JPH05146080A - Vehicle mounted power supply distribution system - Google Patents

Abstract

PURPOSE:To save wiring and to simplify the wiring in automobile by specifying the location for disposing a power supply distributor. CONSTITUTION:The vehicle mounted power supply distributor comprises power supply distributors 20, 30 having multiplex control circuits for taking in signals being transmitted from the multiplex control circuit in other power supply distributor through a network and feeding power from a power supply 10 to a specific load being connected based on thus taken in signals. The power supply distributors 20, 30 are disposed, respectively, in an engine room 1 in the vicinity of the power supply 10 and a cowl section in passenger room 2, for example. In case of a load in the vicinity of the power supply, e.g. the power supply distributor 30, the power supply 10 feeds power to a load 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted power distribution system applied to a vehicle equipped with a multiplex transmission system or the like.

[0002]

2. Description of the Related Art Conventionally, in this type of vehicle-mounted power distribution system, a plurality of power distribution devices having a multiplex control circuit for performing multiplex transmission through a network and a switching element for controlling a load are provided, and the above network is used. When the accessory mode signal or the ignition mode signal and the switch signal of each load are supplied to the power supply distribution device via the power supply distribution device, the power supply distribution device performs on / off control of the switching element based on the obtained signal to determine a predetermined value. It has been proposed to close the circuit of the load and drive the load to distribute the power supply of the vehicle equipped with the multiplex transmission system.

[0003]

However, in the above-mentioned power distribution system, the productivity of wire harness due to the enlargement of the wire harness due to the recent improvement of the equipment such as electrical components and the productivity of the wire harness and the assemblability of the automobile are completely limited. Had a problem that he could not deal with. In particular, the dashboard part is the part where the harness is most concentrated, and the space is limited in this part, and the above-mentioned problem was also large.

The present invention has been made in view of the above-mentioned problems, and it is possible to identify the place where the power distribution device is arranged and to reduce the wiring of the wire harness and simplify the wiring in the vehicle. It is intended to provide a power distribution system.

[0005]

In order to achieve the above object, in the present invention, a plurality of power distribution devices having multiplex control means are provided, and a signal transmitted from the multiplex control means of another power supply distribution device via a network. In the in-vehicle power distribution system that supplies the power from the power supply means to the connected predetermined load based on the received signal by the multiplex control means. Provided is an on-vehicle power distribution system which is installed in an engine room, a cowl portion, etc., and each power distribution device supplies power from the power supply means to a load near the device.

[0006]

A power distribution device is provided in an engine room, a cowl portion, etc. at least in the vicinity of a power supply device in an automobile, and each power distribution device is supplied with power from the power supply device through a power supply line and each power distribution device is provided. The device is loaded to the load near the device,
The supplied power is distributed by a signal obtained via the network.

Therefore, the power distribution system is simplified, and the wire harness in the automobile can be saved.

[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 arrangement state of each power distribution device using the vehicle-mounted power distribution system according to the present invention. In the engine room near the power supply device, the cowl portion near the driver's seat, and the trunk room behind the driver's seat. In this example, power distribution devices are installed at three locations. FIG. 2 is a block diagram showing a specific configuration of the power distribution device shown in FIG. 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 thereof is connected to a power distribution device 20 through a power supply line 11. The power distribution device 20 supplies power to the power distribution devices 30 and 40 through the protection circuit 21 and the power supply lines 12 and 13. Here, the power distribution device 20 is disposed in the engine room 1 near the power supply device 10, and the power distribution device 30 is the meter 17 in the passenger room 2.
Also, the power distribution device 40 is provided in a cowl portion near the switch group 18 around the driver's seat, and the power distribution device 40 is provided in a rear portion such as the trunk room 3 behind the driver's seat.

The power distribution device 20, as shown in FIG.
It includes fuses 22 to 24 connected to the power supply line 11, a multiplex control circuit 25 connected to the fuse 22, and a relay circuit 26 connected to the fuse 23. The protection circuit 21 includes a fuse 21b that connects the power supply lines 11 and 12 and a fuse 21c that connects the power supply lines 11 and 13, and an abnormality such as a ground short-circuit occurs in any of the wires of the power distribution device. When the current occurs and an overcurrent flows, power supply to the corresponding power distribution device is stopped.

The fuse 14 is connected to the load 14 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 14. The negative end of the load 14 is connected to the output section of the multiplex control circuit 25. The relay coil (not shown) and the normally open contact of the relay circuit 26 have fuses 23 at one end.
And the other end of the relay coil is connected to the output part of the multiplex control circuit 25, and the other end of the normally open contact is connected to the positive end of the load 16 and a connection mechanism provided in the main body of the power distribution device 20. Connected through. The negative end of the load 16 is grounded to the vehicle body through a ground wire 27.

The multiplex control circuit 25 controls the multiplex control circuits 3 of the other power distribution devices 30 and 40 via the network 19.
1, 41 are connected to each other, and exchange messages such as control signals from the switch group 18 around the driver's seat for driving and controlling the loads 14 and 16 via the network 19. FIG. 3 is a diagram showing an internal configuration of the multiplex control circuit 25. The switch 15 near the multiplex control circuit 25 has an input interface function (functions such as noise filter, surge protection, voltage level shift) in the circuit. A signal corresponding to ON / OFF of the switch 15 is connected to the input unit 25a included therein and is input to the load control unit 25b having logic, calculation, storage functions, and the like. This switch signal is logically combined with other switch signals by the load control unit 25b, if necessary, and sent to the communication control unit 25c. The communication control unit 25c converts the obtained signal into a serial signal and transmits it to the network 19 via the interface unit 25d. On the other hand, a serial signal sent from another multiplex control circuit via the network 19 is sent from the interface section 25d to the communication control section 25c, where it is decoded and converted into a control signal. Furthermore, the load control unit 25
If necessary, logic is taken in b to generate a load drive signal, and the switching element (transistor) of the output section 25e controls ON / OFF of the load and the relay circuit.

That is, when the multiplex control circuit 25 takes in the control signal, the multiplex control circuit 25 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. This allows
The load 12 is driven by closing the circuit. Also, load 1
Similarly for 6, the relay coil of the relay circuit 26 is excited, the normally open contact is closed, and the power from the power supply device 10 is supplied and driven.

Since the power distribution devices 30 and 40 have substantially the same structure as the power distribution device 20, the description thereof is omitted here. Therefore, in this embodiment, the power distribution device is installed in the engine room near the power supply device, the cowl portion near the driver's seat, and the trunk room behind the driver's seat, and each power distribution device inputs signals generated in the vicinity. ,
It can be transmitted to another power distribution device via a network, the signal line can be simplified, and the load near the device is driven by one power supply line and the signal obtained via the network, so that the power supply can be performed. The wire can be greatly simplified, and the wire harness can be saved. Thereby, the wire harness can be simplified, the manufacturing cost can be reduced, and the productivity can be improved.

Further, in this embodiment, since the power is distributed by the minimum necessary power distribution device, the installation space in the vehicle can be reduced. Further, in the present embodiment, since the wire harness of the entire vehicle can be divided into the main harness between the power distribution devices and the terminal harness between the power distribution devices and the load and the switch by disposing the power distribution device. Since the wire harness can be made into a compact form, productivity can be improved.

Further, in this embodiment, since the main harness and the terminal harness are concentrated in the cowl portion, non-multiplexed signals are gathered and multiplexed signals are gathered through the network, so that the door lock is performed. The vehicle control function for controlling electrical components such as can be efficiently integrated in the power distribution device. Further, in the present embodiment, since the power is supplied to each load in the shortest distance, it is possible to supply a good quality power with a small voltage drop.

Further, in this embodiment, each power distribution device is
Since each device is protected by the protection circuit, it is sufficient to connect the protection circuit and each power distribution device with one power supply line having a thickness matching the protection circuit, which also constitutes the harness. Can be simplified and the harness can be simplified. 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.

To describe the contents of this embodiment in more detail in the context of an actual automobile, the load 14 represents a load such as various warning lamps having a comparatively small drive current, and is constituted by a switching element in the output section of the multiplex control circuit. It is driven directly. On the other hand, the load 16 represents a load such as a rear defogger and a cigarette lighter having a relatively large drive current, and is driven via a relay circuit by a switching element of an output section in the multiplex control 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.

Further, 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. In this embodiment, the engine room near the power supply device, the cowl section near the driver's seat, and the trunk room behind the driver's seat are provided.
Although an example of installation in one place is shown, if it is installed in at least the engine room near the power supply device, the cowl part near the driver's seat, etc., the great effect as shown in the example can be expected. The installation location of the device is not particularly limited.

[0020]

As described above, according to the present invention, a plurality of power distribution devices having multiplex control means are provided, and a signal transmitted from the multiplex control means of another power supply distribution device via a network is transmitted to the multiplex control means. In the vehicle-mounted power distribution system that supplies the power from the power supply means to the connected predetermined load based on the received signal, the power supply distribution device includes at least an engine room near the power supply means and a cowl portion. Etc., each of the power distribution devices supplies power from the power supply means to a load in the vicinity of the device. Therefore, the place where the power distribution device is arranged is specified, and the wire harness of the automobile is saved. And wiring can be simplified.

[Brief description of drawings]

FIG. 1 is a block diagram showing an arrangement state of respective power distribution devices using a vehicle-mounted power distribution system according to the present invention.

FIG. 2 is a block diagram showing a specific configuration 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]

 1 Engine Room 2 Guest Room 3 Trunk Room 10 Power Supply Device 11-13 Power Supply Line 14, 16, 17 Load 15, 18 Switch 19 Network 20, 30, 40 Power Distribution Device 21b, 21c, 22-24 Fuse 25, 31, 41 Multiple control circuit 26 Relay circuit 27 Ground wire

Claims (2)

[Claims] 1. A plurality of power distribution devices having multiplex control means are provided, a signal transmitted from the multiplex control means of another power supply distribution device via a network is fetched by the multiplex control means, and based on the fetched signals. In a vehicle-mounted power distribution system for supplying power from a power supply means to a connected predetermined load, the power distribution device is installed at least in an engine room, a cowl portion, etc. near the power supply means, and each power distribution is performed. An on-vehicle power distribution system, wherein the device supplies power to the load near the device from the power supply means. 2. The power distribution device installed in the engine room is provided with a protection device for branching the power from the power supply device for each power distribution device, and a power supply involved in the occurrence of an accident when an abnormality occurs. The vehicle-mounted power distribution system according to claim 1, wherein power supply to the distribution device is stopped.