JPH05146079A - Power supply distributor - Google Patents

Abstract

PURPOSE:To save wiring of wire harness and to realize simplification by providing a function for grounding a power supply distributor itself directly to the body thereby obviating the necessity for routing the earth wire of the power supply distributor and eliminating earth terminal. CONSTITUTION:The power supply distributor 20 comprises a multiplex control circuit 24 for taking in a signal being transmitted from other multiplex control circuit 35 and the like through a network 15 and feeding power from a power supply 10 to a load 14 connected with the power supply distributor 20. Earth wires of the load 14 and another load 12 located closely to the power supply distributor are taken into the power supply distributor 20 and collectively grounded from a bracket to the body together with components including the multiplex control circuit 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power distribution device used in a multiplex transmission system or the like.

[0002]

2. Description of the Related Art Conventionally, it has been proposed that this type of power distribution device be used for power distribution of a vehicle equipped with a multiplex transmission system. The above device has a multiplex control circuit that performs multiplex transmission via a network, and a switching element that controls a load, and performs on / off control of the switching element based on a signal obtained through the network. The circuit of a predetermined load is closed and the load is driven by only one power supply line.

In the above-mentioned power distribution device, in order to drastically reduce the wiring harness, it is necessary to drive and control many loads in the vicinity of the device, so that the number of switching elements is increased and the ground current is increased. As a result, it has been necessary to route a thick electric wire capable of passing a large current to an earth point outside the power distribution device for grounding. Further, in order to ground the load, an electric wire was routed to a ground point provided on each part of the vehicle body and connected to a ground terminal to be grounded from the vehicle body.

[0004]

However, in the above device, it is necessary to route the thick electric wire to the ground point outside the power distribution device, which causes a problem that the wire harness becomes large. Further, since the ground wire is run for a long time, there is a problem that a large voltage drop occurs and power loss occurs. In addition, because the number of wires that can be crimped to the ground terminal is limited, it is necessary to install multiple ground terminals as the number of equipment increases, and in some cases it is necessary to route the wires to a distant ground point to ground.
Therefore, there is also a problem that the cost of the wire harness is increased.

The present invention has been made in view of the above problems, and it is not necessary to route the ground wire of the power distribution device.
An object of the present invention is to provide a power distribution device that can reduce the number of ground terminals and can reduce the number of wiring harnesses and simplify the wiring harness.

[0006]

In order to achieve the above-mentioned object, the present invention has a multiplexing control means, and a signal transmitted from another multiplexing control means via a network is fetched by the multiplexing control means, In a power distribution device that supplies power from a power supply means to a connected predetermined load based on a captured signal, grounding means for collectively grounding components including the multiplex control means is provided, and the multiplex control is provided. There is provided a power distribution device in which a ground wire of a load controlled by the means and a load in the vicinity of the apparatus is taken into the apparatus main body, and is grounded together with the component parts from the grounding means.

[0007]

In addition to providing a function of directly grounding the power distribution device itself to the vehicle body with a bracket or the like, the ground wire of the load is connected to the nearby power distribution device. Therefore, it is not necessary to route the ground wire, and it is possible to reduce power loss due to voltage drop.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings of FIGS. FIG. 1 is a block diagram showing an embodiment of a power distribution device according to the present invention used in a multiplex transmission system. In the figure, 10 is a power supply device such as a battery or a generator. A negative end of the power supply device 10 is grounded to the vehicle body, and a positive end of the power supply device 10 is connected to each power distribution device 20, 30 via a power supply line 11. It is connected and supplies power to each power distribution device 20, 30.

The power distribution device 20, as shown in FIG.
The fuses 21 to 23 connected to the power supply line 11, the multiplex control circuit 24 connected to the fuse 21, the relay circuit 25 connected to the fuse 22, and the multiplex control circuit 24.
And a bracket 28 to which the ground wire 26 is connected. The fuse 12 is connected to the load 12 via a connection mechanism such as a connector provided in the main body of the power distribution device 20, and supplies the power of the power supply device 10 to the load 12. The negative end of the load 12 is connected to the output section of the multiplex control circuit 24 via a connection mechanism such as a connector provided in the main body of the apparatus 20.

One end of the relay coil (not shown) and the normally open contact of the relay circuit 25 are connected to the fuse 22, and the other end of the relay coil is connected to the multiplex control circuit 24.
And the other end of the normally-open contact is connected to the positive end of the load 14 via a connection mechanism provided in the main body of the power distribution device 20. The negative end of the load 14 is connected to the ground wire 26 of the multiplex control circuit 24 via a connection mechanism provided in the main body of the power distribution device 20.

The multiplex control circuit 24 is connected to the network 15, and the loads 12, 1 are connected via the network 15.
The control signals and messages for driving and controlling 4 are exchanged. FIG. 3 is a diagram showing the internal configuration of the multiplex control circuit 24. The switch 41 near the multiplex control circuit 24 is shown in FIG.
Is connected to an input unit 24a having an input interface function (functions such as noise filter, surge protection, voltage level shift, etc.) in the circuit, and a signal corresponding to ON / OFF of the switch 41 has a logical, arithmetic, storage function or the like. It is input to the load control unit 24b included therein. If necessary, the load control section 24b takes the logic of this switch signal with other switch signals and sends it to the communication control section 24c. The communication control unit 24c converts the obtained signal into a serial signal, and the network 1 via the interface unit 24d.
5 is transmitted. On the other hand, a serial signal sent from another multiplexing control circuit via the network 15 is sent from the interface section 24d to the communication control section 24c, where it is decoded and converted into a control signal. Furthermore, the load controller 24b
If necessary, the logic is taken to generate the load drive signal, and the switching element (transistor) of the output section 24e
Controls ON / OFF of the load and relay circuit.

That is, when the multiplex control circuit 24 takes in the control signal, the multiplex control circuit 24 responds to the signal.
The switching element of the output section is turned on, and the signal line connected to the output section is connected to the ground line 26. As a result, the load 12 is driven with the circuit closed. Also,
Similarly, with respect to the load 14, the relay coil of the relay circuit 25 is excited, the normally open contact is closed, and the power from the power supply device 10 is supplied and driven.

The bracket 28 has a grounding function and is attached to the vehicle body with bolts 29 or the like to fix the power distribution device 20 to the vehicle body and ground it. The configuration of the power distribution device 30 is almost the same as that of the power distribution device 20, and the fuses 31 to 34 connected to the power supply line 11 are connected.
, A multiplex control circuit 35 connected to the fuse 31, and relay circuits 36 and 37 connected to the fuses 32 and 33.
And a bracket (not shown) to which the ground wire 38 of the multiplex control circuit 35 is connected.

The load 16 is connected to the fuse 34 via a connection mechanism such as a connector provided in the main body of the power distribution device 30, and the load 16 is supplied with power from the power supply device 10. The negative terminal of the load 16 is connected to the output section of the multiplex control circuit 35. Each of the relay coils (not shown) and the normally-open contacts of the relay circuits 36 and 37 has one end connected to the fuses 32 and 33, and the other end connected to the output part of the multiplex control circuit 35. The other end of each normally-open contact is connected to the positive ends of the loads 16 and 17 via a connection mechanism provided in the main body of the power distribution device 30. The negative terminals of the loads 17 and 18 are connected to the multiplex control circuit 35.
Is connected to the ground wire 38 of the power distribution device 30 through a connection mechanism provided in the main body of the power distribution device 30.

The multiplex control circuit 35 is connected to the network 15, and the loads 16, 1 are connected via the network 15.
Control signals and messages for driving and controlling 7, 18 are exchanged. Then, when the multiplex control circuit 35 takes in the control signal, the multiplex control circuit 3 responds to the signal.
The switching element of the output section in 5 is turned on, and the signal line connected to the output section is connected to the ground line 38. As a result, the circuit of the load 16 is closed and driven.

Similarly, for the loads 17 and 18,
The relay coils of the relay circuits 36 and 37 are excited, the normally-open contacts are closed, and the power from the power supply device 10 is supplied and driven. A bracket (not shown) has the same structure as the bracket 28 and fixes the power distribution device 30 to the vehicle body and grounds it.

The ground wire 26 of the multiplex control circuit 24 and the ground wire 38 of the multiplex control circuit 35 of this embodiment are connected by a ground wire 40, and one power distribution device is fixed to the vehicle body. Even if you forget or floating
The power distribution device can be surely grounded. Therefore,
In this embodiment, since the power distribution device itself is directly grounded to the vehicle body by a bracket or the like, there is no need to route the ground wire of the multiplex control circuit, and the wire harness can be saved, thereby reducing the voltage drop. It can be reduced and the power loss accompanying this can be prevented.

Further, in this embodiment, since the negative terminal of the load is connected to the nearby power distribution device and grounded, it is possible to reduce the number of ground terminals provided in the vehicle body and ground the load with an extremely short electric wire. As a result, the wire harness can be simplified, the manufacturing cost can be reduced, and the productivity can be improved. Further, since the power distribution device is provided with the connection mechanism, the complicated joint structure of the ground wire is simplified and the productivity of the wire harness can be further improved.

Further, in this embodiment, the bracket for fixing the power distribution device is provided with a grounding function, so that it is possible to avoid forgetting to tighten it in the assembling work and to surely ground the power distribution device from the vehicle body. The load referred to in the present invention means not only a general single load such as a lamp and a motor, but also a subsystem such as a cigarette lighter in which switching means is connected in series with the load, an engine control system, etc. In addition, it refers to all vehicle subsystems including a subsystem that controls a load via a control unit based on various sensor information.

The contents of the present embodiment will be described in more detail with reference to an actual automobile. The loads 12 and 16 represent loads such as various warning lamps having a relatively small driving current, and switching of the output section in the multiplex control circuit. It is directly driven by the element. On the other hand, the loads 14, 17 and 18 represent loads such as a rear defogger and a cigarette lighter having a relatively large drive current, and are driven by a switching element of an output section in the multiplex control circuit via a relay circuit.

The switching elements in the output section of the multiplex control circuit are generally used for low-side switching control (switching control to ground) from the viewpoint of cost reduction and protection from short-circuit to ground. is there.
Further, in this embodiment, the relay circuit and the multiplex control circuit are separate bodies, but the relay circuit may be included in the output section of the multiplex control circuit.

Furthermore, these loads do not necessarily correspond to the switches in a one-to-one manner, and there are some loads whose operation is determined by a combination of two or more. For example, the rear defogger operates when the ignition switch is on and the rear defogger switch is on, and in this case, logic is configured via a network.

[0023]

As described above, according to the present invention, the multiplex control means is provided, and a signal transmitted from another multiplex control means via a network is fetched by the multiplex control means, and based on the fetched signal. In the power distribution device that supplies the power from the power supply means to the connected predetermined load, the power distribution device has grounding means for collectively grounding the components including the multiplex control means, and is controlled by the multiplex control means. Since the ground wire of the load and the load in the vicinity of the device is taken into the device main body and grounded together with the constituent parts from the grounding means, there is no need to route the ground wire of the power distribution device, and the ground terminal is reduced, The wire harness can be reduced in number and simplified.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a power distribution device according to the present invention used in a multiplex transmission system.

FIG. 2 is a diagram showing a specific example of the power distribution device shown in FIG.

FIG. 3 is a diagram showing an internal configuration of the multiplex control circuit shown in FIG.

[Explanation of symbols]

 10 power supply device 11 power supply line 12, 14, 16-18 load 15 network 20,30 power distribution device 21-23, 31-34 fuse 24, 35 multiplex control circuit 25, 36, 37 relay circuit 26, 38, 40 Ground wire 28 Bracket

Claims (2)

[Claims] 1. A multiplexing control means, wherein a signal transmitted from another multiplexing control means via a network is fetched by the multiplexing control means, and a power source from a power supply means is connected based on the fetched signal. In the power distribution device for supplying the predetermined load, the grounding means for collectively grounding the components including the multiplex control means is provided, and the ground wire of the load controlled by the multiplex control means and the load near the apparatus is connected to the ground wire. A power supply distribution device, characterized in that the power supply device is taken into the main body of the device and is grounded together with the constituent parts from the grounding means. 2. The power distribution device according to claim 1, wherein the power distribution device is connected to another power distribution device connected to the network via a ground wire.