JPH11125044A - Keycard and keyless entry system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To considerably improve the convenience in using a system by locking or unlocking the door of a motor vehicle only by coming close to or going far from the motor vehicle while a person is carrying an IC card but without operating the IC card thereby reducing the power consumption in the IC card. SOLUTION: When an IC card 4 is held in the hand and raised, it is detected by a permanent magnet, a detection coil and a portable detection signal creating circuit, an FM signal is transmitted from the side of the IC card 4, the FM signal is received by a vehicle side device 3, a door 5 of the motor vehicle 2 is locked or unlocked. And by coming closer to the motor vehicle 2, communication by FM signal can be forcefully stopped when the communication by the electromagnetic induction method becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key card and a keyless entry system for locking and unlocking a door provided on a vehicle by a non-contact method, and for locking and unlocking a steering wheel.

[0002]

2. Description of the Related Art Conventionally, a keyless entry system for locking and unlocking a vehicle door without using a mechanical key in a non-contact manner has been disclosed in Japanese Unexamined Patent Publication No. 7-15083.
An “operation management system” disclosed in Japanese Patent Publication No. 5 (JP-A) No. 5 is known.

In this operation management system, as shown in FIG. 11, a low-frequency driving current is generated by a reading and collating unit 101 provided on a vehicle side, and an alternating magnetic field is output from an antenna 102. When a driver's license 103 having a non-contact key function is brought close to the door side of the vehicle by a driver, and an electromotive voltage corresponding to the alternating magnetic field is generated by a coil 104 embedded in the driver's license 103 , IC embedded in driver's license 103
The circuit 105 is activated to supply a code signal to the reading and collating unit 101 via the coil 104 which is electromagnetically coupled to the antenna 102, so that the door lock of the vehicle can be released in a non-contact manner or the engine can be turned off. Or start it.

[0004]

However, in such a conventional operation management system 100, the coil 104 embedded in the driver's license 103 and the antenna 102 provided on a vehicle door or the like are electromagnetically connected. Since the code signal output from the driver's license 103 is transmitted to the reading and collating unit 101 on the vehicle side by combining them, the communication distance becomes shorter as compared with the RKE function generally used at present. There was a problem that would.

A coil 104 embedded in a driver's license 103 and an antenna 1 provided in a vehicle door or the like are provided.
Since the electromagnetic coupling rate changes in accordance with the angle with the driver's license 02, there is a problem that the door cannot be unlocked unless the inclination of the driver's license 103 is set within a certain range with respect to the vehicle door. Was.

As a method for solving such a problem, the present inventor has previously combined the electromagnetic induction system and the FM radio system to lock the vehicle door in a non-contact manner or to lock the vehicle door. We proposed a keyless entry system to cancel (Japanese Patent Application No. 9-71843).

In this keyless entry system, in order to improve usability, when a predetermined condition is satisfied,
After the FM signal is transmitted from the key card side to lock or unlock the door on the vehicle side, the FM signal transmission on the card side is performed after a certain time using the timer function of the CPU circuit. Since the operation is stopped, once the transmission of the FM signal from the card side is started, the FM signal continues to be transmitted even after the driver gets on the vehicle and starts running. For this reason, it has been found that the system is liable to malfunction, and the battery provided on the card is quickly consumed, so that the FM wireless communication cannot be performed.

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a method of reducing the power consumption of a card, greatly reducing the power consumption of the card, and operating the card without moving the card. The key card and the keyless entry system that can lock and unlock the door of the car and greatly improve the usability while reducing the time and effort for battery replacement and charging It is intended to be.

[0009]

According to the present invention, in order to achieve the above-mentioned object, according to the present invention, a user carries a communication function by an electromagnetic induction system and a communication function by a wireless system. A key card for performing a process such as locking or unlocking a door or a steering by performing communication by an electromagnetic induction method or a wireless method with a main device, and performing a wireless communication with the main device. During communication, when the key card enters a range where communication by electromagnetic induction is possible, a cancel determination circuit that generates a cancel instruction signal to stop communication by wireless and start communication by electromagnetic induction is provided. It is characterized by having.

According to a second aspect of the present invention, in the key card according to the first aspect, the cancel determination circuit is configured to perform an electromagnetic induction communication with the main body side device while performing a wireless communication with the main body side device. In the case where a magnetic signal including a cancel signal is transmitted from the controller, a cancel instruction signal for stopping communication by a wireless communication method and starting communication by electromagnetic induction in response to reception of the cancel signal is generated. .

Further, in the present invention, a key card which is carried by a user and has a communication function using an electromagnetic induction method and a communication function using a wireless method is provided between the key card and an electromagnetic induction method or a wireless method. In a keyless entry system including a main body side device that performs processing such as locking or unlocking a door or steering by performing communication by the key card, the key card detects that the user has started carrying, While the wireless detection is being performed between the portable detection circuit that performs either the communication function using the electromagnetic induction method or the communication function using the wireless method, and the communication using the wireless method between the main body-side device, the key card communicates using the electromagnetic induction method. Is within the possible range,
A cancel determination circuit for generating a cancel instruction signal for stopping communication by the wireless method and starting communication by the electromagnetic induction method and supplying the cancel instruction signal to the portable detection circuit, wherein the main body-side device is configured such that the key card is an electromagnetic induction method. And a circuit for transmitting a magnetic signal including a cancel signal by detecting that the communication has entered the range in which the communication by the communication is possible.

[0012] According to the above configuration, when the key card enters a range in which communication by the electromagnetic induction method is possible during the communication by the wireless method, the communication by the wireless method to the key card is performed. By stopping the operation and starting the communication by the electromagnetic induction method, the power consumption on the key card side is greatly reduced, while the key card is being operated without approaching the vehicle without operating the key card, It is possible to lock or unlock the door of the vehicle just by moving away, thereby greatly improving the usability while reducing the trouble of replacing the battery and the trouble of charging.

[0013]

FIG. 1 is a schematic diagram showing an embodiment of a keyless entry system according to the present invention.

The keyless entry system 1 shown in FIG. 1 includes a vehicle-side device 3 provided on the vehicle 2 side and an IC card 4 carried by a driver, and sufficient electric power is stored on the IC card 4 side. IC if available
When the driver is out of the vehicle while carrying the card 4, the IC card 4 and the vehicle-side device 3 communicate with each other by the FM communication method to lock the door 5 of the vehicle 2,
When the IC card 4 is unlocked, or when sufficient electricity is not stored in the IC card 4 or when the IC card 4 is within the electromagnetic induction range, the electromagnetic induction method is used.
The IC card 4 and the vehicle-side device 3 communicate with each other to lock or unlock the door 5 of the vehicle 2, and the driver further transfers the IC card 4 to the vehicle as shown in FIG. When the IC card 4 is inserted into the IC card slot 65 of the steering lock device 22 provided in the vehicle 2, the IC card 4 and the vehicle-side device 3 communicate with each other by electromagnetic induction, and the steering mechanism is unlocked. , Make traveling possible.

As shown in an exploded perspective view of FIG. 3, the IC card 4 has a lower case 7 composed of a plate-like member having a frame 6 formed in a peripheral portion, and an inner side of the lower case 7 (see FIG. 3). , A magnet sliding frame 8 formed on the upper side) and a permanent magnet 9 slidably housed in the magnet sliding frame 8.
A circuit board 10 housed inside the lower case 7,
In the state where the permanent magnet 9 and the circuit board 10 are housed in the lower case 7, the frame is formed by a plate-shaped member having a frame 11 corresponding to the frame 6 formed in the lower case 7 in the peripheral portion.
An upper case 12 is provided in which the frame 11 is inserted into the frame 6 of the lower case 7 and is integrated with an adhesive, a resin, or the like.
When the permanent magnet 9 moves inside, the circuit formed on the circuit board 10 is turned on, and the vehicle 2
It communicates with the vehicle-side device 3 on the vehicle side to release the lock of the door 5 of the vehicle 2 and the like.
When the electromotive voltage is induced by the alternating magnetic field output from the knob 66 by approaching the knob 66 provided on the door 5 of the above, the circuit formed on the circuit board 10 is turned on, It communicates with the vehicle-side device 3 of the vehicle 2 by the electromagnetic induction method, forcibly cancels the communication by the FM wireless method, unlocks the door 5 of the vehicle 2, and performs other operations. When an electromotive force is induced by an alternating magnetic field that is inserted into an IC card insertion port 65 provided in the driver's seat of the vehicle 2 and is output from the back side of the IC card insertion port 65, it is formed on the circuit board 10. The circuit is turned on, and communicates with the vehicle-side device 3 of the vehicle 2 by electromagnetic induction to release the steering lock.

The circuit board 10 is a board 1 formed in a plate shape.
3, when the IC card 4 is provided on the substrate 13 and is lifted up by a driver or the like, this is detected,
Until a predetermined condition is satisfied, a portable detection circuit 14 that outputs a portable detection signal, an FM antenna 15 that is provided on the substrate 13 and transmits and receives an FM signal, and is provided on the substrate 13,
An FM modem circuit 16 that communicates with the vehicle-side device 3 by an FM wireless system via an FM antenna 15, a coil 17 that is provided on the substrate 13 and that performs transmission and reception of a magnetic signal by an electromagnetic induction system, and the like. When the magnetic signal detected by the coil 17 includes a cancel signal while generating a power supply voltage by rectifying the low frequency electromotive voltage induced in the coil 17, a cancel instruction signal is generated.
This is supplied to the portable detection circuit 14, and when an ID code signal (the ID code signal given to the IC card 4) is input, it is modulated to output a magnetic signal from the coil 17. A supply / transmit / receive circuit 18;
When the FM signal received by the FM modem circuit 16 includes a wake-up signal, the wake-up determination circuit 19 is provided on the board 13 and detects a wake-up signal. When the security control circuit 20 encrypts the stored ID code signal and supplies it to the FM modem circuit 16 and the electromagnetic induction power supply / transmission / reception circuit 18 when it is ready, it is arranged on the board 13.
A power supply circuit 21 for supplying a power supply voltage to the FM modem circuit 16 and the security control circuit 20 is provided.

When sufficient power is stored in the power supply circuit 21, the driver or the like may use the IC card 4
Is lifted or tilted, this is detected, and an FM signal including an encrypted ID code signal is transmitted to the vehicle-side device 3. Alternatively, when a magnetic signal including a cancel signal is transmitted from the vehicle-side device 3, the transmission of the FM signal including the encrypted ID code signal is stopped.
After a certain period of time has passed, the driver sets the vehicle 2
When the FM signal including the wake-up signal is transmitted from the vehicle-side device 3 by pulling the knob 66 provided on the door 5 of the vehicle, the FM signal including the encrypted ID code signal is transmitted to the vehicle-side device 3. . If sufficient power is not stored in the power supply circuit 21, the I
When the knob 66 provided on the door 5 of the vehicle 2 is pulled while the C card 4 is kept close to the door 5 of the vehicle 2, an alternating magnetic field from the door 5 generates an electromotive voltage that is a power supply voltage. Then, the encrypted ID code signal is transmitted to the door 5 in the form of a magnetic signal. Thereafter, when the driver inserts the IC card 4 into the IC card insertion slot 65 of the steering lock device 22 provided in the driver's seat, the alternating voltage from the steering lock device 22 causes the electromotive voltage to become the power supply voltage. The vehicle-side device 3 generates and encrypts the ID code signal in the form of a magnetic signal.
Send to the side.

In this case, as shown in FIG. 4, the portable detection circuit 14 includes a detection coil 23 disposed at a position corresponding to the magnet sliding frame 8 and a permanent magnet 9 moving in the magnet sliding frame 8. When the magnetic field generated by the permanent magnet 9 changes and an electromotive voltage is generated in the detection coil 23, the generation of a portable detection signal indicating that the IC card 4 has been lifted by a driver or the like is started. A mobile detection signal generation circuit 24 for stopping generation of a mobile detection signal when a cancel instruction signal is output from the power supply / transmission / reception circuit 18 or when a predetermined period of time has elapsed; The card 4 is lifted by a driver or the like from a state of being placed on a desk or the like, and the permanent magnet 9 is lifted.
Moves in the magnet sliding frame 8 and detects an electromotive voltage induced in the detection coil 23, detects this, and starts generating a mobile detection signal, and supplies the mobile detection signal to the security control circuit 20. Thereafter, when a cancel instruction signal is output from the electromagnetic induction power supply / transmission / reception circuit 18 or when a predetermined period elapses, the supply of the portable detection signal to the security control circuit 20 is stopped.

The FM modem circuit 16 includes a receiving circuit 25 for selecting a reception signal of a designated frequency from reception signals obtained by the reception operation of the FM antenna 15, and a reception signal selected by the reception circuit 25. A demodulation circuit 26 that FM-demodulates the signal to generate an FM demodulated signal; a modulation circuit 27 that takes in the encrypted ID code signal when the security control circuit 20 is output and performs FM modulation; A transmitting circuit 28 that takes in the FM-modulated signal output from the modulation circuit 27, converts the signal into a transmission signal having a preset power, and transmits the FM signal from the FM antenna 15; Among the received signals obtained by the receiving operation of the antenna 15, a received signal of a preset frequency is selected, and the received signal is obtained by FM demodulation. Supplying the FM demodulated signal to the wake-up judgment circuit 19, also the security controller 2
When an encrypted ID code signal is output from 0, the ID code signal is fetched, FM-modulated, and then power-amplified to generate a transmission signal having a specified transmission signal characteristic.
The FM signal is transmitted from the FM antenna 15.

Further, the wake-up determination circuit 20 outputs F
When the FM demodulated signal is output from the M modem circuit 16,
It is determined whether or not the wake-up signal for the own IC card is included in the FM demodulated signal. When the wake-up signal for the own IC card is included in the FM demodulated signal, a response instruction signal is generated. This is supplied to the security control circuit 20.

When a random number generation instruction is input, the security control circuit 20 uses a random number code to generate a new ID.
A random number code circuit 29 for generating a code; a memory circuit 30 for storing a new ID code and the like generated by the random number code circuit 29; a process for operating the random number code circuit 29 to generate a new ID code; A variable ID code setting circuit 31 for encrypting the ID code stored in the circuit 30 and supplying the encrypted ID code to the electromagnetic induction power supply / transmission / reception circuit 18, the FM modem circuit 16, and the like
At a predetermined timing, the random number code circuit 29 is operated to generate a new ID code, and while the ID code stored in the memory circuit 30 is updated, the mobile phone detection circuit 14 While the detection signal is being output, the ID code stored in the memory circuit 30 is encrypted and supplied to the FM modem circuit 16, and when the response instruction signal is output from the wake-up determination circuit 19, The ID code stored in the memory circuit 30 is encrypted and supplied to the FM modem circuit 16. When the power supply voltage is output from the electromagnetic induction power supply / transmission / reception circuit 18, the ID code stored in the memory circuit 30 is encrypted. The data is encrypted and supplied to the electromagnetic induction power supply / transmission / reception circuit 18.

When a low-frequency alternating magnetic field is applied to the coil 17 to induce an electromotive voltage, the electromagnetic induction power supply / transmission / reception circuit 18 rectifies and smoothes the electromotive voltage to obtain a predetermined voltage. A rectification / power supply circuit 32 that generates a power supply voltage having a value and supplies the power supply voltage to the security control circuit 20, and a magnetic signal output from the vehicle-side device 3 side is detected by the coil 17 and a preset high voltage is detected. A receiving circuit that detects when an electromotive voltage having a frequency is generated and generates a magnetic detection signal;
A demodulation circuit 71 that demodulates the magnetic detection signal output from the demodulator to generate a demodulation signal, and determines whether the demodulation signal output from the demodulation circuit 71 includes a cancel signal for the own IC card. When the demodulation signal includes a cancellation signal for the own IC card, a cancellation determination circuit 72 that generates a cancellation instruction signal and supplies it to the portable detection circuit 14, and a rectification / power supply circuit 32 supplies a power supply voltage. When an encrypted ID code signal is output from the security control circuit 20 in a state where is output, a control circuit 33 that takes in the encrypted ID code signal,
Circuit 34 frequency-modulates the encrypted ID code signal output from, and generates a high-frequency transmission signal.
And a transmission circuit 35 for generating a magnetic signal by supplying a drive current to the coil 17 based on the transmission signal output from the modulation circuit 24.

When the IC card 4 is moved closer to the door 5 of the vehicle 2 or inserted into the IC card insertion port 65 provided in the steering lock device 22, a low frequency alternating magnetic field is applied to the coil 17. When an electromotive voltage is induced, the electromotive voltage is rectified and smoothed to generate a power supply voltage having a preset voltage value, and the power supply voltage is supplied to the security control circuit 20. When a magnetic signal is output from the side, it is demodulated to determine whether a cancel signal is included, and when the magnetic signal includes a cancel signal,
A cancellation instruction signal is generated, and the cancellation instruction signal is generated.
When the encrypted ID code signal is output from the security control circuit 20, the encrypted ID code signal is taken in, and a magnetic signal including the ID code signal is generated to generate a magnetic signal including the ID code signal. It is transmitted to the insertion port 65 side.

As shown in FIG. 1, the vehicle-side device 3 is buried in a windshield of the vehicle 2 or the like, and is disposed in a door 5 of the vehicle 2 or the like, and an FM antenna 36 for transmitting and receiving FM signals. A door antenna 37 for transmitting a magnetic signal to the IC card 4 and detecting a magnetic signal from the IC card 4 while generating a low frequency alternating magnetic field.
2, a predetermined portion of the steering lock device 22 provided in the driver's seat of the vehicle 2, for example, as shown in FIG. An antenna 38 in the driver's seat that detects a magnetic signal from the card 4 and a trigger switch that is provided on the knob 66 of the door 5 and generates a trigger signal by detecting when the knob 66 is lightly pulled by a driver or the like. 39, a courtesy switch 40 for turning on / off a courtesy lamp provided in the vehicle 2, and a door lock switch 41 for detecting whether or not the door 5 of the vehicle 2 is locked.

Further, as shown in FIG. 5, the vehicle-side device 3 includes a wake-up signal transmitting circuit 42, an FM modem circuit 43, an electromagnetic induction power supply / transmission / reception circuit 44 inside the door, and a electromagnetic induction power supply / reception inside the driver's seat. It has a circuit 45, a security control circuit 46, a power supply switching circuit 47, and a control circuit 48, and is installed on the back side of an instrument panel provided in the driver's seat of the vehicle 2 to open and close the trigger switch 39 and the courtesy switch 40. A process of outputting a low-frequency alternating magnetic field from the antenna 37 in the door and the antenna 38 in the driver's seat based on the opening / closing contents, the opening / closing contents of the door lock switch 41, the opening / closing contents of the ignition switch 50, etc. For outputting a magnetic signal including the antenna 37 in the door and the antenna 3 in the driver's seat When a magnetic signal from the IC card 4 is detected, the contents of the magnetic signal are decoded to control the lock, unlock, steering lock, unlock, etc. of the door 5, a trigger signal from the trigger switch 39 Is output, the FM signal including the wake-up signal is transmitted from the FM antenna 36, the FM signal transmitted from the IC card 4 is received, the reception result is decoded, and the unlocking of the door 5 is performed. A control device 49 for performing control processing and the like.

Then, the driver or the like uses the IC card 4
When the vehicle approaches the vehicle 2 while being carried and an FM signal transmitted from the IC card 4 is received, the FM signal is decoded to lock and unlock the door 5 and to perform an antenna in the door. A magnetic signal including a cancel signal is generated while an alternating magnetic field having a low frequency is output from 37 and transmitted to the IC card 4 side. Further, when the driver pulls the knob 66 of the door 5 lightly, it detects this and causes the FM antenna 36 to transmit an FM signal including a wake-up signal. When the signal is transmitted, the FM signal is decoded to lock and unlock the door 5, and even if a certain period of time has passed since the driver pulled the knob 66 of the door 5, the IC is not changed. When the FM signal is not transmitted from the card 4, the IC card 4 is output while outputting a low-frequency alternating magnetic field from the antenna 37 in the door.
When a magnetic signal is transmitted from the controller 5, the magnetic signal is decoded, and the door 5 is locked and unlocked. Further, when the driver is in the vehicle 2, while outputting a low-frequency alternating magnetic field from the driver-side antenna 38,
When the IC card 4 is inserted into the IC card insertion slot 65 and a magnetic signal is transmitted from the IC card 4, the magnetic signal is decoded and the steering lock mechanism 22 is locked and unlocked.

In this case, as shown in FIG. 5, the wake-up signal transmitting circuit 42 constituting the control device 49
The knob 66 of the door 5 is pulled by a driver or the like,
When the trigger switch 39 is closed and a wake-up output instruction signal corresponding to the trigger signal is output from the control circuit 48 in response thereto, the wake-up signal corresponding to the specific IC card 4 registered in advance is output. And supplies it to the FM modem circuit 43.

When a wake-up signal is output from the wake-up signal transmitting circuit 42, the FM modem circuit 43 takes in the wake-up signal and performs FM modulation. The FM modem circuit 43 outputs an FM-modulated signal output from the modulation circuit 51. The transmission circuit 52 converts the signal into a transmission signal having a preset power and transmits the FM signal from the FM antenna 36, and the reception signal obtained from the reception operation of the FM antenna 36. The wake-up signal transmission circuit 42 includes a reception circuit 53 that selects a reception signal of a frequency, and a demodulation circuit 54 that FM-demodulates the reception signal selected by the reception circuit 53 to generate an FM demodulation signal. The output wake-up signal is converted into a transmission signal of the FM radio format,
When the FM signal is transmitted and the FM signal transmitted from the IC card 4 is received by the FM antenna 36, the FM signal is FM demodulated to generate an FM demodulated signal, which is supplied to the security control circuit 46. I do.

The power supply switching circuit 47 includes:
When the driver 66 pulls the knob 66 of the door 5 to close the trigger switch 39 and the control circuit 48 outputs a power supply instruction signal in response thereto,
By the switching operation, a power supply voltage having specified characteristics is generated and supplied to the electromagnetic induction power supply / transmission / reception circuit 44 inside the door and the electromagnetic induction power supply / reception circuit 45 inside the driver's seat.

Electromagnetic induction power supply / transmission / reception circuit 4 inside the door
4 generates a low-frequency alternating current when the power supply voltage is output from the power supply switching circuit 47;
When a low frequency alternating magnetic field is output from the door antenna 37 and a cancel instruction signal is output from the control circuit 48, a high frequency drive current including the cancel signal is generated, and the cancel signal is output from the door antenna 37. A transmitting circuit 55 for outputting a magnetic signal including
When a magnetic signal output from the IC card 4 side is detected by the door antenna 37 and an electromotive voltage of a preset high frequency is generated, the reception circuit 56 detects this and generates a magnetic detection signal. And a demodulation circuit 57 that demodulates the magnetic detection signal output from the reception circuit 56 to generate a demodulated signal. When a power supply voltage is output from the power supply switching circuit 47, a low frequency An alternating current is generated to output a low-frequency alternating magnetic field from the antenna 37 in the door, and the control circuit 4
8 outputs a high-frequency drive current including the cancel signal, causing the door antenna 37 to output a magnetic signal including the cancel signal. When the magnetic signal transmitted from the side is detected and a magnetic detection signal corresponding to the magnetic signal is output, the magnetic detection signal is demodulated to generate a demodulated signal, which is supplied to the security control circuit 46. I do.

When the power supply voltage is output from the power supply switching circuit 47, the driver's seat inside electromagnetic induction power supply / reception circuit 45 generates a low frequency alternating current, and the driver's seat antenna 38 provides a low frequency alternating current. When a magnetic signal output from the IC card 4 side is detected by the transmitting circuit 58 for outputting an alternating magnetic field of a frequency and the antenna 38 in the driver's seat and an electromotive voltage of a preset high frequency is generated, And a demodulation circuit 60 that demodulates the magnetic detection signal output from the reception circuit 59 to generate a demodulated signal. The power supply switching circuit 47 When a low-frequency alternating current is generated when the power supply voltage is output from the antenna 38, a low-frequency alternating magnetic field is output from the antenna 38 in the driver's seat. When the magnetic signal transmitted from the IC card 4 side is detected by the driver's seat antenna 38 and a magnetic detection signal corresponding to the magnetic signal is output, the magnetic detection signal is demodulated and the demodulated signal is demodulated. Is generated and supplied to the security control circuit 46.

The security control circuit 46 has the same ID code (regular ID code) as the ID code on the IC card 4 side.
Is stored every time a new ID code is transmitted from the IC card 4 and the memory circuit 61 in which is stored.
An ID memory code changing circuit 62 for updating an ID code stored in the memory circuit 61 and an electromagnetic induction power supply / reception circuit 45 inside the driver's seat based on a regular ID code registered in the memory circuit 61 are output. Demodulated signal,
Demodulated signal output from electromagnetic induction power supply / transmission / reception circuit 44 inside door, FM output from FM modem circuit 43
A comparison determination circuit 63 that determines whether the demodulated signal includes an encrypted ID code, whether the ID code matches a regular ID code stored in the memory circuit 61, and the like. When the demodulated signal is output from the electromagnetic induction power supply / reception circuit 45 inside the driver's seat, or when the electromagnetic induction power supply / transmission / reception circuit 44 inside the door is output.
When a demodulated signal is output from the FM modem circuit 43 or when the FM demodulated signal is output from the FM modem circuit 43, it is determined whether each of these demodulated signals and the FM demodulated signal includes an encrypted ID code. Is the memory circuit 61
In addition to determining whether or not each of the demodulated signals or the FM demodulated signals includes a proper ID code, a normal card determination signal is generated. It is supplied to the control circuit 48. Also, each demodulated signal or FM demodulated signal has a new ID.
When the ID code is included, the ID memory code change circuit 62 is operated to
Update the D code.

The control circuit 48 includes a CPU circuit for performing various processes, a ROM circuit in which a program defining the operation of the CPU circuit is stored, a RAM circuit used as a work area of the CPU circuit, and the like. Processing for controlling the power supply switching circuit 47, the wake-up signal transmission circuit 42, and the like based on the ignition signal output from the ignition switch 50 and the trigger signal output from the trigger switch 39; A process of directly controlling the circuit 44 to transmit a cancel signal from the in-door antenna 37, a result of determining the ID code output from the security control circuit 46, the opening / closing contents of the courtesy switch 40, and the opening / closing contents of the door lock switch 41 Door 5
, A process for controlling the lock mechanism provided in the driver's seat, a process for controlling the steering lock mechanism 22 provided in the driver's seat, and the like.

In this case, as shown in the table of FIG. 6, when the security control circuit 46 outputs the normal card determination signal and the door 5 is completely opened, the control circuit 48 operates the door lock actuator. Skip
If the door 5 is left as it is, and the door 5 is closed while being unlocked, the door lock actuator is operated to put the door 5 into the locked state, and the door 5 is closed and completely closed. Is locked, the door lock actuator is operated to put the door 5 into the unlocked state.

Next, the door locking operation of this embodiment will be described with reference to the flowcharts shown in FIGS.
The door unlock operation will be described.

First, when the driver is in the vehicle 2, I
When the C card 4 is picked up and the permanent magnet 9 built in the IC card 4 moves in the magnet sliding frame 8, this is detected by the portable detection circuit 14, and the generation of the portable detection signal is started, and The encrypted ID code is output from the security control circuit 20, and the FM modem circuit 1
A transmission signal in the form of an FM radio signal including an ID code is output from 6, and transmission of the FM signal from the FM antenna 15 is started.

In this state, as shown in the flowchart of FIG. 7, the driver goes out of the vehicle 2 with the IC card 4 stored in the breast pocket or the like, and receives the IC card by the FM antenna 36 of the vehicle-side device 3. When the FM signal transmitted from the card 4 is received and the FM demodulated signal is output from the FM modem circuit 43 (steps ST1 and ST2), as shown in the flowchart of FIG. Is decoded to check whether or not the encrypted ID code is included, and whether or not the ID code matches the regular ID code stored in the memory circuit 61. When the authenticated ID code is included, the control circuit 48 determines that the FM signal is an FM signal from the corresponding IC card 4. It is determined (step ST1
1).

Then, the open / close contents of the courtesy switch 40 and the open / close contents of the door lock switch 41 are checked. Based on the check result, when the door 5 of the vehicle 2 is closed and not locked (step ST13) The door lock actuator of the door lock mechanism is operated by the control circuit 48, and
Is locked (step ST14).

When the driver is out of the vehicle 2, the IC card 4 placed on a desk or the like is picked up, and the permanent magnet 9 built in the IC card 4 is moved inside the magnet sliding frame 8. Is detected by the portable detection circuit 14, the generation of the portable detection signal is started, and the encrypted ID code is output from the security control circuit 20, and the ID code is output from the FM modem circuit 16. The transmission signal of the FM wireless format is output, and the transmission of the FM signal from the FM antenna 15 is started.

In this state, the driver approaches the vehicle 2 with the IC card 4 stored in a breast pocket or the like, and the FM signal transmitted from the IC card 4 is received by the FM antenna 36 of the vehicle-side device 3. When the FM demodulation signal is output from the FM modem circuit 43 (steps ST1 and ST1).
2) Whether the FM demodulated signal is decoded by the security control circuit 46 and includes an encrypted ID code, and whether the ID code matches the regular ID code stored in the memory circuit 61 It is checked whether or not the normal I
When no D code is included (step ST11),
The control circuit 48 determines that the FM signal is not the corresponding FM signal from the IC card 4, and sounds a buzzer (not shown) for 30 seconds (step ST1).
2).

At this time, if the encrypted ID code is included in the FM demodulated signal (step ST
11) Based on the output of the security control circuit 46, the control circuit 48 controls the IC card 4 to which the FM signal corresponds.
, The contents of opening and closing of the courtesy switch 40, the contents of opening and closing of the door lock switch 41, and the like are checked.
When the door 5 is completely closed and the door is locked (step ST13), after the door lock actuator of the door lock mechanism is operated and the door 5 is unlocked (step ST15), A low-frequency driving current is output from the door-side electromagnetic induction power supply / transmission / reception circuit 44, an alternating magnetic field is output from the door antenna 37, and a cancel instruction signal is generated.
A magnetic signal including a cancel signal is output from the door antenna 37 (step ST16).

As shown in the flowchart of FIG. 9, while a low-frequency electromotive force as a power supply voltage is induced in the coil 17 on the IC card 4 side, a high-frequency electromotive voltage corresponding to the magnetic signal is induced. At this time, the magnetic signal is demodulated by the electromagnetic induction power supply / transmission / reception circuit 18 (step ST30), and it is checked whether or not the cancel signal for the own IC card is included in the magnetic signal. If the cancel signal for the IC card is not included (step ST31), this is detected by the portable detection circuit 14, and the FM antenna 15
, The transmission of the FM signal is continued (step ST33),
If the magnetic signal contains a cancel signal for the own IC card (step ST31), the portable detection circuit 14
Is detected, and the generation of the mobile detection signal is stopped (step ST32). As a result, the transmission of the FM signal from the FM antenna 15 is stopped, and the power supply circuit 2
1 wasteful power consumption is prevented.

Thereafter, as shown in the flowchart of FIG. 8, the driver does not pull the knob 66 of the door 5 within a predetermined time (for example, 30 seconds), and a trigger signal is output from the trigger switch 39. If not output (step ST17), the control circuit 48 determines that the driver has lifted the IC card 4 but is not willing to open the door 5 immediately, so that the door lock actuator is operated and the door 5 is operated. Is locked to ensure security (step ST18).

When the driver pulls the knob 66 of the door 5 and outputs a trigger signal from the trigger switch 39 within a predetermined time after the door 5 is unlocked (step ST17), the control circuit is activated. By 48
When this is detected and the door 5 is unlocked, within a predetermined period of time (for example, 60 seconds), I
It is checked whether the IC card 4 has been inserted into the C card insertion slot 65 (step ST19).

Then, within a predetermined time (for example, 60 seconds) after the door 5 is unlocked,
When the IC card 4 is inserted into the IC card insertion slot 65, this is detected by the control circuit 48, the card insertion switch is turned on, and the steering lock of the steering lock mechanism 22 is released (step ST21). ), The output of the alternating magnetic field from the in-door antenna 37 and the output of the magnetic signal including the cancel signal are stopped, and the present door lock release processing ends (step ST22).

If the IC card 4 is not inserted into the IC card insertion slot 65 even after a predetermined time (for example, 60 seconds) has elapsed since the door 5 was unlocked (step ST19). ), By the control circuit 48,
When this is detected, the output of the magnetic signal including the cancel signal is stopped while only the output of the alternating magnetic field from the antenna 37 in the door is continued (step ST20).

Further, after a fixed time has passed since the driver picked up the IC card 4 and the FM signal is no longer output from the IC card 4 or when sufficient power is supplied to the power supply circuit 21 provided in the IC card 4. When the driver pulls the knob 66 provided on the door 5 of the vehicle 2 and the trigger signal is output from the trigger switch 39 (steps ST3 and ST4) in a state in which the state has disappeared, as shown in the flowchart of FIG. Then, this is detected by the control circuit 48, and the wake-up signal transmission circuit 42 is activated, whereby the FM modem circuit 43 outputs a transmission signal of the FM wireless format including the wake-up signal,
An FM signal including a wake-up signal is transmitted from M antenna 36 (step ST40).

At this time, while sufficient electricity remains in the power supply circuit 21 provided in the IC card 4, the FM signal from the vehicle-side device 3 is received by the FM antenna 15 on the IC card 4 side. When the wake-up determination circuit 19 detects that the wake-up signal for the own IC card is included in the FM signal, the encrypted ID code is output from the security control circuit 20 and the FM modem The circuit 16 generates a transmission signal of the FM wireless format including the ID code, and transmits the FM signal including the ID code from the FM antenna 15.

[0049] Within three seconds after the FM signal including the wake-up signal is transmitted from the FM antenna 36, the FM signal transmitted from the IC card 4 by the FM antenna 36 provided in the vehicle-side device 3 is transmitted. When the FM demodulation signal is received and output from the FM modem circuit 43 (step ST41), the security control circuit 46 decodes the FM demodulation signal and checks whether or not the encrypted ID code is included. And F
If the encrypted ID code is not included in the M demodulated signal, the content of the FM signal received this time is ignored (step ST43).

Further, the vehicle-side device waits after the FM signal including the wake-up signal is transmitted from the FM antenna 36 due to, for example, insufficient power stored in the power supply circuit 21 provided in the IC card 4. 3 within three seconds by the FM antenna 36 provided in the IC card 4.
Is not received (step ST4)
1) When this is detected by the control circuit 46, a low-frequency drive current is generated from the door electromagnetic induction power supply / transmission / reception circuit 44, and an alternating magnetic field is output from the door antenna 37 (step ST42).

When an electromotive voltage corresponding to the alternating magnetic field is induced by the coil 17 of the IC card 4 approaching the door 5 by the driver, an encrypted ID code is output from the security control circuit 20. , A high frequency transmission signal including an ID code is generated by the electromagnetic induction power supply / transmission / reception circuit 18,
A magnetic signal including the D code is transmitted.

As a result, an electromotive voltage corresponding to the magnetic signal transmitted from the IC card 4 is induced by the door antenna 37 provided in the vehicle-side device 3, and the electromagnetic induction power supply / transmission / reception circuit 44 inside the door is induced. When a demodulated signal obtained by demodulating the magnetic signal is output, the security control circuit 46 decodes the demodulated signal and outputs the encrypted ID.
It is checked whether a code is included, and if the encrypted ID code is not included in the demodulated signal,
This time, the content of the received magnetic signal is ignored (step ST43).

If the FM demodulated signal output from the FM modem circuit 43 or the demodulated signal output from the electromagnetic induction power supply / transmission / reception circuit 44 inside the door includes an encrypted ID code (step S1). ST43) The security control circuit 46 stores the ID code in the memory circuit 61.
Is checked to see if it matches the normal ID code stored in the FM demodulation signal, and when the FM demodulated signal does not include the encrypted normal ID code (step ST4).
4) The control circuit 48 determines that the FM signal or the magnetic signal is not the corresponding FM signal or magnetic signal from the IC card 4, and the buzzer sounds for 30 seconds (step ST45).

At this time, if the FM demodulated signal or the encrypted ID code is included in the demodulated signal (step ST44), the FM signal is output by the control circuit 48 based on the output of the security control circuit 46. And the magnetic signal is determined to be an FM signal or a magnetic signal from the corresponding IC card 4, the open / closed contents of the courtesy switch 40, the open / closed contents of the door lock switch 41, and the like are checked. Door 5 is closed and not locked (step ST4).
6) It is determined that the vehicle is getting off, the door lock actuator of the door lock mechanism is operated, and the door 5 is locked (step ST47).

At this time, if the door 5 of the vehicle 2 is completely closed and the door is locked (step ST46), it is determined that the vehicle is on board, and the door lock actuator of the door lock mechanism is activated. Activated door 5
Is unlocked (step ST48).

Thereafter, the driver operates the knob 6 of the door 5 within a predetermined time (for example, 30 seconds).
When 6 is pulled and a trigger signal is output from the trigger switch 39, this is detected by the control circuit 48, and the present door lock release processing ends (step ST49).

If the driver does not pull the knob 66 of the door and the trigger switch 39 does not output a trigger signal within a predetermined time after the door 5 is unlocked (step ST49), the control circuit 48 Although it is determined that the driver has lifted the IC card 4 but does not intend to open the door 5 immediately, the door lock actuator is operated, the door 5 is locked, and safety is ensured (step ST50). ).

As described above, in this embodiment, I
When sufficient electricity is stored in the C card 4 side,
When the driver is out of the vehicle while carrying the IC card 4, the IC card 4 and the vehicle-side device 3 are transmitted by the FM communication method.
To lock or unlock the door 5 of the vehicle 2 or when the IC card 4 does not have sufficient electricity stored therein, or when the IC card 4
Is within the range in which electromagnetic induction can be performed, the IC card 4 and the vehicle-side device 3 communicate with each other by the electromagnetic induction method to lock or unlock the door 5 of the vehicle 2, and As shown in FIG. 2, when the driver inserts the IC card 4 into the IC card insertion slot 65 of the steering lock device 22 provided in the vehicle 2, the IC card 4 and the vehicle-side device 3 are electromagnetically induced. , The steering mechanism is unlocked and the vehicle is allowed to run, so that the user can approach or leave the vehicle 2 without operating the IC card 4 while carrying the IC card 4. By simply locking the door 5, the door 5 of the vehicle 2 can be locked or unlocked, thereby greatly improving the usability.

Further, in this embodiment, when the IC card 4 is lifted by a driver or the like, this is detected by the portable detection circuit 14 provided in the IC card 4, and the IC card 4 is encrypted by the FM antenna 15. After the transmission of the FM signal including the ID code is started, the transmission of the FM signal is performed when the magnetic signal including the cancel signal is transmitted from the vehicle-side device 3 or when a predetermined period of time elapses. Is stopped, the transmission of the FM signal can be stopped when the driver gets on the vehicle 2 even in the longest case, whereby the power supply circuit 21 provided on the IC card 4 side can be stopped. The IC card 4 is operated without operating the IC card 4 while preventing unnecessary consumption.
By simply approaching or moving away from the vehicle 2 while carrying the vehicle, the door 5 of the vehicle 2 can be locked or unlocked, and as a result, the trouble of replacing the battery and the trouble of charging can be reduced. However, the usability of the system can be dramatically improved.

In this embodiment, the IC card 4
When the vehicle approaches or moves away from the vehicle 2 while carrying the device, it is determined whether or not the FM signal or the magnetic signal transmitted from the IC card 4 includes an encrypted ID code. When the signal includes the encrypted ID code, the door 5 is locked using the output of a switch generally provided in the current vehicle 2 such as the courtesy switch 40 and the door lock switch 41. Since it is determined whether the instruction is the instruction for unlocking the door 5 or the like, the switch and the like provided in the vehicle 2 are shared, so that the usability of the system is dramatically improved while lowering the hardware construction cost. Can be done.

In the above-described embodiment, the permanent magnet 9 is slidably disposed in the magnet sliding frame 8 formed in the lower case 7, and the IC card 4 is lifted by a driver or the like. When the permanent magnet 9 moves, the portable detection circuit 1
4 is detected by the detection coil 23, but other detection methods, for example, using a mechanical accelerometer, or an electrostatic sensor that detects this when touched by a driver's finger or the like For example, when the driver lifts the IC card 4, this may be detected.

Even when such a portable detection mechanism is used, the same effect as in the above-described embodiment can be obtained by transmitting an FM signal or the like in the same processing procedure as in the above-described embodiment. .

In the above-described embodiment, as shown in the table of FIG. 6, when the security control circuit 46 outputs the regular card determination signal and the door 5 is completely opened, the door lock actuator The operation is skipped and the door 5 is left as it is. If the door 5 is closed while being unlocked, the door lock actuator is operated to put the door 5 into the locked state, and the door 5 is locked. If the door is closed and fully locked, the door lock actuator is operated to unlock the door 5, but in addition to such logic, when the driver is seated on the seat, A lock instruction or an unlock instruction is provided by adding an output of a sensor for determining whether or not there is a passenger or an output of a sensor for detecting whether or not a passenger is inside the vehicle 2. It may be determined.

By doing so, it is possible to make a more detailed determination of a lock instruction and an unlock instruction.

[0065]

As described above, according to the present invention, the power consumption of the card can be greatly reduced, and the user can approach or leave the vehicle without operating the card while carrying the card. Only by this, the door of the vehicle can be locked or unlocked, thereby greatly improving the usability while reducing the trouble of replacing the battery and the trouble of charging.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of a keyless entry system according to the present invention.

FIG. 2 is a front view showing a detailed configuration example of the steering lock device shown in FIG.

FIG. 3 is an exploded perspective view showing a detailed configuration example of the IC card shown in FIG. 1;

FIG. 4 is a block diagram showing a detailed circuit configuration example of the IC card shown in FIG. 1;

FIG. 5 is a block diagram showing a detailed circuit configuration example of the vehicle-side device shown in FIG. 1;

FIG. 6 is a logic table used when performing a lock operation and an unlock operation of the control circuit shown in FIG. 5;

FIG. 7 is a flowchart showing an example of a lock operation and an unlock operation of the keyless entry system shown in FIG. 1;

FIG. 8 is a flowchart illustrating a detailed processing example of a passive entry processing routine illustrated in FIG. 7;

FIG. 9 is a flowchart showing an operation example on the IC card side corresponding to the passive entry processing routine shown in FIG. 7;

FIG. 10 is a flowchart illustrating a detailed processing procedure example of an active entry processing routine illustrated in FIG. 7;

FIG. 11 is a block diagram showing an outline of an “operation management system” disclosed in Japanese Patent Application Laid-Open No. 7-150835.

[Explanation of symbols]

1: keyless entry system, 2: vehicle, 3: vehicle side device (main body side device), 4: IC card (key card), 5: door, 6: frame, 7: lower case, 8: magnet sliding frame , 9: permanent magnet, 10: circuit board, 11: frame, 1
2: upper case, 13: board, 14: portable detection circuit, 1
5: FM antenna, 16: FM modem circuit, 17: coil, 18: electromagnetic induction power supply / transmission / reception circuit, 19: wake-up judgment circuit, 20: security control circuit, 2
1: power supply circuit, 22: steering lock device, 23:
Detection coil, 24: portable detection signal generation circuit, 25: reception circuit, 26: demodulation circuit, 27: modulation circuit, 28: transmission circuit, 29: random number code circuit, 30: memory circuit, 31:
Variable ID code setting circuit, 32: rectification / power supply circuit, 3
3: control circuit, 34: modulation circuit, 35: transmission circuit, 3
6: FM antenna, 37: door antenna, 38: driver's seat antenna, 39: trigger switch, 40: courtesy switch, 41: door lock switch, 42: wake-up signal transmission circuit, 43: FM modem circuit, 44:
Door inside electromagnetic induction power supply / transmission / reception circuit, 45: driver inside electromagnetic induction power supply / reception circuit, 46: security control circuit, 47: power supply switching circuit, 48: control circuit, 49: control device, 50: ignition switch , 51: modulation circuit, 52: transmission circuit, 53:
Receiving circuit, 54: demodulating circuit, 55: transmitting circuit, 56: receiving circuit, 57: demodulating circuit, 58: transmitting circuit, 59: receiving circuit, 60: demodulating circuit, 61: memory circuit, 62: ID
Memory code change circuit, 63: comparison judgment circuit, 65: I
C card slot, 66: knob, 70: receiving circuit, 71:
Demodulation circuit 72: Cancel decision circuit

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI H02J 17/00 H02J 17/00 B H04B 5/02 H04B 5/02 H04Q 9/00 301 H04Q 9/00 301B

Claims (3)

[Claims] Claims: 1. A user carries a communication function using an electromagnetic induction method and a communication function using a wireless method while being carried by a user.
A key card for performing processing such as locking or unlocking of a door or a steering by performing communication by an electromagnetic induction method or a wireless method with a main body side device, and performing a wireless communication with the main body side device. During communication, when the key card enters a range where communication by electromagnetic induction is possible, a cancel determination circuit that generates a cancel instruction signal to stop communication by wireless and start communication by electromagnetic induction is provided. A key card comprising: 2. The key card according to claim 1, wherein the cancel determination circuit includes a cancel signal from the main body side device by electromagnetic induction while performing wireless communication with the main body side device. A key card which, when a magnetic signal is transmitted, generates a cancel instruction signal for stopping communication by a wireless system and starting communication by electromagnetic induction in response to reception of the cancel signal. 3. A key card that is carried by a user and has a communication function using an electromagnetic induction method and a communication function using a wireless method, and performs communication using an electromagnetic induction method or a wireless method between the key card and the key card. In a keyless entry system including a main unit that performs processing such as locking or unlocking of a door or a steering, the key card detects that a user has started carrying, and uses the electromagnetic induction method. A portable detection circuit that performs either a communication function or a communication function using a wireless method, and the key card is in a range where communication using the electromagnetic induction method is possible while performing communication using the wireless method between the main body side device and the portable detection circuit. Generates a cancel instruction signal to stop the wireless communication and start the electromagnetic induction communication when entering The main body-side device transmits a magnetic signal including a cancel signal by detecting that the key card has entered a range where communication by an electromagnetic induction method is possible. A keyless entry system comprising a circuit.