JPH0341374B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention simplifies the wire harness disposed between both cowl sides of an automobile (the wire harness in the portion that crosses the driver's seat) and reduces the trunk diameter.
This invention relates to a wiring system for an automobile that reduces the man-hours required for wiring the wiring harness, reduces the weight of the wiring harness, and thus the automobile, and in particular reduces the installation space for the wiring harness, thereby contributing to the expansion of the driver's seat space. be.

As a prior art related to automobile wiring systems, there is
There is No. 38457, which is explained using a diagram.
In FIG. 1, A indicates an engine compartment of an automobile, B indicates an instrument panel, C indicates a driver's cab, D indicates a cowl side, and 20 indicates a battery.

21, 22, 23, and 24 indicate first, second, third, and fourth connector boxes (hereinafter simply referred to as the first box), and the first box 21 is located on the battery 20 side of the engine compartment A. , the third box 23 is located on the driver's seat side of the instrument panel B, the second box 22 is located on the driver's seat side of the cowl side D, preferably between the tire house and the door, and the fourth box 24 is located on the auxiliary seat side of the cowl side D. be installed respectively.

Each of the boxes 21 to 24 includes a group of arbitrary electrical circuit units each consisting of fuses, relays, various loads of automobiles, switches, circuits for connection with other boxes or connectors, etc., individually or in combination, and a large number of electrical circuit units. A terminal group is provided.

And the first, second and fourth boxes 21 and 22
and 24 wire harnesses 2 and 24 respectively.
6, 27 and 25, the second, third
Between boxes 22 and 23 and between the third and fourth boxes 2
3 and 24 are connected by a wire harness 31, which is connected to the harness 2.
Focus on 7. Also, a wire harness 28 is connected from the second box 22 along the right rear side of the driver's cab B.
A wire harness 29 is arranged along the rear left side of the fourth box 24, and
A wire harness 30 that is partially connected to a tachometer or the like is disposed toward the engine room A.

The unit group is internally connected to the terminal group, and is connected between the first, second, and fourth connector boxes, between the second and third connector boxes, between the third and fourth connector boxes, and between the first, second, and fourth connector boxes. Connections between the first to fourth connector boxes and various loads, switches, etc. of the automobile can be directly connected with a single wire through the terminal group, and the connector boxes located on both sides of the cowl side The wire connecting the fourth connector box and the second connector box does not include a high current power supply line.

In the above-mentioned conventional technology, the drawbacks of the octopus-like wiring that had been implemented before that were solved, the wire harness was simplified, and the labor for manufacturing and wiring was reduced. A wide range of additional equipment has been developed, such as monitoring systems for vehicle performance and electrical options for driver comfort, and the number of wiring harness circuits is increasing.

On the other hand, there are demands from the car body side to reduce the weight of vehicles for low fuel consumption, improve body shapes from an aerodynamic point of view, and expand interior space to improve comfort. A technical challenge is to make the wire harness thinner and simpler.

As the load of the above-mentioned options increases, the number of switches on the instrument panel near the driver's seat increases, and the number of units such as relays and fuses that control the load also increases. As the overall size of the harness increases, the size of the connector box becomes unavoidable, but in particular the instrument panel harness behind the speedometer and the wire harness placed between both cowl sides are subject to juncture. The number of electric wires going from the box to each switch has increased intensively, and their expansion has become unavoidable.
Air conditioning ducts and the like are concentrated, and the space for wiring the wire harness is at its limit, and instead of pursuing the above-mentioned comfort, this has to be sacrificed.

The present invention has been made with attention to the above-mentioned points, and uses a wiring system using a connector box, and is particularly effective at the wire harness portion disposed between both cowl sides where signal lines are concentrated and the wire bundle becomes enlarged. By incorporating a multiplex transmission system while using the connector box, we have succeeded in simplifying the wire harness and reducing the labor involved in manufacturing and wiring, while replacing the wire harness section disposed between both cowl sides with the conventional product. The diameter has been significantly reduced compared to the previous model, making it easier to route the wiring harness in the complicated space behind the meter on the instrument panel, and actively working to expand the interior space to improve livability. It is something.

The present invention will be explained below with reference to the drawings.

In the wiring diagram shown in Figure 2, A is the engine compartment of the car, B is the instrument panel, and C is the
indicates the driver's cabin, D indicates the cowl side, and 20 indicates the battery.

1, 2, 3, 4, 5, and 6 indicate the first, second, third, fourth, fifth, and sixth connector boxes (hereinafter simply referred to as the first box), and the first box 1 is on the driver's seat side of cowl side D, 2nd box 2 is on the driver's seat side in front of engine compartment A, 3rd box 3 is on the driver's seat side of instrument panel B, and 4th box is on the driver's seat at the rear of the car. The fifth box 5 is installed on the battery 20 side of the engine compartment A, and the sixth box 6 is installed on the cowl side D on the auxiliary seat side.

1st, 2nd, 4th, 5th, 6th box 1,
Wire harness W ₁ between 2, 4, 5, and 6,
Connect at W ₂ , W ₄ , W ₅ , W ₆ and connect to 1st box 1
and third box 3 are connected by wire harness _W3 .

The meter box 7 and the first box 1 are connected by a multiplex transmission line W ₇ , and the meter box 7
and the third box 3 by a wire harness _W8 , and the multiple transmission line _W7 and the wire harness _W8 are converged to the wire harness _W3 .

A wire harness _W9 extending to the vicinity of the starter in the engine compartment A is connected to the fifth box 5 via the battery 20, and a wire harness _W10 extending to the rear left side of the driver's cab B is connected to the sixth box 6. , the fourth box 4 is provided with a wire harness _W11 extending leftward at the rear of the vehicle.

Meter box 7 has a central processing unit (CPU)
8 is provided and connected to the CPU 9 in the first box 1 via the multiplex transmission line _W7 .

10 is a connector for the column switch, 11 is a connector for the left cluster switch, and 12 is a connector for the right cluster switch.
The signal is connected to the meter box 7 via W ₁₂ , W ₁₃ , and W ₁₄ and input to the CPU 8 .

Each box 1 to 6 has a large number of electrical circuit units configured singly or in combination with fuses, power transistors, various loads for automobiles, switches, and connection circuits with other boxes or connectors. A terminal group is provided.

However, the installation positions of electrical components installed in automobiles are often limited, and each box 1 to
A preferable electric circuit unit to be installed in 6 is as follows.

A CPU 9 and an input/output device are installed in the first box 1, and its main function is to connect the panel key switch connected to the meter box 7 to the CPU inside the meter.
(Encoder) receives multiplexed signals, the CPU 9 performs software processing on wiper control, defogger control, etc., and sends control signals to a box with an actuator.

A driver is coupled to the CPU 9, which includes room light control for the built-in connector for the room light, wiper motor control for the wiper motor built-in connector, headlight control, fog light control and hall control for the second box, and rear defogger control for the fourth box. Stop light control, license light control and backup control, rheostat control for interior lighting lights, second
and outputs signals such as flasher control for the fourth box.

Also includes brake oil level switch, wiper motor reset signal, backup light switch, oil pressure switch, charge signal,
A latch is provided for input signals from the parking brake switch, fuel empty switch, etc.

The main function of the second box 2 is that of the first box 1.
It receives control signals from and sends signals to actuators that drive loads, and includes headlight actuators, fog light actuators, horn actuators, clearance light actuators, turn light actuators, and wash motor actuators.

The main functions of the third box 3 are to supply and distribute power to electrical components in the room, to connect the instrument panel wiring harness _W15 , to connect the Dash,
This is to absorb joints in the instrument panel wire harness. Power is supplied to the clock, indicator light, radio, cigarette lighter, etc. from the third box.

The main function of the fourth box 4 is to receive the control signal from the first box and control the flashing of the rear combination lights and the defogger, and it also serves as a stop light actuator, a tail light actuator, a backup light actuator,
Includes turn light actuator and defogger actuator.

The main functions of the fifth box 5 are to supply and distribute power to each box, protect the power circuit, starter motor, radiator fan motor,
Its purpose is to control the ignition circuit.

The main function of the sixth box 6 is to supply power via the third box 3 to loads scattered throughout the room.

The left cluster switch connected to connector 11 is comprised of switches for adjusting the speed and light intensity of the wiper motor, blower motor, and rheostat. Note that since the switch is a touch switch using a panel key switch, the on or off state is indicated by a light emitting diode.

The main function of the right cluster switch connected to the connector 12 is to send various signals to the CPU 8 in the meter box.

In the above, CPU8 is meter box 7
Although the meter box 7 is placed inside the meter box 7, it may be placed outside the meter box 7. The reason for choosing the location near meter box 7 as the location for CPU 8 is that the back of the meter box is where the switches are concentrated, and the wires between the CPU and various switches can be short, so it is best to install it inside the meter box. Depending on the CPU
This has the advantage that there is no need to provide a box for the speed display, and in the case of an electronic meter (digital), the CPU that performs calculations for speed display has a combined function, and in the case of a mechanical meter (analog), it can be installed inside the machine frame. Secure the optimal position by installing the CPU.

Fig. 4 compares the convergence diameters of the main parts of a wire harness with a conventional configuration and a wire harness with a wire harness according to the present invention. In relation to the product of the present invention, 28.7φ → 11.1φ, 19.1φ
→8.0φ, 19.1φ → 15.0φ, it can be seen that the width becomes narrower.

In the present invention, all signals (low current) from the cluster switch, combination switch, and ignition switch are input to the CPU near the meter box, and the signals are time-divided by the CPU and sent to the connector box on the cowl side driver's seat side. The transmitted signal is calculated and processed within the connector box to drive and control the load,
On the other hand, near the connector box and meter box.
It transmits the signal for the indicator in the meter to the CPU, and since the data transmission line can be configured with two electric wires, it is possible to achieve a reduction in the trunk diameter of the wiring harness on the cowl side.

In addition, since signal lines pass back and forth around the steering wheel column, the main diameter of the wire harness is the thickest, which tends to reduce assembly work efficiency. This can improve assembly workability.

In addition, by using power transistors instead of relays, the connector box can be made smaller and lighter.Furthermore, the CPU can control switch indicators such as light emitting diodes according to the load status, making it possible to replace conventional switches. A touch switch can be used, and the weight of the switch can be reduced.

As described above, the present invention provides a large number of terminal groups including branch circuits branched by busbar coupling, and also includes a plurality of connector boxes in which desired electric circuits such as fuses, power transistors, and unit groups are collectively provided. It is placed in the engine compartment, cowl side, etc. in a car, and the connector boxes are connected by a wire harness through the terminal group,
A pair of CPUs are provided near the meter box and in a connector box on the cowl side to form a multiplex transmission line, and a wire harness is arranged to connect the multiplex transmission line from the connector box on the cowl side to the opposite cowl side. Since it is arranged along the meter box and inputs the signals of switches concentrated near the meter box to the CPU near the meter box, the labor of manufacturing and wiring is reduced by simplifying the wire harness. While achieving this, the diameter of the wire harness placed between both cowl sides has been made much smaller than that of conventional products, making it easier to route the complicated wire harness behind the meter and improving comfort. The interior space of the vehicle can be expanded.

[Brief explanation of the drawing]

Fig. 1 is a wiring diagram showing a conventional wiring system, Fig. 2 is a wiring diagram showing a wiring system of the present invention, Fig. 3 is a configuration diagram of signals related to time-division data transmission, and Fig. 4 is a wiring diagram showing a conventional wiring system. FIG. 3 is a comparison diagram of trunk diameters of wire harnesses according to the invention. 1, 2, 3...Multiple connector boxes,
W ₁ , W ₂ , W ₃ ...Wire harness, 8, 9...
CPU, W ₇ ...Multiple transmission line.

Claims (1)

[Claims] 1. A large number of terminal groups including branch circuits branched by busbar connections are provided, and a plurality of connector boxes in which desired electric circuits such as fuses and power transistors and unit groups are integrated are installed in the engine room and cowl of the automobile. A pair of connector boxes are placed near the meter box and inside the cowl side connector box, and the connector boxes are connected by a wire harness through the terminal group.
A CPU is provided to form a multiplex transmission line, and the multiplex transmission line is arranged along a wire harness that is installed from the connector box on the cowl side to the opposite cowl side, and the multiplex transmission line is connected to the CPU near the meter box. An automobile wiring system characterized by inputting signals from switches concentrated near a meter box.