JPH08282443A - Engine start control device - Google Patents

Abstract

PURPOSE: To improve the reliability in terms of theft prevention by returning to an ID code, turning the engine can be started according to the result from referencing, and rewriting the ID code different from the present one. CONSTITUTION: When an engine key 10 is inserted through a key cylinder 14, a CPU 28 for a signal receiver 20 reads the first ID code written in an IC 12 and refer to a reference ID code stored in an EEPROM 22. When the two are identical, the contact of a starter cut relay 16 is closed. Then another CPU 34 reads the second ID code stored in the EEPROM 22 and refer to a reference ID code stored in EEPROM 32, and if the two are identical, the start of the engine is permitted. After the engine is stared, the first and second ID codes are rewritten into other ID codes in the CPU 28, 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine start control device incorporated in an antitheft device for preventing theft of a vehicle, and more particularly, to start the engine by collating an ID code stored in an engine key. The present invention relates to an enabling engine start control device.

[0002]

2. Description of the Related Art Conventionally, an antitheft device for a vehicle is one which is designed to give an alarm by detecting a vibration applied to the vehicle and prevent theft, or to start the engine only by a desired engine key. Some of them are made possible or some of them are used together.

In the case where the engine can be started only when the engine key is a desired key, it is usually judged by checking the ID code whether or not the engine should be started.

Specifically, the engine key has a fixed ID in advance.
The code is stored, read by the reading device provided in the key cylinder, collated, and if the ID codes match, it is possible to operate the computer that controls the engine start etc. Is to start the engine.

[0005]

However, in such a conventional engine start control device using a fixed ID code, even if it takes a long time, the engine key ID
If the code can be deciphered, there is a problem that the engine can be started, and there is room for improvement in the reliability of the anti-theft device.

The present invention has been made for the purpose of further improving the reliability of such a conventional device, and an object thereof is to provide an engine start control device having a high antitheft property.

[0007]

The present invention for achieving the above object has the following constitution.

According to the first aspect of the present invention, the readable / writable first storage means built in the engine key for storing the first ID code for starting the engine and the first storage means are accessed. A first ID code reading means for reading the first ID code, and a first collating means for collating the first ID code read by the first ID code reading means with an ID code for collation updated and stored. And as a result of the matching by the first matching means, when the first ID code matches the ID code for matching, an engine start permission signal output means for outputting a first stage engine start permission signal, A readable / writable second storage means for storing a second ID code for starting the engine, and a second storage means for receiving the engine start permission signal from the engine start permission signal output means. A second ID code reading unit that accesses and reads the second ID code, and a second ID code reading unit that matches the second ID code read by the second ID code reading unit with an ID code for verification that is updated and stored. As a result of the matching by the matching means and the second matching means, if the second ID code matches the ID code for matching,
An engine start permitting means for outputting a second stage engine start permitting signal, a first ID code stored in the first storing means, and an ID code for collation stored in the first collating means. A first ID code rewriting unit that rewrites the same ID code different from the current one, and a second ID code stored in the second storage unit and a collation unit stored in the second collation unit. The present invention is characterized by having a second ID code rewriting means for rewriting the ID code and the same ID code different from the current one.

According to the second aspect of the present invention, there is further provided engine start recognition means for recognizing the start of the engine, and the first ID code rewriting means recognizes the start of the engine by the engine start recognition means. If
The first ID code stored in the first storage means and the ID code for verification updated and stored in the first verification means are rewritten to the same ID code different from the current one. And

According to another aspect of the invention, the second ID code rewriting means stores the second ID code stored in the second storage means when the engine is turned off by the engine key. And the ID code for verification updated and stored in the second verification means are rewritten to the same ID code different from the current one.

[0011]

The engine start control device of the present invention constructed as described above operates as follows.

According to the first aspect of the present invention, the first ID code for engine activation read by the first ID code reading means is collated with the ID code for collation stored in the first collating means. The engine start permission signal output means is
When the first ID code matches the ID code for collation, the engine start permission signal of the first stage is output.

When the engine start permission signal is output from the engine start permission signal output means, the second I for engine start read by the second ID code reading means is then read.
ID for verification in which the D code is stored in the second verification means
Matched with the code. The engine start permission signal output means outputs a second stage engine start permission signal that enables engine activation when the second ID code matches the ID code for collation, and sets the engine in a ready state. .

The first ID code rewriting means separates the first ID code stored in the first storage means and the ID code for verification updated and stored in the first verification means from the current one. Rewrite with the same ID code.

Further, the second ID code rewriting means regards the second ID code stored in the second storage means and the ID code for verification updated and stored in the second verification means as the current one. Rewrite with another same ID code.

According to the second aspect of the present invention, the first ID code rewriting means includes the first ID code and the first ID code stored in the first storage means when the engine start is recognized by the engine start recognition means. The ID code for verification updated and stored in the verification means is rewritten to the same ID code different from the current one.

In the invention according to claim 3, the second ID code rewriting means stores the second ID stored in the second storage means when the engine is turned off by the engine key.
I for the code and the collation updated and stored in the second collating means
Replace the D code with the same ID code different from the current one.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of an engine start control device according to the present invention.

The engine key 10 has a built-in IC 12 as a first storage means for storing a first ID code for starting the engine. The IC 12 is a readable / writable memory, and is of a type that receives energy from an external magnetic field to read / write.

The key cylinder 14 into which the engine key 10 is inserted has a first ID code reading means and a first ID.
This IC functions as a code rewriting means.
The ID code stored in 12 is read and output to a receiver 20 described later via a data-out line. On the contrary, the new ID code sent from the receiver 20 is also stored in the IC 12 via the data-in line. In this sense, it is also the first ID code rewriting means.

The receiver 20 functions as a first verification means, and stores a second ID code and a second ID code for verification that are the same as the operation program and the first ID code of the receiver 20. EEPRO which is a memory means
M22, a starter cut relay 26 as an engine start permission signal output means for preventing the starter motor 25 from rotating regardless of the engine key 10, and an engine start permission signal output means operated by a program of the EEPPOM22. Second ID code reading means,
It has a first ID code rewriting means, a second ID code rewriting means, and a receiver CPU 28 that also functions as engine start recognition means.

The receiver CPU 28 has a function of recognizing the start of the engine by inputting a voltage signal from an alternator (not shown), and the first ID code sent from the key cylinder 14 is stored in the EEPROM 22 for verification. If it does not match, the contact of the starter cut relay 26 is opened and the starter motor 2 is checked.
It has a function of forcibly blocking the rotation of No. 5.

Further, the receiver CPU 28 has an E which will be described later.
It also functions as a first ID code rewriting means for writing a new ID code different from the current one into the IC 12 based on the signal from the CCS 30. This rewriting of the first ID code is performed when the start of the engine is confirmed by inputting the voltage signal from the alternator.

The ECCS 30 functions as a second collating means, and the injectors 1 to 8 for supplying gasoline into the engine and the IGN coil (ignition coil) for igniting gasoline are externally controlled objects. ) 1 to IGN coil 8 are connected, and these injectors and IGN coil are
This E calculated based on the input engine speed
It is activated by the signal from the CCS 30.

The EEPROM 32 is a memory that stores a second ID code for starting the engine.

The CPU 34 is a second ID code reading means,
C for the receiver, which functions as a second collation unit, an engine start permission unit, and a second ID code rewriting unit.
The second ID code sent from the PU 28 via the data outline is read and collated with the collation ID code stored in the EEPPOM 32. In the case of non-coincidence, the injectors 1-8 and the IGN coil 1-
No signal is output to 8. Therefore, the engine will not be started.

On the other hand, the CPU 34 outputs a signal to the injectors 1 to 8 and the IGN coils 1 to 8 in the case of collation matching, so that the engine can be started.

As shown in FIG. 2, the receiver 20 has a starter cut function, an ID code collation determination function, a rolling ID code creation function, a fail safe function, and a failure diagnosis function. The ECCS 30 has an injector. It has a signal cut function, an ignition signal cut function, an ID code storage function, a fail safe function, and a failure diagnosis function.
For reference, FIG. 4 shows the connection status (connected by four lines) between the receiver 20 and the ECCS 30 and the signal transfer status, and FIG. 5 shows a detailed circuit diagram of the receiver 20. .

The configuration of the device of the present invention is as described above.
The schematic operation of the device of the present invention will be described below with reference to FIGS.

When the engine key 10 is inserted into the key cylinder 14, the receiver CPU 18 reads the first ID code written in the IC 12, and the EEPR is read.
The ID code for collation stored in the OM 22 is collated. This ID code consists of a code within 48 bits as shown in FIG.

If both ID codes match as a result of the collation, the contact of the starter cut relay 16 is closed, and the starter motor 25 can be rotated by the engine key 12. On the other hand, if they do not match, the contact of the starter cut relay 16 is opened and the engine key 12
The starter motor 25 is prevented from rotating regardless of the operation. In other words, if they do not match, the starter motor 25
Does not rotate.

If the collations match, this time, the CPU 34 sends the EEPR via the receiver CPU 34.
The second ID code stored in the OM 22 is read and collated with the ID code for collation stored in the EEPROM 32. This ID code consists of a code within 24 bits as shown in FIG.

If both ID codes match as a result of the collation, the CPU 34 operates the injector and the ignition coil to rotate the engine, as shown in FIG. 3 (a). On the other hand, if this does not match,
As shown in FIG. 3B, the injector and the ignition coil are not operated. That is, in the case of a mismatch,
Even if the starter motor 25 rotates, the engine will not start. When the engine is started, the alternator rotates and the generated voltage rises.
The PU 28 recognizes this increase in voltage and performs a process of rewriting the first ID code to another ID code. This another I
The D code is created by a random number. When the engine is turned off by the engine key 10, the CPU 34
Performs the process of rewriting the second ID code to another ID code. This other ID code is created by a random number.

Next, processing performed between the IC 12 of the engine key 10 and the receiver 20 and the receiver 20 and the ECC.
The processing performed between S30 and S30 will be described in detail with reference to the flowcharts of FIGS.

FIG. 6 shows the processing performed by the receiver 20.

Sub-routine during stop of engine for receiver (S
1) is shown in detail in FIG. 8, the receiver engine operating subroutine (S2) is shown in FIGS. 9 and 10, and the receiver engine after-stop subroutine (S3) is shown in FIG. Details are shown.

FIG. 7 shows the processing performed by the ECCS 30.

The details of the ECCS engine stop subroutine (S10) are shown in FIGS.
The subroutine (S11) after the CS engine is stopped is shown in FIG.
For details.

When the engine is stopped, as shown in FIG. 8, when the ignition key 10 is inserted into the key cylinder 14 and the ignition is turned on while the engine is stopped, the ID code reception start signal sent from the ECCS 30 is read ( S21), the receiver CPU 28 uses the IC 12
The first ID code stored in is read (S22).
The receiver CPU 28 reads the verification ID code stored in the EEPROM 22 and determines whether the first ID code matches the verification ID code (S23). The collation result and the ID code transmission start signal are written in the ECCS 30 (S24). CPU2 for receiver
When a matching result obtained by 8 is obtained,
The verification OK signal and the second ID code stored in the EEPROM 22 are written in the ECCS 30. Further, the starter cut relay 26 is turned off to allow the starter motor 25 to rotate using the engine key 10 (S2).
5, S26). On the other hand, when the collation result indicating that they do not match is obtained, the collation NG signal and the second ID code stored in the EEPROM 22 are written in the ECCS 30 (S25, S27).

During the engine operation, as shown in FIG. 9, when the receiver CPU 28 detects the voltage increase of the alternator, the communication with the ECCS 30 is stopped, and the current first ID code is changed to a new ID code. To generate a new ID code (S30-).
S32). When it is determined that the engine is operating, the new ID code is updated to the IC 12 and the EEPROM 22 so that the ID code created by this random number generation can be used as the first ID code for the next time. It is stored (S33, S34). On the other hand, if the operation of the engine is not recognized, the ID code is not rewritten (S35). Next, the receiver CPU 28
The first ID code updated and stored in the IC 12 is read, and the ID for collation updated and stored in the EEPROM 22 is read.
Check that the ID code matches with the code (S
36, S37). As shown in FIG. 10, if the collation of both ID codes is OK, the process is terminated, and if the collation is NG, a failure display is performed (S38, S39).

Next, after the engine is stopped, as shown in FIG. 11, after the engine is stopped, the receiver CPU 2
8 reads the request signal of the new second ID code from the ECCS 30 (S40), and writes this new second ID code in the ECCS 30 (S41). Next, ECC
When a new ID code start signal for starting the collation of this new second ID code from S30 is read (S42), EC
The new second ID code sent from the CS 30 is read, the updated and stored second ID code is written in the EEPROM 22, and both ID codes are collated (S43, S4).
4). Then, the result of this collation is written and the process is terminated (S45).

While the engine is stopped, as shown in FIG.
The ECCS 30 waits until the ignition key 10 is inserted into the key cylinder 14 while the engine is stopped and the ignition is turned on (S50, S51).
An ID code reception start signal for starting the reading of the code is written in the receiver 20 (S52). The verification result of the ID code sent from the receiver 20 and the transmission start signal are read (S53), and the verification OK signal and the EEPROM are read.
The second ID code stored in 22 is read, or the verification NG signal and the second ID code stored in the EEPROM 22 are read (S54). Next, C
The PU 34 collates the collating ID code stored in the EEPROM 32 with the second ID code sent from the receiver 20 (S55).

When the CPU 34 obtains the matching result, the ignition coil and the injector are operated to start the engine (S56 to S5).
8). On the other hand, when the collation result indicating that they do not match is obtained, the ignition coil and the injector are not operated, and the engine start is blocked (S59, S60). After the engine is stopped, a signal requesting a new second ID code created by the receiver 20 is output by detecting the ignition off signal (S70, S71), and the signal is output from the receiver 20 according to this signal. New second ID
Enter the code and store it in the EEPROM 32 (S7
2). Next, a signal for starting confirmation of this new second ID code is output to the receiver 20 (S73), and the EEPR
The new ID code for verification stored in the OM 32 is output (S74), and the verification result of the new second ID code and the ID code for verification performed by the receiver 20 is read (S75). . If the verification of both ID codes is OK, the process is terminated, and if the verification is NG, a failure display is performed (S76, S77).

It should be noted that the above operation is graphically displayed collectively as shown in FIG.

[0046]

As described above, the present invention has the following effects for each claim.

According to the structure of claim 1, the two ID codes of the first ID code and the second ID code are collated,
While the engine can be started according to the result of the collation, after that, the first ID code and the second ID code are rewritten to different ID codes from the current one. The code is rewritten every time the engine is started, and the reliability in terms of theft prevention is significantly improved.

According to the second aspect of the invention, when the engine is started, the ID code is rewritten to an ID code different from the current one. Therefore, the ID code is changed every time the engine is started. As a result of being rewritten, the reliability in terms of theft prevention is significantly improved.

According to the structure of claim 3, when the engine is turned off by the engine key, the ID code is rewritten to an ID code different from the current one. Therefore, every time the engine key is pulled out. Since the ID code is rewritten, the reliability in terms of theft prevention is significantly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an engine start control device according to the present invention.

FIG. 2 is a diagram for explaining a signal exchange between the key, the receiver, and the ECCS shown in FIG. 1 and a description of each function thereof.

FIG. 3 is a diagram for explaining an engine start recognition.

FIG. 4 is a diagram for explaining a signal exchange between the receiver and the ECCS shown in FIG.

FIG. 5 is a diagram showing an example of a circuit configuration of a receiver of the engine start control device according to the present invention.

FIG. 6 is an operation flowchart of the device of the present invention.

FIG. 7 is an operation flowchart of the device of the present invention.

FIG. 8 is an operation flowchart of the device of the present invention.

FIG. 9 is an operation flowchart of the device of the present invention.

FIG. 10 is an operation flowchart of the device of the present invention.

FIG. 11 is an operation flowchart of the device of the present invention.

FIG. 12 is an operation flowchart of the device of the present invention.

FIG. 13 is an operation flowchart of the device of the present invention.

FIG. 14 is an operation flowchart of the device of the present invention.

FIG. 15 is a schematic view of the operation of the device of the present invention.

[Explanation of symbols]

 10 ... Ignition key, 12 ... IC, 14 ... Key cylinder, 20 ... Receiver, 22, 32 ... EEPROM, 25 ... Starter motor, 26 ... Starter cut relay, 28 ... Receiver CPU, 30 ... ECCS, 34 ... CPU .

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location G05B 15/02 7531-3H G05B 15/02 Z

Claims (3)

[Claims] 1. A first readable / writable first storage means (12) built in an engine key for storing a first ID code for starting an engine, and the first storage means (12) is accessed to access the first first storage means (12). Of I
First ID code reading means (14) for reading the D code
A first collating means (20) for collating the first ID code read by the first ID code reading means (14) with an ID code for collation updated and stored; and the first collating means (20). ), If the first ID code matches the ID code for verification, the engine start permission signal output means (26, 28) for outputting the engine start permission signal of the first stage, and the engine A readable / writable second storage means (22) for storing a second ID code for activation, and an second engine storage permission signal output from the second engine storage permission signal output means (28). Access to the second ID to read the second ID code
The code reading means (28, 34) and the verification I for updating and storing the second ID code read by the second ID code reading means (28, 34).
As a result of the collation by the second collating means (30) for collating with the D code and the second collating means (34), if the second ID code matches the ID code for collation, the second step An engine start permitting means (34) for outputting an engine start permitting signal, a first ID code stored in the first storing means (12) and a collating means stored in the first collating means (20). ID code rewriting means (14, 28) for rewriting the same ID code as the current one
And the second ID code stored in the second storage means (22) and the ID code for verification stored in the second verification means (30) are the same ID different from the current one. An engine start control device comprising: a second ID code rewriting means (28, 34) for rewriting a code. 2. The engine starting recognition means (28) for recognizing starting of the engine is further provided, and the first ID code rewriting means (14, 28) is configured to start the engine by the engine starting recognition means (28). When recognized, the first ID code stored in the first storage means (12) and the ID code for collation updated and stored in the first collation means (20) are the current ones. The engine start control device according to claim 1, wherein the engine start control device is rewritten to another same ID code. 3. The second ID code rewriting means (28, 3)
4) is updated and stored in the second ID code stored in the second storage means (22) and the second verification means (30) when the engine is turned off by the engine key (10). 2. The engine start control device according to claim 1, wherein the existing ID code for verification is rewritten to the same ID code different from the current one.