JPS6026913B2 - 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 locks for automobile engines, particularly as 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 also unlocked by picking, 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 keypad in a predetermined order through trial and error. In addition, in the case of electronic locks, the greater the number of digits in the scale lock code signal for unlocking, the lower the probability that the scales will be locked by pressing the numeric keypad through trial and error as described above, but when driving This increases the number of times the person presses the numeric keys to unlock the lock, which may be cumbersome to operate. Furthermore, in the case of an electronic lock, if the engine stops after being started, the key operation must be performed again, resulting in the inconvenience that it takes time to start the engine.

The present invention has been made in view of the above, and provides an electronic lock for an automobile that can restart the engine with a simple operation without having to operate the key again in the case of an engine stop while the engine is running. be.

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 the numeric keypad, and 3 is a numeric keypad that has been waveform-shaped by waveform shaping circuit 2. This is a BCD converter that converts the output pulse of the key into a BCD code, and 4 is a digital comparator (hereinafter simply referred to as a comparator) which uses the output of the 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 blind lock input signal is 4 digits and the permissible number of times is 3, it is configured as a hexadecimal counter. The output of the address counter 7 is made of, for example, a matrix circuit, and is input to a code generator 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 inputted into the monostable multipipulator 1, and the output of the monostable multipipulator 10 is inputted into the AND gate 6, so that the unlock input signal is the unlock signal that yielded all three times. At certain times, the AND gate 6 is closed during the set time of the monostable multipipulator 10, so that 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 multipipulator 1ib which is triggered by the output of the differentiating circuit 11a, and an AND gate 11e whose inputs are the output Q of the flip-flop 11c and the output of the monostable multipipulator 11d; When the next ten key 1 is not pressed within the set time of the stable multipipulator 11d, the address counter 7 and the penalty counter 8 are reset by the output of the AND gate 11e through the OR gates 12 and 13. Further, 14 is a hidden switch connected in parallel to a predetermined switch of the numeric keypad 1, in this embodiment the switch "8", and is set, for example, under the driver's seat. Further, the connection between the hidden switch 14 and the numeric keypad 1 is made in a device other than the numeric keypad 1. Next, the NAND gate 15 receives the output of the OR gate 5 and the output of the comparator 4, and the output of the NAND gate 15 is configured to reset the address counter 7 through the OR gate 13.

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

Flip-flop 17 generates an unlocking 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. The differentiating circuit 19 differentiates the signal at the output terminal Q of the flip-flop 17. Address counter 7 and penalty counter 8 are reset through OR gates 13 and 12.

The ON signal of the ignition switch 20 is input to the AND gate 18, and the output signal of the AND gate 18 drives the ignition relay 31 through the driving transistor 30.

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. The delayed output signal resets the flip-flop 17.

Further, 24 is an oil pressure switch that is turned on when the engine is stopped, and shows the output and flip-flop of the oil pressure switch 24 when the engine is stopped. The output signal from the output terminal Q of the gate 17 is input to an AND gate 23, and the output signal of the AND gate 23 resets the delay circuit 22. In addition, the output of a predetermined pushbutton switch of the numeric keypad 1, in this embodiment the "0" switch, and the output signal from the output terminal Q of the flip-flop 17 are input to an AND gate 26;
The output signal triggers the monostable multipipelator 27, and the output of the monostable multipipelator 27 excites the bonnet solenoid 33 through the driving transistor 32 for the time set by the monostable multipipelator 27.
Configure to unlock the hood.

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

It is now assumed that the input signal of the sea bream lock is 3728 in IG Hayabusa number.

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 a BCD "3" by a 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. Therefore, 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 is at a high level, the NAND gate 15 does not generate an output and the address counter 7 is not reset. Next, when the pushbutton switch "7" on the numeric keypad 1 is pressed, the address counter 7 and penalty counter 8 detect that it is the second press, and the address counter 7 output terminal output signal (in this case, for example, the address counter 7 outputs a binary "1, 1", but this "1, 1" output is changed to "2" by an AND gate and output to the input terminals of the code generator 9). This is called the output signal from output terminal ■.

The same applies below. ), the code generator 9 generates 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.
When the "2" pushbutton switch of the numeric keypad 1 is then pressed, the process is similar to that described above.

Subsequently pressing the hidden switch 14 is equivalent to pressing the "8" pushbutton switch on the numeric keypad 1, and the comparator 4 receives BCD "8" as a comparison input.
” is input. On the other hand, the address counter 7 outputs the output terminal ■
The code generator 9 generates an output of BCD "8" based on the output signal from the comparator 4, and the comparator 4 detects that the comparison input and the compared input match and generates a high level output. Therefore, the output signal from address counter 7 and the output signal from comparator 4 both become high level, AND gate 16 generates an output, and flip-flop 17 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 unlock input signal matches a preset setting signal, and this becomes the crab lock signal. In addition, since the last digit "8" in the above is the hidden switch 14, the operator can memorize the 3-digit number and press the 4-digit sub-hidden switch 14.

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 can easily operate the hidden switch 14 by pressing the numeric keypad 1 with his right hand and operating the hidden switch 14 with his left hand, and the passenger can also read all the unlock codes. There is no fear of getting caught. 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, when an incorrect unlock input signal is applied, the comparator 4 does not generate a high level output, and only the press signal of the numeric key 1 from the OR gate 5 is input to the NAND gate 15, and the NAND gate 15 In order to generate a high level output and reset the address counter 7 through the OR gate 13, 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 all four digits are successively input with correct lock input signals. 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 multivibrator 1d is triggered. The output of the flip-flop 11c and the monostable multipipulator 11 are connected to the AND gate 11e.
Since the output of d is input, if the time interval between presses of the push pin switch of the numeric keypad 1 is longer than the set time of the monostable multipipelator 11d, the output of the monostable multipipetrator 11d When the set time elapses, the time setting circuit 11 generates an output, which is sent to the address counter 7 and penalty counter 8 through OR gates 12 and 13.
Reset. In addition, if the numeric key 1 is pressed 12 times in succession and there is no scale lock input signal that matches the transaction code during this period, the penalty counter 8
generates an output by pressing numeric key 1 on the 12th penalty,
In order to trigger the monostable multipipulator 10 and open the AND gate 6 during the output period of the monostable multipipulator 10, operate the numeric keypad 1 during the set time of the monostable multipipulator 10. However, that 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 emits 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 gates 12 and 13. Prepare for key operations.

Note that the flip-flop 17 is not affected by this reset and continues to send out a high level output. When the ignition switch 20 is turned on, both inputs of the AND gate 18 become high level, and the output of the AND gate 18 turns on the transistor 30, energizing the ignition relay 31 and starting the engine. Ignition takes place.

Furthermore, even if the numeric keypad 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, by turning off the ignition switch 20, both inputs of the AND gate 21 become 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 is output. The flip-flop 17 is set to IJ. Therefore, unless the electronic lock is locked 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. Now, with the engine stopped, the ignition switch 20 is turned off again, and then the ignition switch 20 is turned 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, by turning on the ignition switch 20, 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 output of this AND gate 23 is generated, 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. Incidentally, recently, a hydraulic pressure switch 24 has been installed to detect that the engine is rotating, so the hydraulic pressure switch can be used as described above, and there is no need to provide a new hydraulic switch. Furthermore, when the output from the output terminal Q of the flip-flop 17 is at a high level, when the "0" pushbutton switch on the numeric keypad is pressed, the AND gate 26 generates an output, and the monostable multipipulator 27 outputs an output from the AND gate. Triggered by the output of 26, the transistor 32 is turned on for a time set by the monostable multipipulator 27, energizing the bonnet solenoid 33 and allowing the bonnet to be opened manually.

As explained above, according to the electronic lock for automobiles of the present invention, when the load stops accidentally such as when the engine stalls, the unlocking signal continues to be sent for a certain period of time, so it can be re-locked by easy operation without having to operate the key again. It is something that can be activated.

[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, 7...Address counter, 8...・Penalty counter, 9...
...Code generator, 10, 27 and 11d...
・・Monostable multipipulator, 11 ・・・Time setting circuit, 14 ・・Hidden switch, 17 and 11
c...Flip-flop, 22...Delay circuit, 31
...Ignition relay, 33...Bonnet solenoid. Figure 2/X

Claims (1)

[Claims] 1. In an electronic automobile lock that allows the engine key to start the engine when a key operation on the numeric keypad that matches a preset multi-digit code is performed, the key operation using the numeric keypad is performed correctly. an AND gate that turns on the ignition relay when the output from the flip-flop and the ignition switch on output from the engine key are applied; It is composed of a hydraulic switch that detects a change in hydraulic pressure due to a stop and sends out an output, and a delay circuit that is reset to zero by the output from the hydraulic switch, starts a timer operation, and resets the flip-flop after the timer of the timer operation is up. An electronic lock for automobiles.