JP2002321571A - Integral system of electric connecting box for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an arrangement mode of an electric connecting box for vehicle. SOLUTION: An engine electronic control unit is stored in a junction box in which a relay box and an engine electronic control unit(engine ECU) mounting a fusible link and a relay arranged in an engine room are not arranged in the engine room but arranged in a room side, a fuse circuit and a relay circuit in the relay box are set as a circuit in the junction box, and the electrical junction box arranged in the engine room is integrated in the junction box arranged in the room side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for integrating electric junction boxes for automobiles, and more particularly, to an electric junction box which is distributed and arranged on an engine room side and a room side.

[0002]

2. Description of the Related Art Conventionally, the layout of an electric junction box in an automobile is, as shown in FIG.
An engine electronic control unit (engine ECU) 2 is arranged near the engine 1, and a relay box 4 having a fusible link and a relay is arranged near the battery 3. In FIG. 4, reference numeral 5 denotes an alternator connected to the battery 3. The relay box 4 is connected to the battery 3 via a wire harness W / H1 and the engine E
It is also connected to CU2 via a wire harness W / H2.

On the other hand, on the indoor side Y, a junction box 6 is disposed on the right side in a direction opposite to the battery 3 disposed on the left side of the engine room, and is connected to the relay box 4 via a long wire harness W / H3. are doing. The wire harness W / H3 passes through a through hole of the dash panel 7 that separates the engine room X from the room Y, and when entering the room Y through the through hole, the front harness W / H3-1 and the instrument It is divided into panel harnesses W / H3-2 and connected by contactors C1 and C2.

[0004]

As described above, since the electric connection boxes are distributed in both the engine room X and the room Y, a circuit (wire harness) for connecting these electric connection boxes is required. Further, there is a problem that the wire harness and its attached parts increase, for example, a contactor connection portion is required to connect the relay box 4 in the engine room X and the junction box 6 in the room Y.

Further, since the circuit is branched by the relay box 4 on which the fusible link and the relay are mounted, the number of wires of the wire harness W / H3 connecting the relay box 4 and the junction box 6 is extremely large. Become. Therefore, the diameter of the wire harness W / H3 is increased,
Since the grommet must be attached to the large-diameter wire harness and passed through the through hole of the dash panel 7, there is a problem that the work of penetrating the dash panel 7 is troublesome. further,
There is a problem that the contactors C1 and C2 also become large due to an increase in the number of electric wires.

Further, when the engine ECU and the relay box are arranged in the engine room X, a waterproof treatment is required, and the structure of the electric connection box and the structure of the wire harness connected to the electric connection box are complicated. . And,
It is necessary to increase the number of operations for fixing the electric connection boxes distributed in the engine room X and the room Y to the vehicle body, and to secure a space for installation.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the number of electric wires and the number of work steps by integrating an engine room and electric junction boxes distributed in the room. I have.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a relay box and an engine electronic control unit (engine EC) equipped with a fusible link and a relay arranged in an engine room.
U) is not arranged in the engine room, and the engine electronic control unit is accommodated in a junction box arranged indoors, and the fuse circuit and the relay circuit in the relay box are provided as circuits in the junction box. The present invention provides an integrated system for an electric junction box for a vehicle, wherein the electric junction box arranged in the vehicle is integrated with a junction box arranged on the indoor side.

As described above, the relay box in which the engine ECU, the fusible link and the relay are mounted, which has been conventionally arranged in the engine room, is moved to the indoor side, and the relay box is moved into the junction box arranged in the indoor side. By absorbing, the electric junction box mounted on the automobile is integrated into one.

[0010] Thus, from the battery side, only the power supply line needs to be connected from the engine room to the junction box disposed in the room, so that the number of electric wires can be reduced as compared with the related art, and the through hole of the dash panel can be passed through. The diameter of the wire harness can be reduced. Furthermore, since there is no electrical junction box in the engine room,
Waterproofing of the wire harness and the electric connection box itself is not required, so that the number of parts can be significantly reduced and the weight can be reduced.

The junction box arranged on the indoor side is arranged on the left side in correspondence with the battery arranged on the left side in the engine room, and the wire harness connecting the battery and the junction box is made the shortest linear shape, In addition, the junction box disposed on the indoor side and the battery disposed in the engine room are directly connected and connected only through a wire harness.

As described above, when the junction box on the indoor side is made to correspond to the side on which the battery is disposed, the electric wires can be shortened. Therefore, unlike the related art, it is not necessary to divide the front harness and the instrument panel harness and connect them with a connector. As a result, a large connector for connecting the front harness and the instrument panel harness can be dispensed with, and the number of parts and the number of connection operations can be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a battery 3 is mounted on the left side of the engine room X in the same manner as in the related art, but an electric connection including the engine ECU and the relay box conventionally arranged near the battery 3 is provided. No boxes are placed. On the other hand, in the room Y separated from the engine room X via the dash panel 6, a battery 3 is provided.
The junction box 10 is mounted on the same left side as the arrangement side. The junction box 10 is arranged at a position close to the dash panel 6 and below the instrument panel.

The junction box 10 is connected to the battery 3 disposed in the engine room X via only one wire harness W / H10. The wire harness W / H10 is only a power supply line from the battery 3 side, and is arranged on the same side as the battery 3 in the vicinity of the through hole of the dash panel 6 to provide the shortest substantially straight wiring. The size of the wire harness W / H10 is not increased. Therefore, the connector connecting portion is not interposed as one continuous wire harness without being divided.

Inside the junction box 10, an engine ECU 11 which is conventionally arranged near the engine in an engine room is housed together with an electronic control unit 12 for indoor electrical components. The electric wire connecting the engine ECU 11 and the engine 1 is the wire harness W / H10
Are wired to the engine room X side as a part of the electric wire constituting the above.

The junction box 10 is provided with an internal circuit of a relay box circuit conventionally disposed near the battery 3 on the engine room side. That is, a fusible link or relay connected to the power supply line connected to the battery 3 is provided inside the junction box 10, and the fusible link or relay is connected to a bus bar arranged inside the junction box 10. That is, the internal circuit of the relay box mounted on the engine room side is absorbed and provided in the internal circuit of the junction box.

With the above configuration, specifically,
As shown in FIGS. 2 and 3, the number of circuits and the number of electric wires can be reduced. 2A and 2B show a power supply circuit, wherein FIG. 2A shows a circuit of the embodiment of the present invention, and FIG. 2B shows a circuit of a conventional example. In this embodiment, the relay box 4 on the engine room side is eliminated,
By connecting the battery 3 to the junction box 10, one circuit provided between the conventional relay box 4 and the junction box 6 can be reduced, thereby reducing two wires. 3A and 3B show a horn circuit shown in FIG. 3, wherein FIG. 3A is a circuit of an embodiment of the present invention, and FIG. 3B is a circuit of a conventional example. In the conventional example shown in (B), the fusible link and the relay of the horn circuit are provided in the relay box 4 on the engine room side, but in the present embodiment shown in (A), they are provided in the junction box 10.
Thereby, one circuit provided between the conventional relay box 4 and the junction box 6 can be reduced, thereby reducing the number of two wires.

[0018]

As is apparent from the above description, according to the present invention, the relay box and the engine ECU conventionally disposed in the engine room are integrally provided inside the junction box disposed on the indoor side to provide the engine. Because the electrical connection box is not arranged on the room side,
Conventionally, the number of circuits for connecting the electrical connection box on the engine room side and the junction box on the indoor side can be reduced, and the number of electric wires can be reduced accordingly.

As described above, in order to reduce the number of electric wires, the number of electric wires of the wire harness connected from the battery side of the engine room to the indoor junction box can be reduced, and the diameter of the wire harness can be reduced. Therefore, the through hole of the dash panel can be reduced, and the workability of inserting the through hole can be improved. In addition, when an electric connection box is disposed on the engine room side, the electric connection box must be waterproof and the wire harness connected to the electric connection box needs to be waterproofed. And the number of parts and man-hours can be greatly reduced.

Further, since the junction box is arranged on the same side as the battery arrangement side, and the distance between the battery and the junction box is minimized, the size of the wire harness can be reduced. As a result, what was conventionally divided into a front harness on the engine room side and an instrument panel harness on the indoor side and connected by a connector is not divided into one wire harness, so that the connector connection can be eliminated. it can. As a result, electrical connection reliability can be improved, the number of connectors can be reduced, and connector connection work can be omitted.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2A is a schematic diagram of a power supply circuit according to an embodiment,
(B) is a schematic diagram showing a conventional power supply circuit.

FIG. 3A is a schematic diagram of a horn circuit according to an embodiment,
(B) is a schematic diagram of a conventional horn circuit.

FIG. 4 is a schematic diagram showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1 engine 3 battery 4 relay box 10 junction box 11 engine ECU X engine room Y room

Claims (2)

[Claims] 1. A relay box having an fusible link and a relay disposed in an engine room and an engine electronic control unit (engine EC)
U) is not disposed in the engine room, but the engine electronic control unit is accommodated in a junction box disposed on the indoor side, and a fuse circuit and a relay circuit in the relay box are provided as circuits in the junction box. An electric junction box for automobiles, wherein the electric junction box arranged in the vehicle is integrated into a junction box arranged indoors. 2. The shortest straight line shape of the wire harness connecting the battery and the junction box, wherein the junction box arranged on the indoor side is arranged on the left side in correspondence with the battery arranged on the left side in the engine room. 2. The integrated system for an electric junction box for an automobile according to claim 1, wherein the junction box disposed on the indoor side and the battery disposed in the engine room are directly connected only via a wire harness.