JPH07212992A - Structure of feeding power to automobile door - Google Patents

Abstract

PURPOSE:To eliminate wiring between the body and doors of an automobile, by driving an inverter using a battery on the body side to generate alternating current and thereby excite a primary coil on the body side, and electromagnetically coupling it with a secondary coil on the door side to supply power to electrical equipment on the door side. CONSTITUTION:An inverter is driven using a battery mounted on the body 11 of an automobile to generate alternating current, and a primary coil 23 wound around a body-side iron core 21 is thereby excited. A door 12 is installed which is opened or closed through a hinge mechanism 13. An iron core 31 is installed on the door side, which is electromagnetically coupled with the body- side iron core 21 with a slight gap in-between when the door 12 is closed. A secondary coil 33 is wound around the door-side iron core 31. Electrical equipment on the door side are driven using power generated in the secondary coil 33. For example, a power window is opened or closed; the angle of a door mirror is adjusted; and door locking solenoids in the door 12 are driven. Control signals are transmitted between the body 11 and the door 12 by means of photocouplers 47, 48. This eliminates need for wiring between the body and the door and thus wire harnesses therefor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply structure for supplying electric power to electric components such as a power window device in a door.

[0002]

2. Description of the Related Art As a power feeding structure of this type, a structure shown in FIG. 8 is generally used. This is a standby state in which a grommet 4 is penetrated from a portion of the vehicle body 1 where the end surface of the door 2 on the hinge 3 side faces to lead out a wire harness 5, and a connector 6 provided at the tip of the wire harness 5 is attached to the door 2. The structure is such that it is connected to the connector 7, and power is supplied to the door 2 side via the power transmission cable in the wire harness 5.

[0003]

However, in the above-mentioned configuration, in the manufacturing process of the wire harness 5, a long electric wire has to be penetrated through the grommet 4 in advance, which causes a problem that it takes time to perform the work. Further, in the vehicle assembly process, the long wire harness 5 has to be penetrated through the hole provided in the panel of the vehicle body 1, and there is a problem that it takes time to perform the work.

The present invention has been made in view of the above circumstances, and its purpose is as follows. It is an object of the inventions of claims 1 to 4 to eliminate the troublesome work of penetrating a long electric wire, wire harness or the like into a hole by supplying electric power by so-called wireless. Further, the invention of claim 2 aims to increase power supply efficiency while enabling wireless power supply,
It is also an object of the inventions of claims 3 and 4 to supply electric power even when the door is open.

[0005]

A power supply structure for a door of a vehicle according to a first aspect of the present invention is a structure for supplying electric power from a battery in the vehicle body to a door provided on the vehicle body so as to be openable and closable. An inverter circuit provided on the vehicle body side for converting direct current power from the battery side into an alternating current, a primary coil provided on the vehicle body side through which alternating current from the inverter circuit flows, and magnetically coupled to the primary coil on the door side. And a secondary coil for supplying electric power to the electrical equipment on the door side.

According to a second aspect of the invention, in the above configuration,
The vehicle body side and the door side are provided with a vehicle body side iron core and a door side iron core whose ends are opposed to each other, and the primary coil and the secondary coil are wound around the vehicle body side iron core and the door side iron core, respectively. Have.

The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, an auxiliary battery for rectifying and charging the alternating current induced in the secondary coil is installed in the door. .

According to a fourth aspect of the present invention, in the second or third aspect of the present invention, one or both of the vehicle body side iron core and the door side iron core are movably provided so as to project toward the other side, and the door is opened. It is characterized in that it is biased by the biasing member so as to project accordingly.

[0009]

In any of the first to fourth inventions,
Direct current power from the battery side of the vehicle body is converted into alternating current by the inverter circuit and the alternating current is passed through the primary coil provided on the vehicle body side, so that an alternating magnetic field is generated around the primary coil. On the other hand, since a secondary coil is provided on the door side and it is in a position where it is magnetically coupled to the primary coil,
An alternating voltage is induced in the secondary coil. Therefore, non-contact (wireless) power is generated in the secondary coil on the door side,
This can be used as a power source to supply power to the electrical components on the door side.

According to the second aspect of the present invention, the primary and secondary coils are wound around the iron core, and both ends of the iron core are opposed to each other. In the open state, they form a closed magnetic circuit, and the leakage flux is greatly reduced.

According to the third aspect of the invention, the auxiliary battery in the door is charged by rectifying the alternating current induced in the secondary coil, so that the auxiliary battery can be used as a power source. In the invention of claim 4, when the door is opened, one or both of the vehicle body-side iron core and the door-side iron core move so as to project toward the other party, so that the magnetic coupling between the two iron cores is always high regardless of the opening of the door. Can be maintained in a state.

[0012]

The effects of the present invention are as follows. According to the inventions of claims 1 to 4, since electric power can be supplied to the secondary coil on the door side in a non-contact manner, a long electric wire, wire harness or the like is passed through a hole formed in the vehicle body or the door. It is possible to eliminate the troublesome work, and it is possible to improve the workability in the manufacturing process of the wire harness and the assembly process of the vehicle.

Further, according to the invention of claim 2, since the degree of magnetic coupling between the primary coil and the secondary coil is increased, the power transmission efficiency is rationalized while it is wireless power transmission. According to the third aspect of the invention, the auxiliary battery in the door can also be used as a power source for the electrical equipment on the door side. Therefore, for example, even if the structure is such that the degree of magnetic coupling between both coils is lowered by opening the door, it is possible to supply electric power to the electrical components even when the door is opened. Further, according to the invention of claim 4, the magnetic coupling between the two iron cores can be always maintained in a high state regardless of the opening of the door, so that the power can be continuously supplied by the wireless system even when the door is opened.

[0014]

【Example】

<First Embodiment> A first embodiment in which the present invention is applied to a door power supply structure in a two-door type passenger car will be described below with reference to FIGS. FIG. 1 shows a vehicle body 1
1 shows a structure in which a door 12 is attached to the driver's seat side, and the door 12 is a well-known structure that rotates around a hinge 13 to open and close the entrance / exit of the driver's seat. In the state where the door 12 is closed, the end plate portion 12a of the door 12 on the hinge 13 side faces the inner side wall portion 11a of the entrance / exit of the vehicle body 11 with a gap. Although not shown in FIG. 1 for simplification of the drawing, the door 12 is provided with electric components such as a known power window device, a door mirror drive device, and a door lock mechanism. That is, when the power window operating switch 14 shown in FIG. 3 is operated, the power window motor 15 is energized to drive the window glass 16 up or down, and when the door mirror operating switch 17 is operated, the door mirror motor 18 is energized to move the door mirror. The mirror angle can be adjusted, and when the door lock operation switch 19 is operated, the lock solenoid 20 in the door 12 is energized to lock the door 12.

Now, of the vehicle body 11, the inner wall portion 1 of the entrance / exit
As shown in FIG. 2, a vehicle body side iron core 21 is attached to the la 1 via a rubber grommet 22. The vehicle-body-side iron core 21 has a U-shaped columnar shape as a whole, and a primary coil 23 is wound around the center thereof.
The grommet 22 includes a housing tubular portion 22a that covers a tip portion of the vehicle body-side iron core 21, and a fixed claw portion 22 that projects rearward from the housing tubular portion 22a and has a tip end that engages with a bent portion of the vehicle body-side iron core 21.
b is integrally provided and is attached to both ends of the vehicle body side iron core 21. A frusto-conical large-diameter head 22c having a flat end surface is formed at the tip of the accommodating cylinder portion 22a, and a disc-shaped brim portion is separated from the large-diameter head 22c with a gap of a predetermined dimension. 22d is projected, and the vehicle body 1
The large-diameter head 22c is penetrated through the through-hole 31 formed in the inner wall portion 11a of No. 1 to form the large-diameter head 22c and the flange portion 22d.
The grommet 22 is attached to the inner wall portion 11a with the inner peripheral edge portion of the inner wall portion 11a sandwiched between and. In this mounted state, both ends of the vehicle body side iron core 21 are
The vehicle body 1 with a predetermined size protruding from a toward the door 12 side
It is fixed to 1.

On the other hand, a door side iron core 31 is also attached to the end plate portion 12a of the door 12 on the hinge 13 side via a grommet 32. This door-side iron core 31 has a U-shape similar to the vehicle-body-side iron core 21, has the same dimension between both ends, and has a secondary coil 33 wound around the center thereof. Further, the grommet 32 is also the grommet 2 for the vehicle body side iron core 21.
2 has the same structure as shown in FIG.
1 is fixed to the end plate portion 12a of the door 12. In the figure, the grommet 22 is attached to each part of the grommet 32.
The same parts are indicated with the same subscripts. Both iron cores 2
When the door 12 is closed as a result of the attachments 1 and 31 as described above, as shown in FIG.
Grommet 2 between both ends of the door and both ends of the iron core 31 on the door side.
The two iron cores 2 have a shape in which they are opposed to each other through the large-diameter heads 22c and 25c of 2, 25 and are continuous in a rectangular shape.
A magnetic circuit passing through 1, 31 is configured.

The electrical structure is as shown in FIG. 3, and the battery 41 provided in the vehicle body 11 is connected to an inverter circuit 42 for converting direct current into alternating current, and the alternating current output thereof is the vehicle body side iron core 21. Primary coil 23 wound around
Applied to. The inverter circuit 42 is a CPU
The operation is controlled based on the signal from 43 as described later. On the other hand, the secondary coil 33 wound around the door-side iron core 31 is connected to the rectifier circuit 44 and rectifies the AC voltage induced in the secondary coil 33 to relay the relay circuit 4.
The DC power can be supplied to the power window motor 15, the door mirror motor 18, and the locking solenoid 20 described above via 5. The switching operation of the relay circuit 45 is controlled based on a signal from the CPU 46 provided in the door 12.
The PU 46 includes the power window operation switch 14 and the door mirror operation switch 1 provided on the door 12 as described above.
7 and the signal from the door lock operation switch 19 are given.

Further, the CPU 46 is connected with a light emitting / receiving element 47 consisting of an LED and a photodiode, which is attached to the end plate portion 12a of the door 12 as shown in FIG. On the other hand, a similar light emitting / receiving element 48 is also connected to the CPU 43 on the vehicle body 11 side, and is attached to the inner wall 11a of the vehicle body 11 at a position facing the light emitting / receiving element 47 on the door 12 side. CPU4
Necessary information can be exchanged between 3 and 46. That is, for example, when the LED of the light emitting / receiving element 48 on the vehicle body 11 side emits light based on the signal from the CPU 43, the light is incident on the photodiode of the light emitting / receiving element 47 on the door 12 side and is photoelectrically converted here. Signal is the CPU on the door 12 side
46, and vice versa.

The above is the door 12 on the driver's side.
As described in detail above, the door on the passenger side of the vehicle is also equipped with the same configuration as the driver's side, except that the door mirror operation switch is not installed. In these electrical configurations, the same parts as those on the driver's seat side are designated by the same reference numerals, and FIG.
The rectifier circuit 4 converts the alternating current from the secondary coil 33.
4 is rectified and can be supplied to the power window motor 15, the door mirror motor 18 and the solenoid 16 via the relay circuit 45. The CPU 46 for controlling the relay circuit 45, the light emitting / receiving element 47 and A power window operation switch 14 is provided.

The present embodiment is constructed as described above, and its operation is as follows. For example, in order to lower the window glass 16 on the driver's seat side to open the window, the power window operating switch 14 provided on the door 12 is operated in the lowering direction. Then, from the CPU 46 on the door 12 side, the light emitting / receiving elements 47, 48
A power transmission start signal is given to the CPU 43 on the vehicle body 11 side via the, and the inverter circuit 42 operates based on this signal.
Then, the direct current from the battery 41 is converted into alternating current and is passed through the primary coil 23, and an alternating magnetic field is generated around it. Here, the primary coil 23 is the body side iron core 21.
Also, since it is magnetically coupled to the secondary coil 33 via the door-side iron core 31, an AC voltage according to the turn ratio of both coils is induced in the secondary coil 33. The AC voltage is rectified by the rectifier circuit 44, converted into a direct current, and given to the relay circuit 45. On the other hand, the CPU 46 on the door 12 side outputs the power transmission start signal to the CPU 43 on the vehicle body 11 side as described above, and also outputs the power window motor energization signal to the relay circuit 45. As a result, the relay circuit 45 operates and the power window motor 15 is driven by the DC power from the rectifier circuit 44, and the window glass 16
Goes down. When the power window operation switch 14 is released, the relay circuit 45 disconnects the power window motor 15 to stop the window glass 16, and
A power transmission stop signal is output from U46 to the CPU 43 through the light emitting / receiving elements 47 and 48, the operation of the inverter circuit 42 is stopped, and power transmission to the door 12 side is stopped.

Although not shown in detail, a current sensor is provided in the energization path to the power window motor 15, and when the window glass 16 is in a state where a foreign matter is caught, a current flowing into the motor 15 is generated. The CPU 46 operates the relay circuit 45 to cut off the power window motor 15 and outputs a power transmission stop signal to the CPU 43 on the vehicle body 11 side to operate the inverter circuit 42. Stop.

When the door mirror operation switch 17 or the door lock operation switch 19 is operated, the inverter circuit 42 operates to transmit the electric power from the battery 41 and the relay circuit 45 performs the switching operation in the same manner as described above. The corresponding motors 15 and 18 or the locking solenoid 20 are driven. Also, if
When a switch operation is performed such that a plurality of electric components such as the power window motor 15, the door mirror motor 18, the locking solenoid 20 and the like operate simultaneously, the CPU on the door 12 side
46 outputs a signal to the CPU 43 on the vehicle body 11 side to output the CPU
The switching element 43 controls the switching element in the inverter circuit 42 to switch with a large duty ratio, and thus can supply a larger amount of electric power to the door 12 than when a single electric component is operating.

In order to adjust the angle of the passenger side door mirror, the door mirror operating switch 17 provided on the driver side door 12 is operated. Then, the driver's side door 12
While the power transmission start signal is output from the CPU 46 on the side of the vehicle to the inverter circuit 42 via the CPU 43 on the side of the vehicle body 11,
An energization signal of the door mirror motor 18 is output to the relay circuit 45 via the CPU 46 of the passenger side door to drive the door mirror of the passenger side door.

As described above, according to this embodiment, the electric power for the electric components such as the power window device provided on the door 12 side is supplied in a non-contact manner through the magnetic coupling between the primary coil 23 and the secondary coil 33. be able to. Therefore, needless to say, a cable for power transmission, which is required in the conventional wired power supply system, and a grommet, a connector, or the like for penetrating the cable into the vehicle body 11 or the door 12 are not necessary, and the wire harness 5 can be used accordingly. In addition to simplifying the manufacturing process, the work for assembling the vehicle can be simplified because there is no need to insert the power transmission cable through the hole.

Further, particularly in this embodiment, the primary coil 23
And the secondary coil 33 to the vehicle body side iron core 21 and the door side iron core 3
Since the cores are wound around 1 and both ends of the iron cores 21 and 31 are opposed to each other, the degree of magnetic coupling between the coils 23 and 33 is high, and highly efficient power transmission is possible.

<Second Embodiment> FIG. 4 is a view corresponding to FIG. 3 showing a second embodiment of the present invention. The difference from the first embodiment is that the auxiliary battery 50 is provided in the output line of the rectifier circuit 44 provided on the door 12 side. The output line of the auxiliary battery 50 is connected to the CPU 46 to monitor the voltage of the auxiliary battery 50.
When the battery voltage of 1 falls below a predetermined value, the CPU 46 outputs a power transmission start signal to the CPU 43 on the vehicle body 11 side via the light projecting / receiving elements 47, 48 to operate the inverter circuit 42. As a result, an AC voltage is applied from the inverter circuit 42 to the primary coil 23 and an AC voltage is induced in the secondary coil 33,
This is rectified by the rectifying circuit 44 and the auxiliary battery 50 is charged, so that the auxiliary battery 50 is always in a charging completed state.

When the power window operating switch 14 of the door 12 is operated, the CPU 46 outputs a power window motor energization signal to the relay circuit 45, and the relay circuit 45 is activated to cause the power window motor 15 to operate. It is driven by DC power from. Further, when the door mirror operation switch 17 or the door lock operation switch 19 is operated, the motor 15,
18 or the locking solenoid 20 is driven. The other parts of the configuration are the same as those of the first embodiment, and therefore, the same parts are designated by the same reference numerals and the duplicate description will be omitted.

As described above, in the second embodiment, when the voltage of the auxiliary battery 50 drops, the auxiliary battery 50 is charged to keep the auxiliary battery 50 in a sufficiently charged state, and the electrical components on the door 12 side are operated. When this is done, the auxiliary battery 50 can be used as a power source. For this reason,
For example, even when the door 12 is opened and the degree of magnetic coupling of the coils 23 and 33 becomes low, the electrical components on the door 12 side can be operated. Moreover, when the electric equipment such as the power window device is not used, the auxiliary battery 50 can be gradually charged by receiving power transmission from the vehicle body 11 side, so compared to the configuration in which electric power is transmitted only for a short time when the electric equipment such as the power window device operates. Therefore, the transmission current can be reduced. As a result, both the primary and secondary coils 23, 33 and the two iron cores 21,
It becomes possible to downsize 31.

<Third Embodiment> FIGS. 5 to 7 show a third embodiment of the present invention. The difference from the first embodiment is that the vehicle body side iron core 60 is configured to be movable as the door 12 is opened and closed. In this embodiment, the vehicle body side iron core 6
0 has a U shape as a whole, but as shown in FIG.
Compared with the vehicle-body-side iron core 60 of the first embodiment, both ends are arcuately extended and extended. The vehicle-body-side iron core 60 is attached to the vehicle body 11 via two grommets 61 so that the centers of curvature of the arcuate extensions 60a at both ends coincide with the center of rotation of the door 12. The grommet 61 has a guide tube portion 62 at the tip, and the guide tube portion 62
Is a structure in which a gutter-shaped arc-shaped guide cover 63 is integrally extended backward, and each arc-shaped extension portion 60a of the vehicle body side iron core 60 is penetrated through each guide cylinder portion 62, and the guide cover 63 of the upper grommet 61 is formed. Is positioned so as to cover the upper half of the upper arcuate extension 60a of the vehicle body-side iron core 60, and the guide cover 63 of the lower grommet 61 has a lower arcuate extension 6a.
It is located so as to cover the lower half of 0a, and thus supports the vehicle body side iron core 60 so as to project or retreat toward the door 12 side. Further, between the cover 33a of the secondary coil 33 wound around the vehicle body side iron core 60 and the tip side of each grommet 61, as shown in FIGS. Are thus bridged, and thus the body-side iron core 60 is always biased in a direction projecting from the body 11.

The door-side iron core 31, the grommet 32 therefor, and other electrical structures are the same as those in the first embodiment, and the same parts are designated by the same reference numerals and their duplicate description will be omitted.

In this embodiment, when the door 12 is closed, as shown in FIG. 6, the vehicle body side iron core 60 elastically extends the tension spring 64 and the vehicle body 1
It is pushed in so that it may move backwards in 1. For this reason,
The tip of the arcuate extension portion 60a of the vehicle body side iron core 60 is urged by the spring force of the tension spring 64 and abuts on the large diameter head portion 32c of the grommet 32 on the door 12 side, and eventually the tip of the large diameter head portion 32c. Door side iron core 31 through the thin portion
Is facing the tip of the. As a result, a magnetic circuit having a high degree of coupling is configured as in the first embodiment, and electric power is transmitted from the vehicle body 11 side to the door 12 side with high efficiency. When the door 12 is opened from the above state, the door 12 is hinged 13.
The end plate portion 12a on the door 12 side is rotated around the
7 is separated from the inner wall portion 11a so as to open, and the distal end of the door-side iron core 31 moves so as to retract from the inner wall portion 11a. As a result, the vehicle body side iron core 60 is pushed out by the spring force of the tension spring 64 so as to project from the inside of the vehicle body 11, and the tip end thereof is pushed out.
The state facing the tip of 1 is maintained. Therefore, the door 12
Regardless of the open state, the iron cores 60 and 31 form a magnetic circuit, so that power can be transmitted from the vehicle body 11 side to the door 12 side with high efficiency.

As described above, according to this embodiment, in addition to the effect described in the first embodiment, power can be transmitted even when the door 12 is opened, so that the electrical components on the door 12 side can be used during that time. The effect that it can be obtained is also obtained.

<Other Embodiments> The present invention is not limited to the above-mentioned respective embodiments, but can be carried out, for example, in the following constitutions, and these are also embodiments included in the present invention.

(A) In addition to the configuration shown in each of the above embodiments, the winding ratio of the primary coil and the secondary coil may be increased. By doing so, the AC voltage induced in the secondary coil becomes large, so a small current is required even when the same electric power is sent, and in the end, the size of the electric wire connected to the electrical components inside the door is made smaller to reduce costs. Can be possible.

(B) When the electrical equipment is an AC drive type in each of the above embodiments, the rectifier circuit 44 can be omitted, and the cost can be reduced accordingly. Even in this case,
Although it is necessary to supply the DC power to the CPU 46, the power is extremely small, so that the cost of the rectifier circuit can be reduced as compared with that for power.

(C) In the third embodiment, the vehicle body side iron core 6
Although 0 is movably supported with respect to the vehicle body, the present invention is not limited to this, and conversely, door side iron core 31 may be movably supported with respect to door 12, or vehicle side iron core 60 and Both of the door-side iron cores 31 may be movable, and the structure therefor is similar to that of the third embodiment.
The structure of 1 can be adopted.

(D) In each of the above embodiments, C on the door 12 side
Although a signal is transmitted between the PU 46 and the CPU 43 on the vehicle body 11 side through the light projecting / receiving elements 47 and 48, this is not essential and may be provided as necessary. Further, it goes without saying that such signal transmission can be performed by using other information transmission media such as radio waves, magnetic fields, and ultrasonic waves without necessarily performing the optical method.

(E) In each of the above embodiments, the primary and secondary coils are wound around the U-shaped iron core. However, the shape of the iron core is not limited to this, and may be E-shaped or I-shaped. If the power required by the electrical components is small,
It is also possible to increase the output frequency of the inverter circuit and configure the ironless core.

Besides, the present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be carried out without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing primary and secondary coils together with an iron core.

FIG. 3 is a block diagram of the first embodiment.

FIG. 4 is a block diagram of a second embodiment.

FIG. 5 is a perspective view showing a third embodiment.

FIG. 6 is a cross-sectional view showing the main part of the third embodiment with the door closed.

FIG. 7 is a transverse cross-sectional view showing the main parts of the third embodiment with the door open.

FIG. 8 is a perspective view showing a conventional power supply structure.

[Explanation of symbols]

 11 ... Vehicle body 12 ... Door 21 ... Vehicle side iron core 23 ... Primary coil 31 ... Door side iron core 33 ... Secondary coil 42 ... Inverter circuit 44 ... Rectifier circuit 47, 48 ... Emitter / receiver element 50 ... Auxiliary battery

Claims (4)

[Claims] 1. A structure for supplying electric power from a battery in the vehicle body to a door provided on the vehicle body so as to be openable and closable, and converting direct-current power from the battery side provided on the vehicle body side into alternating current. An inverter circuit, a primary coil provided on the vehicle body side to which an alternating current from the inverter circuit flows, and an electric circuit provided on the door side so as to be magnetically coupled to the primary coil to supply electric power to electrical components on the door side. A power supply structure for a vehicle door including a secondary coil. 2. The vehicle body side and the door side are provided with a vehicle body side iron core and a door side iron core whose ends are opposed to each other, and a primary coil and a secondary coil are wound around the vehicle body side iron core and the door side iron core, respectively. Claim 1 characterized by the above.
Power supply structure to the vehicle door described. 3. A structure for supplying electric power to a door of a vehicle according to claim 1, wherein an auxiliary battery for rectifying and charging an alternating current induced in a secondary coil is mounted in the door. . 4. One or both of a vehicle body side iron core and a door side iron core are movably provided so as to project toward the other side, and are biased by a biasing member so as to project when the door is opened. The structure for supplying power to a door of a vehicle according to claim 2 or 3, wherein: