JPS61266784A - Wireless type unlocking controller - 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] (Industrial application field) The present invention relates to a wireless unlocking control device for a vehicle.

(Prior art and its problems) As a conventional wireless unlocking control device, for example,
The one described in JP-A-24075 is known.

With this device, as long as you have a portable device in your chest pocket or in your bag, you can unlock the vehicle door by simply pressing the transmission request switch mounted near the door handle with your fingertip. The unlocking operation was significantly easier than the conventional method of inserting a key into a key hole and rotating it.

On the other hand, if the mobile device is left behind in the vehicle, the in-vehicle device and the mobile device can constantly communicate wirelessly, so anyone can easily open the door by simply operating the transmission request switch, even if they do not have the mobile device. It was possible to unlock the door, which was considered a theft prevention problem.

Therefore, in Japanese Patent Application No. 59-14698, etc., the present applicant has previously proposed that the driver's seat can be used to get off the vehicle based on the output of a switch that confirms that the driver's door is opened, a switch that confirms that the driver's door is locked, etc. The movement of the mobile phone is estimated, and based on whether the change in the received electric field level from the mobile phone at this time exceeds a predetermined threshold corresponding to when the mobile phone is moving, it is determined whether the mobile phone has been left behind in the vehicle. An application has been filed (unpublished) for a device designed to determine this.

However, in this device, the threshold value for determining whether something has been left behind is always fixed at a constant value, so it is difficult to use a portable device inside the vehicle in a high-noise environment such as next to train tracks or at a substation. If a device is left behind, the range of change in the received electric field strength due to the M sound will exceed a predetermined threshold, even though the mobile device does not move when getting off the vehicle, and the misplacement determination process will not function properly. I could think of a case.

(Objective of the Invention) The object of the present invention is to provide a wireless system that can reliably detect whether a portable device has been left behind in a conductor in a high-noise environment such as on the side of train tracks or at a substation. An object of the present invention is to provide an unlocking control device.

(Structure of the Invention) The present invention will be described in detail with reference to the claim correspondence diagram in FIG.

In the same figure, the start time detection means a detects the start time of the period during which the vehicle is estimated to be getting off the vehicle.

The noise level record means stores the noise electric field level immediately after the detected start time.

The reference level storage means C stores the electric field level received from the portable device d immediately after the detected start time as the reference electric field level.

The misplacement determination means e determines that the difference between the received electric field level from the portable device received during the period during which the vehicle is estimated to be in the process of getting off the vehicle and the stored reference electric field level is the difference between the stored noise electric field level and the reference electric field level. It is determined that the portable device d has been left behind in the vehicle based on the fact that the predetermined threshold value determined using the parameter d has been exceeded.

(Explanation of Examples) Fig. 2 is a perspective view showing the relationship between the on-vehicle device and the portable device, Fig. 3 is a diagram showing the hardware configuration of the portable device, and Fig. 4 does not show the hardware configuration of the on-vehicle device. FIG. 5 is a flowchart showing a system program executed by the in-vehicle device and the portable device.

The device of the present invention includes an on-vehicle device that is mounted on the vehicle side and a portable device that the vehicle user must carry.

As shown in Figure 2, the components of the on-vehicle device include the vehicle 1
The main unit 2 is stored under the driver's seat, etc., and the driver's door 3. A pair of loop antennas 5a are provided corresponding to the trunk lid 4, respectively.

6b or 13c, CD, send request switch 5
It consists of

In FIG. 2, a transmission request switch 5 and a pair of loop antennas 6a correspond to the driver's door.

Only 6b is shown as a representative.

In this case, the transmission request switch 5 is attached near the door handle 7 of the driver's door 3, one loop antenna 6a is attached to the back of the driver's seat, and the other loop antenna 6b is attached to the inner periphery of the door mirror 8. It is fitted along.

Furthermore, the portable device 9 has a thin rectangular plastic case that is convenient for storage in a breast pocket or bag, and a transmitting/receiving loop antenna and a circuit board are built into the case.

That is, as shown in FIG. 3, the portable device 9 includes a loop antenna 91 for transmitting and receiving, and a receiving/demodulating circuit 92 that receives and demodulates the transmission request command from the high frequency captured by the loop antenna 91. , a unique code storage section 93 that stores the unique code of the portable device, and a modulation circuit 94 for wirelessly transmitting the unique code read from the unique code storage section 93 to the vehicle-mounted device. carrier oscillation circuit 95;
It is comprised of a microcomputer 96 that centrally controls the entire portable device.

On the other hand, as shown in FIG. 4, the main unit 2 on the in-vehicle device side has a CPU 201 having a microcomputer configuration as its center.
The CPU 201 includes a microprocessor unit, an interface circuit, and a memory (
(ROM, RAM, etc.) and a timer.

Antennas 5c and (3d are loop antennas installed near the trunk of the vehicle body, and both are arranged at a predetermined interval.

The other pair of loop antennas 6a and 6b are arranged near the driver's side door.As mentioned above, one loop antenna 6b is placed inside the mirror frame of the driver's side door mirror, and the other loop antenna 6a is placed near the driver's side door mirror. It is placed on the seat side window glass.

Corresponding to the loop antennas 6a, b, c, and d, push-button switches (hereinafter referred to as transmission request switches>5.10 are installed near the door handle of the driver's side door and at predetermined positions on the outside of the trunk, respectively). ing.

one antenna 6a of each of the two pairs of loop antennas;
5c is connected to 90' phase shifters 202 and 203, whereby the transmitted signal and the received signal are phase-shifted by 900, and so-called phase synthesis is performed.

The switching circuits 204 and 205 are output from the CPU 201! ;7) In response to the exchange @SI, the antenna pair 6c, 6d on the trunk side or the antenna pair 6a, 6 on the driver's seat side
This is an analog switch circuit that activates one of the antenna pairs shown in FIG.

The A/D converter 206 inputs the received signal received by the antenna 6a attached to the driver's seat via the high frequency amplifier 207, converts the level of this input signal into digital data, and converts the level of the input signal into digital data. is supplied to the CPU 201 as received signal strength data Rf. Moreover, this A/D conversion operation is performed by the CPU 20.
The process is executed in response to the arrival of the trigger signal S2 supplied from 1.

The door switch 11 is for detecting the opening/opening state of the driver's side door, and is turned on between the doors.

It is turned off between doors.

Similarly, the door switch 12 is a switch for detecting the open/closed state of the passenger door and the two rear doors (in the case of a sedan), and is turned on between the doors and turned off between the doors. .

The key insertion detection switch 13 is a switch for detecting whether or not a key is inserted into the key cylinder of an ignition key switch that is not in operation, and is turned ON when a key is inserted into the key cylinder. is.

The lock knob switch 14 is a switch that is turned on when the door lock knob provided on the inner surface of the door on the driver's seat side is pushed in to lock the door.

The lock state detection switch 15 is a switch that detects the state of the door lock mechanism, and is turned off when the door lock mechanism is locked, and turned on when the door lock mechanism is unlocked.

The power supply start detection circuit 208 includes each of the switches 5 and 1.
When any one of switches 0 to 15 is turned on (however, switch 11.15 is switched between ON and OFF), it is driven for a predetermined time and power is supplied from the power supply 209 to each circuit. be. Also, CPU201
When the power supply holding signal S3 supplied from
The configuration is such that the power supply is maintained regardless of the ON operation of each of the switches, and the power supply is stopped when the CPU 201 enters the standby state.

The relay 210 is driven when the 1 to rank unlock signal 8Ss is output from the CPU 201 and the 1 range resistor Tr1 is turned on, and drives the trunk lock unlocking solenoid (not shown) to unlock the l/rank lock. It is what makes the lock work.

The relay 211 and the relay 212 each connect to the CPU 201.
Door lock signal S? 1 to transistors Tr2rTr3 are turned ON by the door unlock signal S6.
The relay 211 reverses a motor (not shown) that automatically opens and closes the door lock to lock the door, and the relay 212 rotates the motor in the forward direction to unlock the door. It is something that makes you

The alarm signal S9 output from the CPU 201 is a signal that drives the alarm drive circuit 213 and causes the horn to sound.

Furthermore, the CPU 201 has multiplexers 2 and 4.
The configuration is such that a unique code is input via the .

That is, the multiplexer 214 is provided with an input connector, and all terminals of this connector are open at the time of manufacture.

When this locking control device is sold and handed over to a user, the unique cord plug 16 stored with the portable device 9 is inserted into the connector of the multiplexer 214.

This unique code plug 16 has 4 digits (each digit is 4 digits) corresponding to the unique code stored in the circuit of the portable device 9.
The structure is such that corresponding pins are short-circuited to form code data (expressed in bits).

Such a unique code plug 16 is connected to the multiplexer 21.
4, the multiplexer supplies unique code data to the CPU 201.

Note that 215 is a modulator that modulates the carrier wave from the transmitting circuit 216 with the signal S5 from the CPU 201, and the switching circuit 217
a and amplifiers 220 and 221, and are output from the antennas 6a to 6d.

Further, the signals received by the antennas 6a to 6d are amplified by a high frequency amplifier 218 via a switching circuit 217b, and detected and demodulated by a detection demodulator 219.

The switching circuit 217 is activated by the signal S4 from the CPU 201.
It is controlled so that only one of them is turned on.

Further, the attenuator 223 is activated by a signal S6 from the CPU 201, and attenuates the received signal to lower the reception sensitivity of the vehicle.

Next, the normal operation of this radio key system will be briefly explained with reference to FIG. If the key is later taken out from the ignition switch of the vehicle, the transmission request signal output from the microcomputer 201 is AM-modulated by the operations of the modulator 215 and the transmitter 216, and then sent to the vehicle-side loop coil as a CW wave. 6a, 6b to the portable device 9 side using the induced electromagnetic field (fifth
Figure steps 100, 101>.

Then, on the mobile device 9 side, there are 9 loop coils.

detecting the Rifnis 1- signal via the reception demodulation circuit 92;
In response to this, the microcomputer 96 operates and transfers the unique code read from the unique code storage section 93 to the modulation circuit 94. The signal is AM-modulated by the operation of the carrier transmitter circuit 95 and sent back to the on-vehicle device using the induced electromagnetic field from the loop coil 91 (Steps 200, 201, 202, 2 in Fig. 5).
03>.

Next, on the in-vehicle device side, the loop coils 6a, 6b and the detection/demodulator 219 receive the unique code, and compare this with the unique code read from the unique code flag 16 to determine whether the user is a pre-registered user or not. (steps 102, 103 and 104 in FIG. 5).

Here, when it is determined that the unique codes match, the actuator for the door lock is driven via the actuator drive relays 211 and 212, and the door is unlocked or locked (Steps 105 and 106 in FIG. 5). ,10
7>.

As a result, vehicle users are conveniently able to freely lock or unlock the doors by simply carrying the portable device 4 in their breast pocket, bag, etc., without any special key operations. .

Next, the misplacement process will be described with reference to FIGS. 6 to 8.

The process shown in FIG. 6 involves locking the driver's door (switch 15
(detected by ) and is executed by interrupt processing. That is,
Immediately after the misplacement process starts, the noise electric field level v
- are measured (step 300), and the obtained noise electric field level VN is stored at a predetermined location in the memory.

Next, a request command for sending a misplacement check signal is wirelessly transmitted to the portable device 9 (step 301).
. Then, on the portable device 9 side, as shown in FIG.
Wirelessly sends the unmodulated signal, ie CW, back to the in-vehicle device (
FIG. 5 step 204).

On the other hand, after the in-vehicle device wirelessly transmits the misplaced request command, it enters a predetermined standby process, and when the portable device wirelessly returns an unmodulated signal for misplacement check, the received electric field level is set as the reference electric field level VM. measure,
Store this in a predetermined location in memory (step 302)
.

Next, the obtained noise electric field level N and reference electric field level V
Using M as a parameter, a threshold value vth for misplacement determination is determined by the following equation (step 303).

However, Vth(HIM) = 'l, 5dBμV
Let th(HAX)=6clBμ.

First, the ratio of VN to the signal Vg is V l4 - V
N 10 was determined and its rate of change was taken.

Further, 1.5 dBμ is a level that changes at least when the portable device 9 moves, and MAX is determined because it cannot be determined that noise exceeds the signal.

In reality, it is impossible to determine the threshold value yth in such a fine unit as expressed by the above formula, and it is determined by the resolution of the A/D converter, so we will set this resolution to 0.5c.
Assuming that the voltage is 1Bμ and the resolution is changed in units of 1dBμ, the threshold value Vth at this time is as shown in FIG.

Here, as shown in the graph of FIG. 7, the value of the threshold value vth for determining that the portable device 9 has been left behind, that is, for determining that the portable device 9 has been moved, increases as the value of the reference electric field level VM decreases. The value is set so that the value becomes larger as the value of the noise electric field level VN increases.

Next, when the above threshold value determination process is completed, the process of wirelessly transmitting a misplaced request command to the portable device at regular time intervals is repeated, and the received electric field level VI from the portable device 9 is measured each time, It is repeatedly determined whether the absolute value of the deviation between the two exceeds the threshold value Vth (steps 305, 306, 307), and b
If it is determined that the key value vth is not exceeded, the misplacement process ends (No in step 307).

On the other hand, if it is determined that the threshold IflVti+ is exceeded (step 3074), and if it is determined that the threshold value vth is exceeded 10 times in a row (step 301), an alarm output is immediately issued and the vehicle A horn or the like is sounded (step 309), and then the attenuator 223 is driven, and the reception sensitivity of the vehicle-mounted device is significantly reduced (step 310).

Here, the reception sensitivity of the in-vehicle device at this time is such that when the portable device 9 is placed close to or in close contact with the in-vehicle device side loop antenna built into the vehicle door mirror 8, etc., communication between the portable device and the in-vehicle device 9 is barely possible. is set to the extent that it is possible.

Therefore, if you leave your mobile device in the car, even if someone operates the transmission request switch,
Communication between the portable device and the vehicle-mounted device is not possible, so the vehicle door cannot be unlocked.

In this way, in the present invention, the threshold 1 direct vt for misplacement determination is
The value of h was set to increase as the value of the base 2F-electric field level VM decreased, and to increase as the value of the noise electric field level VN increased.

Therefore, as shown in FIGS. 8(a) to (C), if the portable device 9 is left behind in a low-noise environment, depending on the deviation ΔV~ of both electric field levels VM and VI, The value of the threshold value vth also decreases, so that even if ΔVN due to movement of the portable device is small, it is possible to reliably determine whether the portable device has been left behind.

In addition, as shown in Fig. 8 (a') to (C'), if the portable device is left behind in a high noise environment, depending on the deviation △VN- of both electric field levels VN and VI, Since the value of the threshold value vth increases, it is possible to eliminate the influence of noise and reliably determine whether a mobile device has been left behind.

(Effects of the Invention) As is clear from the description of the embodiments above, according to the present invention, regardless of the magnitude of the noise electric field level and the magnitude of the received electric field level, it is possible to determine whether a portable device has been left behind in the vehicle interior without error. This makes it possible to improve the reliability of this type of wireless unlocking control device.

[Brief explanation of drawings]

Fig. 1 is a claim correspondence diagram showing the configuration of the present invention, Fig. 2 is a perspective view showing the relationship between the in-vehicle device and the portable device, Fig. 3 is a block diagram showing the electrical configuration of the portable device, and Fig. 4 5 is a block diagram showing the electrical configuration of the on-vehicle device, FIG. 5 is a flowchart showing the structure of a system program for locking/unlocking control executed in the on-vehicle device and the portable device, and FIG. A flowchart showing the details, FIG. 7 shows the threshold value yth for misplacement determination and the noise electric field level VN
. A graph showing the relationship between the reference electric field level V and FIG. 8 is a waveform diagram showing the waveform of the received signal in a low noise environment and a high noise environment. Total: Start time detection means b: Noise level storage means C: Reference level storage means d: Portable device e: Misplacement determination means

Claims (1)

[Claims] (1) Start time detection means for detecting the start time of a period during which the vehicle is estimated to be in the process of dismounting; Noise level storage means for storing the noise electric field level immediately after the detected start time; Immediately after the detected start time a reference level storage means for storing, as a reference electric field level, an electric field level received from the portable device during the alighting operation; misplacement determining means for determining that the portable device has been left behind in the vehicle interior based on the deviation of the portable device exceeding a predetermined threshold determined using the stored noise electric field level and reference electric field level as parameters; A wireless unlocking control device comprising: