JP2009184611A - Grounding structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle provided with a grounding structure suitable for a resin body. <P>SOLUTION: This grounding structure is provided with a battery 18 and one or more grounding plates 11 to 17 connected with electric equipment (that is, electric load) mounted on the vehicle via an electric wire. The grounding plates 11 to 17 are connected to a negative terminal of the battery 18, are insulated from the resin body, and are mounted on the vehicle. As the grounding plates 11 to 17, one or more grounding plates 11 to 13 for power for connecting large current load, one or more grounding plates 14 to 16 for a signal for connecting low current load, and a MAIN grounding plate 17 directly connected to the negative terminal of the battery 18 are provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle provided with a ground structure corresponding to a resin body, and more particularly to a ground structure of a resin body using conductive reinforcing fibers.

  Conventionally, in a vehicle having a metal body, as a ground structure for connecting the negative terminal of the battery and the electrical equipment, since the vehicle body itself has conductivity, the negative terminal of the battery is connected to the vehicle body, It was common to connect electrical equipment.

  Recently, however, there are vehicles having a body integrally formed using a synthetic resin such as a reinforced fiber resin. Generally, a synthetic resin is an electrical insulator (that is, a high resistance). The same grounding structure as a vehicle with a made body could not be adopted. Accordingly, various grounding structures are employed in vehicles having a resin body, which are different from those having a metal body.

Patent Document 1 discloses a ground structure in a vehicle including a resin body. FIG. 4 is a diagram showing a ground structure in a vehicle including a conventional resin body disclosed in Patent Document 1. As shown in FIG. In the ground structure shown in FIG. 4, in a vehicle having a resin body, a metal coolant pipe 51 extending in the vehicle front-rear direction is used as a conductive ground member connected to the negative terminal of the battery 52. A plurality of connection seats are formed at appropriate positions of the conductive ground member, and the connection seats and the electrical equipment 53 are connected by electric wiring.
JP-A 63-46946

  However, recently, conductive reinforcing fibers such as carbon fibers have been used as reinforcing fibers for resin bodies. In the ground structure disclosed in Patent Document 1, such conductive reinforcing fibers are used. If the insulation between the conductive grounding member and the resin body is insufficient because the resin body that uses is not a complete insulator, a short circuit may occur due to contact between the resin body and the electrical wiring. was there. That is, when the electrical wiring and the resin body come into contact with each other due to disconnection of the electrical wiring, there is a path for the current from the electrical wiring to return to the negative terminal of the battery 52 via the resin body and the conductive ground member. Existed.

  As another short-circuit path, there is a path in which the current from the electrical wiring returns to the negative terminal of the battery 52 through the casing ground, which is employed as a measure against electrical noise of the electronic components. FIG. 5 is a diagram showing an example of a configuration of a conventional housing ground. As shown in FIG. 5, in the conventional case ground, since the ground is taken to the body 67 in parallel with the W / H ground line, there is conduction from the body 67 to the connector 62. Further, as a short-circuit path, there is a path through which a current from the electrical wiring returns to the negative terminal of the battery 52 through a resin body and a power unit such as an engine or a transmission.

  When the vehicle was a metal body, even if a short circuit occurred due to contact between the metal body and the electrical wiring, a large current flowed and the fuse was blown. On the other hand, if a short circuit occurs due to contact between the resin body and the electrical wiring, the current path may be interrupted by fusing the fuse, but since the resin body has a relatively high resistance, a load is applied from the fuse. It seemed to be connected, and a large current that blown the fuse did not flow, and the fuse did not blow. As a result, there is a possibility that the resin body generates heat as the current continues to flow, and the body strength decreases due to temperature rise.

  Therefore, an object of the present invention is to solve the above-described conventional problems, and to provide a grounding structure suitable for a vehicle including a resin body using conductive reinforcing fibers.

  The present invention is directed to a vehicle including a ground structure corresponding to a resin body using conductive reinforcing fibers. And in order to achieve the said objective, the vehicle of this invention is equipped with at least a battery and 1 or more earth plates to which the electric load mounted in a vehicle is connected via an electrical wiring as an earth structure. The one or more ground plates are connected to the negative terminal of the battery and are insulated from the resin body and attached to the vehicle.

  As a result, even if the resin body and the electrical wiring come into contact with each other, the resin body itself is insulated, so that no current flows and the resin body can be protected.

  Preferably, the vehicle has at least one power system ground plate for connecting a high current load as one or more ground plates, and one or more signal system ground plates for connecting a low current load. With.

  As a result, since a large current from the power system electrical equipment does not flow into the signal system ground plate, the occurrence of ground floating due to the wiring resistance can be suppressed. For this reason, the potential of the signal ground circuit is stabilized, and an earth structure that is strong against floating of the ground can be realized.

  The vehicle may further include a MAIN ground plate that is directly connected to the negative terminal of the battery as one or more ground plates. In this case, the one or more power system ground plates and the one or more signal system ground plates are connected to the negative terminal of the battery via the MAIN ground plate. Further, the MAIN ground plate is disposed in the immediate vicinity of the battery.

  As a result, the wiring resistance from the battery can be minimized by collecting a large current on the MAIN ground plate closest to the battery. Therefore, it is possible to minimize the ground floating that occurs because a large current flows, and it is possible to realize a grounding structure that is strong against ground floating.

  According to the vehicle having the ground structure of the present invention, one or more ground plates connected to the negative terminal of the battery are installed, and the one or more ground plates are connected to the vehicle-mounted device via electric wiring. . The one or more ground plates are attached to the vehicle while being insulated from the resin body. As a result, the resin body and the electrical wiring are in contact with each other, and since the resin body itself is insulated, no current flows and it is possible to prevent the resin body from generating heat.

  FIG. 1 is a top view of a vehicle showing an example of a ground structure according to an embodiment of the present invention. FIG. 2 is a vehicle side view showing an example of a ground structure according to an embodiment of the present invention. 1 and 2, the vehicle includes a resin body 10 using conductive reinforcing fibers. Examples of conductive reinforcing fibers include carbon fibers. The vehicle also includes one or more ground plates 11 to 17 and a battery 18 as a ground structure. Electrical equipment (that is, an electrical load) mounted on the vehicle is connected to the one or more ground plates 11 to 17 via electrical wiring. In this example, the vehicle includes three power system ground plates 11 to 13, three signal system ground plates 14 to 16, and one MAIN ground plate 17 as one or more ground plates.

  The power system ground plates 11 to 13 are ground plates for connecting a large current load (that is, power system electrical equipment), and are connected to power system electrical equipment mounted on the vehicle via electrical wiring. The Examples of the power-type electrical equipment include equipment such as an air conditioner blower motor and a headlamp. The signal system ground plates 14 to 16 are ground plates for connecting a low current load (that is, an electrical device having a signal system ground circuit), and are connected to the vehicle via an electric wiring. Electrical equipment having a circuit is connected. Specifically, the signal system ground plates 14 to 16 are used for taking a reference potential of a computer or the like (that is, an electrical device having a signal system ground circuit). Examples of electrical equipment having a signal ground circuit include EPS (Electric Power Steering) ECU and A / B (Air-Bag) ECU. As described above, the power system ground plates 11 to 13 and the signal system ground plates 14 to 16 are separately arranged as the ground plates, so that the power system electrical equipment is provided on the signal system ground plates 14 to 16 side. Since a large current from the device does not flow, occurrence of ground floating due to wiring resistance can be suppressed. For this reason, the potential of the signal ground circuit is stabilized, and an earth structure that is strong against floating of the ground can be realized.

  The MAIN ground plate 17 is a ground plate for a large current load, and is connected to the power system ground plates 11 to 13 and the signal system ground plates 14 to 16. Further, the MAIN ground plate 17 can be directly connected to a power system electrical device mounted on the vehicle without using the power system ground plates 11 to 13. It is also possible to directly connect the MAIN ground plate 17 with an electrical equipment having a signal ground circuit mounted on the vehicle without using the signal ground plates 14 to 16.

  The MAIN ground plate 17 is directly connected to the negative terminal of the battery 18. The power system ground plates 11 to 13 and the signal system ground plates 14 to 16 are connected to the negative terminal of the battery 18 via the MAIN ground plate 17. The power system ground plates 11 to 13 and the signal system ground plates 14 to 16 may be directly connected to the negative terminal of the battery 18 without the MAIN ground plate 17 interposed therebetween. As a result, each of the ground plates 11 to 17 has the same potential as the negative terminal of the battery 18.

  The MAIN ground plate 17 is preferably disposed in the immediate vicinity of the battery 18. That is, the wiring resistance from the battery 18 can be minimized by collecting a large current on the MAIN earth plate 17 closest to the battery 18. Therefore, it is possible to suppress the ground floating that occurs due to a large current flowing, and an earth structure that is strong against ground floating can be realized.

  In order to prevent a short circuit via the resin body 10, the resin body 10 needs to be electrically insulated from the negative terminal of the battery 18. That is, the resin body 10 has a structure that does not have the same potential as the negative terminal of the battery 18. Therefore, each ground plate 11-17 is insulated from the resin body 10, and is installed in a vehicle. FIG. 3 is a diagram illustrating an example of an installation method of the earth plate. In the example shown in FIG. 1, the power system ground plates 11 to 13 and the signal system ground plates 14 to 16 are installed at different positions. However, as shown in FIG. It is also possible to install a power system ground plate and a signal system ground plate side by side on the platform.

  In addition, since the starter (ST), alternator (ALT), and the like are normally grounded to the engine, the power train / drive train has the same potential as the negative terminal of the battery 18. For this reason, the resin body 10 is insulated from both the power train and the drive train. In addition, the resin body 10 is insulated from a housing ground for protecting electronic components and the like and each electrical equipment. There are various methods for insulating the resin body 10 from each object, and a simple method is to sandwich an insulating material between the resin body 10 and each object. As a result, even when the electrical wiring contacts the resin body 10 due to disconnection of the electrical wiring, the resin body 10 is insulated, so that no short circuit occurs.

  If the metal component mounted on the vehicle can be insulated from the resin body, the metal component can be used as a current path instead of the electric wiring.

  As described above, a vehicle including a ground structure according to an embodiment of the present invention has one or more ground plates 11 to 17 connected to the negative terminal of the battery 18 installed in the vehicle, and the one or more ground plates are installed. The earth plates 11 to 17 and the in-vehicle device are connected via electric wiring. Moreover, the one or more earth plates 11 to 17 are insulated from the resin body 10 and attached to the vehicle. Accordingly, since the resin body 10 and the electric wiring are in contact with each other, the resin body 10 itself is insulated, so that no current flows and the resin body 10 can be protected.

  The ground structure according to the present invention is useful as a ground structure for a vehicle including a resin body.

1 is a top view of a vehicle showing an example of a ground structure according to an embodiment of the present invention. 1 is a vehicle side view showing an example of an earth structure according to an embodiment of the present invention. The figure which shows an example of the installation method of the earth plate which concerns on one Embodiment of this invention. The figure which shows the earth structure in the vehicle provided with the conventional resin body The figure which shows an example of the structure of the conventional housing | casing earth | ground

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Resin body 11-13 Ground plate for power systems 14-16 Ground plate for signal systems 17 MAIN ground plate 18 Battery 51 Metal cooling water piping 52 Battery 53 Electrical equipment 61 Housing 62 Connector 63 Substrate 64 Bracket 65, 66 Nut 67 body

Claims (4)

In vehicles equipped with a grounding structure that supports resin bodies using conductive reinforcing fibers,
The ground structure includes at least a battery and one or more ground plates to which an electrical load mounted on the vehicle is connected via electrical wiring,
2. The ground structure according to claim 1, wherein the at least one ground plate is connected to a negative terminal of the battery and is insulated from the resin body and attached to the vehicle. Vehicle. As the one or more ground plates,
One or more power system earth plates for connecting high current loads;
The vehicle having the ground structure according to claim 1, further comprising one or more signal system ground plates for connecting a low current load. The one or more ground plates further comprise a MAIN ground plate directly connected to the negative terminal of the battery;
The one or more power system ground plates and the one or more signal system ground plates are connected to a negative terminal of the battery via the MAIN ground plate. A vehicle comprising the ground structure according to 2.   The vehicle having a ground structure according to claim 3, wherein the MAIN ground plate is disposed in the immediate vicinity of the battery.

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