JPH10273015A - Transceiver for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve communication performance. SOLUTION: The key grip 4a of a key 4 is provided with a transponder 5 to communicate with a vehicle side electromagnetic junction type transmitter and a key side electric wave transmitter 6 to communicate with a vehicle side electric wave receiver. The ring-like antenna coil 9a of the electromagnetic junction type transmitter is molded in the part of a key cylinder lock 24, and magnetic bodies 28 and 29 are provided in the extension piece sections 26, 27 extending to positions opposing to both ends of the key grip 4a respectively. The magnetic body 28 is positioned between the antenna coil 9a of the electromagnetic junction type transmitter and the electromagnetic junction coil 13a of the transponder 5, and the electro magnet 29 is positioned between the antenna coil 9a and the electromagnetic junction coil 23a of the key side electric wave transmitter 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle transmitting / receiving apparatus for performing communication by electromagnetic coupling between a vehicle and a key.

[0002]

For example, in a communication device that performs two-way communication by contact between a vehicle and a key, a transmission signal in which pulse data is superimposed on a power signal (magnetic field signal) on a vehicle. Is provided, and a transponder is provided as a receiving means on a key side such as an ignition key or a door key. In this case, the electromagnetic coupling type transmitter has an antenna coil for transmitting the transmission signal on the key cylinder lock portion, and the transponder has an electromagnetic coupling antenna for receiving the transmission signal in the key grip. Provided.

[0003] The electromagnetically coupled transmitter performs a transmitting operation when a key is inserted into a key rotor on the vehicle side.
When the transponder is provided with a transmission signal from the electromagnetically coupled transmitter, the transponder generates operating power in response to the reception of the power signal, and becomes active with the operating power, thereby causing the signal content of the received signal to be increased. In response to the request, or write data to a non-volatile memory provided in the transponder.

By the way, when communication is performed between the antenna coil of the electromagnetic coupling type transmitter and the electromagnetic coupling antenna of the key, since the communication is performed by electromagnetic coupling as described above, the key is held in the key holder together with the other keys. In such a case, the passage of magnetic flux from the antenna coil of the electromagnetic coupling type transmitter to the electromagnetic coupling antenna of the key may be impeded by the above-mentioned other keys or the like, and the communication performance may be degraded.

Accordingly, a first object of the present invention is to provide an electromagnetically coupled transmitter provided on a vehicle and a transponder provided on a key side for performing communication by electromagnetic coupling.
It is an object of the present invention to provide a vehicle transmitting / receiving device capable of improving communication performance.

On the other hand, as another vehicle transmitting / receiving device, a radio signal including an ID code is transmitted by a key-side radio transmitter provided on a key, and the radio signal is transmitted by a vehicle-side radio receiver provided on the vehicle. Some remote key systems have a remote key system that receives and controls the vehicle-side load when the ID code matches a preset ID code.

In this device, the key-side radio wave transmitter is provided with a primary battery as a power source, and this primary battery can be replaced so that it can be replaced when it is exhausted. However, the exchange was troublesome. In addition, the key is provided with a lid for battery replacement, but there is a risk that water may enter due to loosening of the screw for fixing the lid.

As a countermeasure against this, the applicant has provided an electromagnetically coupled transmitter for transmitting a power signal from an antenna coil disposed in a key cylinder lock portion to a vehicle based on the fact that the key has been mounted, A secondary battery is provided as a power source for the key-side radio transmitter, and an electromagnetic coupling coil for receiving a power signal from the electromagnetic coupling type transmitter by electromagnetic coupling is provided, and the power received by the electromagnetic coupling coil is provided. It is considered to provide a charging device that generates operating power in accordance with a signal to charge the secondary battery.

According to this, it is not necessary to replace the battery, and it is easy to prevent water from entering. However, on the other hand, when communication is performed between the antenna coil of the electromagnetic coupling type transmitter on the vehicle side and the electromagnetic coupling coil on the key side, since the communication is performed by the electromagnetic coupling as described above, the key is not connected to another key. When provided on the key holder together with the key, the passage of magnetic flux from the antenna coil of the electromagnetic coupling type transmitter on the vehicle side to the electromagnetic coupling antenna of the key side transmitter / receiver is hindered by the above-mentioned other keys, and the Performance may deteriorate.

A second object of the present invention is to provide a remote key system that does not require battery replacement, facilitates prevention of water intrusion, and further improves communication performance. To offer.

[0011]

According to a first aspect of the present invention, an antenna coil is provided in a key cylinder lock portion of a vehicle, and an electric power signal is generated based on the mounting of the key. An electromagnetic coupling transmitter for transmitting a transmission signal obtained by superimposing pulse data on the antenna coil from the antenna coil; and an electromagnetic coupling coil provided on the key and receiving a power signal from the electromagnetic coupling transmitter by electromagnetic coupling. A transponder that generates operating power in response to the reception of the power signal and returns a response signal in response to the pulse data; and a magnetic member provided in the key rotor so as to be located between the antenna coil and the electromagnetic coupling coil. And a body.

In this configuration, since the magnetic material is provided on the key rotor so as to be located between the antenna coil and the electromagnetic coupling coil, a magnetic path is formed between the antenna coil and the electromagnetic coupling coil, The transmission signal (magnetic field signal) transmitted from the antenna coil of the electromagnetic coupling type transmitter on the vehicle side is supplied to the electromagnetic coupling coil through the magnetic material. Therefore, communication performance is improved.

According to a second aspect of the present invention, a key-side radio transmitter provided on a key is used to transmit an ID.
A remote key system that transmits a radio signal including a code, receives a radio signal with a vehicle-side radio receiver provided in a vehicle, and controls a vehicle-side load when the ID code matches a preset ID code. In the vehicle transmitting and receiving device having an electromagnetically coupled transmitter for transmitting a power signal from an antenna coil disposed in a key cylinder lock portion based on the mounting of a key on the vehicle, wherein the key has a key side A secondary battery is provided as a power source of the radio wave transmitter, and an electromagnetic coupling coil for receiving a power signal from the electromagnetic coupling type transmitter by electromagnetic coupling is provided, and a power signal received by the electromagnetic coupling coil is provided. A charging device that generates operating power in accordance with the charging device to charge the secondary battery, so that the key rotor is located between the antenna coil and the electromagnetic coupling coil. It has a configuration in which a sex body.

In this configuration, when the key is mounted, the electromagnetic coupling type transmitter transmits a power signal from the antenna coil, the electromagnetic coupling coil receives the power signal, and the charging device operates according to the power signal. Create a power source to charge the secondary battery. Therefore, a primary battery as in the related art is not required, battery replacement is not required, and the secondary battery can be charged wirelessly. Therefore, there is no need to provide a replacement lid, and water intrusion can be easily prevented.

Further, since the magnetic body is provided on the key rotor so as to be located between the antenna coil and the electromagnetic coupling coil, a magnetic path is formed between the antenna coil and the electromagnetic coupling coil, and the vehicle is provided with a magnetic path. The power signal (magnetic field signal) transmitted from the antenna coil of the electromagnetic coupling type transmitter is supplied to the electromagnetic coupling coil through the magnetic material. Therefore, communication performance is improved.

A third aspect of the present invention is characterized in that the end of the magnetic body on the side of the coil for electromagnetic coupling faces the coil axis. In this configuration, the power signal output from the end of the magnetic body on the side of the electromagnetic coupling coil is effectively linked to the electromagnetic coupling coil, and the communication performance is further improved.

The invention of claim 4 is characterized in that the end of the magnetic material on the side of the antenna coil faces the inside of the coil. In this configuration, the power signal transmitted from the antenna coil passes through the end of the magnetic body on the antenna coil side without leakage magnetic flux,
Communication performance is further improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. First, as shown in FIG. 3, a vehicle 1 is provided with an electromagnetic coupling type transmitter 2 and a vehicle-side radio wave receiver 3. The key grip 4a of the key 4 is provided with a transponder 5 for communicating with the electromagnetically coupled transmitter 2 and a key-side radio transmitter 6 for communicating with the vehicle-side radio receiver 3.

As shown in FIG. 4, the electromagnetically coupled transmitter 2
Are a control circuit 7 mainly composed of a microcomputer, a power amplifier 8, a resonance circuit section 9, a detection circuit 10, an amplifier 1
1, the resonance circuit section 9 has an antenna coil 9a and a resonance capacitor 9b. A control program is stored in a control circuit 7 of the vehicle-side control device 1.
The control circuit 7 includes a power amplifier 8 based on a control program.
By turning on and off, as shown in FIG.
For example, a transmission signal in which a data pulse is superimposed on a power signal (magnetic field signal) having a frequency of about 125 kHz is transmitted from the antenna coil 9a. Further, an engine start ECU 12 is connected to the control circuit 7.

The transponder 5 includes a coil 1 for electromagnetic coupling.
3a and resonance capacitor 13b, transponder resonance circuit unit 13, power supply circuit 14, detection circuit 1
5. a control circuit 16 mainly composed of a microcomputer;
For example, a nonvolatile memory 17 composed of an EEPROM, CR
It comprises an oscillation circuit 18 and a modulation circuit 19.

Now, the above-mentioned key 4 is inserted into the ignition key rotor on the vehicle 1 side, and the antenna coil 9a of the electromagnetically coupled transmitter 2 on the vehicle 1 side and the electromagnetic coupling coil 13a on the key 4 side are electromagnetically coupled. Vehicle 1
The transmission signal from the antenna coil 9a on the side is provided to the electromagnetic coupling coil 13a on the key 4 side in a non-contact manner.

In the transponder 5 on the key 4 side,
The transmission signal is received by the transponder resonance circuit unit 13. This received signal is the same as in FIG. In this case, AC power is supplied by the power signal. That is, this AC power is supplied to the power supply circuit 14.
Rectified and sufficiently smoothed and made constant voltage, and the constant voltage power supply is supplied to each circuit. The detection circuit 15 shapes the resonance waveform, which is the reception signal of the transponder resonance circuit section 13, with a time constant smaller than that of the power supply circuit 14, and outputs a pulse data waveform.

The control circuit 16 of the transponder 5
Among these pulse data, SOM (Start of Message)
When the input is detected, data reading is started, and thereafter, the contents of the command are determined. Then, based on the determination result, data such as an ID code is read out from the nonvolatile memory 17 and returned to the electromagnetically coupled transmitter 2 or data is written into the nonvolatile memory 17. When the ID code is returned from the transponder 5, the electromagnetic coupling transmitter 2 determines whether or not the ID code matches the ID code preset in the electromagnetic coupling transmitter 2. In response, an engine start permission signal is output.

Although not shown, the key grip 4a is provided with an unlock operation button and a lock operation button, and the key-side radio wave transmitter 6 is operated with the operation buttons (usually operated at a position outside the vehicle). ) And the transmitting antenna 6a
6, a start signal and a data signal (an ID code signal, an unlock signal, a lock signal, etc.) are transmitted by intermittently outputting a radio signal of about 300 MHz with a predetermined time width as shown in FIG. .

The vehicle-side radio receiver 3 receives the transmission signal from the key-side radio transmitter 6 through the antenna 3a and determines whether or not the signal matches an ID code preset in the vehicle-side radio receiver 3. The door lock mechanism 2
For 0, a lock release signal or a lock signal is output.

The key-side radio transmitter 6 is provided with a secondary battery 21 made of, for example, lithium vanadium as a power source, and a charging device 22 is connected to the secondary battery 21. . The charging device 22 includes a resonance circuit unit 23 including an electromagnetic coupling coil 23a and a resonance capacitor 23b. The secondary battery 21 and the charging device 22 are integrally molded with a resin constituting the key grip 4a. The electromagnetic coupling coil 13a of the transponder 5 and the electromagnetic coupling coil 23a of the key-side radio wave transmitter 6 are arranged in a direction perpendicular to the insertion direction of the key 4, as shown in FIG.

As shown in FIG. 1, a resin fixture 25 is attached to a stationary part of the ignition key cylinder lock 24 of the vehicle 1, and the fixture 25 is located around a key rotor 24a. As described above, the annular antenna coil 9a of the electromagnetic coupling type transmitter 2 is molded. The key rotor 24a is made of resin, and is integrally formed with extending pieces 26 and 27 so as to extend to positions facing both sides of the key grip 4a. As can be seen from FIG. 2, the thickness of the extension pieces 26 and 27 is set to be substantially the same as that of the key grip 4a.

A magnetic body 28 made of, for example, ferrite is integrally molded with the extension piece 26. The magnetic body 28 is provided between the antenna coil 9a of the electromagnetic coupling type transmitter 2 and the electromagnetic coupling coil 13a of the transponder 5 and faces the inside of the antenna coil 9a. That is, it is located inside the coil diameter Dc. Further, an end 28a of the magnetic body 28 on the side of the electromagnetic coupling coil 13a is bent so as to face the coil axis.

A magnetic body 29 made of, for example, ferrite is integrally molded on the extension piece 27. The magnetic material 29 is provided in the antenna coil 9 of the electromagnetic coupling type transmitter 2.
a and the electromagnetic coupling coil 23a of the key-side radio transmitter 6 and is located inside the coil of the antenna coil 9a. Further, an end portion 29a of the magnetic body 29 on the side of the electromagnetic coupling coil 23a.
Is bent so as to face the coil axis.

In the above configuration, when the key 4 is inserted into the cylinder lock 24, the key 4 is detected by detecting means (not shown), and the transmission signal described above is output from the antenna coil 9a of the electromagnetically coupled transmitter 2. Is done. In this case, the magnetic bodies 28 and 29 are respectively connected to the antenna coil 9.
a and the electromagnetic coupling coils 13a and 23a, a magnetic path is formed between the antenna coil 9a and the electromagnetic coupling coils 13a and 23a.

Accordingly, the transmission signal (magnetic field signal) transmitted from the antenna coil 9a is supplied to the electromagnetic coupling coil 13a through the magnetic material 28 and supplied to the electromagnetic coupling coil 23a through the magnetic material 29. Will be done.
The transponder 5 receives the transmission signal and performs the above-described predetermined operation (reply of the ID code and storage of the data). In this case, since the leakage of the magnetic flux is reduced, the communication performance between the antenna coil 9a and the electromagnetic coupling coil 13a is improved. In particular, since ferrite is used for the magnetic bodies 28 and 29, the magnetic resistance is small and the communication performance is further improved.

The transmission signal (magnetic field signal) transmitted from the antenna coil 9a is also supplied to the electromagnetic coupling coil 23a through the magnetic body 29, and the charging device 22 operates according to the power signal of the transmission signal. Generating electric power and secondary battery 2
Charge 1. Also in this case, since the provision of the magnetic body 29 reduces the leakage of the magnetic flux, the antenna coil 9a
Communication performance between the coil 23a and the electromagnetic coupling coil 23a is improved,
The charging efficiency is improved. Moreover, in the present embodiment, a primary battery as in the prior art is not required, battery replacement is not required, and the secondary battery 21 can be charged wirelessly. Thus, resin molding of the secondary battery 21 and the charging device 22 becomes possible,
Water intrusion can be easily prevented.

The extension pieces 26, 2 are attached to the key rotor 4a.
7 are provided, and magnetic members 28, 29 are attached to the extension pieces 26, 27.
When the key 4 is rotated, the extended pieces 26 and 27 are also rotated.
When a is rotated to any position such as "ACC" or "ON", the magnetic members 28 and 29, the electromagnetic coupling coil 13a of the transponder 5, and the electromagnetic coupling coil 23a of the key-side radio wave transmitter 6 Is invariable, and the above-mentioned communication is always performed satisfactorily, which is particularly suitable when communication for charging requires a certain amount of time.

In particular, according to the present embodiment, since the transmission signal of the electromagnetic coupling type transmitter 2 for communication with the transponder 5 is used as the charging power of the secondary battery 21, the structure is simplified. However, a dedicated electromagnetic coupling type transmitter may be provided as charging power for the secondary battery 21.

Further, according to the present embodiment, the magnetic material 2
The ends 28a and 29a on the side of the electromagnetic coupling coils 13a and 23a of the electromagnetic coupling coils 13a and 23a
a, the power signals output from the ends 28a, 29a of the magnetic bodies 28, 29 are effectively linked to the electromagnetic coupling coils 13a, 23a, and the communication performance is improved. Is even better.

According to this embodiment, the magnetic members 28, 2
Since the antenna 9 faces the inside of the antenna coil 9a, the power signal transmitted from the antenna coil 9a passes through the magnetic bodies 28 and 29 without magnetic flux leakage, thereby further improving the communication performance. Get better. In this case, it is sufficient that at least the ends 28b and 29b (see FIG. 1) on the antenna coil 9a side face the inside of the antenna coil 9a instead of the entire magnetic bodies 28 and 29. Further, since the magnetic bodies 28 and 29 are contained in the extension pieces 26 and 27, the strength is high and the durability is good.

FIG. 7 shows a second embodiment of the present invention, which differs from the first embodiment in the following points. That is, each of the extension pieces 26 and 27 has a magnetic body 31 and a magnetic body 31 so as to be located between the antenna coil 9a of the electromagnetic coupling type transmitter 2 and the electromagnetic coupling coil 23a of the key-side radio wave transmitter 6. 32 are provided. In the case of this embodiment, the communication performance and the charging efficiency between the antenna coil 9a of the electromagnetic coupling type transmitter 2, the key side radio wave transmitter 6, and the electromagnetic coupling coil 23a are further improved. In this case, the transponder 5
And the arrangement of the electromagnetic coupling coil 13a has been changed,
That is, since the coil axis of the electromagnetic coupling coil 13a is set in the same direction as the coil axis of the antenna coil 9a, a decrease in communication efficiency is small.

FIG. 8 shows a third embodiment of the present invention, which differs from the first embodiment in the following points. That is, the magnetic member 41 is provided only in the extending piece portion 27 of the extending piece portions 26 and 27, and the magnetic material 41 is provided with the antenna coil 9 a of the electromagnetic coupling type transmitter 2 and the key side radio wave transmitter 6. Is provided so as to be located between the electromagnetic coupling coil 23a and the coil 23a.
In the case of this embodiment, the same effect as that of the first embodiment is obtained with respect to the communication performance of the antenna coil 9a of the electromagnetic coupling type transmitter 2, the key side radio wave transmitter 6, and the electromagnetic coupling coil 23a, and furthermore, the charging efficiency. Can be obtained. Also in this case, the transponder 5 and the electromagnetic coupling coil 13a
Is changed, that is, the electromagnetic coupling coil 13
Since the coil axis of “a” is set in the same direction as the coil axis of the antenna coil 9a, the decrease in communication efficiency is small.

FIG. 9 shows a fourth embodiment of the present invention, which differs from the first embodiment in the following points. That is, in the fourth embodiment, the key 4 is provided with only the transponder 5, and the extension piece 26 is provided with the magnetic material 28.
, And the extension piece 27 does not have a magnetic body. In the case of this configuration, the communication performance between the electromagnetically coupled transmitter 2 and the transponder 5 is improved.

[0040]

As apparent from the above description, the present invention has the following effects. According to the first aspect of the present invention, there is provided an apparatus for performing communication by electromagnetic coupling including an electromagnetic coupling type transmitter provided on a vehicle and a transponder provided on a key side, wherein a magnetic substance is electromagnetically coupled to an antenna coil to a key rotor. The communication performance can be improved because it is provided so as to be located between the communication coil. According to the second aspect of the present invention, it is not necessary to replace the battery in the remote key system, it is easy to prevent water from entering, and it is possible to improve the communication performance and further improve the charging efficiency.

According to the third aspect of the present invention, since the end of the magnetic body on the side of the coil for electromagnetic coupling faces the coil axis, the communication performance is further improved. According to the fourth aspect of the present invention, since the end of the magnetic material on the side of the antenna coil faces the inside of the coil, the communication performance is further improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a first embodiment of the present invention in a key mounted state.

FIG. 2 is a front view of the same.

FIG. 3 is a schematic plan view of a vehicle and a key.

FIG. 4 is a block diagram showing an electrical configuration.

FIG. 5 is a diagram showing a communication waveform.

FIG. 6 is a diagram showing another communication waveform.

FIG. 7 is a view corresponding to FIG. 1, showing a second embodiment of the present invention;

FIG. 8 is a view corresponding to FIG. 1, showing a third embodiment of the present invention.

FIG. 9 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention.

[Explanation of symbols]

1 is a vehicle, 2 is an electromagnetic coupling type transmitter, 3 is a vehicle side radio wave receiver, 4 is a key, 5 is a transponder, 9a is an antenna coil, 12 is an engine starting ECU, 13a is an electromagnetic coupling coil, and 20 is a door lock. Mechanism, 21 is a secondary battery, 22
Is a charging device, 23a is an electromagnetic coupling coil, 24 is an ignition key cylinder lock, 26 and 27 are extension pieces, 2
8, 29, 31, 32, and 41 indicate magnetic materials.

Claims (4)

[Claims] 1. An electromagnetically coupled transmitter in which an antenna coil is provided in a key cylinder lock portion of a vehicle and a transmission signal in which pulse data is superimposed on a power signal based on the mounting of the key is transmitted from the antenna coil. And an electromagnetic coupling coil provided on the key for receiving the power signal from the electromagnetic coupling type transmitter by electromagnetic coupling, generating operating power in response to the reception of the power signal, and returning in response to pulse data. A vehicle transmitting / receiving apparatus comprising: a transponder for returning a signal; and a magnetic body provided on a key rotor between the antenna coil and the electromagnetic coupling coil. 2. A radio wave signal including an ID code is transmitted by a key radio wave transmitter provided on a key, a radio wave signal is received by a vehicle radio wave receiver provided on a vehicle, and the ID code is set in advance. A vehicle transceiver having a remote key system that controls a vehicle-side load when the ID code matches the ID code, wherein an antenna signal in which a power signal is disposed in a key cylinder lock portion based on a key mounted on the vehicle. An electromagnetic coupling type transmitter for transmitting from the electromagnetic coupling type coil, a secondary battery is provided in the key as a power source of the key side radio wave transmitter, and a power signal from the electromagnetic coupling type transmitter is received by electromagnetic coupling. And a charging device for generating operating power in accordance with the power signal received by the electromagnetic coupling coil to charge the secondary battery. A transmission / reception device for a vehicle, wherein a magnetic body is provided between the antenna coil and the coil for electromagnetic coupling. 3. The vehicle transmitting / receiving device according to claim 1, wherein an end of the magnetic body on the side of the coil for electromagnetic coupling faces the coil axis. 4. The vehicle transmitting / receiving apparatus according to claim 1, wherein an end of the magnetic material on the side of the antenna coil faces the inside of the coil.