JPH0710470Y2 - Anti-theft device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an antitheft device that detects an intrusion of a thief into a vehicle compartment by ultrasonic waves and issues an alarm.

[Technical Background of the Invention and Problems Thereof] Conventionally, with respect to an antitheft device for an automobile, a lock device provided on a door is kept in a locked state to prevent theft from a third party. . However, the lock mechanism of such a locking device is often relatively easily unlocked by inserting a thin rod-shaped plate between the door and the window glass and pulling the link inside the door due to its structure. . When such a situation occurs and a thief intrudes into the vehicle compartment, some kind of warning is required to prevent the theft of the vehicle. Therefore, recently, there has been considered an alarm device which issues an alarm by, for example, sounding a horn when a door or the like is forcibly opened while the vehicle is parked. This alarm device detects the rotation of the door key cylinder in the locking direction by locking the door lock, and if all the doors and trunks are closed at this point, activates the thief's intrusion detection function to activate the theft warning state. It comes in. On the other hand, when the owner of the vehicle turns the door key cylinder in the unlocking direction, the alarm device detects the unlocking rotation operation of the key cylinder as unlocking of the door lock, and releases the alarm state of theft.

However, since a reed switch that is magnetically actuated is generally used as the key cylinder switch that detects the rotational operation of the key cylinder, malfunction may occur when a strong magnetic force is applied, for example.
For this reason, the above-mentioned theft warning state may not be forcibly reset by using a strong magnet, and may be erroneously set due to magnetic noise or the like, which is not preferable.

[Object of the Invention] The present invention has been made in view of the above problems, and not only can detect the intrusion of a thief and issue an alarm, but also can perform a reliable set or reset operation in a theft warning state. An object is to provide a theft prevention device that can be performed.

[Summary of the Invention] That is, the antitheft device according to the present invention is in a theft warning state when the door lock switch detects a lock operation of the door lock within a certain time from the time when the rotation of the key cylinder is detected by the door key cylinder switch. Is set, and when the door lock switch detects an unlocking operation of the door lock within the predetermined time, the anti-theft state is reset.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the ground.

FIG. 1 shows the circuit configuration of the anti-theft device. In FIG. 1, 10 is an ultrasonic sensor integrated with a room lamp unit on the ceiling of the vehicle interior as shown in FIG. The ultrasonic wave transmitted from 10a is received by the receiver 10b. The controller 11 also controls the transmission of ultrasonic waves from the transmitter 10a and detects the ultrasonic frequency received by the receiver 10b. by the way,
The controller 11 controls the apparatus and is composed of, for example, a microcomputer. And
PSW is a power switch, and when closed, power B is supplied to the controller 11. IGSW is a switch for the ignition key hole that detects that the ignition key is inserted in the ignition key hole, and DKSW is a door key cylinder switch that detects that the ignition key is inserted in the door key cylinder and has been rotated. The detection signal from the door key cylinder switch DKSW is input to one terminal of the AND circuit AND via the low pass filter 12a and the monostable multivibrator 13. DLSW is a door lock switch that detects the lock (lock) and unlock (unlock) of the front door. The detection signal from this door lock switch DLSW is passed through the low-pass filter 2b and the inverter 14 to the AND circuit. Input to other terminal of AND. In this case, the AND circuit AND is the door key cylinder switch D
A high-level output signal is supplied to the controller 11 when the rotation of the key cylinder is detected by the KSW and the door lock is detected by the door lock switch DLSW. Further, TRSW is a trunk switch that detects the opening and closing of the trunk, and DSW1 to DSW4 are door switches that detect the opening and closing of each door.

Reference numeral 15 is a horn which is connected to the power source B at one end and is connected to the controller 11 at the other end via a line a and which emits an alarm sound. Here, the other end of the horn 15 is also connected to a horn switch HSW installed on the handle. Reference numeral 16 is a headlight whose lighting is controlled by a relay 17, 18 is a taillight whose lighting is controlled by a relay 19, and 20 is an ignition coil whose operation is controlled by a relay 21. Here, one end of the relay coil 17l of the relay 17 is connected to the power source B, and the other end is connected to the controller 11 via the line b.
Further, one end of the relay switch 17S is connected to the power source B, and the other end is connected to the headlight 16. Here, the other end of the relay coil 17l is connected to the light lighting switch LSW1 installed near the handle. Further, one end of the relay coil 19l of the relay 19 is connected to the power source B, and the other end is connected to the controller 11 via the line c. Further, one end of the relay switch 19S is connected to the power source B and the other end is connected to the taillight 18. The relay coil 19l is connected to a taillight lighting switch LSW2 installed near the handle. Further, one end of the relay coil 21 of the relay 21 is connected to the power source B, and the other end is connected to the controller 11 via the line d. The relay switch 21S is closed when the relay coil 21 is excited, so that one terminal of the ignition coil 20 is grounded. In addition, when the relay switch 21S is not closed, one terminal of the ignition coil 20 is connected to the distributor. As a result, the ignition pulse is supplied to the spark plug and the engine can be started.

Next, the operation of the antitheft device configured as described above will be described.

First, when the power switch PSW is turned on, the controller 11 performs the process shown in the flowchart of FIG. Here, first, in steps S1 to S4, it is determined whether or not the conditions for operating the ultrasonic sensor 10 and setting the anti-theft state have been met. In other words, when the driver wants to operate the anti-theft device away from his car, the power switch PSW is turned on, but whether the device actually operates depends on the above steps S1 to S4 or step. S1, S2, S7
~ Depends on S9 and S4.

That is, for example, if the owner of the car first removes the ignition key from the key hole in order to park the vehicle, in step S1 the ignition key hole switch IG
It is determined to be "Yes" based on the detection signal from the SW. Next, after opening the door and getting off, operating the door lock knob on the door lining in the locking direction, and then closing all the doors and the trunk, in all of steps S2, S3, S4, the door lock switch DLSW and the door switch "Yes" is determined based on the detection signals from DSW1 to DSW4. In other words, if the door is locked by operating the lock knob without using the key, the steps after steps S1 to S4 are performed.
Proceed to S5. In this step S5, 20 seconds are allowed to elapse when the set conditions for theft warning are met. Then, proceeding to step S6, the ultrasonic sensor 10 is activated to set the anti-theft state.

On the other hand, when the door key cylinder switch DKSW detects the rotation operation of the key cylinder at first when the door key cylinder switch is operated from outside the vehicle after closing the door without locking the door with the door lock knob at the step S2. As a result, it is determined to be "No" in step S2 and "Yes" in step S7, and the process proceeds to step S8. In this step S8, it is determined whether or not the door lock switch DLSW detects that the door is locked during a certain time tω (for example, 1 second) from the time when the rotation operation of the door key cylinder is detected. When it is determined in step S8 that the door lock is normally operated immediately after the door key cylinder is rotated, the process proceeds to step S4. That is, as shown in FIG.
When the rotation operation of the door key cylinder switch DKSW is detected at, the output signal A of the low-pass filter 12a falls to the low level, and the output signal B of the monostable multivibrator 13 stays at the high level for tω for a certain period of time. When the door lock switch DLSW detects that the door is locked during this time tω, the output signal C of the low-pass filter 12b becomes low level, and the output signal D of the inverter 14 becomes high level, and the AND circuit. The output signal E of AND also becomes high level. In this way, by supplying the high-level output signal E to the controller 11, it is confirmed that the door is locked by the normal operation of the door key cylinder.
The ultrasonic sensor is passed through step S6 after step S4 and step S5.
The operation of the thief intrusion detection function by 10 will start.

Next, in the theft warning state in step S6,
When a change in the reflected wave is detected by the ultrasonic sensor 10 by the receiver 10b, a low level signal is first output to the line d based on the determination that there is an intruder in the vehicle interior of the controller 11, and the ignition coil 20 Ground one terminal. As a result, the output of the ignition pulse to the spark plug is blocked and the engine cannot be started. further,
A low level signal is output to the lines a and b to sound the horn 15 and turn on the headlamp 16. As a result, the third person is warned that there is an intruder in the vehicle compartment, and the vehicle is prevented from being stolen.

Therefore, according to the anti-theft device configured as described above, when the door key cylinder is rotated to lock the door, for example, when the vehicle is parked, the rotation of the cylinder is detected by the door key cylinder switch. rear,
Only when the door lock switch DLSW detects that the door is locked within a certain time tω, the ultrasonic sensor 10 activates the intrusion detection function of the thief and sets the alarm state of theft, so if a strong magnetic field is generated, When a key cylinder is added to the key cylinder, the key cylinder switch DKSW detects the rotation of the cylinder, but the door lock does not lock in a short time, so the intrusion detection function of the thief is accidentally activated. There is no such thing.

In the above embodiment, only the setting operation in the theft warning state after the door is locked has been described, but the same effect can be obtained when the door lock is unlocked and the above-mentioned warning state is reset. That is, if it is detected that the door lock is unlocked within a certain period of time after it is detected that the key cylinder has been rotated, it is determined that the key has been normally unlocked, and the ultrasonic sensor 10 The intrusion detection function of the thief due to is stopped. In other words, even in the case of unlocking the door, if the door lock is not unlocked immediately after the key cylinder rotates, it will not be judged as a normal unlocking operation. The operation of the switch DKSW does not stop the intruder detection function of the thief, and there is no fear of resetting the theft alarm state by using a magnet or the like.

[Advantage of the Invention] As described above, according to the present invention, when the door lock switch detects the lock operation of the door lock within a certain time from the time when the rotation operation of the key cylinder is detected by the door key cylinder switch, the alarm state of theft is detected. Is set, and when the door lock switch detects the unlocking operation of the door lock within the fixed time, it is configured to reset the theft warning state, so it is possible to detect the intrusion of a thief and issue an alarm. Not only is it possible to provide an anti-theft device that can reliably set or reset the anti-theft condition.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing an anti-theft device according to an embodiment of the present invention, FIG. 2 is a diagram showing a mounting state of an ultrasonic sensor of the anti-theft device, and FIG. 3 is an operation of the anti-theft device. FIG. 4 is a timing chart showing the correspondence of the detection operation by the door key cylinder switch and the door lock switch of the anti-theft device. 10 ... Ultrasonic sensor, 11 ... Controller, 13 ... Monostable multivibrator, 14 ... Inverter, 15 ... Horn, 16 ... Head lamp, DKSW ... Door key cylinder switch, DLSW ...
Door lock switch, AND ... AND circuit.

Claims (1)

[Scope of utility model registration request] 1. An anti-theft device for detecting an intrusion of a thief into a vehicle compartment and issuing an alarm, and an intrusion detection function for detecting the intrusion of the thief and a door key cylinder switch for detecting a rotation operation of a door key cylinder key. And a door lock switch for detecting the lock or unlock operation of the door lock, and the door lock switch detects the lock operation of the door lock within a certain time from the time when the rotation of the key cylinder is detected by the door key cylinder switch. In this case, a controller is provided which controls the operation of the intrusion detection function, and stops the intrusion detection function when the unlocking operation of the door lock is detected by the door lock switch within the fixed time. Characteristic anti-theft device.