JPS62289454A - Car theft preventive device - Google Patents

Abstract

PURPOSE:To keep alarm condition for unfair unlocking certainly by admitting release of alert condition of a theft alarm means only when it is sensed that a key equipped with a regular password magnetic member is inserted in a door cylinder lock. CONSTITUTION: A key sensing device 3 is to sense that a key 26 equipped with a regular password magnetic member is inserted in doors 25a, 25b on the driver side and assistant side. That is, said key sensing device 3 consists of a yoke 29 installed in a case 28 outside a door cylinder lock 27, a magnet 30 inside one end of the yoke 29, a hole element 31 inside the other end, and am amplifier circuit 32 outside the other end, Accordingly the magnet 30 generates flux threading a key hole 27a in the door cylinder lock 27, and said hole element 31 senses change of the flux changed by magnetic member 36 provided at the key 26. Then output is made from the amplifier circuit 32. The alert condition is released when this output lies within the set range.

Description

[Detailed description of the invention] 3. Detailed description of the invention (Industrial application field) The present invention relates to a vehicle anti-theft device.

(Prior art and its problems) It detects the secure locking of the doors, trunk, bonnet, etc. when leaving the vehicle, and after a certain period of time the alarm is set, and the doors are closed without the proper reset operation. Various anti-theft devices for vehicles have been proposed that immediately issue an alarm when at least one of the opening/closing bodies is opened due to unauthorized acts such as breaking a cylinder lock (Japanese Patent Laid-Open No. 6
0-50050 to 50056). In this type of vehicle anti-theft device, the door cylinder lock provided on the door is placed in an alarm set state (alarm enabled state) by rotating from the unlocked position to the locked position, and the door cylinder lock is placed in the locked position. The alarm set state is released by rotating the alarm from the unlocked position to the unlocked position.
Therefore, the door cylinder lock can be turned and unlocked by unauthorized persons without using the official key, or the door cylinder lock can be opened using unauthorized methods such as hitting the door cylinder lock with a hammer and dropping it into the interior of the vehicle. He was defenseless against it.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an anti-theft device for a vehicle in which the alarm set state cannot be canceled unless a key to which an authorized password magnetic material is attached is used. purpose.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the vehicle theft prevention device of the present invention includes a key removal detection means for detecting that the key has been removed, and an opening/closing body provided on the vehicle body. opening/closing state detection means for detecting the open/closed state of the opening/closing body; locked state detection means for detecting the locked state of the opening/closing body; output signals of the key removed detection means, the open/closed state detection means, and the locked state detection means are inputted to the When it is detected that all of the opening/closing bodies are in the closed and locked state, the alarm is set to the enable state, and when it is detected that any of the opening/closing bodies is in the open state without a predetermined opening operation being performed, the alarm is set. In the vehicle anti-theft device, the vehicle anti-theft device includes a theft alarm means that releases the alarm, and an alarm release means that releases the alarm enable state when a predetermined alarm release operation is performed. It is characterized in that the alarm set state of the theft alarm means is released only when it is detected that the burglar alarm means is inserted into the door cylinder lock.

(Function) Then, the alarm set state is canceled only when it is detected that the authorized password magnetic key is inserted into the door cylinder lock.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows the positional relationship of various switches and door cylinder locks of a vehicle, and FIG. 2 shows a block circuit of a vehicle anti-theft device. This anti-theft device for a vehicle is controlled by a control circuit 2 (including an input/output circuit, a power supply circuit, a discrimination circuit, etc.) operated by a battery 1. On the input side of this control circuit 2, there is a driver side door 25a as shown in FIG.
A key detection device 3, a lock pin switch 4, an assist side zircon switch 5, a bonnet switch 6, an assist side door switch 7, a driver side door switch 8, a trunk switch 9, and a trunk lock are provided at two locations on the assist side door 25b. A switch (trunk key cylinder rotation detection switch) 10 and a driver side zircon switch 11 are connected to each other, and the operating state of each of these switches is monitored by the control circuit 2.

The lock pin switch 4 is turned off (OF) by setting a key switch (not shown) to the steering lock position using a key 26, which will be described later, and removing the key 26 from the key switch.
F), and when the lock pin is pulled up by inserting the key 26 into the key switch and rotating it (the steering is in the unlocked state), the key 26 is turned on.

The assist side and driver side zircon switches5.
11 is an assist side door 25b and a driver side door 2
When 5a is locked by operating the lock knob, it turns off (OFF), and when 5a is unlocked, it turns on (
ON).

The bonnet switch 6 monitors the opening/closing state of the bonnet, and is turned on (ON) when the bonnet is opened, and turned off (OFF) when the bonnet is closed.

The assist side and driver side door switches 7.8 are provided corresponding to the assist side door 25b and the driver side door 25a.
When a and 25b are closed, they are off (OF), and when they are open, they are on (ON).

The trunk switch 9 monitors the opening/closing status of the trunk, and turns off (OF) when the trunk is closed.
F), and when opened, it becomes ON.

The trunk lock switch 10 is turned on when the trunk key cylinder 19 is rotated to the unlocking angle, and is turned off at other times.

A horn 20, a headlight 21, a blinker 22, a starter cut relay 23, and a buzzer (warning means) 24 are connected to the output side of the control circuit 2.

The key detection device 3 is a device that detects whether a key 26 equipped with a regular password magnetic material is inserted into a door cylinder lock 27 provided on each of the driver side door 25a and the assist side door 25b. be. That is, the key detection device 3 includes a U-shaped case 28 disposed outside the door cylinder lock 27 as shown in FIG.
A yoke 29 having a U-shape in plan is provided inside the case 28. A magnet 30 is placed inside one end of the yoke 29, a Hall element 31 serving as a magnetic detection element is placed inside the other end, and the Hall element 3 is placed outside the other end.
1 is provided, respectively.

This amplifier circuit 32 includes a non-inverting amplifier circuit (voltage follower circuit) 33 and a differential amplifier circuit 3, as shown in FIG.
4 and a Hall element 31. The non-inverting amplifier circuit 33 includes an operational amplifier ICI, and a resistor R1.
, R2 is input to a second operational amplifier IC2, which will be described later.

The differential amplifier circuit 34 includes a second operational amplifier IC2, which amplifies the output voltage of the Hall element 31 minus the reference voltage, and its amplification factor is determined by resistors R, , R4, R, .
It is determined by the resistance value of R6.

As shown in FIGS. 5 and 6, the key 26 has a structure in which a magnetic body 36 is fixed to both sides of a key body 35 made of a non-magnetic material. It may be buried in the key body 35 as shown in FIG.

Note that the number of magnetic bodies 36 is not limited to one, and the number of Hall elements 31 provided in the key detection device 3 is not limited to one either.

The key detection device 3 extracts a password signal from the key 26, and the type of the password signal can be changed to one with a different magnetic permeability by changing the type, size, plate thickness, etc. of the magnetic body 36. There are approximately 15 types available.

That is, in the amplifier circuit 32 shown in FIG.
0V (this IOV is supplied from the control circuit 2 as +5V as a voltage doubler), the maximum output voltage of the second operational amplifier IC2 is 8.5V, and the key 26 is inserted into the door cylinder lock 27. When the key 26 is not inserted into the door cylinder lock 27, assuming that the output of the Hall element 31 is IV, the reference voltage is 1, and the amplification factor of the second operational amplifier IC2 is 50 times. The output voltage of the second operational amplifier IC2 is OV, the key 26
is inserted into the door cylinder lock 27, the output of the Hall element 31 is 1. When it becomes IV, the output voltage of the second operational amplifier IC2 is (1,1-1)X50=5V.

That is, if the magnetic permeability of the magnetic body 36 provided in the key 26 is changed, the output of the Hall element 31 is changed, so that the output of the second operational amplifier IC2 can be obtained in 15 types in the range of 0 to 8.5V. For this purpose, it is sufficient to select a magnetic material 36 that changes the output of the Hall element 31 as shown in Table 1.

(Table 1) Next, the operation of the vehicle anti-theft device according to the present invention will be explained with reference to the theft alarm operation flowchart of FIG.

(1) Transition from alarm set release state to alarm set state.

The alarm is set only when the driver side door and assist side door are locked using the lock knob (keyless lock).

That is, when the vehicle anti-theft device is in the alarm set release state (step 101) from the start state (step 100), when the key 26 is removed from the key switch (step 102), the lock pin of the steering lock mechanism protrudes and this lock is released. The lock pin switch 4, which detects protrusion of the pin, is turned off.

There are two types of operation states that change from this state to the alarm set state; the first is the so-called locking of the assist side door with the lock knob (step 103), and the so-called locking of the driver side door without using the key 26. Locking is performed using a keyless lock (locks when the door is opened and the door is closed after pushing in the lock knob while pulling the door handle) (
Steps 104 and 105), when the trunk and hood are in the closed state (step 106), the switch conditions are:
Lock pin switch 4 is off, assist side zircon switch 5 is off, assist side door switch 7 is off, driver side zircon switch 11 is on-off, driver side door switch 8 is on-off, bonnet switch 6. The trunk switch 9 and the trunk lock switch 10 are all turned off, and the control circuit 2
A command signal is input to the buzzer 25, and the buzzer 25 sounds for 3 seconds to notify that the alarm has been set (step 107).

The second operation state, which is the alarm set state, is to remove the key 26 from the key switch (step 102), lock the driver side door with the lock knob (step 109), and keyless lock the assist side door. Steps 110, 111), when the trunk or hood is closed from the open state (Step 112) (Step 11)
3) The switch conditions are: lock pin switch 4 is off, driver side zircon switch 11 is off, driver side door switch 8 is off, assist side zircon switch 5 is on-off, assist side door switch 7 is off. In the on-off state, the bonnet switch 6, trunk switch 9, and trunk lock switch 10 are all in the off state, and a command signal from the control circuit 2 is input to the buzzer 25, which sounds for 3 seconds and enters the alarm set state. In step 107), the process proceeds to step 108 described above.

As mentioned above, the reason why the operation state that results in the alarm setting state is only the keyless lock (steps 105 and 111) is to prevent forgetting to set the alarm.

(2) Prevents forgetting to set alarms.

Remove the key 26 from the key switch (step 102)
, the driver side door or the assist side door with key 2.
6 is used to lock the door (steps 114 and 115), it is detected that the door has been locked without following the keyless lock procedure, and the buzzer 25 immediately beeps five times intermittently (step 116), indicating that the alarm is set. Notify that this is not the case.

The switch conditions in this case are that the lock pin switch 4 is in the off state, the assist side door switch 7 is in the off state, the assist side zircon switch 5 is in the off state, the driver side door switch 8 is in the on-off state, and the driver side zircon switch 11 is in the off state. On-off state, bonnet switch 6,
The trunk switch 9 and the trunk lock switch 10 are turned on or off.

However, if the bonnet switch 6, trunk switch 9, and trunk lock switch 10 are all off at this time,
Since all areas are locked, it is possible to leave the vehicle without setting the alarm.

Furthermore, if the door is closed without being locked during a car wash or the like, no notification or alarm is activated because no locking operation has been performed.

Also, get into the vehicle to drive, insert the key 26 into the key switch, and lock the door by operating the lock knob (
Even if the steering wheel is locked (locked) or not, the steering wheel is in the unlocked state, so the lock pin is retracted and the lock pin switch 4 is turned on, so no notification or alarm is activated. The alarm will not go into the alarm set state.

(3) Canceling the alarm set using the key 26 equipped with a regular password magnetic material.

In the alarm set state (step 117), when the key 26 attached with a regular password magnetic material is inserted into the door cylinder lock 27, the magnet 30, which is a magnetic flux generating means provided outside the door cylinder lock 27, is activated. A magnetic flux passing through the key hole 27a of the key 27 is generated, and changes in the magnetic flux caused by the magnetic body 36 provided in the key 26 are transferred to the Hall element 3.
Step 1: Detect with step 1, amplify with amplifier circuit 32, and output.
18) When this output voltage is within a preset voltage range (step 119), the alarm set state is canceled (step 120).

(4) Alarm activation due to unauthorized operation.

In the alarm set state (step 117), when the bonnet is pried open by unauthorized means, the bonnet switch 6 is turned on (step 122), and the alarm is activated by the command signal from the control circuit 2 ( Step 1
23) This alarm is activated by making the horn 20 sound intermittently for 5 minutes, and by blinking the headlights 21 and blinkers 22 for 5 minutes, and the starter cut relay 23 is energized until the alarm set is released. Therefore, the engine will not start even if it is directly connected to the battery.

(2) When the trunk is forced open by unauthorized means, that is, when the trunk switch 9 is turned on without the trunk lock switch 10 being turned on (step 124), an alarm is activated by a command signal from the control circuit 2.

■If the door glass is broken and the door is unlocked by operating the lock knob, that is, if the output voltage of the key detection device 3 is outside the preset voltage range (step 125), the driver side zircon switch 11 or When the assist side zircon switch 5 is turned on (step 126 or 127), an alarm is activated by a command signal from the control circuit 2.

■If the door cylinder lock 27 is illegally unlocked using an imitation key or by picking, or even destroyed, and the door is opened, that is, the output voltage of the key detection device 3 is outside the preset voltage range (step 125). When the driver side door switch 8 or the assist side door switch 7 is turned on (step 128), an alarm is activated by a command signal from the control circuit 2.

In addition, in the alarm set state (step 117), as a countermeasure in case an attempt is made to unlock the door illegally using a key other than the authorized key,
If a signal outside the set voltage range of the output voltage of the key detection device 3 is inputted two or more times in a row, the key detection device 3 is stopped for two minutes so that the alarm cannot be easily canceled.

(5) Stopping the W alarm operation.

To stop the alarm activation, use the key 2 equipped with a regular magnetic material 36.
6 into the key hole 27a of the door cylinder lock 27. When the regular key 26 is used, the magnet 30 provided on the outer periphery of the door cylinder lock 27 generates a magnetic flux passing through the key hole 27a of the door cylinder lock 27, and the magnetic body 30 provided on the key 26 The Hall element 31 detects changes in the magnetic flux that vary depending on the magnetic flux, and the amplification circuit 32 amplifies the change and outputs it as a voltage (step 130).
When this output voltage is within a preset voltage range (step 131), the alarm activation output is cut off (step 132).

If a signal outside the set voltage range of the output voltage of the key detection device 3 is inputted two or more times in succession due to the use of an unauthorized key, the key detection device 3 will be stopped for 2 minutes and the alarm set will not be easily canceled. (step 134, 1)
33).

Table 2 shows the above-mentioned operating conditions and operation of the detection switch.

(Table 2) (Effects of the Invention) As detailed above, the vehicle anti-theft device according to the present invention includes a key removal detection means for detecting that the key has been removed, and an opening/closing body provided on the vehicle body. an opening/closing state detection means for detecting a state; a locked state detection means for detecting a locked state of the opening/closing body; and an output signal of the key removed detection means, the opening/closing state detection means, and the locked state detection means is inputted to detect the opening/closing body. When it is detected that all of the above-mentioned opening/closing bodies are in the closed and locked state, the alarm is set to the enable state, and an alarm is issued when it is detected that any of the opening/closing bodies is in the open state without performing the prescribed opening operation. In a vehicle anti-theft device having an alarm means and an alarm canceling means for canceling the alarm enable state when a predetermined alarm canceling operation is performed, the alarm canceling means is configured such that the key attached with a regular password magnetic material is not connected to the door. The present invention is characterized in that the alarm set state of the theft alarm means is released only when the insertion into the cylinder lock is detected.

Therefore, the alarm set state can be canceled only when the detection means detects that a key to which a valid password magnetic material is attached is inserted into the door cylinder lock.

Therefore, it is possible to deal with fraudulent acts such as manipulating the interior lock knob by breaking the door glass, or inserting a wire or the like through the gap between the door glass and the door and directly swinging the lock/unlock lever of the door lock mechanism to unlock the door. .

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the arrangement positions of various switches and cylinder locks in a vehicle, Fig. 2 is a block diagram of a vehicle anti-theft device, Fig. 3 is a partially sectional front view of a key detection device, and Fig. 4
5 is a plan view of the key, FIG. 6 is a sectional view taken along line Vl-VI in FIG. 5, and FIG. 7 is a plan view showing another embodiment of the key. FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7, and FIG. 9 is a flowchart of the operation of the warm alarm. 3...Key detection device (key detection means), 5.6...
Zircon switch (locked state detection means), 7.8...
Door switch (opening/closing state detection means), 25... buzzer (theft alarm means), 27... door cylinder lock.

Claims (1)

[Claims] 1. a key removal detection means for detecting that the key has been removed; an open/closed state detection means for detecting the open/closed state of an opening/closing body provided on the vehicle body; a locked state detecting means for detecting the locked state of the opening/closing body; When it is detected that all of the opening/closing bodies are closed and locked by inputting the output signals of the removal detecting means, the opening/closing state detecting means, and the locking state detecting means, the alarm is set to an alarm enable state, and any of the opening/closing bodies is set to the alarm enabled state. A vehicle having a theft alarm means that issues an alarm when it detects that a person is in an open state without performing a predetermined opening operation, and an alarm release means that releases an alarm enable state when a predetermined alarm release operation is performed. In the theft prevention device for a car, the alarm release means releases the alarm set state of the theft alarm means only when it is detected that a key attached with an authorized password magnetic material is inserted into the door cylinder lock. A vehicle anti-theft device characterized by: