JPH0470469B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electronic locking device for unlocking various types of locks such as door locks, trunk locks, and steering locks of automobiles using radio waves.

[Prior art]

2. Description of the Related Art Devices for unlocking various types of locks using radio waves have been conventionally known. In other words, a coded signal is modulated at high frequency from the transmitter owned by the owner and transmitted from the antenna, and the coded signal received and demodulated by the receiver, that is, the car's receiver, is sent to the receiver in advance. It is determined whether the code matches the code set in , and the lock is unlocked when the code matches.

[Problems with conventional technology]

By the way, in the above-described technology, it was not possible to issue an alarm when the lock was illegally unlocked due to theft or the like. In other words, when the lock is unlocked, it is difficult to determine whether the lock was unlocked by legitimate wireless communication or by unauthorized means (picking).

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to keep the alarm circuit in operation at all times, and only when the vehicle receives a signal from the transmitter owned by the owner. To provide an electronic lock device in which the alarm circuit is made inactive and the alarm circuit is activated when unlocking with any other key.

[Embodiments of the invention]

Figure 1 shows the transmitter owned by the owner, Figure 2 shows the receiving circuit and control circuit on the vehicle side.
In the figure, numerals 1 to 3 are a door switch for opening a door, a trunk switch for opening a trunk, and a steering switch for unlocking a steering lock. 4 to 6 are numbers of a desired number of digits corresponding to the closed switch 4 (for example, 4 digits "1", "2", "3", "4" or "2","3
”,
“4”, “1” or “3”, “4”, “1”, “2”
”
This is a fixed number generation circuit that sends out a fixed number corresponding to a serial number as a serial signal. 7 is an OR gate that outputs the output to the next stage modulation circuit 9 when the output of the fixed number generation circuits 4 to 6 is input; 8 is a high-frequency oscillation circuit for transmitting the signal from the OR gate 7 as a radio wave; 9 is a high-frequency oscillation circuit; A modulation circuit modulates the signal from the OR gate 7 with a high frequency signal from the high frequency oscillation circuit, 10 is a high frequency amplification circuit that amplifies the modulated signal from the modulation circuit 9, and its output is transmitted into the air from an antenna 11. Ru.

Next, to explain the block diagram in Figure 2,
12 is an antenna provided on the vehicle side; 13 is a tuning circuit that selects and receives radio waves from the owner's transmitter that are incident through the antenna 12; and 14 is a tuning circuit that demodulates the signal from the tuning circuit 13 and outputs a fixed number. a demodulation circuit for obtaining a frequency signal (pulse signal), 15 a low frequency amplification circuit for amplifying the fixed number signal obtained by the demodulation circuit 14, and 16 a low frequency amplification circuit 15;
The number of digits of the fixed number sent by (in this example,
A counting circuit 17 counts a fixed number signal (for example, "1") from the low frequency amplification circuit 15. , "2", "3", "4"), and 18 to 20 are input number recording circuits that record input numbers 18 to 20 when the counting circuit 16 counts a predetermined number of digits (4 digits in this embodiment) and sends out an output. , a fixed number storage circuit whose output outputs a fixed number that matches the predetermined fixed number generation circuits 4 to 6; 21 to 23 are outputs from the input number storage circuit 17 and the fixed number storage circuit 18;
Comparison circuit 24 compares the outputs from the counting circuits 1 to 20 and sends out the respective outputs when they match.
25 is an OR gate that sends out an output when any of the outputs of the comparison circuits 21 to 23 is input; 26 is the OR gate 25;
The theft prevention state is reset when the output from The alarm circuits 30 to 32 send an output when any of the door lock switch 27, which turns on when the trunk cover is opened, the trunk cover lock switch 28, which turns on when the hood is opened, and the hood lock switch 29, which turns on when the hood is opened, is turned on. A plunger for a door actuator, a plunger for a trunk actuator, and a plunger for a steering lock actuator are to be unlocked by turning on the switches 1 to 3, and are activated by the outputs of the comparison circuits 21 to 23. You will be able to open doors, open the trunk cover, and turn the steering wheel. Note that 33 is a delay circuit that sends out an output for a certain period of time (for example, 30 seconds) when the outputs from the comparison circuits 21 to 23 are input.

Next, the operation will be explained with reference to the block diagram.
Now, when the user turns on the door switch 1 provided on the transmitter to get into the car, the fixed number generation circuit 4 generates a door unlock code, for example, 4 digits "1", "2", "3", etc. A fixed number signal of "4" is output as a serial signal. This signal is modulated by a modulation circuit 9 into a high frequency carrier wave generated by a high frequency oscillation circuit 8 via an OR gate 7, and then amplified by a high frequency amplification circuit 10 and sent to an antenna 1.
1 as radio waves.

When this radio wave is input from the antenna 12 on the car side and tuned by the tuning circuit 13, a pulse signal which is a low frequency signal is detected by the detection circuit 14, amplified by the low frequency amplifier circuit 15, and a serial signal is sent to the input number storage circuit 17. The numerical value of the fixed number signal for each digit is stored as , and the number of digits is counted by the counting circuit 16 .

Then, a predetermined number of digits (in this example, 4
When the counting circuit 22 counts the digits, the signals are input to the fixed number storage circuits 18 to 20, and the respective fixed number signals are outputted from the storage circuits 18 to 20 and stored in the input number storage circuit 17. The comparison circuits 21 to 23 compare the numbers.
As a result, when the output of the input number storage circuit 17 and the output of the fixed number storage circuit 18 match, an output is sent from the comparison circuit 21. This energizes the door actuator plunger 30 to unlock the door. Furthermore, since a delay circuit 33 is connected to the output of the comparator circuit 21, the steering lock actuator plunger 32 is also energized during the delay time caused by the delay circuit 33, and the steering lock becomes unlocked.

Furthermore, the alarm circuit 26 is reset by the output from the comparator circuit 21 via the OR gate 25, so that no output is sent out from the alarm circuit 26 and no alarm is issued.

Note that when the signal from the counting circuit 16 is output, a reset signal is output from the reset circuit 24 to the counting circuit 16, and the counting circuit 16 is reset and returns to its initial state.

Also, when the trunk open switch 2 is turned on, the trunk actuator plunger 31 is energized by the same operation as described above.
When the trunk is opened, the steering lock can also be unlocked.

Next, when the door is opened illegally and the door lock switch 27 is closed, the alarm circuit 26 is in the operating state because there is no output from the comparison circuits 21 to 23, so the output from the alarm circuit 26 is sent out. Therefore, the headlamp relay and horn relay are energized to operate the headlamp and horn, and the relay that inhibits starter operation also operates, making it impossible to start the automobile.

Also, if the trunk cover lock switch 28 or the hood lock switch 29 is turned on by unauthorized means, an output is sent from the alarm circuit 26 in the same manner as described above, and the alarm and starter operation are prohibited.

Note that the parts other than the above-mentioned transmitter/receiver can be replaced by a microcomputer.

〔Effect of the invention〕

As described above, in the present invention, when the switch corresponding to the actuator of the owner side transmitter is operated, an unlocking signal from this switch is received on the vehicle side, and the signal is set in advance. When the signal matches the output, the actuator corresponding to the switch operates and opens the door.
Since the trunk cover etc. are unlocked, the number of switches to be operated can be as large as the number of actuators, and therefore there is no need to operate a password using a numeric keypad as in the past, resulting in good operability. Also,
Since the alarm circuit is rendered inactive by the output for driving the actuator, the alarm circuit is activated when the lock is unlocked by a signal other than the unlock signal from the owner's transmitter. Theft due to picking during unauthorized unlocking can be effectively prevented, and since the alarm device is set when the ignition key is removed, it is impossible for the driver to unlock the steering lock or trunk with the ignition key inserted. This has the effect that an alarm will not sound due to malfunction when locking the lock.

[Brief explanation of drawings]

The figures show an example of an electronic lock device according to the present invention, FIG. 1 is a block diagram of an owner's side transmitter, and FIG. 2 is a block diagram showing a vehicle side circuit. 1-3...Switch, 4-6...Fixed number generation circuit, 17...Input number storage circuit, 18-20...
... Fixed number storage circuit, 21 to 23 ... Comparison circuit,
26...Alarm circuit, 30-32...Plunger for actuator.

Claims (1)

[Scope of Claims] 1. A switch corresponding to the load of an actuator installed in an automobile that locks and unlocks doors, trunks, etc. is provided, and a user side that transmits a fixed number for each switch as a radio wave. An electronic lock device for an automobile equipped with a transmitter includes a comparison circuit that compares the fixed number that receives radio waves from the transmitter and sends out an output if they match, and a comparison circuit that is installed corresponding to the switch. and a door actuator in which only the door actuator corresponding to the switch is operated by a matching output from the comparison circuit;
loads such as a trunk actuator, and the door;
A vehicle-side receiving device is provided which is equipped with a lock switch that is turned on when the trunk or the like is opened, and an alarm circuit that is reset when there is an output signal from the comparison circuit and is set when the ignition key is removed. An electronic lock device characterized in that the alarm circuit operates so that the lock switch is turned on in the absence of an output signal from the circuit.