JPH09109838A - Vehicular theft prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out an alarm system release even the battery capacity of a transmitter for a keyless remote control entry is dropped. SOLUTION: A battery monitor circuit 91 for detecting the capacity of a battery 51 is installed in a transmitter 39. A battery capacity information is written in the memory of a transponder chip and this battery capacity information is sent to an imobilizer control unit as well as the key discrimination information of the transponder chip. A theft prevention control unit releases the output of a theft warning order by the comparison of a keyless discrimination number from the transmitter 39 except at the lack time of the battery capacity and releases the output of a theft warning order by the comparison of a key discrimination information instead of the comparison of the keyless discrimination number on only the lack time of the battery capacity and that the unlock switch of a door key cylinder is turned on.

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 in an automobile or the like, and more particularly to a vehicle antitheft device that outputs an on-board theft alarm and prevents vehicle self-propelled theft.

[0002]

2. Description of the Related Art As an anti-theft device for a vehicle, when a vehicle opening / closing door such as a door, a trunk lid or a hood is opened by an unjustified means other than a legitimate means, a horn mounted on the vehicle, a head lamp, etc. are operated. If the on-vehicle theft alarm device is checked and the key identification number (key ID number) is checked and the check result is not correct, the vehicle self-propelled theft that prohibits starting of the engine such as the engine and stops the engine Preventing devices are known.

FIG. 4 shows an example of a conventional vehicle theft alarm device. This on-board theft alarm device has an anti-theft control unit (anti-theft control unit) 1. The anti-safety control unit 1 inputs a signal from the door key lock switch 3 and the door lock state switch 5 as a set input and a reset input, and outputs an alarm. A set / reset signal is input from a receiver (wireless receiver) 7 with an antenna for keyless remote control entry, and a door switch 9, a hood switch 11, a trunk lid switch 13, and a tamper are used as door opening sensors for vehicle opening / closing doors. A signal is input from each of the switches 15, and at the time of alarm activation, a theft warning command is output to the relay circuits 23, 25, 27 of the theft warning horn 17, horn 19, and headlamp 21, and an operation command is issued to the anti-theft relay circuit 29. Is output. The inhibit relay circuit 33 of the starter motor 31 is connected to the anti-theft relay circuit 29. A security lamp 35 is connected to the anti-safety control unit 1.

In this on-board theft alarm system, a vehicle key plate for keyless remote control entry having a transmitter 39 embedded in a key head is used as the vehicle key plate 37. The transmitter 39 has a microprocessor 41 in which a keyless identification number (ID number) unique to the vehicle is written, a modulation circuit 43 and a transmission circuit 45 for wireless communication, an RF amplification circuit 47, and an antenna 49. It operates as a power source using a battery 51, which constitutes a wireless transmitter and is replaceably provided on the head portion of the vehicle key plate 37.

In the anti-safety control unit 1, in the set state, the receiver 7 monitors the reception of the keyless identification number transmitted by the transmitter 39 of the vehicle key plate 37, and the receiver 7 receives the keyless identification number. When it is detected that the vehicle opening / closing doors are opened by the signal input from the door switch 9, the hood switch 11, the trunk lid switch 13, and the tamper switch 15 in a state where the collation result is not appropriate, the relay is activated. Circuits 23, 25, 2
7. The theft alarm command and operation are output to the anti-theft relay circuit 29, and the security lamp 35 is turned on.

As a result, when the vehicle opening / closing doors are opened by improper means, the theft warning horn 17 and the horn 19 output a horn sound, the headlamp 21 flashes, and the security lamp 35 lights up. Sounds and lights warn you of being stolen. Further, at this time, the operation of the starter motor 31 is prohibited, the engine start is blocked, and the vehicle is prevented from stealing.

FIG. 5 and FIG. 6 show an example of a conventional vehicle self-propelling prevention theft prevention device. In the vehicle self-propelled antitheft device, a vehicle key plate 6 incorporating a transponder chip 61 having a key identification number unique to the vehicle.
3, the reader 65 for reading the key identification number from the transponder chip 61 while supplying electric power to the transponder chip 61 in a contactless manner by electromagnetic induction, and the key identification number is input from the reader 65, the key identification information is collated, and the collation result is obtained. Engine control unit 6 if
7, an immobilization control unit 69 that outputs a start permission signal to the engine control unit 67 and outputs a start prohibition signal to the engine control unit 67 when the comparison result is not appropriate.

FIG. 7 shows the detailed structure of the transponder chip 61 and the reader 65. The transponder chip 61 is an EEPROM that stores a key identification number unique to the vehicle.
M90, access controller 71, contactless interface section 73, electromagnetic induction coupling coil 75
And the immobilizer control unit 69 includes a transmission controller 77 to which control data is given from the immobilizer control unit 69, and an immobilizer control unit 69.
(F) A reception recorder 79 for outputting data and an electromagnetic induction coupling coil 81, and a transmission controller 77.
Under the control of the transmission electromagnetic induction coupling coils 75, 8
Power is supplied from the reader 65 to the transponder chip 61 by electromagnetic induction by 1, the reader 65 reads the key identification number from the transponder chip 61, and this data is input to the reception recorder 79.

In a vehicle equipped with this vehicle self-propelled antitheft device, if the ignition key position is set to the ignition starter position, the engine is unconditionally started and the engine control unit 6
When 7 inputs the start permission signal, the engine on state is continued, and when the engine control unit 67 inputs the start prohibition signal, the engine is forcibly stopped.

[0010]

In the conventional on-board theft alarm device as described above, the theft alarm is released (alarm system release) using the keyless identification number held by the vehicle key plate 37 for keyless remote control entry. ) Is performed, higher anti-theft property is obtained compared with the case where the alarm system is released by mechanically unlocking the door key cylinder with the key plate, but on the other hand, the keyless that outputs the keyless identification number Battery 51 of transmitter 39 for remote control entry
If the transmitter 39 does not operate normally due to a decrease in the capacity of the power supply and the power is insufficient, the alarm system cannot be released even if the regular vehicle key plate 37 is used.

In the self-propelled vehicle antitheft device, the transponder chip 6 is supplied with power from the reader 65 by electromagnetic induction.
1 does not require a power supply battery, always operates normally, and accurately prevents theft by preventing the vehicle from running. However, the vehicle self-propelled prevention anti-theft device does not have a function of outputting an on-board theft alarm, and this vehicle self-propelled anti-theft device does not issue an on-board theft alarm.

The present invention has been made by paying attention to the above-mentioned problems, and performs the theft prevention by the self-propelled prevention of the vehicle and the theft alarm output on the vehicle, and does not require a power battery or is keyless. It is an object of the present invention to provide a vehicle antitheft device improved so that the alarm system can be released even if the battery capacity of the transmitter for remote control entry is lowered.

[0013]

In order to achieve the above object, a vehicle antitheft device according to claim 1 of the present invention includes a vehicle key plate incorporating a transponder chip having vehicle-specific key identification information. , The key identification information of the transponder chip is compared, and the verification result of the immobilizer control unit for vehicle self-propelled antitheft that allows the start of the vehicle prime mover only when the verification result is appropriate, and the key identification information of the transponder chip are If it is proper, the output of the theft alarm command is canceled, and if the vehicle opening / closing doors are opened under the condition that the verification result of the key identification information of the transponder chip is not correct, the theft alarm control unit outputs the theft alarm command. And have.

In the vehicle antitheft device according to the present invention, the immobilizer control unit prevents theft by preventing the vehicle from running, and the antitheft control unit outputs an on-board theft alarm and releases the theft alarm command. ,
That is, the alarm system is released by collating the key identification information of the transponder chip. Since the transponder chip is externally supplied with electric power by electromagnetic induction coupling, the transponder chip does not fall into a malfunction state due to lack of electric power, so that the alarm system is released at any time when a regular vehicle key plate is used.

In order to achieve the above object, a vehicle antitheft device according to claim 2 of the present invention is for a transponder chip having vehicle-specific key identification information and a keyless remote control entry having vehicle-specific keyless identification information. Immobilizer control unit for vehicle self-propelled anti-theft protection that collates the vehicle key plate incorporating the transmitter with the key identification information of the transponder chip and permits the start of the vehicle prime mover only when the collation result is appropriate. And a receiver for keyless remote control entry for receiving keyless identification information transmitted by the transmitter,
And a theft control unit that outputs a theft alarm command when the vehicle opening and closing doors are opened under a state in which the verification result is not appropriate and the keyless identification information received by the receiver is verified,
The transmitter is provided with a battery capacity detection unit that detects the capacity of the self-power source battery, the transponder chip has a storage unit that stores the battery capacity detected by the battery capacity detection unit, and the immobilizer control unit Receives battery capacity information from the transponder chip, outputs a battery capacity shortage signal based on the battery capacity information to the anti-theft control unit when the key identification information is properly collated, and the anti-theft control unit only inputs the battery capacity shortage signal. Instead of collating the keyless identification information, the output of the theft alarm command is canceled by turning on the unlock switch of the door key cylinder.

In the vehicle antitheft device according to the present invention, the immobilizer control unit prevents theft by preventing the vehicle from running, and the antitheft control unit outputs an on-board theft alarm and releases the theft alarm command. ,
In other words, the alarm system is released by checking the keyless identification information transmitted by this transmitter if the battery capacity of the transmitter for keyless remote control entry is greater than or equal to a predetermined value, and if the battery capacity is less than or equal to the predetermined value. Instead of the verification of the identification information, the verification of the key identification information of the transponder chip and the AND condition that the door key cylinder is unlocked are performed. As a result, even if the battery capacity becomes equal to or less than the predetermined value, the alarm system is released by using the regular vehicle key plate.

[0017]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the embodiments of the present invention described below, the same components as those of the above-described conventional example are denoted by the same reference numerals as those of the above-described conventional example, and description thereof will be omitted.

The vehicle key plate 63 used in the vehicle anti-theft device according to the present invention has a transmitter 39 for keyless remote control entry having a keyless identification number peculiar to the vehicle and a key identification peculiar to the vehicle in the bed. A transponder chip 61 having information is embedded.

The transmitter 39 is a battery for self-power supply, that is, the battery 5
It has a battery monitor circuit 91 for detecting the capacity of 1. The capacity of the battery 51 detected by the battery monitor circuit 91 is input to the microprocessor 41. The microprocessor 41 compares the battery capacity detected by the battery monitor circuit 91 with a preset comparison reference value,
If the battery capacity detection value is less than or equal to the comparison reference value, a battery capacity shortage signal indicating that is output to the E of the transponder chip 61.
Writing to a predetermined address of the EPROM 90 is performed.

The battery capacity shortage signal written in the EEPROM 90 is read by the reader 65 by the electromagnetic induction by the electromagnetic induction coupling antennas 75 and 81 together with the key identification number written in the EEPROM 90, and the reader 65.
It is transferred to the immobilizer control unit 69.

The immobilizer control unit 69, like the conventional one, collates the key identification information from the reader 65 and, if the collation result is proper, the engine control unit 6
A start permission signal is output to No. 7, and a start prohibition signal is output to the engine control unit 67 if the comparison result is not appropriate.

The anti-theft control unit 1 is newly connected to the immobilizer control unit 69, and the immobilizer control unit 69 outputs the battery capacity shortage signal to the anti-theft control unit 1 only when the collation result of the key identification information is proper. .

When the anti-theft control unit 1 does not input the battery capacity shortage signal from the immobilization control unit 69, in other words, when the capacity of the battery 51 is not short, the anti-theft control unit 1 sets as in the conventional case. In the state, the receiver 7 monitors the reception of the keyless identification number from the transmitter 39, collates the keyless identification number received by the receiver 7, and confirms that the collation result is not correct. , The trunk lid switch 13 and the tamper switch 15 (see FIG. 4) input signals, it is detected that the vehicle doors are opened.
3, 25, 27, a theft alarm command and operation are output to the anti-theft relay circuit 29 (see FIG. 4), and the security lamp 35 (see FIG. 4) is turned on. This allows the battery 5
If the capacity of 1 is not insufficient, the output of the theft alarm command is canceled to check the keyless identification number, that is, the alarm system is canceled.

On the other hand, the anti-theft control unit 1
When the battery capacity shortage signal is input from the immobilization control unit 69, in other words, the verification result of the key identification number held by the transponder chip 61 is proper, and the capacity of the battery 51 is insufficient. If the door key cylinder unlock switch 93 is turned on, the output of the theft alarm command is canceled.

Accordingly, if the battery capacity of the transmitter 39 for keyless remote control entry is equal to or larger than a predetermined value, the alarm system is released by collating the keyless identification number information transmitted by the transmitter 39, and the battery capacity is released. Is less than a predetermined value, instead of collating the keyless identification information, the key identification number of the transponder chip 61 is collated and the door key cylinder is unlocked. As a result, even if the capacity of the battery 51 of the transmitter 39 becomes less than or equal to a predetermined value, the regular vehicle key plate 63
The alarm system is released by using.

A warning indicator lamp 95 is connected to the anti-theft control unit 1, and the warning indicator lamp 95 is connected to the transponder chip 61.
Lights up when the alarm system is released due to the condition that the key identification number is checked and the door key cylinder is unlocked.

When the warning indicator lamp 95 is turned on, a warning that the battery capacity of the transmitter 39 is low is issued, and the user can know that it is time to replace the battery of the vehicle key plate 63. it can.

As another embodiment of the vehicle antitheft device according to the present invention, only a transponder chip having a key identification number unique to the vehicle is incorporated in the vehicle key plate 63, and the transponder chip is used in the immobilizer control unit as in the conventional case. It is also possible to permit or prohibit the starting of the vehicle prime mover based on the comparison result of the key identification information held by, and to release the alarm system based on the comparison result of the key identification number of the transponder chip. That is, the anti-theft control unit cancels the output of the theft alarm command if the verification result of the key identification information of the transponder chip is proper, and the vehicle opening / closing doors are opened under the condition that the verification result of the key identification information is not correct. In case of a burglar alarm, a theft alarm command may be output.

In this case, in the embodiment shown in FIGS. 1 to 3, the transmitter 39 of the vehicle key plate 63 is used.
And the information of the verification result of the key identification number from the transponder chip 61 may be transferred from the immobilizer control unit 69 to the anti-theft control unit 1, and the unlock switch 93 of the door key cylinder for the receiver 7 and the anti-theft control unit 1 may be transmitted. , And the warning indicator lamp 95 may be omitted.

Since the transponder chip 61 is supplied with electric power from the reader 65 by electromagnetic induction coupling, the transponder chip 61 does not fall into a malfunction state due to insufficient electric power. Therefore, the alarm system is released by using the regular vehicle key plate 63.

The key identification number of the transponder chip 61 is determined by tens of thousands of types of key identification numbers, which is equivalent to the keyless identification number, so that a high identification characteristic can be obtained even when the key identification number is verified. Further, since the transferable distance of the keyless identification number due to electromagnetic induction between the transponder chip 61 and the reader 65 is shorter than the transmittable distance of the key identification number by wireless communication, no misleading state occurs and the antitheft property is maintained. Further improve.

[0032]

As can be understood from the above description, according to the vehicle antitheft device according to the first aspect, the alarm system is released by collating the key identification information of the transponder chip which does not require a battery, so that the power consumption is reduced. The alarm system will not be released due to a shortage, and the structure will be simple and excellent anti-theft property will be obtained.

According to the vehicle antitheft device of the second aspect,
The immobilizer control unit prevents the vehicle from being stolen by self-propelled, and the alarm system is released by checking the keyless identification information transmitted by this transmitter if the battery capacity of the transmitter for keyless remote control entry is more than a predetermined value. If the battery capacity falls below a predetermined value, the keyless identification information is collated and the transponder chip key identification information is collated and the door key cylinder is unlocked. Even if it falls below the value, the alarm system will be released by using a regular vehicle key plate, and excellent anti-theft property will be secured.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an embodiment of a vehicle antitheft device according to the present invention.

FIG. 2 is a system connection diagram showing an embodiment of a vehicle antitheft device according to the present invention.

FIG. 3 is a block diagram showing a detailed structure of a reader, a transmitter of a vehicle key plate, and a transponder chip used in the vehicle antitheft device according to the present invention.

FIG. 4 is a system connection diagram showing an example of a conventional vehicle theft alarm device.

FIG. 5 is a system configuration diagram showing an example of a conventional vehicle self-propelling prevention theft prevention device.

FIG. 6 is a system connection diagram showing an example of a conventional vehicle self-propelled prevention theft prevention device.

FIG. 7 is a block diagram showing a detailed structure of a reader and a transponder chip of a vehicle key plate used in the conventional vehicle self-propelled antitheft device.

[Explanation of symbols]

1 Anti-safety control unit 3 Door key lock switch 5 Door lock status switch 9 Door switch 11 Hood switch 13 Trunk lid switch 15 Tamper switch 17 Theft warning horn 19 Horn 21 Headlamp 23, 25, 27 Relay circuit 29 Anti-theft relay circuit 31 Starter Motor 33 Inhibit relay circuit 35 Security lamp 37 Vehicle key plate 39 Transmitter 41 Microprocessor 43 Modulation circuit 45 Transmitting circuit 47 RF amplification circuit 49 Antenna 51 Battery 61 Transponder chip 63 Vehicle key plate 65 Reader 67 Engine control unit 69 Immobilization control Unit 71 Access controller 73 Contactless interface 75 Electromagnetic inductive coupling coil 77 Transmit Controller 79 Receive Recorder 81 Electromagnetic Induction Coupling Coil 90 EEPROM 91 Battery Monitor Circuit 93 Unlock Switch 95 Warning Indicator Lamp

Claims (2)

[Claims] 1. A vehicle key plate in which a transponder chip having vehicle-specific key identification information is incorporated, and the key identification information of the transponder chip is collated, and only when the collation result is proper, the starting of the vehicle prime mover is permitted. If the verification result of the immobilizer control unit for vehicle self-propelled anti-theft and the transponder chip is correct, the output of the theft alarm command is canceled, and the verification result of the key identification information of the transponder chip is incorrect. An anti-theft device for a vehicle, comprising: an anti-theft control unit that outputs a theft alarm command when the vehicle opening / closing doors are opened in a state. 2. A vehicle key plate incorporating a transponder chip having vehicle-specific key identification information and a transmitter for keyless remote control entry having vehicle-specific keyless identification information, and key identification information of the transponder chip. And an immobilizer control unit for vehicle self-propelled anti-theft prevention that permits the start of the vehicle prime mover only when the verification result is appropriate, and a reception for keyless remote control entry that receives the keyless identification information transmitted by the transmitter. And a theft control unit that collates the keyless identification information received by the receiver and outputs a theft warning command when the vehicle opening / closing doors are opened under a state in which the collation result is not appropriate, the transmission The machine is equipped with a battery capacity detector that detects the capacity of the self-powered battery. The chip has a storage unit for storing the battery capacity detected by the battery capacity detection unit, the immobilizer control unit receives the battery capacity information from the transponder chip, and based on the battery capacity information when the key identification information is properly collated. A battery capacity shortage signal is output to the antitheft control unit, and the antitheft control unit turns on the unlock switch of the door key cylinder instead of collating the keyless identification information only when the battery capacity shortage signal is input, thereby issuing a theft alarm command. The anti-theft device for vehicles, which is characterized by releasing the output of.