JP3475764B2 - 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 theft prevention device for preventing vehicle theft by comparing IDs.

[0002]

2. Description of the Related Art A transponder for transmitting an ID unique to a key is built in an ignition key, and the ID transmitted from this transponder and a pre-registered ID are compared and collated with each other. There is known a vehicle theft prevention device that prevents the vehicle from being stolen by permitting the engine to start only. On the other hand, there is known a technique that enables remote engine start using an engine start unit that receives an electric wave from a remote controller and sends an engine start command. Japanese Patent Laid-Open No. 8-15090
Japanese Patent Publication No. 2 discloses a vehicle equipped with both a vehicle theft prevention device and a remote control engine start unit.

[0003]

However, a vehicle anti-theft device that determines whether or not to start the engine according to the result of the ID verification of the key and an engine start unit that enables the engine to be started by remote control are provided in one vehicle. If both of them are provided at the same time, the antitheft effect of the vehicle may be reduced as a result of the conflicting functions of the two. In addition, there is a problem that trying to maintain the antitheft effect requires complicated work, especially when the engine start unit is to be retrofitted.

An object of the present invention is to provide a vehicle antitheft device capable of remotely starting the engine while maintaining the antitheft effect of the vehicle and easily retrofitting the engine start unit. is there.

[0005]

FIG. 1 showing an embodiment.
2 will be described in association with FIG. 2, the invention according to claim 1 is such that the control devices 5 and 6 that perform control for vehicle theft prevention according to the result of ID verification, and the ignition key 1.
A key ID sending device 1a that sends a unique key ID from the ignition key 1 to the control devices 5 and 6, and a predetermined unique starter ID in response to the transmission from the remote controller 4, 6, an engine start unit 3 for sending to the engine 6, and a storage device 5a for storing the key ID of the regular ignition key 1 and the starter ID of the regular engine start unit 3 as a registered key ID and a registered starter ID, respectively.
The engine start unit 3 is a remote controller 4
When you receive the first transmission from
The storage device 5a stores the selected ID in the starter I
It is stored as D, and after that, the engine start unit 3
Control device with the selected ID as a unique starter ID
When the received ID matches the registered key ID or registered starter ID stored in the storage device 5a , the control device 5, 6 sends the signal to the device 5, 6 to prevent the vehicle from being stolen. And the received ID is stored in the storage device 5a.
One of the stored registration key ID and registered starter ID
If they do not match , control is performed to prevent the vehicle from being stolen . The invention according to claim 2 is the vehicle antitheft device according to claim 1, wherein the engine start unit is
3 receives the first transmission from the remote controller 4.
The ID selected at this time is registered as a unique ID .

[0006]

Effects of the Invention According to the present invention, it is possible to enable engine start by remote control without sacrificing the anti-theft effect of the vehicle, also on retrofit engine start unit can be easily In addition, the work when retrofitting the engine start unit becomes extremely simple. According to the invention of claim 2, once selected and stored
The starter ID has been rewritten, or
The starter ID is not additionally stored.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a vehicle antitheft device according to the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes an ignition key which is inserted into an ignition key cylinder (not shown), and has a built-in transponder 1a for transmitting a key ID unique to the key to the immobilizer module 5.
Reference numeral 2 is an ignition switch that is turned on / off according to an operation of a key 1 inserted in an ignition key cylinder, and a switch 2 that switches the ignition on / off.
a and a switch 2b for connecting a power source to the starter motor M when turned on. When the ignition key 1 is inserted into the ignition key cylinder and rotated, the switch 2a is closed first, and then the switch 2b is closed.

In FIG. 1, reference numeral 3 denotes an engine start unit for starting an engine in response to remote operation. The engine start unit 3 is connected in parallel with a switch 2a and a relay switch 3a and a switch 2b. Relay switch 3b and receiving antenna 3
c and a memory 3d. The memory 3d stores the remote control ID of the regular remote controller 4 to be combined with the engine start unit 3. Further, the memory 3d is provided with an area for storing a starter ID sent to the immobilizer module 5 when the engine is started.

When the engine start unit 3 receives the radio wave transmitted from the remote controller 4 through the receiving antenna 3c, it demodulates the radio wave and recognizes the ID contained in the received signal, and this ID is stored in the memory 3d in advance. Collated with the remote control ID. Then, when the IDs of the both match, the relay switch 3a and the relay switch 3b are closed to rotate the starter motor M, and the memory 3
The starter ID stored in d is sent to the immobilizer module 5.

On the other hand, the engine start unit 3 has a function of creating a random number sequence, selecting it as a starter ID, and storing it in the memory 3d. Before the vehicle is mounted on the vehicle, the starter ID is not stored in the memory 3 of the engine start unit 3, and when the first radio wave from the remote controller 4 is received in this state, the starter ID is selected by itself. Is stored in the memory 3d. Then, the starter ID stored in the memory 3d is sent to the immobilizer module 5.

By receiving the first transmission from the remote controller 4, the starter ID is already stored in the memory 3d.
Is stored so that a new starter ID cannot be stored in the memory 3d, the starter ID once selected and stored cannot be rewritten, or a new starter ID cannot be additionally stored. Absent. In this case, when the second and subsequent transmissions from the remote controller 4 are received, the engine start unit 3 receives the memory 3d.
The starter ID stored in is read and sent to the immobilizer module 5.

The immobilizer module 5 shown in FIG. 1 stores a key ID (registration key ID) of a regular ignition key in advance, and further stores a starter ID (registered starter ID) of the regular engine start unit 3. A memory 5a having a region is provided.

Transponder 1 of ignition key 1
When the key ID is transmitted from a, the immobilizer module 5 receives and demodulates the radio wave, recognizes the key ID included in the received signal, and collates the key ID with the registered key ID in the memory 5a. Then, if the IDs of both match, the immobilizer module 5 sends an engine start permission signal to the engine control system 6.

When the immobilizer unit 5 receives the first starter ID from the engine start unit 3, the starter ID is stored in the memory 5a as a registered starter ID and the engine start permission signal is sent to the engine control system 6. Is sent.

When the second or subsequent starter ID is received from the engine start unit 3, the immobilizer unit 5 collates the received starter ID with the registered starter ID in the memory 5a. Then, if the IDs of both match, the immobilizer module 5 sends an engine start permission signal to the engine control system 6.

As a result of the above collation, ignition key 1
If the key ID transmitted from the engine start unit 3 does not match the registered key ID or the starter ID sent from the engine start unit 3 does not match the registered starter ID, the immobilizer module 5 starts the engine control system 6 to start the engine. Send a prohibition signal.

The engine control system 6 is connected to an engine (not shown) of the vehicle and controls each part of the engine. When the engine start permission signal or the engine start prohibition signal is input from the immobilizer module 5, the engine control system 6 performs control for starting the engine or stopping the engine, respectively.

As shown in FIG. 1, the engine start unit 3, the immobilizer module 5 and the engine control system 6 are connected to a power source indicated by "B" in FIG. Further, the immobilizer module 5 and the engine control system 6 are provided with an ignition wire extended from the switch 2a and the switch 3a, and the engine control system 6 is provided with a switch 2b.
And the starter wire extended from the switch 3b
Each is connected.

Next, the operation of the vehicle antitheft device of this embodiment will be described. FIG. 2 is a flowchart showing the operation of the immobilizer module 5. Step S5
The flag read by indicates whether or not the starter ID is stored in the memory 5a, and is set to ON when the starter ID is not stored. Since the starter ID is not stored in the memory 5a when the immobilizer module 5 is installed in the vehicle, the flag is on at the start of the operation.

In step S1 of FIG. 2, the voltage of the ignition line is read to determine whether the ignition is on or off. If it is determined that the ignition is on, the process proceeds to step S2. If it is determined that the ignition is off, step S1 is performed.
Repeat. The ignition is on when either the switch 2a or the switch 3a is closed, and the ignition is off when both the switch 2a and the switch 3a are open.

Next, in step S2, it is determined whether or not the key ID of the ignition key 1 is received, and the key ID is received.
If it is determined that the key ID has been received, the process proceeds to step S3. If it is determined that the key ID has not been received, the process proceeds to step S4. In step S3, the received key ID and memory 5
The registration key ID stored in a is collated, and step S
Proceed to 7. On the other hand, in step S4, it is determined whether or not the starter ID sent from the engine start unit 3 is received. If it is determined that the starter ID is received, the process proceeds to step S5, and it is determined that the starter ID is not received. If so, the process returns to step S2.

In step S5, the state of the flag is read, and if it is determined that the flag is off, step S6
If it is determined that the flag is on, the process proceeds to step S8. In step S6, the starter ID received in step S4 and the starter ID read from the memory 5a
After collating with (registered starter ID), the process proceeds to step S7. On the other hand, in step S8, the starter ID received in step S4 is stored in the memory 5a, and the process proceeds to step S9. In step S9, the flag is turned off, and in step S10
Go to.

If the key ID is collated in step S3, or if the starter ID is collated in step S6, the process proceeds to step S7 and step S7.
At 7, it is determined whether the IDs match as a result of the matching. If it is determined in step S7 that the IDs match, the process proceeds to step S10, and if it is determined that the IDs do not match, the process proceeds to step S11.

In step S10, an engine start permission signal is sent to the engine control system 6 to shift to a normal processing mode for starting the engine, and the process returns. On the other hand, in step S11, an engine start prohibition signal is sent to the engine control system 6 to shift to engine stop processing and return.

Next, the actual operation when the engine start unit 3 is retrofitted will be described with reference to the flowchart of FIG. Before the engine start unit 3 is attached, the engine start is permitted only when the IDs match in the key ID collation in step S3 (steps S7 and S10).

After connecting the necessary harnesses and installing the engine start unit 3, when the proper remote controller 4 to be combined with the engine start unit 3 is operated, the engine start unit 3 itself selects the starter ID and The starter ID is stored in the memory 3d and sent to the immobilizer module 5. Further, at this time, since the switch 3a is closed, the ignition is turned on, and the sequence of the immobilizer module proceeds from step S1 to step S2 in FIG. 2, and the reception of the starter ID affirms the determination in step S4, and thus proceeds to step S5.

Since the immobilizer module 5 has received the starter ID for the first time, the flag remains on and the determination in step S5 is affirmed. Therefore, the process proceeds from step S5 to step S8 to starter
D (registered starter ID) is stored in the memory 5a, and the flag is turned off in the subsequent step S9. Further, the process proceeds to step S10 and the engine is started.

When the remote controller 4 starts the engine for the second time and thereafter, the engine start unit 3 reads the starter ID from the memory 3d and sends it to the immobilizer module 5. At this time, since the flag has already been turned off, the determination in step S5 is denied and the process proceeds to step S6, in which the starter ID is verified. Since the same engine starter ID as the previous starter ID is sent from the regular engine start unit 3, the starter ID sent from the engine start unit 3 is stored in the memory 5
It matches the registered starter ID stored in a. Therefore, when the regular engine start unit 3 is used, as a result of the starter ID collation in step S6, the determination in step S7 is affirmative, and step S10 is performed.
At, the engine is started.

As described above, in the present embodiment, the first engine start using the remote controller 4
The engine start unit 3 selects the starter ID, and the starter ID is stored in the memory 5a as the registered starter ID. When starting the engine for the second time and thereafter using the remote controller 4, the engine is started after confirming that the starter ID sent from the engine start unit 3 matches the registered starter ID.

In this embodiment, the remote controller 4
Since the starter ID is automatically selected and registered by starting the engine for the first time, no complicated operation is required when the engine start unit 3 is retrofitted. For example, when mounting the engine start unit 3, it is not necessary to store the ID unique to the engine start unit 3 in the immobilizer module or the memory of the engine control system.

Further, since the starter ID is collated at the time of starting the engine for the second time and thereafter by the remote controller and the starter ID cannot be newly registered, the remote control can be performed without sacrificing the vehicle antitheft effect. The engine can be started by operation. For example, when a new engine start unit 3 is attached by an illegal means, the original starter ID is already stored in the memory 5a, so the starter ID sent from the new engine start unit 3 is accepted. Instead, the process proceeds to the engine stop process (step S11). Therefore, even if the new engine start unit 3 is attached, the engine cannot be started. In addition, it is impossible to illegally start the engine by changing the wiring.

Further, in the present embodiment, since the communication of the starter ID for collating at the time of starting the engine is performed through the wiring inside the vehicle without using radio waves,
For example, it becomes extremely difficult to read the starter ID using a receiving device or the like. Therefore, a high antitheft effect can be exhibited.

As an operation for preventing the theft of the vehicle, in the present embodiment, the engine start is prohibited. However, instead of prohibiting the engine start, the vehicle is prohibited from traveling or the theft is prevented. Various other operations can be adopted, such as issuing a warning.

[Brief description of drawings]

FIG. 1 is a connection diagram showing a configuration of a vehicle theft prevention device of the present embodiment.

FIG. 2 is a flowchart showing the operation of the immobilizer module of the vehicle antitheft device of the present embodiment.

[Explanation of symbols]

1 ignition key 1a transponder 3 engine start unit 4 Remote controller 5 Immobilizer module 5a memory 6 Engine control system

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI F02D 45/00 370 F02D 45/00 370Z F02N 15/00 F02N 15/00 F H04Q 9/00 301 H04Q 9/00 301B (56) References JP 10-81201 (JP, A) JP 10-35416 (JP, A) JP 8-150902 (JP, A) JP 9-119246 (JP, A) JP 9 -109833 (JP, A) JP-A-8-108825 (JP, A) JP-A-9-14109 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60R 25/04 F02D 43/00 F02D 45/00 F02N 15/00 H04Q 9/00

Claims (2)

(57) [Claims] 1. A control device for performing control for preventing vehicle theft according to a result of ID collation, and a key ID sending device for sending a key ID unique to an ignition key from the ignition key to the control device. And an engine start unit that sends out a predetermined unique starter ID to the control device in response to the transmission from the remote controller, and a key ID of the regular ignition key and a starter ID of the regular engine start unit. A storage device for storing a registration key ID and a registration starter ID, respectively, wherein the engine start unit is the remote controller.
If you select the ID by yourself when you receive the first transmission from
Both the storage device stores the selected ID in the registration
It is stored as a tarta ID, and the engine starts after that.
The unit assigns the selected ID to the unique starter I
When the received ID matches the registration key ID or the registration starter ID stored in the storage device, the control device transmits the D to the control device to prevent the vehicle from being stolen. The received ID is stored in the storage device without any control.
Both the recording key ID and the registered starter ID
A vehicle theft prevention device characterized by performing control for preventing vehicle theft if not done. 2. The engine start unit is the
Select when the first transmission from the mote controller is received.
The vehicle antitheft device according to claim 1, wherein the determined ID is registered as the unique ID .