JPH04111879A - Prevention device against key insertion - Google Patents

Abstract

PURPOSE:To prevent a miss of key insertion by providing a means to prevent a door from locking of a lock device when the key insertion through a key detection means and the door opening through a door state detection means are respectively detected. CONSTITUTION:When a door is opened in a state to insert a key into an ignition switch section, a key detection switch 1 and a door switch 2 are turned ON, and transistors 7 and 8 conduct. An oscillation circuit 5 is oscillated, a transistor 9 intermittently conducts to actuate a buzzer 4, and the first alarm is sounded. A lock prevention device 12 is also actuated by conducting the transistors 7 and 8, a lock switch 3 is turned ON when a lock knob of the lock device is tried to push-in, and a transistor 11 conducts. In addition, the value of input resistance is lowered to heighten oscillation frequency, and the second alarm sound having intervals higher than the first alarm sound are issued from the buzzer 4.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a device for preventing key lockup in a motor vehicle.

<Conventional Technology> The mistake of leaving the car with the key inserted in the ignition switch and locking the door occurs relatively frequently. To prevent this, the engine is stopped with the key inserted in the ignition switch.
A key removal prevention device has been put into practical use and is configured to emit a warning sound using a buzzer when the door is opened. On the other hand, keyless locking is also common; for example, by operating the door's locking device while operating the outer or inner handle of the door in the open direction, the door can be locked without using a key. .

<Problem to be solved by the invention> Since there is a keyless lock function as described above, in reality, it is difficult to make the mistake of operating the keyless lock and going outside while listening to the alarm sound from the device to prevent forgetting to remove the key. I had something to do.

The present invention has been made in view of these problems and aims to eliminate the locking of keys due to the above-mentioned careless mistakes.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a key detection means for detecting whether or not a key is inserted into an ignition switch section, and a key detection means for detecting whether or not a key is inserted into an ignition switch section, and a key detection means for detecting whether or not a key is inserted into an ignition switch section, and a key detection means for detecting whether or not a key is inserted into an ignition switch section. A door locking device is configured to lock a door locking device when the key is inserted and the door is opened. and lock prevention means.

In addition, a key detection means detects whether or not a key is inserted into the ignition switch section, and when the key detection means detects that a key is inserted, a predetermined code signal is inputted to open the door. and an unlocking means for unlocking the locking device.

<Operation> The fact that the key is inserted and the door is open can be considered a step before key lock-in occurs, but under these conditions, the locking device of the door is prevented from being locked. Therefore, key lockup is prevented.

In addition, in the case of locking devices whose locks are unlocked by a predetermined coded signal, the door can be opened even if the key is locked in, so the same result is obtained as if the key had only been locked in. No trouble will occur.

<Example> Next, the illustrated embodiment will be described.

FIG. 1 shows an embodiment of the first invention, and in the figure, 1 is a key detection switch that is turned on when the key is inserted into the ignition switch section, and 2 is a key detection switch that is turned on when the door is opened. 3 is a lock switch that is turned on when the door lock device is locked; 4 is a buzzer for generating an alarm sound. These switches and buzzers are those that have been conventionally installed in automobiles and can be used as they are.

5 is an operational amplifier 6, variable resistor VR, resistor R, R2,
This is an oscillation circuit consisting of a capacitor C and the like, and is connected to a battery terminal B via transistors 7 and 8. Further, the buzzer 4 is connected to the battery terminal B in series with the transistor 9, and the output side of the oscillation circuit 5 is connected to the transistor 9.
connected to the base of. Further, a series circuit of a variable resistor VR2 and a transistor 11 is connected in parallel to the input resistor 10 of the oscillation circuit 5. Each transistor 7.8 and 1
1 has switches 1, 2, and 3 connected to its base, respectively, and is configured to conduct when these switches are turned on.

12 is connected to battery terminal B via contact 13a of relay 13
The relay 13 is connected to the battery terminal B via transistors 7 and 8. This lock prevention device 12 operates to unlock the door lock device or prevent the lock knob from being pushed in when the relay 13 is activated. can be used.

This embodiment has the above-described configuration, and when the door is opened with the key inserted into the ignition switch portion, both the key detection switch 1 and the door switch 2 are turned on, and the transistors 7 and 8 are turned on. For this reason, the oscillation circuit 5 is powered on and oscillates, and the output of the oscillation circuit 5 causes the transistor 9 to intermittently conduct, activating the buzzer 4 and emitting the first alarm sound.

Further, when the transistors 7.8 are made conductive, the lock prevention device 12 is activated, so that the lock knob of the lock device cannot be pushed in. However, if an attempt is made to force the lock knob, the lock switch 3 is turned on and the transistor 11 is made conductive. Therefore, the input resistance value of the oscillation circuit 5 decreases and the oscillation frequency increases, causing the buzzer 4 to emit a second alarm sound with a higher pitch than the first alarm sound. The buzzer has a first resonance point with a high frequency and a second resonance point with a low frequency, and the variable resistors VR and VR2 are used for adjusting the frequency of the oscillation circuit 5 to match these resonance points.

As described above, in this embodiment, in addition to the function of disabling or unlocking according to the present invention,
It also has a function to alert you with two types of alarm sounds.
By providing double means to prevent mistakes, key lock-up can be more reliably prevented.

In the above-described embodiment, when the door is opened with the key inserted into the ignition switch part, the lock prevention device 12 is activated immediately; however, for example, when the outer handle of the door is operated for keyless locking in this state, It is also possible for the lock prevention device 12 to be activated. This can be easily realized by using a handle switch that is turned on when the outer handle is operated in the opening direction, and by creating a circuit in which the relay 13 is activated when the handle switch is turned on.

FIG. 2 shows a second embodiment of the invention, and the same parts as in FIG. 1 are designated by the same reference numerals.

In the figure, 15 is a keyboard, 16 is a decryption circuit,
17 is a lock release device. The keyboard 15 and the decryption circuit 16 are similar to those in a known keyless entry system, and the decryption circuit 16 is connected to the battery terminal B in series with a transistor 18, and the base of the transistor 18 connects to the diode 19. It is connected between the transistors 7 and 8 through the transistors 7 and 8. Lock release device 17
This device is similar to the lock prevention device 12 shown in FIG. 1, and is activated by a release signal outputted from the decryption circuit 16 to unlock the door lock device.

This embodiment has the above-mentioned configuration, and when the door is locked with the key inserted in the ignition switch section, the key detection switch 1 is on, so the transistor 7 becomes conductive and decrypts the code. Circuit 16 is activated. Therefore, when a code number is input from the keyboard 15, the code decoding circuit 16 decodes it, and if it matches a predetermined code, a release signal is output, which activates the lock release device 17 and locks the door. will be unlocked. Therefore, even if the key is locked, the door can be opened immediately, and the same result as if the key was prevented from being locked is obtained. Note that unlocking is supposed to be done with a key, and unlocking with a code like the one above is not done very often, so the code should have a small number of digits, for example, 3 to 4 digits, so that it is easy to remember. It is desirable to keep it.

The above procedure is for the case where the key is actually locked, but in this example, similar to the one in Fig. 1, the buzzer 4 emits two types of alarm sounds and the key is locked when exiting the car. A warning will be issued against confinement. Therefore, the effect of preventing key lock-up is higher than that of the conventional key lock-out prevention device that uses a single alarm sound, and since there are double measures to prevent mistakes, troubles associated with key lock-up can be more reliably prevented. I can do it.

In addition, the switches and the like in the embodiments of each invention can basically be used as they are conventionally installed in automobiles, so it is possible to obtain a key locking prevention device with new functions without increasing costs. .

<Effects of the Invention> As is clear from the above-described embodiments, the first invention is capable of locking the door locking device when the key is inserted into the ignition switch section and the door is opened. This makes it possible to prevent the mistake of locking the key inside the car.

The second invention is such that when a key is inserted into the ignition switch section, the door locking device can be unlocked by manually inputting a predetermined coded signal. The lock can be easily released even if the

In addition, in any of the inventions, existing switches can be used as they are, so there is an advantage that a key locking prevention device with new functions can be realized at low cost.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the first invention, and FIG. 2 is a circuit diagram of an embodiment of the first invention.
1 is a circuit diagram of an embodiment of the invention; FIG. 1...Key detection switch, 2...Door switch, 3
・Lock switch, 12...Lock prevention device, 15・
Keyboard, 16...Code decoding circuit, 17...Lock release device.

Claims (2)

[Claims] (1) A key detection means for detecting whether the key is inserted into the ignition switch; a door state detection means for detecting whether the door is open; and a key detection means for detecting whether the key is inserted into the ignition switch. A key locking prevention device comprising: a lock prevention device that prevents a door locking device from being locked when the door state detection device detects that the door is opened. . (2) A key detection means for detecting whether or not a key is inserted into the ignition switch section; A key trapping prevention device comprising: a lock release means for unlocking a door lock device.