JPH0767900B2 - 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 for preventing a vehicle theft by collating an electronic code.

<Prior Art> Conventionally, the key switch using a mechanical cylinder lock enables the engine of a vehicle to be started to prevent the vehicle from being stolen. However, since the mechanical key can be duplicated relatively easily, a sufficient antitheft effect is not necessarily obtained.

Therefore, for example, in Japanese Unexamined Patent Publication No. 57-90237, a fuel supply device, an ignition device, etc. are obtained by inserting a mechanical key into an ignition key switch and receiving an electronic code from a portable transmitter for verification. There is disclosed an anti-theft device capable of starting an engine of a vehicle by turning on. In addition, a relay for connecting an ignition switch and an engine control device for controlling fuel supply to the engine is provided, and the relay is driven by a control unit that collates an electronic code to control the start of the engine. Anti-theft devices are possible. In any case, however, if the control unit is still operable after the code is checked and the engine is started, the electronic code will be reissued if the engine is stopped without turning off the first switch for some reason. Since it is necessary to send and collate the data, it is very inconvenient and inconvenient for operation.

<Problems to be Solved by the Invention> Therefore, an object of the present invention is to eliminate the need for re-verification of the electronic code after the engine is once started, for the control unit that can start the engine by collating the electronic code. It is to provide a highly reliable vehicle theft prevention device.

<Means for Solving Problems> According to the present invention, the above-described object is achieved by an engine control device connected to a power source through an ignition switch, an electronic code input means, and an input from the input means. And a control circuit for collating the electronic code with an electronic code preset in the storage device to output a collation match / mismatch signal, and enabling / disabling the engine control device by the collation match / mismatch signal. An output circuit for selectively controlling the state, and when the coincidence signal is output from the control circuit, the operable state of the engine control device is selected, and the engine is started when the ignition switch is closed together therewith. A vehicle theft prevention device configured as described above,
The output circuit retains the operable state of the engine control device independently from the control of the control circuit after receiving the collation coincidence signal from the control circuit and once selecting the operable state of the engine control device. The present invention is achieved by providing a vehicle theft prevention device characterized by comprising a self-holding circuit.

<Operation> In this way, after the engine is once started by collating and matching the electronic codes, the operation of the engine is controlled by the ignition switch as in the conventional operation. Therefore, for restarting when the engine is stalled, it is not necessary to use a wireless key such as infrared rays or radio waves, or an electronic code signal input from a keyboard, and operability is not impaired. In addition, once the electronic code signal is received and verified, it does not affect the engine control without continuing to output the verification result from the control circuit, so it is necessary to supply power from the main power supply to the control circuit. Power consumption is also reduced.

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

FIG. 1 generally shows a vehicle theft prevention device according to the present invention. This device includes a key switch unit 2 provided on a steering column or the like on the side of the vehicle 1 and also serving as a steering lock and an ignition switch, a control circuit 3 for controlling engine starting and warning means, and a key switch unit 2 inserted into the key switch unit 2. Key 4 which enables the engine to be started.

The key 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, for example, LEDs are arranged on both sides of the root portion of the key body 5 in the grip portion 6 with their optical axes generally oriented in the tip direction of the key body 5. Further, a pair of contacts 9 are provided on both sides of the base end of the key body 5.

The key switch unit 2 is a well-known cylinder lock in which the key body 5 is inserted and used, and a key switch 2a having a mechanical contact point that is closed according to the rotational position of the key 4,
The key body 5 is provided with a corresponding contact 10 that comes into contact with the contact 9 and a light receiving element 11 formed of a phototransistor facing one light emitting element 8 of the key 4. The key switch 2a is connected to the vehicle-mounted battery 31, and the corresponding contact 10 and the light receiving element 11 are connected to the control circuit 3.

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

The light emitting element 8 is connected to a CPU 13 which stores a unique code set for each vehicle via a light emitting circuit 12 which is a part of the transmitter 7, and a trigger circuit 14 is connected to the CPU 13. The trigger circuit 14 includes a contact 9 and a charge / discharge battery 15
The contact circuit 17 connected to and is connected. Further, a push button switch 16 which is manually operated from the outside is connected to the trigger circuit 14.

The control circuit 3 on the vehicle 1 side has a CPU 21 that stores the same code as the above-mentioned unique code, and is connected to the light receiving element 11 on the key switch unit 2 side via the light receiving circuit 20. CPU21
Are connected to the keyboard 27, the relay control output circuit 22 and the alarm generation circuit 23, respectively.

The relay control output circuit 22 includes a main relay 32 for supplying power from an in-vehicle battery 31 to an engine control device 30 including an engine ignition device, a fuel injection device and the like, and a starter relay 34 capable of driving a starter motor 33 of the engine. Connected to. The alarm generation circuit 23 includes an alarm signal output circuit 24
It is connected to the horn 35 and the headlight 36 via.
Further, the alarm generation circuit 23 is supplied with power to the sensor 37 that detects that the key switch 2a is in the ON position, the sensor 38 that detects that power is supplied to the engine control device 30, and the starter motor 33. A sensor 39 for detecting that the sensor is connected is connected via the input circuit 25.

The charge control circuit 26 connected to the battery 31 is connected to the corresponding contact 10 of the key switch unit 2, and when the corresponding contact 10 contacts the contact 9, the battery 15 can be charged via the contact circuit 17. it can.

When the key switch 2a is connected to the ON position and the main relay 32 is turned on, the engine control device 30 is supplied with power from the vehicle-mounted battery 31 to enable the engine to start.
Further, when the key switch 2a is connected to the ST position and the starter relay 34 is turned on, the starter motor 33 is driven by supplying power from the battery 31 via the magnet switch 40.

As shown in FIG. 3, the relay control output circuit 22 includes a transistor T, a relay 41, and a diode D. The transistor T has a base connected to the CPU 21 and an emitter grounded. The collector of the transistor T is connected to the contact 42 at the ON position of the key switch 2a as the ignition switch and the anode of the diode D via the coil 41a of the relay 41. The cathode of the diode D is the coil 32 of the main relay 32 connected to the contact 42.
It is connected between a and one contact 41b of the relay 41.

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

When the key body 5 is inserted into the key switch unit 2 and the contact 9 and the corresponding contact 10 come into contact with each other, a signal for confirming this contact is sent from the circuit 17 to the trigger circuit 14. Then, based on the command from the trigger circuit 14, the CPU 13
Generates a code signal, and the light emitting element 8 passes through the light emitting circuit 12.
Lights up and the infrared code signal is transmitted. In this case,
Trigger circuit 14, by pressing the push button switch 16,
It is also possible to operate the CPU 13 and the light emitting circuit 12 to transmit the code signal from the light emitting element 8.

When the CPU 21 of the control circuit 3 collates the code signal transmitted through the light receiving element 11 and the light receiving circuit 20 with the unique code stored by the CPU 21 and confirms that the two match, the relay control output circuit 22 is activated to activate the main circuit. Relay 32 and starter relay
Turn on 34. As a result, power can be supplied from the battery 31 to the engine control device 30 and the starter motor 33, and the engine can be started. When the CPU 21 confirms that the code signal matches the unique code, the CPU 21 issues an alarm generation prohibition command to the alarm generation circuit 23. Therefore, the engine can be operated normally until the key 4 is pulled out from the key switch unit 2.

Since the alarm generation circuit 23 is always on unless the CPU 21 issues an alarm generation prohibition command, an alarm is generated immediately when a signal is input from the sensors 37 to 39. Further, for example, when a code signal is not input due to a failure of the transmitter 7 of the key 4 or a duplicate key having no transmitter is used, the unique code can be directly input from the keyboard 27 as an auxiliary input device. it can.

When the key switch 2a is connected to the ON position and the CPU 21 confirms that the code signals match and issues a command to the relay control output circuit 22, the transistor T operates to turn on the relay 41, which causes the main relay 32 to operate. Is turned on, and the engine control device 30 is connected to the battery 31. After that, even if the transistor T is changed from the ON state to the OFF state due to a malfunction of the CPU 21, the relay 41 is not released because the diode D is provided as described above,
The main relay 32 can be kept in the ON state. Thus, as long as the key 4 is in the ON position of the key switch 2a,
The engine control device 30 can be maintained in the ON state. Therefore,
The engine once started will not be stopped due to the power supply to the engine control unit being abruptly cut off.

On the other hand, when the CPU 21 cannot confirm the coincidence of the input code signals, or when the code signal is not input from either the key 4 or the keyboard 27, the alarm generation circuit 23 is not released and is turned on. Maintained. Further, no command is issued to the relay control output circuit 22 to operate the relays 32 and 34, and the engine control device 30 and the starter motor 33
Cannot be driven to start the engine. When the key switch 2a is connected to the ON side in this state, the horn 35 and the headlight 36 are activated by a signal input from the sensor 37 and an alarm is generated. Further, even when the battery 31 is directly connected to the engine control device 30 and the starter motor 33, an alarm is similarly issued by the signals input from the sensors 38 and 39.

Further, although the main relay is provided between the ignition switch and the engine control device in the above-described embodiment, a relay circuit or the like is provided between the fuel supply device, the ignition device or the like and the vehicle-mounted battery that constitute the engine control device. In the case of a vehicle anti-theft device that controls them individually on and off,
By applying the present invention, a self-holding circuit can be provided in the control output circuit of each relay circuit.

<Effects of the Invention> As described above, according to the present invention, if the engine can be started based on the electronic code comparison result, in the vehicle theft prevention device, once the engine is properly started, the CPU cannot operate.
Even if a command is issued to stop the engine by turning off the main relay due to a malfunction of the engine, or the engine is stopped for some other reason, the on state of the main relay is maintained by itself. Alternatively, it is not necessary to input an electronic code signal from the keyboard. Therefore, the operability can be further improved without impairing the reliability of the vehicle antitheft device. In addition, once the control circuit receives and collates the electronic code signal, it does not affect the engine control even if it stops the function of continuously outputting the collation result. It is not needed and may reduce power consumption.

[Brief description of drawings]

FIG. 1 is a schematic view showing a state where a key of a vehicle antitheft device according to the present invention is inserted into a key switch. FIG. 2 is a block diagram showing the configuration of a vehicle theft prevention device based on the present invention. FIG. 3 is a circuit diagram showing a relay control output circuit. 1 ... Vehicle, 2 ... Key switch 2a ... Key switch, 3 ... Control circuit 4 ... Key, 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 16 …… Push button switch 17 …… Contact circuit, 20 …… Light receiving circuit 21 …… CPU, 22 …… Relay control output circuit 23 …… Alarm generation circuit, 24 …… Alarm signal output circuit 25 …… Input circuit, 26 …… Charge control circuit 27 …… Keyboard, 30 …… Engine control unit 31 In-vehicle battery 32 Main relay 32a Coil 33 Starter motor 34 Starter relay 35 Horn 36 Headlight 37 to 38 Sensor 40 Magnet switch 41 Relay, 41a …… Coil 41b …… Contact, 42 …… Contact

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masaaki Fukamachi, 3700 Wadayama, Shimonaka, Sadohara-cho, Miyazaki-gun, Miyazaki-gun, Miyako Wadayama, Inc. (72) Kazuhiro Sakata, Katsuhiro Sakata, Miyazaki-gun, Miyazaki-gun Wadayama, 3700 Address, Honda Lock Co., Ltd. (56) References: Saku 57-8366 (JP, U)

Claims (3)

[Claims] 1. An engine control device connected to a power source through an ignition switch, an electronic code input means, an electronic code input from the input means, and an electronic code preset in a storage device. And a control circuit that outputs a collation match / mismatch signal by collating
An output circuit for selectively controlling the operable / inoperable state of the engine control device by a non-coincidence signal, and when the coincidence signal is output from the control circuit, the operational state of the engine control device is selected. A vehicle theft prevention device configured to start an engine when the ignition switch is closed, wherein the output circuit receives a collation match signal from the control circuit and changes an operable state of the engine control device. A vehicle anti-theft device comprising a self-holding circuit for holding the operable state of the engine control device independently of the control of the control circuit once selected. 2. The ignition switch has a mechanical collating means and a contact which is closed when the mechanical collating coincides with each other.
Vehicle theft prevention device described in the item. 3. The output circuit drives a relay connected between the ignition switch and the engine control device to selectively control an operable / inoperable state of the engine control device. The vehicle antitheft device according to claim 1 or 2, which is characterized.