JPH0211439A - Device for preventing theft of automobile - Google Patents

Abstract

PURPOSE:To surely prevent the theft of an automobile by providing a transmitter which sends out a locking signal for locking the door of the automobile, and carrying out the locking of the door while forwardly collapsing the back portion of a driver's seat on receiving the locking signal. CONSTITUTION:A remote-control transmitter 3 for repeatedly generating locking/ unlocking signals each time a push button switch 31 is pressed is provided on the captioned device while providing a control device 2 for receiving transmit ted signals on an automobile side. The control device 2 judges whether the code signal in the control signal from the transmitter 3 agrees with the code signal of its own and, when both signals agree, it locks a locking device 12 if the locking device 12 is in an unlocked condition. Then, it drives a motor M1 to advance the seating portion of a seat and then drives a motor M2 to forwardly collapse the back portion of the seat, thereby, preventing seating on the driver's seat. Further, when the detection of theft is carried out in this condition, electrification to the motors M1, M2 is cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an anti-theft device for a motor vehicle that remotely controls the locking of a door of a motor vehicle and angularly displaces the backrest of a driver's seat.

2. Description of the Related Art As a device for preventing theft of an automobile, it has been common to install various detection switches or sensors on the automobile, detect changes to the automobile at the time of theft, and output an alarm to prevent theft. Such an anti-theft device essentially requires extremely high reliability of the various detection switches or sensors, and it is necessary to maintain constant operation of the various detection switches or sensors over a long period of time. Furthermore, even if various anti-theft devices are installed, the theft detection logic of the anti-theft devices will eventually be deciphered, and theft will easily occur on the spot.

Problems to be Solved by the Invention As mentioned above, in conventional antitheft devices, if the theft detection logic of the antitheft device is deciphered, it becomes impossible to prevent theft, and the driver cannot understand the theft prevention logic. It is generally difficult to know whether or not a third party has decoded the data. Therefore, in order to completely prevent car theft, the anti-theft logic should be set up like a traditional device,
When a situation that conforms to this logic occurs, a device that determines that theft has occurred cannot be expected to be perfect.

An object of the present invention is to effectively prevent theft of a car by creating a situation in which even if a third party intrudes into the vehicle interior and attempts to steal the car, he or she cannot drive the car. An object of the present invention is to provide an anti-theft device.

Problems and Means for Solving the Problems The present invention provides a system in which the backrest of a driver's seat of an automobile is driven for angular displacement by a driving source, the backrest is configured not to be angularly displaced by external force, and the doors of the automobile are locked. a transmitter that sends out a locking signal to lock the door; a locking device that receives the locking signal and locks the door; and a locking device that drives a drive source in response to the locking signal to tilt the backrest portion forward. A theft prevention device for an automobile is characterized in that it includes a control means.

In the present invention, when a locking signal for locking the door of the automobile is sent from the transmitter, the door of the automobile is locked, and in response to the locking signal, the backrest of the driver's seat of the automobile is The backrest portion is moved forward and the backrest portion is angularly displaced forward.

Embodiment FIG. 1 is an electrical block diagram of an automobile anti-theft device which is an embodiment of the present invention. The anti-theft device 1 includes a control device 2 and the like mounted on the body of an automobile, and a transmitter (hereinafter referred to as "remote control transmitter") 3 that controls the control device 2 and the like by remote control. The remote control transmitter 3 is, for example, a transmitter about the size of a notebook, and can be carried in a boget or the like. The remote control transmitter 3 is provided with a transmission push button switch 31 for locking/unlocking the door locking device. When the transmission push button switch 31 is pressed, the transmission signal generated by the oscillation circuit 32 is activated. , is sent to the control device 2 via the transmitting antenna 33. Each time the transmission push button switch 31 is pressed, the locking device 4 repeats locking/unlocking. Oscillation circuit 32
generates a carrier wave of a predetermined frequency, a code signal for specifying this anti-theft device 1 and preventing interference with other anti-theft devices is superimposed on this carrier wave, and is sent to the transmitting antenna 33.

A transmission signal sent from the remote control transmitter 3 is received by the reception antenna 4 and input to the reception circuit 21.

The receiving circuit 21 extracts the control signal superimposed on the transmission signal and sends it to the processing circuit 22.

The power switch 5 is a power switch 1 installed in a car.
The battery voltage supplied via the power switch 5 is converted by the power supply circuit 23 into a voltage used within the control device 2 .

The manual control switch 6 is a manual switch that adjusts the set position of the driver's seat, and is composed of a switch that adjusts the front and back of the seat, and a switch that adjusts the angular position of the backrest.

The vibration sensor 8 is, for example, an acceleration sensor fixed to the vehicle body, and detects vibrations of the vehicle body, and sends the vibration signal to the input circuit 2.
Give to 4.

The actuator 9 that locks/unlocks the door locking device is provided with a sensor that detects the locked/unlocked state of the locking device, and the output of the sensor is given to the input circuit 24 via the signal line S11. .

The input circuit 24 inputs signals from the manual control switch 6 , curtain switch door lock/unlock detection switch 7 , vibration sensor 8 , and actuator 9 , shapes the waveforms, and sends the signals to the processing circuit 22 . The processing circuit 22 is composed of a microcomputer or the like, and when the control signal sent from the receiving circuit 21 is input, it extracts the code signal from the control signal and combines it with its own code signal stored in the processing circuit 22. It is determined whether there is a match or a cup.

If they match, the processing circuit 22 inputs a lock/unlock signal;
If the signal is a signal indicating that the lock should be unlocked, the locking device 1 is sent to the control relay drive circuit 26 via the signal line s14.
A locking control signal is sent to lock 2. Further, when the lock/unlock signal is a signal representing a locked state, the processing circuit 22 sends a signal line sZ to the control relay drive circuit 26.
5, an unlock control signal for unlocking the locking device 12 is sent out. The control relay drive circuit 26 operates the control relay 10 based on the locking/unlocking control signal sent from the processing circuit 22, and operates the locking device 1 by the actuator 9.
Perform the lock/unlock operation in step 2.

The motor drive circuit 25 controls the position of the driver's seat and backrest based on the control signal sent from the processing circuit 22. In other words, the motor drive circuit 25 controls the position of the driver's seat and backrest based on the control signal sent out from the processing circuit 22. That is, the motor drive circuit 25 controls the seat position control sent out via the signal line s12. The signal drives the motor M1 to move the seat forward. Also, the signal line s
Based on the backrest angle control signal sent through 13, the motor M2 is driven to control the amount of angular displacement of the backrest.

The relay drive circuit 26 locks f2/of the door locking device 12.
Control relay 1 for controlling actuator 9 for unlocking
An excitation current is supplied to the coil provided in 2. That is, the actuator 9 locks the lock device 12 based on the locking control f3 sent from the processing circuit 22 via the signal line s14, and based on the unlocking control signal sent via the signal line s15, The actuator 9 brings the locking device 12 into the unlocked state.

The power cutoff circuit 27 sends a control signal to the motor drive circuit 25 to cut off the power supplied to the motors that control the positions of the driver's seat and backrest when the control device 2 detects that the vehicle is stolen. This is the circuit that sends the signal to.

FIG. 2 is a side view of the seat for explaining position control of the driver's seat. A threaded rod 31 connected to the rotating shaft of the motor eight 1 and a nut 3 screwed together
2 is fixed to the seating portion 33 of the seat, and when the threaded rod 31 is rotated by the motor M1, the nut 32 moves, and the position of the seating portion 33 is displaced accordingly. Further, a worm gear 34 connected to the rotating shaft of the motor M2 and a pinion gear 36 fixed to the backrest portion 35 mesh with each other. Therefore, when the worm gear 34 is rotated by the motor M2, the pinion gear 36 is rotated.
Accordingly, the angle of the backrest portion 35 is displaced.

FIG. 3 is a side view of the automobile for explaining the movement of the seat when the locking device is locked. When the locking device 42 for locking/unlocking the car door 41 is in the unlocked position, the seat portion 4B and the backrest portion 4 of the seat are locked.
4 is in a state where it is possible to drive a car. When the locking device 42 is locked, the seat 43 moves forward and is set at the seat 45σ) position, and the backrest 44 is in almost contact with the steering wheel 47. The state becomes 46. In this way, the locking device・12
When the vehicle is locked, the seat is set in a position that does not allow the driver to drive the vehicle, allowing a third party to enter the vehicle interior and become unable to drive the vehicle even if the driver wishes to do so. Become.

FIG. 4 is a flowchart for explaining the operation of the anti-theft device according to the present invention. In the following, operations will be explained respectively in cases where theft has occurred and cases where theft has not occurred.

First, the locking/unlocking operation of a car door when no theft has occurred will be explained. In step rr 1,
When the processing circuit 22 receives a control signal from the remote control transmitter 3, the identification signal included in the control signal is transmitted to the processing circuit 22.
It is determined whether the identification signal matches the own identification signal stored in the internal memory. When the wholesale signal is received, the process proceeds to step rI2, and it is determined whether the door is currently locked or unlocked based on the locking/unlocking operation from the actuator 9.The door is unlocked. The place is step n
3, the processing circuit 22 sends a locking signal to the control relay drive circuit 26 via the signal line s14, causing the actuator 9 to perform the direction locking operation.

When the door is locked, the process proceeds to step n4, where security is set. This security set is a process for setting a process in the processing circuit 22 for determining whether or not theft has occurred based on the signal from the vibration sensor 8. Proceed from step n4 to step n5,
The processing circuit 22 provides a control signal for advancing the seating portion 33 of the seat to the motor drive circuit 25 via the signal line s12, and the motor drive circuit 25 drives the motor M1 to advance the seating portion 33. In addition, the processing circuit 22
provides a backrest control signal to the motor driver i\825 via the signal line s13 in order to tilt the backrest portion forward. The motor drive circuit 25 drives the motor M2 based on the backrest control signal.

The seating portion 33 of the seat moves forward, and the backrest portion 35
If it is brought forward, the process proceeds to step rI6, where it is determined whether or not a control signal has been received from the remote control transmitter 3. If the control signal has not been received, the process proceeds to step n7, where it is determined whether or not theft has occurred. The criteria for determining the occurrence of theft are whether the door was opened in an unauthorized manner,
It is determined that theft has occurred when the door lock is released or a signal from the vibration sensor 8 indicating that some vibration has occurred in the vehicle body is received. step rr
If it is determined in step 7 that no theft has occurred, the process advances to step n6 and waits for a control signal from the remote control transmitter 3 to be received. control from the remote control transmitter 3 (when the wholesale signal is received, step rr 6
The process then proceeds to step rt2, where the locked/unlocked state of the door is determined, and since the door is locked, the process proceeds to step n8.

In step rI8, the door is unlocked.

That is, the processing circuit 22 via the signal line s15,
An unlocking control signal is sent to the control relay drive circuit 26 to unlock the actuator locking device 12. When the door is unlocked, the process proceeds to step r19, where it is determined whether or not theft is occurring. That is, it is determined whether the flag set when theft occurs is a flag indicating that theft has occurred, and if theft is not occurring, step n1 is performed.
0, and a security reset is performed in step nlo. When the security reset is performed in step r110, the process proceeds to step nil, where the seat portion 33 and backrest portion 35 of the seat are returned to their original positions.
l An action of 4m is performed. In step nil, the seat returns to its original position, allowing the vehicle to be driven.

Next, the processing circuit 22J when a car theft occurs)
In 6 steps r17, which will be explained below, if the door is opened in an illegal manner, the door lock is released, or a signal that the vehicle body vibrates is received from the vibration sensor 8, it is determined that the vehicle has been stolen. , processing circuit 2
A flag indicating that theft has occurred is set in the memory of the motor M2, and at step r112, the motor M controls the seat portion 33 and backrest portion 35 of the seat.
1. Tr supplied to M2: shut off the source. That is,
The processing circuit 22 sends a control signal to the power cutoff circuit 27, and the power cutoff circuit 27 performs an operation f% on the motor drive circuit 25 to cut off the power line that supplies the motors M1 and M2.

In step n12, motor M1. When the power to M2 is cut off, the process proceeds to step rI6, where it is determined whether a control signal from the remote control transmitter 3 has been received. Upon receiving the control signal, step n6 to step r+2
Then, the locked/unlocked state of the door is determined. Since the door is locked, the process proceeds to step n8, where the door is unlocked.

Then, the process advances to step n9, where it is determined whether or not theft is currently occurring. That is, it is determined whether or not the theft occurrence flag stored in the memory of the processing circuit 22 is set, and if the theft is occurring, step r+ is executed.
The process advances to step 13, and the state is restored to the state where the power for driving the motor MIM2 is supplied.

Thereby, the vehicle can be operated in a state π in which the vehicle can be driven.

The reason why the power supply to the motors Ml and M2 is restored even though theft is occurring in step r113 is because the control signal from the remote control transmitter 3 has been received.
This is because it is possible to determine that no control signal from the owner of the vehicle has been received, so it is necessary to restore the five seats to their original state and make them ready for driving.

As described above, when the remote control transmission [3 is used to lock the seat, the seat is set to a state where it cannot be driven, and when the occurrence of theft is detected, the power supplied to the motor that returns the seat to its original position is turned off. Since the remote control transmitter is cut off, those who do not have the remote control transmitter cannot restore the vehicle to a drivable state. Therefore, the theft of the vehicle can be more reliably prevented.

In the control flowchart shown in Fig. 4, the power for driving the motor is cut off after detecting the occurrence of theft. , an operation may be performed to cut off the motor drive power source.

Furthermore, when the occurrence of theft is detected, the movement of the vehicle can be more reliably prevented by flashing the headlights or sounding the horn.

Effects of the Invention As described above, according to the present invention, the backrest of the driver's seat of the automobile is configured so as not to be angularly displaced by external force, so that a third party cannot enter the interior of the vehicle in order to steal the vehicle. Even if you are unable to drive, you can definitely prevent theft of your car.

[Brief explanation of the drawing]

FIG. 1 is an electrical block diagram of an automobile theft prevention device which is an embodiment of the present invention, FIG. 2 is a side view of the automobile seat for explaining the position control of the automobile seat, and FIG. 3 is a diagram showing the locking device. A side view of the automobile for explaining the movement of the seat when the seat is locked, and No. 4 (2I is a flowchart for explaining the movement of the anti-theft device according to the present invention. 1. Anti-theft) Device, 2...Control device, 3...Remote control transmitter, 7...Curtain switch door lock/
Unlock detection switch, 8... Vibration sensor, 9...
・Actuator, 10... Control relay, 33...
Seat part, 35...Backrest part, Ml, M2...Motor agent Patent attorney Keibu Saikyo Figure 1

Claims (1)

[Scope of Claims] The backrest of a driver's seat of an automobile is driven for angular displacement by a driving source, and the backrest is configured so as not to be angularly displaced by external force, and the doors of the automobile are locked. a transmitter that sends out a locking signal for the lock; a locking device that receives the locking signal and locks the door; and a control that drives a drive source in response to the locking signal and tilts the backrest portion forward. An anti-theft device for an automobile, characterized in that it includes means.