JPH0911858A - Alarm system for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate fear for runout of a battery by providing an alarm releasing means to stop actuation of an alarm means and an engine starting preventive means when these coincide with each other by checking it with a checking ID code by reading in the ID code stored in a transponder element. SOLUTION: A CPU 16 is provided with a transmitting receiving function to transmit and receive data or the like between it and an IC 10 in an engine key 11 through an antenna 13, an ID code checking judging function to check and judge a key ID code, a rolling ID code preparing function to prepare a new ID code, a theft detecting function detect an action of a vehicle theft and a function of setting, actuating and unsetting an alarm. An alarm system is automatically set by ordinary getting off action of a user, and a key ID code is stored, and a transponder element (IC) 10 is built in the engine key 11, and the alarm system is released by checking the ID code.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle alarm system for preventing vehicle theft.

[0002]

2. Description of the Related Art In recent years, with a slight increase in theft of vehicles, there has been an increasing interest in vehicle alarm systems for preventing theft of vehicles. Under such circumstances, the demand for this system is also increasing, and there is a demand for more convenient, easy-to-use and highly reliable systems.

In many cases, a conventional vehicle alarm system adopts a wireless system, and a remote control device (transmitter) serves to lock / unlock the door from a place where the user is away from the vehicle. Set / unset is performed.

[0004]

However, in such a conventional vehicular alarm system as described above, normally,
Since the remote control device has a battery as a power source, it may run out of battery. Therefore, for example, when the battery is almost dead, it is necessary to replace the battery, which is troublesome in terms of convenience. There was a face. In addition, if the battery is accidentally discharged, the alarm system cannot be activated until the battery is replaced, and there is a possibility that a blank will occur in terms of reliability. Further, since the remote control device usually has buttons for setting / unsetting, it is necessary to push those buttons when using it. Therefore, when the luggage is held in both hands, for example, it is difficult to operate. There was something inconvenient.

The present invention has been made in view of the above problems of the prior art, and provides a vehicle alarm system which is free from the danger of running out of battery and is excellent in convenience, operability and reliability. With the goal.

[0006]

In order to achieve the above object, the invention according to claim 1 is an opening / closing detecting means for detecting opening / closing of an opening / closing portion of a vehicle, an alarm means for issuing a theft alarm, and an engine start. And an alarm for activating the alarm means and the engine start prevention means when the opening / closing section detects that the opening / closing part is opened in an alarm setting state set when getting off the vehicle. Control means and ID for alarm release
A transponder element for storing a code in a readable / writable manner, an access means for accessing the transponder element to exchange data, and an ID stored in the transponder element by the access means when an accessory switch is turned on. It is characterized in that it has an alarm releasing means for reading the code, collating it with the ID code for collation, and stopping the operation of the alarm means and the engine start preventing means when they coincide.

According to a second aspect of the present invention, in the vehicle alarm system according to the first aspect, the transponder element is built in an engine key, and the access means is provided around a key cylinder. Characterize.

According to a third aspect of the present invention, in the vehicle alarm system according to the first aspect, the ID code stored in the transponder element and the ID code stored in the transponder element when the alarm canceling means determines that the ID codes match. It is characterized by having an ID code creating means for creating an ID code for rewriting the ID code for collation to a different one from the current one.

[0009]

According to the present invention having the above-mentioned structure, when the opening / closing detection means detects that the opening / closing portion of the vehicle is opened in the alarm setting state set at the time of getting off the vehicle, an alarm is issued. The control means actuates the alarm means and the engine start blocking means. At this time, the alarm means issues a theft alarm to inform the user that there is a risk of vehicle theft, and the engine start prevention means prevents the engine from starting even if the engine key is turned. When canceling the alarm setting state when getting on the vehicle, the alarm cancellation means reads the ID code stored in the transponder element by the access means when the accessory switch is turned on, and the read ID code is an ID code for collation. And the alarm means and the engine start prevention means are deactivated when they match. At that time, the transponder element is battery-less, automatically receives the magnetic field energy from the access means, and transmits the stored ID code to the access means.

According to the second aspect of the present invention, the transponder element is built in the engine key and the access means is provided around the key cylinder, so that the access to the transponder element can be made only by inserting the engine key into the key cylinder. It will be possible and you only have to operate the engine key normally.

According to another aspect of the invention, the ID code creating means stores the ID code stored in the transponder element and the alarm releasing means when the alarm releasing means determines that the ID codes match. An ID code is created to rewrite the matching ID code that has been used to a different one from the current one. The created ID code is updated and registered in the transponder element and the alarm releasing means. That is, since the ID code is automatically rewritten each time it matches as a result of collation, it is practically impossible to decipher the ID code, and reliability is improved in terms of vehicle theft prevention.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a vehicle alarm system according to an embodiment of the present invention. This alarm system detects that the window glass (including the sunroof) has been cracked while parking and that the door, bonnet, and trunk (including the sunroof) have been pry open, and the siren will automatically notify the user. It has a function to issue an alarm and prevent the engine from starting, and does not require a battery in place of the conventional remote control device (transmitter) with a built-in battery to set / unset the alarm system. A system is constructed using transponder elements. That is, an engine key 11 incorporating an IC 10 that constitutes a transponder element, an antenna 13 integrally installed around the key cylinder 12, and a receiver 1 connected to the antenna 13.
And 4. The receiver 14 is installed, for example, in the vehicle compartment.

The IC 10 built in the engine key 11 is composed of a transponder element as described above. As is well known, the transponder element is capable of transmitting and receiving data in a contactless manner by receiving energy from an external magnetic field without a power source (batteryless). The transponder element includes functional units such as an antenna (coil), a memory, a control unit, and a contactless interface. The memory is composed of, for example, an EEPROM which is a non-volatile memory whose stored contents can be electrically rewritten. This memory has a key I for releasing the alarm.
The D code is stored. This key ID code is a 48-bit rolling ID code as described later. The IC 10 having the above-described structure can generate magnetic field energy from the outside (for example, 125 k via the built-in antenna).
Hz)), starts up, sends the key ID code stored in the memory, and receives a new key I received from the outside.
It has a function of updating and registering the D code in the memory. The communicable range of the transponder element is usually at maximum, for example 3-5 cm.

The antenna 13 provided around the key cylinder 12 functions as an access means and is connected to the receiver 14 by two lines (for data-in and data-out). . The antenna 13 emits magnetic field energy (125 kHz) when communicating with the IC 10 in the engine key 11, reads the key ID code stored in the IC 10, and sends it to the receiver 14 via the data-in line. On the contrary, it has a function of transmitting a new key ID code sent from the receiver 14 via the data-out line to the IC 10 in the engine key 11. Note that, here, the antenna 13 and the receiver 14 are connected by two lines, but the present invention is not limited to this, and it goes without saying that one line may be shared.

The key cylinder 12 has a built-in key switch. The key switch has an OFF position where the engine key 11 is just inserted into the key cylinder 12, an accessory (ACC) position for supplying electric power to electric components, an ignition (IG) position for starting the engine, and a starter motor for rotation. There is a start position to let.

In this embodiment, the IC (transponder element) 10 is built in the engine key 11 and the antenna 13 is provided around the key cylinder 12, but this is merely an example. For example, a coin-type IC (transponder element) is hung on an engine key like a key chain, and is hung when the engine key is inserted into a key cylinder.
The antenna may be installed at a position where it can communicate with (not necessarily around the key cylinder).

The receiver 14 functions as an alarm control means, an alarm canceling means, and an ID code creating means, and is an EEPROM 15 which is a non-volatile memory whose stored contents can be electrically rewritten, and various control calculation processes. And a CPU 16 for executing. In addition to the operation program of the receiver 14, the EEPROM 15 stores an ID code (48-bit rolling ID code) for collation that is the same as the key ID code stored in the IC 10 in the engine key 11. CPU 16 is receiver 1
4, which is the center of the operation, will be described later.

On the input side of the receiver 14, a door sensor 1 as opening / closing detecting means for detecting opening / closing of a door, a hood and a trunk, which are opening / closing portions of the vehicle, is provided.
7, a bonnet sensor 18, and a trunk sensor 19 are connected. Furthermore, a shock or intrusion sensor 20 for detecting that the window glass or the like has been broken is also connected.
On the other hand, on the output side of the receiver 14, a siren 21 and a clearance lamp 22 are connected as an alarm means, and
A starter motor cut device 23, an ignition cut device 24, and a fuel pump cut device 25, which constitute an engine improper start prevention device (immobilizer), are connected as engine start prevention means. The theft alarm is notified to the user by sounding the siren 21 and blinking the clearance lamp 22. The starter motor cutting device 23 cuts off the power supply to the starter motor, the ignition cutting device 24 cuts off the transmission of the ignition ON signal from the key switch to the engine control device, and the fuel pump cutting device 25 The fuel pump is provided with an immobilizer relay (hereinafter, abbreviated as immobilizer relay) for turning on / off each operation of the fuel pump. For example, each of these immobilizer relays 23
-25 are normally closed break contacts (b contacts) that open when ON operation and close when OFF operation,
When a signal is input from the receiver 14, it is turned on to open the circuit to cut off the energization to the starter motor, cut off the transmission of the ignition ON signal, and cut off the energization to the fuel pump, that is, operate the immobilizer. In the present embodiment, the immobilizer relays 23 to 25 are installed outside the receiver 14, but the present invention is not limited to this, and all or part of them may be installed inside the receiver 14. Of course, you can.

The CPU 16 has a function of setting an alarm system when getting off the vehicle (hereinafter, a state in which the alarm system is set is referred to as an alarm setting state), and an alarm is issued when a vehicle theft is detected in the alarm setting state and an immobilizer is activated. It has a function to operate and a function to cancel (unset) the alarm setting state when getting on. Details of these operations will be described later. Also, focusing on individual functions, the CPU 16 (or the receiver 14)
Is the IC1 in the engine key 11 via the antenna 13.
Transmission / reception function for transmitting / receiving data to / from 0, ID code collation determination function for collation determination of key ID code, rolling ID code generation function for generating new ID code, and theft for detecting vehicle theft Detection function,
It has a function of setting / operating / unsetting an alarm.

The new key ID code is created by a random number and is, for example, a 48-bit rolling ID code. The new ID code created by the CPU 16 is EEP
The ROM 15 and the IC 10 in the engine key 11 are updated and registered.

A vehicle battery is connected to the receiver 14 as a power source.

Next, the operation of the present system configured as described above will be described using a flow chart. 2 is an operation flowchart when an alarm is set, FIG. 3 is an operation flowchart of alarm control in an alarm setting state, and FIG. 4 is an operation flowchart when an alarm is released. Note that FIG.
3 is a schematic diagram collectively showing each operation of FIG. 3, and FIG. 6 is a schematic diagram collectively showing the operation of FIG.

First, the operation of the alarm system set (alarm set) will be described with reference to FIGS. 2 and 5. At the time of getting off, the CPU 16 turns the engine key 11 inserted in the key cylinder 12 to the OFF position by a signal from the key switch to turn the accessory (AC
C) is turned off (step S10), the door sensor 17
When it is detected that the door is once opened and then closed by the signal from (step S11, step S1
2) Start a timer (step S13), and wait for a predetermined time (for example, 30 seconds) (step S1).
4) The alarm system is automatically set (step S15). On the other hand, when it is detected that the door is opened again (step S14) before the predetermined time (30 seconds) has elapsed (step S16), the timer is reset (step S17) and the process returns to step S12. In any case, the alarm system is automatically set after a predetermined time (30 seconds) has passed since the accessory was turned off and the door was opened and closed.

Next, the alarm control operation in the alarm setting state will be described with reference to FIGS. 3 and 5. With the alarm system set as described above, C
The PU 16 receives the bonnet and / or the bonnet sensor 18 and / or the trunk sensor 19 based on the signals from the bonnet sensor 18 and / or the trunk sensor 19.
Alternatively, when it is detected that the trunk has been opened (step S20), it is determined that the bonnet and / or the trunk has been illegally opened, and the siren 21 is sounded for a predetermined time (for example, 60 seconds) and the clearance lamp 22 Is turned on to issue a theft alarm to the user or the like (step S21), and in order to operate the immobilizer, the immobilizer relays 23 to 25 are turned on to prevent the engine from starting (step S2).
2). Although not shown in FIG. 3, even when it is detected that the window glass or the like is broken by a signal from the shock or the intrusion sensor 20, the same process as steps S21 and S22 is performed.

On the other hand, according to the signal from the door sensor 17,
When it is detected that the door is opened (step S2
3) After the clearance lamp 22 is turned on for a predetermined time (for example, 15 seconds), if the alarm cancellation process is not performed (see FIG. 4), it is determined that the door has been pry open illegally, and step S21 is performed. Same time as 60 seconds
During this period, the siren 21 is sounded, the clearance lamp 22 is turned on (step S24), and the immobilizer relays 23 to 25 are turned on to operate the immobilizer (step S22).

Finally, the operation of alarm system unset (alarm cancellation) will be described with reference to FIGS. 4 and 6. Upon boarding the vehicle, when the CPU 16 detects from the signal from the door sensor 17 that the door is opened (step S30), the CPU 16 turns on the clearance lamp 22 for a predetermined time (15 seconds) (step S31), and then the clearance lamp 22. During the predetermined time (15 seconds) when is lit,
By the signal from the key switch, the engine key 11 is inserted into the key cylinder 12 and the accessory (AC
C) It is determined whether the accessory is turned to the position and turned on (step S32).

As a result of this judgment, a predetermined time (15 seconds)
If the accessory is turned on within the time, the key ID is verified by comparing the key ID code and the key ID by the rolling ID code.
Rewrite the code. That is, Immobilizer relay 2
With 3 to 25 kept ON, 125 kHz magnetic field energy is generated from the antenna 13 to activate the IC 10 in the engine key 11, and the 48-bit key ID code stored in the IC 10 is transmitted via the antenna 13. Read (step S33). The key ID code read in step S33 is collated with the collation ID code stored in the EEPROM 15, and it is determined whether or not they match (step S34).

If the result of this determination is OK, that is, if the key ID codes match, a new 48-bit key ID code is generated by generating a random number in order to replace the current key ID code with a new key ID code. (Step S35), the new key ID code is written in the IC 10 and the EEPROM 15 of the engine key 11, the current key ID code is updated and registered as a new key ID code, and the registered key ID code is re-registered. It is confirmed whether the information has been read and registered correctly (step S36). Then, the immobilizer relays 23 to 25 are turned off to stop the operation of the immobilizer so that the engine can be started as usual (step S).
Along with 37), the lighting of the clearance lamp 22 is stopped (step S38).

On the other hand, if the result of determination in step S34 is NG, that is, if the key ID codes do not match, the alarm control shown in FIG. 3 is entered (step S3).
9) The siren 21 is sounded and the clearance lamp 22 is turned on, and at the same time, the immobilizer is kept in the ON state so that the engine cannot be started.

When the accessory is not turned on within the predetermined time (15 seconds) as a result of the determination in step S32, the siren 21 is sounded and the clearance lamp 22 is turned on (step S40), and then the steps S33-steps are started. Similar to S36, the key ID code collation determination and the rewriting processing by the new key ID code are performed, and when the processing is properly completed (steps S41 and S42), the immobilizer relays 23 to 25 are turned off to operate the immobilizer. Is stopped so that the engine can be started (step S43), and the sound of the siren 21 and the lighting of the clearance lamp 22 are stopped (step S44).

Therefore, according to the present embodiment, the alarm system is automatically set by the normal dismounting operation by the user, and the transponder element (IC) 10 storing the key ID code is built in the engine key 11 and the ID is set. Since the alarm system is canceled by checking the code, the user does not need to do any special operation when setting / unsetting the alarm system, and there is no need to worry about running out of battery.
Operability and convenience are improved. In addition, the reliability of the alarm system set is improved because the blank state of the alarm system set due to the battery exhaustion disappears.

The sensor for detecting the vehicle theft, the alarm means, and the engine start preventing means are not limited to those of the present embodiment, and it is possible to construct an alarm system using any appropriate element. Of course.

[0033]

As described above, according to the invention described in claim 1, since the alarm system is configured by using the transponder element, there is no need to worry about running out of battery or special operation, and convenience and operability are provided. , Reliability is improved.

According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the access to the transponder element is possible only by inserting the engine key into the key cylinder, the engine key can be operated normally. All that is required is to further improve the operability.

According to the invention of claim 3, in addition to the effect of the invention of claim 1, the ID code is automatically rewritten every time the ID code matches as a result of the collation, so that the ID code is actually decoded. Is almost impossible, and the reliability is further improved in terms of preventing vehicle theft.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a vehicle alarm system according to an embodiment of the present invention.

FIG. 2 is an operation flowchart of the system of FIG. 1 when an alarm is set.

3 is an operation flowchart of alarm control in the alarm setting state of the system of FIG.

FIG. 4 is an operation flowchart of the system of FIG. 1 when an alarm is released.

FIG. 5 is a schematic diagram in which each operation in FIGS. 2 and 3 is summarized and schematically shown.

FIG. 6 is a schematic diagram schematically showing the operation of FIG. 4 together.

[Explanation of symbols]

10 ... IC (transponder element) 11 ... Engine key 12 ... Key cylinder 13 ... Antenna (access means) 14 ... Receiver (alarm control means, alarm cancellation means,
ID code creating means) 15 ... EEPROM 16 ... CPU 17 ... Door sensor (opening / closing detecting means) 18 ... Bonnet sensor (opening / closing detecting means) 19 ... Trunk sensor (opening / closing detecting means) 20 ... Shock or intrusion sensor 21 ... Siren (alarming means) 22 ... Clearance lamp (alarm means) 23 ... Starter motor cut device (engine start blocking means) 24 ... Ignition cut device (engine start blocking means) 25 ... Fuel pump cut device (engine start blocking means)

Claims (3)

[Claims] 1. Opening / closing detecting means (17, 18, 19) for detecting opening / closing of an opening / closing portion of a vehicle, warning means (21, 22) for issuing a theft alarm, and engine start blocking means (blocking start of an engine). Two
3, 24, 25) and the alarm means (2) when the opening / closing section is detected by the opening / closing detection means (17, 18, 19) in the alarm setting state set when getting off the vehicle.
1, 22) and the engine start prevention means (23, 2)
4, 25), an alarm control means (14), a transponder element (10) for storing an ID code for alarm release in a readable / writable manner, and a data exchange by accessing the transponder element (10). Access means (13) for performing, and the transponder element (10) by the access means (13) when an accessory switch is turned on.
Read the ID code stored therein, collate it with a collating ID code, and when they match, actuating the alarm means (21, 22) and the engine start blocking means (23, 24, 25). An alarm releasing means (14) for stopping the vehicle alarm system, and an alarm system for a vehicle. 2. The transponder element (10) is built into an engine key (11) and the access means (13) is provided around a key cylinder (12). The vehicle alarm system described. 3. The ID code stored in the transponder element (10) when the alarm canceling means (14) determines that the ID codes match, and the ID code for verification are different from the current ones. The vehicle alarm system according to claim 1, further comprising: an ID code creating means (14) for creating an ID code for rewriting the same.