JPS61202954A - Wiring device for automobile - Google Patents

Abstract

PURPOSE:To improve the reliability of an electric equipment system at the time of trouble happening, by installing a signal processing part which feeds a central box with a trouble countermeasure signal in place of a detecting signal out of a center when anything unusual in power feed to the sensor occurs in the central box. CONSTITUTION:A central box 20 having connector parts 51-54 to which each of plural wire harnesses 16, 18, 22 and 23 is connected in a separate manner, is set up in the specified position of a car body. This box 20 is provided with a power distributing part 49 and made up of installing a bus bar wiring part 50 inclusive of a bus bar connecting these connector parts 51 and 54 and also a signal processing part 60 inclusive of a pseudo-signal generating circuit 66 inputting each detecting signal out of respective sensors 31 and 33 and generating a pseudo-signal or a trouble countermeasure signal. In addition, the signal processing part 60 outputs a detecting signal of the car speed sensor 31 when trouble in power feed to the car speed sensor 31 is not yet detected, while at the time of trouble detection, it is constituted so as to transmit the pseudo- signal in space of the detecting signal.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a central bonox that forms a wiring concentration section and performs a predetermined function between a plurality of wire harnesses arranged in the body of an automobile. The present invention also relates to a wiring device for an automobile that connects electrical component units installed in various parts of the vehicle body and a central box via a wire harness.

(Prior art) In recent years, automobiles have undergone remarkable development in terms of electrical equipment as their driving performance, safety, and comfort have improved. The types and numbers of intermittent control parts, load devices such as lamps, motors, electronic devices, signal parts such as various sensors, load control units that control load devices, etc. are rapidly increasing.

The increase in the types and number of electrical components has resulted in an extremely large number of electrical wiring attached to the vehicle body, and the wiring routes have become extremely complex, resulting in an increase in the weight of the vehicle and the cost increase of the wiring equipment. Further, there are problems such as the inspection and repair work of electrical wiring becoming complicated.

As one of the countermeasures against such problems related to the electrical wiring of automobiles, for example, as described in Japanese Utility Model Application Publication No. 58-63145, electrical connections between electrical components installed in various parts of the automobile body have been proposed. This is done using a wire harness formed by bundling multiple wires in advance in a shape appropriate for installation on the vehicle body, and a junction harness section is provided near the instrument panel, etc., for relaying the multiple wire harnesses. A control box is installed, and control units for various electrical components are built into this control box, and each control unit is interconnected with the various electrical components through a wiring harness through a junction harness section. Automotive wiring devices are known. In this way, a control box equipped with a junction harness section is used to interconnect multiple wire harnesses to which various electrical components are connected, and to connect each control unit to the wire harnesses. The simplification of electrical wiring will proceed.

However, even if such a control box is used to simplify electrical wiring, a large amount of space will be required within the control box if a large number of control units for various electrical components are incorporated into the control box. Because of the large size of the control box, and the fact that it is difficult to separate the control unit for some electrical components, the control unit is placed in each part of the vehicle as appropriate and connected to each wire harness. Furthermore, since the installation of the control unit will be optional, the control unit will be installed in each part of the vehicle body and connected to the predetermined location of each wire harness. It will be connected.

By the way, as mentioned above, among the electrical component units represented by the control units installed in various parts of the vehicle body, for example, power is supplied from a specific sensor through a predetermined power supply path with a fuse interposed. In many cases, a sensor includes multiple control units that commonly use a detection signal to perform respective control operations. For example, if the power supply to a particular sensor is cut off due to a fuse interposed in the power supply line blowing out and the sensor stops operating, multiple control units, etc. that receive detection signals from the power supply are cut off. This will result in an abnormal situation in which the controller will not be able to perform normal control operations. Therefore, measures have been taken to quickly and reliably deal with the situation where the sensor shared by multiple electrical component units stops working, and to minimize the damage. It is desirable to improve reliability.

(Objective of the Invention) In view of the above, the present invention provides a system in which one end of a plurality of wire harnesses, which are arranged in a vehicle body with different wiring routes and are connected to a sensor and a plurality of electrical component units that share this sensor, is connected to a central box. Make it possible to concentrate,
Power is supplied to the sensor through the central box, and the detection signal from the sensor is distributed and supplied to multiple electrical component units through the central box, and the central box detects an abnormality in the power supply to the sensor. It is an object of the present invention to provide a wiring device for an automobile that can quickly and reliably take measures to minimize the damage caused by a situation in which a sensor stops operating.

(Structure of the Invention) In order to achieve the above-mentioned object, a wiring device for an automobile according to the present invention includes a plurality of wire harnesses arranged in a vehicle body, a sensor connected to the wire harness, and a sensor connected to the wire harness. A central ponox is installed in the vehicle body and has a plurality of electrical components that share the above-mentioned sensor, and a plurality of connectors to which one end of each wire harness is connected. be done. The central box is connected to a busbar wiring section including a sensor power supply busbar that delivers good power supplied to the above-mentioned sensor to the connector section, a busbar wiring section to which a detection signal from the sensor is supplied, an abnormality countermeasure signal generation section, and a sensor power supply busbar. It is equipped with an abnormality detection means for detecting an abnormality in the power supply to the sensor through the power supply bus bar, and when the abnormality detection means does not detect an abnormality, it sends out a detection signal from the sensor, and when an abnormality is detected, it sends out a detection signal from the sensor. Instead, a signal processing section that sends out an abnormality countermeasure signal from an abnormality countermeasure signal generation section, and a signal processing section and a plurality of connector sections in order to supply a detection signal or an abnormality countermeasure signal from a sensor to a plurality of electrical component units. It is formed including a wiring connection part connected via a branch connection part.

With this configuration, if an abnormality occurs in the power supply to the sensor due to a fuse blowing out, etc., it will be detected by the abnormality detection means in the central box, and the multiple electrical component units will immediately receive the detection from the sensor. Instead of the signal, an abnormality countermeasure signal obtained within the central box is supplied, making it possible to minimize damage caused by not being able to obtain a regular detection signal from the sensor.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a wiring device for an automobile according to the present invention, and schematically shows the body of an automobile to which the wiring device is applied, using a dashed-dotted line.

In FIG. 1, an instrument panel 14 is provided at the front of a vehicle compartment 12 in which a driver's seat 10 is located, and a central box 20 is provided near this instrument panel 14. The central box 20 includes an instrument wire harness 16 disposed along the instrument panel 14. Dashboard wire harness installed on the Dashboard board 18. One end of each of a front wire harness 22 disposed at the front of the vehicle and a rear wire harness 23 disposed at the rear of the vehicle are independently connected.

The other end of the instrument wire harness 16 is connected to a floor wire harness 24 disposed on the floor of the vehicle compartment I2.
are connected to each other via a coupler 30, and four door wire harnesses 26 disposed in each door are connected to this floor wire harness 24 via a coupler 32, respectively. In addition, the dash board wire harness 18
An engine room wire harness 28 disposed in the engine room 17 is connected to the front wire harness 22 via couplers 34 and 36.

Each wire harness 16.1B with different wiring routes described above
, 22, 23, and the wire harness 2 connected to these
4, 26, and 28 respectively include front wire harnesses for intermittent control parts such as switches, relays, and fuses, and load devices such as lamps, morphs, and electronic devices, etc., located in various parts of the vehicle body. Only the battery 37 connected to the battery 37 is shown in the figure, and other electrical components and an auto cruise control unit 41 that controls the electric load are omitted. Meter control unit 42, power system h? ill
A control unit as various electrical component units such as a unit 43 and an engine control unit 44, and a vehicle speed sensor 31. A load sensor 33 and other sensors (not shown) are connected, and the connections between these various electrical components and the vehicle speed sensor 31. Load sensor 33 and other sensors and each control unit 41, 42, 43 and 4
4 is connected to each wire harness 16゜1 described above.
8.22, 23, 24.26 and 28 and the central box 20.

In this example, especially this central box 20
, power supply to the vehicle speed sensor 31, load sensor 33, and other sensors, distribution of detection signals from these sensors to each control unit 71 to 44, detection of abnormality in power supply to each sensor, and each sensor. An abnormality countermeasure signal is supplied to each of the control units 41 to 44 when an abnormality in the power supply to the control units 41 to 44 is detected.

FIG. 2 shows an example of a specific configuration of a part of the central box 20 described above. In this specific configuration example, a wiring board section 40 is provided, and this wiring board section 40 includes the instrument wire harnesses 16. Dash board wire harness 18
．． four connector parts 51 to which one ends of the Freon 1-wire harness 22 and the rear wire harness 23 are connected, respectively;
52° 53 and 54, fuses 46a and 46b are interposed, and a power distribution section 49 is provided with branch points 47 and 48, and includes a bus bar that connects the connector section 51 and the connector section 54. busbar wiring section 50, level comparison circuit 61, and AND circuit 62. Inverter 63. A signal processing section 60 including an AND circuit 64, an OR circuit 65, and a pseudo signal generation circuit 66 as an abnormality countermeasure signal generation section, and this signal processing section 60 and each connector section 51, 52, 53, and 54. Junction 67.68
and 69 are formed, and also connects the branch point 48 of the busbar wiring section 50 and the level comparison circuit 61 of the signal processing section 60. A wiring connection section 72 is provided to connect the circuit 62 and the connector section 51.

Then, power from the battery 37 connected to the wire 22b of the front wire harness 22 in which the ignition key switch 39 is interposed is supplied to the power distribution section 49 of the busbar wiring section 50 via the connector section 53, and the power is distributed. The meter control unit 42. is connected to the meter control unit 42. Auto cruise control unit 41. It is supplied to the engine control unit 44, the power seat control unit 43, etc., and the branch point 47
．． Wiring paths 50a and 50b formed by sensor power supply busbars via fuse 46b and branch point 48
The signal is then delivered to the connector section 51 and further supplied to the vehicle speed sensor 31 and load sensor 33 via the wires 16C and 16d of the instrument wire harness 16.

As a result, the vehicle speed sensor 31 and the load sensor 33 are activated, and the vehicle speed detection signal Sv and load detection signal SL obtained from these are transmitted through the wires 16e and 16f of the instrument wire harness 16 and are connected to the wiring via the connector section 51. The vehicle speed detection signal Sv is supplied to the AND circuit 62 of the signal processing section 60, and the load detection signal SL is similarly supplied to another signal processing section (not shown).

In this state, the voltage Vp obtained by dividing the voltage Vp at the branch point 48 in the busbar wiring section 50 at a predetermined ratio is
p' is applied to the comparison input terminal of the level comparison circuit 61 to which the reference voltage Va is applied, and when the voltage Vp' is equal to or higher than the reference voltage Va, that is, the voltage Vp at the branch point 48 is appropriate. At some point, the level comparison circuit 61 outputs a high level output signal S, and the voltage Vp' becomes the reference voltage V.
a, that is, when the voltage Vp at the branch point 48 is abnormal, for example, when the fuse 46a is blown and the voltage Vp at the branch point 48 is zero, the level comparison circuit 61 outputs a low level signal. An output signal S is output.

This output signal S1 is supplied to an AND circuit 62 to which the vehicle speed detection signal Sv is supplied, and its level is inverted by an inverter 63, and the output signal S1 is supplied to an AND circuit 64 as a level inverted signal Sl°. From the AND circuit 62 to which the output signal S1 is supplied, a vehicle speed detection signal Sv is obtained and supplied to the OR circuit 65 only when the output signal S1 takes a high level. On the other hand, the AND circuit 64 to which the level inversion signal SI° is supplied is also supplied with a pseudo signal Ca generated by the pseudo signal generation circuit 66, which is, for example, a signal corresponding to the vehicle speed detection signal Sv representing a predetermined vehicle speed To. The AND circuit 64 obtains a pseudo signal c a - h< and supplies it to the OR circuit 65 only when the inverted signal S1° takes a high level.

Therefore, when the output signal S takes a high level, that is, when the voltage Vp at the branch point 48 is appropriate, the vehicle speed detection signal Sv from the vehicle speed sensor 31 is sent from the OR circuit 65, and the output signal S1 becomes low. When taking the level, when the voltage Vp at the branch point 48 is abnormal, the pseudo signal generation circuit 66 outputs a pseudo-high signal Ca. The vehicle speed sensor 31 is sent out from this OR circuit 65.
Vehicle speed detection signal Sv or pseudo signal generation circuit 66 from
The pseudo signal Ca from the branch connection part 7 of the wiring connection part 72
The wire nodes 16, 18, 22 and 2 are distributed to each connector section 51 to 54 through 0 and connected thereto.
3 through each wire 16a, 18a, 22a and 23a in the meter control unit 42. Auto cruise control uni-nod 41. It is supplied to the engine control unit 44 and power seat control unit 43.

Based on this configuration, when the voltage Vp at the branch point 48 provided in the busbar wiring section 50 is appropriate, power is appropriately supplied to the vehicle speed sensor 31 and the load sensor 33, and the vehicle speed sensor 31 and the load A regular vehicle speed detection signal S9 and load detection signal SL are obtained from the sensor 33. Then, the vehicle speed detection signal Sv from the vehicle speed sensor 31 is sent out from the OR circuit 65 of the signal processing section 60, and the meter control unit 42. Auto cruise control unit, 7 to 41
.

It is supplied to the engine control unit 44 and the power sea 1-control unit 43, and regular control operations are performed in each.

On the other hand, for example, if the fuse 46a blows out and the voltage Vp at the branch point 48 becomes zero, power is not supplied to the vehicle speed sensor 31 and the load sensor 33, and the normal power is not supplied from the vehicle speed sensor 31 and the load sensor 33. The vehicle speed detection signal Sv and load detection signal SL cannot be obtained.

However, in such a case, since the low level output signal S1 is obtained from the level comparison circuit 61 of the signal processing section 60, the pseudo signal Ca generated by the pseudo signal generation circuit 66 from the OR circuit 65 of the signal processing section 60 is This is sent to the meter control unit 42 .instead of the vehicle speed detection signal Sv from the vehicle speed sensor 31 . Auto cruise control unit 4
1. It is supplied to the engine control unit 44 and power seat control unit 43. Therefore, in this case, the meter control unit 42. Auto cruise control unit 41. Each of the engine control unit 44 and the power seat control unit 43 will perform the same control operation as when the vehicle speed detection signal Sv from the vehicle speed sensor 31 representing the predetermined vehicle speed To is supplied. , large-scale confusion will not occur due to the inability to obtain the vehicle speed detection signal Sv from the vehicle speed sensor 31.

In this way, for example, the fuse 46a is blown and power is not supplied to the vehicle speed sensor 31 and the load sensor 33, and the normal vehicle speed detection signal Sv and load detection signal SL are obtained from the vehicle speed sensor 31 and the load sensor 33. In such a case, such abnormality will be detected immediately and countermeasures will be taken quickly and reliably, and as a result, damage can be minimized.

Further, power is supplied to a plurality of sensors including the vehicle speed sensor 31 and the load sensor 33 via a branch point 48 in the busbar wiring section, and a signal processing section 60 connected to this branch point 48 supplies power to the vehicle speed sensor 31 and the load sensor 33. 31 and load sensor 33
Since abnormalities in power supply to a plurality of sensors are detected all at once, abnormalities in power supply to a plurality of sensors can be detected reliably and efficiently.

It should be noted that the pseudo signal Ca not only corresponds to the vehicle speed detection signal Sv representing the predetermined vehicle speed TO, but also
The signal may be a signal equivalent to a vehicle speed detection signal Sv representing a vehicle speed that gradually decreases from a predetermined value, and further,
As an abnormal signal generating section in the signal processing section 60, instead of the pseudo signal generating circuit 66, a signal that causes each control unit to take an appropriate control state or a signal that causes a specific warning to be issued is used as an abnormality countermeasure signal. It may also be provided that something occurs as a result.

Central box 2 with the functions described above
0 is mechanically constructed, for example, as schematically shown in FIGS. 3 and 4.

In the example shown in FIGS. 3 and 4, the upper case 2
and a lower case 3, the upper case 2 is provided with two of the connector portions 5 in which the aforementioned connector portions 51 to 54 are formed, and the lower case 3 is provided with the connector portions 51 to 54. The remaining two connector parts 5 are provided (one of these is not shown in the figure), in which each of the connector parts 5 is formed.

Two boards 4 and 6 forming a wiring board section 40 are housed inside the upper case 2 and lower case 3, and the board 4 includes a power distribution section 49 having the aforementioned branch points 47 and 48. A plurality of busbars 4a including a sensor power supply busbar forming a busbar wiring section 50 in which a sensor power supply busbar is provided are disposed, and various relays 3a, fuses 8b including the above-mentioned fuses 46a and 46b, and, for example, a flasher unit 80, etc. is covered with the upper case 2 or is attached through the upper case 2, and the wiring connection part 72 is formed on the board 6, in which the branch connection part having the above-mentioned branch points 67 to 69 is provided. At the same time, various circuit components 7 including an integrated circuit component 7a forming a signal processing section 60 in which an abnormality countermeasure signal generation section and the like are provided are attached, and furthermore, conductors forming wiring paths for them are attached. . These substrates 4 and 6 are
They are placed facing each other with a spacer 9 interposed therebetween, and are electrically connected to each other by a flexible connection sheet 8d.

(Effects of the Invention) As is clear from the above description, according to the automotive wiring device according to the present invention, a sensor and a plurality of electrical component units that are disposed on the vehicle body and share the sensor are connected to each other using different wiring routes. One end of multiple wire harnesses connected to the sensor is concentrated in the central box, and power is supplied to the sensor via the central box, and detection signals from the sensor are sent to the multiple electrical component units via the central box. Under distributed power supply, when an abnormality occurs in the power supply to the sensor in the central box and the sensor becomes inoperable, this is immediately detected and the abnormality is sent to each electrical component unit instead of the detection signal from the sensor. Since a signal processing unit is provided to supply a countermeasure signal, it is possible to quickly and reliably take countermeasures against the situation where the sensor stops working, thereby minimizing the damage. Can be done. Therefore,
This makes it possible to effectively improve the reliability of an electrical system in a vehicle that includes a plurality of electrical component units that share a specific sensor.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an example of an automobile wiring device according to the present invention, FIG. 2 is a connection diagram showing an example of a specific configuration of a part of the central box used in the example shown in FIG. 3 and 4 are a perspective view and a sectional view, respectively, showing an example of the specific mechanical configuration of the central box box used in the example shown in FIG. 1. In the figure, 16 is an instrument wire harness, 18 is a dash board wire harness, 20 is a central box, 22 is a front wire harness, 23 is a rear wire harness, 31 is a vehicle speed sensor, 40 is a wiring board section, 4
1 is an auto cruise control unit, 42 is a meter control unit, 43 is a power seat system JIrJ unit, 44
is an engine control unit, 49 is a power distribution section, 50 is a bus bar wiring section, 51 to 54 are connector sections, 60 is a signal processing section, 66 is a pseudo signal generation circuit, 70 is a branch connection section, 7
2 is a wiring connection part. Patent applicant Mazda Motor Corporation Figure 1

Claims (1)

[Claims] A plurality of wire harnesses arranged in the car body,
a central box installed at a predetermined part of the vehicle body and having a plurality of connector parts to which each of the wire harnesses is connected independently; a sensor connected to the wire harness to generate a predetermined detection signal; and the sensor. a busbar wiring section including a sensor power supply busbar for delivering power to be supplied to the sensor to the connector section; An abnormality detection means is provided, which is supplied with a detection signal from the sensor and detects an abnormality in the power supply to the sensor through the sensor power supply busbar. a signal processing unit that sends out a detection signal from the sensor when no abnormality is detected by the means, and sends out the abnormality countermeasure signal in place of the detection signal from the sensor when an abnormality is detected; a wiring connection section that connects the signal processing section and the plurality of connector sections via a branch connection section in order to supply the detection signal or abnormality countermeasure signal from the sensor to the plurality of electrical component units. An automobile wiring device characterized in that: