JPS5820568A - Wiring method of wire harness - Google Patents

Abstract

PURPOSE:To suppress noises mixed into a car radio by separating a wire harness into a befogger wire harness and an electric installation wire harness in a car arranged with the rear defogger and a radio antenna on a rear glass face. CONSTITUTION:A plurality of radio antenna wires and a rear defogger are both conductor-printed on the car compartment side of a rear glass at the back of a car so that the rear defogger can be also utilized as an antenna to improve the sensitivity of the radio in the AM band. In such an installation, a groove 50 is provided on the side section of a body panel 20 bottom at the back of the car from a dash side. An electric installation wire harness 13a is buried in this groove 50, and a defogger wire harness 13b is laid about 5cm apart from the harness 13a. Thereby, contact on/off noises or sliding piece noises generated during on/off switching operations of electric equipment such as combination lamps, etc. are suppressed from being radiated from the harness 15a.

Description

[Detailed Description of the Invention] The present invention relates to a wiring harness wiring method for a vehicle.
In particular, in vehicles in which the rear defogger and the radio antenna are integrated into the rear glass surface or are arranged close to each other,
The present invention relates to a wiring harness wiring method that prevents the generation of radio noise.

Since vehicles generally have a large number of radio noise sources, various measures have been taken, such as incorporating noise prevention equipment into each of the noise generating devices.

Particularly in these days when car radios have become essential accessories for vehicles, if the radio's performance is hampered by such noise, it will also affect the commercial value of the vehicle itself, so radio noise has traditionally been Various studies have been conducted to suppress it.

Therefore, first, the conventional technology will be explained.

Figure 1 shows an outline of the wiring diagram for 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 section C, the dash section, the instrument section E, and the right side of the dash side. It also consists of a section F, a floor section G, a right side body side H, a left side body side ■, and a trunk section J.

Then, in part A, there is a battery 1. Main No-ness 2, B
Main Honeyness 6.0 Part EGI...-ness 4
, a switch harness 5 is provided in the E section, an instrument harness 6 is provided in the F section, and a body harness 16.5 is provided in the H section.

FIG. 2 is a wiring diagram of the right side portion F of the dash. In addition to the instrument harness 6, this F section includes K, a room lamp harness 7, a fuse box 8° time control unit 9. Auto door lock timer 10. There is a power window timer 11.

゛ The body harness 16 is separated from the air conditioner/audio harness 12 going to the dash at the right side F of the dash, and the body harness 16 after this is separated from the air conditioner/audio harness 12 going to the dash.
are all bundled and wired on the body panel 20.

FIG. 3 is a wiring diagram of a conventional body harness 16 on the right side H of the body. In this H section, the handbrake harness 14 and the seatbelt harness 15 are separated from the body harness 16.

Here, 16 is a handbrake, 17 is a control box, and 18 is a door.

Figures 4 and 5 show an example of conventional wire harness wiring for a vehicle that has a rear defogger and a radio antenna on the rear window. Indicates the line condition, the fifth
The figure shows the wiring state looking down at the rear of the vehicle from above the parcel tray panel.

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

In other words, the thick solid lines indicate the wiring connected to the radio antenna and the rear defogger-related equipment, and the thick broken lines indicate the radio and rear defogger-related wiring arranged on the back side of the shield as seen from the viewpoint. shall be. Also, two parallel solid lines indicate lights, lamps, speakers,
Indication of wiring connected to motor and air purifier, etc., 2
The parallel dashed lines in the book indicate the lines of the lights, etc. installed on the back side of the shielding body when viewed from the viewpoint.

In FIG. 4, 21 is a radio antenna, and 22 is a rear defogger. These multi-wire radio antenna 21 and rear defogger 22 are both printed with conductors on the passenger compartment side of the rear glass 26 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 26, respectively. There is.

In this way, connect the radio antenna 21 to the rear defogger 22.
By using the rear defogger 22 as an antenna, the radio antenna 2 can be electrically integrated with the rear defogger 22.
This is to improve the sensitivity in the AM band No. 1.

In addition, in FIG. 4, AT is an antenna output terminal,
It 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 parcel tray panel (hereinafter simply referred to as "tray panel") 26, and the wire harness 25R is connected to the defogger power supply terminal 24L. Tray panel 2 with a wire connection 25L connected to
6 is guided to an inductor filter 27 for reducing high frequency noise provided at the bottom of the filter 6. Kogara wire harness 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 defogger 22. The rear defogger 22 is turned on and off based on the sensor signal detected by the defogger sensor 28. The wire harnesses 29R and 29L connected to both terminals of the defogger sensor 28 pass through the tray panel 26, and then form a wire harness 60 together with the wire harness 25 described above on the lower surface thereof.

In the following description, these defogger-related wire harnesses 25R, 25L, 25, and 29R will be described.

29L and 30 are collectively called a defogger wire harness. i Also, in Figures 4 and 5, 31R and 51
L is the rear speaker, 62 is the trunk room lamp,
66 is an air purifier. 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 65L1 connected to rear speakers 31R and 31L, and wires 66 and 37 connected to trunk lamp 62 and air purifier 66, respectively, are connected to tray panel 26.
are bundled at the rear of the lower surface of the wire harness 68, and then bundled together with the wire harness 30 described above one after another to form a wire harness 68.

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 K, the two wire harnesses 39R and 39L connected to the combination lamps 34R and 34L are 1
After the rear right side wall of the vehicle is guided toward the tray panel 26, it is combined with the wire harness 68 on the lower surface of the tray panel 26 to form the rear main harness 40, and the upper surface of the rear seat back body panel 41 is connected to the front of the vehicle. Wires are laid out towards.

Here, among the wire harnesses forming the rear main harness 4o, the default gas sensor amplifier 42 is inserted between the wire harnesses 29R and 29L connected to the default gas sensor 28 in the middle of the wiring of the rear main harness 4o. equipped.

In addition, in the following explanation, wire harnesses 35R, 35L, 36, 37, 39R, and 69 connected to electrical components are used.
When L is 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 harness 25. which is connected to the rear defogger 22 and the defogger sensor 28. - Wire harness 60 that bundles 29R and 29L is connected to speakers 31R and 31L, )' rank room lamp 32. In addition, the wire harness 39R-, 69'L, etc. connected to various electrical components such as the air purifier 66 are bundled together over a long section as shown by diagonal lines to form the rear main harness 40. There is.

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. It is guided to the wire harness of the rear defogger 22 and the defogger sensor 28, and further mixes into the radio antenna 1. 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 wiring harness from each other at least in the body harness portion at the rear of the vehicle from the dash side, so that the defogger wire harness and the electrical wiring harness are separated from each other at least in the body harness portion located at the rear of the vehicle from the dash side, so that the wire harness and the electrical wiring harness are separated from each other at least in the body harness portion located at the rear of the vehicle from the dash side. In order to prevent contact opening/closing noise, slider noise, etc. from being radiated from the electrical component wires, the electrical wiring harness is buried in the groove in the body panel and wired. To provide a wire harness wiring method that prevents noise from entering a car radio by preventing generated noise from being guided from a body harness and an electrical equipment wire harness to a defogger wire harness.

In addition to the above, the second invention further includes an inductor filter inserted in the power supply harness to the rear defogger, and a signal obtained by amplifying the detection signal of the Naya defogger sensor to control on/off of the rear defogger. Wiring of a wire harness in which a filter element for noise prevention is interposed between the Defo Tsuga wire harness at least near the input terminal on the input side of the Defo Tsuga sensor amplifier and the body panel to further enhance the noise reduction effect. provide a method.

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 this invention, in which a groove 50 is provided in the side part of the bottom of the body panel 20 at the rear of the vehicle from the dash side, and the electrical wiring harness 13a is inserted into the groove 50. Embed. In addition, at least five wire harnesses are connected to the default wire harness 13b from the electrical wiring harness 13a.
Wire at a distance of cTL or more. That is, the conventional body harness 13 is divided into an electrical equipment wire harness 13a and a defogger wire harness 15b, and the wires are wired separately from each other.

In FIG. 7, 51 is a bushing, and 52 is a bolt for pressing the cover 153 for pressing the electrical wiring harness 13a into the groove 50 of the body panel 20. This presser cover 52 is provided at three locations in Fig. 6, but
Provide at least one location at the rear of the vehicle on the body harness. The size of the groove 50 is 1.5 to 2CrfL in depth and 3 in width.
~5CTL is appropriate.

By using the wiring method as described above, it is possible to reduce radiation from the electrical equipment wire harness 13a of contact opening/closing noise, slider noise, etc. that occur during on/off switching operations of electrical components such as combination lamps. I can do it.

This is because the noise signal from the electrical wiring harness 13a is not radiated into the interior of the vehicle, but instead flows to the body panel 20. Further, by using the pusher lid 52, the capacity between the electrical equipment wire harness 13a and the body panel 20 can be increased, and the effect of flowing the noise signal from the electrical equipment wire harness L5a to the body panel 20 can be increased.

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, in a harness where contact opening/closing noise occurs, other...
When bundled, it receives about 60% guidance and reaches 5 to 10 m.
It has been confirmed that if the distance is removed, it will decrease to about 10%.

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

Here, electrical components, such as a trunk room lamp 62, an air purifier 63. The wiring method of each wire harness connected to the speakers 31Ft and 61L and the combination lamps 34R and 34L is unchanged from the conventional method.

However, the wire harness 55 connected to the input terminal side of the inductor filter 270 for high frequency noise reduction is different from the conventional wire harness 25 shown in FIG.
Do not route the wires along the rear end of the vehicle together with the wire harnesses 35L, 36°67, 35R, etc. connected to other electrical components (from the terminal provided on the front end of the vehicle of the inductor filter 27 to the rear seat). The wiring is routed along the back body panel 41 toward the right side wall of the vehicle, and is separated from wiring related to electrical components.

Furthermore, the wire harnesses 49R and 49L connected to the terminals of the defogger sensor 28 shown in FIG. Then, the upper surface of the tray panel 26 is directed toward the front of the vehicle and connected to the defogger sensor amplifier 42, and its output line 56 is combined with the wire harness 55 to form the defogger wire harness 13b, which is connected to the body harness as described above. The wires are wired to the dash side part while being separated from the electrical equipment wire harness 13a.

In addition, noise reduction is performed between the wires 49R and 49L and the carrier seat back panel 41 (conducted with the body panel 20) near the input terminal of the default sensor amplifier 420 or inside the unit of the default sensor amplifier 42. For this purpose, filter elements 57R and 57L made of ceramic capacitors or the like having a capacitance of about 001 μF are interposed.

By wiring the wire harness in this way, the wire harnesses 25R, 25L, which are connected to the defogger,
55, 56, 49R and 49L (collectively referred to as the defogger wire harness 13b) and the electrical wiring harness 13a can be separated, so that noise signals superimposed on the electrical wiring harness 15a are guided to the defogger wire harness 13b. be prevented from being

Here, it has been experimentally found that if the filter elements 57R and 57L are inserted on 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, the defogger wire harness at the rear of the vehicle from the rear seat back panel is wired to the top surface of the tray panel 26, and the electrical wiring harness is wired to the bottom surface of the tray panel 26, so the tray panel 26 is shielded. It can have an effect.

The default wire harness 13b and the electrical wiring harness 13a are the first. Dash side part F shown in Figure 2
Although the main noise 2 is formed in this way, it is possible to almost avoid noise being induced into the electrical equipment wire harness 13a or the defogger wire harness 13b.

Although it is slight, the noise induced in the defogger wire harness 13b by the main noise 2 can be removed by installing an inductor filter 27 between the rear defogger wire harnesses 25R and 25L of the defogger wire harness 13b and 55. In addition, capacitor filters 57R and 57L as noise prevention filter elements are connected to the wire harnesses 49R and 49L of the defogger sensor 28 near the input terminal of the defogger sensor amplifier 420 and grounded to the body. It is also possible to remove noise that is slightly superimposed on the image.

Note that the filter elements 57R and 57I used here
, is 0. It is preferable to use a ceramic capacitor with a capacitance of about OO1pP-0.1μF from a cost perspective.If the capacitance is smaller than this, the filter effect will be reduced, and if the capacitance is larger than this, the operation of the sensor amplifier will be affected. There is a risk that it may have an adverse effect on

Furthermore, if the input wire harness 55 to the inductor filter 27 is pulled out from the rear of the vehicle and bundled together with the output side wire harnesses 251"L and 25L of the inductor filter 27 as in the past, noise will be induced between the human output lines. Therefore, in this example, the wire harness 55 is pulled out from the vehicle front side of the inductor filter 27 as shown in FIG. 8, and the input/output wires are connected to the opposite surface of the filter case. I try to take them out from each.

Note that the above has been designed to prevent noise from entering the in-vehicle radio by wiring the wiring harness behind the dash side, but there are other ways in which noise can enter, such as direct radiation from the instrument harness. This may be due to 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.

Further, 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 terminal voltage (Vp-p) at the speaker terminal 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 the 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 defogger and the radio antenna are integrated or provided close to each other, the defogger wire harness can be connected to the electrical wiring harness at the rear of the dash side. Furthermore, the electrical wiring harness of the body is buried in the groove provided at the bottom of the body panel, so that the noise superimposed on the electrical wiring harness is removed from the defogger wire harness. −
- Since the noise is not induced by noise, there is no need to select and insert a noise suppressor for each individual electrical component, as was the case in the past. (Noise entering the car radio can be significantly reduced.)

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

It should be noted that this invention can of course be applied to any of these types of vehicles.
This eliminates the need for noise countermeasures for each electrical component, contributing to shortening the development period for new models.

[Brief explanation of drawings]

1 to 5 are diagrams used to explain the conventional wiring method. Ness distribution diagram, 6th
The figure is a harness wiring diagram of a body side part, and FIGS. 4 and 5 are harness wiring diagrams of a trunk room and a rear bar cell part of a vehicle having a rear glass antenna. 6 to 8 are diagrams for explaining the present invention in detail. FIG. 6 is a wiring diagram of the body side portion, and FIG. 7 is a diagram of ■ to ■ in FIG. 6. FIG. 8, which is an enlarged sectional view taken along the line 5, is a wiring diagram of the trunk room and rear cell section. FIG. 9 is an explanatory diagram comparing the measured values of noise generation in a vehicle-mounted radio between the conventional wire harness wiring and the wire harness wiring according to the present invention. A... Engine room right side B...
... Engine room left side C ... Engine section D ... Dash board section E ...
・・Instrument part F・・・・Dash side right side G・・Floor part H・・・Body side right side ■・・・・Body Side left side J......Trunk room section 2...
...Main wire harness 16...Body wire harness 13a...Electrical wiring harness 13b...Default wire harness 20 ...Body panel 21"°°°...Radio antenna 22...Rear defogger 26.
......Rear glass 26......Rear parcel tray quenchnel 27...Inductor filter 28...Defog sensor 3iR, 31L...Rear Speaker 62...
...Trunk room lamp 36...Air purifier 34R, 34L...Combination lamp 41...Rear seat back body panel 42... ... Defogger sensor amplifier 50 ... Groove 51 ... Bush 52 ... Lid 57R, 57L ... Curved filter element 114wJ Fig. 5 Fig. 8 + 3b Fig. 9

Claims (1)

[Scope of Claims] 1. When wiring a wire harness for a vehicle that has a rear defogger, electrical components such as various lamps and various motors, and a radio antenna disposed on the rear window in the vicinity of or integrated with the rear defogger. , a defogger wire harness associated with the rear defogger and an electrical equipment wire harness connected to the electrical equipment,
A method of wiring a wire harness, characterized in that the wiring harnesses are spaced apart from each other at least in a region rearward of the vehicle from the dash side, and are embedded in grooves provided at the bottom of a body panel. 2. When wiring a wire harness for one car that has a rear defogger, electrical components such as various lamps and various motors, and a radio antenna that is disposed on the rear window and is adjacent to or integrated with the rear defogger. The defogger wire harness associated with the rear defogger and the electrical wire harness connected to the electrical component are separated from each other at least at the rear of the vehicle from the dash side, and the electrical wire harness is placed in a groove provided at the bottom of the body panel. In addition to embedding and wiring, an inductor filter is inserted in the harness for power supply to the rear defogger whose on/off is controlled by a signal obtained by amplifying the detection signal of the 4M defogger sensor with a defogger sensor amplifier. A method of wiring a wire harness, comprising interposing a noise prevention filter element between the defogger wire harness and a body panel at least near an input terminal on the input side of a defogger sensor amplifier.