JP2003072518A - Vehicle anti-theft device - Google Patents

Abstract

(57) [Summary] In a device for preventing a vehicle from being stolen, not only an alarm is issued but also the operation of an engine 17 can be prevented, and a specific operation is not required and the driver can drive the vehicle. Make sure you don't feel troubled. A remote controller key signal for opening and closing a door of a vehicle is received by a remote control key receiver, and an unlock signal or a lock signal from the remote controller key receiver is received to open and close the door. Controls. An ignition signal is transmitted from the ignition switch 11 by the engine start key 1, and the engine control computer 13 starts the engine 17 in response to the signal. Then, the ON / OFF unit 15 that has received the unlock signal or the lock signal from the remote control key receiving unit 7 turns the ignition signal circuit 13 sent from the ignition switch on or off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle theft for invalidating or validating a signal from an ignition switch by determining whether a remote control key signal for opening and closing a vehicle door is an unlock signal or a lock signal. Regarding prevention device.

[0002]

2. Description of the Related Art There have been proposed many devices for preventing vehicle theft.

For example, there is a technique for issuing an alarm when the door of a vehicle is forcibly opened (Japanese Patent Laid-Open No. 2000-0.
85535).

Further, the detection of the operation of the remote key for opening and closing the door and the detection of the insertion of the ignition key for starting the engine are interlocked, and if the specific operation of the remote key is not performed correctly, the opening and closing of the door will occur. There is a technique of prohibiting or stopping the fuel pump of the engine (Japanese Patent Laid-Open No. 09-132116).

[0005]

However, the former of the above prior arts merely issues an alarm,
The operation of the engine cannot be stopped, and the vehicle can be started.

In the latter case, although opening and closing of the door is prohibited and the fuel pump of the engine is stopped, it is difficult to actually start the vehicle and the operation of the engine can be prevented, but the driver can operate the remote key. It is necessary to carry out a specific operation by, which makes driving a car troublesome.

The present invention has been made in order to solve the above problems, and the vehicle is stolen so that the operation of the engine can be prevented, a specific operation is not necessary, and the driver does not feel troubled driving the vehicle. The purpose is to provide a protection device.

[0008]

In order to solve the above problems, the first invention determines whether a remote control key signal for opening and closing a vehicle door is an unlock signal for opening a door or a lock signal for closing a door. When the determination means and the unlock signal are determined, the ignition signal sent from the ignition switch to the engine control computer is activated by the engine start key, and the ignition signal is determined when the lock signal is determined. A vehicle theft prevention device, comprising: a valid / invalid means for invalidating the.

In a second aspect of the invention, the determining means further comprises:
A remote control key receiving unit that receives a remote control key signal for opening and closing a vehicle door; and a door opening and closing control unit that receives the unlock signal or the lock signal from the remote control key receiving unit and controls the opening and closing of the door. In the vehicle having the remote control key receiving unit, the valid / invalid means includes an ignition switch for transmitting an ignition signal by an engine start key, and an engine control computer for starting the engine in response to the ignition signal from the ignition switch. Upon receiving an unlock signal or a lock signal from the remote control key receiving unit in a vehicle having the vehicle, an ignition signal circuit sent from the ignition switch is turned on.
The vehicle antitheft device is an ON / OFF unit that is turned on or off.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS.
As shown in FIG.

First, as shown in FIG. 1, a remote control key 3 integrated with an engine start key 1 is used to open and close a vehicle door. A remote control key receiving section 7 for receiving the remote control key signal 5 from the remote control key 3 is provided, for example, at a position where the signal 5 reaches through the door glass in the vehicle compartment.

At this time, the signal 5 itself from the remote control key 3 may be of two types, that is, a lock signal for closing the door and an unlock signal for opening the door, or there is one type of signal and the remote control key receiving section 7 is provided. In the above, if the previous state is the locked state, the unlock signal may be determined next, and if the previous state is the unlocked state, the lock signal may be determined.

A door opening / closing control unit 9 is provided which is connected to the remote control key receiving unit 7 and receives an unlock signal or a lock signal from the remote control key receiving unit 7 to control opening / closing of the door.

Further, an ignition switch 11 for transmitting an ignition signal by inserting the engine start key 1 into a key cylinder and rotating the key is provided.

An ON / OFF unit 15 is provided which is connected to the ignition switch 11 and turns the circuit 13 for the ignition signal sent from the ignition switch 11 into an ON state or an OFF state. This ON
The OFF unit 15 receives the unlock signal from the remote control key receiver 7 and turns the circuit 13 on.
Alternatively, it receives a lock signal and turns off.

ON for ignition switch 11
Is connected by the circuit 13 via the OFF unit 15,
An engine control computer 19 is provided for starting the engine 17 in response to an ignition signal.

The operation of FIG. 1 will be described with reference to the flow chart of FIG.

The normal operation of the driver when he / she gets on is to operate the remote control key 3 from the outside of the vehicle through the door glass,
Emits signal 5. Depending on the remote control key 3, this signal itself is an unlock signal for opening the door. Alternatively, it is a signal that does not distinguish between an unlock signal and a lock signal. The remote control key receiving unit 7 immediately determines that the unlock signal is an unlock signal when the unlock signals are distinctive. Alternatively, in the case of a signal having no distinction, if the previous state is the lock state, this time, it is determined to be the unlock signal (FIG. 2 (S1)).

Next, the driver opens the unlocked door, sits in the driver's seat, and inserts the engine start key 1 into, for example, a key cylinder to rotate the engine, so that the ignition switch 11 outputs an ignition signal. At this time, the ON / OFF unit 15 receives the unlock signal from the remote control key receiving unit 7 and turns the circuit 13 on, so that the ignition signal becomes valid (( S2)), the engine control computer 19 receiving this valid signal
Start 7.

The normal operation when the driver gets off the vehicle is to stop the engine, open the door, go outside, operate the remote control key 3 through the door glass, and emit a signal 5. The remote control key receiving unit 7 immediately determines that the unlock signal is a lock signal when the unlock signal is distinctive. Alternatively, in the case of a signal having no distinction, since the previous state is the unlocked state, it is determined to be the lock signal this time ((S1) (S3) in the same figure).

Next, when a person who intends to steal the vehicle gets into the vehicle, generally, the remote control key 3 is not provided and the door is forcibly opened from the outside of the vehicle.

At this time, when the signal from the remote control key 3 is a signal having a distinction between the unlock signal and the lock signal, the determination by the remote control key receiving section 7 is that the previous lock signal is received. It is still done. When the signals are indistinguishable, the remote controller key receiving unit 7 determines that the previous state is the lock state, and the signal itself has not been received this time. Therefore, it is determined that the lock signal is received. ((S3) in the figure).

Next, the person who intends to steal the vehicle sits in the driver's seat with the door opened forcibly, without using the engine start key 1.
For example, by inserting a metal piece into the key cylinder and rotating it, the ignition switch 11 is turned on and an ignition signal is sent out. At this time, the ON / OFF unit 15 receives the lock signal from the remote control key receiver 7. The ignition signal is invalid because the circuit remains off and the circuit is in the OFF state ((S4) in the figure).
Never start 7.

Next, FIG. 3 shows an example of a concrete circuit diagram of the ON / OFF unit (valid / invalid means) 15. The ON / OFF unit 15 receives the unlock signal from the remote control key receiving section 7, turns on the circuit 13 that sends the ignition signal from the ignition switch 11 to the engine control computer 19, and turns it off upon receiving the lock signal. It fulfills the function of making a state.

That is, the lock signal from the remote control key receiving section 7 is received by the (+) side of the operational amplifier 21 with high impedance, and VCC is applied to the (-) side of the operational amplifier 21 in order to detect the rising edge of this signal from L to H. Apply the divided voltage of and compare. When the output of the operational amplifier 21 changes from L to H, the flip-flop of the NOR circuit 23 is hit and the NPN
Set the base voltage of the transistor 24 to "L"
The NP transistor 25 is turned off, the signal from the ignition section 11 to the engine computer section 19 is cut off, and the circuit 13 is turned off.

Similarly to the above description, the unlock signal from the remote control key receiving section 7 is also such that the output of the other operational amplifier 27 hits the flip-flop of the other NOR circuit 29 to set the base voltage of the NPN transistor 24 to "H", Last stage PNP
The transistor 25 is turned on, the signal from the ignition section 11 to the engine computer section 19 is conducted, and the circuit 13 is turned on.

(Effects of Embodiment) According to the above embodiments, even if the remote control key signal 5 remains the unlock signal for opening the door, the door is forcibly opened and the door is forcibly closed. Even if the ignition signal is sent from the ignition switch 11 that is turned on,
This ignition signal is invalidated by the ON / OFF unit 15 and the operation of the engine 17 can be blocked.
Further, a specific operation unlike the conventional example is completely unnecessary, and the driver does not feel troubled driving the vehicle.

Further, as the determination means for determining the unlock signal or the lock signal, the remote control key receiving section 7 which is conventionally provided and receives the remote control key signal 5 for opening and closing the door of the vehicle can be used as it is. Further, the valid / invalid means for validating or invalidating the ignition signal can be mounted on a conventional vehicle as an ON / OFF unit 15 for turning on / off the circuit 13 of the ignition signal sent from the ignition switch 11. . As a result, not only the cost of the entire device can be increased, but also the replacement of the vehicle without the anti-theft device with the vehicle with the anti-theft device can be made unnecessary.

(Other Embodiments) In the above embodiments, O
In the configuration of the N-OFF unit 15, the operational amplifiers 21 and 27 are used to receive the lock signal and the unlock signal.
However, in other embodiments, other electronic devices such as transistors and comparators can be used instead of the operational amplifier.

Further, in the above embodiments, the flip-flop (23,
29) was used, but in other embodiments, other electronic devices such as SCRs and CPUs can be used instead of flip-flops.

Further, although the transistors 24 and 25 are used for the output section in the above embodiments, other electronic elements such as FETs and relays can be used in other embodiments.

[0032]

As described above, claim 1 or 2
According to the invention, even if the remote control key signal remains the unlock signal for opening the door, the door is forcibly opened and the ignition signal is forcibly sent from the ignition switch. Even so, this ignition signal is disabled and the engine can be stopped. Also, no specific operation is required,
The driver does not have to worry about driving the car.

According to the second aspect of the present invention, the determination means for determining whether the signal is an unlock signal or a lock signal is a conventional remote control key receiving section that receives a remote control key signal for opening and closing a vehicle door. Is used as it is, and the valid / invalid means for validating or invalidating the ignition signal sets the circuit of the ignition signal sent from the ignition switch to the ON state or the OFF state.
The N / OFF unit can be retrofitted on a conventional vehicle, which not only reduces the cost of the entire apparatus but also makes it unnecessary to replace the vehicle with a theft prevention device.

[Brief description of drawings]

FIG. 1 is a schematic block diagram according to an embodiment of the present invention.

FIG. 2 is a schematic flowchart illustrating the operation of FIG.

FIG. 3 is a circuit diagram showing a specific configuration of the ON / OFF unit shown in FIG.

[Explanation of symbols]

1 Engine start key 3 Remote control key 5 Remote control key signal 7 Remote control key receiver (determination means) 9 Door opening / closing control section 11 Ignition switch 13 circuits 15 ON / OFF unit (effective / ineffective means) 17 engine 19 Engine control computer 21 operational amplifier 23 NOR circuit 24 NPN transistor 25 PNP transistor 27 operational amplifier 29 NOR circuit

Claims (2)

[Claims] 1. A determination means for determining whether a remote control key signal for opening and closing a vehicle door is an unlock signal for opening a door or a lock signal for closing a door, and an engine start key when it is determined to be an unlock signal. Vehicle theft, characterized by comprising: an enabling / disabling means for enabling the ignition signal sent from the ignition switch to the engine control computer by the ignition switch, and disabling the ignition signal when it is determined to be a lock signal. Prevention device. 2. The determination means receives a remote control key signal for opening and closing a door of a vehicle, and a remote control key receiving section that receives an unlock signal or a lock signal from the remote control key receiving section to open or close the door. A door opening / closing control unit for controlling the remote control key receiving unit in a vehicle having, wherein the effective / ineffective means is an ignition switch for transmitting an ignition signal by an engine start key, and an ignition signal received from the ignition switch. An engine control computer for starting an engine, which receives an unlock signal or a lock signal from the remote control key receiving unit in a vehicle, and turns on or off an ignition signal circuit sent from the ignition switch.・ O
The vehicle antitheft device according to claim 1, which is an FF unit.