JPS6246384B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiring harness wiring method for a vehicle, and particularly to a vehicle in which a rear differential camera and a radio antenna are integrated with the surface of the rear glass or are arranged close to each other, to prevent the generation of radio noise. The present invention relates to a wiring harness wiring method that prevents the above-mentioned problems.

Since vehicles generally have many sources of radio noise, various measures have been taken, such as incorporating noise prevention devices into each device that is a source of noise.

Particularly in these days when car radios have become essential accessories for vehicles, if the radio's performance is hampered by these noises, it will also affect the commercial value of the vehicle itself. Various studies have been conducted for this purpose.

Therefore, first, the conventional technology will be explained.

Figure 1 shows an outline of the wiring equipment diagram of a general passenger car, and mainly shows the right side of the engine room A, the left side of the engine room B, the engine part C, the dashboard part D, the instrument part E, and the right part F of the dashboard side. , a floor section G, a right side body side H, a left side body side I, and a trunk section J.

Part A has a battery 1, main harness 2, part B has a main harness 3, part C has an EGI harness 4, part E has a switch harness 5, part F has an instrument harness 6, and part H has a body harness. There is a harness 13 and a trunk room harness 19 in the J section.

FIG. 2 is a wiring diagram of the right side F of the dash. In this F section, in addition to the instrument harness 6,
Room lamp harness 7, fuse box 8,
There are a time control unit 9, an automatic door lock timer 10, and a power window timer 11.

The body harness 13 is separated from the air conditioner/audio harness 12 going to the darts section D at the right side F of the darts side, and all the body harnesses 13 after this are bundled and wired to the body panel 20.

FIG. 3 is a wiring diagram of a conventional body harness 13 on the right side H of the body. In this part H,
A hand brake harness 14 and a seat belt harness 15 are separated from the body harness 13. Here, 16 is a handbrake, 17 is a control box, and 18 is a door.

Figures 4 and 5 show an example of conventional wiring harness wiring for a vehicle that has a rear differential and a radio antenna on the rear window.
FIG. 4 shows the wiring state as viewed from the seat side toward the rear window at the rear of the vehicle, and FIG. 5 shows the wiring state as viewed from above the rear parcel tray panel toward the rear of the vehicle.

Hereinafter, in explaining the wiring configuration of this wire harness, the wiring will be divided into two types and explained.

In other words, the thick solid lines indicate the wiring connected to the radio antenna and the rear differential camera-related equipment, and the thick broken lines indicate the radio and rear differential camera-related wiring arranged on the back side of the shield when viewed from the viewpoint. shall be. In addition, two parallel solid lines indicate wiring connected to lights, lamps, speakers, motors, air purifiers, etc., and two parallel dashed lines indicate wiring connected to the back side of the shield as seen from the viewpoint. This figure shows the wiring of these lights, etc.

In FIG. 4, 21 is a radio antenna, and 22 is a rear differential camera. These multi-wire radio antenna 21 and rear differential gear 22
are printed with conductors on the vehicle interior side of the rear glass 23 on the rear surface of the vehicle, and are connected to defogger power supply terminals 24R and 24L provided on both sides of the rear glass 23, respectively.

The reason why the radio antenna 21 is electrically integrated with the rear defogger 22 in this way is to improve the sensitivity of the radio antenna 21 in the AM band by also using the rear defogger 22 as an antenna.

Note that in FIG. 4, AT is an antenna output terminal, which is connected to an in-vehicle radio via a shielded wire (not shown).

Here, the wire harness 25R connected to the defogger power supply terminal 24R is guided to the right (left side of the vehicle) along the upper surface of the rear parcel tray panel (hereinafter simply referred to as "tray panel") 26, and is connected to the defogger power supply terminal 24L. An inductor filter 2 for reducing high frequency noise is provided at the bottom of the tray panel 26 along with the connected wire harness 25L.
Guided by 7. From here, two wire harnesses 25R and 25L are combined to form a wire harness 25, which is wired along the lower rear portion of the tray panel 26 toward the right side of the vehicle together with other wire harnesses.

28 is a defogger sensor attached below the rear defogger 22. The rear defogger 22 is turned on and off based on the sensor signal detected by the defogger sensor 28. Defogatsuga sensor 2
After passing through the tray panel 26, the wire harnesses 29R and 29L connected to both terminals of the tray panel 8 form a wire harness 30 together with the wire harness 25 described above on the lower surface side thereof.

In the following explanation, these defogger-related wire harnesses 25R, 25L, 25, 29R,
29L and 30 are collectively referred to as a defogger wire harness.

Further, in FIGS. 4 and 5, 31R and 31L are both rear speakers, 32 is a trunk room lamp, and 33 is an air cleaner. 34R
and 34L are combination lamps installed on the left and right sides of the rear end of the vehicle, respectively.

Wire harnesses 35R and 35L connected to rear speakers 31R and 31L, and wire harnesses 36 and 3 connected to trunk room lamp 32 and air cleaner 33, respectively.
7 are bundled at the rear of the lower surface of the tray panel 26,
The wire harness 38 is sequentially bundled together with the wire harness 30 described above.

Here, in FIGS. 4 and 5, the hatched portion of the line representing the parallel wire harnesses shows the state of the combined wire harness wiring.

Next, combination lamps 34R and 3
Wire harness 39R and 3 connected to 4L
The two 9L wires are guided as one toward the rear right side wall of the vehicle toward the tray panel 26, and then are combined with the wire harness 38 on the lower surface of the tray panel 26 to form the rear main harness 40, which is connected to the rear seat back body panel. The upper surface of 41 is directed toward the front of the vehicle.

In addition, in the wire harness forming the rear main harness 40, the defogger sensor 28
Wire harnesses 29R and 29L connected to
A defogger sensor amplifier 42 is interposed in the middle of the wiring of the rear main harness 40.

In addition, in the following explanation, the wire harnesses 35R, 35L, 36, 37, 3 connected to electrical components are
When 9R and 39L are collectively referred to as an electrical wiring harness.

However, in such a conventional wiring state of the wire harness in the rear section, the wire harnesses 25, 29L and 29L connected to the rear differential gear 22 and the differential gear sensor 28 are
The wire harness 30 that bundles the speaker 31R
and 31L, trunk room lamp 32, and wire harnesses and wire harnesses 39R and 3 connected to various electrical components such as air purifier 33.
9L, etc., and 1 over a long section as shown by diagonal lines.
It is bundled into a book to form a rear main harness 40.

For this reason, contact opening/closing noise, sliding element noise, etc. that occur when electrical components are turned on and off are superimposed on the electrical wiring harness, and the superimposed noise is combined with these wire harnesses. Rear defogger 22 and defogger sensor 28
is guided to the wire harness of the radio antenna 21 and further mixed into the radio antenna 21. This caused a lot of noise on the radio.

In addition, in order to prevent the generation of such noise, it is necessary to take measures such as installing a noise preventer for each electrical component that is a noise source.

The object of the present invention is to eliminate the above-mentioned drawbacks of conventional wire harness wiring methods.

Therefore, the present invention separates the defogger wire harness and the electrical equipment wire harness from each other at least in the body harness portion at the rear of the vehicle from the dashboard side, so that the problem that occurs during the on/off operation of electrical components such as a combination lamp, In order to prevent contact opening/closing noise, slider noise, etc. from being radiated from the electrical equipment wire harness, the electrical equipment wiring harness is buried in a groove provided in the body panel and wired. To prevent noise from being induced from the body harness and electrical wiring harness to the differential gear wiring harness,
To provide a wiring harness wiring method that prevents noise from entering a car radio.

In addition to the above, the second invention further provides a defogger sensor that controls on/off of the rear defogger by inserting an inductor filter into the power supply harness to the rear defogger, and using a signal obtained by amplifying the detection signal of the defogger sensor. A wire harness wiring method in which a noise prevention filter element is interposed between the defogger wire harness at least near the input terminal on the input side of the amplifier and the body panel to further enhance the noise reduction effect. I will provide a.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIGS. 6 and 7 are diagrams showing an embodiment of the present invention, in which a groove 50 is provided in the side portion of the bottom of the body panel 20 at the rear of the vehicle from the dashboard side, and the electrical wiring harness 13a is embedded in the groove 50. Further, the defogger wire harness 13b is wired at least 5 cm or more away from the electrical equipment wire harness 13a. In other words, the conventional body harness 1
3 is divided into an electrical equipment wire harness 13a and a defogger wire harness 13b, and the wires are wired separately from each other.

In FIG. 7, 51 is a bushing, 52 is an electrical wiring harness 13a connected to a groove 5 in a body panel 20.
53 is this presser cover 5 for pressing the inside.
This is the bolt that holds down 2. The presser cover 52 is provided at three locations in FIG. 6, but at least one location is provided at the rear of the vehicle of the body harness. The appropriate size of the groove 50 is approximately 1.5 to 2 cm deep and 3 to 5 cm wide.

By using the wiring method as described above, it is possible to reduce radiation from the electrical equipment wire harness 13a of contact switching noise, slider noise, etc. that occur when switching on and off electrical components such as combination lamps. be able to.

This is because the noise signal from the electrical wiring harness 13a flows to the body panel 20 without being radiated into the interior of the vehicle. In addition, the pusher lid 52
By doing this, the capacity between the electrical equipment wire harness 13a and the body panel 20 is increased, and the noise signal from the electrical equipment wiring harness 13a is transferred to the body panel 20.
It is possible to increase the effect of flowing into the water.

Further, by separating the defogger wire harness 13b from the electrical equipment wire harness 13a, it is possible to prevent contact switching noise from being induced in the defogger wire harness 13b.

For example, if you bundle other harnesses into a harness with contact opening/closing noise, about 60% of the noise will be induced.
It has been confirmed that if the distance is 5 to 10 cm, it will decrease to about 10%.

FIG. 8 shows an embodiment in a rear parcel area in front of a trunk room of a vehicle having a rear differential camera and a radio antenna on the rear glass.

Here, the electrical components, namely the trunk room lamp 32, the air purifier 33, the speakers 31R and 3
There is no difference in the wiring method of each wire harness connected to the lamp 1L and the combination lamps 34R and 34L.

However, the wire harness 55 connected to the input terminal side of the inductor filter 27 for high frequency noise reduction is connected from the inductor filter 27 to the rear end of the vehicle of the rear parcel tray panel 26 like the conventional wire harness 25 shown in FIG. Along,
Wire harness 35L, 3 to connect to other electrical equipment
6, 37, 35R, etc., wires are routed from the terminal provided at the front end of the inductor filter 27 toward the right side wall of the vehicle along the rear seat body panel 41, and connected to electrical components. Separate from the wiring.

Also, wire harnesses 49R and 49 connected to the terminals of the defogger sensor 28 shown in FIG.
L is conventional wire harness 29R and 29L
Instead of forming the wire harness 38 together with the electrical equipment wire harness, the upper surface of the tray panel 26 is connected to the defogger sensor up 42 by wiring each independently facing the front of the vehicle, and the output wire 56 is connected to the wire harness. 55 to form the defogger wire harness 13b, and as described above, the electrical wiring harness 13a as a body harness.
Wire the wires to the side of the needle while keeping the distance between the two.

In addition, wires 49R and 49L are connected to the rear seat back body panel 41 (body panel 20) near the input terminal of the defogger sensor amplifier 42 or inside the unit of the defogger sensor amplifier 42.
Filter elements 57R and 57L made of ceramic capacitors or the like having a capacitance of about 0.01 .mu.F are interposed between the filter elements 57R and 57L, which are electrically connected to each other, to reduce noise.

By wiring the wire harness in this way, the wire harness 2 connected to the defogger
5R, 25L, 55, 56, 49R and 49L
(This is collectively referred to as the defogger wire harness 13b) and the electrical equipment wire harness 13a can be separated, so that the noise signal superimposed on the electrical equipment wire harness 13a is transmitted to the defogger wire harness 1.
3b is prevented.

Here, it has been experimentally found that if the filter elements 57R and 57L are inserted toward the output side of the defogger sensor amplifier 42, that is, toward the defogger wire harness 13b, the effect of inserting the filter elements becomes smaller. In addition, since the defogger wire harness at the rear of the vehicle from the rear seat back panel is wired on the top surface of the tray panel 26, and the electrical wiring harness is wired on the bottom surface of the tray panel 26, the tray panel 26 has a shielding effect. can be set.

The defogger wire harness 13b and the electrical equipment wire harness 13a form the main harness 2 at the dash side part F shown in FIGS. 1 and 2, but noise is induced from the electrical equipment wire harness 13a to the defogger wire harness 13b. Most of the time you can avoid it.

Although it is slight, the noise induced into the differential gear wire harness 13b by the main harness 2 can be avoided by installing an inductor filter 27 between the wire harnesses 25R and 25L of the rear differential gear 22 and 55 in the differential gear wire harness 13b. , and the wire harness 49R of the defogger sensor 28.
And 49L has a defogatsuga sensor amplifier 42.
By connecting capacitor filters 57R and 57L as noise prevention filter elements near the input terminal of the defogger and grounding the body, even a slight noise superimposed on the defogger wire harness can be removed.

Note that as the filter elements 57R and 57L used here, it is preferable to use ceramic capacitors with a capacitance of about 0.001 μF to 0.1 μF from a cost standpoint, and if the capacitance is smaller than this, the filter effect will be reduced. Moreover, if the capacitance becomes larger than this, there is a possibility that the operation of the sensor amplifier will be adversely affected.

In addition, the input wire harness 55 to the inductor filter 27 is connected to the output side wire harnesses 25R and 25 of the inductor filter 27 as in the conventional case.
If you pull it out from the rear of the vehicle together with L and bundle it together, the filter effect of the inductor filter 27 will be canceled due to the induction of noise between the input and output lines.
In this example, the wire harness 55 is drawn out from the vehicle front side of the inductor filter 27 as shown in FIG. 8, and the input and output lines are respectively taken out from the opposing surfaces of the filter case.

Note that the above is a way to prevent noise from entering the in-vehicle radio by wiring the wire harness behind the darts side, but noise may be caused by other routes such as direct radiation from the instrument harness Possible causes include noise entering the radio antenna.

However, it has been confirmed through experiments that the noise from such a path is extremely small. Therefore, in order to effectively reduce radio noise, the above-mentioned wiring method and interposition of a filter are sufficient.

Furthermore, since a shielded wire (not shown) is used from the antenna output terminal AT (see FIG. 4) to the in-vehicle radio (not shown), noise will not be mixed in from the shielded wire.

FIG. 9 is a comparison diagram of noise measured at the terminals of a radio speaker.

Here, the horizontal axis lists the operations of in-vehicle electrical components as noise generation sources. The vertical axis indicates the magnitude of generated noise expressed in terms of terminal voltage (Vp-p) at the speaker terminals of the radio. Moreover, the black circles are the measured values of noise according to the conventional example, and the white circles are the measured values of noise according to the embodiment of the present invention.

The displayed values are average values measured at several points in three AM broadcast band frequencies, and the arrows indicate the noise reduction effect achieved by implementing the present invention.

As is clear from this figure, the level of noise generated in the radio by various in-vehicle electrical components is uniformly reduced by employing the wiring method according to the present invention.

As explained above, according to the present invention, in the rear wire harness of a vehicle in which the rear differential gear and the radio antenna are integrated or provided close to each other, at least at the rear of the dashboard side,
The differential wiring harness is separated from the electrical wiring harness, and the electrical wiring harness in the body, that is, the body harness, is wired so as to be buried in the groove provided at the bottom of the body panel, so that the noise superimposed on the electrical wiring harness is eliminated. Since this prevents noise from being induced into the defogger wire harness, there is no need to select and insert a noise preventer for each individual electrical component as in the past, and the noise entering the car radio can be significantly reduced.

Furthermore, in addition to the above, the second invention provides a capacitor filter as a noise prevention filter element between the wire harness and the body panel, immediately before the wire harness connected to the defogger sensor is connected to the sensor amplifier. Therefore, the noise remaining in the defogger wire harness can be further reduced, and the noise reduction effect can be further enhanced.

It goes without saying that this invention can be applied to any of these types of vehicles, and this eliminates the need for noise countermeasures for each vehicle type and electrical component, which was required in the past, and also contributes to shortening the development period for new models. do.

[Brief explanation of the drawing]

Figures 1 to 5 are diagrams for explaining the conventional wire harness wiring method. FIG. 3 is a harness wiring diagram for the body side portion, and FIGS. 4 and 5 are harness wiring diagrams for the trunk room and rear parcel portion of a vehicle having a rear glass antenna. 6 to 8 are diagrams for explaining an embodiment of the present invention, FIG. 6 is a harness wiring diagram of the body side part, and FIG. 7 is an enlarged view taken along the line ~ in FIG. 6. The sectional view, FIG. 8, is a wiring diagram of the harness in the trunk room and rear parcel section. FIG. 9 is an explanatory diagram comparing the measured values of noise generation in a vehicle-mounted radio between the wiring of a conventional wire harness and the wiring of a wire harness according to the present invention. A... Right side of the engine room, B... Left side of the engine room, C... Engine section, D... Dash board section, E... Instrument section, F...
Datsushi side right side, G...Floor part, H...
Right side of body side, I...Left side of body side, J...Trunk room section, 2...Main harness, 13...Body harness, 13a...Electrical wiring harness, 13b...Default power supply wire harness, 20... Body panel, 21...Radio antenna, 22...Rear differential, 23...Rear glass, 26...Rear parcel tray panel,
27... Inductor filter, 28... Defogger sensor, 31R, 31L... Rear speaker, 3
2... Trunk room lamp, 33... Air purifier, 34R, 34L... Combination lamp, 41... Rear seat back body panel, 4
2... Defogatsuga sensor amplifier, 50... Groove, 5
1...butsuyu, 52...press lid, 57R, 57L
...Filter element.

Claims (1)

[Scope of Claims] 1. In wiring a wiring harness for a vehicle that has a rear differential camera, electrical components such as various lamps and various motors, and a radio antenna arranged on the rear glass and adjacent to or integrated with the rear differential camera. , a defogger wire harness associated with the rear defogger and an electrical wire harness connected to the electrical component are separated from each other at least in a region rearward of the vehicle from the dash side, and the electrical wire harness is embedded in a groove provided at the bottom of the body panel. A wiring harness wiring method characterized by wiring. 2. When wiring a wiring harness for a vehicle that has a rear defogger, electrical components such as various lamps and various motors, and a radio antenna that is disposed on the rear glass and is close to or integrated with the rear defogger, The defogger wire harness connected to the electrical component and the electrical component wire harness connected to the electrical component are separated from each other at least in a region rearward of the vehicle from the dashboard side, and the electrical component wire harness is embedded in a groove provided at the bottom of the body panel and wired. , an inductor filter is inserted in a harness for power supply to the rear defogger whose on/off is controlled by a signal obtained by amplifying the detection signal of the defogger sensor by a defogger sensor amplifier, and an inductor filter is inserted in the harness for power supply to the rear defogger which is controlled to be turned on/off by a signal obtained by amplifying the detection signal of the defogger sensor, and at least the input side of the defogger sensor amplifier is A method of wiring a wire harness, characterized in that a noise prevention filter element is interposed between the defogger wire harness near the terminal and the body panel.