JPH0361148A - Burglary preventing device - Google Patents

Abstract

PURPOSE:To fit a burglary preventing device of a car having a door lock actuator to an existing vehicle easily by detecting the current flowing to the actuator when a locking device is locked, and switching an alarm control circuit to the armed condition. CONSTITUTION:A burglary preventing device 10 comprises an alarm control circuit 11 having input terminals 11a, 11b to which the lock signal and the unlock signal for respectively displaying the locked condition and the unlocked condition of a door lock device (not shown in a figure) is input and input terminals 11c, 11d to which a door lock actuator (motor) 16 is connected through an amplifier 14, 15. The motor 16 is controlled by a lock control circuit 20 for receiving the wireless signal including the predetermined code through relays 17, 18. In this case, an alarm control circuit 11 is formed so as to generate the alarm signal when the trigger signal is received under the armed condition and to switch the alarm control circuit 11 to the armed condition by detecting the current flowing to the motor 16 at the locking time of a locking device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an anti-theft device, particularly to an anti-theft device that can be mounted on a motor vehicle having a door lock actuator.

Various types of electronic locks are known as locking devices for locking automobile doors. For example, JP-A-54-2789
As disclosed in Publication No. 9, the push switch type keyless entry device is currently equipped with a plurality of switches for inputting a five-digit numerical value, and these switches are turned on and off using fingers according to a predetermined order. Passenger cars, transportation vehicles,
Widely used as a locking device for doors of buildings or secret rooms. However, the button switch type keyless engine 1
This device is undesirable from the viewpoint of theft prevention because it is installed with a plurality of switches exposed to the outside.

Therefore, a new electronic lock has been proposed that unlocks the lock using a predetermined code by turning on and off a switch that generates a Morse code signal.

For example, Japanese Patent Publication No. 59-32634 discloses an electronic lock for automobiles that generates a serial Morse (M number) by operating a handle and turning a switch on and off. However, with this device, the start signal is The signal should be long for 2 seconds or more.In addition, the signal representing each digit number should be short and strong for 0.5 seconds or less, and the digit separator signal should be about 1 second to distinguish each signal. Kosho 59-3263
Publication No. 4 discloses an electronic lock that allows the on/off pulse width to be freely selected and set, and that unlocks when the time ratio between on time and off time is within an allowable range when the switch is operated. are doing. Furthermore, for example, JP-A-60-13819
As shown in Publication No. 0, a radio-controlled lock that unlocks or locks a door by generating radio waves containing a predetermined code number is well known.

On the other hand, automotive alarm control circuits are known, for example as disclosed in US Pat. No. 3,781,854. This automobile alarm control circuit is switched from a disabled state to an armed state when all openings and closing parts of the automobile are closed and the doors are locked by operating a cylinder lock. If an opening/closing part such as a door, trunk, or hood is opened/closed illegally in an armed state, an alarm is automatically generated, thereby preventing theft of the automobile.

Further, as disclosed in Japanese Patent Application Laid-open No. 60-50053, there is a key removal detection means for detecting that a key is removed from a key hole for starting the engine, and detecting the open/closed state of an opening/closing body provided on the vehicle body. a lock detecting means for detecting that the opening/closing body is locked without using a key; and a lock detecting means for detecting that the opening/closing body is locked without using a key; and a lock detecting means for detecting that the opening/closing body is in a closed state by inputting signals from the opening/closing status detecting means and the lock detecting means. A detection means for detecting that the lock is in the locked state, and a theft alarm judgment for detecting and notifying that one of the opening/closing bodies has been opened without a predetermined opening operation when the key is in the removed state. Anti-theft devices for vehicles equipped with means are well known. This device switches to the armed state after confirming that all the opening/closing bodies are in the closed and locked states, so false alarms due to doors being left ajar can be prevented. Furthermore, since the indicator lamp is lit upon detecting that the opening/closing body is in the closed and locked state, it is possible to reliably detect the ajar state and also to reliably recognize a mistake in switching to the armed state.

When the vehicle is about to be stolen, the conventional anti-theft device is switched to an armed state by turning on and off a switch that is activated when a key is used to operate a cylinder lock provided on the door. Therefore, when installing an anti-theft device, it was necessary to install a switch adjacent to the cylinder lock and use the electrical signal generated from the switch that is operated in conjunction with the cylinder lock. . For this reason, an anti-theft device could not be installed unless a switch was provided adjacent to the cylinder lock.

Moreover, since cars that have already been sold and are in use are also targets of theft, it is necessary to provide anti-theft devices to existing cars or locking devices.

However, in the past, existing vehicles or locking devices could not be equipped with anti-theft devices unless a switch was installed adjacent to the cylinder lock.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an anti-theft device which eliminates the above-mentioned drawbacks and can operate without providing a switch adjacent to the cylinder lock.

The anti-theft device of the present invention includes, for example, an actuator that is provided in a central door lock device and locks or unlocks the lock device, and an actuator that is switched to an armed state or a disarmed state and is in the armed state. and an alarm control circuit that generates an alarm signal when the trigger signal is received. The alarm control circuit is switched from a disarmed state to an armed state and from an armed state to a disarmed state by detecting the current flowing through the actuator when the lock device is locked and unlocked.

When the actuator is actuated and a lock signal is generated in the closed state of the working door, the door is locked by actuation of the actuator, and the anti-theft device is then switched to the armed state. Therefore, when an opening/closing part such as a door is opened in the armed state, the alarm device is activated. If the actuator is actuated and an unlock signal is generated during the armed state or activation of the alarm device, the armed state is switched from the disarmed state or alarm state to the alarm stop state.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows a circuit diagram of an anti-theft device 10 of the present invention.

As shown in the figure, the anti-theft device 10 includes an alarm control circuit 11 composed of a one-chip microcomputer or a plurality of ICs. Input terminal 11a of alarm control circuit 11
and llb are connected to a lock switch and an unlock switch, which respectively display the locked state and unlocked state of the door lock device (not shown). Input terminal ↓2 that receives the lock signal input from the lock switch and input terminal 1 that receives the unlock signal input from the unlock switch
3 can use various types of switches. Although not shown, for example, when the door lock device is manually or electrically switched between the locked state and the unlocked state, the lock switch and unlock switch connected to the input terminals 12 and 13 are momentary at the time of switching. A transient output switch that generates a pulse and a status display output switch that continuously displays the status after switching are used. These temporary output switches and status display output switches are provided in the door lock actuator, door lock timer, or door lock device, and which switch is used differs depending on the vehicle model.

A transient output switch produces a short pulse width output the moment the lock knob is moved to the locked position.

For this reason, in a door opening locking device that uses a temporary output switch, when the door is opened, the temporary output switch does not output either a lock signal or an unlock signal, so whether the door is in the locked state or not. Unable to identify whether it is unlocked or not. On the other hand, since the status display output switch continuously generates the unlock signal when the door is opened, it is easy to distinguish between the locked state and the unlocked state. When equipping an existing vehicle with an anti-theft device, it must first be determined whether a temporary output switch or a status indicating output switch is being used. Therefore, if an unlock signal is received when the door is opened, it can be determined to use the status display output switch, and if an unlock signal is not received, it can be determined to use the temporary output switch. When it is determined that the temporary output switch is to be used, the input terminal 23 receives the door switch input when the door switch is turned on, so the use of the temporary output switch is memorized, and the lock signal is then transmitted. Wait for a pulse signal to appear. Regardless of whether the door is opened or closed in the standby state, it is necessary to memorize the locked state when a pulse signal representing the lock signal is generated, and to confirm the stored locked state after the door is closed.

In this embodiment, for a vehicle using a temporary output switch, lock signal inputs and unlock signal inputs of a lock switch and an unlock switch that generate temporary outputs are applied to input terminals 12 and 13, respectively. . In addition, for vehicles that use a status display switch, an output signal from the unlock switch that continuously generates a low-level output when the lock device is in the unlocked state is given to the input terminal 3, and the input terminal Handcraft 2 is not used.

Input terminals 11c and lid of the alarm control circuit 11 are connected to one end and the other end of a motor 16 forming a door lock actuator via a transistor 14 and a circuit 5 forming an amplifier, respectively. Further, one end and the other end of the motor 16 are respectively connected to relays 17 and 18. relay 17
．． 18 is connected to the lock control circuit 20. The lock control circuit 20 can be controlled in various ways, for example by the transmitter 2.
A receiving circuit 22 that receives a radio signal including a predetermined code transmitted from 1 is connected. To lock the door locking device, the relay 17 is turned on, so that when the transistor 14 is turned on, the input terminal lie of the alarm control circuit 11 receives the lock signal of the motor 16. Further, in order to unlock the door lock device, the relay 18 is turned on, and therefore, when the transistor 15 is turned on, the input terminal 11 of the alarm control circuit 11. d receives the unlock signal for the motor 16.

An input terminal 23 connected to a door switch and an input terminal 24 connected to a detection switch are connected to input terminals lie and llf of the alarm control circuit 11, respectively. A door switch is a switch that turns on when a car door is opened and turns on the room lamp. The detection switches include a door switch, a foot switch and a trunk switch that detect the opening of the automobile hood and ranks 1 to 1, which are activated when the cylinder lock is tampered with.
1. Includes various switches such as a tamper switch and a vibration detection switch that detects vibrations when an automobile receives external force and vibrates.

An input terminal 26 for receiving a signal when the ignition switch is turned on is connected to the input terminal 11g of the alarm control circuit 11 via a transistor 25 constituting an amplifier. An input terminal 11h of the alarm control circuit 11 is connected via a pulse generation circuit 27 to the collector of a transistor 28 as a switching element. The emitter of transistor 28 is connected to the collector of transistor 14.

Further, the emitter of the transistor 28 is connected to a DC power supply via a constant voltage circuit 30. Constant voltage circuit 30 is connected to power input terminal 11j of alarm control circuit 11. The base of the transistor 28 is connected to the collector of the transistor 14 and the input terminal 11j of the alarm control circuit 11.

The output terminals 11k and [1] of the alarm control circuit [1] are connected to the anodes of a green indicator 31 of a green diode and a red indicator 32 of a red diode through amplifier circuits 35 and 36, respectively. Each cathode of the green diode 31 and the red diode 32 is grounded. Output terminal 11 of alarm control circuit 11. m is connected to the alarm a device 34 via an amplifier circuit 33. As the alarm device 34, a horn, a lamp, or other sound device or light emitting device installed in the automobile is used.

In the above configuration, the alarm control circuit 11 is programmed to operate according to the operating sequence shown in FIGS. 2 and 3. Proceeding from step 50 to step 5, the door opening/closing detection means of the alarm control circuit 11 detects the voltage applied to the input terminal Lie. When the door is opened, the door switch is turned on, so the input terminal 23 and the input terminal li
The voltage applied to e changes from a high level to a low level (step 52), and at the same time transistors 1 to 14 are turned on. When transistor 14 is turned on, transistor 2
8 is also turned on, a reset pulse is applied to the input terminal 11h through the pulse generation circuit 27, and the alarm control circuit 1
1 is switched from standby mode to operating mode. Next, in step 54, the lock detection means in the alarm control circuit 11 determines whether or not an unlock signal is received.

As mentioned above, when the status display output switch is used as the unlock switch 13, the unlock switch 1
3 continuously generates a low-level unlock signal as long as the lock device maintains the unlocked state. Conversely, as long as the lock device maintains the locked state, a high level lock signal is continuously generated.

Therefore, the lock switch 12 and the input terminal 11a are unnecessary for vehicle models that use a status display output switch. However, in vehicle models that use a temporary output switch, when the lock device is switched between the locked and unlocked states, it only generates a low-level lock signal and unlock signal with a short pulse width at the moment of switching. . For this reason, in vehicle models that use a temporary output switch, it is necessary to wait for the generation of a lock signal with a short pulse width, and to store the occurrence of the lock signal when it occurs. Furthermore, the temporary output switch actually used generates a short pulse width lock signal and unlock signal only when the switch is operated to the locked state or unlocked state, respectively.

No output is generated when returning from the locked or unlocked state to the neutral state. Thus, the transient output switch has irreversible characteristics.

When the door is opened in step 51, the door is in the unlocked state, so if the status display output switch is used as the unlock switch 13 in this case, the input terminal 11
b becomes low and healthy. However, if a temporary output switch is used as the unlock switch 3, the lock device cannot be switched to the unlocked state at the moment the door is opened. Therefore, the transient output switch is unlocked by switch 1.
3, the input terminal 11b is at a high level when the door is opened. As described above, in step 54, the lock detecting means detects whether or not an unlock signal is received at the time when the door switch 23 is turned on, so that the lock detecting means operates as a temporary output switch or a status display output switch as an unlock switch. It becomes possible to determine which of the following is equipped.

As mentioned above, in step 54 the door switch 23
If it receives an unlock signal when it turns on,
The lock detecting means determines that the status display output switch is being used and causes the green indicator 31 to blink in step 55.

The purpose of blinking the green indicator 31- is to easily visually confirm that the door is open.

Therefore, by blinking the green indicator 31, the open state and ajar state of the door can be optically displayed to the driver. If the unlock signal is not received when the door switch 23 is turned on in step 54, the lock detection means determines that the temporary output switch is being used, and in step 54, the lock detection means determines that the temporary output switch is used. The system waits for a lock signal, and then in step 55 the green indicator 31 flashes. Next, the process proceeds to step 56, where it is determined whether the locked state is stored. Since the lock state is not stored at first, the process advances to step 57. In step 576, if the temporary output switch is used, the lock signal waiting state is maintained in step 54, so the process proceeds from step 57 to step 58, and it is determined whether or not a lock signal with a short pulse width has been received. do. Step 5
When the lock signal is received in step 8, the lock state is stored in step 59, and then the process proceeds to step 64. If no lock signal is received in step 58, step 6
Proceed to step 4. In step 57, if the vehicle uses a status display output switch, the vehicle cannot be switched to the lock signal standby state, so the process proceeds to step 63, where it is determined whether or not an unlock signal has been received. When the status display switch is in the unlocked state, a low level unlock signal is input to the input terminal 3.
A high-level lock signal is applied to the input terminal 3 when the lock is in the locked state. Therefore, when the lock is in the unlocked state, the unlock signal is continuously output, so the process proceeds from step 63 to step 64, but when the state is switched to the locked state, step 63
The process then proceeds to step 59 to store the lock state, and then proceeds to step 64. In step 64, it is determined whether or not the first aa is closed. If the door is not 17I, step 5
Returning to step 5, while the green indicator 31 continues to blink, it is determined in step 56 whether or not the locked state is stored.

Since the locked state has already been stored in step 59, the process proceeds from step 56 to 61-, in which it is determined whether an unlock signal has been received. When the lock knob is operated in the unlocking manner and the unlock switch is operated while the green indicator 31 is blinking, an unlock signal is generated. Upon receiving the unlock signal, step 61
The process proceeds to 64, and when an unlock signal is received, the memory of the locked state is erased in step 62, and the process proceeds to step 6.
Proceed to step 4. If the door is not closed in step 64, the operations are repeated between steps 55 and 64.

In step 64, when the door is closed, the lock state detection means determines whether the lock state is stored. If the lock state is cleared in step 62,
Step 65 leads to step 93 in FIG. 3, and after turning off the green indicator 31, the process returns to start 50. If the locked state is stored in step 65, the process advances to step 66 and the green indicator 31 is turned off.

The transmitter 21 sends out a wireless signal including a lock signal, and the receiving circuit 22 receives this wireless signal.

In response to this, the lock control circuit 20 turns on the relay 17 and can operate the motor 16 in the locking direction. Conversely, the transmitter 21 sends out a wireless signal including an unlock signal, and the receiving circuit 22 receives this wireless signal. In response to this, the lock control circuit 20 turns on the relay 18 and can operate the motor 16 in the unlock direction.

When the door is closed in step 51, the process proceeds to step 60, and the base of the transistor 14 detects the current flowing to the motor 16 as an actuator, and the motor 1
6 has generated a lock signal. Motor 1
6 does not generate a lock signal, step 60 returns to start 50. When the motor 16 is actuated in the direction of the locking force 19 in step 60, the locking device is locked and at the same time
Transistor 14 is turned on. When the transistor ]-4 is turned on, the transistor 28 is also turned on, so a reset pulse is applied to the input terminal 11h through the pulse generation circuit 27, and the alarm control circuit 11 is switched from standby mode to operation mode.

Next, proceeding to step 67, when the input terminal lie is at a high level and the lock state storage means stores the lock state, the timer means activates a 30 second timer. Further, in step 68, the red indicator 32 is turned on to indicate that it is in the armed preparation state. continue,
In step 69, it is determined whether the door has been opened. When the door is opened, the input terminal 23 is switched to a low level. If the door is not opened, the process proceeds to step 7°, where it is determined whether an unlock signal has been generated at the input terminal 13.

Furthermore, when the transmitter 21 sends out a wireless signal including an unlock signal, the receiving circuit 2220 receives this wireless signal. In response, the lock control circuit 20 turns on the relay 18, and the motor 16 is operated in the unlock direction. The base of the transistor 15 detects in step 71 whether or not an unlock signal is received by the current flowing through the actuator, that is, the motor 6. When the base of transistor ↓5 receives the unlock signal,
The transistor 15 is turned on and a low level unlock signal is applied to the input terminal lid. However, if the unlock signal is not generated, the process proceeds to step 72 and the input terminal 1 is
Based on the signal received by 1g, it is determined whether the ignition switch is turned on. When the ignition switch is turned on, a high level voltage is applied to the input terminal 26, and the transistor 25 is turned on. Therefore, a low level signal is applied to the input terminal 11g.

When the unlock signal is received in step 70,
When the unlock signal for the motor 16 is received in step 71 or when the ignition switch is turned on in step 72, the process returns to start 50. If the ignition switch remains off in step 72, the process proceeds to step 73, where it is determined whether the 30 second timer has counted a predetermined time. If the predetermined time has not elapsed, the process returns from step 73 to 69.

When the door is opened in step 69, the process proceeds to step 75, and after erasing the memory of the locked state, the process returns to step 55. As mentioned above, when the 30 second timer does not count the predetermined time, the operations from steps 69 to 73 are repeated.

When the elapse of the predetermined time is counted in step 73, the process proceeds to step 74, where the red indicator 32 is turned off, and
Proceeding to step 76 in FIG. 3, the red indicator 32 flashes slowly once every 30 seconds or 3 to 4 minutes. The red indicator 32 is a 150 msec pulse with a magnitude of -0 to 50 mA, for example 20 mA. This is because by reducing the blinking speed of the red indicator 32 and causing it to blink slowly, it is easy to visually confirm that the alarm control circuit 11 is in the armed state. In the armed state, the car's engine is stopped and the battery is not charged. Therefore, when displaying the armed state by flashing the red indicator 32, it is necessary to reduce current consumption as much as possible. Therefore, in this embodiment, by making the off time of the red indicator 32 longer than the on time, the current consumption when the red indicator 32 is energized can be significantly reduced. In this case, the average current flowing through the red indicator 32 is 2 ((7 self-consumption current when the red indicator 32 is on x time) + (current consumption when the red indicator 32 is off x time)) ÷ (the current consumption when the red indicator 32 is off x time) On time quantum off time). If the average current (2) is 1 to 3 mA or less, short-term discharge of the battery can be sufficiently prevented in practice. If a vehicle battery is sufficiently maintained, its capacity will not drop below the level required to start the engine even if it is kept in an armed state for more than three months.

When the red indicator 32 is in a slow blinking state, the process proceeds to step 77, where it is determined whether the motor 16 has generated an unlock 3 signal. When the motor 16 is operated in the unlocking direction and the locking device is unlocked, the base of the transistor 15 detects the current flowing through the motor 16 and the transistor 15 is turned on.

Therefore, since a low level voltage is applied to the input terminal lid, the unlock signal for the motor 16 can be received by the input terminal lid. When the motor 16 generates an unlock signal in step 77, step 93
At this point, the red indicator 32 is turned off to release the armed state. After switching to the disarmed state in this way, the process returns to the start state. If the motor 1-6 does not generate an unlock signal, the process proceeds to step 78, where it is determined from the input terminal 23 whether the ignition switch has been turned on.

When the ignition switch is turned on, the armed state is released in step 93 as described above. This is to release the armed state when the ignition switch is operated inside the vehicle. If the ignition switch is maintained in the off state in step 78, it is determined in step 79 whether or not the theft prevention sensor such as the door switch, foot switch, trunk switch, tamper switch, etc. applied to the input terminal 24 is turned on. . When the anti-theft sensor is in the OFF state, steps 76 and 79 are repeated. When one of the theft prevention sensors turns on in step 79, the process proceeds to step 80, where the red indicator 32 turns off, and in step 81, the timer means starts counting with a 6-second timer, and then in step 82, the red indicator 32 turns 1. Quick flash every second. While the 6-second timer is operating, the alarm is ready. 6
The time lag of seconds is set so that when the alarm preparation state is mistakenly switched, the ignition switch is operated to switch to the disarmed state before switching to the alarm state.

Thereafter, in step 83, it is determined whether the ignition switch ON output is applied to the input terminal 26. Here, when the ignition switch is turned on, the process proceeds to step 93.

An operation similar to the above operation is performed and the process returns to the start 50. If the ignition switch is kept in the off position,
Proceeding to step 84, it is determined whether the 6 second timer of the timer means has counted 6 seconds.

If 6 seconds have not elapsed yet, return to step 82, continue the quick flashing of the red indicator 32, and repeat steps 82 and 8.
Repeat the operations from step 4. When 6 seconds have elapsed, the state is switched to an alarm state and the red indicator 32 is turned off (step 85). Further, in step 86, a one-minute timer is activated, and a drive signal is applied to the alarm device 34 from the output terminal 11m via the amplifier circuit 33. Therefore, the alarm device 34 is activated in step 87, during which the green indicator 3 and the red indicator 32 flash alternately. Thereafter, the process proceeds to step 89, where it is determined whether the ignition switch is turned on, and if the ignition switch is maintained in the off state, the process proceeds to step 90.
The process proceeds to , and it is determined whether the one-minute timer has counted one minute. If it is less than 1 minute, return to step 88;
Repeat operations between 8 and 90. When the ignition switch is turned on in step 89, the Stella 94
After stopping the drive signal to the alarm device 34 and canceling the alarm, the process proceeds to step 93, after which the above-described operations are repeated. When the timer means counts up in step 90, the green indicator 31 and red indicator 32 are turned off in step 91. Thereafter, in step 92, it is determined whether the anti-theft sensor is turned on again. If it is turned on, the process returns to step 86 and the l9 timer is activated again, and the operations from step 86 onwards are repeated.

The above embodiments of the invention can be modified. Although FIG. 1 shows an example in which the alarm control circuit 11 is configured by a microcomputer, it can also be configured by a discrete circuit as shown in FIG. 4.

The anti-theft bag W10 has a door switch 124 that is turned on when the door is opened, a tamper switch 125 that is turned on when the locking device is illegally broken, and a trunk that is opened = 27. The trunk switch 126 is turned on when the hood is opened, and the foot switch 12 is turned on when the hood is opened.
7 is provided. The switches 124 to 127 constitute opening/closing detection means for the opening/closing section.

In addition, a mechanical keyless lock that does not require a key is used to close the vehicle door. Mechanical keyless locks have a mechanism that automatically locks the door by moving the lock knob on the door to the lock position and then closing the door while pulling the outdoor handle. In order to interlock this mechanism and to detect the locked position of the lock knob, status display output switches 122 and 1-23 are provided inside the left and right doors of the vehicle, respectively, to detect the locked position of the lock knob.

The switches ↓24 to 126 are connected to one input terminal of each of the AND gate 133 and the OR gate 132, and the switch 127 is connected to the other input terminal of the AND gate 133 and the OR gate ]-32. Ant game-1-↓33
The output terminal of the motor 1.6 and the terminal generating the lock signal of the motor 1.6 are respectively connected to an AND gate "-=2834". Ant game 1-134 is connected to a timer circuit 136 via an OR gate 135. Timer circuit 136 provides an output for 30 seconds, for example. The output terminal of the timer circuit 136 is connected to the set terminal of the R/S flip-flop 140 via a one-shot multivibrator ↓37. R/S flip-flop 14
The Q output terminal of 0 is connected to one input terminal of AN1-gate 139. The other input terminal of the AND gate 139 is connected to the pulse shaping circuit connected to the OR gate 132.
connected to the output terminal of

Status display output switches 122 and 123 are AND gate 1
01, and the AND gate 101
The output terminal of OR game 1-132 is connected to the other input terminal of . Or game! - The output terminal of 132 is connected to the delay circuit 103. The output terminal of Antogame 1-101 is connected to the first input terminal of Antogame 1-102,
Status display output switches 122 and 123 and a delay circuit O3 are connected to the second and third input terminals of the AND gate 102, respectively.

The output terminal of the analog game 1-139 is connected to the set terminal of the R/S flip-flop 106 and the timer circuit 07. The Q output terminal of R/S flip-flop 106 is connected to starter circuit 112 . The timer circuit 107 provides an output for, for example, three minutes to one input terminal of the AND gate 108.

A pulse generation circuit 109 is connected to the other input terminal of the AND gate 1.08. The output terminal of AND gate 108 is connected to the base of transistor 109, the collector of transistor 109 is connected to alarm device 34, and the emitter is grounded.

The output terminal of timer circuit 107 is connected to one-shot multivibrator 111. Furthermore, the status display output switches 122 and 123 are connected to a clear terminal of a timer circuit 136 via an inverter 121 and an OR gate 120. A terminal for generating an unlock signal for the motor 16 is connected to a pulse forming circuit 131. Pulse forming circuit 13
The output terminal of 1 is an OR gate 120. It is connected to the reset terminal f of the R/S flip-flop 106 via the reset terminal of the R/S flip-flop 140 and the OR game 1-113. OR gate 120 is connected to a clear terminal of timer circuit 136. R/S flip-flop]-32
The output terminal of the OR gate 135 is connected to the set terminal of.

When the anti-theft device 10 is activated, all opening/closing parts of the vehicle are closed, and the door switch 124 and tamper switch 1 are activated.
25, trunk switch 126 and foot switch 12
AND gate 133 generates an output when all 7 are off. When the motor 16 operates in the locking direction in this state,
AND gate 134 produces an output and timer circuit 136
is activated. The timer circuit 136 counts approximately 30 seconds, during which it is switched from a disabled state to an armed ready state. When 30 seconds have elapsed, an output is generated from the timer circuit 1-36, the R/S flip-flop 1.40 is switched to the cell 1 state, and an output is generated from the Q output terminal. This state is an armed state.

This armed state also applies when a mechanical keyless lock operation is performed.

That is, all the opening/closing parts of the vehicle are closed, and the door switch 124, tamper switch 125, and trunk switch 1 are closed.
When switches 26 and 21 through 127 are all off, OR gate 132 produces a low level output. Therefore, the other input terminal of the anime game 1-101 is at a high level. In this state, when the door on the passenger seat side is locked and closed, the status display output switch 122 is turned off.

Furthermore, if the door is closed by pressing the lock knobs 1 to 1 on the driver's seat side and then pulling the door handle from the outside of the vehicle, the driver's seat door will also be locked and the status display output switch 122 will also be turned off. . Status display output switch 12
When both 2 and 123 are off, AND gate 10
1 is turned on. Therefore, AND gate 102 is also turned on. This is because the delay circuit ↓03 switches to the armed state only when the driver's side door is finally locked. The output generated from the AND gate ↓02 causes the 2 pulse shaping circuit 138 to generate an output,
A timer circuit 136 is activated via 35.

Therefore, as described above, the R/S flip-flop 140 can be set to switch to the armed state.

In the armed state, when any one of the opening/closing parts is opened, one of the door switch 124, tamper switch 125, trunk switch 126, and foot switch 127 is turned on. Therefore, the R/S flip-flop 106 is turned on through the OR gate 132 and the gates 1 through 39, thereby preventing the starter circuit 112 from jumping.

At the same time, the timer circuit 107 is activated and an intermittent signal is applied to the base of the transistor ↓09 via the AND gate 108. Therefore, the alarm device 34 is activated for three minutes. When the R/S flip-flop 1.4.0 is maintained in the set state in the armed state, in the alarm state in which the alarm device 34 is activated, or in the armed ready state in which the timer circuit 136 is activated, the motor is activated. When an unlock signal is generated from 16, timer circuits 136 and 10
7 is cleared and the R/S flip-flop 14
．． 0 and 106 are reset and switched to the disarmed state.

The above embodiments of the invention can be modified. For example, in addition to using radio to operate the lock control circuit 20, infrared or a keyless entry system with multiple switches can be used. Further, in the embodiments shown in FIGS. 1 and 2, the state may be switched to the armed state or the disarmed state by operating a mechanical keyless lock or a cylinder lock linked to the lock 21b. In the above embodiment, an example was shown in which the anti-theft device according to the present invention is attached to an automobile, but it will be understood that it can be attached to a locking device of a building or a facility other than an automobile.

As mentioned above, the anti-theft device can be switched to the armed or de-armed state by the electric current that operates the actuator, so existing vehicle or other locking devices can also be electrically connected to predetermined terminals. Easy to install by simply connecting. Therefore, it is possible to prevent unauthorized intrusion and theft of vehicles, buildings, etc.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an anti-theft device according to the present invention, FIGS. 2 and 3 are flow charts showing the operation sequence of the circuit in FIG. 1, and FIG. 4 is a circuit diagram showing another embodiment of the invention. be. 100. Anti-theft device, 110. Alarm control circuit, 160
．． Motor (actuator)

Claims (2)

[Claims] (1) The lock device has an actuator that locks or unlocks the lock device, and an alarm control circuit that generates an alarm signal when it is switched to an armed state or a disarmed state and receives a trigger signal while in the armed state, and the lock device is locked. An anti-theft device characterized in that an alarm control circuit is switched from a disabled state to an armed state by detecting a current flowing through an actuator when the device is locked. (2) It has an actuator that locks or unlocks the locking device, and an alarm control circuit that generates an alarm signal when it is switched to the armed state or disarmed state and receives a trigger signal while in the armed state, and the locking device is locked. An anti-theft device characterized in that an alarm control circuit is switched from a disarmed state to an armed state and from an armed state to a disarmed state by detecting current flowing through an actuator when the device is locked and unlocked.