VEHICLE CIRCUIT BODY

Abstract

Vehicle switch body provided in a vehicle, comprising: a main line (61, 62, 63) connectable to a plurality of accessories (81, 83, 85) mounted on the vehicle via a branch line or a branch circuit, wherein the main line (61, 62, 63) comprises: a power line (71, 73, 79) capable of distributing electrical energy from a vehicle-mounted power supply (10) and feeding it to the plurality of accessories (81, 83, 85); a ground line (72, 74) capable of being electrically connected between a ground terminal of the power supply (10) and the plurality of accessories (81, 83, 85); and a communication line which is shared as a signal transmission line by the plurality of accessories (81, 83, 85) each having a communication function, and wherein the ground line (72, 74) comprises: a first ground line (74) connected to the plurality of accessories (81, 83, 85) into which a high current flows between the plurality of accessories (81, 83, 85); a second ground line (72) connected to the plurality of accessories (81, 83, 85) into which a current flows which is less than the high current, wherein the power line (71, 73, 79) comprises: a first power line (73) which supplies electrical energy to the plurality of accessories (81, 83, 85) into which the high current flows, and a second power line (71) which supplies electrical energy to the plurality of accessories (81, 83, 85) into which the current flows which is smaller than the high current, and wherein only the first power line (73) of the first power line (73) and the second power line (71) is arranged in a space between the first ground line (74) and the second ground line (72), or both the first power line (73) and the second power line (71) are arranged in the space between the first ground line (74) and the second ground line (72).

Description

TECHNICAL FIELD

[0001] The present invention relates to a wiring harness mounted on a vehicle or a vehicle circuit body having a similar function to the wiring harness. More particularly, it relates to a method for grounding. State of the art

[0002] According to the current state of the art, various types of electrical components, so-called accessories, are mounted at various positions on a vehicle body. Almost all of these accessories require power supplied from a power supply. Communication can occur between some of the accessories, or signals from a switch, sensor, etc. can be transmitted.

[0003] Accordingly, a wiring harness, which serves as an arrangement of a large number of electrical cables, etc., is routed at various locations on a vehicle body in a typical vehicle. The wiring harness is used to connect a power source (a battery or alternator) on the vehicle to each accessory and to connect the accessories to each other.

[0004] In the case of a typical vehicle, the vehicle body is made of electrically conductive metal. Therefore, the vehicle body can be used as a grounding element for grounding, so it is not always necessary to install a ground wire in the wiring harness. On the other hand, in a vehicle where most of the vehicle body is made of resin, the grounding element cannot be used, so it is necessary to provide a grounding element.

[0005] A wiring harness described in PTL 1 comprises a main line with a power line, a communication line, and a ground line. Accordingly, any accessory can be connected to a vehicle-side ground by using the ground line on the main line instead of a ground body.

[0006] Furthermore, PTL 2 discloses a wire harness routing structure in which a long, L-shaped ground member is provided and a wire harness is arranged at a position adjacent to the ground member. Accordingly, even though no ground wire is installed in the wire harness, any accessory can be grounded by using the ground member near the wire harness. CITATION LISTPATENT LITERATURE PTL 1: JP 2015 - 227 089 A PTL 2: JP 2016 - 111 826 A SUMMARY OF THE INVENTION TECHNICAL PROBLEM

[0007] The ground wire also has electrical resistance. Accordingly, a relatively large voltage drop occurs, especially when a high current flows from the power supply to the ground. Furthermore, a large voltage drop also occurs at any location where the current is concentrated. Thus, the potential at the connection point between each accessory and the ground wire fluctuates according to the accessory.

[0008] For example, when using the vehicle's body ground, the cross-sectional area of ​​the path through which the ground current flows is large enough to prevent any accessory from being affected by a voltage drop in the path. However, when using the ground wire or special ground element built into the wiring harness, there is a case where the cross-sectional area of ​​the path through which the ground current flows cannot be sufficiently secured. Accordingly, the likelihood of causing a voltage drop in the ground increases.

[0009] In a Fig. In the configuration example shown in FIG. 13, a signal system load 12 and a drive system load 103 are connected to a power line connected to a positive terminal on a battery 101. Furthermore, a ground terminal of the signal system load 102 and the ground terminal of the drive system load 103 are connected to different positions of a common ground structural body 104. The ground structural body 104 is connected to a negative terminal of the battery 101. Herein, a potential change (potential separated from a reference potential of the ground (GND)) V11 at the position where the signal system load is grounded on the ground structural body 104 and a potential change V12 at the position where the drive system load is grounded on the ground structural body 104 are expressed by the following formulas. V11=(I1p+I1s)×Z11 V12=V11+11p×Z12 where: I1s: Current of the power supply of the signal system load I1p: Power supply current of the drive system load Z11: electrical resistance of the path from the ground point of the signal system load to the battery on the ground structure body Z12: electrical resistance from the ground point of the drive system load to the ground point of the signal system load on the ground structure body

[0010] That is, both currents I1s and I1p flow together through a ground path of the signaling system load 102. It is assumed that the current I1s is small. Thus, even in this case, a large potential change V11 occurs when the current I1p is large. In practice, the current I1s of the signaling system load in the vehicle is often very small, for example, not more than about 1 [A]. However, the total current I1p of the drive system load is often not less than 200 [A]. Accordingly, a large potential change V11 occurs.

[0011] For example, if the ground potential of the signaling system load fluctuates significantly, the threshold for detecting peak / trough potentials of an input signal or a control signal in the signaling system load also fluctuates. This becomes a significant factor leading to malfunctions in the signaling system load. For example, if the drive system load 103 is operating, the probability of a simultaneous malfunction of the signaling system load 102 may increase.

[0012] Furthermore, if the electrical resistances Z11 and Z12 of the ground are large, a power supply voltage between the terminals of the drive system load 103 drops by a voltage drop (V11 + V12). Accordingly, the output of the drive system load 103 decreases, so that the original power cannot be achieved. Depending on the current, the voltage drop occurs not only on the ground side, but also in a similar or identical manner on the power supply side. Accordingly, the power line side is also affected.

[0013] On the other hand, when the drive system load 103 is switched at high speed, the switching current is large. Thus, strong electromagnetic noise is radiated from the line to the surrounding area. The radiated electromagnetic noise enters a control circuit in the signaling system load 102 via a surrounding line or directly, causing a malfunction in an accessory.

[0014] Further prior art is known from document WO 2013 / 002 312 A1. This document describes a vehicle circuit body or wiring harness having a main line connectable to a plurality of accessories. The main line includes a power line capable of distributing electrical energy from a vehicle-mounted power supply and feeding it to the plurality of accessories, and a ground line capable of being electrically connected between a ground terminal of the power supply and the plurality of accessories.

[0015] The present invention was conceived in view of the aforementioned circumstances. It is an object of the present invention to provide a vehicle circuit body that can suppress malfunctions in any of various accessories or performance deterioration of the accessories even when a large current flows from a power supply on a vehicle into the accessories. Solution to the problem

[0016] To achieve the above-mentioned object, the vehicle circuit body according to the present invention is characterized in the following configurations (1) to (4). (1) A vehicle switch body provided in a vehicle, comprising the features of claim 1. (2) A vehicle circuit body according to the aforementioned configuration (1), wherein: the first ground line and the second ground line are arranged next to one another on one and the same conductive path, so that they are arranged substantially parallel to one another and are electrically insulated from one another. (3) A vehicle circuit body according to the aforementioned configuration (1 or 2), wherein the second ground line is arranged at an outer position where the second ground line is farther away from a surface on a vehicle circuit body of the vehicle than the power line and the first ground line. (4) A vehicle circuit body according to the aforementioned configuration (1), wherein the first ground wire is formed into a tube; and the first power line and the second power line and the second ground line are arranged within the tube of the first ground line.

[0017] According to the vehicle circuit body having the aforementioned configuration (1), the first power line and the second power line, which are selectively used in accordance with the largest of the currents fed to the accessories connected to the first and second power lines, are provided independently of each other. This can protect the accessories from malfunctions. That is, the large current flows only in the first ground line, and the current flowing in the second ground line is small. Accordingly, a voltage drop occurring in the second ground line is reduced, so that a ground potential of the accessory with the small current remains substantially unchanged so as not to cause a malfunction in the accessory. Moreover, the current flowing in the second ground line is so small that it is not necessary to increase a cross-sectional area of ​​an electric conductor of the path.Accordingly, it is possible to prevent an increase in the size of the main line even if the main line is formed with both the first ground line and the second ground line.

[0018] According to the vehicle circuit body having the aforementioned configuration (1), the first power line and the second power line, which are selectively used in accordance with the magnitudes of the currents supplied to the accessories connected to the first and second power lines, are provided independently of each other. In this way, it is possible to prevent a decrease in the power supply voltage applied to the terminals of the accessories due to the small current. Moreover, the current flowing in the second power line is so small that it is not necessary to increase the cross-sectional area of ​​the electrical conduction path. Thus, it is possible to prevent an increase in the size of the main line even if the main line includes both the first power line and the second power line.

[0019] According to the vehicle circuit body having the aforementioned configuration (2), the first ground line and the second ground line are arranged so that they are adjacent to each other on the main line. This makes it possible to ground various accessories via the main line, even in an environment where a vehicle ground body or a dedicated ground element cannot be used.

[0020] According to the vehicle circuit body having the aforementioned configuration (1), the first ground line and the second ground line are connected on one side (a ground side) of the power supply. For this reason, the first ground line and the second ground line can be used as electromagnetic shielding. That is, electromagnetic noise radiated from the power line due to its current can be shielded from radiating to the outside of the first ground line and the outside of the second ground line. Thus, it is possible to prevent the noise from adversely affecting any of the accessories located outside the first ground line and the second ground line.

[0021] According to the vehicle circuit body having the aforementioned configuration (3), the second ground line, in which the potential remains substantially unchanged, is arranged at an outermost position. This allows the second ground line to be used as an electromagnetic shield. That is, electromagnetic noise radiated from the power line or the first ground line due to their current can be suppressed from being radiated to the outside of the second ground line. Thus, it is possible to prevent the noise from adversely affecting any of the accessories located outside the second ground line.

[0022] According to the vehicle circuit body having the aforementioned configuration (4), the first ground line, in which a large current flows, is formed in the shape of a tube. Thus, it is possible to suppress a voltage drop in the first ground line while avoiding the enlargement of the main line. Furthermore, the first ground line can be used as an electromagnetic shield. Accordingly, electromagnetic noise radiated from the power line due to its current can be shielded so that it is not radiated to the outside of the first ground line. Accordingly, it is possible to prevent an adverse influence of the noise on any of the accessories located outside the first ground line. ADVANTAGEOUS EFFECTS OF THE INVENTION

[0023] According to the vehicle circuit body according to the present invention, a malfunction occurring in any of the various accessories with a small current can be suppressed, or a decrease in performance of the accessory due to a decrease in a power supply voltage applied to the accessory can be prevented even when a large current flows from a power supply on the vehicle into the various accessories.

[0024] The present invention has been briefly described above. When the modes (hereinafter referred to as "embodiments") for carrying out the invention mentioned below are read with reference to the accompanying drawings, the details of the present invention will become clearer. BRIEF DESCRIPTION OF THE DRAWINGS [ Fig. 1] Fig. 1 is a perspective view showing a configuration example of a main part of an on-vehicle device including a vehicle circuit body according to a first embodiment of the present invention. [ Fig. 2] Fig. 2 is a connection diagram showing the configuration example of the on-vehicle device including the on-vehicle circuit body according to the first embodiment of the present invention. [ Fig. 3] Fig. 3(a) and Fig. 3(b) show longitudinal cross sections illustrating cross-sectional structures of backbone main line sections 61 each having two power lines. [ Fig. 4] Fig. 4(a) and Fig. 4(b) show longitudinal cross sections showing cross-sectional structures of the main lines, in which the positional relationships of the respective elements are different from those in Fig. 3(a) or Fig. 3(b) fluctuate. [ Fig. 5] Fig. 5 is a longitudinal cross-sectional view showing a cross-sectional structure of a main pipe according to a modification 1 of the first embodiment. [ Fig. 6] Fig. 6 is a longitudinal cross-sectional view showing a cross-sectional structure of a main pipe according to a modification 2 of the first embodiment. [ Fig. 7] Fig. 7 is a longitudinal cross-sectional view showing a cross-sectional structure of a main pipe according to a modification 3 of the first embodiment. [ Fig. 8] Fig. 8 is a longitudinal cross-sectional view showing a cross-sectional structure of a main pipe according to a modification 4 of the first embodiment. [ Fig. 9] Fig. 9 is a circuit diagram showing a configuration example of an on-vehicle device including an on-vehicle circuit body according to a second embodiment of the present invention. [ Fig. 10] Fig. 10(a) and Fig. 10(b) show longitudinal cross-sectional views illustrating cross-sectional structures of the backbone main line sections 61B each having a power line. [ Fig. 11] Fig. 11 ((a) and Fig. 11(b) show longitudinal cross-sectional views illustrating cross-sectional structures of the main lines in which the positional relationships of the respective constituent elements are different from those in Fig. 10(a) and Fig. 10(b) may vary. [ Fig. 12] Fig. 12 is a longitudinal cross-sectional view showing cross-sectional structures of the main lines according to a modification 1 of the second embodiment. [ Fig. 13] Fig. 13 shows a circuit diagram of a configuration example of a typical vehicle-side device. DESCRIPTION OF THE EMBODIMENTS

[0025] In the following, certain embodiments of the present invention will be described with reference to the corresponding drawings. (First embodiment)

[0026] In Fig. 1 is a configuration example of a main part of a vehicle-mounted device including a vehicle circuit body according to a first embodiment of the present invention.

[0027] The Fig. The vehicle circuit body shown in Figure 1 is used as a transmission line required for supplying electric power from a main power supply, such as a vehicle-mounted battery, to accessories, i.e., various electrical components located on portions of a vehicle body, or for exchanging signals between the electrical components. That is, the vehicle circuit body has a function similar to that of a typical wiring harness, but differs greatly from the typical wiring harness in terms of structure.

[0028] The Fig. The vehicle-mounted device shown in FIG. 1 illustrates an internal configuration of the vehicle interior near an instrument panel 16, which defines an engine room 11 and the passenger compartment 13 of the vehicle body. A reinforcement (not shown), which is a reinforcing material, is disposed on an instrument panel portion slightly rearward of the instrument panel 16 so as to extend in a left / right direction of the vehicle body. Components of the vehicle circuit body are partially disposed near the reinforcement or the instrument panel 16.

[0029] A plurality of backbone main line sections 21, 22 and 23 and a plurality of backbone control units 31, 32 and 33 are, as in Fig. 1, included in the vehicle circuit body. Each of the backbone main line sections 21, 22, and 23 includes lines such as a power line, a ground line, a communication line, and so on. In addition, for example, band-shaped metal materials (such as copper or aluminum) having a flat shape in cross section are used for the power line and the ground line within the backbone main line section. The power line and the ground line are configured such that they are laminated with metal materials in their thickness direction in an electrically insulated state from each other. Thus, a large current can flow through the power line and the ground line, and the power line and the ground line can be bent relatively easily in the thickness direction.

[0030] The backbone main line portions 21 and 22 are arranged linearly in the left-right direction at a position extending along a surface of the instrument panel 16 such that the backbone main line portions 21 and 22 can extend substantially parallel with the reinforcement at a position above the reinforcement. Moreover, the backbone main line portion 23 is arranged at a substantially lateral center portion of the vehicle body and extends linearly in the up-down direction at a position extending along the surface of the instrument panel 16. Furthermore, the backbone main line portion 23 is bent by approximately 90 degrees in the thickness direction near the boundary between the instrument panel 16 and a floor in the vehicle compartment and is arranged to extend in a front-back direction of the vehicle body along the floor in the vehicle compartment.Incidentally, the backbone main line sections 21 and 22 may be fixed to the reinforcement, or a special member may be provided to which the backbone main line sections 21 and 22 can be fixed.

[0031] The backbone control unit 32 is arranged on the substantially lateral center portion of the vehicle body. The backbone control unit 21 is arranged near a left end in the left / right direction. The backbone control unit 22 is arranged near a right end in the left / right direction.

[0032] A left end of the backbone main line section 21 is coupled to a right end of the backbone control unit 31. A right end of the backbone main line section 21 is coupled to a left end of the backbone control unit 32. Furthermore, a left end of the backbone main line section 22 is coupled to a right end of the backbone control unit 32. A right end of the backbone main line section 22 is coupled to a left end of the backbone control unit 33. Furthermore, a front end of the backbone main line section 23 is coupled to a lower end of the backbone control unit 32.

[0033] That is, as in Fig. As shown in Figure 1, the backbone main line sections 22 to 23 and the backbone control units 31 to 33 are configured to have a T-shaped configuration. Furthermore, internal circuits of the backbone main line sections 21 to 23 can be electrically connected to each other via the backbone control unit 32.

[0034] The backbone control unit 31 arranged on the left side of the vehicle body is formed with a main power connection section 31a, a main line connection section 31b, and a branch line connection section 31c. As shown in Fig. 1, a main power supply cable 41 is connected to the main power connection section 31a of the backbone control unit 31. The left end of the backbone main line section 21 is connected to the main line connection section 31b. A plurality of branch line sub-harnesses 42 are each connected to the branch line connection section 31c. To indicate that the branch line sub-harnesses 42 can be attached to / detached from the backbone control unit 31, Fig. 1 shows a state in which the branch line sub-harnesses 41 have been detached from the backbone control unit 31.

[0035] In addition, although not in Fig. 1, a dual-system power line, a dual-system ground line, and a communication line are included in the backbone main line section 21. Furthermore, a plurality of connection terminals are provided in the main power connection section 31a for connecting a power line and a ground line of the main power supply cable 41.

[0036] Furthermore, the backbone control section 31 includes a circuit board for connecting a power supply system, a ground system, and a communication system of one circuit to those of another circuit or for distributing the electric power between the main power supply cable 41, the backbone main line section 21, and the branch line sub-harnesses 53.

[0037] In the main power cable 41, the ends of the power line and the ground line are connected to the terminals of the main power connection section 31a and secured with bolts and nuts. Thus, the aforementioned circuits can be connected.

[0038] Connectors are provided at the ends of the branch sub-harnesses 42, which can be attached to / detached from the branch connecting portion 31c. Circuits of the branch sub-harnesses 42 can be connected to the branch connecting portion 31c as needed. Each of the branch sub-harnesses 42 is configured to include all or part of the power line, the ground line, and the communication line. Incidentally, the branch connecting portion 31c is provided in the backbone control unit 31, which is Fig. 1, is formed with six connectors, and at most six branch line sub-harnesses 42 can be connected to the branch line connecting portion 31c.

[0039] As in Fig. 1, the backbone main line sections 21 to 23 and the backbone control units 31 to 33 are connected to each other. Further, various branch sub-harnesses 42 to 44 are connected to the backbone control units 31 to 33. Thus, various transmission lines can be laid using a simple structure similar to a backbone. That is, in the vehicle circuit body according to the embodiment of the present invention, the backbone main line sections 21 to 23 and the backbone control units 31 to 33 are configured as the backbone serving as a core section in terms of power distribution or communication transmission, so that the branch sub-harnesses can be appropriately connected to the backbone.

[0040] For example, various electrical components can be mounted on a vehicle as options or additions simply by adding or changing corresponding ones of the branch sub-harnesses 42 to 44 connected to one of the backbone control units 31 to 33. Accordingly, it is not necessary to make changes to the main line structure of the vehicle circuit body. Incidentally, the present embodiment assumes the case where the branch sub-harnesses 42 to 44 are connected to the backbone control units 31 to 33. For example, any other branch sub-harness (not shown) may be connected to a position of a suitable relay point on one of the backbone main line sections 21 to 23.

[0041] For example, as in Fig. 1, vehicle-provided accessories such as an electronic control unit (ECU) 51 can be connected to the backbone control unit or other electrical components via the branch sub-harnesses 42 in the vehicle main device. Furthermore, the electronic control units 51, 52, and 53 or other electrical components can be connected to the backbone control unit 32 via the branch sub-harnesses 43. Furthermore, various electrical components can be connected to the backbone control unit 33 via the branch sub-harnesses 44. The respective electronic control units 51, 52, and 53 can control the various electrical components in the vehicle via the communication lines of the branch sub-harnesses 42, 43, and 44 and the backbone control units 31 to 33, etc.

[0042] A specific example of a circuit configuration is described below.

[0043] In Fig. 2 shows a configuration example of a vehicle-mounted device including the vehicle circuit body according to the first embodiment of the present invention. Fig. The vehicle-mounted device shown in Fig. 2 is formed with the backbone main line sections 61, 62 and 63, the backbone control units 64, 65 and 66, a plurality of drive system accessories 81(1) to 81(N), 83(1) to 83(N) and 85(1) to 85(N) and a plurality of signal system accessories 82(1) to 82(N), 84(1) to 84(N) and 86(1) to 86(N).

[0044] As in Fig. 2, each of the backbone main line sections 61, 62 and 63 is formed with four independent lines, ie, a signal system power line 71, a signal system ground line 72, a drive system power line 73 and a drive system ground line 74.

[0045] The signal system power line 71 and the signal system ground line 72 are a power line and a ground line used to supply power to accessories (referred to as "signal system accessories" in this embodiment), each of which consumes a relatively small power supply current, for example, not more than 10 [A] of rated current. For example, a meter device, an audio device, various electronic control units (ECUs), a small lighting device, etc., mounted on a vehicle correspond to "signal system accessories."

[0046] On the other hand, the drive system power line 71 and the drive system ground line 74 are a power line and a ground line for supplying power to accessories (referred to as “drive system accessories” in the present embodiment), each of which consumes a very high current of the power supply, for example, over 10 [A] rated current. For example, an electric motor for generating the driving forces of various actuators on the vehicle, various heating devices, headlights, etc., belong to the “drive system accessory”.

[0047] Various accessories classified in the "drive system accessories" category are connected to the drive system power line 73 and the drive system ground line 74. Accordingly, the current of the drive system for the entire vehicle is large, reaching approximately 200 to 300 [A] at a peak time. On the other hand, only accessories classified in the "signal system accessories" category, each consuming a smaller current than the drive system, are connected to the signal system power line 71 and the signal system ground line 72. Accordingly, a peak value of the current flowing in the signal lines 71 and 72 is extremely smaller than that flowing in the drive system power line 73 and the drive system ground line 74.

[0048] In the Fig. In the configuration shown in FIG. 2, the signaling system power line 71 and the driving system power line 73 included in the backbone main line section 61 each have one end connected to a positive terminal 10a of the power supply 10 and the other end connected to the backbone control unit 64. The power supply 10 corresponds to a main battery or an alternator mounted on the vehicle. Furthermore, the signaling system ground line 72 and the driving system ground line 74 included in the backbone main line section 61 each have one end connected to a negative terminal 10b of the power supply 10 and the other end connected to the backbone control unit 64.

[0049] Furthermore, the signaling system power line 71, the signaling system ground line 72, the driving system power line 73, and the driving system ground line 74, each connected in the backbone main line section 61, are respectively connected to the corresponding lines included in the backbone main line section 62. Furthermore, the signaling system power line 71, the signaling system ground line 72, the driving system power line 73, and the driving system ground line 74, each included in the backbone main line section 61, are respectively connected to the corresponding lines included in the backbone main line section 63 via an internal circuit of the backbone control unit 64.

[0050] As in Fig. As shown in Figure 2, a signal system power distribution section, a signal system GND (ground, i.e., earth) distribution section, a drive system power distribution section, and a drive system GND distribution section are provided in each of the backbone control units 64, 65, and 66. The signal system power distribution section is connected to the signal system power line 71. The signal system GND distribution section is connected to the signal system ground line 72. The drive system power distribution section is connected to the drive system power line 73. The drive system GND distribution section is connected to the drive system ground line 74.

[0051] As in Fig. 2, a plurality of drive system accessories 81(1) to 81(N) and a plurality of signaling system accessories 82(1) to 82(N) are connected under the backbone control unit 64. The accessories are each connected to the backbone control unit 64 via branch line sub-harnesses.

[0052] In a similar or identical manner, the plurality of drive system accessories 83(1) to 83(N) and the plurality of signaling system accessories 84(1) to 84(N) are connected under the backbone control unit 65. Furthermore, the plurality of drive system accessories 85(1) to 85(N) and the plurality of signaling system accessories 86(1) to 86(N) are connected under the backbone control unit 66.

[0053] For example, in the backbone control unit 64, the drive system power distribution section distributes the power of the drive system power line 73 into a plurality of paths. The electrical powers distributed by the drive system power distribution section are respectively forwarded to the power supply terminals of the drive system accessories 81(1) to 81(N) via branch line sub-harnesses. Also, regarding the ground side, the drive system GND distribution section divides the drive system ground line 74 into a plurality of power paths. The divided power paths are respectively connected to the ground terminals of the drive system accessories 81(1) to 81(N) via the branch line sub-harnesses.

[0054] Furthermore, the signal system power distribution section in the backbone control unit 64 distributes the current of the signal system power line 71 to different paths, respectively. The currents distributed by the signal system power distribution section are respectively supplied to the power supply terminals of the signal system accessories 82(1) to 82(N) via branch line sub-harnesses. Also, regarding the ground side, the signal system GND distribution section divides the signal system ground line 72 into multiple current paths. The divided current paths are respectively connected to the ground terminals of the signal system accessories 82(1) to 82(N) via the branch line sub-harnesses.

[0055] Also within the backbone control unit 65, the drive system power distribution section distributes the power of the drive system power line 73 into multiple paths. The currents distributed by the drive system power distribution section are respectively supplied to the power supply terminals of the drive system accessories 83(1) to 83(N) via branch line sub-harnesses. Furthermore, the drive system GND distribution section divides the drive system ground line 74 into multiple current paths. The divided current paths are respectively connected to the ground terminals of the drive system accessories 83(1) to 83(N) via the branch line sub-harnesses.

[0056] Furthermore, the signal system power distribution section in the backbone control unit 65 distributes the current of the signal system power line 71 into a plurality of paths, respectively. The currents distributed by the signal system power distribution section are respectively supplied to the power supply terminals of the signal system accessories 84(1) to 84(N) via branch line sub-harnesses. Also, regarding the ground side, the signal system GND distribution section divides the signal system ground line 72 into a plurality of current paths. The divided current paths are respectively connected to the ground terminals of the signal system accessories 84(1) to 84(N) via the branch line sub-harnesses.

[0057] Also in the backbone control unit 66, the drive system power distribution section distributes the power of the drive system power line 73 into a plurality of paths. The currents distributed by the drive system power distribution section are respectively supplied to the power supply terminals of the drive system accessories 85(1) to 85(N) via branch line sub-harnesses. Furthermore, the drive system GND distribution section divides the drive system ground line 74 into a plurality of current paths. The divided current paths are respectively connected to the ground terminals of the drive system accessories 85(1) to 85(N) via the branch line sub-harnesses.

[0058] Furthermore, in the backbone control unit 66, the signaling system power supply distribution section distributes the current of the signaling system power line 71 into a plurality of paths, respectively. The currents distributed by the signaling system power supply distribution section are respectively supplied to the power supply terminals of the signaling system accessories 86(1) to 86(N) via branch line sub-harnesses. Also, regarding the ground side, the signaling system GND distribution section divides the signaling system ground line 72 into a plurality of current paths. The divided current paths are respectively connected to the ground terminals of the signaling system accessories 86(1) to 86(N) via the branch line sub-harnesses.

[0059] Accordingly, with respect to each drive system accessory 81(1) to 81(N), 83(1) to 83(N) and 85(1) to 85(N) in the Fig. 2, the power supply current is supplied through the drive system power line 73, and the ground-side current flows through the drive system ground line 74. On the other hand, with respect to each signal system accessory 82(1) to 82(N), 84(1) to 84(N), and 86(1) to 86(N), the power supply current is supplied through the signal system power line 71, and the ground-side current flows through the signal system ground line 72.

[0060] That is, each of the power supply paths to each accessory and each of the ground power supply paths to the accessory are completely independent between the signaling system and the propulsion system. Therefore, even in any current path of the backbone main line sections 61, 62, and 63, a voltage drop generated by the power supply current and the ground current flowing into the propulsion system accessories 81(1) to 81(N), 83(1) to 83(N), or 85(1) to 85(N) does not affect the voltage of the current path of the signaling system accessories 82(1) to 82(N), 84(1) to 84(N), or 86(1) to 86(N). In addition, the current flowing into the signaling system accessories 82(1) to 82(N), 84(1) to 84(N) or 86(1) to 86(N) is smaller than the current flowing into the drive system accessories 81(1) to 81(N), 83(1) to 83(N) or 85(1) to 85(N).

[0061] Accordingly, both the voltage drop in the signal system power line 71 and the voltage drop in the signal system ground line 72 are reduced to an allowable level even when a cross-sectional area of ​​a conductor of each line is comparatively small. Therefore, it is possible to prevent each ground potential of the signal system accessories 82(1) to 82(N), 84(1) to 84(N), and 86(1) to 86(N) from rising or fluctuating with respect to a reference ground potential, that is, a potential of the negative terminal 10b of the power supply 10. Thus, it is possible to prevent the occurrence of malfunctions in each signal system accessory 82.

[0062] Furthermore, the voltage drop in the power line and the ground line is reduced, making it possible to prevent a drop in the power supply voltage applied between the terminals of the signaling system accessory 82. Accordingly, the signaling system accessory 82 can provide a predetermined power corresponding to the rated value. For example, when a vehicle lighting unit, such as a brake lamp or tail lamp, is connected as one of the signaling system accessories 82, a decrease in the amount of light from the brake lamp or tail lamp can be prevented.

[0063] Furthermore, the communication line, although not in Fig. 2, may also be provided in each of the backbone trunk sections 61 to 63. Thus, the trunk line can be used for communication between a variety of accessories.

[0064] The following describes specific configuration examples of the backbone main line sections.

[0065] Fig. 3(a) and Fig. 3(b) show views of cross-sectional structures of the backbone main line sections 61, each of which has two power lines. Incidentally, each power supply communication line constituting each backbone main line section 61 is shown in its cross-sectional shape in Fig. 3(a) and Fig. 3(b) different <Konfigurationsbeispiel 1>

[0066] In the Fig. In the configuration shown in Figure 3(a), each of a signal system power line 71, a signal system ground line 72, a drive system power line 73, and a drive system ground line 74 constituting the backbone main line portion 61 is made of a coated electric wire having a circular cross-section. The coated electric wire is composed of an inner conductor 75 having a circular cross-section and an insulating coating 76 completely covering the periphery of the inner conductor 75. The insulating coating 76 is formed of, for example, a resin. Accordingly, 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 isolated from each other.

[0067] Furthermore, the signal 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 parallel to each other. The drive system power line 73 is arranged between the signal system ground line 72 and the drive system ground line 74.

[0068] With this layout, it is possible to suppress external electromagnetic interference. That is, since a high current flows into the drive system power line 73, strong electromagnetic noise is radiated from the drive system power line 73 according to the switching and current, respectively. However, since a potential of the signal system ground line 72 and a potential of the drive system ground line 74 are substantially equal to the reference potential of the ground, the signal system ground line 72 and the drive system ground line 74 can perform electromagnetic shielding. Accordingly, it is possible to prevent the electromagnetic noise from the signal system ground line 72 and the drive system ground line 74 from being radiated to the outside.

[0069] To connect 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 into a Fig. 3(a), the wires 71 to 74 may be bonded to each other by adhesive bonding, or they may be covered externally with an unillustrated exterior material for connection. Furthermore, the current flowing through each of the signal system power line 71 and the signal system ground line 72 is comparatively small. Accordingly, a sectional area of ​​the inner conductor 75 in each of the signal system power line 71 and the signal system ground line 72 can be made smaller than a cross-sectional area of ​​the inner conductor 75 in each of the drive system power line 73 and the drive system ground line 74. <Konfigurationsbeispiel 2>

[0070] In the Fig. In the configuration shown in Figure 3(b), each of a signal system power line 71B, a signal system ground line 72B, a drive system power line 73B, and a drive system ground line 74B constituting the backbone main line portion 61 is formed of a plate-like coated electric wire (bus bar) having a flat cross-sectional shape. The coated electric wire is composed of a plate-shaped inner conductor 77 formed flat in cross section and an insulating coating 78 completely covering the periphery of the inner conductor 77. The insulating coating 78 is formed of a resin, etc. Accordingly, 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.

[0071] Furthermore, the signaling system power line 71B, the signaling system ground line 72B, the driving system power line 73B, and the driving system ground line 74B are laminated in their thickness direction so that they are arranged in a row and parallel to each other. The driving system power line 73B is arranged between the signaling system ground line 72 and the driving system ground line 74.

[0072] With this layout, it is possible to suppress electromagnetic noise leakage to the outside. That is, since a large current flows into the drive system power line 73B, strong electromagnetic noise is radiated from the drive system power line 73B according to the switching, etc. of the current. However, since a potential of the signal system ground line 72B and a potential of the drive system ground line 74B are each substantially equal to a reference potential of the ground, the signal system ground line 72B and the drive system ground line 74B can perform electromagnetic shielding. Accordingly, it is possible to prevent electromagnetic noise from the signal system ground line 72B and the drive system ground line 74B from being radiated to the outside.

[0073] To connect 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 a Fig. 3(b), the wires 71B to 74B may be bonded by adhesive bonding, or they may be covered externally with an unillustrated exterior material for connection. Furthermore, the current flowing through each of the signal system power line 71B and the signal system ground line 72B is comparatively small. Accordingly, a cross-sectional area of ​​the inner conductor 75 in each of the signal system power line 71B and the signal system ground line 72B can be made smaller than a cross-sectional area of ​​the inner conductor 75 in each of the drive system power line 73B and the drive system ground line 74B. <Konfigurationsbeispiel 3>

[0074] Fig. 4(a) and Fig. 4(b) show views of cross-sectional structures of the backbone main line sections 61, each showing a positional relationship of the respective constituent elements with respect to the components formed in each of the backbone main line sections shown in Fig. 3(a) and Fig. 3(b). Incidentally, the same configuration as that of the backbone main line section 61 is also used for the backbone main line section 62 and the backbone main line section 63.

[0075] In addition, a signal system power line 71, a signal system ground line 72, a drive system power line 73 and a drive system ground line 74, which are similar to those in Fig. 3(a) shown configuration, in a Fig. 4(a). However, the layout of these lines 71 to 74 differs in the configuration shown in Fig. 4(a) from that shown in Fig. 3(a) shown configuration.

[0076] Specifically, the signaling system power line 71, the signaling system ground line 72, the driving system power line 73, and the driving system ground line 74 are arranged in a row and parallel to each other. The signaling system ground line 72 and the driving system ground line 74 are arranged on the outside. The signaling system power line 71 and the driving system power line 73 are arranged such that they are located between the signaling system ground line 72 and the driving system ground line 74.

[0077] With this layout, it is possible to suppress electromagnetic interference to the outside. That is, since a large current flows in the drive system power line 73, strong electromagnetic noise is radiated from the drive system power line 73 according to the switching, etc. of the current. In addition, electromagnetic noise, although relatively small, is also radiated from the signal system power line 71. However, since a potential of the signal system ground line 72 and a potential of the drive system ground line 74 are each substantially equal to a reference potential of the ground, the signal system ground line 72 and the drive system ground line 74 can perform electromagnetic shielding. Thus, it is possible to prevent electromagnetic noise from being radiated from the signal system ground line 72 and the drive system ground line 74 to the outside.

[0078] For fastening 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 a Fig. 4(a), the leads 71 ​​to 74 may be connected by adhesive bonding, or they may be covered from the outside with an unillustrated exterior material for connection. <Konfigurationsbeispiel 4>

[0079] There are also provided a signal system power line 71B, a signal system ground line 72B, a drive system power line 73B and a drive system ground line 74B, which are similar to those in Fig. 3(b) shown configuration, also in the Fig. 4(b) is used. However, the layout of these lines 71B to 74B is different in the configuration shown in Fig. 4(b) from that shown in the configuration shown in Fig. 3(b) shown configuration.

[0080] 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 laminated together in their thickness direction so that they are arranged in a row and parallel to each other. The signal system power line 71B and the drive system power line 73B are arranged between the signal system ground line 72B and the drive system ground line 74B.

[0081] With this layout, electromagnetic noise can be prevented from being radiated to the outside. That is, since a large current flows into the drive system power line 73B, strong electromagnetic noise is radiated from the drive system power line 73 according to the switching, etc. of the current. In addition, electromagnetic noise, although relatively small, is also radiated from the signal system power line 71B. However, since a potential of the signal system ground line 72B and a potential of the drive system ground line 74B are each substantially equal to a reference potential of the ground, the signal system ground line 72B and the drive system ground line 74B can perform electromagnetic shielding. Accordingly, it is possible to prevent electromagnetic noise from being radiated from the signal system ground line 72B and the drive system ground line 74B to the outside.

[0082] To connect 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 into a Fig. 4(b), the leads 71B to 74B may be connected by, for example, gluing, or covered from the outside for connection with an external material not shown. <Modifikation der Querschnittsstruktur der Hauptleitung><Modifikation 1>

[0083] In Fig. 5 shows a cross-sectional structure of a backbone main line section 61C. The Fig. The backbone main line section 61C shown in Figure 5 can have the same function as the backbone main line section 61 with the Fig. 3(b) shown configuration.

[0084] In the Fig. In the backbone main line section 61C shown in FIG. 5, the aforementioned signaling system power line 71B, the aforementioned signaling system ground line 72B, and the aforementioned driving system power line 73B, each formed in a plate shape, are laminated and externally covered with a driving system ground line 73C constituting an outer material (casing). The outer material is formed of, for example, an electrically conductive metal such as aluminum. Accordingly, the outer material can be used as an electrical ground conductor. Moreover, the outer material can easily ensure a sufficiently large cross-sectional area. Accordingly, the outer material is suitable as an electrical ground conductor through which a large current can flow.

[0085] As in Fig. As shown in Figure 5, the signal system power line 71B and the drive system power line 73 are covered with the outer material formed as the drive system ground line 74C. Thus, the outer material can effectively perform an electromagnetic shielding function. That is, a potential of the drive system ground line 74C substantially corresponds to a reference potential of the ground. Accordingly, electromagnetic noise due to current flowing through the drive system power line 73, etc., can be prevented from radiating outward from the backbone main line section 71C. <Modifikation 2>

[0086] In Fig. 6(a) and Fig. 6(b) shows cross-sectional structures of the backbone main line sections 61D and 61E, respectively.

[0087] As in Fig. As shown in Figure 6(a), the backbone main line portion 61D is similar to the backbone main line portion 61C in that a tubular drive system ground line 74C is provided. However, the backbone main line portion 61D differs from the backbone main line portion 61C in that an outer periphery of the drive system ground line 74C is completely covered with the outer material (casing) 70. The outer material 70 is formed of an insulator made of resin, etc., and has a tubular shape to cover the ground line 74C. Thus, the backbone main line portion 61D can perform a similar function or the same function as the backbone main line portion 61C. Moreover, since the outer material 70 serves as a cover on the outer periphery, the durability of the backbone main line portion 61C can be improved.

[0088] In addition, the Fig. 6(b) has an outer material 70 similar to or the same as that of the backbone main line portion 61D, and differs from the backbone main line portion 61D only in the cross-sectional shapes of a drive system supply line, a signal system supply line, and a signal system ground line. Accordingly, the durability of the backbone main line portion 61E can be improved in a similar or the same manner as the backbone main line portion 61D. <Modifikation 3>

[0089] In Fig. 7 shows a cross-sectional structure of a backbone main line section 61F. The backbone main line section 61F shown in Fig. 7, a same function as the backbone main line section 61 can be achieved with the Fig. 3(b) shown configuration.

[0090] The aforementioned signal system power line 71B, the aforementioned drive system power line 73B, and the aforementioned drive system ground line 74B, each having a plate shape, are laminated and externally covered with an outer material 70. The outer material 70 may be formed of, for example, a resin, etc., in a similar or identical manner to that of Modification 2. However, the outer material 70 may be an electrical conductor.

[0091] Furthermore, an outer periphery of the outer material 70 is covered with a thin electrical conductor (a metal such as aluminum), which forms a signal system ground line 72C. Incidentally, the signal system ground line 72 may be arranged along an inner wall of the outer material 70. Since no large current flows into the signal system ground line 72C, it is not necessary to increase the cross-sectional area of ​​the conductive path.

[0092] As in Fig. As shown in FIG. 7, a signal system ground line 72C is arranged around the outer material 70 to cover the signal system power line 71B and the drive system power line 73C from the outside. Thus, the signal system ground line 72C can effectively perform an electromagnetic shielding function. That is, a potential of the signal system ground line 72C substantially corresponds to a reference potential of the ground. Accordingly, electromagnetic noise generated due to a current flowing through the drive system power line 73 can be prevented from being radiated to the outside from the backbone main line section 71F. <Modifikation 4>

[0093] In Fig. 8(a) and Fig. 8(b) shows cross-sectional structures of the backbone main line sections 61G and 61H, respectively.

[0094] As in Fig. As shown in Fig. 8(a), the backbone main line section 61G corresponds to the backbone main line section 61D shown in Modification 2 in that a tubular drive system ground line 74C is provided, and in that an outer periphery of the drive system ground line 74C is completely covered with an outer material (casing) 70. However, the backbone main line section 61G differs from the backbone main line section 61D in that four lines, namely, a signal system power line 71, a signal system ground line 72, a drive system power line 73, and a drive system ground line 74, are provided in the tubular drive system ground line 74C.

[0095] That is, the backbone main line section 61G includes two drive system ground lines, namely, the drive system ground line 74, which has a circular cross-sectional shape, and the drive system ground line 74C, which is formed into a tubular shape. Thus, the total cross-sectional area of ​​the ground lines can be ensured to be wider than an electrical ground line through which a large current can flow. Furthermore, the drive system ground line 74C covers the signal system power line 71 and the drive system power line 73 from the outside, effectively performing an electromagnetic shielding function.

[0096] The Fig. The backbone main line section 61H shown in FIG. 8(b) includes a tubular drive system ground line 74C and a drive system power line, a signal system power line, a signal system ground line, and a drive system ground line surrounded by the drive system ground line 74C, in a similar or identical manner to the backbone main line section 61G. However, only the cross-sectional shapes of the power lines and the ground lines in the backbone main line section 61H differ from those in the backbone main line section 61G. Accordingly, in the backbone main line section 61H, the drive system ground line 74C is also suitable as an electrical ground conductor through which a high current can flow. In addition, the drive system ground line 74C covers the signal system power line 71 and the drive system power line 73 from the outside to also effectively perform an electromagnetic shielding function. (Second embodiment)

[0097] Fig. 9 shows a connection diagram illustrating an on-vehicle device having a vehicle circuit body according to a second embodiment of the present invention. Otherwise, constituent elements corresponding to those of the first embodiment are denoted by the same reference numerals, respectively, and a repeated description is omitted.

[0098] The Fig. The vehicle-mounted device shown in Fig. 9 has a configuration in which a power line 79 of backbone main line sections 61B, 62B, and 63B is shared by the used drive accessories 81, 83, 85 and signal system accessories 82, 84, 86. That is, the signal system power line 71 and the drive system power line 73 shown in Fig. 2 are replaced by the common electrical power line 79. In addition, a power distribution section in each of the backbone control units 64B, 65B, and 66B is shared by the signaling system and the drive system.

[0099] In the Fig. In the configuration shown in Figure 9, the power line 79 is shared by the signal system and the drive system used. Accordingly, there is a possibility that a power supply voltage applied to the signal system accessories 82, 84, and 86 may decrease due to a voltage drop influenced by a high current flowing in the drive system accessories 81, 83, and 85. However, the ground-side lines are connected between the signal system and the drive system in a similar or identical manner to those shown in Fig. 2 are independent of each other. Accordingly, the ground potentials of the signal system accessories 82, 84, and 86 are not affected by the high current, so malfunctions in the signal system accessories can be prevented.

[0100] Each backbone main line section 61B, 62B and 63B located in Fig. 9 are formed of three lines, ie, the power line 79, a signal system ground line 72 and a drive system ground line 74. Accordingly, the backbone main line section 61B, 62B, 63B may, for example, use a configuration shown in Fig. 10(a), Fig. 10(b), Fig. 11(a) or Fig. 11(b).

[0101] In the Fig. In the configuration shown in Figure 10(a), the power line 79, the signal system ground line 72, and the drive system ground line 74 constituting the backbone main line portion 61B are formed by a coated electric wire shaped like a circle in cross section. The coated electric wire consists of an inner conductor 75 having a circular cross-sectional shape and an insulating coating 76 completely covering the periphery of the inner conductor 75. The insulating coating 76 is formed of a resin, etc. Accordingly, the power line 79, the signal system ground line 72, and the drive system ground line 74 are electrically isolated from each other.

[0102] Furthermore, the power line 79, the signaling system ground line 72, and the drive system ground line 74 are arranged in a row and parallel to each other. The power line 79 is arranged between the signaling system ground line 72 and the drive system ground line 74.

[0103] With this layout, electromagnetic noise can be prevented from being radiated to the outside. That is, since a large current flows in the power line 79, strong electromagnetic noise is radiated from the power line 79 according to the switching, etc. of the current. However, since a potential of the signal system ground line 72 and a potential of the drive system ground line 74 each substantially corresponds to a reference potential of the ground, the signal system ground line 72 and the drive system ground line 74 can perform electromagnetic shielding. Thus, it is possible to prevent electromagnetic noise from being radiated from the signal system ground line 72 and the drive system ground line 74 to the outside.

[0104] For fastening the power line 79, the signal system ground line 72 and the drive system ground line 74 in a Fig. 10(a), for example, the wires 79, 72, and 74 may be connected by adhesive bonding, or they may be covered externally for connection with an unillustrated external material. Furthermore, a current flowing through the signal system ground wire 72 is relatively small. Accordingly, a cross-sectional area of ​​an inner conductor 75 in the signal system ground wire 72 can be practically made smaller than that in the drive system ground wire 74.

[0105] In the Fig. In the configuration shown in Figure 10(b), each of a power line 79B, a signal system ground line 72B, and a drive system ground line 74B constituting the backbone main line portion 61B is formed of a plate-like coated electric wire having a flat cross-sectional shape. The coated electric wire is formed of a plate-like inner conductor 77 formed into a flat cross-sectional shape and an insulating coating 78 completely covering the periphery of the inner conductor 77. The insulating coating 78 is made of a resin, etc. Accordingly, the power line 79B, the signal system ground line 72B, and the drive system ground line 74B are electrically isolated from each other.

[0106] Furthermore, the power line 79B, the signal system ground line 72B, and the drive system ground line 74B are laminated in their thickness direction so that they are arranged in a row and parallel to each other. The power line 79B is arranged between the signal system ground line 72B and the drive system ground line 74B.

[0107] Thus, with this arrangement, electromagnetic noise can be prevented from being radiated to the outside. That is, since a large current flows into the power line 79B, strong electromagnetic noise is radiated from the power line 79B according to the switching, etc. of the current. However, since a potential of the signal system ground line 72B and a potential of the drive system ground line 74B each substantially corresponds to a reference potential of the ground, the signal system ground line 72B and the drive system ground line 74B can perform electromagnetic shielding. Thus, it is possible to prevent electromagnetic noise from being radiated from the signal system ground line 72B and the drive system ground line 74B to the outside.

[0108] To connect the power line 79B, the signal system ground line 72B and the drive system ground line 74B in a Fig. 10(b), for example, the wires 79B, 72B, and 74B may be bonded together by adhesive bonding, or they may be covered externally for connection with an unillustrated external material. Furthermore, a current flowing through the signal system ground wire 72B is relatively small. Accordingly, a cross-sectional area of ​​an inner conductor 75 in the signal system ground wire 72B can be practically made smaller than that in the drive system ground wire 74B.

[0109] In the Fig. In the configuration shown in Figure 11(a), the signal system ground line 72, the drive system ground line 74, and the power line 79 are arranged in a row. Furthermore, the signal system ground line 72 is arranged at a left end of the row, the drive system ground line 74 is arranged in the middle of the row, and the power line 79 is arranged at a right end of the row.

[0110] It is assumed that the power line 79 is arranged, for example, at a position near a surface of a body or a surface of an accessory in the Fig. 11(a). Accordingly, the signal system ground line 72 and the drive system ground line 74 are arranged at external positions farther away from the surface of the vehicle body, etc. Therefore, the electromagnetic shielding function of the signal system ground line 72 and the drive system ground line 74 can prevent electromagnetic noise from being radiated to the outside from the power line 79.

[0111] In the Fig. In the configuration shown in Figure 11(b), the signal system ground line 72B, the drive system ground line 74B, and the power line 79B are arranged in a row in the thickness direction thereof and in a laminated state. Furthermore, the signal system ground line 72B is arranged at an uppermost portion of the row, the drive system ground line 74B is arranged in the middle of the row, and the power line 79B is arranged at a lowermost portion of the row.

[0112] It is assumed that the power line 79B is arranged at the lowest portion, for example, at a position near a surface of a vehicle body or a surface of an accessory in the Fig. 11. Accordingly, the signal system ground line 72B and the drive system ground line 74B are arranged at external positions farther away from the surface of the vehicle body, etc. Thus, an electromagnetic shielding function of the signal system ground line 72B and the drive system ground line 74B can prevent electromagnetic noise from being radiated to the outside from the power line 79B. <Modifikation 1 der zweiten Ausführungsform>

[0113] In Fig. 12(a) and Fig. 12(b) shows cross-sectional structures of the backbone main line sections 61J and 61K, respectively.

[0114] As in Fig. 12(a), the backbone main line section 61J corresponds to the configuration of the backbone main line section 61B shown in Fig. 10, in the point that the signal system power line 71 and the drive system power line 72 shown in Fig. 2 are replaced by a shared power line 79. However, the backbone main line portion 61J differs in that a drive system ground line 74C, which is shaped like a tube in cross section rather than a circle, is provided. Furthermore, the backbone main line portion 61J also differs from the backbone main line portion 61B in that an outer periphery of the drive system ground line 74C is entirely covered with an outer material (casing) 70. The outer material 70 is formed of an insulator made of a resin, etc., and formed into a tube shape to cover the ground line 74C.

[0115] Thus, the backbone main line section 61J can perform a similar or identical function to the backbone main line section 61C. Furthermore, since the outer material 70 on the outer periphery serves as a cover, the service life of the backbone main line section 61J can be improved. Furthermore, only two lines (the signal system ground line 72 and the power line 79) are arranged within the tube formed by the ground line 74C. Accordingly, a cross-sectional area of ​​the backbone main line section 61J can be further reduced.

[0116] In addition, the backbone main line section 61K, which is located in Fig. 12(b), the backbone main line portion 61J has an outer material 70 that is similar to or equivalent to the backbone main line portion 61J, but differs from the backbone main line portion 61J only in the cross-sectional shapes of the power line and the signal system ground line. Accordingly, the backbone main line portion 61K can also achieve a similar effect or the same effect as the backbone main line portion 61J. <Weitere Modifikationen>

[0117] In the Fig. In the vehicle-mounted device shown in Figure 2, both the signal system ground line 72 and the drive system ground line 74 are included in each of the backbone main line sections 61 to 63. However, in the case of the vehicle-mounted device mounted on a vehicle whose body is made of metal, a ground body may also be used. When the ground body is used, the signal system ground line 72 or the drive system ground line 74 in the backbone main line sections 61 to 63 may be replaced with the ground body. <Vorteile des Fahrzeugschaltungskörpers>

[0118] In one of the aforementioned configurations, the signal system ground line 72 and the drive system ground line 74 are provided independently of each other, and the ground of each drive system accessory 81 and the ground of each signal system accessory 82 are separated from each other. Thus, the ground potential of the signal system accessory 82 can be prevented from being floating or fluctuating from a reference potential, so that the signal system accessory 82 can be prevented from malfunctioning. Furthermore, the power supply voltage applied to the signal system accessory 82 can be prevented from decreasing, so that the performance of the signal system accessory 82 can be prevented from falling below the rated value. Furthermore, the power line is divided into a power line for the drive system accessory 81 and a power line for the signal system accessory 82, as shown in Fig.2. Thus, the power supply voltage applied to the signal system accessory 82 can be prevented from dropping. INDUSTRIAL APPLICABILITY

[0119] According to the present invention, it is possible to provide a vehicle switch body capable of suppressing malfunctions in various accessories or deterioration in the performance of the accessories even when a high current flows from a power source in a vehicle into the accessories. The present invention achieving this effect is suitable for a wiring harness mounted on a vehicle or a vehicle switch body having a function similar to that of the wiring harness. List of reference symbols 10 Power supply 10a positive connection 10b negative terminal 11 Engine room 13 Vehicle interior 16 Instrument panel 16a Through hole 21, 22, 23 Backbone main line section 31, 32, 33 Backbone control unit 31a Main power connection section 31b Main line connection section 31c Branch line connection section 41 Main power supply 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,63,63,63B Backbone main line section 64, 64B, 65, 65, 65B, 66, 66, 66B Backbone control unit 70 outer 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 inner conductor 76, 78 Insulating coating 79 power line 81, 83, 85 Drive system accessories 82, 84, 86 Signal system accessories

Claims

[1] Vehicle switch body provided in a vehicle, comprising: a main line (61, 62, 63) connectable to a plurality of accessories (81, 83, 85) mounted on the vehicle via a branch line or a branch circuit, wherein the main line (61, 62, 63) comprises: a power line (71, 73, 79) capable of distributing electrical energy from a vehicle-mounted power supply (10) and feeding it to the plurality of accessories (81, 83, 85); a ground line (72, 74) capable of being electrically connected between a ground terminal of the power supply (10) and the plurality of accessories (81, 83, 85); and a communication line which is shared as a signal transmission line by the plurality of accessories (81, 83, 85) each having a communication function, and wherein the ground line (72, 74) comprises: a first ground line (74) connected to the plurality of accessories (81, 83, 85) into which a high current flows between the plurality of accessories (81, 83, 85); a second ground line (72) connected to the plurality of accessories (81, 83, 85) into which a current flows which is less than the high current, wherein the power line (71, 73, 79) comprises: a first power line (73) which supplies electrical energy to the plurality of accessories (81, 83, 85) into which the high current flows, and a second power line (71) which supplies electrical energy to the plurality of accessories (81, 83, 85) into which the current flows which is smaller than the high current, and wherein only the first power line (73) of the first power line (73) and the second power line (71) is arranged in a space between the first ground line (74) and the second ground line (72), or both the first power line (73) and the second power line (71) are arranged in the space between the first ground line (74) and the second ground line (72). [2] The vehicle switch body according to claim 1, wherein the first ground line (74) and the second ground line (72) are arranged side by side on one and the same conductive path so that they are arranged substantially parallel to each other and are electrically insulated from each other. [3] The vehicle circuit body according to claim 1 or 2, wherein the second ground line (72) is arranged at an outer position where the second ground line (72) is farther away from a surface on a vehicle circuit body of the vehicle than the power line (71, 73, 79) and the first ground line (74). [4] Vehicle switch body according to claim 1, wherein the first ground line (74) is shaped into a tube; and the first power line (73), the second power line (71) and the second ground line (72) are arranged within the tube of the first ground line (74).

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