JPH08282444A - Engine start control device - Google Patents

Abstract

PURPOSE: To improve the reliability in terms of theft prevention by referring to an ID code, turning the engine can be started according to the result from referencing, and rewriting the ID code into other ID code different from the present one. CONSTITUTION: When an engine key 10 is inserted into a key cylinder 14, a signal receiver 20 reads an ID code entered in an IC 12, and a CPU 34 compares a reference ID code stored in an EEPROM 32 with the ID code from the receiver 20. When the two ID codes are identical, the injector and ignition coil of the engine are operated. If the two ID codes are not identical, the engine is hindered from starting. When the engine is started, the CPU 34 rewrites the ID code of the IC 12 installed in the engine key 10 and the reference ID code stored in the EPPROM 32 into other ID codes.

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.

In the present invention, the engine starting ID
A readable / writable storage means built in the engine key for storing the code, an ID code reading means for accessing the storage means when the ignition is turned on by the engine key, and reading the ID code, and the I
Collating means for collating the ID code read by the D code reading means with the ID code for collation updated and stored)
And, as a result of the matching by the matching means, if the ID code matches the ID code for matching, an engine start signal output means for outputting an engine start signal, and an engine start recognition means for recognizing the start of the engine. The ID code stored in the storage unit and the ID code for collation stored in the collating unit when the engine activation is recognized by the engine activation recognizing unit are different from the current ones. And an ID code rewriting means for rewriting to the ID code.

[0009]

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

When the ignition is turned on by the engine key, the ID code reading means reads the ID code stored in the storage means. The read ID code is collated with the collating ID code by the collating means.

In this collation, if the ID code matches the collating ID code, the engine start signal output means outputs an engine start signal.

Next, when the engine start recognition means recognizes the start of the engine, the ID code rewriting means
The ID code stored in the storage means and the ID code for verification stored in the verification means are rewritten to the same ID code different from the current one.

[0013]

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 an engine starting ID.
An IC 12 as a storage means for storing the code is built in. The IC 12 is a readable / writable memory and is of a type that receives energy from the outside to read / write.

The key cylinder 14 into which the engine key 10 is inserted functions as an ID code reading means and an ID code rewriting means, and reads the ID code stored in the IC 12 to receive the receiver 20 which will be described later.
Is output to On the contrary, the new ID code sent from the receiver 20 is also stored in the IC 12. In this sense, it is also an ID code rewriting means.

The receiver 20 functions as an ID code reading means and an ID code rewriting means, and is an IC.
The ID code stored in 12 is read and output to the ECCS 30 described later via the data outline,
The new ID code sent from the ECCS 30 via the data inline is stored in the IC 12.

The ECCS 30 is an external control target.
An injector 1 to an injector 8 for supplying gasoline into the engine and an IGN coil (ignition coil) 1 to IGN coil 8 for igniting gasoline are connected to these injectors and IG.
The N coil is operated by a signal from the ECCS 30 calculated based on the input engine speed.

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

The CPU 34 functions as a collating means, an engine starting signal outputting means, an engine starting recognizing means, and an ID code rewriting means, and reads the ID code sent from the receiver 20 through the data outline. ID for collation stored in EEPPOM32
When it is collated with the code and no collation is found, no signal is output to the injectors 1-8 and the IGN coils 1-8. 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 transmission / reception function and a failure diagnosis function.
30 has a rolling ID code creation function, an injector signal cut function, an ignition signal cut function, an ID code storage function, a fail safe function, and a failure diagnosis function.

By controlling the operation of this apparatus by one CPU 34 provided in the ECCS 30 as in the above-mentioned configuration, the cost can be reduced as compared with the type in which the receiver 20 also has a CPU. That is, it is possible to reliably prevent malfunction due to radio interference caused by wiring between the CPUs.

The structure of the device of the present invention is as described above.
The general operation of the device of the present invention will be described below.

When the engine key 10 is inserted into the key cylinder 14, the receiver 20 reads the ID code written in the IC 12 and sends it to the CPU 32 via the data outline. The CPU 34 is the EEPROM 32
ID code for verification stored in the receiver and this receiver 20
Collate with the ID code from.

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. on the other hand,
If they do not match, the injector and ignition coil are not activated. In other words, if they do not match, the engine will not start even if the starter motor rotates.

When the engine is started, the CPU 34
A process of rewriting the ID code of the IC 12 built in the engine key 10 and the ID code for verification stored in the EEPROM 32 into different ID codes is performed. 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 process performed between S30 and S30 will be described in detail with reference to the flowcharts of FIGS.

The engine stop subroutine (S1) shown in FIG. 3 is shown in detail in FIG. 4, and the engine operation subroutine (S2) is shown in FIG. 5 and FIG. 6 in detail.

FIG. 4 shows the processing performed by the IC 12, the receiver 20 and the ECCS 30 while the engine is stopped.

Ignition key 1 while the engine is stopped
When 0 is inserted into the key cylinder 14 and the ignition is turned on (S10), the CPU 34 causes 125 KHz.
The clock signal of is output to the receiver 20 and the IC 12 (S11, S12). The receiver 20 reads the ID code stored in the IC 12 according to this clock signal and outputs it to the CPU 34 of the ECCS 30 (S13).

The CPU 34 collates the read IDO code with the collating ID code stored in the EEPROM 32, and stops the output of the clock signal (S1).
4, S15).

When the CPU 34 obtains a matching result, the ignition coil and the injector are actuated to start the engine (S16 to S1).
8). On the other hand, when the verification result that they do not match is obtained, the ignition coil and the injector are not operated, and the start of the engine is blocked (S19, S20). 5 and 6 show a new ID code creating process performed after the engine operation is detected.

When the CPU 34 confirms that the engine has started (S21), the CPU 34 outputs a 125 KHz clock signal to the receiver 20 and the IC 12 (S22, S23). The CPU 34 reads the ID code from the IC 12 via the receiver 20 and creates a new ID code (S24, S25).

The CPU 34 updates and stores the created new ID code in the EEPROM 32 as an ID code for the next collation, sends the ID code to the receiver 20, and causes the IC 12 to update and store it as a new ID code. (S26, S27).

Then, the updated and stored new ID code is read through the receiver 20, and the updated and stored new ID code for collation is collated to stop the output of the clock signal (S28). , S29).

If the verification of both ID codes is OK,
When the process is completed and the collation is NG, NG display is performed (S30, S31).

The above operation is summarized and graphically displayed as shown in FIG.

[0039]

As described above, according to the constitution of the present invention,
While the ID code is collated and the engine can be started according to the result of the collation, the ID code is then rewritten to an ID code different from the current one, so that the engine is started with the ID code. It is rewritten every time, and 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 an operation flowchart of the device of the present invention.

FIG. 4 is an operation flowchart of the device of the present invention.

FIG. 5 is an operation flowchart of the device of the present invention.

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

FIG. 7 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, 30 ... ECCS, 32 ... EEPROM, 34 ... CPU.

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

Claims (1)

[Claims] 1. A readable / writable storage means (12) built in an engine key (10) for storing an ID code for starting an engine, and the storage means when the ignition is turned on by the engine key (10). An ID code reading means (14, 2) that accesses (12) and reads the ID code.
0), collating means (34) for collating the ID code read by the ID code reading means (14, 20) with the ID code for collation updated and stored, and the result of collation by the collating means (34). If the ID code matches the ID code for collation, an engine start signal output means (34) for outputting an engine start signal
And engine start recognition means (3
4) and the ID code stored in the storage means (12) when the engine startup is recognized by the engine startup recognition means (34) and the verification code stored in the verification means (34). ID code rewriting means (14, 2) for rewriting the ID code and the same ID code different from the current one.
0, 34) and an engine start control device.