JPS62221952A - Theft preventing device for vehicle - Google Patents

Abstract

PURPOSE:To prevent engine starting due to picking or a wrong key by setting the load of a starter, an engine controller and the like to be in a ready condition for operation only when a light receiving element signal of a steering lock coincides with the code signal set beforehand. CONSTITUTION:A key body 1 is provided with an electrode 1b connected to the terminal 2a of a steering lock 2 for power supply, and also to light emitting element 1d for emitting light based on the code set beforehand when power is supplied. Meanwhile, the steering lock 2 is provided with a light receiving element 2c in order to receive light from the emitting element 1d. And, when a groove 1a of the key body 1 coincides with the key hole 2a of the steering lock 2 for swinging the key body 1, a signal from said light receiving element 2c is input to a light emitting circuit 3. Thereby, whether or not the signal coincides with the set code in a memory circuit 3c, and when it does not, operation of a starter, an engine controller and the like is set to be in an inoperative condition. Consequently, malfeasance by picking or a wrong key can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle anti-theft device that combines a key body having a light emitting element and a steering lock having a light receiving element.

[Conventional technology]

Conventionally, the number of keys for vehicles such as automobiles has been determined by the type of groove formed in the key.

Therefore, it is difficult to increase the number of keys using only the types of grooves, and there is also a possibility that unlocking may occur by pinking (illegal means).

Therefore, in recent years, instead of determining the number of keys only by the groove of the key, other discrimination means have been incorporated into the key itself, so that the lock can be unlocked when both the groove and other discrimination means match. An anti-theft device for a vehicle exists, for example, as U.S. Pat. No. 4,148,372.

The present invention requires that the key is inserted into the steering lock and rotated to the starting position as a condition for starting the engine, and that the resistance value of the resistance pellet embedded in the key is equal to the resistance value preset in the vehicle. The engine starts when the two match.

[Problem that the invention seeks to solve]

By the way, in the above-mentioned U.S. patent, it is determined that the keys are different depending on the resistance value, so the types of keys are extremely limited and the anti-theft effect cannot be expected to be very effective. There has been a problem in that the resistance value changes depending on humidity, resulting in many malfunctions.

[Means for solving problems]

The present invention provides a vehicle theft prevention device that solves the above-mentioned problems, and includes a light emitting circuit that has an electrode and sends out a signal according to a preset code when power is applied to the electrode; A key body having a light emitting element that emits light in response to a signal from the light emitting circuit, and a terminal connected to the electrode and supplying power to the light emitting circuit in a key hole into which the key body is inserted; A steering lock that has a light receiving element that receives light from the steering lock determines whether the signal from the light receiving element of the steering lock matches a preset code signal, and when they match, the load on the starter or engine controller, etc. is reduced. This is accomplished by a light receiving circuit that is placed in an operable state.

[Effect]

The vehicle anti-theft device of the present invention is provided with an electrode connected to a terminal of a steering lock on the key body and supplied with power, and a light emitting element that emits light based on a preset code when power is supplied. On the other hand, the steering lock is provided with a light receiving element that receives light from the light emitting element, and it is determined whether the signal from the light receiving element matches a code signal preset on the vehicle side. Since the load such as the starter or engine controller is ready for operation when the engine is turned on, there is no possibility of pinking or starting the engine with an unauthorized key, and the number of miskeys is dramatically increased compared to the conventional method. It is something that can be done.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described with reference to the drawings.

Figure 1 shows the main body of the Ibnira Shiran key, where I is the key main body in which a groove 1a corresponding to a vehicle key is formed, and electrodes 1b are formed in an insulated state on opposing parts of the base. There is. Further, a molded portion 1c which is a gripping portion is integrally formed on this key body 1, and a light emitting element 1d which is a pair of light emitting diodes is formed toward the key plate side.
is buried with a portion exposed, and a light emitting circuit 3 shown in FIG. 3 is buried inside.

Fig. 2 shows a steering lock on the vehicle side into which the key body 1 is inserted, and 2 is the steering lock body, and a key hole 2a into which the key body 1 is inserted, and a portion facing the key hole 2a. A terminal 2b is provided. and,
When the key body 1 is inserted into the key hole a, the key body 1 can be rotated when the groove 1a of the key body 1 and the key of the steering lock body 2 match, and the terminal 2b and the key body 1 electrode 1b is connected to the light emitting circuit 3, and power is supplied to the light emitting circuit 3. Further, a light receiving element 2c is attached to the ignition ON position of the steering lock body 2, and is configured to receive light emitted by the light emitting element 1d of the key body 1.

A light receiving circuit 4 is connected to the light receiving element 2c, and determines whether a signal from the light receiving element 2c is a signal from the key of this vehicle.

Next, the light emitting circuit 3 embedded in the molded portion lc will be described with reference to FIG. 3. lb is the electrode of the key body 1 described above, and 1d is a light emitting diode. The pole changing circuit 3a is connected to the electrode 1b, and as described above, when the key body 1 is inserted into the steering lock body 2 and the electrode 1b and the terminal 2b are connected, a 12V DC voltage is supplied. However, since the + and - poles for the light emitting circuit 3 are not constant depending on the insertion direction of the key body 1, the circuit 3
This is to ensure that the correct voltage is applied to. That is, even if the key body 1 is inserted into the steering lock body 2 after being reversed by 18θ degrees, the correct voltage is applied to the light emitting circuit. Note that a diode rectifier circuit, for example, is used as this polarity conversion circuit.

A control circuit 3b is connected to the polarity conversion circuit 3a, and controls on/off the transistor 3d based on a signal from a storage circuit 3C, which will be described later, to blink the light emitting diode 1d. A specific code, which is a pulse signal, corresponding to a specific vehicle is recorded in the memory circuit 3C.

Therefore, insert the key body 1 into the hole 2 of the steering lock body 2.
When power is supplied to the light emitting circuit 3, the memory circuit 3C sends out a pulse signal of a specific code, and the control circuit 3b turns on and off the transistor 3d based on the pulse signal.

As a result, the light emitting element 1d turns on/off the transistor 3d.
Flashes when turned off.

Next, the light receiving circuit 4 connected to the steering lock main body 2 will be described with reference to FIG. 4. Reference numeral 2b is a terminal attached to the steering lock main body 2, and 2c is a light emitting diode.

4a is a steering lock main body 2 by the key main body 1;
The ignition switch 4b, which is closed when rotated to the on position, supplies power to the terminal 2b, outputs the signal received by the light receiving element 2c to a control circuit 4C, which will be described later, and the ignition switch 4a An input/output circuit 4c outputs a signal indicating that the ignition switch 4a is closed to a control circuit 4C, which supplies power to the terminal 2b when the ignition switch 4a is closed, and a memory circuit 4d, which will be described later, receives a signal from the light receiving element 2C. It is determined whether the signal is the same as the signal set in advance, and if they match, the transistor 4
4d is a memory circuit in which a code unique to the vehicle is stored; 4g is energized when transistor 4f is turned on; It is a relay whose contacts are closed.

The transistor 4e is connected to a warning device such as a buzzer, and the contact of the relay 4g is connected to a starter interlock relay (a relay that operates the starter only when the shift lever is in the parking position or neutral position in automatic vehicles). It is connected.

Next, the operation will be explained with reference to the flowcharts shown in FIGS. 5 and 6.

Now, when the correct key body 1 for the vehicle is inserted into the key hole 2a of the steering lock body 2, the electrode 1b of the key body 1 is connected to the terminal 2b, and when the key body 1 is rotated, the steering lock body 2 is rotated. Then, when the steering lock body 2 is rotated to the on position, the ignition switch 4a is closed, and as described above, power is supplied to the terminal 2b by the control circuit 4C, and power is supplied to the electrode 1b via this. Ru.

Therefore, the light emitting circuit 3 operates and the control circuit 3b operates the memory circuit 3.
The code C is read and a pulse signal is output to the transistor 3d. As a result, the transistor 3d turns on and off, causing the light emitting diode 1d to blink based on the pulse signal.

This blinking light from the light emitting diode 1d reaches the light receiving element 2C, so the light receiving element 2C outputs a pulse signal synchronized with the blinking light of the light emitting diode 1d, which is input to the control circuit 4C via the input/output circuit 4b. . And the control circuit 4
C reads this pulse signal and also reads a preset signal from the memory circuit 4d, and determines whether or not the input signal and the setting signal are once lost. the result,
If they match, an output is sent to the transistor 4', turning on the transistor 4f.

Therefore, since relay 4g is energized, its contacts are closed and sends an output to the starter interconnect relay.
Starter motor works.

Next, a case will be described in which the key body 1 can be inserted into the hole 2a of the steering lock body 2 even though the key is pinked or the key is not the correct key.

The steering lock main body 2 is also rotated by picking or an unauthorized key, but in the case of picking, the light receiving element 2c does not receive light because there is no light emitting diode, and therefore the light receiving circuit 4 does not receive any light. No action is taken.

On the other hand, when the steering lock main body 2 is rotated by an unauthorized key, power is supplied to the key main body 1, and the light emitting element 1d blinks in the same manner as described above. Since this is different from the signal from the memory circuit 4d that is preset in the vehicle, the control circuit 4C determines that they do not match and outputs a signal to the transistor 4e.

Therefore, the transistor 4e is turned on and drives the alarm device, so that an alarm is generated.

In the above embodiment, the case where the engine is started has been described, but it is also possible to control loads other than the engine, such as the trunk, the retractable roof, etc.

〔Effect of the invention〕

As described above, the present invention is capable of different keying operations using a keyway.
Since a different pulse is generated for each key and these pulses are sorted by a light-receiving element attached to the steering lock, the number of incorrect keys can be significantly increased compared to conventional ones. Since the power source for the light emission is obtained from the steering lock through the contact, there is no need to replace the battery and the device can be miniaturized.

[BRIEF DESCRIPTION OF THE DRAWINGS] The figures show an embodiment of the vehicle anti-theft device according to the present invention, in which FIG. 1 is a front view of the key body, FIG. 2 is a front view of the steering lock body, and FIG. FIG. 4 is a diagram of the light-emitting circuit molded on the key body, FIG. 4 is a diagram of the light-receiving circuit attached to the steering lock body, and FIGS. 5 and 6 are flowcharts showing the operation of the control circuit in the light-emitting circuit and the light-receiving circuit. 1... Key body, 1b... Electrode, 1d... Light emitting element, 2... Steering lock, 2b... Terminal, 2
c... Light receiving element, 3... Light emitting circuit, 4... Light receiving circuit. Patent applicant: Kokusan Metal Industry Co., Ltd. Figure 1 Figure 2 a b Figure 3 'Star F TOP

Claims (1)

[Scope of Claims] A key body having an electrode, a light emitting circuit that sends out a signal according to a preset code when power is applied to the electrode, and a light emitting element that emits light in response to a signal from the light emitting circuit. a steering lock having a terminal connected to the electrode and supplying power to the light emitting circuit in a key hole into which the key body is inserted, and having a light receiving element that receives light from the light emitting element; A light receiving circuit that determines whether or not the signal from the light receiving element of the lock matches a preset code signal, and when they match, makes a load such as a starter or an engine controller ready for operation. Anti-theft device for vehicles.