JP2002021386A - Radio key system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio key system increasing the serviceability of a portable device to users and elongating the battery life of the portable device. SOLUTION: The portable device 2 has a vibration detecting circuit 20 for detecting the vibration of the portable device 2, a low current consumption type receiving circuit 22, a transmitting circuit 23 for transmitting ID signals, and a control circuit 25 for operating the receiving circuit 22 in accordance with a vibration detection signal of the vibration detecting circuit 20 and controlling the transmitting circuit 23 to transmit the ID signal on receiving a request signal. A fixed device 1 has a transmitting circuit 10 for transmitting the request signal, a receiving circuit 13 for receiving the ID signal from the portable device 2, and a control circuit 15 for causing the transmitting circuit 10 to transmit the request signals at preset intervals and outputting a signal for controlling a lock to be undone when the receiving circuit 13 receives the ID signal transmitted from the portable device 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio key system for locking and unlocking a door of a vehicle or the like using a portable wireless device or the like.

[0002]

2. Description of the Related Art Conventionally, as a system of this type, an ID signal is transmitted by pressing a push button provided on a key or the like serving as a portable device, the ID signal is received by a vehicle or the like, and a door lock is locked. Some were locked and unlocked. However, when the push button of the portable device is pushed, there is a problem that the push button must be operated to lock and unlock the door.

For this reason, a radio key system using a portable device for transmitting an ID signal without pressing a push button has been conventionally proposed.
Some devices transmit a signal, and some devices detect vibration of the portable device to extend the life of a battery used in the portable device, and transmit an ID signal when the vibration is detected.

[0004]

However, in the conventional radio key system, the ID signal is transmitted even when the door is not locked or unlocked.
The battery life of the portable device is shorter than that of pressing a push button, and it has been desired to further extend the battery life of the portable device.

[0005] Here, the battery life of the portable device is dominated by the amount of current consumed by the transmitting circuit for transmitting the ID signal and the number of times of transmitting the ID signal, when the battery capacity is fixed. . The magnitude of the current consumed by the transmission circuit and the number of times the ID signal is transmitted are caused by the convenience of the radio key system, a sense of incongruity in operation, and the like, and particularly, the magnitude of the current consumed by the transmission circuit. In this type of radio key system, in order to satisfy the electric field strength prescribed in Article 6 "Radio stations whose emitted radio waves are extremely weak" in the General Regulations of the Radio Law, which is generally applied, , Is a variable that cannot be changed.

[0006]

SUMMARY OF THE INVENTION A radio key system according to the present invention comprises a fixed device and a portable device.
In a radio key system for transmitting and receiving a D signal to lock and unlock a lock on a fixed machine, the portable machine receives a vibration detection circuit for detecting vibration of the portable machine and a request signal transmitted from the fixed machine. A low-current-consumption type receiving circuit, a transmitting circuit for transmitting an ID signal to the stationary device, and a request signal transmitted from the stationary device based on the vibration detection signal of the vibration detecting circuit. , A control circuit that controls a transmission circuit to transmit an ID signal when receiving the fixed signal, the fixed machine transmits a request signal,
A receiving circuit for receiving an ID signal from the portable device, and transmitting a request signal from a transmitting circuit at a preset interval,
And a control circuit for outputting a signal for controlling unlocking when the ID signal transmitted from the portable device is received by the receiving circuit.

[0007]

FIG. 1 is a block diagram showing a configuration of a radio key system according to an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a vehicle-mounted device mounted on a vehicle or the like, and 2 denotes a portable device, which is attached to, for example, a key of a car.
Also, the on-vehicle device 1 includes a transmitting circuit 10 and a transmitting antenna 11 for constantly transmitting a request signal at fixed intervals, a receiving antenna 12 and a receiving circuit for receiving an ID signal returned in response to the transmitted request signal. 13, an I / F circuit 14 that interfaces with the outside and locks and unlocks doors and the like, controls the transmission circuit 10, the reception circuit 13, and the I / F circuit 14, and receives the received ID.
The control circuit 15 is configured to collate the signal with a pre-registered ID and output a locking / unlocking signal of the door lock if the collation result is correct.

The portable device 2 also includes a vibration detecting circuit 20 for detecting a vibration applied to the portable device, a receiving antenna 21 and a receiving circuit 22 for receiving a request signal, and responding to the request signal when receiving the request signal. The transmission circuit 23 and the transmission antenna 24 that oscillate the ID signal at a high frequency, and the power supply of the reception circuit 22 is controlled in accordance with the output of the vibration detection circuit 20, and the ID signal is transmitted in response to the reception of the request signal. The control circuit 25 outputs the data to the control circuit 23.

Here, the configuration of the receiving circuit 22 of the portable device 2 will be described. FIG. 2 is a block diagram showing a configuration of a receiving circuit on the portable device 2 side of this embodiment, which is a low power consumption type super-reproduction type receiving circuit. In FIG. 2, 31 is a filter circuit, 32 is an amplifying circuit, 33 is a reproduction oscillation circuit, 34 is an envelope detection circuit, 35 is a filter circuit, 36 is an amplifying circuit, 37 is a waveform shaping circuit, 38 is a filter circuit, and 39 is a filter circuit. This is a quenching oscillation circuit that controls the reproduction oscillation circuit 33.

In this embodiment, the receiving operation is performed by a low current consumption type receiving circuit as shown in FIG.
1/1 compared to the current consumption of the transmission circuit in the prior art
Current consumption of about 0 (for example, current consumption of 5 mA in the transmission circuit)
On the other hand, the receiving operation can be performed at a current consumption of about 0.5 mA in the receiving circuit).

Next, the operation of this embodiment will be described. First, the operation of the portable device 2 will be described. On the portable device 2 side, when the person holding the portable device 2 is sitting or standing still and stopped, or when the portable device 2 is stored and no vibration is applied to the portable device 2, Since the vibration detection circuit 20 does not detect the vibration, the detection signal is not output, the control circuit 25 does not control the reception circuit 22, and the power is not supplied to the reception circuit 22 of the portable device 2. .

Therefore, since the receiving circuit 22 is not operating, no request signal is received from the vehicle-mounted device 1 and no ID signal is transmitted from the transmitting circuit 23. In this state, the portable device 2
Also, the transmission circuit 23 does not operate, the microcomputer in the control circuit 25 is also in a sleep state, and the current consumption is the smallest.

When the person holding the portable device 2 is walking or the like, the vibration generated by the operation causes the vibration detection circuit 20 to detect the vibration, and the detection signal is output to the control circuit 25. .

Here, the details of the vibration detection circuit 20 will be described. First, the vibration detection circuit 20 includes, for example, a mechanism switch and a pulse counter (not shown). When vibration is applied to the portable device 2, the mechanism switch is turned on, and a signal is output to the pulse counter. In the pulse counter to which the signal from the mechanism switch is input, when the signal is received n times, the control circuit 2 receives the signal m times.
5 to perform an operation such as outputting a signal.

The operation of the pulse counter is, for example, as follows.
Assuming that n = 2 and m = 1, a signal may be output once to the control circuit 25 when the mechanism switch is turned on twice, or n
= 1 and m = 1, a signal may be output to the control circuit 25 once when the mechanism switch is turned on once. Further, n and m may be arbitrarily set from outside. The configuration of the vibration detection circuit 20 is not limited to the above configuration, and any configuration may be used as long as it can detect the vibration of the portable device 2 and output the detection signal. Good.

Then, the control circuit 25 that has obtained the detection signal output from the vibration detection circuit 20 controls the power supply of the reception circuit 22 and makes the reception circuit 22 operative for a given arbitrary time. When a request signal is received from the vehicle-mounted device 1 while the receiving circuit 22 is in the operating state, the control circuit 25
Controls the transmission circuit 23 immediately to return an ID signal in response thereto, causes high-frequency oscillation according to the ID signal, and returns the ID signal via the transmission antenna 24.

When the control circuit 25 does not receive the request signal while operating the receiving circuit 22 for a given fixed time, the control circuit 25 does not control the transmitting circuit 23 and The microcomputer in the microcomputer 25 shifts to a sleep state, and shifts to a state of waiting for an input from the vibration detection circuit 20.

Next, the operation of the vehicle-mounted device 1 will be described. On the on-vehicle device 1 side, the control circuit 15 controls the transmission circuit 10 and transmits the request signal via the transmission antenna 11 in order to always transmit the request signal at a certain fixed interval.

After transmitting the request signal, the control circuit 15 controls the receiving circuit 13 in order to receive the ID signal when the ID signal is returned from the portable device 2, and controls the receiving circuit 13 for an arbitrary predetermined time. 13 is activated. Then, when an ID signal transmitted from the portable device 2 is received via the reception antenna 12 during this time, the control circuit 15
The received ID signal is compared with a pre-registered ID,
If the collation result is correct, a signal for locking and unlocking the door is output, and the I / F circuit 14 outputs this signal to the outside.

As described above, by operating the portable device 2 and the on-vehicle device 1, when the person holding the portable device 2 approaches the car to use the car, the walking operation is performed by the walking operation.
When vibration is applied to the portable device 2 and the portable device 2 is ready to receive a request signal from the vehicle-mounted device 1 and the distance between the vehicle and the user falls within a certain range, the vehicle-mounted device 1 mounted on the vehicle 1 The portable device 2 receives the request signal transmitted from the mobile device 2, and an ID signal is transmitted from the portable device 2 in response to the request signal.
The car door is unlocked.

When the onboard unit 1 receives the ID signal transmitted from the portable unit 2 after the person holding the portable unit 2 gets off the car, the onboard unit 1 locks the door of the car. Is done.

Next, a description will be given of the operation when the person holding the portable device 2 approaches the car when he or she does not intend to get on the car, or when the person just passes the vicinity of the car. Even if the person carrying the portable device 2 approaches the car when he or she does not intend to get on the car, or just passes by the vicinity of the car, etc., the user holds the portable device 2 by the above-described operation. When a person goes to a certain area with a car and approaches the area,
Receives the ID signal from the portable device 2 and unlocks the door.

Therefore, when the person holding the portable device 2 does not intend to get on the car, the door is not unlocked or the door is unlocked and then locked. It is desirable to do so. Hereinafter, the operation example will be described.

(1) After unlocking the door, if there is no operation within a certain period of time after the door is unlocked, the in-vehicle unit 1 receives the ID signal from the portable unit 2 and unlocks the door. However, if the person holding the portable device 2 does not intend to get on the car, the operation of the ride is, for example, no operation of the door knob. Therefore, the operation is monitored, and after the door is unlocked, A preset time (for example, 10 seconds)
If the doorknob is not operated within this time, lock the door. (2) After confirming the ID signal from the portable device 2, unlocking is performed when a ride operation is performed within a predetermined time. First, the vehicle-mounted device 1 receives the ID signal from the portable device 2 and locks the door. An unlocking operation is performed, but the unlocking operation is not performed at this time, but the unlocking is performed when, for example, an operation of a door knob is performed as a boarding operation within a predetermined time. Thus, the in-vehicle device 1 does not perform the unlocking operation only by receiving the ID signal from the portable device 2, but unlocks only when there is a will of the ride.

Next, the battery life of this embodiment will be described. Table 1 is a table comparing the battery life in this embodiment with the battery life in the prior art. In Table 1,
As a condition, the battery capacity is a coin-type lithium battery (CR20) widely used in a radio key system that requires a push button operation which is generally used at present.
25 equivalent) at room temperature. The number of movements is set at 5 km / h and a stride of 70 cm, and when walking 10,000 steps a day, and 5,000 times a day when moving once every two steps.

In the prior art, the current consumption and the operation time are the current and the time required for the transmission circuit to transmit the ID signal. In this embodiment, the current consumption and the operation time are the time required for the reception circuit to operate to receive the request signal. Required current and time.

In this embodiment, the average number of rides per day is assumed to be 10 times, and the ID signal is transmitted for these 10 times. And time. As shown in Table 1, it can be seen that the battery life is extended about six times as compared with the prior art.

In this embodiment, the portable device 2 is provided with a low current consumption type receiving circuit 22 having a current consumption of less than 1 mA, and the receiving circuit 2 is provided only when the portable device 2 is vibrated.
2 is operated, and the ID signal is transmitted only when the request signal from the on-vehicle device 1 is received by the receiving circuit 22, so that the current consumed on the portable device 2 side can be reduced, The convenience of the user of the portable device 2 can be improved, and the battery life can be prolonged.

[0029]

[Table 1]

In this embodiment, a car has been described as an example. However, the present invention is not limited to this, and any system that unlocks and locks a lock using a radio key system can be used. The present invention may be applied to any system. For example, by installing the in-vehicle device 1 at a door of a building, the present invention can be applied to an entry management system.

[0031]

As described above, according to the present invention, a portable device is provided with a vibration detecting circuit for detecting the vibration of the portable device, and a low current consumption type receiving circuit for receiving a request signal transmitted from the fixed device. And a transmitting circuit for transmitting an ID signal to the fixed machine; and a receiving circuit operating based on the vibration detection signal of the vibration detecting circuit, and when the request signal transmitted from the fixed machine is received, the transmitting circuit is controlled. A fixed circuit for transmitting a request signal, a receiving circuit for receiving an ID signal from a portable device, and a request circuit at a predetermined interval from the transmitting circuit. A signal is transmitted, and when the ID signal transmitted from the portable device is received by the receiving circuit, the control circuit outputs a signal for controlling the unlocking of the lock. Flow can be reduced, to improve the user friendliness of the portable device further has the advantage that it can also be longer battery life of the portable device.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a radio key system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a reception circuit on the portable device 2 side of the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 vehicle-mounted device (fixed device) 2 portable device 10 transmission circuit 11 transmission antenna 12 reception antenna 13 reception circuit 14 I / F circuit 15 control circuit 20 vibration detection circuit 21 reception antenna 22 reception circuit 23 transmission circuit 24 transmission antenna 25 control circuit

Claims (4)

[Claims] 1. A radio wave key system comprising a fixed machine and a portable machine, transmitting an ID signal from the portable machine and locking / unlocking the lock on the fixed machine, wherein the portable machine comprises: Means for receiving a request signal transmitted from a portable device by a low-current-consumption type receiving circuit only when vibration is applied to the portable device, and transmitting an ID signal when receiving the request signal transmitted from the fixed device. The fixed device has a means for transmitting the request signal at a preset interval and, when receiving the ID signal transmitted from the portable device, outputting a signal for controlling unlocking of the lock. Radio key system characterized by the following. 2. A radio key system comprising a fixed machine and a portable machine, transmitting an ID signal from the portable machine, and locking / unlocking the lock of the fixed machine, wherein the portable machine comprises: A vibration detection circuit for detecting vibration of the machine, a low current consumption type receiving circuit for receiving a request signal transmitted from the stationary machine, a transmission circuit for transmitting an ID signal to the stationary machine, Based on the vibration detection signal of the detection circuit, to operate the receiving circuit, when receiving the request signal transmitted from the fixed machine, control the transmission circuit, having a control circuit to transmit an ID signal, The fixed device includes: a transmission circuit that transmits the request signal; a reception circuit that receives an ID signal from the portable device; and a request circuit that transmits a request signal at a preset interval from the transmission circuit. Wherein upon receiving the ID signal transmitted from the portable device, electric-wave key system, characterized in that a control circuit for outputting a signal for controlling the unlocking of the lock by. 3. The control circuit of the fixed device, after receiving the ID signal transmitted from the portable device, performs an operation preset by an owner of the portable device within a predetermined time period. 3. The radio key system according to claim 2, wherein a signal for controlling locking of the lock is output when the lock is not established. 4. A radio key system comprising a fixed machine and a portable machine, transmitting an ID signal from the portable machine, and locking / unlocking the lock of the fixed machine, wherein the portable machine comprises: A vibration detection circuit for detecting vibration of the machine, a low current consumption type receiving circuit for receiving a request signal transmitted from the stationary machine, a transmission circuit for transmitting an ID signal to the stationary machine, Based on the vibration detection signal of the detection circuit, to operate the receiving circuit, when receiving the request signal transmitted from the fixed machine, control the transmission circuit, having a control circuit to transmit an ID signal, The fixed device includes: a transmission circuit that transmits the request signal; a reception circuit that receives an ID signal from the portable device; and a request circuit that transmits a request signal at a preset interval from the transmission circuit. A control circuit for receiving an ID signal transmitted from the portable device, and outputting a signal for controlling unlocking of the lock when an operation preset by the owner of the portable device is performed. A radio key system characterized by the following.