JPS5922035B2 - Automotive electronic lock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic lock for an automobile engine that has an anti-theft effect.

Conventionally, mechanical locks have been used as automobile engine buckles, especially engine keys.

There are also some that use electronic locks.

In the former case, the car door was opened by picking, and the engine key was unlocked by pinking, and the car was often stolen.

In the latter case, the lock is unlocked by pressing multiple numeric keys in a predetermined order.
The lock may be unlocked by chance by pressing the numeric keys in a predetermined order through repeated trial and error.

In addition, in the case of electronic locks, the greater the number of digits in the unlock code signal for unlocking, the lower the probability that the lock will be unlocked by suppressing the numeric keypad through trial and error, as described above; This increases the number of times the person presses the numeric keys to unlock the lock, which may be cumbersome to operate.

The present invention has been made in view of the above, and provides an electronic engine lock in which an unlock signal of a predetermined one digit among the required digits for unlocking is given from a separately provided hidden switch. An object of the present invention is to provide an electronic lock for an automobile that reduces the number of times the numeric key is pressed to unlock the electronic lock.

The present invention will be explained below using examples.

FIG. 1 is a block diagram of an electronic lock for an automobile engine according to an embodiment of the present invention.

1 is a numeric keypad, 2 is a waveform shaping circuit that prevents chattering when outputting from numeric keypad 1 and shapes the waveform of the output pulse of numeric keypad 1, and 3 is a numeric keypad whose waveform has been shaped by waveform shaping circuit 2. - A BCD converter that converts the output Kapalya of key 1 into a BCD code, and 4 is a digital comparator (hereinafter simply referred to as a comparator) that uses the output of BCD converter 3 as a comparison input.

On the other hand, reference numeral 5 designates an OR gate which inputs a pulse generated by pressing the numeric key 1 from the waveform shaping circuit 2 and outputs it to an AND gate 6, and the output of the AND gate 6 is outputted to an address counter 7 and a penalty counter 8.

If the unlock input signal from the numeric keypad 1 is 4 digits, the address counter 7 may be configured with a quaternary counter, for example.
The penalty counter 8 is a counter corresponding to the permissible number of incorrect unlocking input signals. For example, if the unlocking input signal is 4 digits and the permissible number of times is 3, it is constituted by a hexadecimal counter.

The output of the address counter 7 is made of, for example, a matrix circuit, and is input to a code generation type 9 which outputs a BCD output preset corresponding to the output signal of the address counter 7 to the comparator 4 as a compared signal of the comparator 4.

On the other hand, the output pulse of the penalty counter 8 is input to the monostable multi-by break 10, and the output of the monostable multi-by break 10 is input to the ANDGETRO. The configuration is such that the AND gate 6 is closed during the set time of the monostable multi-bi break 10, and input from the numeric keypad 1 is not accepted.

Further, the time setting circuit 11 is, for example, a differentiation circuit 11 that differentiates the falling edge of the output pulse of the OR gate 5 as shown in FIG.
a, a differentiation circuit 11b that differentiates the rising edge of the output pulse of the OR gate 5; a flip-flop 11 that is set by the output of the differentiation circuit 11a and reset by the output of the differentiation circuit 11b;
c, a retriggerable monostable multi-bi break 11d that is triggered by the output of the differentiating circuit 11a, and a monostable multi-bi break consisting of an analog gate-N1e whose inputs are the output Q of the flip-flop 11C and the output of the monostable multi-bi break 11d. If the next ten key 1 is not pressed within the set time 11d, the address counter 7 and penalty counter 8 are reset by the output of the AND gate 11e through the OR gates 12 and 13.

Reference numeral 14 denotes a hidden switch connected in parallel to a predetermined switch of the numeric keypad 1, in this embodiment the switch for decimal number "8", and is set, for example, under the driver's seat.

Also, the connection between the hidden switch 14 and the numeric key 1 is
Connect in a device other than key 1.

Next, the Nant gate 15 is configured to input the output of the OR gate 5 and the output of the comparator 4, and the output of the Nant gate 15 is configured to reset the address counter 7 through the OR gate 13.

The output of the comparator 4 and the power of the address counter 7 are input to an ant gate 16, and the output of the ant gate 16 sets a flip-flop 17.

Flip-flop 17 generates an unlock signal from output terminal Q.

The output from the output terminal Q of the flip-flop 17 is input to the AND gate 18 and also to the differentiating circuit 19, which differentiates the signal at the output terminal Q of the flip-flop 17 to obtain the output signal of the differentiating circuit 19. The address counter 7 and penalty counter 8 are reset through the OR gates 13 and 12.

The on signal of the ignition switch 20 is an anti-gear
The output signal of the ant gate 18 is input to the ignition relay 3 through the driving transistor 30.
Drive through 1.

On the other hand, the inverted signal when the ignition switch 20 is turned on and the signal at the output terminal Q of the flip-flop 17 are input to the AND gate 21, and the output signal of the AND gate 21 drives the delay circuit 22, and the delayed output of the delay circuit 22 is output. The signal resets the flip-flop 17.

Further, 24 is an oil pressure switch that is turned on when the engine is stopped, and the output of the oil pressure switch 24 when the engine is stopped and the output signal from the output terminal Q of the flip-flop 17 are input to an AND gate 23. The delay circuit 22 is reset by the output signal of 23.

Further, output signals from a predetermined pushbutton switch of the numeric keypad 1 (in this embodiment, the 0'' switch) and an output terminal Q of the flip-flop 17 are input to an AND gate 26, and the output signal of the AND gate 26 is a simple one. The stable multi-by break 27 is triggered, and the output of the monostable multi-by break 27 is passed through the driving transistor 32 to excite the bonnet solenoid 33 for a time set in the mono-stable multi-by break 27, thereby unlocking the bonnet.

The operation of this embodiment configured as above will be explained.

Now assume that the unlock input signal is 3728 in decimal.

First, by sequentially pressing predetermined pushbutton switches on the numeric keypad 1, an unlocking input signal is input.

If the 3'' button on the numeric keypad 1 is now pressed, this signal is waveform-shaped and converted into BCD "3" by the BCD converter, which is applied to the comparator 4 as a comparison input.

At the same time, a signal generated by the first press of the pushbutton switch of the numeric keypad 1 is counted by an address counter 7 and a penalty counter 8 through an OR gate 5 and an AND gate 6.

The address counter is an output terminal when the above 1 pulse is input.
The code generator 9 outputs the output of BCD "3" to the comparator 4 as the compared input.

Then, the comparator 4 detects that the comparison input and the compared input match, and generates a high-level output as an output.

Since the output of the comparator 4 becomes high level, the NAND game'-N5 does not generate an output and the address counter 7 is not reset.

Next, when the ``7'' pushbutton switch of the numeric keypad 1 is pressed, the address counter 7 and penalty counter 8 detect that it is the second press, in the same way as above.
An output signal from the output terminal ■ of the address counter 7 (in this case, for example, the address counter 7 is a binary IT
It outputs l , 1 +1, but this l l , l l
The + output is output as a decimal number 2'' by an ant gate to the input terminal A2 of the code generator 9, and this is called an output signal from the output terminal (2).

The same applies below. ), the code generator 9 outputs BCD”7.
The comparator 4 detects that the comparison input and the compared input match and generates a high-level output.

Therefore, as before, the address counter 7 is not reset.

The same process as described above occurs when the push button switch "2" of the numeric keypad 1 is pressed next.

Subsequently pressing the hidden switch 14 is equivalent to pressing the 8" pushbutton switch of the numeric keypad 1, and the comparator 4 receives the BCD as a comparison input.
"8" is input.

On the other hand, the code generator 9 generates an output of BCD "8'" in response to the output signal from the output terminal ■ of the address counter 7.
The comparator 4 detects that the comparison input and the compared input match and generates a high level output.

Therefore, the output signal from the output terminal 1 of the address counter 7 and the output signal from the comparator 4 both become high level, and the ant gate 16 generates an output and outputs the output from the flip-flop 1.
7 generates a high level output at output terminal Q.

That is, the output terminal Q of the flip-flop 17 generates an output only when the unlocking input signal matches a preset setting signal, and this becomes the unlocking signal.

Also, in the above, the last digit '8' is the hidden switch 1.
4, the operator only needs to memorize the three-digit number, and pressing the hidden switch 14 is sufficient for the fourth digit.

Further, the operator only has to operate the pushbutton switch on the numeric keypad 1 three times, which reduces his or her troubles.

In addition, the operator may, for example, suppress the numeric keypad 1 with his right hand and operate the hidden switch 14 with his left hand.
The hidden switch 14 is easy to operate, and there is no fear that all the unlock codes will be read by the passenger.

Furthermore, since the hidden switch 14 is not connected within the numeric keypad 1, but is connected within a device other than the numeric keypad 1, it is possible to easily know which button on the numeric keypad 1 corresponds to the hidden switch 14. do not have.

Next, if an incorrect unlock input signal is applied, the comparator 4
does not generate a high level output, only the press signal of the numeric key 1 from the OR gate 5 is input to the Nante gate 15, the Nante gate 15 generates a high level output, and the address counter 7 is reset through the OR gate 13. Therefore, the address counter 7 starts counting again from the next press of the numeric key 1.

Therefore, an unlocking signal will not be generated from the flip-flop 17 unless correct unlocking input signals are input for all four digits consecutively.

Further, the falling and rising edges of the output of the OR gate 5 each time the push button switch of the numeric keypad 1 is pressed are differentiated by differentiating circuits 11a and 11b, and at the falling edge, the flip-flop 11c is set, and at the same time, the monostable multi-bi break 11d is set. Trigger, flip-flop 11C to AND gate 11e
Since the output of 1 and the output of the monostable multi-by break 11d are input, the time interval between each press of the push button switch of numeric key 1 is equal to that of the monostable multi-by break 1.
If it is longer than the set time of monostable multi-bi break 11d, the time setting circuit 11
generates an output and resets address counter 7 and penalty counter 8 through OR gate 12.13.

Furthermore, if the numeric key 1 is pressed 12 times in a row and there is no unlock input signal that matches the unlock code during this period, the penalty counter 8 will output an output due to the 122nd press of the numeric key 1. occurs, triggers monostable multi-by break 10, and monostable multi-by break 1
In order to close the AND gate 6 during the output period of 0, the ten
Even if the key 1 is operated, the signal is not input to the address counter 7.

Since various safety measures are provided in this way, the electronic lock will not be unlocked by trial and error.

Next, the case where the electronic lock is opened, that is, the case where the output terminal Q of the flip-flop 17 outputs a high level output will be explained.

When the output from the output terminal Q of the flip-flop 17 becomes high level, the output is differentiated by the differentiating circuit 19, and the output of the differentiating circuit 19 resets the address counter 7 and penalty counter 8 through the OR game N2, 13, and then Be prepared for key operations.

Note that the flip-flop 17 is not affected by this reset and continues to send out a high level output.

Then, when the ignition switch 20 is turned on, the power of the AND gate 18 becomes high,
The output of the AND gate 18 turns on the transistor 30, energizes the ignition relay 31, and ignites the engine.

Further, even if the numeric key 1 or the hidden switch 14 is pressed by mistake while the engine is running, the flip-flop 17 will not be affected.

Next, when the ignition switch 20 is turned off, the input from the ignition switch 20 to the AND gate 18 becomes a low level, the ignition relay 31 becomes de-energized, and the engine stops.

Furthermore, when the ignition switch 20 is turned off, the output of the AND gate 21 is set to a high level, and the delay circuit 22 is set by the AND gate 21. After the time set by the delay circuit 22 has elapsed, the output of the delay circuit 22 triggers the flip-flop. 17 is reset.

Therefore, unless the electronic lock is unlocked again by the unlocking input signal, the flip-flop 17 will not be set and will return to the state before it was unlocked.

Next, a case will be described in which the engine stops for some reason during engine operation.

At this time, the oil pressure switch 24 is turned on, and the indicator lamp 34 is lit.

Ignition switch 2 is turned on again due to engine stop.
0 to the off state, then turn the ignition switch 20
Turn on.

By turning off the ignition switch 20, the AND gate 21 generates a high level output and the delay circuit 2
2 drives.

On the other hand, when the ignition switch 20 is continuously turned on, the AND gate 23 generates an output since the oil pressure switch 24 is on, and the delay circuit 22 is reset by the output of the AND gate 23.

When the AND gate 23 generates the output, the delay circuit 22 is in operation, and the progress of the delay time of the delay circuit 22 is reset.

Therefore, even when the engine is stopped, the engine can be restarted without panic.

Recently, an oil pressure switch 24 has been installed to detect whether the engine is rotating, so the oil pressure switch can be used as described above, and there is no need to provide a new oil pressure switch.

Also, when the output from the output terminal Q of the flip-flop 17 is at a high level, the decimal number on the numeric keypad 1 + 10 II
When the push button switch is pressed, the AND gate 26 generates an output, the monostable multi-bi break 27 is triggered by the output of the AND gate 26', and the transistor 32 is turned on for the time set by the mono-stable multi-bi break 2γ. As a result, the bonnet solenoid 33 is energized and the bonnet can be opened manually.

As explained above, according to the electronic lock for an automobile engine of the present invention, it is impossible for a person who does not know the unlock code to unlock the lock.
It is almost impossible to unlock by trial and error.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
FIG. 3 is a block diagram of the time setting circuit shown in the figure. 1...Numeric keypad, 3...BCD converter, 4...Comparator, γ...Address counter, 8...Penalty Counter, 9...
...Code generator, 10°27 and 11d...
...monostable multi-by-break, 11...time setting circuit, 14...hidden switch, 1γ and 11c...flip-flop, 22...
・Delay circuit, 31...Ignition relay,
33...Bonnet solenoid.

Claims (1)

[Claims] 1. In an electronic automobile lock that generates an unlockable output only when an unlock code signal that matches a preset code signal of multiple digits is input, a code signal of a predetermined digit in the unlock code signal is input. The present invention is characterized in that another switch for generating the lock is provided at a position away from the keyboard, and when the unlock code signal is input, a code signal of a predetermined digit of the unlock code signal is output by operating the other switch. Electronic lock for automobiles.