JP3410226B2 - Vehicle anti-theft device - Google Patents

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.

[0002]

2. Description of the Related Art In recent years, theft of vehicles has become frequent in various countries. To prevent this theft,
Conventionally, many alarm devices and the like have been proposed. As a system similar to such an alarm device, there is a keyless entry system or the like. As a keyless entry system, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 2-105469, a system in which an ID code transmitted from a transmitter is stored after a reset switch on a receiver side is turned on is proposed. Recently, a system called an immobilizer unit has been developed. This system is, for example, a device that prevents the engine from starting even if a robber enters the vehicle compartment and turns on the ignition switch.

Further, as disclosed in JP-A-64-56253, at least one of a means for collating a mechanical key and a means for collating an electronic code, and a means for detecting that the vehicle engine has started. When the engine is started, by providing the means for stopping the vehicle engine and the determination means for activating the engine stopping means when the verification result of the verification means does not match after detecting that the vehicle engine has started. There has been proposed a device for preventing the vehicle from being stolen not only when a duplicate key is used without impairing the operability but also when an engine is directly driven by direct connection of an electric system.

[0004]

However, in the conventional example configured as described above, for example, in the alarm device, the alarm device operates when the vehicle enters the interior of the vehicle. However, the alarm device operates. Even if they do, it has become a daily occurrence these days, and people passing by are not so impressed.

Further, in the keyless entry system, it is possible to prevent the vehicle from entering the interior of the vehicle, but, for example, once the window glass or the like is broken, it is difficult to turn on the ignition switch. is not. Further, the technique disclosed in Japanese Patent Laid-Open No. 64-56253 can prevent the vehicle from being stolen due to the direct connection of an electric system such as a duplicated key or starter motor. The driver himself was unable to start the engine, and it was necessary to carry other master keys as spares. In particular,
If you do not carry the spare key or if you lose or destroy all the spare keys, you can not move the vehicle unless you contact the dealer etc. to start the engine or you are traveling on an outing trip. At midnight, there was a risk that the vehicle would have to be left overnight.

Therefore, the vehicle antitheft device of the present invention is
This has been made in view of the above circumstances, and the purpose thereof is to prevent the use of the key by a third party to prevent the vehicle from being stolen and also to prevent the transmitter from being destroyed.
Even if the D code cannot be transmitted, the driver can perform a predetermined operation to start the engine using the key that cannot be transmitted, and the ID code is registered even if all the keys are lost. It is an object of the present invention to provide an antitheft device for a vehicle, which can easily reset the unique code of the key by performing a predetermined operation using a new key which is not present and can start the engine.

[0007]

In order to solve the above-mentioned problems and to achieve the object, a vehicle antitheft device of the present invention has the following configuration. That is, when the first code is received from the transmitter side, the first code is compared with the second code stored in the receiver side, and the first code and the second code match. A vehicle antitheft device comprising: a code determination unit that permits engine startup and prohibits engine startup when there is a mismatch; and an engine control unit that performs engine startup based on the determination result of the code determination means. The code determination unit and the engine control unit include means for determining whether or not a predetermined operation is performed by the driver, means for inhibiting the engine start when the predetermined operation is not performed, and the predetermined operation. If made, means for detecting the communication form of the code transmitted from the transmitter, and, if the communication form is normal, the code transmitted from the transmitter is stored in the engine control unit, If serial communication form is not normal, it characterized by comprising a control means for controlling said engine control unit to allow the engine starting.

Further, the first code from the transmitter side is received, and the first code and the second code stored in the receiver side are stored.
Of the vehicle including a code determination unit for permitting engine start when the first and second codes match and prohibiting engine start when the first and second codes do not match, and an engine control unit. In the prevention device, the code determination unit includes means for determining whether or not a predetermined operation is performed by a driver, means for inhibiting the engine start when the predetermined operation is not performed, and the predetermined operation. If
A means for detecting the communication form of the code transmitted from the transmitter, and storing the code transmitted from the transmitter when the communication form is normal, and permitting the engine start when the communication form is not normal And a control means for controlling so as to perform.

[0009]

As described above, since the vehicle antitheft device according to the present invention is constructed, the key is provided with a unique code, and the authenticity of the code transmitted from the transmitter is judged. Key to prevent the vehicle from being stolen, and even if the transmitter cannot be used to send the ID code and the ID code cannot be sent, if the driver performs a predetermined operation, the key cannot be sent. A vehicle antitheft device that can be used to start the engine.

[0010]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a system block diagram of a vehicle antitheft device according to an embodiment of the present invention.
The configuration of the vehicle antitheft device of the present embodiment will be described with reference to FIG. As shown in FIG. 1, the vehicle antitheft device used in this embodiment includes a transponder 1, an antenna 2 for receiving a signal from the transponder, and an antenna 2.
The system includes an amplifier 3 that amplifies a signal taken in by, an immobilizer unit 4 that is controlled by a signal from the amplifier, and an EGI unit 9 that controls an engine. More specifically, the transponder 1 is a key for turning on and off the ignition switch of the automobile on the driver side. Further, the antenna 2 is an ignition coil antenna that operates in conjunction with turning on and off of the ignition switch. In the amplifier 3, when this coil operates and a voltage is applied, the voltage is amplified to a constant value in order to obtain a high voltage.

The immobilizer unit 4, which is called an immobilizer unit, is a controller that has recently been developed in Europe for the prevention of theft and that prohibits engine starting. The immobilizer unit 4 is provided with ON / OFF information of the ignition switch based on the battery power supply (+ B) 14 and the switch power supply (IG1) 15, and the ID from the transponder 1 based on the voltage value amplified by the amplifier unit 3. Given the data, sends a predetermined control signal to the EGI unit. Further, since the immobilizer unit 4 is connected to the battery power source 14, for example, even if the engine is stopped and the ignition switch is turned off, the power is supplied and the standby state is maintained.

The EGI unit is a controller for controlling the engine speed, the fuel injection amount, and the like. The EGI unit 9 has an EEPROM 10 that stores data in advance, a RAM 11 that temporarily stores data when exchanging data with the immobilizer unit 4 described above, and data stored in these memories, as in the configuration of the immobilizer unit. And a CPU 13 that controls the transfer of data to and from the immobilizer unit 4 based on the timing information from the timer 12. Further, the EGI unit 9 is the immobilizer unit 4
A predetermined control signal is received from the control unit and the starter, the fuel injection amount, and the like are controlled based on the signal. Further, unlike the case of the immobilizer unit 4, the EGI unit 9 operates as the switch power supply 15 while interlocking with the on / off of the ignition switch. Therefore, for example, when the engine is stopped and the ignition switch is turned off, the power is turned off. It will be cut.

Next, with reference to FIG. 2 and FIG. 3, a procedure for transmitting / receiving data to / from the transponder 1, the immobilizer unit 4, and the EGI unit 9 will be described. FIG. 2 shows the ID of the transponder 1 having some unique ID data.
It is a figure explaining the judgment procedure of data. In addition, FIG.
It is a figure explaining the initial writing procedure of ID data in the assembly factory of the anti-theft device of this embodiment.

<Determination of ID Code> In FIG. 2, when the transponder 1 is inserted into the key hole and rotated to the position where the ignition switch is turned on, the immobilizer unit 4 issues an ID request to the transponder 1 and the transponder 1 sends it. An ID signal serving as a trigger signal for the immobilizer unit is transmitted to the immobilizer unit 4. The immobilizer unit 4 temporarily stores the transmitted ID code of the transponder 1 in the RAM 6 in the unit. Also,
This operation is repeated twice assuming a communication problem. Thereafter, the CPU 8 collates the ID code registered in the EEPROM 5 in the immobilizer unit with the ID code transmitted from the transponder 1. At this time, the EGI unit 9 is in a state of waiting for release of the immobilizer function from the immobilizer unit 4 side. In this state, the counter starts counting and determines whether a predetermined condition is satisfied within a predetermined time. If the predetermined conditions are satisfied, the EGI unit 9 transfers the IMOBI unit 4
Issue a D-code request. When the ID code request is issued from the EGI unit 9, the immobilizer unit 4 transmits the ID code to the EGI unit 9 based on the comparison result of the ID code. The EGI unit 9 stores the ID code from the immobilizer unit 4 in the RAM 11. This operation is 2
Repeatedly, ID code and EG from Immobili unit 4
The ID code registered in the EEPROM 10 in the I unit 9 is collated and the ID determination result is returned to the immobilizer unit 4.

<Initial Writing> Next, the initial writing procedure of data in a state where the ID code is not written in the EEPROM of each of the immobilizer unit 4 and the EGI unit 9 will be described. 3, when the transponder 1 is inserted into the key hole and rotated to a position where the ignition switch is turned on, the immobilizer unit 4 issues an ID request to the transponder 1 in FIG. For Immobility Unit,
Send an ID signal. In the immobilizer unit 4, the transmitted ID code of the transponder 1 is set in the RA of the unit.
It is temporarily stored in M6. In addition, this operation is repeated twice assuming a trouble during communication. After that, it is determined whether or not the ID code is already registered in the EEPROM 5 in the immobilizer unit. ID still in EEPROM5
If the code is not registered, I stored in RAM6
The D code is registered in the EEPROM 5. At this time, EG
The I unit 9 issues a request for the ID code to the immobilizer unit 4. When the ID code request is issued from the EGI unit 9, the immobilizer unit 4 makes the EGI unit 9
Send the ID code to. The EGI unit 9 stores the ID code from the immobilizer unit 4 in the RAM 11. This operation is repeated twice, and it is determined whether the ID code transmitted from the immobilizer unit 2 is the same code twice. If they are the same, E in the EGI unit 9
If the ID code is not yet registered in the EPROM 10, the ID is stored in the EEPROM 10 in the EGI unit 9.
Register your code. After that, a code registration reply is sent to the immobilizer unit 4.

<Operation of immobilizer unit when transmission by transponder is impossible> For example, if the transponder 1 fails for some reason and the ID code cannot be transmitted to the immobilizer unit 4, the engine cannot be started. However, in this embodiment, in order to avoid such a situation, the immobilizer unit 4 sets a pseudo ID code based on the transmission form of the signal from the transponder 1 so that the engine can be started. 4 is in control. More specifically, when the transponder 1 is normal, when the transponder 1 is inserted into the key hole and rotated to the position where the ignition switch is turned on as described above, the immobilizer unit 4
Issues an ID request to the transponder 1, and transmits an ID signal serving as a trigger signal for the immobilizer unit from the transponder 1 to the immobilizer unit 4. In contrast to this normal case, when the transponder 1 fails and the ID code cannot be transmitted, first, on the immobilizer unit 4 side,
Unable to receive ID signal from transponder 1 or ID
A warning lamp is used to warn the operator (driver) that the signal cannot be read. Upon receiving this warning, the operator (driver) recognizes the abnormality of the transponder 1. In this state, when the operator wants to start the engine and move the vehicle, the inserted transponder 1
For example, as shown in FIG. 17, after operating the door switch twice at intervals of about 1 second to 2 seconds, the door switch is further operated at intervals of about 1 second to 2 seconds with an interval of about 5 seconds to 7 seconds. Is operated 3 times, and the door switch is turned on once at intervals of about 1 second to 2 seconds with an interval of about 5 seconds to 7 seconds. Then, this signal is transmitted to the immobilizer unit 4. Imobi Unit 4
Then, by receiving this signal, it is determined that the code cannot be transmitted by the transmitter. Upon receiving the door switch signal, the immobilizer unit transmits a code (hereinafter, referred to as a third code) corresponding to the door switch signal to the EGI unit. Then EGI
When a response of ID code matching from the driver is received (EGI control will be described later) and the ignition on operation is performed by the driver's key within a predetermined time, whether the communication form of the signal transmitted from the key is normal or not. It is determined whether or not (see FIG. 17). Here, the signal communication form is normal means that the signal waveform representing the transmitted ID code is a non-registered code, and the signal communication form is not normal means that the code is not normal. This means that the signal waveform representing the ID code that has not been transmitted or has been transmitted is blunt. When the communication form is normal, the immobilizer CPU 8 erases the registered ID code, registers the transmitted ID code as a new code in the EEPROM 5, and at the same time, the EEPROM in the EGI unit 9
A command is also sent to 10 to register the ID code. On the other hand, if the communication form is not normal, a trouble occurs in the transmission system such as the transponder 1 and the operator is requesting the engine start, and the CPU 8
At, the engine start is permitted and the normal EGI control is performed. The ID code is also registered in the EEPROM 10 in the EGI unit 9. In the control operation described above, the method of starting the engine or registering the ID code using the key and the door switch integrated with the transmitter as the transponder has been described. For example, the ignition is turned on and off by the key. Alternatively, a brake switch or the like may be used instead to transmit a signal indicating a predetermined operation to the immobilizer unit side, or the operator may carry a card with a transmitter at all times.

By controlling the immobilizer unit as described above, even if a trouble occurs in the transmission system of the transponder 1 or the like and the ID code cannot be transmitted to the immobilizer unit side, the engine is started and the ID code is reset. Registration can be done easily. <ID Determination Procedure on Immobilizer Unit Side> Next, a specific ID code determination and initial writing procedure will be described with reference to FIGS.

FIG. 4, FIG. 5A, and FIG. 5B are flowcharts showing the ID code determination procedure on the immobilizer unit side. In the following description, it is assumed that the ID transmission from the transponder to the immobilizer unit includes the case of the transmitter failure described above. As shown in FIGS. 4 and 5, when the process is started, it is determined in step S2 whether or not the ignition switch is turned on by the transponder and the engine is started. If the ignition switch is turned on (YES in step S2), the process proceeds to step S4. If it is determined that the ignition switch is not turned on (NO in step S2), the process returns to the start point. In step S4, it is determined whether or not a predetermined condition (a stable state at an engine speed of 500 rpm and a voltage of 10 V or more) is satisfied. If the predetermined condition is satisfied in step S4 (YES in step S4), the process proceeds to step S6. On the other hand, if the predetermined condition is not satisfied in step S4 (NO in step S4), the process returns to the start point of step S4. In step S6, it is determined whether the ID request is issued from the EGI unit side. If it is determined in step S6 that the ID request is issued (YES in step S6), the process proceeds to step S8. If it is determined in step S6 that the ID request has not been issued (NO in step S6), the process returns to the start point of step S6. In step S8, an ID request is received from the EGI unit. Then, in step S10, I in step S8
According to the D request, the ID request is issued to the transponder.
Then, it progresses to step S12. In step S12, it is determined whether or not an ID reply from the transponder that issued the ID request is received. If a reply is received (YES in step S12), the process proceeds to step S14 and no reply is received. If (NO in step S12), the process proceeds to step S148 described later. afterwards,
In step S14, the ID response from the transponder is received. In step S16, the ID received from the transponder is stored in the RAM built in the immobilizer unit.
Store code temporarily. In step S18, the operations of the previous steps S8 to S16 are repeated again, and two I's received from the transponder are stored in the RAM.
The D code is stored, and the two stored ID codes are collated in step S20.

Then, in step S22, it is determined whether the two ID codes stored in the RAM match. The two I's stored in the RAM in step S22
If the D codes match (YES in step S22), the process advances to step S24. In step S24, it is determined whether or not the ID code is registered in the EEPROM incorporated in the immobilizer unit. In particular,
It is determined whether the ID code data has a value other than zero or F. In step S24, the EEP of the immobilizer unit
When the ID code is not registered in the ROM (NO in step S24), the process proceeds to step S26. In step S26, the ID code stored in the RAM is registered in the EEPROM of the immobilizer unit, and then the ID code is transmitted to EGI. After that, the process proceeds to step S28, and it is determined whether or not there is a response to the ID code transmission from the EGI unit. If there is a response from the EGI unit in step S28 (YES in step S28), the process proceeds to step S30. Step S30
Then, if the response from the EGI unit is OK, the indicator is turned off, and then the process returns to step S2. If there is no response from the EGI unit in step S28 (NO in step S28), the process returns to the start point of step S28.

On the other hand, if the two ID codes stored in the RAM in step S22 do not match (step S
(No in 22), the process proceeds to step S38, the immobilizer function is set, and the ignition is turned on (engine start).
Lock the immobilizer unit so that it cannot be performed and send a lock command to the EGI. If the ID code is registered in the EEPROM of the immobilizer unit in step S24 (YES in step S24), the process proceeds to step S32. In step S32, it is determined whether the ID code stored in the EEPROM is the ID code (maker code) set by the manufacturer. When the ID code stored in the EEPROM in step S32 is the unit maker code (determination in step S32 is Y
ES), and proceeds to step S28. On the other hand, step S32
If the ID code stored in the EEPROM is not the unit maker code in step (NO in step S32),
It proceeds to step S34. In step S34, it is determined whether the code stored in the RAM matches the code registered in the EEPROM. Step S
If it is determined that the codes match in 34 (YES in step S34), the process proceeds to step S36,
Release the immobilizer function to enable normal engine control. On the other hand, if the codes do not match in step S34 (NO in step S34), the process proceeds to step S38, and the immobilizer unit is locked so that the engine stops even if the immobilizer function is set and the ignition is turned on.

In the operation procedure on the immobilizer unit side described above, the procedure from step S24 to step 30 is I.
This is the initial writing procedure of the D code, and is from step S22.
The procedure from step S38 and step S32 to step S36 is a normal ID code determination procedure. <ID judgment procedure on the immobilizer side when the ID code cannot be transmitted>
Next, the ID code determination procedure when the ID code cannot be transmitted to the immobilizer unit due to the transponder failure described above will be described. FIG. 5B is a flowchart showing the ID code determination procedure on the immobilizer unit side when transmission is impossible. In step S12 shown in FIG. 4, if the ID response from the transponder is not received (NO in step S12), the process proceeds to step S148 in FIG. 5B. In step S148, it is determined that the ID code cannot be transmitted,
The warning lamp is turned on to notify the driver of the transponder failure. After that, it advances to step S150,
A signal indicating a predetermined operation by the driver's on / off operation of the door switch is input, and it is determined in step S152 whether or not the door switch is operated. In step S152, when there is an input by the driver's door switch on / off operation (YES in step S152),
In step S154, the third code indicating the predetermined operation registered in the immobilizer EEPROM 5 is transmitted to the EGI unit, and a command for comparing the third code with the fourth code stored in the EGI unit is issued. Send. Then, in step S156, EGI
It is determined whether or not there is a response of comparison and agreement from. In step S156, when the EGI returns a response for comparison, in step S158, the immobilizer function cancel command is transmitted to the EGI side. Then, step S1
In 60 and 162, the timer is turned on, and the code input by the key is performed on the immobilizer side. In step S164,
It is determined whether the code input in step S162 is received within a predetermined time, and if the code is received within the predetermined time in step S164 (step S164).
(YES in step S166), and it is determined in step S166 whether the communication mode of the signal input is normal. If the signal communication mode is normal in step S166 (YES in step S166), the registered ID code is cleared in step S168, the process proceeds to step S170, and the ID code input in step S162 is immobilized. Register in the side EEPROM 5. Then, in step S172, an ID clear command is transmitted to the EGI side. In step S174, it is determined whether a response from the EGI unit has been received. Step S174
When the response from the EGI unit is received at (YES at step S174), the process proceeds to step S176.
The ID code write command is transmitted to the EGI side. In step S178, after waiting for a response of write OK from the EGI unit to the write command, when the response is received, the process proceeds to step S180, the warning lamp is turned off, and the driver is informed of the completion of code writing.
In step S152, the driver's door switch is turned on,
If there is no input by the OFF operation (NO in step S152), the process returns to the start point. If the code is not received within the predetermined time in step S164 (NO in step S164), the process returns to the start point.

On the other hand, if the EGI response is not received in step S156, it is determined that the operation is not a proper operation by the driver, and the process proceeds to step S182 to set the immobilizer function and turn on the engine even if the ignition is turned on. The immobilizer unit is locked so as to be stopped, and a lock command is transmitted to the EGI in step S184. Also, step S1
If the signal communication mode is not normal at 66 (step S1)
(No in 66), the process proceeds to step S36, the immobilizer function is canceled, and normal engine control is enabled. Lock the immobilizer unit and send a lock command to the EGI.

(Registration of ID Code by Unregistered Key) When the driver loses all the keys and uses a new key, when the ID response from the transponder is received in step S12 shown in FIG. 4 (step S12). The determination is YES) and the process proceeds to step S38 of FIG. 5A. The operation thereafter is step S14 described in FIG. 5B.
It is similar to 8 to step S180.

As described above, in the operation procedure on the immobilizer unit side, the ID is
Even if the code cannot be sent or the key is lost, the unique code of the key can be easily reset by the prescribed operation, and the signal communication mode when resetting the code is normal. By determining whether or not the code can be transmitted by the transmitter, the engine can be started.

(ID Code Judgment Procedure Only with Immobilizer Unit) In the above embodiment, both the immobilizer unit and the EGI unit controlled the ID registration and engine start when the ID code cannot be transmitted. However, this control is performed only by the immobilizer unit. It is also possible to execute. In this case, when the immobilizer unit receives the door switch signal, the immobilizer unit determines whether or not the operation has been performed in the immobilizer unit, and if the ignition on operation is performed by the driver's key within a predetermined time, the key is transmitted from the key. It is determined whether the communication mode of the signal to be transmitted is normal. When the communication form is normal, the immobilizer CPU 8 erases the registered ID code,
EEPROM with the sent ID code as a new code
5 and EEPR in EGI unit 9
A command is also sent to the OM 10 to register the ID code. On the other hand, if the communication mode is not normal, it is determined that the operator is requesting the engine start, and the CPU
At 8, the engine start is permitted and the normal EGI control is performed.

<ID Judgment Procedure in EGI Unit> Next, the ID code judgment procedure in the EGI unit will be described. 6A, 6B, and 7 show I on the EGI unit side.
It is a flowchart which shows the determination procedure of a D code. Figure 6
A, 6B, and FIG. 7, when the process is started, in step S40, the timer counts 500 milliseconds after the ignition is turned on while waiting for the immobilizer function to be released and the ID request count to the immobilizer unit is zero. Start. In step S42, it is determined whether or not the immobilizer function is canceled. If the immobilizer function has not been canceled in step S42 (the determination in step S42 is N
O), the process proceeds to step S44, and if the immobilizer function is released (YES in step S42), the process proceeds to step S62 described below. In step S44, it is determined whether the immobilizer function is set. Step S4
If the immobilizer function is not set in step 4 (step S
If the determination at 44 is NO), the process proceeds to step S46. If the immobilizer function is set (YES at step S44), the process proceeds to step S140 described later in FIG. In step S46, it is determined whether the engine speed is 500 rpm or more and the voltage is 10 V or more as a predetermined condition. If the predetermined condition is satisfied in step S46 (YES in step S46), step S48
If the predetermined condition is not satisfied (NO at step S46), the process returns to the start point of step S46. In step S48, it started in step S40.
Determine if the 500 millisecond count is over. When the counting of 500 milliseconds is completed in step S48 (YES in step S48), step S50
If the count of 500 milliseconds has not been completed in step S48 (NO in step S48), the process returns to the start point of step S48. Step S5
At 0, the EGI unit issues an ID request to the immobilizer unit. After that, the process proceeds to step S52, and it is determined whether or not there is a reply of the ID code from the immobilizer unit to the EGI unit. ID from immobilizer unit in step S52
When it is determined that the code is returned (step S52)
If the determination is YES), the process proceeds to step S53 to temporarily store in the RAM 11 on the EGI side. After that, step S
Proceed to 56. In step S56, it is determined whether the ID code is registered in the EEPROM incorporated in the EGI unit. Specifically, it is determined whether the ID code data is zero or a value other than F. Step S5
When the ID code is already registered in the EEPROM of the EGI unit in 6 (YES in step S56), the process proceeds to step S58. In step S58, it is determined whether or not an additional write command has been received from the immobilizer unit. It should be noted that the additional write command for which the determination in step S58 is YES will be described later, and a description thereof will be omitted here. If the additional write command has not been received in step S58 (NO in step S58), the process proceeds to step S60, and the ID code stored in the RAM matches the ID code registered in the EEPROM of the EGI unit. Determine whether or not. When it is determined in step S60 that the ID code stored in the RAM matches the ID code registered in the EEPROM of the EGI unit (the determination in step S60 is YE
S), the process proceeds to step S62, the immobilizer function is released, and normal EGI control is executed. If the ID code stored in the RAM does not match the ID code registered in the EEPROM of the EGI unit in step S60 (NO in step S60), step S60
Proceed to 64. In step S64, it is determined whether the ID code stored in the EEPROM incorporated in the EGI is the ID code (maker code) set by the unit maker. If the ID code stored in the EEPROM is the maker code in step S64 (YES in step S64), the process proceeds to step S66 in FIG. If the ID code stored in the EEPROM is not the manufacturer code (NO at step S64),
It progresses to step S200 of FIG. 6B mentioned later.

<Initial Writing Procedure in EGI Unit>
Next, an initial writing procedure in the EGI unit will be described with reference to the flowchart of FIG. In FIG. 8, when the ID code is not registered in the EEPROM of the EGI unit in step S56 described in FIG. 7 (NO in step S56), the process proceeds to step S66. In step S66, it is determined whether or not the EGI unit has requested the ID code to the immobilizer unit twice or more. In step S66, the ID code request is 2
If performed more than once (YES in step S66
S), the process proceeds to step S68, and if the ID code request is not made more than once (when the code request is made once, step S
If the determination made in 66 is NO), the process returns to step S50 of FIG. 6A. In step S68, 2 stored in the RAM
It is determined whether one ID code is the same for both times. When the ID code stored in the RAM in step S68 is the same for both times (YES in step S68), the process proceeds to step S70, and the ID code stored in the RAM of the EGI unit is registered in the EEPROM. . Then, the process returns to step S62 in FIG. On the other hand, if the two ID codes stored in the RAM are not the same in step S68 (step S68).
If the determination at 68 is NO), the process returns to step S50 of FIG. 6A.

The procedure described above with reference to FIGS. 6A, 7 and 8 is the procedure for ID determination and initial writing of the ID code on the EGI unit side. FIG. 9 is a timing chart showing each operation of the transponder, the ignition switch, the immobilizer unit, and the EGI unit in the above-described ID code determination procedure. FIG. 10 is a timing chart showing each operation of the transponder, the ignition switch, the immobilizer unit, and the EGI unit in the initial writing procedure.

As described above, the manufacturer code is set for each immobilizer unit manufacturer or EGI unit manufacturer at the test stage in the factory, and the ID code can be set again by the dealer after assembly, which is excellent in mass productivity. Can be a unit. <ID determination procedure on the EGI side when the ID code cannot be transmitted>
Next, an ID code determination procedure on the EGI side when the ID code cannot be transmitted due to the transponder failure described above will be described. FIG. 6B shows the ID on the immobilizer unit side when transmission is impossible.
It is a flowchart which shows the determination procedure of a code. Figure 6A
If the ID response from the immobilizer unit has not been received in step S52 (No in step S52), the process proceeds to step S54 to determine whether or not a code comparison command has been received from the immobilizer unit. When a command is received in step S54 (step S54
If the determination is YES, the process proceeds to step S55. Step S
At 55, the reception of the third code transmitted from the immobilizer unit is waited for. When the reception of the third code transmitted from the immobilizer unit is received in step S55 (YES in step S55), the process proceeds to step S200 in FIG. 6B. Incidentally, the judgment is NO in steps S54 and S55.
In the case of, it returns to step S52. In step S200 shown in FIG. 6B, in accordance with the code comparison command in step S54, the third information transmitted from the immobilizer unit
It is determined whether the code matches the fourth code stored on the EGI unit side. This fourth code is
It is a code for the EGI side to judge when a predetermined operation is performed by the driver in a state where the ID code cannot be transmitted from the transponder. Now, in step S200, the third
If the code matches the fourth code stored on the EGI unit side (determined as YES in step S200)
S), the process proceeds to step S202. In step S202, a code matching reply is transmitted to the immobilizer unit. Then, it progresses to step S204 and waits for the immobilizer function cancellation command from the immobilizer unit. When the cancel command is received in step S204 (determination in step S204 is Y
ES), the process proceeds to step S206, and the immobilizing function is canceled. Next, in step S208, an ID code clear command from the immobilizer unit is waited for. Step S208
When it is determined that the clear command is received in step S208 (YES in step S208), the process proceeds to step S210, and the ID already registered in the EEPROM 10 on the EGI side is registered.
Clear the code. Then, the process proceeds to step S212, and waits for an ID code write command from the immobilizer unit. When it is determined that the write command is received in step S214 (determination is YES in step S212).
S), the process proceeds to step S214, where the EGI side EEPR
Register the ID code of the new key in the OM10. afterwards,
In step S216, the ID registration reply is transmitted to the immobilizer unit side, and the process returns to the start point of FIG. 6A.

On the other hand, in step S200, the third code is E
If the fourth code stored on the GI unit side does not match (NO at step S200), the process proceeds to step S218. In step S218, a code mismatch reply is transmitted to the immobilizer unit. Then, it progresses to step S220 and waits for the immobilizer function setting command from the immobilizer unit. When the cancel command is received in step S220 (YES in step S220), the process proceeds to step S222 to set the immobilizer function, and then, as illustrated in FIG.
Return to the start point of.

<Additional Writing Procedure> Next, the registered I
The procedure for rewriting the D code will be described. This is, for example, a transponder 1 with a different ID code,
2, 3, 4 (specifically, ID1, ID2, ID3, I
Among the keys 1, 2, 3, 4 each having D4, the keys 2, 3, 4 are stolen or lost so that a third party cannot use these lost keys to steal the car. This is a function used when preparing new keys 5, 6, and 7 and changing the ID codes registered in the immobilizer unit and the EGI unit. FIG. 11 is a diagram illustrating a procedure for rewriting an already registered ID code. Referring to FIG. 11, suppose that the ID code is I
A case will be described in which the items D1, ID2, ID3, and ID4 are changed to ID1, ID5, ID6, and ID7. In FIG. 11, since the ID code registered before the code change is valid for the key 1, first the key 1
To use. First, insert the key 1 into the key hole to start the engine, release the immobilizer function, and then turn the ignition switch on and off five times. By this operation, the immobilizer unit switches to the additional write mode, and the EEP built in each of the immobilizer unit and the EGI unit.
Among the codes ID1 to ID4 registered in the ROM, the ID codes other than the key 1 are cleared. After that, remove the key 1 and insert the ID 5 key 5 within a predetermined time (about 4 seconds).
Since the ID request is issued from the I unit to the immobilizer unit, the transponder 5 uses the ID 5 of its own.
To the Immobilizer. In Immobility Unit, I
The code of D5 is received and registered in the built-in EEPROM. After that, the immobilizer unit sets ID1 and ID5 to EGI in accordance with the ID request from the EGI unit.
Send to the unit side. The EGI unit receives the codes of ID1 and ID5 and registers them in the built-in EEPROM. After that, the ID is returned to the immobilizer unit, and the ID request is issued again. At this point, Imobi Unit and E
There are two ID codes registered in the GI unit, ID1 and ID5.

By the same procedure, after removing the key 5 of ID5 and inserting the key 6 of ID6 within a predetermined time, the transponder 6 and EGI are transferred from the immobilizer unit.
Since an ID request has been issued from the unit to the immobilizer unit, the transponder 6 transmits its own ID6 to the immobilizer unit. Since the EGI unit has issued an ID request to the immobilizer unit, a new ID
6 is transmitted to the immobilizer unit side. The immobilizer unit receives the code of ID6, and the built-in EEPROM
Register with M. After that, the immobilizer unit responds to the ID request from the EGI unit with ID1, ID5, and I.
And D6 to the EGI unit side. The EGI unit receives the codes of ID1, ID5 and ID6,
Register in the built-in EEPROM. After that, the ID is returned to the immobilizer unit and the ID is requested again. At this point, the ID code registered in the EGI unit is I
These are D1, ID5, and ID6.

Similarly, if the key 7 of ID7 is inserted within a predetermined time after the key 6 of ID6 is removed, the transponder 7 issues an ID request to the transponder 7 from the immobilizer unit and the transponder 7 from the EGI unit. 7 sends its own ID 7 to the immobilizer unit. Further, since the ID request is issued from the EGI unit to the immobilizer unit side, a new ID7 is transmitted to the immobilizer unit side. The immobilizer unit receives the ID7 code and registers it in the built-in EEPROM.
After that, the Immobilizer unit will receive the ID from the EGI unit.
According to the request, ID1, ID5, ID6, and ID7 are transmitted to the EGI unit side. In the EGI unit,
Receive the ID1, ID5, ID6 and ID7 codes,
Register in the built-in EEPROM. After that, the ID is returned to the immobilizer unit. At this point, the ID codes registered in the EGI unit are ID1, ID5, and ID6.
And ID7, and the change of ID code is completed.

<Additional writing procedure in immobilizer unit>
Next, a specific additional write procedure in the immobilizer unit will be described. 12 to 14 are flowcharts showing the additional writing procedure on the immobilizer unit side. Figure 1
2 to 14, when the process is started, step S
At 80, it is determined whether the ignition switch is turned on by the transponder. When the ignition switch is turned on (the determination in step S80 is YE
S), the process proceeds to step S82, and if it is determined that the switch is not turned on (NO in step S80), the process returns to the start point. In step S82, it is determined whether or not a predetermined condition (rotation speed 500 rpm, voltage 10 V or more) is satisfied after the engine is started. If the predetermined condition is satisfied in step S82 (YES in step S82), the process proceeds to step S84. On the other hand, step S8
If the predetermined condition is not satisfied in step 2 (NO in step S82), the process returns to the start point of step S82. In step S84, the ID is input from the EGI unit side.
Determine if the request is made. E in step S84
When the ID request is issued from the GI unit side (YES in step S84), the process proceeds to step S86. On the other hand, when the ID request is not issued from the EGI unit side in step S84 (the determination in step S84 is N
O), and returns to the start point of step S84. In step S86, the ID request in step S84 is received, and the ID request is issued to the transponder. Then, it progresses to step S88. In step S88, it is determined whether or not the ID response from the transponder is received, and when the response is received (YES in step S88),
If no response is received in step S90 (NO in step S88), the process returns to the start point of step S88 and the immobilizer function is set after the operation is performed a predetermined number of times or more or a predetermined time or more. . In step S90, a reply to the ID request from the EGI unit in step S84 is transmitted to the EGI unit. Then, it progresses to step S92. In step S92, the immobilizer unit issues an ID request to the EGI unit. In step S94, it is determined whether or not an ID code matching response is received from the EGI unit. Step S94
Then, when a response indicating that the ID code matches is received from the EGI unit (YES in step S94), the process proceeds to step S96. In addition, in step S94, when the ID code matching response is not received from the EGI unit (NO in step S94), the process returns at the start of step S94, and after a predetermined number of times or a predetermined time or more elapses. , Set the immobilizer function. Step S
At 96, it is determined whether or not the ignition switch is turned on and off five times with the inserted key in response to the ID match response from the EGI unit. Step S
If the ignition switch is turned on and off five times in 96 (YES in step S96), the process proceeds to step S98, and if the ignition switch is not turned on and off five times (the determination in step S96 is N.
O), additional write processing of ID is not performed, and step S
Return to 80. In step S98, it is determined whether or not a key that has been turned on and off five times within a predetermined time (for example, about 4 seconds) is removed, a key having another ID is inserted, and the ignition switch is turned on. If the ignition switch is turned on in step S98 (YES in step S98), step S10
If the ignition switch is not turned on (NO in step S98), the additional writing process of the ID is not performed and the process returns to step S80. After that, in step S100, the timer built in the immobilizer unit is reset, and in step S102,
Start the timer. Then, step S104
Proceed to. In step S104, the EGI unit outputs I
It is determined whether or not the D request is received. Step S104
If the ID request is received from the EGI unit (YES in step S104), step S1
Proceed to 06. On the other hand, if the ID request is not received from the EGI unit in step S104 (step S10).
If the determination in 4 is NO), the process returns at the start of step S104. In step S106, an ID response is transmitted to the ID request from the EGI unit, and in step S108, an additional write command is transmitted to the EGI unit. In step S110, the ID request is transmitted to the transponder in response to the ID request from the EGI unit. Then, in step S112, step S
It is determined whether a response from the transponder to the ID request at 110 is received. If a response from the transponder is received in step S112 (YES in step S112), step S114
Proceed to. On the other hand, in step S112, when the reply from the transponder is not received (step S1
If the determination in 12 is NO), the process returns to the start point of step S112. Then, it progresses to step S114. In step S114, the ID code transmitted from the transponder (another key) is stored in the RAM of the immobilizer unit. After that, in step S116, the processes of the previous steps S104 to S114 are repeated again, and the two ID codes stored in the RAM are collated,
In step S118, it is determined whether the two ID codes stored in the RAM match. Step S11
If the two ID codes stored in the RAM match in step 8 (YES in step S118), the process proceeds to step S120. On the other hand, in step S118, RA
If the two ID codes stored in M do not match (NO in step S118), step S11
Go to 0. In step S120, the Immobilizer unit R
The ID code stored in the AM is transmitted to the EGI unit. After that, in step S122, the EGI unit registers the ID code in the built-in EEPROM, and the immobilizer unit determines whether or not the additional write OK response is received from the EGI unit.
In step S122, when the response of the additional writing OK is received from the EGI unit (YES in step S122), the process proceeds to step S124. On the other hand, in step S122, when the response of the additional writing OK is not received from the EGI unit (the determination in step S122 is N
O), and returns at the start of step S122. In step S124, it is determined whether or not a predetermined time (for example, about 5 seconds) has elapsed. If the predetermined time has elapsed in step S124 (YES in step S124),
The process returns to step S80, and the additional writing of the ID code is executed or the ID code is determined. Also,
If the predetermined time does not elapse in step S124 (NO in step S124), the flow advances to step S126 to determine whether the ignition switch is off.
If the ignition switch is in the off state in step S126 (YES in step S126), the process returns to step S98. Also, step S126
If the ignition switch is not turned off (NO at step S126), step S
Return to 124.

<Additional Writing Procedure in EGI Unit>
Next, a procedure for additionally writing the ID code in the EGI unit will be described. FIG. 15 is a flowchart showing the additional writing procedure on the EGI unit side. Incidentally, in the additional writing procedure in this EGI unit, the processing between steps S40 to S58 of the flowcharts shown in FIGS. That is, in step S58 shown in FIG.
When the unit receives the additional write command (NO in step S58), step S shown in FIG.
Proceed to 130. The additional writing process is started from this step S130, and an ID request is issued to the immobilizer unit in step S130. In step S132, it is determined whether or not a response to the ID request transmitted in step S130 has been received from the immobilizer unit. When the ID response is received from the immobilizer unit in step S132 (the determination in step S132 is YE
S), and proceeds to step S134. On the other hand, step S13
If the ID response is not received from the immobilizer unit in step 2 (NO in step S132), step S13
Return to the beginning of 2. Then, step S13
At 4, it is determined whether or not one or more ID codes received from the immobilizer unit is the same as the ID code registered in the EEPROM of the EGI unit. If the same code is found in step S134 (YES in step S134), step S1
If there is no same code, go to 36 (step S13).
(No in 2), the process proceeds to step S140 to set the immobilizing function, and then the process returns to step S40 shown in FIG. In step S136, the EE of the EGI unit
Register a new ID code in PROM. Step S1
The new ID code in 36 means an ID code other than the same code determined in step S134. Then, in step S138, an additional write OK command for the ID code is transmitted to the immobilizer unit, and the process proceeds to step S62 in FIG. 7 described above, and the subsequent processing is the same as the procedure described with reference to FIGS. 6 and 7.

According to the procedure described above, the ID code is additionally written in the immobilizer unit and the EGI unit. The processing after step S50 in FIG. 6 and the processing after step S104 in FIG. 13 are synchronized between the units. FIG. 16 is a timing chart showing each operation of the transponder, the ignition switch, the immobilizer unit, and the EGI unit in the procedure of adding a key (changing the ID code and additionally writing). As shown in FIG. 16, the on / off timing of the ignition switch in step S96 described with reference to FIGS.
It takes about a second, and the operation is performed 5 times, and the additional keys are replaced within 4 seconds.

(Effect of Embodiment) As described above, even if the ID code cannot be transmitted due to the destruction of the transmitter, if the driver performs a predetermined operation, the key that cannot be transmitted is used. The engine can be started, and even if all the keys are lost, by performing a predetermined operation using a new key whose ID code is not registered, the unique code of that key can be easily reset, It can be started.

The present invention can be applied to modifications and variations of the above embodiments without departing from the spirit of the present invention. For example, the antitheft device of this embodiment is realized by both the immobilizer unit and the EGI unit, but a system may be constructed so that either one of the devices performs processing.

It goes without saying that, for example, the determination of the ID code and the predetermined operation and timing time for resetting the ID code when the transmitter fails can be arbitrarily set.

[0040]

As described above, according to the vehicle antitheft device of the present invention, the key is provided with a unique code, and the authenticity of the code transmitted from the transmitter is determined.
If the driver performs a predetermined operation even if the transmitter cannot be used to prevent the vehicle from being stolen and the transmitter is destroyed and the ID code cannot be transmitted, the key cannot be transmitted. It is an object of the present invention to provide a vehicle antitheft device capable of starting an engine by using.

[Brief description of drawings]

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

FIG. 2 is a diagram illustrating a procedure for determining ID data of a transponder 1 having certain unique ID data.

FIG. 3 is a diagram illustrating an initial writing procedure of ID data in an assembly factory of the anti-theft device of the present embodiment.

FIG. 4 is a flowchart showing an ID code determination and initial writing procedure on the immobilizer unit side.

FIG. 5A is a flowchart showing an ID code determination and initial writing procedure on the immobilizer unit side.

FIG. 5B is a flowchart showing a procedure for determining and writing an ID code on the immobilizer unit side when the ID code cannot be transmitted.

FIG. 6A is a flowchart showing an ID code determination procedure on the EGI unit side.

FIG. 6B is a flowchart showing the ID code determination and writing procedure on the EGI unit side when the ID code cannot be transmitted.

FIG. 7 is a flowchart showing an ID code determination procedure on the EGI unit side.

FIG. 8 is a flowchart showing an initial writing procedure in the EGI unit.

FIG. 9 is a transponder, an ignition switch, an immobilizer unit, and an EGI in the ID code determination procedure.
It is a timing chart which shows each operation of a unit.

FIG. 10 is a timing chart showing each operation of the transponder, the ignition switch, the immobilizer unit, and the EGI unit in the initial writing procedure of the ID code.

FIG. 11 is a diagram illustrating a procedure for rewriting an already registered ID code.

FIG. 12 is a flowchart showing an additional writing procedure on the immobilizer unit side.

FIG. 13 is a flowchart showing an additional writing procedure on the immobilizer unit side.

FIG. 14 is a flowchart showing an additional writing procedure on the immobilizer unit side.

FIG. 15 is a flowchart showing an additional writing procedure on the EGI unit side.

FIG. 16 is a timing chart showing each operation of a transponder, an ignition switch, an immobilizer unit, and an EGI unit in a key addition (ID code change, additional writing) procedure.

FIG. 17 is a timing chart showing an example of a pseudo code setting method using an engine key.

[Explanation of symbols]

1 ... Transponder, 2 ... Ignition coil antenna, 3 ... Amplifier, 4 ... Immobilizer unit, 5 ... Immobilizer side EEPROM, 6 ... Immobilizer side RAM, 7 ... Immobilizer side timer, 8 ... Immobilizer side CPU, 9 ... EGI unit, 10 ... EGI unit side EEPROM, 11 ... EG
I unit side RAM, 12 ... EGI unit side timer,
13 ... EGI unit side CPU, 14 ... Immobilizer unit side power supply, 15 ... EGI unit side power supply.

Front page continued (72) Inventor Yutaka Tagawa 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (56) References JP-A 64-56253 (JP, A) (58) Fields investigated (58) Int.Cl. ⁷ , DB name) B60R 25/00-25/00

Claims (12)

(57) [Claims] 1. The first code is received from the transmitter side, and the first code and the second code stored in the receiver side are compared, and the first code and the second code are compared with each other. Anti-theft vehicle protection including a code determination unit that permits engine startup if they match, and prohibits engine startup if they do not match, and an engine control unit that executes engine startup based on the determination result of the code determination means In the device, the code determination unit and the engine control unit are means for determining whether or not a predetermined operation is performed by a driver, a means for prohibiting the engine start when the predetermined operation is not performed, and Means for detecting a communication form of the code transmitted from the transmitter when a predetermined operation is performed; and a code transmitted from the transmitter to the engine control unit when the communication form is normal. Is 憶, the case where the communication mode is not normal, anti-theft device for a vehicle, characterized by comprising control means for controlling said engine control unit to allow the engine starting. 2. The code determination unit transmits a third code to the engine control unit when the predetermined operation is performed, and the engine control unit stores the third code and the engine control unit. The anti-theft device for a vehicle according to claim 1, further comprising means for comparing the generated fourth code. 3. The first code and the third code are:
The anti-theft device for a vehicle according to claim 2, wherein the same code is used. 4. The vehicle according to claim 3, wherein the transmitter is formed integrally with an engine key, and the first code or the third code is transmitted from the engine key. Anti-theft device 5. The vehicle antitheft device according to claim 1, wherein the predetermined operation is an on / off operation of an ignition switch by an engine key. 6. The vehicle antitheft device according to claim 1, wherein the predetermined operation is a door switch operation by a driver. 7. The vehicle antitheft device according to claim 1, wherein the predetermined operation is a brake switch operation by a driver. 8. The first code is received from the transmitter side, the first code and the second code stored in the receiver side are compared, and the first code and the second code are compared with each other. A theft prevention device for a vehicle, comprising: a code determination unit that permits engine startup if they match and prohibits engine startup if they do not match; and the code determination unit, wherein the code determination unit performs a predetermined operation by a driver. Means for determining whether or not the predetermined operation is performed, means for prohibiting the engine start when the predetermined operation is not performed, and a communication mode of a code transmitted from the transmitter when the predetermined operation is performed And a control unit that stores a code transmitted from the transmitter when the communication mode is normal, and controls to permit the engine start when the communication mode is not normal. Vehicle anti-theft device characterized by. 9. The vehicle anti-theft device according to claim 8, wherein the transmitter is formed integrally with an engine key. 10. The vehicle antitheft device according to claim 8, wherein the predetermined operation is an on / off operation of an ignition switch by the engine key. 11. The vehicle antitheft device according to claim 8, wherein the predetermined operation is a door switch operation by a driver. 12. The vehicle antitheft device according to claim 8, wherein the predetermined operation is a brake switch operation by a driver.