JPS60159269A - Radio transmission system for vehicle - 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 (Field of Industrial Application) The present invention relates to a vehicle wireless transmission system that transmits and receives wireless signals inside and outside a vehicle.

(Background of the Invention) The applicant of the present application previously proposed a "radio wave type key system" in Japanese Patent Application No. 132118/1982 (unpublished). This radio key system is applied, for example, to the door lock of a vehicle; instead of the driver holding the key, he holds a transmitter, and when the person holding the key operates the switch installed on the door, the driver The door is unlocked or locked only when the door is locked.

FIG. 1 is a block diagram showing a schematic configuration of the radio wave type key system (hereinafter referred to as a vehicle locking control device). In the figure, a transmitter 1 is housed in a card-type case, and the card-type transmitter 1 is carried by the driver in place of the mechanical key of the vehicle 18.

On the other hand, a control device 2 is mounted on the vehicle 18 side,
Furthermore, a loop antenna 10 is provided on the window, and a switch is provided near the door handle on the driver's side door.

The card type transmitter 1 is always powered on,
It is in a state where it can receive a request signal transmitted from the control device 2 on the vehicle body side.

When the driver carrying this card-type transmitter 1 manually operates the switch 12 to unlock the door, the request signal generating circuit 11 in the control device 2 is activated as shown in FIG. It operates and transmits a request signal from the loop antenna 10 for a certain period of time. The request signal transmitted from the loop antenna 10 is received by the loop antenna 3 of the card type transmitter 1 by electromagnetic induction. Then, on the card type transmitter 1 side, the request signal detection circuit 7 detects that the request signal has been transmitted to the control device 2 on the vehicle 18 side, and activates the code signal generation circuit 8.

When the code signal generation circuit 8 is activated, it outputs a code signal unique to the vehicle 18 (a different code is set for each vehicle) which has not been previously stored in the code storage circuit 9. Then, in the modulation circuit 5, the carrier signal supplied from the carrier oscillation circuit 6 is modulated by the code signal, and the output circuit 4. Transmit via loop antenna 3.

On the vehicle side, the unique code signal transmitted from the JJ-type transmitter 1 is transmitted to the loop antenna 10.
This received unique code signal is received by
The signal is supplied to the code matching circuit 14 via the receiving/demodulating circuit 13.

The code matching circuit 14 determines whether or not the vehicle-specific code signal registered in advance in the code storage circuit 15 matches the received code signal. The actuator drive circuits 1 and 6 are driven only in certain cases.

Then, when the actuator drive circuit 16 is driven,
The actuator 17 that unlocks and locks the door is driven to unlock the door L'.

In this way, the door lock is unlocked and locked only when the code signal on the card-type transmitter R1 side and the code signal registered in the control circuit 2 on the vehicle side match. Even if a person who does not have the transmitter 1 tries to unlock the door, the door will not be unlocked. Further, even if a person carrying a card type transmitter 1 with a different code signal attempts to unlock the door, the door lock will not be unlocked in the same way. As a result, the card type transmitter 1 has the same security performance as a conventional mechanical key.

In addition, the card-type transmitter 1 can be used while stored in a pocket or bag, so there is no need to take out the key every time you unlock or lock the door, unlike conventional mechanical keys. This can be omitted.

The actuator 17 is configured to reverse the door lock state each time the actuator is driven, and if the door lock is locked before driving, it will unlock the door, and if the door lock is unlocked before driving. If so, perform the locking operation.

By the way, if the vehicle locking control device as described above is further developed, it may be possible to apply it not only to door locks but also to other locking mechanisms such as trunk locks, ignition switches, steering locks, etc. In such a case, it becomes necessary to increase the number of antennas correspondingly.

If the number of antennas is increased in this way, it becomes necessary to check whether each antenna is operating normally on the production line or during maintenance.

For this reason, time and man-hours increase on the production line, and maintenance may also be troublesome.

(Object of the Invention) An object of the present invention is to provide a wireless transmission system for a vehicle that allows checking of a device having a large number of antennas easily and in a short time.

(Structure of the invention) Hereinafter, the configuration of the present invention will be explained using FIG. 3.

The portable device 100 transmits and receives wireless signals to and from the vehicle body device 101.

The vehicle body device 101 is mounted on a vehicle and transmits and receives wireless signals via an antenna 102 provided at a predetermined portion of the vehicle body.

Then, the vehicle body device 101 has a reference value set based on the received signal 1q when the system consisting of the vehicle body device 101 and the mobile phone 100 is normal and the mobile device is brought into close contact with the antenna 102. Reference value generating means 104, J3 that generates the reference value, and abnormality determining means 103 that determines an abnormality in the system by comparing the received signal obtained through the antenna 102 with the reference value are provided.

(Description of Embodiment) FIG. 4 is a block diagram showing the configuration of a card-type transmitter in an embodiment of the vehicle locking control device according to the present invention.
The figure is a circuit diagram showing the configuration of a control device similarly provided on the vehicle body side.

The one-card transmitter 30 shown in FIG. 4 is housed in a thin card-shaped case about the size of a business card, similar to the conventional example shown in FIG. It is something that you carry with you like a formula key.

The electrical configuration of the card type transmitter 1130 includes a loop antenna 31, a receiving/demodulating circuit 32 for detecting a request signal, a microcomputer 33, and a memory 34 for storing a unique code. It is generally composed of a carrier oscillation circuit 36 and a modulation circuit 35, which also transmit a unique code signal.

On the other hand, a control device 40 as shown in FIG. 5 is mounted on the vehicle body side. This control device 40 is mainly configured with a microcomputer (hereinafter referred to as CPU) 53, and this CPLJ 53 includes a microprocessor unit, an I10 interface circuit, a memory (RO
(M, RAM, etc.) and a timer.

The antennas 41a and 41b are loop antennas installed near the trunk lock of the trunk of the vehicle body, and are spaced apart from each other by a predetermined distance.

Another set of loop antennas 41C, 4, 1dLt are arranged near the driver's side door, one loop antenna 41C is inside the mirror frame of the driver's side door mirror, and the other loop antenna 41d is on the driver's seat. located within.

Corresponding to the loop antennas 41a to 41d, push button switches (hereinafter referred to as starting switches) 62 and 63 are mounted at predetermined positions on the outer surface of the driver's side door and trunk.

One antenna 41b of each of the two pairs of loop antennas
, 41(I) are connected to 90° phase shifters 42, 43, whereby the transmitting signal and the receiving signal are phase-shifted by 90'.

The switching circuits 46a and 46b respond to the switching signal S+ output from the CPU 53 to switch between the antenna pair +1 on the trunk side.
1a, , 41b or antenna pair 41c on one side of operation,
The A/D converter 47, which is an analog switch circuit that activates one of the antenna pairs 41d, connects the output of the switching circuit 46b, that is, the antenna i on the driver's seat side.
]41 C, = 11d or trunk side antenna pair 41a.

41b;
The level of this input signal is converted into digital data, and this digital data is supplied to the CPU 53 as received signal strength data Rf.

Further, this A/D conversion operation is executed in response to the arrival of the trigger signal $2 supplied from the CPU 53. - The door switch 57 is for detecting the closed door/closed state of the driver's side door, and is ON between the doors.

There are some that turn off between doors.

Similarly, the door switch 58 is a switch that detects the open/closed state of the passenger door and the two rear doors (in the case of a sedan), and is ON between the doors and OFF between the doors. .

The key switch 59 is a switch for detecting whether or not a key is inserted into the key cylinder of an ignition key switch in the driver's cab, and is turned on when the key is inserted into the key cylinder.

The lock knob switch 60 is a switch that is turned on when the door lock knob provided on the inner surface of the driver's seat side door is pushed in to lock the door.

The lock state detection switch 61 is a switch that detects the state of the door lock mechanism, and is turned OFF when the door lock mechanism is in the locked state, and turned ON when the door lock mechanism is in the unlocked state.

The power start detection circuit 54 includes each of the switches 57 to 6.
If any one of 3 is turned on (however, switches 57 and 61 are turned on.

It is driven for a predetermined period of time (when switching OFF), and power is supplied from the power supply 55 to each circuit. Also, C
When the power supply holding signal S3 supplied from the PU 53 arrives, the power supply is maintained regardless of the operation of each of the switches, and the power supply is stopped when the CPU 53 enters the standby state. .

The relay 65 is driven when the trunk unlock signal S8 is output from the CPU 53 and the transistor Tr+ is turned on, and the relay 65 is driven by the trunk unlocking solenoid (
(not shown) to unlock the trunk.

Relay 66 and relay 67 receive door lock signal @S7 and door unlock signal @ output from CPU 53, respectively.
Transistor Tr2 by S6.

It is driven by turning on Tr3, and the relay 67 rotates a motor (not shown) that automatically opens and opens the door lock in the forward direction to unlock the door, and the relay 66 rotates the motor in the reverse direction to lock the door. This is to lock the door.

The buzzer drive signal 89 outputted from the CPU 53 is a signal for driving the buzzer drive circuit 68 and driving the buzzer set at a predetermined position.

Furthermore, the configuration is such that unique codes are input from the CPU 53 via six multiplexers.

Of course, the six multiplexers are provided with input connectors, and the terminals of these connectors are all open at the time of manufacture.

When this locking control device is sold and handed over to a user, the unique code plug 7o stored together with the card type transmitter 30 is inserted into the connectors of the six multiplexers.

This unique code plug 70 corresponds to L to form code data of 4 digits (each digit is represented by 4 bits) to correspond to the unique code stored in the circuit of the card type transmitter 30. It has a structure in which the pins are shorted.

Such a unique code plug 70 is used as a multiplexer 09.
By connecting the multiplexer to the connector, unique code data is supplied to the CPU 53 from the multiplexer.

Next, a flowchart shown in FIG. 6 is a flowchart showing the contents of processing executed by the CPU 53 in the vehicle body side control device 40, and FIG. 3 is a flowchart showing the contents of processing executed in the process.

The operation will be described below, taking as an example the operation when the vehicle stops and the driver gets out of the vehicle and attempts to lock each door.

The only operation required by the driver is to manually operate the start switch 62 provided on the driver's seat door.

When the above-mentioned - switch 62 is turned on, the interrupt processing associated with the turning on of the start switch shown in FIG. 6 is executed accordingly.

When this interrupt process is executed, first, in step 201, it is determined whether the key switch 59 is OFF, that is, the ignition key is removed,
If it is determined that the key is still inserted,
The interrupt processing in the figure is not executed.

On the other hand, if the ignition key has been removed, the process of step 202 is executed to transmit a request signal.

This request signal output processing includes a request code signal @S5 and a switching signal Sl,
This is the process of outputting 84.

The request code signal S5 is stored in the upper 8 bits of the unique code stored in the unique code plug, and is read through the multiplexer 69 and formed in response to the read request code. This is a serial pulse train signal.

As a result, the carrier wave generated from the oscillator 50 is modulated by the request code signal S5 in the modulator 49, and the modulated request signal is transmitted to the switching circuit 46.
a. Loop antenna 41 via "high frequency amplifier 451"
The request signal is wirelessly transmitted by supplying the request signal to the terminals c and 41d.

Once the request signal has been transmitted, the next step 203 is to wait for the key code signal transmitted from the cart type transmitter 30 to be received.

At this time, the above-mentioned node type transmitter side receives the request signal as the request signal is transmitted from the vehicle body side, and the determination result in step 301 in FIG. 7 becomes YES, and step 302 processing is executed.

As a result, a vehicle-specific code signal (hereinafter referred to as a card-side key code) stored in advance in the memory 34 is read into the microcomputer 33, and a serial pulse train signal corresponding to this key code is supplied to the modulation circuit 35. processing is performed.

Therefore, the loop antenna 31 of the card type transmitter 30 transmits a wireless signal carrying the key code signal. .

In this way, when the key code signal is transmitted from the card type transmitter 30, this key code signal is received in the vehicle body control device 40, and the step 203 described above is performed.
The processing result becomes YES, and the processing of step 204 is performed.

In the process of step 204, the card-side key codes that are sequentially received are read and sequentially stored in a predetermined register.

In the key code sent from the card side, a level detection bit B3 is provided at the end of the 16-bit key code bit B2. Further, B1 is a marker bit for notifying that key code bit B2 is started.

Therefore, when the key code bit B2 is read to J- in the process of step 204, the process of step 7205 is executed, and the trigger signal s2 is outputted to the inverter 47. Execute A/D conversion operation.

As a result, the reception signal of the level detection bit that is received this time is input to the Δ/D converter 47, and its reception strength level Rf is read into the CP LJ 53.

Next, when the process of step 206 is executed, the lower 16 bits of the unique code stored in the unique code plug 7o, that is, the key code (hereinafter referred to as the vehicle side A key code) is read, and this vehicle-side key code is compared with the received card-side key code.

Then, in the process of the next step 207, it is determined whether or not the card side key code and the vehicle body side key code match, and if they match, then the process of step 208 is executed, and the current driver's seat A process is performed to determine whether the door is locked. This is done by determining whether the lock state detection switch 61 is in the OF position.

Since the driver is now trying to lock the doors, the driver's door is unlocked, so the process of step 210 is executed next to lock all the doors. It will be done.

The operation at this time is that the door lock signal S7 is output from the CPU 53, the relay switch 666 is driven,
This causes the door lock motor of the driver's seat door to rotate in reverse to lock the door.

At this time, an automatic door lotter device (not shown)
When the driver's door lock is locked, all other door locks are also locked.

When all the doors are locked, the process of step 211 is executed to determine whether the received signal strength Rf read in step 205 is equal to or higher than the preset reference value R3. It will be done.

This reference value R5 is determined in this embodiment, and when the vehicle locking control device is in a normal state, the card type transmitter 1130 is brought into close contact with any of the loop antennas 41a to 41d on the vehicle body side to operate the device. This corresponds to the received signal strength of the level detection pins 1 to B3 in the case of
It is stored in the memory of 3.

Now, if the driver has the card-type transmitter stored in a bag or a bag, the card-type transmitter 30
exists at a certain distance from the loop antenna on the vehicle body side, and the received signal strength Rf is always equal to the reference value Rs.
The following is true.

Therefore, in this case, the determination result in step 211 is N
0, and the interrupt processing shown in the figure ends.

For example, if the driver attempts to get into the vehicle with all the doors locked and attempts to unlock the driver's side door, the driver's door will be unlocked.
ONI of the activated start switch 62! When the operation is performed, the interrupt process shown in FIG. is executed, and the driver's door is unlocked.

To lock and unlock the trunk, the driver turns on the activation switch 63 provided near the trunk lid.
By performing the operation, activation and locking/unlocking are performed in the same manner as the operations related to the door lock described above, and since these operations and flowcharts are the same, illustration and description thereof will be omitted.

Next, on the production line or during maintenance,
A case will be described in which the operation of the apparatus of this embodiment is checked.

In this case, when the card type transmitter 3o is brought into close contact with any of the vehicle body side loop antennas 41a to 41d, and the loop antenna 41a or 41b is brought into close contact with the loop antenna 41a or 41b, the activation switch 63 is When it is placed in close contact with 41C or 41d, it is sufficient to turn on the start switch 62.

The activation switch 62. With the ON operation of '63, the interrupt processing shown in FIG. 6 is also started, and steps 201 to 2
Step 11 is executed, and since the received signal strength Rf is equal to or greater than the reference value R3, the determination result is YES, and the next step 212 is executed. , CPU, 53 outputs a buzzer drive signal s9, generating a buzzer sound. This buzzer sound is stopped after being generated for a predetermined period of time (for example, one second).

In this way, if the buzzer sound is generated by operating the activation switch while the card type transmitter 4E Iff 30 is in close contact with the loop antenna on the car body side, the card type transmitter 30 and the car body side control device 40 etc. It can be seen that the entire system is operating normally.

On the other hand, if any abnormality occurs, the received signal strength Rf will be below the reference value RsLJ, and the buzzer will not sound, indicating that there is an abnormality in the system. I understand.

As described above, the reason why the received signal strength Rf does not exceed the reference value R8 even when the card type transmitter 30 is in close contact with the loop antennas 41a to 4.16 is that the card type transmitter 30 side There may be an abnormality, such as a wire breakage or the carrier frequency being outside the specified range.

In other words, since the received signal input to the A/D converter 47 is a tuned loop antenna, the loop antennas 41a to 41 (1 is a tuned loop antenna) receive a signal that deviates from the specified resonant frequency. In this case, the sensitivity decreases and the received signal strength Rf becomes equal to or lower than the reference value R8.

In addition, it is also conceivable that the power supply voltage of the card-type transmitter 30 has decreased and the transmission signal strength itself has decreased.

Furthermore, if the buzzer sound does not occur only when the card type transmitter 30 is brought into close contact with a specific loop antenna by sequentially changing the antennas that the card type transmitter 30 is brought into close contact with and performing the same operation, it is possible to determine that there is an abnormality in that loop antenna. It can be determined that this is occurring.

(Effects of the Invention) As explained in detail above, in the vehicle wireless transmission system of the present invention, system abnormality diagnosis can be performed with the simple operation of bringing the portable device into close contact with the antenna of the vehicle body device. Therefore, checking on the production line or checking during maintenance can be carried out extremely easily and in a short time.

Furthermore, since a particularly complicated configuration is not required, there is no loss-up, and an inexpensive device can be provided.

Further, this J:Umu vehicle wireless transmission system can be provided as a device suitable for a vehicle locking control device as shown in the above embodiment.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of a vehicle locking control device according to the prior application, FIG. 2 is a diagram showing the external appearance of the same device and how it is mounted on a vehicle, and FIG. 3 is a diagram showing the configuration of the present invention. A block diagram, FIG. 4 is a block diagram showing an electrical configuration of a card-type transmitter according to an embodiment of the present invention, and FIG. 5 is a block diagram showing an electrical configuration of a vehicle side illumination device in the same embodiment. A circuit diagram, FIG. 6 is a flowchart showing the contents of the processing executed in the vehicle body side control device of the same embodiment device, and FIG. 7 is a flowchart showing the contents of the processing executed in the card type transmitter of the same embodiment device. , FIG. 8 is a waveform diagram showing the structure of a signal transmitted from the card type transmitter in the same embodiment device. 100...Portable device 101...Vehicle body side device 102...Antenna 103...Abnormality determination means 104...Reference value generation means 30...・・・・・・・・・・・・・・・ Card type transmitter 40 ・・・・・・・・・・・・・・・ Vehicle side control device 33.53... ... Microcomputer 418-41d ... Loop antenna Patent applicant Nissan Motor Co., Ltd. Figure 6 Figure 7 Figure 8 [3, 8, 111

Claims (1)

[Claims] (1) A vehicle-side device that is mounted on a vehicle and transmits and receives wireless signals via an antenna installed in a predetermined part of the vehicle; and a portable device that transmits and receives wireless signals with the vehicle-side device. ; When the system consisting of the vehicle body side device and the portable device is normal and the portable device is brought into close contact with the antenna, the iq
a reference value generating means for generating a reference value set based on a received signal obtained through the antenna; and an abnormality determining means for determining an abnormality in the system by comparing a received signal obtained through the antenna with the reference value. A vehicle wireless transmission system characterized by: