JPS63138083A - Keyless entry apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a keyless entry device that can operate a locking/unlocking device provided on a vehicle door, trunk, etc. from a location away from the vehicle. In particular, the present invention relates to a receiving means of a keyless entry device.

(Prior Art) In a keyless entry device, for example, the driver operates a switch on the transmitting means instead of a key, causing the transmitting means to transmit a specific code, and receiving this specific code is received by the receiving means. Doors are locked and unlocked, trunks are opened, etc. only when the specific code received by the receiving means matches the setting code set in the receiving means.

Such a keyless entry device is known, for example, from Japanese Patent Application Laid-open No. 57
-9972, etc.

(Problems to be Solved by the Invention) Conventional keyless entry devices have a problem in that when the switch of the transmitting means is operated, the door, trunk, etc. will open even if the operation is erroneous.

Therefore, the technical object of the present invention is to configure a keyless entry device that does not open the door, trunk, etc. if the switch of the transmitting means is operated by mistake.

[Structure of the invention]

(Means for solving the problem) The means taken to achieve the above-mentioned technical problem are: a portable transmitting means for transmitting a predetermined code; at least one locking/unlocking means; and from the transmitting means. a plurality of receiving means for receiving signals of the plurality of receiving means; a first comparing and determining means connected to the plurality of receiving means and determining the reception state of the plurality of receiving means; and a first comparison judgment means connected to at least one of the plurality of receiving means. a second comparing and determining means for determining the code transmitted by the transmitting means; and determining a combination of the outputs of the first comparing and determining means and the second comparing and determining means, and locking and unlocking the at least one locking and unlocking means. This is because a drive means for selectively driving is provided.

(Operation) A keyless entry device is usually designed to operate only in the vicinity of a vehicle. That is, the keyless encoder +J device is designed to operate only within a range of approximately 2 to 4 meters between the transmitting means and the receiving means.

According to the configuration of the present invention described above, the code transmitted by the switch operation of the transmitting means is received by the plurality of receiving means almost simultaneously. The reception states of the plurality of reception means are then compared by the first comparison and determination means.

At the same time, the second comparing and determining means determines whether the code transmitted by the switch operation of the transmitting means matches the setting code set in the receiving means.

Then, the driving means determines the combination of the outputs of the first comparison and determination means and the second comparison and determination means, selects and operates the locking and unlocking means.

As described above, according to the configuration of the present invention, it is possible to determine whether the code transmitted by the difference in the reception status of a plurality of reception means or by the switch operation of the transmission means matches the setting code set in the reception means. The locking/unlocking means can be selected and activated by Therefore, it is possible to construct a keyless entry device in which the door, trunk, etc. do not open if the switch of the transmitting means is operated by mistake.

In a preferred embodiment of the invention, the transmitting means includes:
Storage means for storing at least two codes; selection means for selecting one code from the at least two codes stored by the storage means; modulation connected to the selection means for modulating and transmitting the one code; Have the means.

Then, by selecting the code transmitted by the transmitting means, a plurality of locking/unlocking means can be selected and activated.

Further, in another preferred embodiment of the present invention, the plurality of receiving means include a non-directional first antenna and a directional second antenna; , a switching means for selecting the first antenna and the second antenna and connecting the selected antenna to the detection means.

In this way, the positional relationship between the transmitting means and the receiving means can be grasped based on the magnitude of the signal level received by the first and second antennas, and a plurality of locking/unlocking means can be selected and activated.

Furthermore, in another preferred embodiment of the present invention, the locking/unlocking means includes a door locking device for controlling locking/unlocking of a door of the vehicle, and a trunk locking device for controlling locking/unlocking of a trunk of the vehicle. This allows the keyless entry device to lock and unlock the doors of the vehicle and the trunk of the vehicle.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing the circuit configuration of a transmitter 1 of a keyless entry device of the present invention.

The transmitter 1 includes, as a storage means, a code generation means 2 that stores two codes, a modulation oscillation means 3 that modulates the code generated by the code generation means 2, and an output circuit that amplifies the signal modulated by the modulation oscillation means 3. It is equipped with 4.

The code generation means 2 includes two switches SWI.

SW2 is connected. Further, an antenna ANT1 is connected to the output circuit 4.

The code generating means 2 includes an oscillator that generates a clock pulse, and a code generator that generates a clock pulse in synchronization with the clock pulse generated by the oscillator.
Sequential ROM that outputs data sequentially (Seq
uential Read 0nly Memory
). As the sequential ROM, for example, Fujitsu's M88541P or the like can be used. MB854
1P is a sequential ROM capable of storing 256 words x 1 bit, and outputs sequentially stored 256-bit information bit by bit in response to an input clock pulse.

The modulation oscillation means is a well-known FM modulation circuit.

In the case of this embodiment, the oscillation frequency is 60 MHz. The amplifier circuit is a well-known high frequency amplifier circuit that amplifies the power of a 60 MHz signal.

When the switch SWI is operated, the code generating means 2 generates a code for operating the door lock device 17 at least twice. Further, the code generating means 2 is operated by a switch S.
The door lock device 17 is repeatedly activated while the WI is operated.
Generate the code to make it work. This code is FM-modulated by the modulation oscillation means, amplified by the output circuit 4, and then transmitted from the antenna ANT1.

When the switch SW2 is operated, the code generating means 2 generates a code for opening the trunk oven device 18 at least twice. Further, the code generating means 2 repeatedly generates a code for opening the trunk oven device 18 while the switch SW2 is operated. Then, this code is FM modulated by the modulation oscillation means, and the output circuit 4
The signal is amplified by the antenna ANTl and then transmitted from the antenna ANTl.

Note that the code for operating the door lock device 17 and the code for opening the trunk opening device 18 are different codes from each other. In addition, the door lock W1
Code for operating 7 and trunk open device 1
The code for opening 8 includes information as a vehicle identification code. That is, the code transmitted by the transmitter 1 differs depending on the vehicle.

FIG. 7 is a perspective view depicting the appearance of the transmitter 1 of the present invention. This transmitter 1 is incorporated into an ignition key 20 necessary for starting the engine of a vehicle. The switches SWI and SW2 are incorporated into the key top 21 of the ignition key 20.

FIG. 2 is a block diagram showing the circuit configuration of the receiver 5 of the keyless entry device of the present invention.

The receiver 5 includes a high frequency relay 6. The high frequency relay 6 includes two antennas ANT2. ANT3 is connected. Antenna ANT2 is an omnidirectional antenna.
It uses an FM antenna attached to the rear window of the vehicle.

In addition, the antenna ANT3 is a directional antenna,
Two ferrite bar antennas are fixed inside the vehicle's rear license plate light. If the reception area of the antenna ANT3 does not need to be very wide, there is no particular need for a plurality of ferrite bar antennas. Further, the antenna ANT3 does not particularly need to be a ferrite bar antenna.

FIG. 4 shows the reception area of antenna ANT2.

The antenna ANT2 has a uniform reception area A around the vehicle 19.

FIG. 5 shows the reception area of antenna ANT3.

The antenna ANT3 has a reception area B behind the vehicle 19,
A reception area C is provided around the vehicle.

FIG. 6 shows a characteristic obtained by combining the directivity of antenna ANT2 and antenna ANT3. The illustrated area A is the antenna AN.
Only T2 is a region having reception sensitivity, and the illustrated regions B and C are regions in which both antennas ANT2 and ANT3 have reception sensitivity.

The receiver a5 is a device that receives a signal of 60 MIIz, and further includes a high frequency amplifier 7, a local oscillator 9, and a mixer 8 that mixes the oscillation output of the local oscillator 9 and the output signal of the high frequency amplifier 7.
, an intermediate frequency amplification circuit 10, and a detection circuit 12.

That is, it constitutes a superheterodyne detection circuit.

Since the superheterodyne detection circuit has already been introduced in many documents, a detailed explanation will be omitted.

A waveform shaping circuit 13 is connected to the detection circuit 12 . The waveform shaping circuit 13 is a circuit that constitutes an input interface of the electronic control unit 14, and removes noise components contained in the output signal of the detection circuit 13, binarizes the signal detected by the detection circuit 13, and shapes it into a rectangular wave. . The shaped rectangular wave becomes a signal corresponding to the code generated by the code generating means 2 of the transmitter 1.

Further, the intermediate frequency amplification circuit 10 includes an antenna ANT2,
Alternatively, a level detection circuit 11 for detecting the electric field strength received by the antenna ANT3 is connected. Level detection circuit ll detects the reception state of receiver 5. The level detection circuit 11 has a predetermined setting value set therein, and compares the signal field strength received by the antenna ANT2 or the antenna ANT3 with the setting value. Then, the level detection circuit 11 detects the antenna ANT2 or the antenna A.
Whether the electric field strength received by N T 3 is greater than or equal to a set value is outputted to the electronic control unit 14 as binary information.

The electronic control device 14 has a microcomputer and its input/output interface as main components. The electronic control device 14 of this embodiment has an internal timer, and is configured to allow the timer to be set or reset by instructions from a microcomputer. Further, the set time of this timer is set to be longer than the cycle at which the transmitter 1 repeats and transmits a predetermined code.

Furthermore, the electronic control device 14 and the drive circuits 15 and 16 are connected to each other according to instructions from the microcomputer.
It has a standby function that reduces power consumption.

As described above, the output signals of the waveform shaping circuit 13 and the level detection circuit 11 are input to the electronic control device 14. Further, the electronic control device 14 outputs signals for controlling the door lock device drive circuit 15, the trunk open device drive circuit 16, and the high frequency relay 6. That is, the electronic control device 14 controls the antenna ANT2 and the antenna ANT.
3, and also compares the code sent by the transmitter l with the code set inside the electronic control unit 14, and determines whether the door lock device drive circuit 15 or the trunk is open based on the combination of both comparison results. The device drive circuit 16 is selectively driven. The operation of the electronic control unit 14 will be explained later with reference to FIG.

The door lock device drive circuit 15 is a device that reverses the state of the door lock device 17. That is, the door lock device 1
7 has two modes, a lock mode and an unlock mode, and the door lock device drive circuit 15 is a device that alternately switches between these two modes.

The door lock device 17 is a device that locks and unlocks the doors of the vehicle. As mentioned above, the door lock device 17 has two modes: a lock mode and an unlock mode. In other words, the locking mode of the door lock device 17 is a state in which the vehicle door cannot be opened even if the outside handle fixed to the outer wall of the vehicle door or the inside handle fixed to the inner wall of the vehicle door is operated. Conversely, unlock mode refers to the state in which the vehicle door opens when the outside handle or inside handle is operated.

The trunk opening device drive circuit 16 is a device for putting the trunk opening device 18 into an unlock mode.

The trunk opening device 18 is a device for locking the trunk of a vehicle, and automatically enters a locking mode when the trunk is closed.

That is, the trunk opening device 18 normally enters the locking mode when the trunk is closed, and conversely opens the trunk unconditionally when the trunk opening device driving circuit 16 sets the trunk to the unlocking mode.

High frequency relay 6 is antenna ANT2 and antenna ANT3
This is a switching means for selectively connecting the high frequency amplifier circuit 7 to the high frequency amplifier circuit 7. That is, the high frequency relay 6 is connected to the electronic control device 14.
This is a device that selects an antenna to be connected to the high frequency amplification circuit 7 based on instructions from the user.

When switch SWI or switch SW2 of transmitter 1 is operated, a predetermined code is modulated and transmitted from transmitter 1. The transmitted code is sent to the antenna AN of the receiver 5.
T2. Received by ANT3. antenna ANT2
．． The signal received by the ANT 3 is demodulated by superheterodyne detection circuits from the high frequency amplifier circuit 7 to the detection circuit 12, shaped into a rectangular wave by the waveform shaping circuit 13, and input to the electronic control unit 14.

On the other hand, the antenna ANT2 of the receiver 5. The reception state of the signal received by the ANT 3 is determined by the level detection circuit 11 and input to the electronic control device 14 .

The electronic control device 14 controls the high frequency relay 6, the door lock device drive circuit 15, and the trunk open device drive circuit 16 based on the code input from the waveform shaping circuit 13 and the reception state input by the level detection circuit 11. do.

A control flow of the electronic control device 14 is shown in FIG.

When the electronic control unit 14 is powered on, initialization processing is executed. The initialization process includes initial settings of the microcomputer, initial settings of the input/output interface, initial settings of the high frequency relay 6 (connecting the antenna ANT2 and the high frequency amplifier circuit 7), and initial settings of the door lock device drive circuit 15 (initial settings for the lock mode). setting), initial setting of the trunk open device drive circuit 16 (setting to lock mode), etc.

After this initialization process, the control flow SO shown in FIG. 3 is started.

When the control flow SO is started, standby mode is first set in step S1. What is standby mode?
High frequency relay 6, antenna ANT2 and high frequency amplification circuit 7
This is a mode in which the standby function of the electronic control unit 14 described above is operated. That is, the electronic control device 14
When the controller executes step S1, the power consumption of the electronic control B device 14 and the drive circuits 15 and 16 is reduced.

Once the electronic control device 14 executes step S1,
This state is maintained until switch SWI or switch SW2 of transmitter l is operated. That is, the electronic control device 14 stops while preserving the state in which step S1 has been executed, and continues to stop until a signal is input to the electronic control device 14 from the level detection circuit 11 described above.

Steps S2 and S3 are a flow for determining the reception state of the antenna ANT2. That is, step S2 and step S3 are part of the first comparison and determination means. The first comparison judgment means performs step 32. Step S6, which is referred to as S3. It consists of S7.

Step S2 is a flow for switching the high frequency relay 6 mentioned above. That is, omnidirectional antenna ANT
2 and a high frequency amplification circuit 7 are connected.

In step S3, it is determined whether the reception state of the antenna ANT2 is good. That is, step S
In step 3, it is determined whether the signal from the level detection circuit 11 is being input to the electronic control device 14 with the antenna ANT2 and the high frequency amplification circuit 7 connected.

If it is determined that there is no signal input, it is determined that the distance between the transmitter 1 and the receiver 5 is large, and step S is performed again.
Return to 1.

If it is determined that there is a signal input, it is assumed that the distance between the transmitter m1 and the receiver 5 is within a predetermined range, and the process proceeds to step S4.

Step S4 and step S5 are a second comparison/judgment means for determining whether the code transmitted by the transmitter 1 satisfies a predetermined condition.

In step S4, it is first determined whether the transmitted code matches either the code for operating the door lock device 17 or the code for opening the trunk opening device 18.

If it is determined that the transmitted codes do not match, the process returns to step S2 to ignore the received signal.

If it is determined that they match, the process advances to step S5.

In step S5, it is determined whether the transmitted code is a code for operating the door lock device 17.

If it is determined that the transmitted code is the code for the door lock device 17, the process advances to step S11.

If it is determined that the code is not for the door lock device 17, it is determined that the code is for opening the trunk opening device 18, and the process proceeds to step S6.

The processing from step S6 to step SIO is a flow for controlling the trunk open device drive circuit 16.

Further, step S6 and step S7 are performed by the antenna ANT.
This is a flow for determining the reception status of step 3.

That is, step S2 and step S3 are part of the first comparison and determination means.

Step S6 is a flow for switching the high frequency relay 6 mentioned above. That is, the directional antenna A N
T 3 and high frequency amplification circuit 7 are connected.

In step S7, it is determined whether the reception state of the antenna ANT3 is good. That is, step S
At step 7, it is determined whether or not the signal from the level detection circuit 11 is being input to the electronic control device 14 with the antenna ANT3 and the high frequency amplification circuit 2 connected.

If it is determined that there is no signal input, it is determined that the positional relationship between the transmitter 1 and the receiver 5 is not appropriate, and step S2
Return to

If it is determined that there is a signal input, it is determined that the positional relationship between the transmitter 1 and the receiver 5 is appropriate, and step S8
Proceed to.

In step S8, it is determined whether the timer built into the electronic control unit 214 indicates that the set time has elapsed.

If it is determined that the specified time has not passed,
It is determined that the switch SW2 of the transmitter 1 remains operated, and the process proceeds to step S10.

If it is determined that "the predetermined time has elapsed", it is determined that the switch SW2 of the transmitter 1 has been operated, and
Proceed to step S9.

In step S9, the trunk open device drive circuit 16
to open the trunk.

In step S10, the timer built in the electronic control unit 14 is cleared and restarted.

This timer is activated by the trunk open device drive circuit 16 when the switch SW2 of the transmitter 1 continues to be operated.
This is to prevent repeated operations.

After performing the process of step 310, step S2 is performed again.
Go back and process.

The processing from step Sll to step S13 is a flow for controlling the door lock device drive circuit 15.

Step Sll is executed when it is determined that the code transmitted in step S5 is the code for the door lock device 17.

In step Sll, it is determined whether the timer built into the electronic control device 14 indicates that the set time has elapsed.

If it is determined that the specified time has not passed,
It is determined that the switch SWl of the transmitter 1 remains operated, and the process proceeds to step s13.

If it is determined that "the predetermined time has elapsed", it is determined that the switch SW1 of the transmitter 1 has been operated, and
Proceed to step S12.

In step S12, the door lock device drive circuit 15 is operated to reverse the state of the door lock device 17.

In step S13, the timer built in the electronic control unit 14 is cleared and restarted.

This timer is provided to prevent the door lock device drive circuit 15 from operating repeatedly if the switch SWI of the transmitter 1 continues to be operated.

After performing the process in step S13, step S2 is performed again.
Go back and process.

As described above, according to the control flow SO of this embodiment, in the area B or C shown in FIG.
However, in the region A, the trunk open device drive circuit 16 cannot be operated.

Therefore, in order to operate the trunk open device 18, the transmitter 1 must be moved to area B or C. Therefore, even if the switch SW2 is operated by mistake, if the transmitter 1 is not in the area B or C,
The trunk open device 18 does not malfunction.

In this embodiment, only an example is shown in which the regions B and C in which the trunk opening device 18 can operate are limited, but it is also possible to limit the region in which the door lock device W17 can operate. In that case, changes are made to the control flow so shown in FIG.

In this embodiment, only an example was shown in which the code for operating the door lock device 17 and the code for operating the trunk open device 18 are different, but in the keyless entry device of the present invention, both codes are the same code. Good too. In that case, the control flow SO shown in FIG.
The area where the door lock device 17 can be operated and the area where the trunk open device 18 can be operated are made independent.

In addition, in this embodiment, the door lock device 17 and the trunk opening device 18 are shown as the objects to be controlled by the keyless entry device, but other control objects such as setting or canceling an anti-theft device may also be used. It can also be used for

〔Effect of the invention〕

The present invention operates by selecting the locking/unlocking means depending on the difference in the reception status of a plurality of receiving means or depending on whether a code transmitted by a switch operation of the transmitting means matches a setting code set in the receiving means. It is something that makes you

Therefore, it is possible to construct a keyless entry device in which the door, trunk, etc. do not open if the switch of the transmitting means is operated by mistake.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the circuit configuration of a transmitter 1 of a keyless entry device of the present invention. FIG. 2 is a block diagram showing the circuit configuration of the receiver 5 of the keyless entry device of the present invention. FIG. 3 is a flowchart showing the control flow of the electronic control device of the present invention. FIG. 4 is a plan view showing the receiving area of antenna ANT2, FIG. 5 is a plan view showing the receiving area of antenna ANT3, and FIG.
The figure is a plan view showing the combined characteristics of the reception areas of antenna ANT2 and antenna ANT3. FIG. 7 is a perspective view depicting the external appearance of the transmitter of the present invention. ■...Transmitter (transmission means) 2...Code generation means (storage means) 3...Modulation transmission means (modulation means) 4...Output circuit 5...Receiver (reception means) 6. ... High frequency relay (switching means) 7 ... High frequency amplifier 8 ... Mixer 9 ... Local oscillator 10 ... Intermediate frequency amplification circuit 11 ... Level detection circuit (first comparison means) 12.・
- Detection circuit 13...Waveform shaping circuit 14...Electronic control device (second comparison means, drive means) 15...Door lock device drive circuit 16...Trunk open device drive circuit 17...Door Lock device (locking/unlocking means) 18...Trunk opening device (locking/unlocking means) 19...Vehicle 20...Ignition key 21...Key top ANTl...Antenna ANT2...Antenna (multiple reception means, first antenna) ANT3... antenna (multiple receiving means, second antenna)

Claims (4)

[Claims] (1) A portable transmitting means for transmitting a predetermined code; at least one locking/unlocking means; a plurality of receiving means for receiving signals from the transmitting means; a first comparing and determining means for determining the receiving state of the receiving means; a second comparing and determining means connected to at least one of the plurality of receiving means and for determining the code transmitted by the transmitting means; and a drive means for selectively driving the at least one locking/unlocking means by determining a combination of the outputs of the second comparison and determination means. (2) The transmitting means further includes a storage means for storing at least two codes, a selection means for selecting one code from the at least two codes stored by the storage means, and is connected to the selection means, and 2. The keyless keyless keyless keyless keyless communication system according to claim 1, further comprising a modulating means for modulating and transmitting one code, and selecting and transmitting one of the at least two codes. Entry device. (3) The plurality of receiving means includes: a first omnidirectional antenna; a second antenna having directivity; and the first comparison means includes: The keyless entry device according to claim 1, further comprising: switching means for selecting an antenna and connecting it to the detection means. (4) A patent claim characterized in that the locking/unlocking means further includes: a door locking device that controls locking/unlocking of a door of the vehicle; and a trunk locking device that controls locking/unlocking of a trunk of the vehicle. The keyless entry device according to item 1.