JPH09132116A - Anti-theft system of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-theft system capable of preventing burglar of a vehicle. SOLUTION: When a control means 30 detects that an ignition key is inserted into a key cylinder, the output of a lock signal or an unlock signal for a door, to be applied to a door lock control device 17 on the basis of the operation of a remote key 1 is prohibited by a prohibiting circuit 28, a normally opened contact 27b of a relay 27 is closed by the specified operation of the remote key 1 by an operation judging circuit 7, a fuel pump is made into a state where it can be operated, and normal starting of an engine is enabled. When the remote key 1 is operated while the engine is started, the normally opened contact 27b of the relay 27 is closed by a burglar prevention control circuit 29, an operating circuit of the fuel pump is cut, and the engine is stopped after the prescribed time or after traveling by the prescribed distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle antitheft device provided with a control means for locking or unlocking a door based on an operation of a remote key.

[0002]

Conventionally, in vehicles such as automobiles, when an ignition key is acquired by a person other than the owner, the engine can be started by a person who acquires the ignition key, which prevents the vehicle from being stolen. There is a risk. Further, if there is an intruder while the owner is in the vehicle and is starting the engine, the intruder can dismount the owner and drive the vehicle by himself, which may result in theft.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an antitheft device capable of preventing the theft of a vehicle.

[0004]

In order to achieve the above object, the vehicle antitheft device according to claim 1 is configured to execute a lock or unlock operation of a door based on an operation of a remote key. In the vehicle equipped with, when the ignition key is inserted into the key cylinder, the control means prohibits the locking or unlocking operation of the door based on the operation of the remote key, and the normal operation of the engine by the specific operation of the remote key. It is characterized in that it is configured to enable starting.

In this case, the control means may be arranged to stop the engine after a predetermined time or a predetermined distance when the remote key is operated, when the engine is started (claim 2). .

Further, the control means may set the fuel pump in an operable state so that the engine can be started normally (claim 3). Further, the control means may stop the engine by turning off the operating circuit of the fuel pump (claim 4).

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment in which the present invention is applied to an automobile as a vehicle will be described below with reference to FIG. In FIG. 1 showing an electrical configuration, a remote key 1 has a lock switch 1a and an unlock switch 1b in a main body, and these switches 1a or 1
When b is operated, a lock signal or an unlock signal of an automobile door (not shown) is transmitted via the transmission antenna 1c by modulating microwaves, for example. A receiving circuit 3 that receives and outputs these lock signal or unlock signal via the receiving antenna 2 is provided on the automobile side.

The lock signal output terminal 3a of the receiving circuit 3 is
Input terminal 5a of AND gate 5 via NOT gate 4
Is connected to one of the input terminals of the OR gate 6, and is further connected to the input terminal 7a of the operation determination circuit 7. The unlock signal output terminal 3b of the receiving circuit 3 is connected to the input terminal 9a of the AND gate 9 through the NOT gate 8 and the other input terminal of the OR gate 6, and further, It is connected to the input terminal 7b of the operation determination circuit 7.

When receiving the lock or unlock signal, the receiving circuit 3 outputs a low level pulse to the lock or unlock signal output terminal 3a or 3b in one shot.

The key reminder switch 10 is a switch that is turned on when the ignition key is inserted into the key cylinder, one terminal of which is connected to the ground and the other terminal of which is connected to the input terminal of the NOT gate 11. At the same time, it is connected to the positive terminal + B of the battery via the pull-up resistor 12.

The output terminal of the NOT gate 11 is the enable input terminal 7c of the operation determination circuit 7 and the AND gate 13.
Input terminal 13b and one-shot multivibrator
Connected to the input terminal of the computer 14 and further includes a NOT gate 15
Is connected to the input terminal 5b of the AND gate 5 and the input terminal 9b of the AND gate 9. The output terminal of the operation determination circuit 7 is the input terminal 1 of the AND gate 13.
3a. The AND gates 5 and 9 are
It constitutes a door control prohibiting circuit 28.

The operation determination circuit 7 has an enable input terminal 7
When a high-level signal is given to c, it is determined whether or not the signal given from the receiving circuit 3 by a specific operation of the remote key 1 described later matches a preset signal pattern. It outputs a high level normal signal in one shot.

The input terminal of the door lock control circuit 16 is A
Connected to the output terminals of ND gates 5 and 9, respectively,
The output terminals are respectively connected to the input terminals of the door lock device 17 including a lock actuator. The door lock control circuit 16 then operates the AND gates 5 and 9
A drive signal is given to the door lock device 17 in response to a lock signal and an unlock signal output from the door lock device 17. The door lock device 17 locks and unlocks the door in response to these drive signals. (Unlock).

In the "ON" switch 18 and the "ACC" switch 19 of the key cylinder, one terminal is connected to the input terminal of the OR gate 20 and is also connected to the ground via pull-down resistors 21 and 22. And the other terminal is connected to the battery. And
The output terminal of the OR gate 20 is connected to the input terminal 23b of the AND gate 23, and the NOT gate 24
Is connected to the input terminal 13c of the AND gate 13. Further, the input terminal 23a of the AND gate 23 is
It is connected to the output terminal of the OR gate 6.

The output terminal of the AND gate 13 is connected to the ground via the exciting coil 25a of the latching relay 25. The output terminal of the AND gate 23 is O
It is connected to one input terminal of the R gate 26, and OR
The other input terminal of the gate 26 is connected to the output terminal of the one-shot multivibrator 14. The one-shot multivibrator 14 outputs a high-level pulse signal having a predetermined pulse width in one shot, triggered by the falling edge of the input signal.

The output terminal of the OR gate 26 is connected to the ground via another exciting coil 25b of the latching relay 25. In the relay switch 25c of the latching relay 25, the movable contact 25d is connected to the ground, and the fixed contact 25e is the exciting coil 27a of the relay 27.
Are connected to one terminal. In addition, fixed contact 25f
Is a rest contact that is not connected to either. The normally open contact 27b of the relay 27 constitutes a part of an operation circuit that controls energization of a fuel pump (not shown).

Moving contact 25d of relay switch 25c
Is switched to the fixed contact 25e side when the exciting coil 25a is energized, and is switched to the fixed contact 25f side when energizing the exciting coil 25b. Also, relay 2
The voltage of the battery is supplied to the other terminal of the excitation coil 27a of No. 7. And exciting coil 2
When 7a is energized, the normally open contact 27b of the relay 27 is closed.

In the above, the operation determination circuit 7, the one-shot multivibrator 14, the NOT gate 11,
15 and 24, OR gates 6, 20 and 26, AND gates 13 and 23, and latching relay 25 constitute a theft prevention control circuit 29, and the control means 30 is constituted by removing the door lock device 17 from the overall configuration. doing.

Next, the operation of the present embodiment will be described. (1) When starting the engine normally First, in the initial state, the movable contact 2 of the relay switch 25c
It is assumed that 5d is switched to the fixed contact 25f side. In this case, the driver (owner) tries to unlock the door of the vehicle by turning on the unlock switch 1b of the remote key 1 from outside the vehicle. Receiver circuit 3
When the unlock signal is received, the low-level pulse signal is output to the unlock signal output terminal 3b.
The high-level pulse signal inverted by the NOT gate 8 is applied to the input terminal 9a of the D gate 9.

At this time, since the ignition key is not inserted in the key cylinder, the key reminder switch 1
0 is off, and the input terminal of the NOT gate 11 is at high level. Therefore, since the input terminal 9b of the AND gate 9 is at the high level, the pulse signal given to the input terminal 9a is directly output to the output terminal of the AND gate 9. Then, an unlock drive signal is given to the door lock device 17, and the door is unlocked.

When the driver gets on the vehicle, first, the ignition key is inserted into the key cylinder. Then, the key reminder switch 10 is turned on, the input terminal of the NOT gate 11 becomes low level, and at this time, the output of the lock or unlock signal from the door control prohibiting circuit 28 is prohibited. Further, a high level signal is also applied to the enable input terminal 7c of the operation determination circuit 7 and the input terminal 13b of the AND gate 13.

Next, the driver performs a predetermined specific operation on the remote key 1. For example, the specific operation is
It is assumed that the lock switch 1a is turned on three times. The operation determination circuit 7 compares the signal pattern with a preset pattern, and if they match, outputs a high-level normal signal in one shot. Then, the input terminal 13b of the AND gate 13 is at the high level as described above, the key rotor is not rotated, the output signal of the OR gate 20 is at the low level, and the input terminal 13c is also at the high level. Gate 1
The output terminal of 3 becomes high level and the latching relay 2
The excitation coil 25a of No. 5 is energized, and the relay switch 2
The movable contact 25d of 5c is switched to the fixed contact 25e side.

Since the exciting coil 27a of the relay 27 is energized, the normally open contact 27b is closed and the fuel pump is in an operable state, and fuel is supplied to the engine as usual and normal operation is performed. Starting is possible, and the engine is started by the driver turning the key rotor to the "START" position (not shown).

When the driver stops the engine and removes the ignition key from the key cylinder after getting off the vehicle, the key reminder switch 10 is turned off and the input terminal of the NOT gate 11 is turned off. From low level to high level. Then, the input terminal of the one-shot multi-vibrator 14 changes from the high level to the low level and is triggered, and the one-shot multi-vibrator 14 outputs a high-level pulse signal. This pulse signal is output from the OR gate 26 and energizes the exciting coil 25b of the latching relay 25, so that the movable contact 25d is switched to the fixed contact 25f side.

(2) When there is an intruder in the automobile while the engine is being started: Here, when the intruder dismounts the driver from the automobile whose engine is being started and tries to escape by driving the automobile himself. Assume When the engine is starting, the key rotor is rotated to the "ON" position, the "ON" switch 18 is turned on, and the output terminal of the OR gate 20 is at the high level.

At this time, the driver (owner) operates the lock or unlock switch 1a or 1b of the remote key 1 held by the driver only once before the vehicle runs away. At this time, as described in (1), since the signal output from the door control prohibiting circuit 28 is prohibited, the operating sound of the lock actuator or the like is not generated and is not noticed by the intruder.

At the input terminal 23b of the AND gate 23,
Since a high level signal is given from the output terminal of the OR gate 20, the lock or unlock signal received by the receiving circuit 3 is passed through the OR gate 6 and the AND gate 2
3 is applied to the input terminal 23a of the AND gate 23
Outputs the signal as it is. Then, OR gate 2
Since 6 outputs a high level signal, the exciting coil 25b of the latching relay 25 is energized and the movable contact 25d of the relay switch 25c is switched to the fixed contact 25f side.

Then, the exciting coil 27a of the relay 27 is cut off, the normally open contact 27b is opened, the energization of the fuel pump is stopped, and the fuel supply to the engine is also stopped. Therefore, the engine continues to run until the fuel remaining in the pipes and filters in the fuel supply system from the fuel pump to the engine is consumed, and when the remaining fuel is exhausted, the engine stops and the car Stop running.

(3) When a person other than the owner obtains the ignition key and starts the engine of a stopped automobile When the person who obtains the ignition key gets in the automobile and inserts the ignition key into the key cylinder, The engine is started by rotating the key rotor without performing a specific operation of the remote key 1. Therefore, the latching relay 25
The movable contact 25d remains switched to the fixed contact 25f side. However, although the engine can be started and the vehicle can be driven to some extent afterwards with the residual fuel as described above, the engine stops and the vehicle stops when the residual fuel is exhausted, as in the case of (2). Stops running.

Further, in this case, the person who has acquired the ignition key knows that the specific operation of the remote key 1 is necessary, and when the driver (owner) tries to hear it, the driver makes a random Even if you tell me, it is possible to start the engine and the result is similar to the above, and it is possible to stop the running of the car, that is, the escape, without making the person who acquired the ignition key doubt. is there.

As described above, according to this embodiment, when the key reminder switch 10 detects that the ignition key is inserted in the key cylinder, the control means 30 operates the door lock control device based on the operation of the remote key 1. The door control prohibiting circuit 28 prohibits the door lock or unlock signal output to be given to the door 17 and the operation judging circuit 7 enables the engine to be started normally by the specific operation of the remote key 1. Alternatively, the specific operation of the remote key 1 can be performed without performing the unlocking operation, and the engine cannot be normally started without knowing the specific operation, so that the vehicle can be prevented from being stolen. it can.

Further, even if the intruder tries to escape by driving the automobile while the engine is starting, the driver (owner) does not operate the door lock device 17 and the remote key is not noticed by the intruder. 1 can be operated to stop the engine of the automobile after a predetermined time or after traveling for a predetermined distance to disable traveling, so that even in this case, the remote key 1 can be easily operated to prevent the automobile from being stolen. .

Further, even if a person other than the owner obtains the ignition key and tries to start the engine of the stopped automobile, the engine should be started unless the specific operation of the remote key 1 is correctly performed. Even if the vehicle is started, it is possible to stop the engine by stopping the engine after a predetermined time or a predetermined distance, as described above.

In addition, according to this embodiment, the control means 30
Enables the engine to start normally with the fuel pump in an operable state, and when the engine is started, when the remote key 1 is operated, the anti-theft control circuit 29 causes the normally open contact 27b of the relay 27 to open. Since the engine is stopped after a predetermined time or a predetermined distance by disconnecting the operating circuit of the fuel pump in the open state, the fuel remaining in the fuel supply system from the fuel pump to the engine is used. The anti-theft function can be easily realized.

FIG. 2 shows a second embodiment of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Only different parts will be described below. In FIG. 2 showing the electrical configuration, the fixed contact 25 of the latching relay 25 is shown.
In the case of e, the relay 27 has been removed to serve as a rest contact,
One terminal of the exciting coil 31a of the relay 31 is connected to the fixed contact 25f. Further, the normally closed contact 31b of the relay 31 is incorporated in the ignition power supply system of the engine.

The other terminal of the exciting coil 31a of the relay 31 is adapted to be supplied with the voltage of the battery through the delay energizing circuit 32 and the "ON" switch (similar to the switch 18) (not shown) of the key rotor. When the exciting coil 31a is energized, the normally-closed contact 31b of the relay 31 is opened. Further, the delay energizing circuit 32 is adapted to energize by applying the voltage of the battery to the exciting coil 31a after a lapse of a predetermined time when the fixed contact 25f is connected to the ground.

According to the second embodiment constructed as described above, assuming a case similar to (2) of the first embodiment, the driver operates the remote key 1 to operate the relay switch 25c.
When the movable contact 25d of the above is switched to the fixed contact 25f side, the delay energizing circuit 32 causes the exciting coil 3
Power is supplied to 1a. Then, the normally closed contact 31b of the relay 31 is opened, the power supply system for the ignition of the engine is cut off, the engine is stopped at that point, and the traveling of the automobile is also stopped.

In the case of (3) of the first embodiment, the same operation is performed by turning on the "ON" switch, and (1)
In the case, the movable contact 25d of the relay switch 25c is switched to the fixed contact 25e side and the relay 31 is invalidated.
Therefore, according to the second embodiment, the same effect as that of the first embodiment can be obtained.

The present invention is not limited to the embodiments described above and shown in the drawings, but the following modifications or expansions are possible. The specific operation of the remote key 1 is not limited to one in which the lock switch 1a is turned on three times, and the number of times of the on operation is appropriately changed.
b may be operated a plurality of times, the switch 1a or 1b may be operated in an appropriate order, or either one of the switches 1a and 1b may be turned on for a certain period of time. The remote key 1 is not limited to one having the lock switch 1a and the unlock switch 1b separately, but one switch may be used for both.

The normally closed contact 31b of the relay 31 in the second embodiment is provided, for example, in an operation circuit of an intake throttle valve for limiting the intake amount of air to the fuel injection part of the engine, and the normally closed contact 31b of the normally closed contact 31b is provided. A configuration may be adopted in which the operating circuit is cut off to close the intake throttle valve in the open state. The signal transmission by the remote key 1 is not limited to using microwaves, and electromagnetic induction signals, electrostatic induction signals, or light may be used. Not limited to automobiles, it can be applied to vehicles in general.

[0041]

As described above, the present invention has the following effects. According to the vehicle antitheft device of claim 1, the control means prohibits the locking or unlocking operation of the door based on the operation of the remote key when the ignition key is inserted into the key cylinder, and the remote key. Since the normal operation of the engine is enabled by the specific operation of the remote key, the specific operation of the remote key can be performed without locking or unlocking the door. Theft can be prevented.

According to the vehicle anti-theft device of the second aspect, the control means controls the engine when the engine is started.
Since the engine is stopped after a predetermined time or after traveling a predetermined distance on condition that the remote key is operated, even if there is an intruder in the vehicle, the owner can easily operate the remote key to operate the vehicle. Theft can be prevented.

According to the vehicle anti-theft device of the third or fourth aspect, the control means sets the fuel pump in an operable state as a normal startable state of the engine and disconnects the operating circuit of the fuel pump to turn on the engine. Since it is stopped, the antitheft function can be easily realized.

[Brief description of the drawings]

FIG. 1 is an electrical configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

[Explanation of symbols]

1 is a remote key, 7 is an operation determination circuit, 16 is a door lock control circuit, 27 is an operation circuit, 28 is a door control prohibition circuit, 29 is an antitheft control circuit, and 30 is a control means.

Claims (4)

[Claims] 1. A vehicle having a control means for locking or unlocking a door based on an operation of a remote key, wherein the control means is configured to: when an ignition key is inserted into a key cylinder, Prohibits door lock or unlock operation based on remote key operation, and
An antitheft device for a vehicle, which is configured to enable a normal start of an engine by a specific operation of the remote key. 2. The control means is configured to, when the engine is started, stop the engine after a predetermined time or a predetermined distance when the remote key is operated. The antitheft device for a vehicle according to claim 1. 3. The antitheft device for a vehicle according to claim 1, wherein the control means sets the fuel pump in an operable state as a normal startable state of the engine. 4. The anti-theft device for a vehicle according to claim 2, wherein the control means stops the engine by disconnecting an operation circuit of the fuel pump.