JP2000108848A - Immobilizer apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform sure internal ID code rewriting. SOLUTION: An immobilizer ECU 26 sends a code based on an internal ID code stored in an EEPROM 28 to an engine ECU 30 when a key ID code sent from a key 10 is correct. The engine ECU 30 makes checking on whether the internal ID code using the immobilizer ECU 26 is the same as that of an EEPROM 32 or not. When any one of the immobilizer ECU 26 and the engine ECU 30 is changed, a switch 40 is turned ON, and under the ON-condition of this switch 40, communications are carried out between the immobilizer ECU 26 and the engine ECU 30, and the same internal ID code is written in the EEPROM 28 and 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an immobilizer ECU for collating a key ID code sent from a key and transmitting an internal ID code to an engine ECU.
An immobilizer device including an engine ECU that performs collation of the internal ID code received from the immobilizer ECU and controls engine start based on the collation result, in particular, an EC.
It relates to the process of matching internal ID codes when U is exchanged.

[0002]

2. Description of the Related Art Conventionally, an immobilizer device is known as a device for preventing a vehicle from being stolen due to an illegal engine start operation. In this immobilizer device, the ID is communicated with an ignition key having a built-in communication device.
When the code (key ID code) is verified, the start of the engine is permitted. For this purpose, the immobilizer device includes an immobilizer ECU that communicates with the key and checks a key ID code sent from the key, and an engine ECU that communicates with the immobilizer ECU and controls the start of the engine. Have. If the ID code verification using a valid key is not completed, the engine ECU cuts off the fuel supply to the engine and prohibits ignition by the ignition device, thereby prohibiting the engine from starting and preventing theft. I do.

[0003] In order to prevent the engine ECU from easily starting when the immobilizer ECU is removed, communication and collation processing using an ID code (internal ID code) is performed between the immobilizer ECU and the engine ECU. Has been done. Therefore, when the immobilizer ECU or the engine ECU is replaced, a process for matching the internal ID codes used between the two is required.

Therefore, the ignition switch is turned on,
A method has been proposed in which the internal ID codes of the two ECUs are matched when a special condition that the state where the engine speed is 0 and the vehicle speed is 0 continues for a predetermined time (for example, about 30 minutes) is satisfied. ing.

[0005]

Here, such a condition may occur even when the ECU is not replaced. When the process for matching is completed, the internal ID code is simply rewritten and there is no problem. However, if the ignition switch is turned off at the end of the rewriting of the internal ID code, the internal ID codes in the two ECUs do not match, and the engine cannot be started.

In Japanese Patent Application Laid-Open No. Hei 10-53106, when data is not stored in an area where an internal ID code of one of the ECUs is stored, the ECU is regarded as a new one, and the internal ID code is stored therein. Write.
As a result, the internal ID codes can be matched at the time of replacement with new ones.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an immobilizer device capable of reliably rewriting an internal ID code.

[0008]

According to the present invention, a key ID code sent from a key is verified and an internal ID code is checked.
Immobilizer ECU that sends code to engine ECU
And an engine ECU that performs collation of the internal ID code received from the immobilizer ECU and controls engine start based on the collation result. The immobilizer device includes a predetermined manual operation when replacing the immobilizer ECU or the engine ECU. Switch means to be set to a state, and detecting that the switch means is in the predetermined state, and detecting the immobilizer ECU or engine E
Detecting means for detecting that the CU is being replaced, and the detecting means detects the immobilizer ECU or the engine EC.
Matching means for matching information on the internal ID codes held by both ECUs when it is detected that the U is to be replaced.

As described above, according to the present invention, when the aggressive condition that the switch means for manual operation is in a predetermined state is satisfied, it is determined that the immobilizer ECU or the engine ECU is to be replaced. Therefore, when it is not the time for replacement, it is determined that the time is for replacement, and the rewriting of the internal ID code is prevented, so that the internal ID code can be reliably rewritten. Therefore, the ignition switch is turned off during the rewriting of the internal ID code,
It is possible to prevent a problem that the internal ID codes of the two ECUs do not match and the engine cannot be started.

[0010]

Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings.

FIG. 1 is a diagram showing the overall configuration of an immobilizer device according to this embodiment. The key 10 has the shape of a normal key, but a transponder 12 is embedded in the base 10a. This transponder 1
2 includes a power supply circuit, a transmission / reception circuit, and a memory. Then, the power supply circuit receives a radio wave supplied from the outside with a coil, rectifies the radio wave, stores DC power in the capacitor, and operates the internal circuit. Note that a battery or the like may be incorporated. The transmission / reception circuit transmits / receives to / from the outside by radio waves. Further, an ID code (key ID code) unique to the key is stored in the memory.

The key 10 is inserted into a key cylinder 20. The key cylinder 20 is provided near the steering of the vehicle, and a driver operates the key cylinder 20 by inserting the key 10 into the key cylinder 20. The key cylinder 20 is the key 1
The rotation by 0 controls power on / off of various mounted devices, starting of the engine, and the like. An antenna coil 22 is provided on the key cylinder 20.
Is provided so as to surround the insertion portion of the key 10.
An immobilizer ECU 26 is connected to the antenna coil 22 via an amplifier 24. The immobilizer ECU 26 has an EEPROM 28, and stores the key ID code of the key 10 in the EEPROM 28. In addition, there are a plurality of keys for normal vehicles,
The OM 28 stores a plurality of key ID codes corresponding to the plurality of keys 10.

When the key 10 is inserted into the key cylinder 12 (normally, an insertion detection switch is provided in the key cylinder to detect insertion of the key), the immobilizer ECU 26 transmits the transponder 12 via the antenna coil 22 to the transponder 12. Power and communicate with the EEPRO
Key collation is performed to determine whether the key ID code stored in M28 is transmitted from the key 10 in use.

The immobilizer ECU 26 includes an engine E
The CU 30 is connected. This engine ECU 30
Performs fuel supply and ignition control to the engine, and also performs communication with the immobilizer ECU 26.
That is, when the immobilizer ECU 26 succeeds in key matching with the key 10, the immobilizer ECU 26 and the engine ECU 30 exchange predetermined codes.
If the exchange of this code is successful, the engine EC
U30 permits engine ignition and fuel injection. This allows the engine to be started.

Here, the exchange of codes between the immobilizer ECU 26 and the engine ECU 30 is based on the internal ID.
This is done using code. The exchange of this code is performed by the EEPROM 28 of the immobilizer ECU 26,
The same internal I is stored in the EEPROM 32 of the engine ECU 30.
It is assumed that the D code is stored. Therefore, when replacing a new ECU or ECU, both ECs
It is necessary to store the same internal ID code in the EEPROMs 28 and 32 of U.

A switch 40 for manual operation is connected to the engine ECU 30. The switch 40 is connected to the engine ECU 30 or the immobilizer ECU.
It is turned on manually when replacing 26. The condition that the switch 40 is turned on is one of the conditions.
Rewriting of the internal ID code in 28 and 32 is performed.

"Initial value of EEPROM"
No special data is written in the EPROMs 28 and 32. Therefore, the internal ID code stored in both EEPROMs 28 and 32 is "0000". Note that E
It is preferable to write the internal ID code in a plurality of places (for example, three places) in the EPROMs 28 and 32 and determine the internal ID code by majority decision.

[Initialization Command from Engine ECU] When a predetermined condition is satisfied, the engine ECU 30 transmits an initialization instruction to the immobilizer ECU 26. This initialization instruction is, for example, data “ABCD”. When the immobilizer ECU 26 receives the initialization command, the immobilizer ECU 26 checks the key ID code by communicating with the key 10. And
If this key verification is completed normally, the EEPROM
In the internal ID code at 28, “0000” is stored in three places. Further, “ABCD” is returned to engine ECU 30. If the key collation cannot be performed normally, no reply is returned.

When a response "ABCD" to the initialization command is received, the engine ECU 30
All the internal ID codes (three places) are “0000”.

Thus, when the predetermined conditions are satisfied, the immobilizer ECU 26 and the engine ECU 3
The internal ID code in the EEPROMs 28 and 32 of 0 is initialized. The engine ECU 30
In the case where the reply of "ABCD" is not received from the immobilizer ECU 26, it waits for about one second, transmits the same initialization command again, and waits for a reply. And 2
If a correct reply is not received even after the execution, the initialization process is stopped, and the abnormal data is stored in a predetermined location (for example, a diagnostic ECU that stores diagnostic information of various devices).

Here, the above-mentioned predetermined conditions are, for example, when three conditions of (i) ignition switch on, (ii) engine speed 0 rpm, and (iii) vehicle speed 0 km / h continue for 30 minutes, It is assumed that the switch 40 is on.

As described above, in this embodiment, the switch 4
0 is turned on, and if the switch 40 is not turned on, the EEPROM 28,
The initialization of the internal ID code at 32 is not performed. Therefore, if the switch 40 is not turned on by an aggressive operation, initialization can be prevented from being started even if other conditions happen to be satisfied. Therefore, it is possible to prevent the ignition key from being turned off during the initialization operation that has happened to be started, thereby preventing the initialization from being completed incompletely and making it impossible to start the engine.

The switch 40 is, as shown in FIG.
One terminal of the engine ECU 30 can be configured by a switch that connects to the ground by a manual switch. Thereby, initialization can be instructed by operating the switch 40 to set the terminal to the ground potential, and the engine ECU 30 can determine whether the condition is satisfied by detecting the potential of the terminal.

Further, the switch 40 may be a soft switch. For example, a switch 40 is provided in a diagnostic tool for diagnosing various in-vehicle devices,
The switch 40 may be turned on by a predetermined operation of the diagnostic tool. The diagnostic tool is preferably achieved as one application of a system having a display and a touch panel used for various applications such as navigation.

[Communication between Engine ECU and Immobilizer ECU] When the engine speed reaches 500 rpm or more, the engine ECU 30 generates a random number by using an internal random number generator and transmits the generated random number to the immobilizer ECU 26 as a first rolling code. . Immobilizer ECU26
Indicates that if the collation result of the key ID code is OK, the received first rolling code is stored in the EEPROM.
A conversion process is performed using the internal ID code stored in 28 and a second rolling code is returned. The engine ECU 30 checks whether the received second rolling code uses a correct internal ID code,
If confirmed, allow the engine to start.

Here, the engine ECU 30 determines whether its own E
When it is detected that the internal ID code stored in the EPROM 32 is the initial data “0000”, the generated random number IMMRAN is used as the internal ID code in the EEPROM.
The random number IMMRAN is transmitted to the immobilizer ECU 26 while being stored in the OM 32. The engine EC
If the random number IMMRAN generated in U30 happens to be the initialization code “ABCD”, it is changed to an appropriate value. The immobilizer ECU 26 determines that the transmitted data is not “ABCD” and the EEPRO
The internal ID code stored in M28 is "0000"
In the case of, the transmitted random number IMMRAN is stored as it is as an internal ID code.

Thus, the EEPROMs 32, 28
When the internal ID code stored therein is “0000”, the generated random numbers are stored in the two EEPROMs 32 and 28 as internal ID codes. by this,
When both EEPROMs 32 and 28 are new and when the above condition is satisfied and the initialization instruction is executed, two EEPROMs are used.
The same internal ID code is written in both EPROMs 32 and 28.

[0028]

As described above, according to the present invention,
When the positive condition that the switch is turned on is satisfied, the immobilizer ECU or the engine E
It is determined that it is time to replace the CU. Therefore, it is possible to prevent the internal ID code from being rewritten erroneously and to rewrite the internal ID code, and to reliably rewrite the internal ID code.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an overall configuration of an immobilizer device according to an embodiment.

[Explanation of symbols]

10 key, 12 transponder, 20 key cylinder, 22 antenna coil, 24 amplifier, 26 immobilizer ECU, 28, 32 EEPROM, 30 engine ECU, 40 switch.

Claims (1)

[Claims] 1. A key ID code transmitted from a key is collated, an immobilizer ECU that transmits an internal ID code to an engine ECU, and an internal ID code received from the immobilizer ECU are collated. An engine ECU that controls engine start based on the
An immobilizer device comprising: a switch means which is manually set to a predetermined state when the immobilizer ECU or the engine ECU is replaced; and detecting that the switch means is in the predetermined state, and the immobilizer ECU or the engine. Detecting means for detecting that the ECU is being replaced; and detecting the replacement of the immobilizer ECU or the engine ECU by the detecting means.
A matching means for matching information on the internal ID code of the immobilizer.