JPH07293074A - Remote key device for car - Google Patents

Abstract

PURPOSE:To make the operation of a car possible even at the time of the use-up of the electricity of a battery, and to prevent theft by continuously connecting a mechanical key and a remote key, opening a door by the mechanical key and inserting the mechanical key into an engine key cylinder and charging the battery with electricity. CONSTITUTION:A release stem 16 used for mechanical door opening and charging is connected continuously to a portable key 10 transmitting identification codes for opening a door and starting an engine integrally. When a battery for the portable key 10 is used up, the door is opened by the release stem 16, and a capacitor for the transmitter 12 of the portable key 10 is charged with electricity through a loop antenna 20 mounted on the outer circumferential section of an engine key cylinder 17 and transmitter-receiver coil 21 from a transmitter 21d, a transmitter 21e and switching transistors 21f-21h when the release stem 16 is inserted into the engine key cylinder 17. The identification codes of engine locking-release are transmitted by the voltage of a transmitter 12, and the engine key cylinder 18 is operated through the engine key cylinder 17 by the release stem 16 of the portable key 10, thus starting the engine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to remote unlocking of vehicle door locks and onboard unlocking of engine locks.

[0002]

2. Description of the Related Art A door on a vehicle is equipped with a lock / unlock mechanism, and a key for operating an engine key switch is provided in the vicinity of a steering wheel on the vehicle.
It has a cylinder. By inserting the mechanical key of the vehicle into the key cylinder of the door and turning it, the door is unlocked, and by inserting the mechanical key into the engine key cylinder and turning it, the electric current on the vehicle is turned on. And can start the engine.

To prevent theft of vehicles, recent vehicles have
A portable key provided with a wireless transmitter for transmitting an identification code (encryption code) is prepared. On the vehicle, the radio wave of the wireless transmitter is received by the antenna on the vehicle, and the received identification code is received. There is a receiver and a controller that unlock the door and / or the engine key switch when the code matches a pre-registered code. If both the protection system and the mechanical key are unlocked (released by logical sum), another person can get on the vehicle and start the engine if the mechanical key or a copy thereof is available. The significance of the protection system is low. Therefore, it is necessary to perform lock release (release by logical product) in which the release by the mechanical key becomes effective after the release processing is performed by the protection system. Alternatively, it must be possible to unlock (unlock) only by a portable key equipped with a wireless transmitter.

[0004]

However, if unlocking by logical product is set or unlocking is enabled only by a portable key equipped with a wireless transmitter, the battery of the portable key will be exhausted and effective. If the electric wave cannot be transmitted, the door lock or the engine key switch lock cannot be unlocked. Hereinafter, a portable key equipped with a wireless transmitter will be simply referred to as a “portable key”, and will be referred to as a mechanical key.
It is also carried, but this is expressed as a mechanical key.

The present invention, even when the battery of the portable key is exhausted,
Enables vehicle operation by a person who owns both a mobile key and a mechanical key at the same time, and the vehicle is stolen (runaway escape)
Is intended to prevent.

[0006]

In the present invention, the door lock can be unlocked by both a mechanical key and a portable key, and the engine key switch can be unlocked by the portable key. Not be done. In this case, the mobile key
When the battery in the battery is exhausted, the driver can ride but cannot run. In order to improve this, in the present invention, electric power is supplied from the vehicle to the portable key, and the portable key also transmits the identification code by this electric power. As a result, even when the battery of the portable key is exhausted, the lock of the engine key switch is unlocked, and the driver can drive the vehicle. Those who do not own a portable key cannot unlock the engine key switch, so even if they can get into the vehicle, they cannot drive the vehicle.

That is, the vehicle remote key device of the present invention is the first demodulation means (21a-21c) for demodulating the communication signal from the reception signal of the vehicle antenna (19); the first demodulation means (21a-21c).
The code represented by the communication signal demodulated by is the on-vehicle memory (24).
If it matches with the identification code stored in the vehicle, the door unlock instruction means (24) for instructing the door lock controller on the vehicle to unlock the door; the engine key switch on the vehicle ( 18) A first transmitting / receiving coil (20) arranged near the key cylinder (17); a first transmitting / receiving coil (20)
A power transmission means (21d to 21h) on the vehicle for passing a current of a predetermined frequency (96 KHz) on the vehicle; a switch contact (I) of the engine key switch (18) which is closed by rotation of the key cylinder (17).
Power transmission control means (24) for supplying a current of a predetermined frequency (96 KHz) to the first transmission / reception coil (20) via the power transmission means (21d to 21h) in response to the closing of (G); Second demodulation means (21i, 21c) for demodulating a communication signal from the received signal of 20); second
It is determined whether the code represented by the communication signal demodulated by the demodulation means (21i, 21c) matches the identification code stored in the on-vehicle memory (24), and if they match, the EFI controller on the vehicle is notified. EFI unlock instruction means (24) for giving information for permitting fuel injection; and an unlocking stem (16), a remote antenna (15), and an identification inserted into a key hole of the key cylinder (17). A memory (12b) storing a code, a battery (13), a power switch (14), and a communication signal representing an identification code by being connected to the battery (13) through the power switch (14). First modulating means for generating a signal and transmitting it via a remote antenna (15)
(12d, 12e), a second transmitting / receiving coil (11) that can be electromagnetically coupled to the first transmitting / receiving coil (20), a second transmitting / receiving coil (1
A DC circuit (12g) including a rectifier and a capacitor that rectifies and stores the received current of 1), and operates with the voltage of the DC circuit (12g) and modulates the second transmission / reception coil (11) with an identification code. A portable key (10) including second modulating means (12a, 12i) for transmitting the communication signal.

In order to facilitate understanding, the symbols of the corresponding elements of the embodiment shown in the drawings and described later are given in parentheses.
I filled it in for reference.

[0009]

[Operation] Power switch (14) on the portable key (10) outside the vehicle
When closed, the first modulation means (12d, 12e) generates a communication signal representing the identification code and transmits it via the remote antenna (15). When this radio wave reaches the on-vehicle antenna, the first demodulation means (21a to 21c) on the vehicle demodulates the communication signal from the reception signal of the on-vehicle antenna (19), and the door unlock instruction means (24) , It is determined whether the code represented by the demodulated communication signal matches the identification code stored in the vehicle memory (24).
Instruct La to unlock the door. This unlocks the door so that the owner of the portable key (10) can get on the vehicle.

Next, when the portable key (10) is inserted into the key cylinder (17) of the engine key switch (18) and rotated,
This allows the engine key switch (18) switch contact (I
(G) is closed, the power transmission control means (24)
A current having a predetermined frequency (96 KHz) is applied to the first transmitting / receiving coil (20) via (21d to 21h). With this energization, the portable key
A voltage is induced in the second transmitting / receiving coil (11) of (10), which causes a current to flow in the DC circuit (12g), and the capacitor of the circuit (12g) is charged. When this charging voltage reaches a predetermined value, the second modulation means (12a, 12i) causes the identification code of the memory (12b) to be detected.
The communication signal modulated by the transmitter is sent to the second transmitting / receiving coil (11). This communication signal is received by the first transmitting / receiving coil (20), the second demodulating means (21i, 21c) demodulates the communication signal from this received signal, and the EFI unlock instruction means (24) demodulated communication. It is determined whether the code represented by the signal matches the identification code stored in the on-vehicle memory (24).
Information is provided to the EFI controller on the vehicle to allow fuel injection. This allows the portable key (10) to move to the key cylinder (1
When 7) is turned to the engine start position,
Is driven, the EFI controller supplies fuel to the engine on the vehicle, and the engine is started.

In this way, the power transmission means (2
1d to 21h) through the first transmission / reception coil (20) and the second transmission / reception coil (11) to the DC circuit (12) of the portable key (10).
The capacitor of g) is charged, and the identification code for unlocking the engine is sent from the portable key (10) by the charging voltage, so the battery (13) of the portable key (10) is exhausted. However, the engine lock is released, and the unlock key (16) of the portable key (10) operates the engine key switch via the key cylinder (17) to start the engine. Since the door lock cannot be released by the portable key (10) when the battery (13) is exhausted, the vehicle equipped with the remote key device of the present invention is not suitable for the engine key cylinder. However, it is preferable that the key (mechanical key) and the portable key (10) that can mechanically unlock the door are provided as one set. By doing this, the portable key (10)
As long as the battery (13) is healthy, it alone can unlock the door and unlock the engine. When the battery (13) is exhausted and the door lock cannot be released, the door lock is released by the mechanical key and the engine lock is released by the portable key (10). The mechanical key cannot be fitted to the engine key cylinder, so even if a duplicate of it is made, the vehicle will not be taken away (run) by itself. Mechanical key
Although it is easy to copy, the mobile key (10) is difficult to copy except for its manufacturer, so unless the mobile key (10) is stolen, the vehicle may be stolen (runaway escape). Low.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the equipment on a vehicle according to one embodiment of the present invention. A loop antenna 20 (first transmitting / receiving coil) is arranged at an outer peripheral position of the engine key cylinder 17 on the vehicle so as to circulate the engine key cylinder 17. An engine key switch 18 is mechanically connected to the key cylinder 17.
The ignition switch contact IG of the switch 18 is closed (turned on) to the CPU 2 via the input / output interface 23.
4 monitors. An FSK receiver (21i, 21c; second demodulation means) is connected to the loop antenna 20, and a transmitter (21d to 21h; power transmission means) is connected to the loop antenna 20.
Transmission (power transmission) by the transmitters (21d to 21h) and signal (identification code) reception by the FSK receivers (21i, 21c) are performed via the input / output interface 23.
It is controlled by the PU 24. 96 transmitters (21d-21h)
A current for power transmission of KHz is applied to the loop antenna 20. The signal received by the antenna 19 on the vehicle is amplified by the amplifier 21a included in the first demodulation means, demodulated by the FM demodulator, and is indicated by "1" or "0" by the FSK demodulator 21c.
It is demodulated into a value signal and given to the CPU 24 via the input / output interface 23. When the sequence of the binary signals matches the identification code stored in the CPU 24, the CPU 24 sends an unlock instruction to the door lock controller via the input / output interface 23. Rule
The received signal of the antenna 20 is amplified by the amplifier 21i and demodulated by the FSK demodulator 21c. That is, the FSK modulator 21c generates a binary signal of "1" when the received signal is 96 KHz and a binary signal of "0" when the received signal is 85 KHz, and supplies this to the CPU 24. When the sequence of the binary signals matches the identification code stored in the CPU 24, the CPU 24 sends an instruction to release the EFI prohibition to the EFI controller via the input / output interface 23. To do.

When the door lock controller receives the unlock instruction from the CPU 24, the door lock controller unlocks the driver seat door. This allows the door to be opened.
The EFI controller controls the amount of fuel supplied to the engine on the vehicle, and upon receiving an instruction to release the EFI prohibition from the CPU 24, the EFI prohibition flag (prohibition information).
Is cleared and the fuel supply to the engine is set when the ignition switch contact IG is closed, so fuel is injected when the engine rotates. While the EFI prohibition flag is present, the EFI controller sets the fuel supply system to the engine to the cutoff state, and even if the engine rotates, fuel injection does not occur in the engine and the engine does not start. In addition,
In each part of the electric circuit shown in FIG.
Even if the engine key switch is off, the required voltage is always applied by the backup power supply circuit (not shown).

FIG. 3 shows the external appearance of the portable key 10, and FIG. 4 shows the structure of the internal oscillator. The portable key 10 includes a transmitter / receiver coil 11 (second transmitter / receiver coil) in which an electric coil is wound around a strip-shaped ferrite plate, a transmitter 12 connected to the transmitter / receiver coil, and a transmitter antenna (remote controller) connected thereto. Antenna 15), and the leg protruding from the main body is used as a stem 16 for mechanical unlocking. The operation button of the power switch 14 of the transmitter 12 is exposed on the flat surface of the main body. is doing. When the power switch 14 is closed, the switch contact piece 12c is switched to the FM modulator 12c side in conjunction with it. In this state, the voltage of the battery 13 is fed through the power switch 14 to the FSK modulators 12a, I
D memory 12b, FM modulator 12d and amplifier 12e
In addition, the FSK modulator 12a sequentially reads out each bit of the identification code of the ID memory 12b and outputs 96 KHz when the bit information is "1" and 85 when the bit information is "0".
An AC signal of KHz is sent to the FM modulator 12d via the switch contact piece 12c. At the beginning and the end of this transmission, the AC signals (leading edge bit signal, trailing edge bit signal) of the above frequencies corresponding to the identification bits "1" and "0" indicating them are added, and while the power switch 14 is closed. , This transmission is repeated. The FM modulator 12d FM-modulates the carrier frequency of 300 MHz with the output signal of the FSK modulator 12a and sends it to the amplifier 12e. As a result, the remote antenna 15
As a result, 300 MHz (carrier frequency) FSK-modulated identification code information is transmitted.

When this transmitted radio wave is received by the vehicle antenna 19 shown in FIG. 1, the FM modulator 21b reproduces the AC signals of 96 KHz and 85 KHz from the received signal via the amplifier 21a, and the FSK demodulator 21c A binary signal of "1" is reproduced while an AC signal of 96 KHz is present and an AC signal of 85 KHz is reproduced, and an input / output interface is reproduced.
It is given to the CPU 24 via the memory 23. The CPU 24 extracts the bit information (identification code) between the leading bit signal and the trailing bit signal of the received binary signal. That is, the identification code is read, and if it matches the identification code stored in the CPU 24, an unlock instruction is transmitted to the door lock controller via the input / output interface 23.

Referring again to FIGS. 3 and 4. Mobile key
When the unlocking stem 16 of 10 is inserted into the key cylinder 17 (FIG. 1) and an AC voltage of 96 KHz is induced in the first transmitting / receiving coil 20, the rectifying / smoothing circuit 12g rectifies it to charge the capacitor. On the other hand, when the output voltage of the constant voltage circuit 12h rises to some extent, the FSK modulator 12a starts operating, and the FSK modulator 12a causes the ID memory 1 to operate.
Each bit of the identification code of 2b is read out in order, and an AC signal of 96 KHz when the bit information is "1" and 85 KHz when the bit information is "0" is sent to the amplifier 12i via the switch contact piece 12c. To the head and tail of this transmission, the AC signals (leading bit signal and trailing end bit signal) of the above frequencies corresponding to the identification bits "1" and "0" indicating them are added, and the output voltage of the constant voltage circuit 12h is added. This transmission is repeated for a certain level or higher. When the charging voltage of the capacitor of the rectifying / smoothing circuit 12g reaches the set value, the constant voltage circuit 12h
When a breakdown current starts to flow in the constant voltage element of, the switching circuit 12f switches and connects the transmission / reception coil 11 to the amplifier 12i side. As a result, the identification code of the ID memory 12
An AC signal of 96 KHz or 85 KHz corresponding to the current flows in the electric coil of the transmission / reception coil 11.

This is received by the loop antenna 20 of FIG. 1, and the received signal of the loop antenna 20 is amplified by the amplifier 21i and demodulated by the FSK demodulator 21c. That is, the FSK modulator 21c outputs a binary signal of "1" when the received signal is 96 KHz and a binary signal of "0" when the received signal is 85 KHz.
A value signal is generated and given to the CPU 24. CPU2
4 indicates that the CPU 24 has a series of binary signals
When it matches the identification code stored in No. 4, an instruction to release the EFI prohibition is transmitted to the EFI controller via the input / output interface 23.

FIG. 2 shows the control operation of the CPU 24 shown in FIG. When the electric circuit shown in FIG. 1 is mounted on a vehicle and an operating voltage is applied by a backup power supply circuit (not shown), the CPU 24 clears internal registers, counters, timers, etc., and waits for an input / output port. Set to the signal level of the state. After that, as long as the operating voltage is applied from the backup power supply circuit, steps 1 and 2 shown in FIG.
Process 1 is performed.

That is, the potential of the ignition key switch contact piece IG of the engine key switch 18 is checked to read the on / off state of the IG (step 1). In addition,
In the following, when a step number is written in parentheses, the word "step" is omitted. Then, information on the registers DUF and EUF and ON / OFF of the IG are checked (1, 2, 8). The information “0” in the register DUF is
The information "0" in the register EUF indicates that the door lock controller has not been instructed to unlock the door yet.
This shows a state where the EFI controller has not yet been instructed to release the EFI prohibition.

While the IG is off and the information in the register DUF is "0", the receivers (21a to 21c)
Wait for the identification code signal (binary signal) to be given (1
-2-3, 4-1). That is, the remote key of the mobile key-10
It waits for reception of the radio wave transmitted from the antenna 15. Figure 4
When the driver having the portable key 10 shown in FIG. 6 turns on the power switch 14, the radio wave carrying the signal representing the identification code of the memory 12b is transmitted from the antenna 15 while the power switch 14 is on. When this radio wave arrives and the receivers (21a to 21c) shown in FIG. 1 send an identification code signal, C
The PU 24 checks whether it matches the identification code stored in the CPU 24 itself (5). If they match, the door unlock controller is instructed to unlock the door, "1" is written in the register DUF, and the register E is registered.
Clear the UF (7). After that, while the IG is off,
Since the information in the register DUF is "1", it waits for the IG to turn on (1-2-1). Since the door lock controller unlocks the door, the portable key 10
A driver with can open the driver's seat door and sit in the driver's seat.

The driver sits in the driver's seat and the portable key 10
Insert the unlocking stem 16 of No. 1 into the key hole of the engine key cylinder 18 and, as in the case of using a normal mechanical key,
When turning to the starter position to start the engine, the IG turns on. In response to this, the CPU 24 causes the register E
The UF information is referred to, and since it is "0" at this stage, 1 is written in the transmission count register N (9), and 96 KHz AC is charged to charge the DC circuit 13 of the portable key 10. -Energize the antenna 17 (10; start energizing). Specifically, control data to the transmitter 21d is instructed to "transmit". This instruction data
1 bit of the data is given to the oscillator 21e as an ON instruction, and the oscillator 21e generates a signal of 96 KHz. In response to the transmission instruction, the transmitter 21d turns on and off the transistors 21f and 21h in synchronization with the 96 KHz signal. That is, 2 during a half cycle of 96 KHz
If 1f is on and 21h is off, it will be 21 during the next half cycle.
f is turned off and 21h is turned on. As a result, an alternating current of 96 KHz flows through the loop antenna 20. Next CP
U24 is a timer T1 (T1 timed program timer)
(11) and wait for that timeover (1
2) When the time is over, the transmission of 96 KHz is stopped (13). That is, the oscillator 21e is turned off and the transmitter 21d is turned off. As a result, the transistor 21f is turned off and the transistor 21h is turned on. Then, the CPU 24 starts the timer T2 for the T2 time limit (14).

During this T1, the loop antenna 20 is energized by 96 KHz alternating current, so that the engine key cylinder 1
AC voltage is induced in the transmission / reception coil 11 of the portable key 10 inserted into the terminal 7, thereby charging the capacitor of the rectifying / smoothing circuit (DC circuit) 12f, and the constant voltage circuit 12h.
Of the constant voltage element, and the switching current causes the switching circuit 12f to switch to the connection on the amplifier 12i side. Before the switching, when the charging voltage rises to a certain extent, the FSK modulator 12a is repeatedly activated by the charging voltage to repeatedly generate the identification code signal, which is the switch contact 12.
It is amplified through c and by the amplifier 12i. When the switching circuit 12f is switched to the connection on the amplifier 12i side, the identification code signal is amplified by the amplifier 12i and flows to the transmission / reception coil 11. Rectifying and smoothing circuit (DC circuit) 12f
The identification code signal repeatedly flows through the transmission / reception coil 11 until the capacitor voltage of the FSK modulator 12a drops to a voltage at which the FSK modulator 12a cannot operate. The amplifier 21i of FIG. 1 amplifies the signal, and the FSK demodulator 21c identifies it. Code signal (binary signal)
Is demodulated and given to the CPU 24.

Upon receipt of this identification code signal (binary signal), the CPU 24 checks whether it matches the identification code stored in the CPU 24 (15, 16).
If they match, the EFI prohibition is released.
To the register EUF, write 1 (engine unlock instruction issued) to the register EUF, and clear the register DUF (18). After this, while IG is on, step 1
Go around -8-1. That is, it waits for the IG to turn off. When the IG is turned off, the register DUF is cleared in step 18 this time, so step 1-2
It goes around 3,4-1 and waits for the identification code to arrive from the on-board antenna 19.

The above-mentioned transmission of 96 KHz for charging the DC smoothing circuit 12g of the portable key 10 is transmitted at time T1.
Continuously, and within a time T2 after stopping it,
When the identification code is not received, the timer T2 times out (19 in FIG. 2). Then, the CPU 24 checks whether the number of transmissions (data of the register N) has reached four times (20), and if it has not reached four times, increments the data of the register N by one (21 ), And the transmission of 96 KHz is performed again (10). If the proper identification code is not received even after making four calls, the CPU 24 returns to the on / off check (1) of the IG and starts over. In this state, since steps 16 to 18 have not been performed, the EFI prohibition has not been released, so the EFI controller does not supply fuel to the engine and the engine does not start.

[0026]

As described above, the first transmission / reception coil (20) and the second transmission / reception coil (20) and second transmission coil (21d-21h) are mounted on the vehicle.
DC circuit of portable key (10) via transmission / reception coil (11)
The (12g) capacitor is charged, and the identification code for unlocking the engine by the charging voltage is the portable key (10).
Even if the battery (13) of the portable key (10) is exhausted, the engine lock is released and the unlocking stem (16) of the portable key (10) causes the key cylinder (17) to be released. ), The engine key switch is operated, and the engine is started.
Since the door lock cannot be released by the portable key (10) when the battery (13) is exhausted, the vehicle equipped with the remote key device of the present invention is not suitable for the engine key cylinder. However, it is preferable that the key (mechanical key) and the portable key (10) that can mechanically unlock the door are provided as one set. By doing this, the mobile key (10)
Can unlock the door and the engine alone when the battery (13) is healthy. When the battery (13) is exhausted and the door lock cannot be released, the door lock is released by the mechanical key and the engine lock is released by the portable key (10). The mechanical key cannot be fitted to the engine key cylinder, so even if a duplicate of it is made, the vehicle will not be taken away (run) by itself. It is easy to copy the mechanical key, but it is difficult to copy the mobile key (10) except for its manufacturer, so unless the mobile key (10) is stolen, the vehicle will be stolen (runaway). Unlikely.

[Brief description of drawings]

FIG. 1 is a block diagram showing a receiver and the like mounted on a vehicle according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a control operation of the CPU 24 shown in FIG.

3 is an enlarged plan view showing the appearance of a portable key 10 mounted on the engine key cylinder 17 shown in FIG.

4 is a block diagram showing an electric circuit of the portable key 10 shown in FIG.

[Explanation of symbols]

10: Portable Key 11: Transmission / Reception Coil 12: Oscillator 12a: FSK Modulator 12b: ID Memory 12c: Switch Contact 12d: FM Modulator 12e: Amplifier 12f: Switching Circuit 12g: Rectifying and Smoothing Circuit 12h: Constant Voltage Circuit 13 : Battery 14: Power switch 15: Remote antenna 16: Unlocking stem 17: Engine key cylinder 18: Engine key switch 19: Vehicle antenna 20: Loop antenna 21a: Amplifier 21b: FM demodulator 21c: FSK Demodulator 21d: Transmitter 21f-21h: Switching transistor 21i: Amplifier 22: Remote controller 23: Input / output interface 24: CPU

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location H04Q 9/00 301 B (72) Inventor Naofumi Fujie 2-chome, Asahi-cho, Kariya city, Aichi prefecture Aisin Seiki Co., Ltd. (72) Inventor Koji Aoki 2-1-1 Asahi-cho, Kariya Aichi Prefecture Aisin Seiki Co., Ltd. (72) In-house Tsuneo Hitoda 2-1-1 Asahi-cho, Kariya, Aichi Aisin Seiki Co., Ltd.

Claims (1)

[Claims] 1. A first demodulating means for demodulating a communication signal from a signal received by an on-vehicle antenna; an identification code in which a code represented by the communication signal demodulated by the first demodulating means is stored in an on-vehicle memory.
If it matches, the door unlock instruction means for instructing the door lock controller on the vehicle to unlock the door; the door unlocking means arranged near the key cylinder of the engine key switch on the vehicle. 1 transmission / reception coil; power transmission means on the vehicle for supplying a current having a predetermined frequency to the first transmission / reception coil; power transmission means in response to closing of a switch contact of the engine key switch which is closed by rotation of a key cylinder Power transmission control means for supplying a current having a predetermined frequency to the first transmission / reception coil via; second demodulation means for demodulating a communication signal from a reception signal of the first transmission / reception coil; and a communication signal demodulated by the second demodulation means. It is determined whether the code matches the identification code stored in the on-vehicle memory, and if the code matches, the EFI controller which gives the information for permitting fuel injection to the EFI controller on the vehicle is determined. Click instruction means; and the key - unlocking stem to be inserted into the hole, remote - - key cylinder bets antennas, identifying co - memory storing de, battery,
A power switch; first modulating means for generating a communication signal representing an identification code by connecting to the battery through the power switch and transmitting the communication signal through a remote antenna;
A second transmission / reception coil that can be electromagnetically coupled to the transmission / reception coil, a DC circuit that includes a rectifier and a capacitor that rectifies and stores the received current of the second transmission / reception coil, and a second DC circuit that operates with the voltage of the DC circuit. Identification coil on the transmitter / receiver coil
A remote key device for a vehicle, comprising a portable key including a second modulating means for transmitting a communication signal modulated by a terminal.