JPH02133269A - Burglarproof device for vehicle - Google Patents

Abstract

PURPOSE:To surely prevent a vehicle from its burglary by providing a transmitter, carried by a driver, and a receiver, set up in the vehicle, operating the transmitter from the outside of the vehicle and enabling the receiver in a side of the vehicle to generate a stop signal through a radio wave. CONSTITUTION:A vehicle burglarproof device is provided with a transmitter, carried by a driver, and a receiver set up in a vehicle. When the vehicle is robbed, the driver, by operating the transmitter in the outside of the vehicle, transmits a signal code for stopping the vehicle. This transmitted signal code, in order to prevent misoperation of the device, is a signal code which can be discriminated from the ordinary radio wave. The receiver, when it receives this signal code, generates a stop signal, and being based on this signal, a non- volatile keep relay operates continuously cutting off thereafter a main power source of the vehicle. Accordingly, the vehicle, being placed in a stop condition, can be surely prevented from the burglary.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for preventing theft of vehicles such as cash transport vehicles, precious metal transport vehicles, bails, or general passenger cars.

[Conventional technology]

There are many incidents where cash transport vehicles are attacked and the entire vehicle is stolen. These cash transport vehicles are constantly targeted by criminals, and various crime prevention efforts are currently being taken to ensure that cash and valuables are transported safely and reliably to their destinations, while always exposing themselves to danger. There is.

For example, a vehicle is equipped with a theft notification device, and in the event of an emergency, it can manually issue an alarm, send a wireless report to the police, or stop the vehicle's engine.

[Problem to be solved by the invention]

However, performing such an operation when a driver is being pointed at a weapon can not necessarily be said to be effective, as it can irritate the criminal even more and may result in damage that could be life-threatening.

Furthermore, if the driver or the like is away from the vehicle, the above-mentioned device is completely useless.

The present invention has been made in view of these conventional problems, and it is possible to switch off an alarm device or a vehicle stop device installed in a vehicle without touching a switch installed inside or outside the vehicle. The purpose is to operate.

[Means to solve the problem]

In order to achieve this object, the vehicle anti-theft device of the present invention includes a transmitter carried by a driver or a passenger of the vehicle and a receiver installed in the vehicle, and the transmitter is equipped with The receiver includes a signal generation circuit that transmits a specific coded signal, a modulator that modulates this signal, and a transmitting antenna that outputs the modulated high frequency as a radio wave. a receiving antenna that receives the received radio waves; a demodulator that demodulates the received radio waves into the original signal transmitted from the signal generation circuit; and a demodulator that converts the signal demodulated by the demodulator into a preset specific code signal. A discrimination circuit that determines whether there is a match, a self-holding circuit that holds the matching signal when there is a match, and a nonvolatile type that is set by the self-held matching signal, that is, it remains set even when the power is turned off. The vehicle has a key relay of a type that stores the key relay, an output circuit that cuts off power to the ignition system of the vehicle by closing a contact of the key relay, and a reset circuit that releases the set state of the key relay. It is characterized by:

Furthermore, by adding a circuit that flashes the vehicle's emergency warning light and generates a horn before shutting off the power to the vehicle's ignition system, it is possible to reduce the criminal's desire to continue committing the crime before the vehicle is stopped.

Furthermore, by adding a circuit for locking the vehicle door and/or the trunk door, it is possible to make it impossible for the criminal to escape or to take out cases containing cash or valuables from the trunk.

Instead of shutting off power to the vehicle's ignition system by closing the contacts of the keep relay, the vehicle can be stopped by tightening the vehicle's fuel cut-off solenoid valve or by changing the timing of fuel injection in the engine. .

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a transmitter of the present invention,
FIG. 2 is a block diagram showing a schematic configuration of the receiver.

First, in FIG. 1, numeral 1 is a call button, which enters the sending state only when pressed. - When pressed twice, a series of signals is generated, but in order to prevent malfunctions, the configuration is such that even if the button is pressed continuously, an unmodulated signal containing only the carrier signal is generated. The signal generator 2 generates a series of signals only once when the send button 1 is pressed.

The signal is a digital signal expressed at one of two levels, zero level and high level, and with 9 bits, it is possible to generate 512 coded digital signals (for example, rlloollol J). . This allows them to be distinguished from signals from other vehicles and radio signals. The digital signal from the signal generator 2 is input to the modulator 3 and undergoes frequency modulation.

Specifically, the capacitance that determines the oscillation frequency of the high frequency oscillation circuit 4 is changed. The high frequency oscillation circuit 4 uses a crystal oscillator to oscillate with high stability and maintains the center frequency before modulation.

It also outputs a frequency three times the fundamental frequency, and uses a tuning circuit to cut unnecessary frequency components. The high frequency amplifier 5 performs power amplification necessary to send the output of the high frequency oscillation circuit 4 to the transmitting antenna 6.

In FIG. 2, a signal from a receiving antenna 11 is input to a high frequency amplifier circuit 12, and only necessary signals are taken in by a tuning circuit. It also removes unnecessary radio waves at the same time as high frequency amplification. Field effect transistors (FETs) are used to prevent cross modulation. The first local oscillation circuit 13 oscillates a frequency that is 10.7 MHz different from the received frequency,
Outputs a frequency three times the fundamental frequency. It also prevents the generation of unnecessary radio waves.

The first mixing circuit 14 receives two types of frequencies by non-linear operation, always sends out the center frequency of 10.7 M I (z, and performs frequency conversion. It also performs amplification at the same time as frequency conversion, and It also serves as power amplification necessary for processing.1st
The intermediate frequency amplifier circuit 15 performs band amplification of 10.7 MHz±5 kHz using a filter and an amplifier circuit to remove unnecessary components. This frequency is determined by the first local oscillation circuit 1
Since there is a large difference between the frequency three times the fundamental frequency output in step 3, stable amplification is possible.

The second local oscillation circuit 16 has a frequency of 4 to 10.7 MHz.
This is a circuit that oscillates at frequencies with a difference of 55k)tz. A crystal oscillator is used to form a stable oscillation circuit without any adjustment. The second mixing circuit 17 receives the 10.7 MHz and second local oscillation circuit 16 signals, and receives the 455 kHz signal.
This is a circuit that converts 455kHz (Using a Z tuning circuit, unnecessary components are removed.The second intermediate frequency amplifier circuit 18 performs band amplification of 455kHz using a filter and an amplifier circuit.The low frequency and use of various stabilizing circuits allow for high amplification. The main gain is obtained in this part of the entire circuit.The detection circuit and signal shaping circuit 19 detects the frequency modulated high frequency signal of 455kHz.The frequency discrimination circuit detects only the low frequency signal. Take out.

This is a circuit that converts changes in frequency into changes in voltage. Correct the waveform to be the same as the output signal of the signal generator 2 of the transmitter.

Removes various noise signals and amplifies only the necessary signals.

The signal confirmation circuit 20 determines whether the received signal is the same as the instruction given to it. It has a sufficient time constant to prevent malfunctions due to noise, etc., and outputs only when a completely matched signal is received, and all others are turned off.

Once the signal is input, the self-holding circuit 21 becomes conductive and continues to hold the signal until the main power is turned off. The circuit does not recover unless the power supply, that is, the battery cable, is disconnected.

The signal processing circuit 22 sequentially applies outputs to various output circuits 23 at fixed intervals based on the signal from the self-holding circuit 21. It uses a magnetic holding relay and is equipped with a return circuit.

Once the output circuit 23 outputs an output using a magnetic holding relay, it continues to maintain the set state of the contacts even if the power is turned off. This output circuit 23 has the following functions.

■ Cuts off power to the ignition system and makes the vehicle inoperable. This causes the vehicle to stop.

■ Before cutting off the power to the ignition system, by flashing emergency warning lights or sounding alarms such as sirens, the criminal's actions are psychologically restrained and his motivation to continue the crime is reduced.

- Furthermore, by adding a circuit for locking the doors and the trunk door, it is possible to prevent the criminal from escaping the vehicle and also to make it impossible for the criminal to take out cash and valuables.

The usage and operation of this device will be explained below.

When a cash transport vehicle is attacked and the vehicle is stolen, the remaining driver takes out the transmitter and presses the button. The range of radio waves can be approximately 500 meters. As a result, the transmitter transmits radio waves with a preset signal code. A receiver mounted on a vehicle receives radio waves from a receiving antenna and determines whether the radio waves are of a preset signal code. This is necessary to prevent malfunctions caused by other radio waves.

If the radio waves are a signal code from a transmitter, the vehicle's emergency warning lights will flash and the siren will sound at the same time.

It also locks the doors and trunk door. After a few seconds, the ignition system loses power and the car stops.

In this way, the robbed cash transport vehicle or the like is stopped. This type of security device consists of an electronic circuit, so if you open the hood and disconnect the main fuse for the battery's main power supply, the alarm circuit will stop operating, and the power will be restored by reattaching the fuse. However, in this device, even if the TL source is turned off, the keep relay records the set state, so even when the power is turned on again, the ignition power system will not be turned on. I can't drive my car.

To properly reset the keep relay, you must first turn off the battery power, release the self-holding circuit from the self-holding state, turn on the power, and press the receiver's center button.

In the above example, the power to the ignition system is turned off to stop the vehicle, but in diesel engine vehicles, a cut solenoid valve installed in the supply path that supplies fuel to the engine is activated. The engine can also be stopped by cutting off the fuel supply. The engine can also be stopped by changing the timing of fuel injection to the engine.

Anti-theft devices can be installed in all vehicles, including cash transport vehicles, general passenger cars, and freight cars.

〔Effect of the invention〕

As described above, the present invention includes a transmitter carried by the driver and a receiver installed in the vehicle, and when the vehicle is stolen, the transmitter is operated from outside the vehicle to signal a stop signal by radio waves. The system is safe because the vehicle can be stopped without any danger to the driver or passengers. The transmitted radio waves are signal codes that can be distinguished from normal radio waves, and the receiver generates a stop signal only when it receives that signal code, so it prevents malfunctions such as the vehicle stopping due to other radio waves during normal operation. It can be prevented. Additionally, once a stop signal is received, the keep relay stores that signal in a non-volatile manner, so even if the vehicle's main power is turned off and then turned on again, the keep relay will not return to its operating state. Unable to start the vehicle
You can take all possible measures to prevent theft.

Further, by flashing the vehicle's emergency warning light or sounding the horn, it is possible to reduce the criminal's desire to continue committing the crime before the vehicle stops.

Furthermore, by adding a circuit for locking the vehicle door and/or the trunk door, it is possible to make it impossible for the criminal to escape or to take out cases containing cash or valuables from the trunk.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a transmitter in an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a receiver. 1: Transmission button 2: Signal generator 3: Modulator
4: High frequency oscillation circuit 5: High frequency amplifier
6: Transmitting antenna 11: Receiving antenna 12
: High frequency amplifier circuit 13: First local oscillation circuit 14: First mixing circuit 15: First intermediate frequency amplifier circuit 16: Second local oscillation circuit 17: Second mixing circuit 18:
Second intermediate frequency amplification circuit 19: Detection circuit 20: Signal confirmation circuit 21:
Self-holding circuit 22; Signal processing circuit 23: Output circuit Patent applicant Nix Co., Ltd.

Claims (5)

[Claims] 1. The transmitter includes a transmitter carried by the driver or passenger of the vehicle and a receiver installed in the vehicle, and the transmitter includes a signal generation circuit that transmits a specific coded signal by button operation, and a signal generation circuit that transmits a specific coded signal by button operation. and a transmitting antenna that outputs the modulated high frequency as a radio wave. A demodulator that demodulates the original signal transmitted from the circuit, a discrimination circuit that determines whether the signal demodulated by this demodulator matches a preset specific code signal, and a determination circuit that determines whether the signal demodulated by the demodulator matches a specific code signal set in advance. A self-holding circuit that self-holds a signal, a non-volatile keep relay that is set by the self-held coincidence signal, and an output circuit that cuts off the power to the vehicle's ignition system by closing the contacts of this keep relay. What is claimed is: 1. An anti-theft device for a vehicle, further comprising a reset circuit for releasing the set state of the keep relay. 2. 2. The anti-theft device for a vehicle according to claim 1, further comprising a circuit for blinking an emergency warning light of the vehicle and emitting a horn before cutting off power to the ignition system of the vehicle. 3. Claim 1 further comprising a circuit for locking the vehicle door and/or the trunk door.
Or the vehicle anti-theft device described in 2. 4. Claim 1: Instead of shutting off the power to the vehicle's ignition system by closing the contacts of the keep relay, the output circuit is configured to close the vehicle's fuel cut-off solenoid valve.
Anti-theft device for the vehicle mentioned. 5. 2. The anti-theft device for a vehicle according to claim 1, wherein instead of cutting off power to the ignition system of the vehicle by closing a contact of the keep relay, an output circuit is configured to remove the timing of fuel injection in the engine.