JPH0555339B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an anti-theft device for equipment, and in particular, a receiver receives a code signal transmitted from a transmitter, and uses the result of code verification to identify a specific equipment. The present invention relates to an anti-theft device that enables operation of the anti-theft device.

<Prior Art> Conventionally, in order to prevent the theft of specific equipment, such as in-vehicle equipment or the vehicle itself, an anti-theft device comprising a transmitter carried by a driver and a receiver on the vehicle has been proposed. However, in such devices, the power supply, particularly in the transmitter, may run out relatively quickly and become inoperable.

Therefore, Japanese Patent Application Laid-open No. 1659/1983 discloses a structure in which a part of the portable device is in the shape of a mechanical key, and the portable device is charged by inserting the key into the ignition key switch of the vehicle. Disclosed. However, if signals are continuously exchanged between the transmitter and the receiver while the transmitter side power source is being charged, the transmitter side power source may not be sufficiently charged.

<Problems to be Solved by the Invention> In view of the problems of the prior art, the main object of the present invention is to provide an anti-theft device that ensures charging of the power source on the transmitter side and always operates well. Our goal is to provide the following.

<Means for Solving the Problems> According to the present invention, such an object is to provide a transmitter that transmits a code signal by operating a switch, and a transmitter that receives the signal and selects a specific device based on the result of checking the code. an anti-theft device comprising a receiver that is operable, the transmitter-side power source being charged by the receiver-side power source by making electrical contact between the transmitter and the receiver; When charging the transmitter side power source,
This is achieved by providing an anti-theft device characterized in that transmission of the signal by operating the switch is prohibited.

<Function> In this way, the transmitter side power source is reliably charged.

<Embodiments> The present invention will now be described in detail with reference to specific embodiments with reference to the accompanying drawings.

1 and 2 show a vehicle anti-theft device to which the anti-theft device according to the present invention is applied. This device includes a key switch unit 2 that also serves as a steering lock provided on a steering column or the like on the vehicle 1 side, a door key switch 3 provided on a grip portion of a door of the vehicle 1, and a key switch 3 that locks the door lock.
Control device 4 that controls unlocking and engine starting
and a key device 5 which acts on the door key switch 3 to lock and unlock the door and which is inserted into an ignition key switch 2a provided in the key switch unit 2 to start the engine.

The key device 5 includes a key body 6 and a grip portion 7, and the grip portion 7 has a transmitter 8 built therein. A push button switch 9 is provided on the surface of the grip 7. And the key body 6 inside the grip part 7
A pair of light-emitting elements 10 made of LED elements are provided at opposing portions with their base ends sandwiched in between, with their optical axes directed generally toward the tip of the key body 6. Further, a pair of contacts 11 are provided at the edge of the key body 6 near the base end.

As shown in FIG. 1, the door key switch 3 of the vehicle 1 is of a known cylinder lock type, and can be operated by inserting the key body 6 into the key cylinder and rotating the key device 5, or by remote control as described later. The door is set to be locked or unlocked. A light receiving element 12 made of a phototransistor is provided near the key cylinder. This light receiving element 1
2 is connected to the control device 4. Further, the control device 4 is supplied with power from an on-vehicle battery 41.

As shown in Figure 2, the key switch unit 2
Ignition key switch 2a installed in
is configured such that the key body 6 can be inserted therein, and has therein a mechanical contact that closes depending on the rotational position of the key device 5, and the above-mentioned contact 11.
A pair of corresponding contacts 14 that can be contacted are provided. Further, in the key switch unit 2, a light receiving element 15 made of a phototransistor is located at a position opposite to one light emitting element 10 of the key device 5 inserted in the ignition key switch 2a.
is provided. The corresponding contact 14 and the light receiving element 15 are connected to the control device 4.

FIG. 3 is a block diagram schematically showing the structure of a vehicle anti-theft device based on the present invention.

Light emitting element 1 provided in the grip part 7 of the key device 5
0 is connected to a light emitting circuit 18 in the transmitter 8, and the light emitting circuit 18 is connected to a CPU 19 that stores a unique code set for each vehicle. CPU19 is
It is connected to a first switch circuit 20 via a push button switch 9. The first switch circuit 20 is connected to a rechargeable battery 22. The first switch circuit 20 is also connected to a contact circuit 23 which is a diode bridge circuit connected to the contact 11. In this first switch circuit 20, the contact 11 corresponds to the corresponding contact 14.
The push button switch 9 is set to be turned on only when it is not in contact with the push button switch 9, and the push button switch 9 can be operated.

On the other hand, the CPU 19 is also connected to a second switch circuit 21 , and the second switch circuit 21 is connected to a contact circuit 23 . This second switch circuit 21 is interlocked with the first switch circuit 20, is turned on only when both contacts 11 and 14 are in contact with each other, and sends a predetermined trigger signal to the CPU 19 regardless of the operation of the push button switch 9. It is set so that it can be input.

Here, the CPU 19, the light emitting circuit 18, and the light emitting element 10 are connected to the battery 22 via the first switch circuit 20 when both the contacts 11 and 14 are in contact with each other.
, and when both contacts are not in contact, the second switch circuit 21 and the contact circuit 2
3. Power is supplied from the vehicle battery 41 through both contacts 11 and 14. Further, the battery 22 is connected to a contact circuit 23 and is charged by an on-vehicle battery 41 via both contacts 11 and 14.

Inside the control device 4 on the vehicle 1 side, a light receiving circuit 25 is provided which is connected to the light receiving element 12 of the door key switch 3 and the light receiving element 15 of the ignition key switch 2a. memorize the same code as the unique code of
It is connected to CPU26. The CPU 26 includes a door lock output circuit 28 and a relay control output circuit 30.
is also connected. Door lock output circuit 28
is a door lock device 3 that locks or unlocks the door.
6. The relay control output circuit 30 also includes a main relay 42 for supplying power from an on-vehicle battery 41 to an engine control device 37 connected to the ignition device and fuel injection device of the engine to drive and control both devices, and a starter motor. 4
It is connected to a starter relay 44 for driving the motor 3 to turn both relays on and off.

Note that the charging control circuit 45 in the control device 3 is connected to the corresponding contact 14 in the ignition key switch 2a.

Ignition key switch 2a is “LOCK”
The switch can be set to the "ACC", "ON", and "ST" positions, and when the switch is set to the "ON" position, power is supplied to the main relay 42 from the vehicle battery 41. It's becoming like that. Also, ignition key switch 2a is turned “ON”.
When the main relay 42 and the starter relay 44 are set to the "ST" position, power is supplied to the main relay 42 and the starter relay 44.

Next, the operation of the above-described anti-theft device will be explained in detail.

When the key device 5 is pointed at the door key switch 3 and the push button switch 9 is pressed, the first switch circuit 20 is turned on, so a trigger signal is input to the CPU 19, which generates a unique code signal and activates the light emitting circuit. 18. Transmit an infrared code signal to the light receiving element 12 via the light emitting element 10.

When the light receiving element 12 receives the code signal, the code signal is input to the CPU 26 via the light receiving circuit 25 in the control device 4, and the unique code is verified in the CPU 26. If the unique code is verified to be compatible, the door lock device 36 is activated via the door lock output circuit 28 to lock or unlock the door lock.

When the key body 6 of the key device 5 is inserted into the ignition key switch 2a, the contacts 11 come into contact with the corresponding contacts 14, and the first
The switch circuit 20 is turned off, and the second switch circuit 21 is turned on. Then, a predetermined trigger signal is input from the second switch circuit 21 to the CPU 19, and the CPU 19 generates a unique code signal, which is sent to the light receiving element 15 via the light emitting circuit 18 and the light emitting element 10.
Send a code signal towards.

On the other hand, while the contacts 11 and 14 are in contact with each other, the battery 22 is properly charged by the on-vehicle battery 41 via the charging control circuit 45, the contacts 14, 11, and the contact circuit 23.

Here, the CPU 19 transmits the code signal a predetermined number of times by the trigger signal from the second switch circuit 21 while both contacts are in contact, and then transmits the code signal until the key body 6 is removed from the ignition key switch 2a and reinserted. is set to stop sending. Furthermore, as described above, while both contacts are in contact, the first switch circuit 20 is turned off and the second switch circuit 21 is turned on, making it impossible to operate the push button switch 9 and at the same time cutting off the power to the transmitter 8 side during this time. The supply will be performed from the on-vehicle battery 41. Therefore, the battery 22 is not consumed during charging.

When the light receiving element 15 receives the code signal, the code signal is input to the CPU 26 via the light receiving circuit 25, and the unique code is compared. When it is confirmed that the unique code is compatible, the main relay 42 and starter relay 44 are turned on via the relay output circuit 30. Then, when the sea device 5 is rotated and the ignition key switch 2a is set from the "ON" position to the "ST" position, the engine control device 37 drives and controls the engine's ignition device and fuel injection device. net switch 4
6, the starter motor is driven and the engine starts.

If the suitability of the unique code is not confirmed in the CPU 26, that is, if a code different from the unique code is input, or if the code is not input from the key device 5, the main relay 42 and starter relay 44 will not be turned on. , the engine cannot be started.

In this way, if an attempt is made to drive the vehicle 1 without verifying the unique code described above, the engine cannot be started, and theft is suitably prevented.

<Effects of the Invention> As described above, according to the present invention, the power source on the transmitter side is reliably charged without being wasted, and the transmitter always operates well, so the effects are extremely large. .

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a key device and a door key switch of an anti-theft device according to the present invention. FIG. 2 is a schematic diagram showing a state in which the key device of the anti-theft device according to the present invention is inserted into an ignition key switch. FIG. 3 is a block diagram showing the structure of an anti-theft device based on the present invention. 1...Vehicle, 2...Key switch unit, 2
a... Ignition key switch, 3... Door key switch, 4... Control device, 5... Key device, 6... Key body, 7... Grip section, 8... Transmitter, 9... Push button switch , 10... Light emitting element, 1
1... Contact, 12... Light receiving element, 14...
Corresponding contact, 15... Light receiving element, 18... Light emitting circuit, 19... CPU, 20... First switch circuit, 21... Second switch circuit, 22... Battery, 23... Contact circuit, 25... Light receiving circuit, 26...CPU, 28...Door lock output circuit, 30...Relay control output circuit, 36...Door lock device, 37...Engine control device, 41...
...In-vehicle battery, 42...Main relay, 43...
...Starter motor, 44...Starter relay, 4
5...Charging control circuit, 46...Magnetic switch.

Claims (1)

[Scope of Claims] 1. An anti-theft device comprising: a transmitter that transmits a code signal by operating a switch; and a receiver that receives the signal and enables a specific device to operate based on the code verification result. and a charging means for charging the transmitter side power source with the receiver side power source by making electrical contact between the transmitter and the receiver, when charging the transmitter side power source. , an anti-theft device characterized in that transmission of the signal by operating the switch is prohibited. 2. The anti-theft device according to claim 1, wherein the transmitter transmits the signal in conjunction with electrical contact of the receiver. 3. The specific device is an in-vehicle device, the transmitter is provided integrally with a key for starting a vehicle engine, and the electrical contact is made by inserting the key into a key switch of the vehicle. An anti-theft device according to claim 1 or 2, characterized in that: