JP2552876B2 - Vehicle theft prevention device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle theft prevention device, and more particularly to a device that prevents the vehicle body from being stolen due to an unauthorized engine start.

<Prior Art> Conventionally, a key switch using a mechanical cylinder lock is required to start a vehicle engine,
It was preventing the vehicle from being stolen. However, since the key can be copied relatively easily, a sufficient antitheft effect has not necessarily been obtained.

Therefore, for example, in Japanese Unexamined Patent Publication No. 57-90237, after inserting a mechanical key into an ignition key switch and closing the switch, a vehicle side receives a signal having a unique code set for each vehicle from a portable transmitter. There is disclosed a vehicle anti-theft device that transmits a signal to a device and the receiver can start the vehicle engine based on the result of matching the code. According to this device, the vehicle engine cannot be started only by duplicating the key, and the theft of the vehicle by the duplicating key is relatively reliably prevented. However, it is not always possible to deal with the case where the vehicle engine is started by directly connecting the power source to the ignition device of the vehicle engine or the starter motor, and the driver cannot close the key switch or from the transmitter. Therefore, there is a problem that the operation becomes complicated because it is necessary to follow the procedure of transmitting the signal of, and starting the engine.

<Problems to be Solved by the Invention> In view of the above-mentioned problems of the conventional technology, a main object of the present invention is to provide a vehicle antitheft device capable of surely preventing a vehicle theft without impairing operability. To provide.

<Means for Solving the Problems> According to the present invention, such an object is to provide a transmitter for transmitting a code signal and an ignition system and / or a fuel system of an engine connected to a power source through an ignition switch. An engine control device for controlling, an alarm means, a code signal transmitted from the transmitter is collated with a prestored code signal, and a match / mismatch signal corresponding to the match / mismatch is provided to the engine control device and the alarm. Determining means for outputting to the means, the engine control device controls the engine into an operable state / inoperable state in accordance with a match / mismatch signal output from the determining means, and the alarm means, A vehicle theft prevention device adapted to issue an alarm in response to a disagreement signal from the determination means, wherein the engine control device is configured to start an engine. Output means for outputting an engine start detection signal indicating that the engine start detection signal is output from the engine control device except when the collation results of the code signals match. This is achieved by providing a vehicle theft prevention device characterized in that it outputs the disagreement signal to the engine control device and the alarm means when input.

<Operation> In this way, it is possible to prevent the vehicle from being stolen by directly connecting the power source line to the engine ignition device or the starter motor without complicating the engine starting operation. In particular, when the present invention is applied to a locking device that uses both mechanical key verification and electronic code verification, a more reliable antitheft effect can be achieved.

<Embodiment> Hereinafter, the present invention will be described in detail with reference to a specific embodiment with reference to the accompanying drawings.

FIG. 1 shows a vehicle antitheft device according to the present invention. This device includes a key switch unit 2 provided with a key switch 2a that also serves as a steering lock and an ignition switch provided on a steering column or the like on the vehicle 1 side, an engine control device 27, which will be described later, and a code matching the alarm means. / The control device 3 includes a determination means for outputting a non-coincidence signal, and the key device 4 for inserting the key switch 2a and enabling the engine to start.

The key device 4 includes a key body 5 and a grip portion 6, and the grip portion 6 has a transmitter 7 built therein. A pair of light emitting elements 8 made of LED elements are provided in a portion of the grip portion 6 that faces the base end portion of the key body 5 so as to face each other. ing.
Further, a pair of contacts 9 are provided on the edge portion near the base end portion of the key body 5.

The key switch 2a provided in the key switch unit 2 on the vehicle 1 side is a well-known cylinder lock type, which allows the key body 5 to be inserted therein, and has the key device 4 inside thereof.
It has a mechanical contact that is closed according to the rotational position of the contact and a pair of corresponding contacts 10 that can contact the contact 9. Further, the key switch unit 2 is provided with a light receiving element 11 composed of a phototransistor facing one light emitting element 8 of the key body 5 inserted in the key switch 2a. The corresponding contact 10 and the light receiving element 11 are connected to the control device 3 described above.

FIG. 2 is a block diagram schematically showing the configuration of the vehicle antitheft device according to the present invention.

The light emitting element 8 provided on the grip portion 6 of the key device 4 is connected to the light emitting circuit 12 which is a part of the transmitter 7. The light emitting circuit 12 is a CP that stores a unique code set for each vehicle.
The trigger circuit 14 is connected to the CPU 13, and the CPU 13 is connected to the trigger circuit 14. The contact circuit 17 connected to the contact 9 and the rechargeable battery 15 is connected to the trigger circuit 14.

In the control device 3 provided on the vehicle 1 side,
A light receiving circuit 20 connected to the light receiving element 11 is provided, and the light receiving circuit 20 is connected to a CPU 21 which stores the same code as the above-mentioned unique code for each vehicle.

The CPU 21 has an alarm generation circuit 22, an input / output circuit 25 and a vehicle 1.
Is connected to a keyboard 23 provided in the passenger compartment.
The alarm generation circuit 22 is connected to the horn via the alarm signal output circuit 24.
The alarm means is connected to the headlight 36 and the headlight 36. Further, the input / output circuit 25 is connected to an engine control device 27 which is connected to both devices to drive and control the ignition device 32 and the fuel injection device 33 of the engine.

The charging control circuit 26 connected to the vehicle-mounted battery 31 is connected to the corresponding contact 10 in the key switch 2a,
When the contact comes into contact with the contact 9, the battery 15 can be charged through the contact circuit 17.

Key switch 2a is "LOCK", "ACC", "ON", "S
It can be set to each position of "T", and when it is set to the "ST" position through the "ON" position or the "ON" position,
The main relay 34 is turned on, and power is supplied from the vehicle-mounted battery 31 to the engine control device 27.

Next, the operation of the vehicle theft prevention device described above will be described in detail.

When the key body 5 is inserted into the key switch 2a, the key device 4 is rotated, and the key switch 2a passes the "ON" position, the engine control device 27 causes the engine ignition device 32 to rotate.
By driving and controlling the fuel injection device 33 and further setting it to the “ST” position, a starter motor (not shown) rotates and the engine starts. At this time, the engine control device
From 27, an engine start detection signal for confirming engine start is input to the CPU 21 via the input / output circuit 25 in the control device 3. Here, the engine state is monitored by the engine control device that controls the engine based on the outputs of various existing engine state detection sensors, so that it is not necessary to separately provide a sensor or the like for detecting the engine start, and the cost thereof can be reduced. Will not soar.

On the other hand, the contact 9 comes into contact with the corresponding contact 10 by the insertion operation of the key, and the contact circuit 17 sends a signal to the trigger circuit 14 to confirm the contact. Then, the CPU 13 generates a unique code signal based on a command from the trigger circuit 14, and transmits the infrared code signal to the light receiving element 11 via the light emitting circuit 12 and the light emitting element 8.

A code signal is input as an electronic code from the light receiving element 11 through the light receiving circuit 20 to the CPU 21 within a predetermined time that may be, for example, 30 seconds after the engine start detection signal from the engine control device 27 is input. Then, the CPU 21 collates with a preset regular code. When the electronic codes are collated and it is confirmed that they match, the judgment means in the control device 3 outputs a matching signal composed of a unique code to the alarm generation circuit 22 and the engine control device 27, whereby the engine control device is With the engine ignition device 32 and the fuel injection device 33, that is, the engine in an operable state, the vehicle 1 can be operated normally, etc. until the key switch 2a is set to the "LOCK" position. Here, if the code signal is not input to the CPU 21 due to a failure of the key device 4, for example, the driver can input the electronic code to the CPU 21 from the keyboard 23 as an auxiliary input device. ing.

Within the predetermined time after the engine start detection signal from the engine control device 27 is input to the CPU 21, if a match of the electronic code is not confirmed, that is, a code different from the unique code is input, or the code is If no input is made from either the key device 4 or the keyboard 23, the CPU2
From 1 through the input / output circuit 25 to the engine control device 27 is output a non-match signal consisting of a unique code, the control device,
The engine ignition device 32 and the fuel injection device 33 are made inoperable. Further, the CPU 21 also outputs a mismatch signal to the alarm generation circuit 22, and the alarm generation circuit outputs the horn 35 and the headlight based on this signal via the alarm signal output circuit 24.
Drive 36 to generate an alarm.

Further, when the key is not inserted into the key switch 2a and the engine control device 27 and the starter motor are connected so that power is directly supplied from the on-vehicle battery 31 as shown by a broken line A in FIG. Controller 27 to CPU2
Although the engine start detection signal is input to 1, the CPU 21 does not confirm that the electronic codes match, so a mismatch signal is output to the engine control device 27 and the warning signal output circuit 24, and the engine cannot operate. And the alarm is issued.

In this way, when the vehicle 1 is not driven by using the duplicate key which does not have the circuit for transmitting the above-mentioned code signal, or the engine control device 27 and the starter motor are connected so as to directly supply power. If the vehicle is not driven by the engine, the engine will stop and a warning will continue to be issued a predetermined time after the engine is started.

In this embodiment, both the mechanical key and the electronic code are collated, but only the mechanical key or only the electronic code may be collated. For example, in a vehicle using only mechanical keys, it is possible to provide a sensor for detecting that the contact of the key switch is in a predetermined position after starting the engine, and control the engine based on the detection result of this sensor.

Needless to say, the present invention is not limited to the above-mentioned embodiment and various applications are possible. For example, in the present embodiment, power is supplied to the transmitter 7 from the battery 15 on the key device 4 side, but power may be supplied from the in-vehicle battery 31 by inserting the key body 5 into the key switch. . Further, as an auxiliary transmitting means on the transmitter 7 side, a push button switch may be provided on the surface of the grip portion 6 of the key device 4, and the code signal may be transmitted by turning on the switch.

<Effects of the Invention> As described above, according to the present invention, not only when the duplicate key is used without impairing the operability of the engine start, but also when the engine is directly driven by directly connecting the electric system, Moreover, since the vehicle body is prevented from being stolen, its effect is extremely large.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a state in which a key device of a vehicle anti-theft device according to the present invention is inserted into a key switch. FIG. 2 is a block diagram showing a configuration of a vehicle theft prevention device according to the present invention. 1 ... Vehicle, 2 ... Key switch unit 2a ... Key switch, 3 ... Control device 4 ... Key device, 5 ... Key body 6 ... Grip, 7 ... Transmitter 8 ... Light emitting element, 9 …… Contact 10 …… Corresponding contact, 11 …… Light receiving element 12 …… Light emitting circuit, 13 …… CPU 14 …… Trigger circuit, 15 …… Battery 17 …… Contact circuit 20 …… Light receiving circuit 21 …… CPU, 22 …… Alarm generation circuit 23 …… Keyboard, 24 …… Alarm signal output circuit 25 …… Input / output circuit, 26 …… Charge control circuit 27 …… Engine control device 31 …… In-vehicle battery, 32 …… Engine ignition device 33 ...... Fuel injector, 34 ...... Main relay 35 ...... Horn, 36 ...... Headlight

Front page continuation (72) Inventor Kazuhiro Sakata 3700 Wadayama, Shimonaka, Sadowara-cho, Miyazaki-gun, Miyazaki Prefecture Honda Lock Co., Ltd. (56) Reference JP-A-55-68444 (JP, A) JP-A-SHO 62-88644 (JP, A) JP-A-49-7939 (JP, A) Actually developed 61-19861 (JP, U) US Patent 4200227 (US, U)

Claims (1)

(57) [Claims] 1. A transmitter for transmitting a code signal, an engine controller for controlling an ignition system and / or a fuel system of an engine connected to a power source via an ignition switch, an alarm means, and a transmitter for transmitting from the transmitter. And comparing the stored code signal with a previously stored code signal and outputting a match / mismatch signal corresponding to the match / mismatch to the engine control device and the alarm means. Controlling the engine in an operable / inoperable state in accordance with the match / mismatch signal output from the judging means, and the alarm means issuing an alarm in response to the mismatch signal from the judging means. The anti-theft device for a vehicle, wherein the engine control device outputs an engine start detection signal indicating that the engine has started to the determination means. Output means for inputting, and the determination means, when the engine start detection signal is input from the engine control device except when the collation result of the code signal matches, the engine control device and the alarm means. A vehicle theft prevention device, which outputs the non-coincidence signal.