JP2002295079A - Door unlocking device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a door unlocking device for a vehicle with improved theft resistance in a vehicle whose door is locked or unlocked by operating a wireless key. SOLUTION: When it is determined that a code C is received from an immobilizer ECU 5 (S204; YES), the code C is converted to a code C2 by a computing expression D stored in a door lock ECU 7 (S206). Subsequently, the code C1 transmitted from the immobilizer ECU 5 and the code C2 calculated in the door ECU are checked with each other (S210). When a match is determined as a result of checking (S210: YES), a door lock-unlock motor 6 is operated (S212), to unlock the door. When no match is determined (S210: NO), unlocking of the door is inhibited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides code communication between an electromagnetically coupled transponder (automatic transponder) or the like mounted on a key and a vehicle, provided that the code returned is proper. The present invention relates to a vehicle door unlocking device capable of unlocking a door.

[0002]

2. Description of the Related Art Conventionally, in a vehicle in which the door of a vehicle can be locked or unlocked by operating a wireless key, the door can be locked or unlocked even when the battery of the wireless key runs out or when the battery of the vehicle rises. To enable unlocking, a so-called mechanical door key cylinder was provided.

[0003]

However, the door key cylinder of such a mechanical mechanism can insert and release the key as long as the groove formed in the metal part and the groove of the key to be inserted coincide with each other. Since the door can be unlocked by operating the lock, the vehicle was stolen by a so-called forged key that forged a groove cut in the metal part of the door key cylinder, and there was a problem with theft resistance. .

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle door unlocking device capable of improving the anti-theft property of a vehicle door.

[0005]

According to the first aspect of the present invention, a transponder incorporated in a key is brought to a predetermined position on a door outside a vehicle. Then, a predetermined code is transmitted to the vehicle side, and as a result of comparing the transmitted code with the predetermined code stored in the vehicle, if both codes match, the door of the vehicle is unlocked.

According to the present invention, for example, in a vehicle in which the door can be locked or unlocked by operating the wireless key, the door can be unlocked even when the battery of the wireless key runs out, as in the conventional case. Locking becomes possible.

Further, since it is not necessary to provide a key cylinder of a so-called mechanical mechanism in a vehicle as in the prior art, theft of the vehicle due to forgery of a key can be prevented, and the antitheft property of the vehicle can be improved.

According to a second aspect of the present invention, a key insertion slot is provided at a predetermined position of a door outside the vehicle, and when a key is inserted into the key insertion slot, a code is transmitted to the vehicle. Alternatively, the code may be collated on the vehicle side.

As a result, it is possible to reliably perform code collation, and it is possible to increase the reliability of unlocking the door.

Further, as in the invention according to claim 3,
When the key touches a predetermined position on the door outside the vehicle,
The code may be transmitted to the vehicle.

That is, the transponder can transmit the code to the vehicle side without the power supply by the action of the magnetic field emitted from the vehicle side, so that the transponder strongly applies the magnetic field at a predetermined position of the door. If you leave
The code can be transmitted simply by touching a predetermined position on the door.

As a result, the code can be collated with a simple configuration, and the anti-theft property of the vehicle can be improved.

Further, according to the invention described in claim 4, the vehicle has an auxiliary battery.
A power supply for unlocking a vehicle door may be supplied.

With this configuration, even when the battery of the vehicle has run out, power can be supplied by the auxiliary battery, so that the door can be reliably unlocked.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the overall configuration of a vehicle door unlocking device according to this embodiment.

The wireless key 1 has a button for locking and unlocking the door, and by operating the button, transmits a wireless key signal corresponding to the operation. Also,
The transponder 3 built into the wireless key 1 has the code A
1 is transmitted, and a code A1 is transmitted to the immobilizer ECU 5 when a predetermined operation described later is performed. The wireless tuner (receiver) 2 receives a wireless key signal from the wireless key 1.

The immobilizer ECU 5 energizes the antenna coil 4 to generate a magnetic field in the antenna coil 4. Due to this magnetic field, the antenna coil 4 is installed outside the vehicle.
When the above-described wireless key 1 is inserted into a key insertion slot (not shown) around which is wound, an induced current flows through the transponder 3 by electromagnetic induction, and the code A1 is transmitted from the transponder 3.

The immobilizer ECU 5 stores the code A2, and stores the code A2 transmitted from the transponder 3.
Check with 1. Then, when the result of the collation matches, the code C is transmitted to the door lock ECU 7 (details will be described later).

Upon receiving the wireless key signal from the wireless tuner 2, the door lock ECU 7 drives the door lock / unlock motor 6 to lock or unlock the door. Further, when the code C is transmitted from the immobilizer ECU 5, the code is collated, and when they match, the door lock / unlock motor 6 is driven to lock or unlock the door (details will be described later). . Further, the door lock ECU 7 has a function of performing security such as issuing an alarm when it is determined that an act of forcibly opening the door is performed based on a signal from a sensor (not shown). .

When the battery mounted on the vehicle goes up, the auxiliary battery 8 is turned on by the immobilizer ECU 5 and the door lock E.
This is for turning on the power to the CU 7. When the immobilizer ECU 5 and the door lock ECU 7 are powered on by the auxiliary battery 8, the door lock / unlock motor 6 can be driven.

Next, an operation for unlocking the door after the user performs the locking operation with the wireless key 1 will be described with reference to FIGS.

FIG. 2 is a flowchart showing a control process of the immobilizer ECU 3.

First, it is determined whether or not the transponder built-in key is inserted into the key insertion slot while the door is locked (S).
100). If it is determined that it has not been inserted (S
100: NO), the same determination is repeatedly performed until it is inserted.

If it is determined that the antenna coil has been inserted (S100: YES), power is supplied to the antenna coil 4 (S101). When the antenna coil 4 is energized, the transponder 3 is actuated by the action of the magnetic field as described above.
Transmits the code A1, the code A1 is received (S102), and collation with the code A2 stored in the immobilizer ECU 5 is performed (S104). When it is determined that the code A1 and the code A2 match (S1
04: YES), the door lock ECU 7 is provided with an immobilizer ECU.
5 is transmitted (S10).
6).

Then, the code C is converted into the code C1 by the formula D (S108), and the code C1 is transmitted to the door lock ECU 7 (S110).

On the other hand, if it is determined that the code A1 does not match the code A2 (S104: NO), unlocking of the door is prohibited.

Next, control processing executed by the door lock ECU 7 will be described with reference to FIG.

The door lock ECU 7 first determines whether a wireless key signal has been received from the wireless tuner 2 (S200). Then, if it is determined that it has been received (S200: YES), the door lock / unlock motor 6 is driven to unlock the door (S20).
2).

On the other hand, if it is determined that the wireless key signal has not been received (S200: NO),
It is determined whether code C has been received from U5 (S2).
04). If it is determined that the code C has not been received (S204: NO), the process returns to step S200 and the same determination is made.

If it is determined that the code C has been received from the immobilizer ECU 5 (S204: YES), the code C is stored in the door lock ECU 7 using the calculation formula D
Is converted into the code C2 (S206).

Then, it is determined whether or not the code C1 has been received from the immobilizer ECU 5 (S208), and if it is determined that the code C1 has been received (S208: YES), the immobilizer ECU 5 is determined.
5 is compared with the code C2 calculated in the door lock ECU 7 (S210).

If it is determined that they match (S210: YES), the door lock / unlock motor 6 is operated (S212) to unlock the door. If it is determined that they do not match (S21
0: NO), prohibiting door unlocking.

In the present embodiment, the code is collated between the immobilizer ECU 5 and the door lock ECU 7, but this collation is omitted, and the transponder 3 and the immobilizer ECU 5 are collated.
The code may be collated only with the CU 5 and the door may be unlocked if the codes match.

Here, the above-mentioned door can be unlocked even when the battery of the vehicle has run out. That is, the immobilizer ECU 5 and the door lock ECU 7 operate the auxiliary battery 8.
Is supplied between the transponder 3 and the immobilizer ECU 5 and between the immobilizer ECU 5 and the door lock EC.
The code is collated with U7, and if they match, the door lock ECU 7 drives the door lock / unlock motor 6 to unlock the door. In addition, power is supplied only to the immobilizer ECU 5 so that the transponder 3 and the immobilizer ECU 5 are supplied with power.
5 and the door lock / unlock motor 6 may be directly driven by the immobilizer ECU 5 when the codes match.

As described above, according to the present embodiment, when the transponder 3 built in the wireless key 1 is inserted into the key insertion slot, the code A1 is transmitted by the electromagnetic force from the vehicle side, and The collation result with the code A2 stored in the ECU 5 matches, and further, the code C1 transmitted from the immobilizer ECU 5 and the door lock ECU
When the result of the comparison with the code C2 in 7 matches, the door of the vehicle is unlocked.

As a result, in a vehicle in which the door can be locked or unlocked by operating the wireless key, the door can be unlocked even when the battery of the wireless key runs out, as in the conventional case. .

Further, since there is no need to provide a key cylinder of a so-called mechanical mechanism in the vehicle as in the conventional case, theft of the vehicle due to forgery of the key can be eliminated, and the antitheft of the vehicle can be improved.

Further, by equipping the vehicle with the auxiliary battery 8, power can be supplied by the auxiliary battery even when the battery of the vehicle runs out, so that the door can be unlocked reliably. .

It should be noted that the immobilizer ECU 5 as in the present embodiment is used.
May be used as an immobilization ECU for starting the engine. Further, the transponder 3 built in the wireless key 1 may be used as a transponder for starting the engine.

Further, in the present embodiment, the case where the code A1 is transmitted when the wireless key 1 is inserted into the key insertion slot has been described. However, the present invention is not limited to this. The code A1 may be transmitted from the transponder 3 to the vehicle side by the action of the magnetic field generated from the vehicle side by contacting the predetermined position of the door.

When the wireless key 1 is brought close to a predetermined position outside the vehicle, the code A1 may be transmitted. In other words, the immobilizer ECU 5 intermittently energizes the antenna coil 4 and causes the magnetic field of the antenna coil 4 to act strongly, so that when the wireless key 1 is brought to a predetermined position of the door, the magnetic field from the vehicle side is reduced. , The code A1 may be transmitted from the transponder 3.

As a result, the code can be collated with a simple configuration, and the anti-theft property of the vehicle can be improved.

In this embodiment, the wireless key 1 enables the door to be locked or unlocked by operating a button.
However, the transponder 3 may be provided alone in the key.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a vehicle door unlocking device of the present embodiment.

FIG. 2 is a flowchart showing a control process executed by an immobilizer ECU 5;

FIG. 3 is a flowchart showing a control process executed by a door lock ECU 7;

[Explanation of symbols]

 Reference Signs List 1 wireless key 2 wireless tuner 3 transponder 4 antenna coil 5 immobilizer ECU 6 door lock / unlock motor 7 door lock ECU 8 auxiliary battery

Continued on front page F term (reference) 2E250 AA21 BB08 BB66 DD06 EE02 FF26 FF35 HH01 JJ03 KK03 LL01 RR11 SS03 TT03

Claims (4)

[Claims] In a vehicle door unlocking device, when a transponder built in a key is brought to a predetermined position on a door outside the vehicle, a predetermined code is transmitted from the transponder to a vehicle side, A vehicle door unlocking device for unlocking a door of a vehicle when a predetermined code and a predetermined code stored in a vehicle are collated and the two codes match with each other. 2. The vehicle door unlocking device according to claim 1, wherein a key insertion slot is provided at a predetermined position of the door outside the vehicle, and when the key is inserted into the key insertion slot, A vehicle door unlocking device for transmitting the code to a vehicle. 3. The vehicle door unlocking device according to claim 1, wherein the code is transmitted to a vehicle side when the key is touched at a predetermined position of a door outside the vehicle. Door unlocking device. 4. The vehicle door unlocking device according to claim 1, wherein the vehicle has an auxiliary battery, and the auxiliary battery supplies a power supply for unlocking a door of the vehicle. A vehicle door unlocking device characterized in that it can be supplied.