JPH1113321A - Keyless entry system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discriminate a locked state and a released state of a locking device without demodulating and decoding an answer back signal in a portable machine. SOLUTION: Whether or not a locking device 33 is under a locked state or a released state is detected by a locked-state detecting switch 31 in an on-car machine 3, and a locking acknowledge signal or a releasing acknowledge signal is transmitted from a transmission circuit 29 in response to the detection of the switch 31. Both the locking acknowledge signal and the releasing acknowledge signal are carrier waves, and the timing of on-off is made to differ mutually. When the locking acknowledge signal or the releasing acknowledge signal is received by a reception circuit 12, the signal is output to a driver circuit 16 without demodulation and decoding, and a display section 17 is lit. The acknowledgement of the locked state or the acknowledgement of the released state is discriminated by the method of the lighting of the display section 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyless entry system having an answer back function. In particular, the present invention relates to a keyless entry system for remotely locking and unlocking door locks and trunk lids of vehicles and houses.

[0002]

2. Description of the Related Art In a keyless entry system for a vehicle, a password (I) registered in a portable device in advance is used.
D) is transmitted from the portable device to the vehicle-mounted device, the vehicle-mounted device compares the security code of the received signal with the security code registered in advance in the vehicle-mounted device, and locks each other if they match. The device is operated to lock or unlock the vehicle door.

However, when the vehicle door is locked or unlocked using the keyless entry system as described above, it is necessary to actually check whether the vehicle door is locked or unlocked correctly by the keyless entry system. There was no choice but to operate the door handle and there was no way to check it remotely.

[0004] Therefore, when the vehicle door is locked or unlocked by the portable device, the buzzer or horn of the vehicle is sounded in conjunction therewith, or the room lamp or the hazard flasher lamp is turned on to remotely control the vehicle door. It has been proposed to be able to check the locked or unlocked state of a door.

However, even in such a keyless entry system in which the locked or unlocked state of a vehicle door can be confirmed by sound, light, or the like, considering the environment in which the vehicle is placed, the noise caused by the surrounding noise causes Sounds such as buzzers and horns are drowned out, and it is difficult to confirm the lighting of room lamps etc. due to reduced visibility under sunlight, so check the locked or unlocked state with sound or light To do so was less certain. Conversely, in a quiet ambient environment, sounding a buzzer or horn with a loud sound to confirm locking or unlocking may cause annoyance to the ambient environment. Furthermore, sounding a buzzer or horn or turning on a room lamp draws attention to an unmanned vehicle, and has a problem in terms of antitheft property.

Accordingly, a keyless entry system having an answer back function has been proposed as a keyless entry system that allows only a person having a portable device to check whether a vehicle door is locked or unlocked (Japanese Patent Application Laid-Open No. H10-15764). 61-274061
Gazette, Japanese Utility Model Laid-Open No. 4-62770).

In brief, the keyless entry system having the answerback function is such that an answerback signal (confirmation signal) is returned from the vehicle-mounted device to the portable device as follows. In this system,
Both the receiving circuit of the portable device and the receiving circuit of the in-vehicle device are always in a reception waiting state. When the lock switch of the portable device is turned on, a lock request signal is generated in the control unit, and the antenna for transmission and reception is switched from the reception circuit side to the transmission circuit side, and after the lock request signal is modulated by the transmission circuit, the antenna From the air. When the portable device finishes transmitting the lock request signal, the antenna switches to the receiving circuit side and returns to the reception waiting state.

[0008] On the other hand, when the vehicle-mounted device receives the lock request signal from the portable device with the transmission / reception antenna, the vehicle-mounted device amplifies and demodulates the lock request signal by the receiving circuit and sends it to the control unit. When confirming the lock request signal, the control unit of the on-vehicle device sends an operation signal to a lock device for locking the vehicle door to lock the vehicle door. When detecting that the vehicle door is locked by the vehicle lock state detection switch, the control unit of the in-vehicle device generates an answer back signal and switches the antenna to the transmission circuit side, modulates the answer back signal with the transmission circuit, Radiates from the antenna into the air. When the in-vehicle device also finishes transmitting the answerback signal, the antenna is switched to the receiving circuit side, and again enters the reception waiting state.

When the portable device receives the answer-back signal from the on-vehicle device through the antenna, the portable device amplifies and demodulates the answer-back signal by the receiving circuit and sends the signal to the control unit. Upon receiving the answerback signal, the control unit of the portable device activates the lock confirmation display unit. Therefore, only the owner of the portable device can confirm that the vehicle door is locked by looking at the display unit provided on the portable device.

[0010]

However, in a conventional keyless entry system having an answer-back function, an answer-back signal (lock confirmation signal,
An unlocking confirmation signal) is transmitted from the on-board unit, and the answer back signal is demodulated and decoded on the portable unit side to determine the locked state and the unlocked state, and the display unit for the lock confirmation or the unlock confirmation accordingly. Is turned on, it is necessary to mount a demodulation circuit and a decoder for distinguishing between the lock confirmation signal and the unlock confirmation signal in the portable device.

For this reason, the portable device is increased in size by the mounting area of the demodulation circuit and the decoder, and its portability is hindered and the cost is high. Therefore, the spread of the keyless entry system having the answer back function has been promoted. Hindering.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the conventional example, and has as its object to determine the locked state of a lock device without demodulating or decoding an answerback signal in a portable device. The purpose is to distinguish it from the locked state.

[0013]

DISCLOSURE OF THE INVENTION A keyless entry system according to the present invention comprises a portable device for remotely transmitting a signal for locking or unlocking a lock device, and receiving or receiving a signal from the portable device for locking or unlocking the lock device. A portable unit, wherein the portable unit transmits a signal for locking or unlocking a locking device, and a receiving unit for receiving a carrier signal from the mounted unit. And a notifying unit for notifying that the carrier signal has been received in a mode corresponding to the mode of the received carrier signal, wherein the mounted device receives a signal for locking or unlocking the lock device from the portable device. Transmitting means for transmitting a carrier signal in a predetermined mode for notifying that the locking device has been locked or unlocked when the locking device has been locked or unlocked. It is characterized by that example.

In the keyless entry system of the present invention, a carrier signal in a predetermined mode is transmitted from the mounted device to the portable device as an answer back signal for notifying that the locking device has been locked or unlocked. In the portable device, there is no need to demodulate or decode the signal, so that the circuit configuration of the portable device side receiving unit can be simplified. Therefore, the portable device can be downsized by reducing the mounting area of the circuit components, and the cost of the portable device can be reduced by reducing the number of circuit components.

In such a keyless entry system, the operation can be confirmed by operating the notification means only when the portable device receives the carrier signal. Furthermore, if the signal for notifying that the lock has been performed and the signal for notifying that the lock has been unlocked are carrier signals having different modes, the notification means also operates in a mode corresponding to the mode of the carrier signal. It is possible to easily determine whether to lock or unlock according to the manner of notification by the notification means (for example, a blinking interval for a display lamp or the like). In order to make the carrier signal in a different mode, the on / off timing of the carrier signal may be made different.

As a method of making the ON / OFF timing of the carrier signal different between locking and unlocking, typically, one of the two signals is a continuous carrier signal and the other is an intermittent carrier signal. , A method in which both signals are continuous carrier signals and the signal durations are different from each other, and a method in which both signals are intermittent carrier signals and the intermittent times are different from each other.

If the receiving unit does not receive the confirmation signal from the mounted device within the receivable period, an error display signal is output, so that it is immediately known that the lock device is not operating. And the usability of the portable device can be improved.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

(Configuration of Portable Device and In-Vehicle Device) FIG. 1 is a block diagram showing a configuration of a keyless entry system 1 for a vehicle according to an embodiment of the present invention. The keyless entry system 1 includes a portable device 2 carried by a driver and an in-vehicle device 3 mounted on an automobile.

As shown in FIG. 1, the portable unit 2 includes a control unit 4
Power is supplied by a small battery 5 such as a button battery 5, which is configured mainly of a microcomputer (CPU) and a memory. One of a normally-open locking switch 6 for locking a vehicle door (elevation door) and a normally-open unlock switch 8 for unlocking is connected to ground, and the other is connected via resistors 7 and 9. Battery 5
And is connected to the switch input terminal of the control unit 4.

When the lock switch 6 is in the off state, the lock switch input terminal of the control unit 4 is at the H level, but when the lock switch 6 is turned on, the lock switch input terminal is at the L level. Switch to level. When the switch input terminal on the locking side becomes L level, the control unit 4
A code signal including a lock command code and a password unique to the portable device is transmitted to the transmission circuit 10. Similarly, when the unlock switch 8 is turned on, the switch input terminal on the unlock side is switched to L level, and the control unit 4 sends a code signal including an unlock command code and a unique password code to the transmission circuit 10. I do.

The transmission circuit 10 modulates and amplifies the power by putting the code signal output from the control unit 4 on the carrier signal, and outputs a lock request signal for locking the lock device or unlocking for unlocking the lock device. The request signal is transmitted from the transmission antenna 11 to the on-vehicle device 3 as a radio wave.

The receiving circuit 12 amplifies the carrier signal, which is the answer back signal (lock confirmation signal, unlock confirmation signal) from the vehicle-mounted device 3 received by the reception antenna 13, and sends the amplified signal to the control unit 4. The receiving circuit 12 does not have a function of demodulating a carrier signal which is an answer back signal.

When the control unit 4 receives the carrier signal, which is an answer back signal, from the receiving circuit 12, it outputs the carrier signal to the driver circuit 16 to turn on the display unit 17, which is the notification means.

The display unit 17 serving as the notification means is constituted by a light emitting diode. When a carrier signal which is an answer back signal from the vehicle-mounted device 3 is received, the driver circuit 16 is driven by the control unit 4 and the display unit 17 is turned on. It is turned on.

FIG. 3 is a circuit diagram showing the configuration of the display unit 17 and the driver circuit 16. When a carrier signal which is an answer back signal is received, the control unit 4 changes the output to the driver circuit 16 to H level. Switch to When the output from the control unit 4 becomes H level, a current flows between the resistors 20 and 21 and the base-emitter of the transistor 22 to turn on the transistor 22, so that a current flows through the resistor 23 and the light emitting diode 24 and the light emitting diode 24 emits light. That is, the output to the driver circuit 16 becomes H level only while the carrier signal is being received, and the light emitting diode 24 emits light only during that time. As a result, the display unit 17 as the notification unit is turned on in a mode corresponding to the mode of turning on / off the carrier signal that is the received answerback signal.

The control unit 4, the transmission circuit 10, the timer 15,
The display unit 17, the driver circuit 16, and the like are supplied with power directly from the battery 5, while the receiving circuit 12 is supplied with power from the battery 5 via the timer 15. The control unit 4 outputs a trigger signal to the timer 15 in synchronization with the start of transmission by the transmission circuit 10, and the timer 15 starts and synchronizes with the trigger signal for a certain period of time (transmitted from the transmission circuit 10 by the portable device 2). Thereafter, the time is set up after the in-vehicle device 3 receives the signal from the portable device 2 and is set to be slightly longer than the time until the transmission of the answer back signal to the portable device 2 is completed. The receiving circuit 12 is in a reception waiting state (receivable state) only for a certain period of time from when the timer 15 starts to when the time is up. Accordingly, the receiving circuit 12 enters a reception waiting state in synchronization with the start of transmission by the transmitting circuit 10, and is forcibly returned to the off state after a certain time has elapsed.

As shown in FIG. 2, the portable device 2 has a small size so that it can be carried in a hand.
A transmitting antenna 11 and a receiving antenna 13 are provided on an upper surface,
A lock switch 6, an unlock switch 8, and a display unit 17 are provided on the front surface.

FIG. 1 shows an in-vehicle device 3 mounted on an automobile.
As shown in (1), the control unit 25 is mainly configured by a microcomputer (CPU), a memory, and the like, and is supplied with electric power by an automobile battery.

When the request signal transmitted from the portable device 2 is received by the receiving antenna 27, the receiving circuit 26 of the on-vehicle device 3 amplifies and demodulates the received request signal and outputs it to the decoding circuit 28. The decoding circuit 28 converts the request signal received from the receiving circuit 26 into a digital signal, decodes the encoded request signal, and sends it to the control unit 25.

Upon receiving the request signal from the decoding circuit 28, the control unit 25 of the on-vehicle device 3 transmits a password included in the request signal and a password unique to the on-vehicle device in a password code collating unit (not shown). And. If the passwords match, the control unit 25 responds to the locking command or the unlocking command included in the output from the decoding circuit 28 through the driver circuit 32 to the lock device 3.
3 is operated to lock or unlock the vehicle door.

The on-vehicle device 3 is provided with a lock state detection switch 31 for detecting whether the lock device 33 is in a locked state or an unlocked state. The lock state detection switch 31 is configured by, for example, a limit switch that is turned on and off depending on whether the locking latch of the lock device 31 is in the locked position or the unlocked position.

FIG. 4 is a circuit diagram showing the configuration of the driver circuit 32 and the lock device 33 of the vehicle-mounted device 3. The driver circuit 32 is divided into a driver circuit 32a for locking and a driver circuit 32b for unlocking. I have. The lock device 33 includes two return-type switches 38 and 44 and two DC motors 39 and 4.
5. The switch 38 for locking is
When the coil 37 of the locking driver circuit 32a is excited, it is switched to the power supply side, and when the coil 37 is demagnetized, it returns to the ground side. Similarly, the unlock switch 44 is
When the coil 43 of the unlocking driver circuit 32b is excited, it is switched to the power supply side, and when the coil 43 is demagnetized, it returns to the ground side. The DC motor 39 is for locking,
a Only when electric current flows in the direction of the arrow, it rotates to lock the vehicle door. The DC motor 45 is for unlocking, and rotates only when a current flows in the direction of the arrow b to unlock the vehicle door.

When the output from the decoder circuit 28 includes the locking command code, the control signal (H level) is output from the lock output of the control unit 25 connected to the locking driver circuit 32a. I do. Lock output is H
When the level changes to a level, a current flows through the resistors 34 and 35 and the emitter of the transistor 36 to turn on the transistor 36, so that the coil 37 connected to the collector of the transistor 36 is excited. When the coil 37 is excited, the switch 38 is switched to the power supply side, so that a current flows through the DC motor 39 for locking, and the vehicle door is locked. When the lock state detection switch 31 detects that the lock device 33 is in the locked state, the lock output of the control unit 25 returns to the L level, so that the coil 37 is demagnetized and the switch 38 returns to the DC motor 39. Stops.

Similarly, when the output of the decoder circuit 28 includes an unlock command code, a control signal (H level) is output to the unlock output of the control unit 25 connected to the unlock driver circuit 32b. Is output. Unlock output is H
At the level, the resistors 40 and 41 and the transistor 42
, The transistor 42 is turned on, the coil 43 is excited, and the switch 44 is switched to the power supply side. As a result, a current flows through the unlocking DC motor 45, and the vehicle door is unlocked. When the locked state detection switch 31 detects that the lock device 33 has been unlocked, the coil 43 is demagnetized, the switch 44 returns, and the DC motor 45 stops.

The control unit 25 outputs a control signal to the lock device 33 to lock or unlock the lock device 33, and the lock state detection switch 31 activates the lock device 33.
Is confirmed to be in the locked state or the unlocked state, the control unit 25 outputs a lock confirmation signal or an unlock confirmation signal to the transmission circuit 29 as an answer back signal.

The lock confirmation signal and the unlock confirmation signal are carrier signals having different modes, respectively, and have different ON / OFF timing modes of the carrier signal. For example, between the lock confirmation signal and the unlock confirmation signal, the signal duration of the carrier signal is different, the intermittent time is different, or one is intermittent and the other is a continuous carrier signal.

For example, FIG. 5 (a) shows a combination of a continuous carrier signal and an intermittent carrier signal. The lock confirmation signal is a carrier signal for 0.95 seconds, and the unlock confirmation signal is used. 0.35 seconds on-0.35 seconds off-
The intermittent carrier signal is turned on for 0.35 seconds.

FIG. 5B shows a combination of carrier signals having different signal durations. The lock confirmation signal is a carrier signal that is continuous for one second, and the unlock confirmation signal is a continuous signal for 0.5 seconds. Carrier signal.

FIG. 5C shows a combination of two intermittent carrier signals having different intermittent times.

The transmission circuit 29 power-amplifies the lock confirmation signal or the unlock confirmation signal constituted by the carrier signal,
The signal is transmitted from the transmission antenna 30 to the portable device 2 as a radio wave.
The transmission circuit 29 does not modulate the lock confirmation signal and the unlock confirmation signal.

(Explanation of Operation) Next, the operation and operation of the keyless entry system 1 will be briefly described, taking the case where the lock switch 6 is pressed as an example. FIG. 6 described here is a flowchart illustrating the operation of the portable device 2, and FIG. 7 is a flowchart illustrating the operation of the vehicle-mounted device 3. Then
When the holder of the portable device 2 presses the lock switch 6, the transmission circuit 10 is turned on, and the transmission circuit 10 and the transmission antenna 1 are turned on.
1 transmits a lock request signal to the on-vehicle device 3 (S
1). When the lock request signal is transmitted from the transmission circuit 10, the timer 15 starts (S2).
2 is turned on (S4), and the reception circuit 12 is kept in a reception waiting state until a predetermined time has elapsed and the timer 15 times out (S3, S4, S5). After finishing the transmission, the transmission circuit 10 turns off again.

On the other hand, the on-vehicle device 3 is always in a reception waiting state (S11), and when a signal is received by the receiving circuit 26, if the lock device 33 is in the unlocked state, it is determined whether or not it is a lock request signal. (S12), and when it is determined that the received signal is a lock request signal, a lock is output to the lock device 33 (S13), and the lock device 33 is operated to lock. Next, it is detected by the lock state detection switch 31 whether or not the lock device 33 is in the locked state (S
14) If it is confirmed that the lock state is established, the transmission circuit 29 is powered on and a lock confirmation signal (carrier signal) is transmitted from the transmission circuit 29 (S15). Power off.

When the portable device 2 receives the carrier signal (locking confirmation signal), which is an answer back signal, during a predetermined time during which the timer 15 is in the receiving state (S5), it turns off the receiving circuit 12 (S6). After that, the carrier signal is output to the driver circuit 16 to turn on the display unit 17 (S7).

Although only one display unit 17 is provided in the portable device 2, this display unit 17 is, as described above,
The lighting is performed in a mode corresponding to the ON / OFF mode of the received answerback carrier signal. That is,
Since the ON / OFF timing of the carrier signal is different between the lock confirmation signal and the unlock confirmation signal, the lighting state of the display unit 17 is also different. Therefore, it is possible to confirm whether the lock device 33 is in the locked state or the unlocked state by the one display unit 17. For example, the lock confirmation signal and the unlock confirmation signal are shown in FIG.
If the waveform is as shown in (a), in the case of the lock confirmation signal, the display unit 17 is continuously turned on for a certain period of time.
In the case of the unlock confirmation signal, the display unit 17 blinks, so that both signals can be distinguished.

On the other hand, if the timer 15 times out after a certain period of time without the portable device 2 receiving the carrier signal as the answer back signal (S3), the receiving circuit 12 is turned off (S8). In this case, the display unit 17 is not turned on.

When the unlock switch 8 is pressed,
Since the portable device 2 and the on-vehicle device 3 perform the same transmission and reception operation, the description is omitted.

In the keyless entry system 1 having such a two-way answer back function, the energization of the receiving circuit 12 is managed by the timer 15 so that the receiving circuit 12 can receive the signal only for a certain period of time after transmission. Receiving circuit 12
Is turned off, the average current consumption of the portable device 2 can be drastically reduced.

According to such an embodiment, the receiving circuit 12 having no demodulation function can be used in the portable device 2, and no decoding circuit is required, so that the configuration of the portable device 2 can be simplified. As a result, the size and cost of the portable device 2 can be reduced. Also, the display unit 17 does not need to be provided with two types, one for lock confirmation and the other for unlock confirmation, and only one is required. This also contributes to downsizing and cost reduction of the portable device 2. Further, as shown in FIG. 6, the receiving operation of the portable device 2 is such that, when a carrier signal which is an answer back signal is received, the answer back signal is determined without determining whether the signal is a lock confirmation signal or an unlock confirmation signal. Since it is only necessary to output a signal directly to the display unit 17 and light it, the processing can be simplified.

(Second Embodiment) FIG. 8 is a block diagram showing a configuration of a portable device 2 of a keyless entry system 61 according to another embodiment of the present invention. In this portable device 2, one of the lock switches 6 is connected to the high potential side of the battery 5, the other is connected to a switch input terminal on the lock side of the control unit 4, and one of the unlock switches 8 is also connected. The battery 5 is connected to the high potential side, and the other is connected to the switch input terminal on the unlocking side of the control unit 4. Further, each switch input terminal of the control unit 4 is connected to the ground via the resistors 62 and 64, and is connected to the current supply terminal of the receiving circuit 12 via the diodes 63 and 65, respectively.

In the portable device 2, when the lock switch 6 is pressed, for example, the switch input terminal on the lock side of the control unit 4 becomes the battery voltage level (H level), and the control unit 4 outputs the signal. The lock request signal is transmitted by the transmission circuit 10
After being modulated and amplified by the transmission antenna 11. Similarly, when the unlock switch 8 is pressed, the switch input terminal on the unlock side of the control unit 4 is set to the battery voltage level (H level).
After the unlock request signal output from the control unit 4 is modulated and amplified by the transmission circuit 10, the transmission antenna 1
Sent from 1. The transmission circuit 10 is powered on when the lock switch 6 or the unlock switch 8 is pressed. However, even if the lock switch 6 or the unlock switch 8 is kept pressed, the power is automatically turned off by the control unit 4 after a certain period of time. Is done.

On the other hand, the lock switch 6 or the unlock switch 8
When is pressed, a current is supplied from the battery 5 to the receiving circuit 12 via the diodes 63 and 65, and the receiving circuit 12 is powered on in synchronization with the ON operation of the lock switch 6 or the unlock switch 8. The receiving circuit 12 is kept in a reception waiting state while the lock switch 6 or the unlock switch 8 is pressed, and when the lock switch 6 and the unlock switch 8 return,
Power off.

In the portable device 2, for example, in the case of locking, after pressing the lock switch 6 of the portable device 2 and transmitting a lock request signal, the portable device 2 waits while keeping the lock switch 6 pressed for a while. By receiving the lock confirmation signal, the lock state can be confirmed.

Therefore, in the portable device 2, the transmission circuit 10 is turned on for a certain period of time after the lock switch 6 or the unlock switch 8 is turned on, and the reception circuit 12 is locked or unlocked. Since the switch is ON only while the key is pressed, the current consumption can be greatly reduced as compared with a conventional portable device in which the receiving circuit is always in a reception waiting state.

Also in this embodiment, the vehicle-mounted device 3 transmits a lock confirmation signal or an unlock confirmation signal in which the on / off timing of the carrier signal is changed as an answer back signal, and the portable device 3 demodulates the answer back signal. The display unit 17 is turned on by directly outputting to the driver circuit 16 without performing decoding or decoding.

In this embodiment, the lock switch 6
Alternatively, the power is directly supplied from the battery 5 to the receiving circuit 12 via the unlock switch 8, but as shown in FIG. 9, the power is supplied from the battery 5 to the receiving circuit 12 via the switching element 66 such as a transistor. To supply power,
The switching element 66 may be turned on only while the lock switch 6 or the unlock switch 8 is pressed, and the receiving circuit 12 may be powered on. With such a configuration, the same operation as the embodiment of FIG. 8 can be performed.

(Third Embodiment) FIG. 10 shows a keyless entry system 71 according to still another embodiment of the present invention.
FIG. 3 is a block diagram showing the configuration of FIG. FIG. 11 shows the portable device 2
FIG. In this embodiment, each time one operation switch 72 provided on the portable device 2 is pressed, the vehicle-mounted device 3 alternately switches between a locking operation and an unlocking operation.

In the portable device 2, when the operation switch 72 is pressed, a request signal is output from the control unit 4 and transmitted from the transmission antenna 11 after being modulated by the transmission circuit 10, but transmitted from the transmission antenna 10. The request signal does not distinguish between locking and unlocking (that is, does not include a locking command code or an unlocking command code). In this portable device 2, as in the first embodiment, the reception circuit 12 is powered on in synchronization with the transmission from the transmission circuit 10, and the timer 15 is started. When the power goes up, the receiving circuit 12 is turned off.

In the in-vehicle device 3, when the receiving circuit 26 receives the request signal from the portable device 2, the control unit 25 checks the detection state of the lock state detection switch 31 and instructs the driver circuit 32 to invert the state. The locking device 33 is operated by outputting a signal. That is, the lock device 3
When the receiving circuit 26 receives a request signal from the portable device 2 when the lock state detection switch 31 detects the locked state when the lock circuit 3 is in the locked state, the control unit 25 sets the unlocked driver circuit. 32b to drive the locking device 33
Is unlocked [see FIG. 4]. When the lock device 33 is unlocked, the locked state detection switch 31 switches to detect the unlocked state, and an unlocking confirmation signal is sent from the transmission circuit 29 to the portable device 2.
Sent to Therefore, when the receiving circuit 26 receives the request signal from the portable device 2 once again, the control unit 25 drives the driver circuit 32a on the locking side to lock the locking device 33, and when the locking state detection switch 31 detects the locked state, A lock confirmation signal is transmitted from the transmission circuit 29 to the portable device 2.

Therefore, in this embodiment, each time the operation switch 72 provided on the portable device 2 is operated and the request signal is transmitted, the vehicle-mounted device 3 alternately switches between the locked state and the unlocked state. The confirmation signal or the unlock confirmation signal is transmitted to the portable device 2, and the lock confirmation or unlock confirmation display portions 17 and 19 of the portable device 2 are turned on.

According to the keyless entry system 71 having such a configuration, the number of switches of the portable device 2 can be reduced to one. Therefore, the area occupied by the operation switches 72 is reduced, and the size of the portable device 2 can be reduced. it can. Alternatively, the operability can be improved by increasing the operation switch 72.

(Fourth Embodiment) FIG. 12 shows a keyless entry system 74 according to still another embodiment of the present invention.
2 is a block diagram showing a configuration of the portable device 2 of FIG. This portable device 2 allows the vehicle-mounted device 3 to alternately switch between the locking operation and the unlocking operation by operating one operation switch 72 in the same manner as in the embodiment of FIGS. As described above, the power from the battery 5 is supplied to the receiving circuit 12 by the resistor 75 and the diode 76, and the receiving circuit 12 is powered on only while the operation switch 72 is kept pressed, and is released when the operation switch 72 is released.
Is automatically turned off.

(Fifth and Sixth Embodiments) In a case where demodulation and decoding are not required on the portable device 2 side by transmitting a lock confirmation signal or an unlock confirmation signal with a carrier signal,
Another example of the notification means for confirming the locked state or the unlocked state will be described.

The portable device 2 shown in FIG. 13 has a built-in vibration generator 93 as notification means for confirming the locked state or the unlocked state. This vibration generator 93
As shown in FIG. 14, an eccentric weight 96 is attached to a rotation shaft 95 of a motor 94. When the motor 94 is rotated, the eccentric weight 96 rotates to generate a vibration that can be felt. When the answer back signal is output to the driver circuit 97 as shown in FIG. 15, the vibration of the vibration generator 93 changes according to the ON / OFF timing of the carrier signal. , It can be determined whether or not it is in the unlocked state.

FIG. 16 shows a buzzer 9 as a notifying means for confirming a locked state or an unlocked state.
8 is a portable device 2 having a built-in 8. When the answer back signal is output to the driver circuit 99 as shown in FIG. 17, the tone or sounding timing of the buzzer 98 differs depending on the waveform or on / off timing of the carrier signal. It is possible to determine whether it is in the locked state.

(Seventh Embodiment) FIG. 18 shows a portable device 2 of a keyless entry system 101 according to still another embodiment of the present invention, in which the receiving circuit 12 of the portable device 2 waits for reception. If the answer back signal from the in-vehicle device 3 is not received, the portable device 2 outputs an error display signal, outputs the error display signal to the driver circuit 16, and turns on the display unit 17 with the error display signal. Like that.

FIGS. 19A and 19B show a lock confirmation signal and an unlock confirmation signal generated by the on-vehicle device 3, respectively.
(C) shows an error display signal generated in the portable device 2, and since the ON / OFF timings of the carrier signals are different from each other, the same display unit 17 is used for these signals.
Is turned on, it is possible to determine which signal it is from the way of lighting.

FIG. 20 is a flowchart showing the receiving operation of the portable device 2 according to this embodiment. As is clear from the comparison between the flowchart of FIG. 20 and the flowchart of FIG.
In this embodiment, when the receiving circuit 12 is powered off without receiving the answer back signal, an error display signal is output to blink the display unit 17 (S9).

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a keyless entry system according to an embodiment of the present invention.

FIG. 2 is a front view showing the portable device of the keyless entry system according to the first embodiment;

FIG. 3 is a circuit diagram showing an electrical configuration of a display unit in the portable device of the above.

FIG. 4 is a circuit diagram showing a configuration of a drive circuit and a lock device in the vehicle-mounted device according to the first embodiment;

FIGS. 5A, 5B and 5C are diagrams showing combinations of various carrier signals serving as a lock confirmation signal and an unlock confirmation signal.

FIG. 6 is a flowchart illustrating a receiving operation of the portable device.

FIG. 7 is a flowchart illustrating an operation of the vehicle-mounted device.

FIG. 8 is a block diagram illustrating a configuration of a portable device according to another embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration of a portable device according to still another embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of a keyless entry system according to still another embodiment of the present invention.

FIG. 11 is a front view of the portable device according to the embodiment.

FIG. 12 is a block diagram showing a configuration of a portable device according to still another embodiment of the present invention.

FIG. 13 is a front view of a portable device of a keyless entry system according to still another embodiment of the present invention.

FIG. 14 is a diagram showing a vibration generator built in the portable device of the above.

FIG. 15 is a diagram showing a driver circuit for driving the vibration generator of the above.

FIG. 16 is a front view of a portable device of a keyless entry system according to still another embodiment of the present invention.

FIG. 17 is a diagram showing a driver circuit for driving a buzzer built in the portable device of the above.

FIG. 18 is a front view of a portable device of a keyless entry system according to still another embodiment of the present invention.

FIGS. 19 (a), (b) and (c) are diagrams showing examples of waveforms of a lock confirmation signal, an unlock confirmation signal, and an error display signal based on a carrier signal.

FIG. 20 is a flowchart illustrating a reception operation in the portable device.

[Explanation of symbols]

 2 Mobile device 3 In-vehicle device 4 Control unit 5 Battery 6 Lock switch 8 Unlock switch 16 Driver circuit 17 Display unit 10 Transmission circuit 12 Receiving circuit 72 Operation switch

Claims (6)

[Claims] 1. A keyless entry system comprising: a portable device for remotely transmitting a signal for locking or unlocking a lock device; and a mounting device for receiving a signal from the portable device and locking or unlocking the lock device. A system, wherein the portable device transmits a signal for locking or unlocking a locking device, a receiving unit for receiving a carrier signal from the mounted device, and a mode of the received carrier signal. Notifying means for notifying that the carrier signal has been received in a mode corresponding to the above, wherein the mounting device receives a signal for locking or unlocking the locking device from the portable device, and the locking device is locked or unlocked. A keyless electronic device comprising a transmitting means for transmitting a carrier signal in a predetermined mode for notifying that the locking device has been locked or unlocked when unlocked. Tree system. 2. The mounting device according to claim 1, wherein the on-off and off-on timings of the carrier signals are different from each other. The mobile device transmits the carrier signal as the carrier signal of the above, and the portable device notifies the notifying unit that the carrier signal has been received at different ON / OFF timings in correspondence with the mode of the carrier signal. The keyless entry system according to claim 1, wherein the notification is performed. 3. The mounting machine according to claim 1, wherein one of the carrier signals is continuous and the other is intermittent, and the carrier signal is in a predetermined mode for notifying that the locking is performed, and is notified of unlocking. The mobile device transmits the carrier signal as a carrier signal in a predetermined mode for transmitting the carrier signal in a mode in which one is continuous and the other is intermittent, corresponding to the mode of the carrier signal. 3. The keyless entry system according to claim 2, wherein the notification unit notifies the reception unit of the reception. 4. The mounting machine according to claim 1, wherein the carrier signals are continuous carrier signals and have different signal durations from each other. The portable device transmits the carrier signal as a carrier signal of a predetermined mode for notifying, and the portable device reports that the carrier signal has been received in a mode in which durations are different from each other in accordance with the mode of the carrier signal. The keyless entry system according to claim 2, wherein the notification is made by means. 5. The mounting machine according to claim 1, wherein the carrier signals are intermittent carrier signals having different intermittent times, and the carrier signals are in a predetermined mode for notifying that the locking is performed, and the carrier signals are unlocked. The portable device transmits the carrier signal as a carrier signal of a predetermined form for notifying, and the portable device reports that the intermittent times are different from each other in accordance with the form of the carrier signal. The keyless entry system according to claim 2, wherein the notification is made by means. 6. The portable device outputs an error display signal when it does not receive a confirmation signal transmitted from the mounted device within a period in which the receiving unit can receive. Item 2. The keyless entry system according to item 1.