61F.

<Modification example 4>
The cross-sectional structures of the backbone trunk lines 61G and 61H are shown in FIGS. 8 (a) and 8 (b), respectively.

As shown in FIG. 8A, the backbone trunk line portion 61G has a tubular drive system ground line 74C, and the entire outer periphery of the drive system ground line 74C is covered with an exterior material (housing) 70. , Similar to the backbone trunk line portion 61D shown in Modification 2, but inside the tubular drive system ground line 74C, the signal system power supply line 71, the signal system ground line 72, the drive system power supply line 73, and the drive system ground. It differs from the backbone trunk line portion 61D in that it has four lines of the line 74.

That is, the backbone trunk line portion 61G has two drive system ground lines 74 having a circular cross-sectional shape and a tubular drive system ground line 74C as drive system ground lines. As a result, the total cross-sectional area of the ground line can be secured wider, so that not only is it suitable as a conductor for grounding through which a large current flows, but also the drive system ground line 74C is the signal system power supply line 71 and the drive system power supply line. By covering the outside of the 73, the function of the electromagnetic shield can be effectively performed.

Further, the backbone trunk line portion 61H shown in FIG. 8B has a tubular drive system ground line 74C and a drive system power supply line, a signal system power supply line, and a signal system ground line surrounded by the tubular drive system ground line 74C, similarly to the backbone trunk line portion 61G. And has a drivetrain ground line, only these cross-sectional shapes are different. Therefore, also in the backbone trunk line portion 61H, the drive system ground line 74C is not only suitable as a conductor for grounding through which a large current flows, but also covers the outside of the signal system power supply line 71 and the drive system power supply line 73. It can also effectively serve as an electromagnetic shield.

(Second Embodiment)
It is a wiring diagram which shows the in-vehicle device including the circuit body for a vehicle in 2nd Embodiment of this invention. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the in-vehicle device shown in FIG. 9, the power supply lines 79 of the backbone trunk lines 61B, 62B, 63B are commonly used by the drive system auxiliary machines 81, 83, 85 and the signal system auxiliary machines 82, 84, 86. It is configured as follows. That is, the signal system power supply line 71 and the drive system power supply line 73 shown in FIG. 2 are replaced with a common power supply line 79. Further, the power distribution unit in the backbone control boxes 64B, 65B, and 66B also has a common signal system and drive system.

In the configuration shown in FIG. 9, since the power supply line 79 is commonly used in the signal system and the drive system, the signal system is affected by the voltage drop due to the influence of the large current flowing through the drive system accessories 81, 83, and 85. The power supply voltage applied to the auxiliary machines 82, 84, 86 may decrease. However, since the line on the ground side is independent of the signal system and the drive system as in the configuration shown in FIG. 2, the ground potential of the signal system accessories 82, 84, and 86 may be affected by a large current. It is possible to prevent the occurrence of malfunction in the signal system auxiliary equipment.

Each of the backbone trunk lines 61B, 62B, and 63B shown in FIG. 9 is composed of three lines, a power supply line 79, a signal system ground line 72, and a drive system ground line 74. Therefore, for example, FIG. 10A is shown. , FIG. 10 (b), FIG. 11 (a), and FIG. 11 (b) can be adopted.

In the configuration shown in FIG. 10A, each of the power supply line 79, the signal system ground line 72, and the drive system ground line 74 constituting the backbone trunk line portion 61B is composed of a covered electric wire having a circular cross-sectional shape. There is. Each coated electric wire is composed of an internal conductor 75 having a circular cross-sectional shape and an insulating coating 76 that covers the entire periphery thereof. The insulating coating 76 is made of resin or the like. Therefore, the power supply line 79, the signal system ground line 72, and the drive system ground line 74 are electrically separated from each other.

Further, the power supply line 79, the signal system ground line 72, and the drive system ground line 74 are arranged in a row and arranged in parallel with each other. The power supply line 79 is arranged so as to be sandwiched between the signal system ground line 72 and the drive system ground line 74.

By arranging in this way, it is possible to suppress electromagnetic noise from being radiated to the outside. That is, since a large current flows through the power supply line 79, large electromagnetic noise is radiated from the power supply line 79 due to current switching and the like. However, since the potential of the signal system ground line 72 and the potential of the drive system ground line 74 are almost the same as the reference potential of the ground, electromagnetic shielding can be performed, and the signal system ground line 72 and the drive system ground line 74 can be performed. It is possible to reduce the radiation of electromagnetic noise to the outside of the.

In order to fix the power supply line 79, the signal system ground line 72, and the drive system ground line 74 in the positional relationship shown in FIG. 10A, they are integrated by, for example, or an exterior (not shown). It is integrated by covering the outside with a material. Further, since the current flowing through the signal system ground line 72 is relatively small, the cross-sectional area of the internal conductor 75 in the signal system ground line 72 can actually be smaller than that of the drive system ground line 74.

In the configuration shown in FIG. 10B, each of the power supply line 79B, the signal system ground line 72B, and the drive system ground line 74B constituting the backbone trunk line portion 61B is formed by a plate-shaped coated electric wire having a flat cross section. It is configured. Each coated electric wire is composed of a plate-shaped internal conductor 77 having a flat cross-sectional shape and an insulating coating 78 that covers the entire periphery thereof. The insulating coating 78 is made of resin or the like. Therefore, the power supply line 79B, the signal system ground line 72B, and the drive system ground line 74B are electrically separated from each other.

Further, the power supply line 79B, the signal system ground line 72B, and the drive system ground line 74B are arranged in a row and arranged in parallel with each other in a state of being laminated in the thickness direction thereof. The power supply line 79B is arranged so as to be sandwiched between the signal system ground line 72B and the drive system ground line 74B.

By arranging in this way, it is possible to suppress electromagnetic noise from being radiated to the outside. That is, since a large current flows through the power supply line 79B, large electromagnetic noise is radiated from the power supply line 79B due to current switching and the like. However, since the potential of the signal system ground line 72B and the potential of the drive system ground line 74B are almost the same as the reference potential of the ground, electromagnetic shielding can be performed, and the signal system ground line 72B and the drive system ground line 74B can be performed. It is possible to reduce the radiation of electromagnetic noise to the outside of the.

In order to fix the power supply line 79B, the signal system ground line 72B, and the drive system ground line 74B in the positional relationship shown in FIG. 10B, they are integrated by, for example, or an exterior (not shown). It is integrated by covering the outside with a material. Further, since the current flowing through the signal system ground line 72B is relatively small, the cross-sectional area of the internal conductor 75 in the signal system ground line 72B can actually be smaller than that of the drive system ground line 74B.

In the configuration shown in FIG. 11A, the signal system ground line 72, the drive system ground line 74, and the power supply line 79 are arranged side by side in a row. Further, the signal system ground line 72 is arranged at the left end of this row, the drive system ground line 74 is arranged at the center, and the power supply line 79 is arranged at the right end.

In the configuration of FIG. 11A, it is assumed that the power supply line 79 is arranged at a position close to, for example, the surface of the vehicle body or the surface of the auxiliary machine. Therefore, the signal system ground line 72 and the drive system ground line 74 are arranged at positions on the outer side far from the surface of the vehicle body or the like. Therefore, the electromagnetic shielding function of the signal system ground line 72 and the drive system ground line 74 can reduce the radiation of electromagnetic noise radiated from the power supply line 79 to the outside.

In the configuration shown in FIG. 11B, the signal system ground line 72B, the drive system ground line 74B, and the power supply line 79B are arranged in a row in the thickness direction and stacked. Further, the signal system ground line 72B is arranged at the uppermost part of this row, the drive system earth line 74B is arranged at the center, and the power supply line 79B is arranged at the lowermost part.

In the configuration of FIG. 11B, it is assumed that the lowermost power supply line 79B is arranged at a position close to, for example, the surface of the vehicle body or the surface of the auxiliary machine. Therefore, the signal system ground line 72B and the drive system ground line 74B are arranged at positions on the outer side far from the surface of the vehicle body or the like. Therefore, the electromagnetic shielding function of the signal system ground line 72B and the drive system ground line 74B can reduce the electromagnetic noise radiated from the power supply line 79B to the outside.

<Modification 1 of the second embodiment>
The cross-sectional structures of the backbone trunk lines 61J and 61K are shown in FIGS. 12 (a) and 12 (b), respectively.
As shown in FIG. 12A, the backbone trunk line portion 61J is shown in FIG. 10 in that the signal system power supply line 71 and the drive system power supply line 73 shown in FIG. 2 are replaced with a common power supply line 79. It is similar to the configuration of the backbone trunk line portion 61B, but differs from the backbone trunk line portion 61B in that it has a tubular drive system ground line 74C instead of a circular cross section. Further, it is different from the backbone trunk line portion 61B in that the entire outer circumference of the drive system ground line 74C is covered with the exterior material (housing) 70. The exterior material 70 is made of an insulator such as resin, and is formed in a tubular shape so as to cover the earth line 74C.

As a result, not only the same function as that of the backbone trunk line portion 61C can be achieved, but also the outer peripheral exterior material 70 functions as a cover, so that the durability of the backbone trunk line portion 61J can be improved. Further, since only the signal system ground line 72 and the power supply line 79 are housed in the pipe formed by the ground line 74C, the cross-sectional area of the backbone trunk line portion 61J can be further reduced.

Further, the backbone trunk line portion 61K shown in FIG. 12B has the same exterior material 70 as the backbone trunk line portion 61J, and only the cross-sectional shapes of the power supply line and the signal system ground line are different. Therefore, the same effect as that of the backbone trunk line portion 61J can be obtained in the backbone trunk line portion 61K.

<Other variants>
In the vehicle-mounted device shown in FIG. 2, both the signal system ground line 72 and the drive system ground line 74 are included inside the backbone trunk lines 61 to 63. However, in the case of an in-vehicle device mounted on a vehicle whose vehicle body is made of metal, it is also possible to use body ground. When the body ground can be used, either the signal system ground line 72 or the drive system ground line 74 in the backbone trunk line portions 61 to 63 can be replaced with the body ground.

<Advantages of vehicle circuit body>
In any of the above configurations, the signal system ground line 72 and the drive system ground line 74 that are independent of each other are provided, and the ground of the drive system auxiliary machine 81 and the signal system auxiliary machine 82 are separated from each other to supplement the signal system. It is possible to prevent the ground potential of the machine 82 from floating or fluctuating from the reference potential, and it is possible to prevent the signal system auxiliary machine 82 from malfunctioning. Further, since it is possible to suppress a decrease in the power supply voltage applied to the signal system auxiliary device 82, it is possible to avoid a decrease in the performance of the signal system auxiliary device 82 as compared with the rating. Further, as shown in FIG. 2, by separating the drive system auxiliary device 81 and the signal system auxiliary device 82 in the power supply line, it is possible to further suppress a decrease in the power supply voltage applied to the signal system auxiliary device 82.

Here, the features of the above-described embodiment of the vehicle circuit body according to the present invention are briefly summarized and listed below in [1] to [6], respectively.
[1] A vehicle circuit body installed in a vehicle.
It is equipped with a trunk line (backbone trunk line portions 61 to 63) that can be connected to a plurality of auxiliary machines mounted on the vehicle via a branch line or a branch circuit.
The trunk line
A power supply line (signal system power supply line 71, drive system power supply line 73, power supply line 79) capable of distributing power from the power supply mounted on the vehicle and supplying the power to each of the plurality of auxiliary machines.
A ground line that can be electrically connected between the ground terminal of the power supply and the plurality of auxiliary machines.
A communication line shared by a plurality of the auxiliary machines having a communication function as a signal transmission line is provided.
The ground line includes a first ground line (drive system ground line 74) connected to an auxiliary machine (drive system auxiliary machines 81, 83, 85) through which a large current flows among the plurality of auxiliary machines, and the large current. A vehicle circuit body comprising a second ground line (signal system ground line 72) connected to an auxiliary machine through which a smaller current flows.

[2] The power supply line is a first power supply line (drive system power supply line 73) that supplies electric power to the auxiliary equipment (drive system auxiliary equipment 81, 83, 85) through which the large current flows, and the power supply line is larger than the large current. The vehicle according to the above [1], which includes a second power supply line (signal system power supply line 71) for supplying electric power to auxiliary equipment (signal system auxiliary equipment 82, 84, 86) through which a small current flows. Circuit body.

[3] The first ground line and the second ground line are electrically insulated from each other and arranged side by side on the same wiring path in a state of being substantially parallel to each other (see FIG. 3).
The vehicle circuit body according to the above [1] or [2].

[4] The power supply line is arranged in a space sandwiched between the first ground line and the second ground line (see FIG. 3).
The vehicle circuit body according to the above [3].

[5] The second ground line is arranged at an outer position where the distance from the vehicle body surface of the vehicle is farther than the power supply line and the first ground line (see FIG. 4).
The vehicle circuit body according to the above [3].

[6] The first ground line is formed in a tubular shape.
The vehicle circuit body according to the above [1] or [2], wherein the power supply line and the second ground line are arranged in a pipe of the first ground line.

10 Power supply 10a Positive electrode side terminal 10b Negative electrode side terminal 11 Engine room 12 Instrument panel section 13 Vehicle room 16 Dash panel 16a Through hole 21,22,23 Backbone trunk line section 31,32,33 Backbone control box 31a Main power supply connection section 31b Trunk line connection section 31c Branch line connection 41 Main power cable 42, 43, 44 Branch line sub-harness 51, 52, 53 Electronic control unit 61, 61B, 61C, 61D, 61E, 61F, 61G, 61H, 61J, 61K, 62, 62B, 63, 63B Backbone Trunk line 64,64B, 65,65B, 66,66B Backbone control box 70 Exterior material 71,71B Signal system power supply line 72,72B Signal system ground line 73,73B Drive system power supply line 74, 74B, 74C drive System ground line 75,77 Internal conductor 76,78 Insulation coating 79 Power line 81,83,85 Drive system auxiliary equipment 82,84,86 Signal system auxiliary equipment

Claims (3)

It is a vehicle circuit body installed in a vehicle.
It is equipped with a trunk line that can be connected to a plurality of auxiliary equipment mounted on the vehicle via a branch line or a branch circuit.
The trunk line
A power supply line that can distribute electric power from the power supply mounted on the vehicle and supply it to each of the plurality of auxiliary machines.
A ground line that can be electrically connected between the ground terminal of the power supply and the plurality of auxiliary machines.
A communication line shared by a plurality of the auxiliary machines having a communication function as a signal transmission line is provided.
The ground line includes a first ground line connected to an auxiliary machine through which a large current flows among the plurality of the auxiliary machines, and a second ground line connected to an auxiliary machine through which a current smaller than the large current flows. Including
The power supply line includes a first power supply line that supplies power to the auxiliary machine through which the large current flows, and a second power supply line that supplies power to the auxiliary equipment through which a current smaller than the large current flows.
It is determined that only the first power supply line among the first power supply line and the second power supply line is arranged in the space sandwiched between the first ground line and the second ground line. A characteristic vehicle circuit body. Claim 1 is characterized in that the first ground line and the second ground line are electrically insulated from each other and arranged side by side in a state of being substantially parallel to each other on the same wiring path. The vehicle circuit body described in . It is a vehicle circuit body installed in a vehicle.
It is equipped with a trunk line that can be connected to a plurality of auxiliary equipment mounted on the vehicle via a branch line or a branch circuit.
The trunk line
A power supply line that can distribute electric power from the power supply mounted on the vehicle and supply it to each of the plurality of auxiliary machines.
A ground line that can be electrically connected between the ground terminal of the power supply and the plurality of auxiliary machines.
A communication line shared by a plurality of the auxiliary machines having a communication function as a signal transmission line is provided.
The ground line includes a first ground line connected to an auxiliary machine through which a large current flows among the plurality of the auxiliary machines, and a second ground line connected to an auxiliary machine through which a current smaller than the large current flows. Including
The first ground line and the second ground line are electrically insulated from each other and arranged side by side on the same wiring path in a state of being substantially parallel to each other.
A vehicle circuit characterized in that the second ground line is arranged at an outer position where the distance from the surface of the vehicle body is farther than the power supply line and the first ground line. body.

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