WO2018021547A1

WO2018021547A1 - Vehicular circuit unit

Info

Publication number: WO2018021547A1
Application number: PCT/JP2017/027497
Authority: WO
Inventors: 大亮八木
Original assignee: 矢崎総業株式会社
Priority date: 2016-07-29
Filing date: 2017-07-28
Publication date: 2018-02-01
Also published as: CN109661329A; CN109661329B

Abstract

In the present invention, a driving system earth line (74) for grounding driving system accessories (81, 83, 85) in which large currents flow, and a signal system earth line (72) for grounding signal system accessories (82, 84, 86) in which small currents flow, are provided independent of each other, on backbone main lines (61-63). It is possible to prevent excitation of earth potentials of the signal system accessories (82, 84, 86) from a reference potential or voltage fluctuation-induced malfunction, which are caused by a voltage drop in the earth path due to the influence of a large current. Further, a signal system power line (71) and a driving system power line (73) which are independent of each other are provided to suppress a decrease in a power supply voltage. In addition, the influence of electromagnetic noise caused by a large current is reduced.

Description

Circuit body for vehicle

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

Conventionally, various types of electrical equipment called auxiliary machines are mounted on various parts of the vehicle body. Most of such auxiliary machines require supply of power. In some cases, communication is performed between a plurality of auxiliary machines, and signals from switches, sensors, and the like are transmitted.

Therefore, in a general vehicle, wire harnesses, which are aggregates of a large number of electric wires, are routed at various locations on the vehicle body. And using this wire harness, the power supply (battery and alternator) on a vehicle and each auxiliary machine are connected, or between auxiliary machines is connected.

Regarding the ground connection, since the vehicle body is made of a conductive metal in a general vehicle, the vehicle body 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 grounding cannot be used, and thus a member for ground connection needs to be prepared.

The wire harness disclosed in Patent Document 1 includes a power line, a communication line, and an earth line on the main line. Therefore, each auxiliary machine can be connected to the vehicle-side ground using the ground line on the trunk line without using the body ground.

Further, Patent Document 2 discloses a wiring structure of a wire harness in which a long grounding member having an L-shaped cross section is provided and the wire harness is disposed at a position adjacent to the grounding member. Therefore, each auxiliary machine can be connected to the ground using the ground member in the vicinity of the wire harness without incorporating the ground line into the wire harness.

Japanese Unexamined Patent Publication No. 2015-227089 Japanese Unexamined Patent Publication No. 2016-111826

By the way, since the electrical resistance also exists in the ground line, a relatively large voltage drop occurs particularly when a large power supply current flows to the ground. Also, a large voltage drop occurs at a location where current is concentrated. Therefore, the potential at the connection point between each auxiliary machine and the earth line varies for each auxiliary machine.

For example, when the vehicle body ground 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 prevented from being adversely affected by the generated voltage drop. However, when using an earth line or a special earth member incorporated in the wire harness, there is a possibility that a voltage drop at the earth will occur because there may be a case where a sufficient cross-sectional area of the path through which the earth current passes may not be secured. Become.

In the configuration example shown in FIG. 13, a signal system load 102 and a drive system load 103 are connected to a power supply line connected to the positive terminal of the battery 101. In addition, the ground terminal of the signal system load 102 and the ground terminal of the drive system load 103 are connected to different parts of the common ground structure 104, respectively, and this ground structure 104 is connected to the negative terminal of the battery 101. Has been. Here, the potential change (floating relative to the reference potential of ground (GND)) V11 and the potential change V12 of the drive system load ground point on the ground structure 104 are expressed by the following equations.

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

That is, since both the currents I1s and I1p pass through the ground path of the signal system load 102 in common, even if the current I1s is small, a large potential change V11 occurs when the current I1p is large. Actually, 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, which is large. A potential change V11 occurs.

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

Further, if the ground electrical resistances Z11 and Z12 are large, the power supply voltage applied between the terminals of the drive system load 103 is reduced by the voltage drop (V11 + V12), so that the output of the drive system load 103 is reduced, Performance cannot be obtained. Further, not only the ground but also the power supply line side similarly causes a voltage drop according to the current.

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

The present invention has been made in view of the above-described circumstances, and the purpose of the present invention is to prevent the malfunction of an auxiliary machine and the auxiliary machine even when a large current flows from a power source on the vehicle to various auxiliary machines. An object of the present invention is to provide a vehicular circuit body capable of suppressing the performance degradation.

In order to achieve the above-described object, a vehicle circuit body according to the present invention is characterized by the following (1) to (6).
(1) A vehicle circuit body installed in a vehicle,
A trunk line that can be connected to a plurality of auxiliary machines mounted on the vehicle via branch lines or branch circuits,
The trunk line is
A power line capable of distributing power from a power source mounted on the vehicle and supplying each of the plurality of auxiliary machines;
An earth line capable of being electrically connected between the ground terminal of the power source and the plurality of auxiliary machines;
A plurality of auxiliary devices having a communication function, and a communication line shared as a signal transmission path,
The ground line includes a first ground line connected to an auxiliary machine through which a large current flows among the plurality of auxiliary machines, and a second ground line connected to an auxiliary machine through which a current smaller than the large current flows. Including a vehicle circuit body.

(2) 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 machine through which a current smaller than the large current flows. The vehicle circuit body according to (1).

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

(4) The vehicle circuit body according to (3), wherein the power supply line is arranged in a space sandwiched between the first ground line and the second ground line.

(5) In the above (3), the second ground line is disposed at an outer position where the distance from the surface on the vehicle body of the vehicle is farther than the power line and the first ground line. The circuit body for vehicles as described.

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

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 machine are Since it is provided in an independent state, it is possible to suppress malfunction of the auxiliary machine. That is, since a large current flows only in the first ground line and a small current flows in the second ground line, 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 earth line is small and the conductor of this path does not need to have a large cross-sectional area, the trunk line can be provided even when both the first earth line and the second earth line are provided. Can be prevented.

According to the vehicle circuit body having the configuration (2), 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 machine are independent. Therefore, it is possible to prevent a decrease in the power supply voltage applied between the terminals of the auxiliary machine having a small current. Further, since the current flowing through the second power supply line is small and the conductor of this path does not need to have a large cross-sectional area, the trunk line can be provided even when both the first power supply line and the second power supply line are provided. Can be prevented.

According to the vehicle circuit body having the configuration of (3) above, the first ground line and the second ground line are arranged side by side on the main line, so that the vehicle body ground or a special ground member cannot be used. Even in the environment, various types of auxiliary machines can be connected to the ground using the trunk line.

According to the vehicle circuit body configured as described in (4) above, the first ground line and the second ground line are connected to the negative side (ground side) of the power source, so that they can be used as electromagnetic shields. That is, the electromagnetic noise radiated from the power supply line due to the current can be shielded from being radiated outside the first ground line and outside the second ground line. The adverse effects of noise on the machine can be avoided.

According to the vehicle circuit body configured as described in (5) above, the second ground line that is hardly changed in potential is arranged at the outermost position, so that the second ground line can be used as an electromagnetic shield. That is, the electromagnetic noise radiated by the current from the power supply line or the first ground line reduces the radiation to the outside of the second ground line, so that it is possible to avoid the adverse effect of the noise on the external auxiliary equipment.

According to the vehicle circuit body having the configuration (6), the voltage drop generated in the first ground line is suppressed while suppressing the enlargement of the main line by making the first ground line through which a large current flows into a tubular shape. it can. Furthermore, since the first ground line can be used as an electromagnetic shield, electromagnetic noise radiated by the current from the power supply line can be shielded from being radiated outside the first ground line. The adverse effect of noise on the installed auxiliary equipment can be avoided.

According to the vehicle circuit body of the present invention, even when a large current flows from the power source on the vehicle to various auxiliary machines, malfunctions may occur in the auxiliary machine with a small current, or the power supply voltage to be applied It is possible to suppress the deterioration of the performance of the auxiliary machine due to the decrease.

The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through a mode for carrying out the invention described below (hereinafter referred to as “embodiment”) with reference to the accompanying drawings. .

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

Specific embodiments relating to the present invention will be described below with reference to the drawings.

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

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

The on-vehicle apparatus shown in FIG. 1 represents the configuration on the vehicle interior side in the vicinity of the dash panel 16 that partitions the engine room 11 and the vehicle compartment (passenger compartment) 13 of the vehicle body. A lean hose (not shown), which is a reinforcing material, is installed in an instrument panel portion (instrument panel portion) 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 disposed 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 portions

21, 22, and 23 and a plurality of

backbone control boxes

31, 32, and 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 the earth line in each backbone trunk part, for example, a strip-shaped metal material (for example, copper or aluminum) having a flat cross-sectional shape is employed, and these metal materials are electrically insulated from each other in the thickness direction. It is configured to be laminated. Thereby, passage of a large current can be permitted, and bending in the thickness direction is relatively easy.

The

backbone trunk portions

21 and 22 are linearly arranged in the left-right direction at positions along the surface of the dash panel 16 so as to be substantially parallel to the lean hose at a position above the lean hose. Further, the backbone trunk portion 23 is disposed at a substantially central portion in the left-right direction of the vehicle body, and linearly extends in the vertical direction at a location along the surface of the dash panel 16. Further, the backbone trunk portion 23 is bent in the thickness direction by approximately 90 degrees in the vicinity of the boundary between the dash panel 16 and the vehicle interior floor, and is disposed so as to extend in the front-rear direction of the vehicle body along the vehicle interior floor. In addition, 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 disposed at the substantially central portion in the left-right direction of the vehicle body, the backbone control box 31 is disposed near the left end in the left-right direction, and the backbone control box 33 is disposed near the right end in the left-right direction.

The left end of the backbone main line 21 is connected to the right end of the backbone control box 31, and the right end of the backbone main line 21 is connected to the left end of the backbone control box 32. Further, the left end of the backbone trunk portion 22 is connected to the right end of the backbone control box 32, and the right end of the backbone trunk portion 22 is connected to the left end of the backbone control box 33. The front end of the backbone trunk 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 formed in 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 where they can be electrically connected to each other via the backbone control box 32.

The backbone control box 31 disposed on the left side of the vehicle body includes a main power supply connection part 31a, a main line connection part 31b, and a branch line connection part 31c. As shown in FIG. 1, the main power cable 41 is connected to the main power connection part 31a of the backbone control box 31, the left end of the backbone main line part 21 is connected to the main line connection part 31b, and the branch line connection part 31c is connected to the branch line connection part 31c. A plurality of branch line sub-harnesses 42 are connected to each other. In FIG. 1, the branch line sub-harness 42 is shown detached from the backbone control box 31 in order to represent that the branch line sub-harness 42 can be attached to and detached from the backbone control box 31.

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

In the backbone control box 31, the power supply system, the ground system, and the communication system of each circuit are mutually connected and the power is distributed among the main power cable 41, the backbone trunk section 21, and the branch line subharness 42. A circuit board is included.

For the main power cable 41, the terminals connected to the respective ends of the power line and the earth line are connected to the terminals of the main power connection part 31a, and these circuits are connected by fixing them with bolts and nuts. Can do.

The branch line sub-harness 42 is provided with a connector that can be attached to and detached from the branch line connection portion 31c at each end, and the circuit of the branch line sub-harness 42 can be connected as necessary. Each of the branch line sub-harnesses 42 is configured to include all or a part of the power supply line, the earth line, and the communication line. In the backbone control box 31 shown in FIG. 1, the branch line connecting portion 31c is provided with six connectors, and up to six branch line sub-harnesses 42 can be connected.

As shown in FIG. 1, the backbone trunk portions 21 to 23 and the backbone control boxes 31 to 33 are combined, and various branch line sub-harnesses 42 to 44 are connected to the backbone control boxes 31 to 33, whereby the backbone (backbone) is obtained. With a simple structure similar to), various transmission lines can be routed. In other words, the vehicle circuit body according to the embodiment of the present invention is configured as a backbone in which the backbone trunk lines 21 to 23 and the backbone control boxes 31 to 33 function as a backbone part related to power distribution and communication transmission. The branch sub-harness is appropriately connected to the backbone.

For example, various electrical components mounted on the vehicle as an option or addition can be handled by adding or changing the branch 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 main circuit body. In the present embodiment, it is assumed that the branch line sub-harnesses 42 to 44 are connected to the backbone control boxes 31 to 33. For example, another branch point is provided at an appropriate relay point on the backbone trunks 21 to 23. A line branch line sub-harness (not shown) may be connected.

In an actual in-vehicle device, for example, as shown in FIG. 1, an auxiliary machine such as an electronic control unit (ECU) 51 provided in the vehicle via a branch line sub-harness 42 is connected to a backbone control box 31 or other electrical equipment. 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. Furthermore, various electrical components can be connected to the backbone control box 33 via the branch line sub-harness 44. Each

electronic control unit

51, 52, 53 can control various electrical components on the vehicle via the communication lines of the

branch sub-harnesses

42, 43, 44, the backbone control boxes 31 to 33, and the like. it can.

Next, a specific example of the circuit configuration will be described.
FIG. 2 shows a configuration example of an in-vehicle device including the vehicle circuit body in the first embodiment of the present invention. The in-vehicle device shown in FIG. 2 includes

backbone trunks

61, 62, 63,

backbone control boxes

64, 65, 66, and a plurality of drive system auxiliary machines 81 (1) to 81 (N), 83 (1) to 83 ( N), 85 (1) to 85 (N), a plurality of signal system auxiliary devices 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

backbone backbone portions

61, 62, and 63 includes four independent lines of signal system power supply line 71, signal system ground line 72, drive system power supply line 73, and drive system ground line 74. It has.

Each of the signal power line 71 and the signal ground line 72 consumes a relatively small power supply current. For example, an auxiliary machine having a rated current of 10 [A] or less (referred to as “signal auxiliary machine” in this embodiment). A power line and a ground line prepared for supplying power to the power source. For example, a meter unit, an audio device, various electronic control units (ECUs), a small lighting device, and the like mounted on the vehicle correspond to the “signal auxiliary device”.

On the other hand, each of the drive system power line 73 and the drive system ground line 74 consumes a very large power supply current. For example, an auxiliary machine whose rated current exceeds 10 [A] (in this embodiment, “drive system auxiliary machine”). A power line and an earth line prepared for supplying power to the power source. For example, electric motors, various heaters, headlights, and the like for generating driving forces of various actuators on the vehicle correspond to “driving system auxiliary machines”.

Since the drive system power line 73 and the drive system ground line 74 are connected to various accessories classified as “drive system auxiliary machines”, the current of the entire drive system vehicle is about 200 to 300 [A] at the peak time. The large current becomes. On the other hand, the signal system power line 71 and the signal system ground line 72 are connected only to auxiliary devices classified as “signal system auxiliary machines” that consume less current than the drive system. The peak value of the current flowing through the line 72 is much smaller than that of the drive system power line 73 and the drive system ground line 74.

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

Each of the signal system power line 71, the signal system ground line 72, the drive system power line 73, and the drive system ground line 74 included in the backbone trunk section 61 corresponds to that included in the backbone trunk section 62. Connected to the line. Each of the signal system power line 71, the signal system ground line 72, the drive system power line 73, and the drive system ground line 74 included in the backbone trunk 61 is routed through an internal circuit of the backbone control box 64. Are connected to corresponding lines included in the backbone trunk part 63.

Inside each of the

backbone control boxes

64, 65, and 66, as shown in FIG. 2, a signal power distribution unit, a signal GND (ground or ground) distribution unit, a drive power distribution unit, and A drive system GND distributor is provided. The signal system power distribution unit is connected to the signal system power line 71, the signal system GND distribution unit is connected to the signal system ground line 72, the drive system power distribution unit is connected to the drive system power line 73, The drive system GND distributor 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. Each of these auxiliary machines is connected to the backbone control box 64 via a branch line subharness.

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. Also, 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 line 73 to each of a plurality of paths. Then, each 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 subharness. Also on the ground side, the drive system ground line 74 is branched into a plurality of current paths by the GND distribution unit of the drive system. Each of the plurality of branched current paths is connected to the ground terminal of each of drive system auxiliary machines 81 (1) to 81 (N) via a branch line subharness.

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

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

In the backbone control box 65, the signal power distribution unit distributes the power of the signal power line 71 to each of the plurality of paths. Then, each 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 subharness. Also on the ground side, the signal system GND distribution unit branches the signal system ground line 72 into a plurality of current paths. Each of the plurality of branched current paths is connected to the ground terminal of each of signal system auxiliary machines 84 (1) to 84 (N) via the branch line subharness.

Also in the backbone control box 66, the power distribution unit of the drive system distributes the power of the drive system power line 73 to each of a plurality of paths. Each 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 subharness. Further, the drive system ground line 74 is branched into a plurality of current paths by the GND distribution unit of the drive system. Each of the plurality of branched current paths is connected to the ground terminal of each of drive system auxiliary machines 85 (1) to 85 (N) via the branch line subharness.

Also, in the backbone control box 66, the signal power distribution unit distributes the power of the signal power line 71 to each of a plurality of paths. Then, each power distributed by the signal power distribution unit is supplied to each power terminal of each of the signal auxiliary machines 86 (1) to 86 (N) via the branch sub-harness. Also on the ground side, the signal system GND distribution unit branches the signal system ground line 72 into a plurality of current paths. Each of the plurality of branched current paths is connected to the respective ground terminals of the signal system auxiliary machines 86 (1) to 86 (N) via the branch line subharness.

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

That is, the signal system and the drive system are completely independent of both the supply current supply path for each auxiliary machine and the path through which the ground current flows. Therefore, in any current path on the

backbone trunk lines

61, 62, 63, the drive system auxiliary devices 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 through N) is the current of the signal system auxiliary equipment 82 (1) to 82 (N), 84 (1) to 84 (N), 86 (1) to 86 (N). 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 machine 81 (1 ) To 81 (N), 83 (1) to 83 (N), and 85 (1) to 85 (N).

Therefore, each of the voltage drop in the signal system power line 71 and the voltage drop in the signal system ground line 72 is reduced to an acceptable level even when the cross-sectional area of the conductor of each line is relatively small. Therefore, the ground potential of each of the signal system auxiliary machines 82 (1) to 82 (N), 84 (1) to 84 (N), 86 (1) to 86 (N) is the ground reference potential, that is, the power source 10 It can be prevented that the potential of the negative terminal 10b increases or fluctuates. Thereby, it is possible to prevent the malfunction of each signal auxiliary machine 82.

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

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

Next, a specific configuration example of the backbone trunk part will be described.
FIG. 3A and FIG. 3B are diagrams showing a cross-sectional structure of the backbone trunk portion 61 having two power supply lines. Note that FIG. 3A and FIG. 3B are different in the cross-sectional shapes of the power supply line and the communication line that constitute the backbone trunk part 61.

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

Further, the signal system power line 71, the signal system ground line 72, the drive system power line 73, and the drive system ground line 74 are arranged in a row and arranged in parallel to each other. A drive system power supply line 73 is disposed between the signal system ground line 72 and the drive system ground line 74.

This arrangement can suppress electromagnetic noise from being radiated to the outside. That is, since a large current flows through the drive system power supply line 73, a large electromagnetic noise is radiated from the drive system power supply line 73 along with the switching of the current. However, since the potential of the signal system ground line 72 and the potential of the drive system ground line 74 are substantially the same as the ground reference potential, electromagnetic shielding can be performed. The signal system ground line 72 and the drive system ground line 74 can be shielded. The radiation of electromagnetic noise to the outside can be reduced.

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 by covering the outside with an exterior material (not shown). Further, since the current flowing through the signal system power 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 line 71 and the signal system ground line 72 is determined as the drive system power line 73 and the drive system. The cross sectional area of the earth line 74 may be smaller.

<Configuration 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 portion 61 has a flat cross section. It is comprised by the plate-shaped covered electric wire (bus bar) which has a shape. Each covered electric wire includes a plate-like inner conductor 77 having a flat cross-sectional shape and an insulating coating 78 covering the entire periphery thereof. The insulating coating 78 is made of resin or the like. Therefore, the signal system power line 71B, the signal system ground line 72B, the drive system power line 73B, and the drive system ground line 74B are electrically isolated 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 in parallel with each other in a stacked state in the thickness direction thereof. The drive system power line 73B is arranged in a state of being sandwiched between the signal system ground line 72B and the drive system ground line 74B.

This arrangement can suppress electromagnetic noise from being radiated to the outside. That is, since a large current flows through the drive system power supply line 73B, a large electromagnetic noise is radiated from the drive system power supply line 73B when the current is switched. However, since the potential of the signal system ground line 72B and the potential of the drive system ground line 74B are substantially the same as the ground reference potential, electromagnetic shielding can be performed. The signal system ground line 72B and the drive system ground line 74B The radiation of electromagnetic noise to the outside can be reduced.

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 by covering the outside with an exterior material (not shown). Further, since the current flowing through the signal system power 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 line 71B and the signal system ground line 72B is set to the drive system power line 73B and the drive system. You may make it smaller than the cross-sectional area of the earth line 74B.

<Configuration example 3>
4 (a) and 4 (b) are cross-sectional views of the backbone trunk portion 61 in which the positional relationship of each component is different from the backbone trunk portion shown in FIGS. 3 (a) and 3 (b). FIG. The

backbone trunk lines

62 and 63 have the same configuration as that of the backbone trunk line 61.

4A 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.

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 line in parallel with each other. Then, the signal system ground line 72 and the drive system ground line 74 are arranged outside, and the signal system power line 71 and the drive system power line 73 are arranged between them.

This arrangement can suppress electromagnetic noise from being radiated to the outside. That is, since a large current flows through the drive system power supply line 73, a large electromagnetic noise is radiated from the drive system power supply line 73 along with the switching of the current. Although relatively small, electromagnetic noise is also radiated from the signal power line 71. However, since the potential of the signal system ground line 72 and the potential of the drive system ground line 74 are substantially the same as the ground reference potential, electromagnetic shielding can be performed. The signal system ground line 72 and the drive system ground line 74 can be shielded. The radiation of electromagnetic noise to the outside can be reduced.

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

<Configuration example 4>
Also in the configuration shown in FIG. 4B, 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. 3B are used. However, these layouts are different from the configuration shown in FIG.

Specifically, the signal system power line 71B, the signal system ground line 72B, the drive system power line 73B, and the drive system ground line 74B are stacked in the thickness direction and arranged in a row and arranged in parallel to each other. Yes. The signal system power line 71B and the drive system power line 73B are arranged in a state sandwiched between the signal system ground line 72B and the drive system ground line 74B.

This arrangement can suppress electromagnetic noise from being radiated to the outside. That is, since a large current flows through the drive system power supply line 73B, a large electromagnetic noise is radiated from the drive system power supply line 73B when the current is switched. Although relatively small, electromagnetic noise is also radiated from the signal power line 71B. However, since the potential of the signal system ground line 72B and the potential of the drive system ground line 74B are substantially the same as the ground reference potential, electromagnetic shielding can be performed. The signal system ground line 72B and the drive system ground line 74B The radiation of electromagnetic noise to the outside can be reduced.

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

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

In the backbone trunk part 61C shown in FIG. 5, the signal system power line 71B, the signal system ground line 72B, and the drive system power line 73B, which are formed in a plate shape, are stacked, and the outside is covered with an exterior material (housing) Is covered with a drive system ground line 74C. Since the exterior material is made of a conductive metal such as aluminum, it can be used as a grounding conductor. Moreover, since this exterior material can ensure a sufficiently large cross-sectional area easily, it is suitable as a grounding conductor that allows a large current to flow.

As shown in FIG. 5, by covering the outside of the signal system power line 71B and the drive system power line 73 with the exterior material configured as the drive system ground line 74C, the function of an electromagnetic shield can be effectively achieved. That is, since the potential of the drive system ground line 74C is substantially the same as the ground reference potential, 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 section 61C.

<Modification 2>
The cross-sectional structures of the

backbone trunk portions

61D and 61E are shown in FIGS. 6 (a) and 6 (b), respectively.

As shown in FIG. 6 (a), the backbone trunk part 61D is similar to the backbone trunk part 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 the exterior. It differs in that it is covered with a material (housing) 70. The exterior material 70 is made of an insulating material such as resin, and is formed in a tubular shape so as to cover the ground line 74C. Thereby, not only can the same function as the backbone trunk part 61C be achieved, but also the outer peripheral exterior material 70 functions as a cover, so that the durability of the backbone trunk part 61D can be improved.

Further, the backbone trunk part 61E shown in FIG. 6B has an exterior material 70 similar to that of the backbone trunk part 61D, and only the cross-sectional shapes of the drive system power line, the signal system power line, and the signal system ground line are included. Is different. Accordingly, the durability of the backbone trunk part 61E can be improved similarly to the backbone trunk part 61D.

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

In the backbone trunk portion 61F shown in FIG. 7, the signal system power line 71B, the drive system power line 73B, and the drive system ground line 74B formed in a plate shape are stacked, and the outside is covered with the exterior material 70. It is. The exterior material 70 can be made of, for example, a resin as in 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) that constitutes the signal system ground line 72C. The signal ground line 72 may be disposed 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 disposed 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, thereby effectively serving as an electromagnetic shield. Can do. That is, since the potential of the signal system ground line 72C is substantially the same as the ground reference potential, 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 section 61F.

<Modification 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 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 portion 61D shown in the modified example 2, but inside the tubular drive system ground line 74C, the signal system power line 71, the signal system ground line 72, the drive system power line 73, and the drive system ground It differs from the backbone trunk 61D in that it has four lines 74.

That is, the backbone trunk 61G has two drive system ground lines, ie, a drive system ground line 74 having a circular cross section 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 more widely, so that it is not only suitable as a grounding conductor for passing a large current, but the drive system ground line 74C is connected to the signal system power line 71 and the drive system power line. By covering the outside of 73, the function of an electromagnetic shield can be effectively achieved.

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

(Second Embodiment)
FIG. 9 is a connection diagram illustrating an in-vehicle device including a vehicle circuit body according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the component same as 1st Embodiment, and description is abbreviate | omitted.

In the in-vehicle apparatus shown in FIG. 9, the power supply lines 79 of the

backbone trunk lines

61B, 62B, and 63B are commonly used by the drive system

auxiliary machines

81, 83, and 85 and the signal system

auxiliary machines

82, 84, and 86. It is constituted as follows. That is, the signal power supply line 71 and the drive power supply line 73 shown in FIG. Further, the power distribution unit in the

backbone control boxes

64B, 65B, 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 by the signal system and the drive system, the signal system is caused by a voltage drop due to the large current flowing in the drive system

auxiliary machines

81, 83, and 85. There is a possibility that the power supply voltage applied to the

auxiliary machines

82, 84, 86 is lowered. However, since the ground-side line is independent for the signal system and the drive system as in the configuration shown in FIG. 2, the ground potential of the signal system

auxiliary devices

82, 84, 86 is not affected by a large current. Therefore, it is possible to prevent the malfunction of the signal auxiliary machine.

Each of the

backbone trunk lines

61B, 62B, and 63B shown in FIG. 9 includes three lines, that is, a power supply line 79, a signal system ground line 72, and a drive system ground line 74. For example, FIG. 10 (b), FIG. 11 (a), and FIG. 11 (b) can be employed.

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 portion 61B is configured by a covered electric wire having a circular cross-sectional shape. Yes. Each covered electric wire is configured by an inner conductor 75 having a circular cross-sectional shape and an insulating coating 76 covering 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 parallel in a row. A power supply line 79 is arranged in a state sandwiched between the signal system ground line 72 and the drive system ground line 74.

This arrangement can suppress electromagnetic noise from being radiated to the outside. That is, since a large current flows through the power supply line 79, a large electromagnetic noise is radiated from the power supply line 79 along with the switching of the current. However, since the potential of the signal system ground line 72 and the potential of the drive system ground line 74 are substantially the same as the ground reference potential, electromagnetic shielding can be performed. The signal system ground line 72 and the drive system ground line 74 can be shielded. The radiation of electromagnetic noise to the outside can be reduced.

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, these are integrated by bonding, 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 made 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 portion 61B is a plate-shaped covered electric wire having a flat cross-sectional shape. It is configured. Each covered electric wire includes a plate-like inner conductor 77 having a flat cross-sectional shape and an insulating coating 78 covering 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 parallel in a row in a state where they are stacked in the thickness direction thereof. A power supply line 79B is arranged in a state sandwiched between the signal system ground line 72B and the drive system ground line 74B.

This arrangement can suppress electromagnetic noise from being radiated to the outside. That is, since a large current flows through the power supply line 79B, a large electromagnetic noise is radiated from the power supply line 79B when the current is switched. However, since the potential of the signal system ground line 72B and the potential of the drive system ground line 74B are substantially the same as the ground reference potential, electromagnetic shielding can be performed. The signal system ground line 72B and the drive system ground line 74B The radiation of electromagnetic noise to the outside can be reduced.

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, these are integrated by bonding, 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, in practice, the cross-sectional area of the internal conductor 75 in the signal system ground line 72B can be made 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 in a line. Further, a signal system ground line 72 is disposed at the left end of this column, a drive system ground line 74 is disposed at the center, and a power supply line 79 is disposed at the right end.

In the configuration shown in FIG. 11A, it is assumed that the power line 79 is disposed at a position close to the surface of the vehicle body or the surface of the auxiliary machine, for example. Therefore, the signal system ground line 72 and the drive system ground line 74 are arranged at positions outside the surface of the vehicle body or the like. For this reason, the electromagnetic shield function of the signal system ground line 72 and the drive system ground line 74 can reduce the electromagnetic noise radiated from the power supply line 79 from being radiated 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 line in the thickness direction and stacked. In addition, a signal system ground line 72B is disposed at the top of this column, a drive system ground line 74B is disposed at the center, and a power supply line 79B is disposed at the bottom.

In the configuration shown in FIG. 11B, it is assumed that the lowermost power line 79B is disposed at a position close to the surface of the vehicle body or the surface of the auxiliary machine, for example. Therefore, the signal system ground line 72B and the drive system ground line 74B are arranged at positions outside the surface of the vehicle body or the like. Therefore, the electromagnetic shield 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 from being radiated to the outside.

<Modification Example 1 of 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 61J is shown in FIG. 10 in that the signal power supply line 71 and the drive power supply line 73 shown in FIG. Although it is similar to the structure of the backbone trunk part 61B, it differs from the backbone trunk part 61B in that it has a drive system ground line 74C that is not circular in cross section but tubular. The entire outer periphery of the drive system ground line 74 </ b> C is also different from the backbone trunk part 61 </ b> B in that it is covered with an exterior material (housing) 70. The exterior material 70 is made of an insulating material such as resin, and is formed in a tubular shape so as to cover the ground line 74C.

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

Also, the backbone trunk portion 61K shown in FIG. 12B has the same exterior material 70 as the backbone trunk 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 the backbone trunk line 61J can be obtained also in the backbone trunk line 61K.

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

<Advantages of circuit bodies for vehicles>
In any of the above-described configurations, the signal system ground line 72 and the drive system ground line 74 that are independent from each other are provided, and the grounds of the drive system auxiliary machine 81 and the signal system auxiliary machine 82 are separated from each other. It is possible to prevent the ground potential of the machine 82 from floating or fluctuating from the reference potential, and to prevent malfunction of the signal system auxiliary machine 82. Moreover, since the fall of the power supply voltage applied to the signal system auxiliary machine 82 can be suppressed, it can avoid that the performance of the signal system auxiliary machine 82 falls compared with a rating. In addition, as shown in FIG. 2, also for the power supply line, the drive system auxiliary machine 81 and the signal system auxiliary machine 82 are separated from each other, so that the power supply voltage applied to the signal system auxiliary machine 82 can be further suppressed.

Here, the features of the above-described embodiment of the vehicle circuit body according to the present invention will be summarized and listed in the following [1] to [6], respectively.
[1] A vehicle circuit body installed in a vehicle,
A trunk line (backbone trunk line portions 61 to 63) connectable to a plurality of auxiliary machines mounted on the vehicle via branch lines or branch circuits;
The trunk line is
A power line (signal system power line 71, drive system power line 73, power line 79) capable of distributing power from a power source mounted on the vehicle and supplying the power to each of the auxiliary machines;
An earth line capable of being electrically connected between the ground terminal of the power source and the plurality of auxiliary machines;
A plurality of auxiliary devices having a communication function, and a communication line shared as a signal transmission path,
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 including a second earth line (signal system earth line 72) connected to an auxiliary machine through which a smaller current flows.

[2] The power supply line includes a first power supply line (drive system power supply line 73) that supplies power to the auxiliary machine (drive system

auxiliary machines

81, 83, and 85) through which the large current flows, and the large current. The vehicle circuit body according to [1], further including a second power supply line (signal power supply line 71) for supplying power to an auxiliary device (signal

auxiliary devices

82, 84, 86) through which a small current flows.

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

[4] The power supply line is arranged in a space 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 disposed outside the power line and the first ground line at a position farther away from the surface of the vehicle body of the vehicle (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 [1] or [2], wherein the power supply line and the second ground line are arranged in a pipe of the first ground line.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

This application is based on the Japanese patent application filed on July 29, 2016 (Japanese Patent Application No. 2016-150735) and the Japanese patent application filed on July 26, 2017 (Japanese Patent Application No. 2017-144887). Incorporated herein by reference.

ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where a heavy current flows with respect to various auxiliary machines from the power supply on a vehicle, the circuit body for vehicles which can suppress the malfunction of an auxiliary machine and the performance fall of an auxiliary machine The effect that can be provided. The present invention having this effect is useful for a wire harness mounted on a vehicle or a vehicle circuit body having a function equivalent to the wire harness.

DESCRIPTION OF SYMBOLS 10 Power supply 10a Positive side terminal 10b Negative side terminal 11 Engine room 13 Car compartment 16 Dash panel 16a Through-

hole

21, 22, 23 Backbone

main line part

31, 32, 33 Backbone control box 31a Main power supply connection part 31b Main line connection part 31c Branch line Connection part 41

Main power cable

42, 43, 44

Branch sub-harness

51, 52, 53

Electronic control unit

61, 61B, 61C, 61D, 61E, 61F, 61G, 61H, 61J, 61K, 62, 62B, 63B, 63B

Backbone trunk section

64, 64B, 65, 65B, 66, 66B Backbone control box 70

Exterior material

71, 71B Signal

system power line

72, 72B Signal

system ground line

73, 73B Drive

system power line

74, 74B, 74C Drive

system ground line

75,77 inside

Body

76, 78 insulating coating 79

power lines

81, 83, 85 drive system auxiliary 82, 84, 86 signal system accessory

Claims

A circuit body for a vehicle installed in a vehicle,
A trunk line that can be connected to a plurality of auxiliary machines mounted on the vehicle via branch lines or branch circuits,
The trunk line is
A power line capable of distributing power from a power source mounted on the vehicle and supplying each of the plurality of auxiliary machines;
An earth line capable of being electrically connected between the ground terminal of the power source and the plurality of auxiliary machines;
A plurality of auxiliary devices having a communication function, and a communication line shared as a signal transmission path,
The ground line includes a first ground line connected to an auxiliary machine through which a large current flows among the plurality of auxiliary machines, and a second ground line connected to an auxiliary machine through which a current smaller than the large current flows. Including a vehicle circuit body.
The power supply line includes a first power supply line that supplies electric power to an auxiliary machine through which the large current flows, and a second power supply line that supplies electric power to an auxiliary machine through which a current smaller than the large current flows. The vehicle circuit body according to 1.
The first ground line and the second ground line are electrically insulated from each other and arranged side by side in a substantially parallel state on the same routing path. Circuit body for vehicles.
The vehicle circuit body according to claim 3, wherein the power supply line is disposed in a space sandwiched between the first ground line and the second ground line.
4. The vehicle according to claim 3, wherein the second ground line is disposed at an outer position that is farther from the surface of the vehicle on the vehicle body than the power supply line and the first ground line. Circuit body.
The first ground line is formed in a tubular shape;
The circuit body for vehicles according to claim 1 or 2 with which said power supply line and said 2nd earth line are arranged in a pipe of said 1st earth line.