JP2000344054A - Antitheft device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sound an alarm only at the time set in advance not cause noise pollution around when wiring is cut off between a control part and an operation part. SOLUTION: The control part 14 of an antitheft device 10 is connected with the battery 38 of a vehicle by way of an ignition switch 36. An operation part 12 is connected with the control part 14 by way of a control wire 24 a part of which is exposed to the inside of a cabin so as to be energized by a regulator 48 within it. When a power supply switch 60 of the operation part 12 is turned on, the L level of output voltage of the regulator 48 is inputted into the CPU 30 of the control part 14. The resistors 74 and 72 compose a wire disconnection detecting part 76, and upon disconnection of a control line 24, the L level of voltage lowered down by means of the resistor 74 for the output voltage of the rerulator 48 is inputted to the CPU 30, and the CPU 30 allows an actuation signal to be given to an alarm unit 16, so that the alarm sounds.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing a vehicle from being stolen when a driver is absent, and relates to a control unit for controlling the operation of an alarm and an operation unit for activating the control unit. The present invention relates to a vehicle anti-theft device having a function of generating an alarm when the wiring of the vehicle is cut.

[0002]

2. Description of the Related Art An anti-theft device for a vehicle has been developed which detects the occurrence of an abnormality in a vehicle by detecting an impact or an impulsive sound acting on the vehicle, and issues an alarm to prevent the theft of the vehicle. . In such an anti-theft device, a control unit that generally controls an alarm device and an operation unit that sets (sets) the control unit to an operation state are separately formed. The operation unit is arranged at a position in the vehicle cabin where the driver can easily operate, and the control unit is arranged on the back side of an instrument panel outside the vehicle cabin, and the two are connected by wiring.

However, in the conventional anti-theft device, a part of the wiring connecting the control unit and the operation unit is exposed in the vehicle interior. When the wiring is cut, power is supplied to the control unit. It goes away and the alarm is stopped. Therefore, when the vehicle is stolen, the wiring connecting the control unit and the operation unit is disconnected. Therefore, a vehicle anti-theft device that generates an alarm when a part of the wiring is cut off has been proposed (for example, Japanese Utility Model Application Laid-Open No. 60-71996, Japanese Utility Model Application Sho 63).
-26286, JP-A-7-132796).

The anti-theft device disclosed in Japanese Utility Model Laid-Open Publication No. Sho 60-71996 connects a control device via a control line to a switching circuit that operates an oscillation circuit, and connects the battery to the switching circuit when the control line is disconnected. When the voltage is applied, the oscillation circuit operates to generate an alarm.

The anti-theft device disclosed in Japanese Utility Model Publication No. Sho 63-26286 forms a parallel circuit in which a plurality of horns are connected in parallel, connects the horn to a control unit, and disconnects one of the horn wires. The control unit is activated to generate an alarm according to the change in the combined resistance of the parallel circuit.

Further, in the anti-theft device described in Japanese Patent Application Laid-Open No. 7-132796, a controller is connected to a battery and an alarm device via a plurality of connectors, and one of the connectors is disconnected to apply the voltage of the battery. As a result, the microcomputer outputs an operation signal to the alarm device to generate an alarm.

[0007]

[Problems to be solved by the invention]
In the anti-theft devices described in JP-A-7-1996 and JP-B-63-26286, when the wiring is cut off, an alarm is sounded until the power supply line to the alarm device is cut off due to its structure. . For this reason, the alarm will continue to sound even after the person who tried to steal the vehicle has gone away for the alarm. Become very annoying in the neighborhood. If the power consumption of the alarm device is large, the battery may be dead.

Further, the anti-theft device described in Japanese Utility Model Laid-Open No. 60-71996 has a cost reduction because an auxiliary battery is used in order to realize a control for sounding an alarm when the control line is disconnected. In addition to the increase, the alarm device does not operate when the capacity of the auxiliary battery is exhausted.

In the anti-theft device disclosed in Japanese Patent Application Laid-Open No. Hei 7-132796, when only one connector is disconnected, a microcomputer provided inside the control device "sounds an alarm" and "stops the alarm." Can be controlled, but if all the connectors are disconnected, control cannot be performed because electricity is not supplied from the battery to the regulator in the control device. There is a drawback that the alarm keeps sounding until is shut off.

The anti-theft devices disclosed in Japanese Utility Model Laid-Open No. 60-71996 and Japanese Patent Application Laid-Open No. Hei 7-132796 have a dark current flowing through the control device for a long time (for example, several months). Even if the anti-theft device is not used, power is consumed and the battery runs down. Therefore, an operation such as disconnecting a power supply line to prevent the battery from running down was required.

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and when a wiring between a control unit and an operation unit is disconnected, an alarm is sounded for a predetermined time and a warning is issued to a neighborhood. The purpose is to avoid major inconvenience. Another object of the present invention is to make it possible to continue the anti-theft operation even when the wiring between the control unit and the operation unit is disconnected.

[0012]

In order to achieve the above object, a vehicular anti-theft device according to the present invention detects an abnormality of a vehicle based on an output signal of a sensor for detecting an impact or the like acting on the vehicle. A control unit having an abnormality detection circuit that activates an alarm to generate an alarm, and is formed separately from the control unit and connected to a power supply via the control unit, and sets the control unit to an operating state. A vehicle anti-theft device having a settable operation unit, wherein a line disconnection detecting unit that detects that a line connecting the control unit and the operation unit is disconnected and provides a line disconnection signal to the abnormality detection circuit When the abnormality detection circuit detects that the wiring is disconnected based on an output signal of the wiring disconnection detecting unit, the abnormality detection circuit activates the alarm device for a predetermined time to generate an alarm. Features.

The wiring disconnection detecting section is connected to the wiring, one of which is disposed in the control section, and the other of which is disposed in the operating section, and can be a resistor for applying a divided voltage to the abnormality detecting circuit. In addition, even after the disconnection of the wiring,
The operation of the alarm can be controlled based on the output signal of the sensor to prevent theft.

[0014]

According to the present invention constructed as described above, an alarm is sounded for a predetermined time (for example, 30 to 60 seconds) when the wiring connecting the control unit and the operation unit is cut off. Evacuate the person who tried to steal the car, and even if there is no owner near the car, the alarm will not beep and the neighborhood will not be disturbed so much Can be prevented.

The wiring disconnection detecting section is formed by a wiring connecting the control section and the operating section, and a resistor for dividing and applying a voltage to an abnormality detecting circuit connected to the wiring, thereby providing an expensive switching circuit. It is not necessary to provide a new wiring or the like, and the circuit can be simplified. Further, since power is supplied to the operation unit via the control unit,
It is possible to supply power to the control unit even when the wiring between the control unit and the operation unit is disconnected, and even after the disconnection of the wiring, the abnormality detection circuit controls the alarm based on the output signal of the sensor. An alarm can be generated, and theft of the vehicle can be reliably prevented.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a vehicle antitheft device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is a schematic configuration diagram of the vehicle theft device according to the embodiment of the present invention. In FIG. 2, the anti-theft device 1
Numeral 0 designates the operation unit 12, the control unit 14, and the alarm 16 as main components. The operation unit 12 sets the control unit 14 in an operation state, as will be described in detail later. The operation unit 12 is mounted on, for example, a handle post 22 in the passenger compartment 18 so that a driver can easily operate the control unit 14. Further, a control unit 14 which will be described in detail later, and an alarm 16 which generates an alarm are
It is attached to the back side of the dashboard 22 outside the device 8 so that it cannot be easily removed. The operation unit 12 and the control unit 14 are connected by a control line (wiring) 24 partially exposed in the passenger compartment 18, and the control unit 14 and the alarm device 16 are connected by an alarm line 26. I have.

In the anti-theft device 10, the control unit 14 is connected in parallel to the power supply wiring on the back side of the dashboard 22 or the key switch wiring on the back side of the key cylinder.
The vehicle is connected to a vehicle battery as a power source through these wires.

The control unit 14, as shown in FIG.
U30. The CPU 30 forms an abnormality detection circuit, detects that an abnormality has occurred in the vehicle based on an output signal of a sensor such as the impact sensor 28, and sends an operation control signal to the alarm device 16 via a signal line 29. Output. The anti-theft device 10 can perform operation setting and operation cancellation by radio, and a receiver 34 that receives a command signal output from the transmitter 32 and gives the command signal to the CPU 30 is provided in the control unit 14. And the anti-theft device 10
As will be described in detail later, the transmitter 32 is connected to a vehicle battery 38 via an ignition switch (IG) 36 so that the operation can be canceled when the transmitter 32 is forgotten or lost. Is supplied.

That is, the fixed terminal of the ignition switch 36 is connected to the positive terminal of the battery 38, and the anode of the reverse connection preventing diode 40 provided in the control unit 14 is connected to this fixed contact. And
The movable contact of the ignition switch 36 includes a controller 1
4, the base of the transistor 42 is connected via a resistor 44. The transistor 42 supplies an operation release signal to the CPU 30 as described later. The transistor 42 has a collector connected to the CPU 30 and a regulator 4 provided in the control unit 14 via a pull-up resistor 46.
8 is connected to the output side. Also, the transistor 42
Has a resistor 50 connected between the grounded emitter and the base, so that the output voltage of the battery 38 divided by the resistor 44 and the resistor 50 is supplied to the base.

The base of a transistor 54 is connected to the cathode of the reverse connection preventing diode 40 via a pull-up resistor 52. The transistor 54 forms a switching circuit for turning on and off the regulator 48 together with the P-channel FET 56, and the collector is P
It is connected to the gate of the channel FET 56, is connected to the cathode of the diode 40 via the pull-up resistor 58, and the emitter is grounded. And
The P-channel FET 56 has a source connected to the cathode of the diode 40 and a drain connected to the input side of the regulator 48. The regulator 48 converts the voltage of the vehicle battery 38 input via the P-channel FET 56 and the reverse connection preventing diode 40 into a constant voltage _Vcc and outputs the same. 12 and a circuit power supply.

That is, the operation section 12 is connected to the output side of the regulator 48 via the wiring 24a constituting the control line 24. The operation unit 12 includes a power switch 60 for turning on the control unit 14 to turn on the power, and an operation switch 62 for setting the control unit 14 to generate an alarm when the control line 24 is disconnected. A plurality of function setting switches (not shown) that can set various functions to 14 and a light-emitting unit (FIG. 7) made up of LEDs for notifying the surroundings by blinking that the anti-theft device 10 is operating and preventing theft. (Not shown) and the like as main components.

The power switch 60 is a normally-closed switch, and has a fixed contact whose wiring 24 b forms the control line 24.
Is connected to the base of the transistor 54 of the controller 14 via The movable contact of the power switch 60 is connected to the control unit 24 via a wiring 24d forming the control line 24, and is grounded. Then, the power switch 60
Can be operated only by a hidden switch or a special tool, so that it cannot be easily operated by a third party.

On the other hand, the operation switch 62 is an automatic reset type push button switch, and is turned on only when pressed down. One fixed contact of the operation switch 62 is connected to the regulator 4 via the wiring 24a.
8 is connected to the output side. The other fixed contact of the operation switch 62 is connected to one terminal of a capacitor 66 constituting a differentiating circuit 64 and a resistor 68.
The other terminal of the capacitor 66 is connected to the control unit 14 via a wiring 24c forming the control line 24, and further connected to an input terminal 71 of the CPU 30 via a wiring 70 in the control unit 14. One end of a resistor 72 disposed in parallel with the resistor 68 is connected to the other terminal of the capacitor 66. The other end of the resistor 72 is grounded on the control unit 14 side via the wiring 24d together with the other end of the resistor 68.

The wiring 70 in the control unit 14 connected to the input terminal 71 of the CPU 30 is connected to the output side of the regulator 48 via a resistor 74 and to the cathode of a diode 76 whose anode is grounded. . The resistor 74, together with the wire 24c and the resistor 72 on the operation unit 12 side, constitutes a wire disconnection detecting unit 76, as will be described in detail later.
The resistor 74 and the resistor 72 of the output voltage _Vcc of the regulator 48
Is divided by the input terminal 71 of the CPU 30.
To be entered.

In this embodiment, if the resistance value of the resistor 72 is R, the resistance value of the resistor 74 is 20R. The resistance of the differentiating circuit 64 is (1/10) R. Further, the alarm 16 is connected to the battery 38 via the control unit 14, and the battery voltage Vb is applied during operation.

The operation of the embodiment configured as described above is as follows. When the power is off, the antitheft device 10 is in a state where the power switch 60 of the operation unit 12 is closed (short). Therefore, the base of the transistor 54 of the control unit 14 is grounded via the wiring 24b, the power switch 60, and the wiring 24d, and is turned off because the base voltage is at the L level. Therefore, the voltage of the battery is applied to the gate of the P-channel FET 56 via the pull-up resistor 58, and the P-channel FET 56 is turned to the H level and turned off, so that no current flows to the regulator 48.

On the other hand, when the power switch 60 of the operation unit 12 is turned on (open), the voltage of the battery is applied to the base of the transistor 54 via the pull-up resistor 52 to be at the H level, and the transistor 54 is turned on. And the collector and the emitter conduct. Therefore, the P-channel FET 56 is turned on when the gate voltage becomes L level, and the regulator 48
, And converts the input battery voltage to _Vcc and outputs it. Thereby, C
The PU 30 is supplied with power and enters an operating state, and starts the processing of the flow illustrated in FIG.

When the power switch 60 is turned on,
Normally, the voltage at the point B divided by the _Vcc resistance 74 and the resistance 72 is input to the input terminal 71 of the PU 30 via the wiring 70. In the case of the embodiment, since the resistance of the resistor 74 is 20R and the resistance of the resistor 72 is R, C
The voltage input to the input terminal 71 of the PU 30 is (1/21)
_Vcc . Then, the CPU 30 proceeds to step 8 in FIG.
As shown in FIG. 0, when the voltage input to the input terminal 71 is monitored and a normal (1/21) _Vcc is input, B
The program determines that the voltage at the point is at the L level, terminates this program, and executes another routine.

Next, when the operation switch 62 is depressed to cause the CPU 30 to monitor the disconnection of the control line 24, the output voltage of the regulator 48 is led to the point A in FIG. Only when the button 62 is pressed, the level becomes the H level as shown in FIG. Then, a current flows through the differentiating circuit 64 to charge the capacitor 66, a voltage as shown in FIG. 4B is induced at the point B via the wiring 24c, and an H-level voltage is applied to the input terminal 71 of the CPU 30. Is entered. As shown in FIG. 4C, the CPU 30 generates a pulse having a time width exceeding a predetermined threshold voltage _Vth from the voltage waveform appearing at the point B as shown in FIG. Then, the process proceeds to step 82, where it is determined whether the H level time is longer than a predetermined time. For example, when the pulse width output at point C is 100 msec when the operation switch 62 is pressed down, the predetermined time is 20 minutes.
Set to a value such as 0 msec or more.

If the H level time is shorter than the predetermined time (eg, 200 msec) in step 82, the CPU 30 determines that the operation switch 62 has been operated, proceeds to step 84, performs a predetermined operation, and ends the program. . If the voltage at the point B has been kept at the H level for a predetermined time or longer, the CPU 30 determines that the control line 24 has been disconnected, proceeds from step 82 to step 86, and outputs an alarm signal via the signal line 29. An operation signal is output to 16 to generate an alarm, and the person trying to steal the car is evacuated. That is, when the wiring 24c forming the control line 24 is disconnected, the voltage at the point B becomes equal to the resistance 74 and the resistance 7 of the _Vcc.
Which was divided by 2 is changed to a value lower by a voltage drop due to the pull-up resistor 74 of V _cc, CPU
An H level voltage is always input to the input terminal 71 of the input terminal 30.

When the control line 24 is disconnected, the power switch 60 of the operation unit 12 is disconnected from the control unit 12. However, the base of the transistor 54 is connected to the battery 38 via the pull-up resistor 52 and the diode 40, and the ON state is maintained because the base voltage becomes H level. Therefore, since power is supplied to the regulator 48, the power of the control unit 14 is secured, and the operation is continued.

When the CPU 30 gives the operation signal of the alarm 16, the CPU 30 determines whether or not the ignition switch (IG) 36 is turned on (step 88). The ignition switch 36 is for stopping the operation of the anti-theft device 10 when the transmitter 32 is forgotten or lost. When the ignition switch 36 is turned on, an L level voltage is input from the transistor 42 to the CPU 30. ,
The alarm is stopped. That is, when the ignition switch 36 is off, the transistor 42 is off because the base voltage is low, and the collector voltage is high due to _Vcc applied via the pull-up resistor 46. Are input to the CPU 30. However, when the ignition switch 36 is turned on, the transistor 50 is turned on because the battery voltage is applied to the base via the resistor 44, and the collector and the emitter conduct, so that the collector voltage becomes L level. When the L level is input from the transistor 50, the CPU 30 proceeds from step 88 to step 94, and gives an operation stop signal to the alarm device 16 to stop the alarm.

If the ignition switch 36 has not been turned on, the CPU 30 proceeds from step 88 to step 90, and determines whether or not an alarm canceling command has been given from the transmitter 32.
The process proceeds to step 4 to stop the alarm, and if no alarm cancel command is given, the process proceeds to step 92. In step 92, it is determined whether or not a predetermined time (for example, 30 seconds) has elapsed since the activation of the alarm device 16. If the predetermined time has not elapsed, the process returns to step 86 and returns to steps 86 to 86.
Step 92 is repeated. When it is determined in step 92 that the predetermined time has elapsed since the activation of the alarm 16, an operation stop signal is given to the alarm 16 to stop the alarm (step 94). Thus, it is possible to avoid trouble in the neighborhood caused by the alarm 16 being kept ringing, and also possible to prevent the battery from running out.

When the alarm by the alarm 16 is stopped, the CPU 30 checks whether or not the voltage at the point B is at the H level (step 96).
4 is in a standby state until it is restored. And control line 2
When 4 is restored and the voltage at point B becomes L level, this program is terminated and the routine returns to the normal routine.

As described above, in the embodiment, when the control line 24 is disconnected, the alarm 16 generates an alarm for a predetermined time, so that the owner of the car is not near. Without bothering the neighbors,
Battery rising can be prevented. In addition, a resistor 74 provided in the control unit 14 with the wire disconnection detection unit 76, a resistor 72 provided in the operation unit 12, and these resistors 74, 72
, The circuit can be simplified without requiring an expensive switch circuit or new wiring. Then, the power of the control unit 14 is turned on by a power switch 60 provided on the operation unit 12,
Because it can be turned off, even if the anti-theft device 10 is not used for a long time (for example, for several months),
Battery rising can be prevented.

Even when the control line 24 is disconnected, the power supply of the control unit 14 is secured and the CPU 30 as the abnormality detection circuit is in the operating state as described above. Also in this case, the vehicle 30 can be more reliably prevented from being stolen by causing the CPU 30 to continue the anti-theft operation based on the output signal of the sensor such as the impact sensor 28.

[0037]

As described above, according to the present invention, when the wiring connecting the control unit and the operation unit is disconnected, an alarm is sounded for a predetermined time,
Evacuates the person who attempted to steal the car, and even if there is no owner near the car, the alarm does not stay on, so there is no major inconvenience in the neighborhood and the battery does not run out can do.

The wiring disconnection detecting section is formed by the wiring connecting the control section and the operating section, and the resistor which divides the voltage and applies the voltage to the abnormality detecting circuit connected to the wiring, thereby providing an expensive switching circuit. It is not necessary to provide a new wiring or the like, and the circuit can be simplified. Further, since power is supplied to the operation unit via the control unit,
It is possible to supply power to the control unit even when the wiring between the control unit and the operation unit is disconnected, and even after the disconnection of the wiring, the abnormality detection circuit controls the alarm based on the output signal of the sensor. An alarm can be generated, and theft of the vehicle can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a vehicle anti-theft device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a vehicle anti-theft device according to an embodiment of the present invention.

FIG. 3 is a flowchart illustrating an operation of the vehicle anti-theft device according to the embodiment;

FIG. 4 is a time chart illustrating an operation of a control unit when an operation switch of an operation unit of the vehicle antitheft device according to the embodiment is operated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Anti-theft device 12 Operation part 14 Control part 16 Alarm 24 Wiring (control line) 28 Sensor (shock sensor) 30 Abnormality detection circuit (CPU) 32 Transmitter 34 Receiver 36 Ignition switch 38 Battery 48 Regulator 48 Power switch 62 Operation Switch 64 Differentiator 76 Wiring disconnection detector

Continued on the front page (72) Inventor Koichi Koizumi 72 Enokicho, Shinjuku-ku, Tokyo F-term in Carmate Co., Ltd. 5C084 AA04 AA09 BB31 CC08 DD75 DD79 DD80 EE06 FF02 GG03 GG13 GG19 GG33 GG43 GG55 GG56 GG57 GG62 GG68 H05 HH08

Claims (3)

[Claims] 1. A control unit comprising an abnormality detection circuit for detecting an abnormality of a vehicle based on an output signal of a sensor for detecting an impact or the like acting on the vehicle and activating an alarm to generate an alarm, and A vehicle anti-theft device having an operation unit formed separately from the unit and connected to a power supply through a control unit and capable of setting the control unit to an operation state, wherein the control unit and the operation unit are A wiring disconnection detection unit that detects that the wiring to be connected is disconnected and provides a wiring disconnection signal to the abnormality detection circuit, wherein the abnormality detection circuit disconnects the wiring based on an output signal of the wiring disconnection detection unit; An anti-theft device for a vehicle, characterized in that when detecting that the alarm has been performed, the alarm is activated for a predetermined time to generate an alarm. 2. The wiring disconnection detecting section is connected to the wiring, one is disposed in the control section, and the other is disposed in the operation section and is a resistor for applying a divided voltage to the abnormality detecting circuit. The anti-theft device for a vehicle according to claim 1, wherein: 3. The alarm detection circuit according to claim 1, wherein the abnormality detection circuit is configured to control the operation of the alarm based on an output signal of the sensor even after the disconnection of the wiring. A vehicle theft device according to claim 1.