JPS61274059A - Door lock release signal generator in code input - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a door unlock signal generator based on code input.

(B) Conventional technology Conventionally, in a door unlock signal generator that outputs a door unlock signal by comparing a preset code and a code input by a key, the preset code is generated by a mechanical switch row. was. However, preset ciphers based on mechanical switch arrays are difficult to maintain secrecy because they can be read visually, and the preset cipher length is fixed, making it difficult to change the preset cipher length according to importance or preference. Ta. Furthermore, the method using a magnetic card involves the inconvenience of carrying the card and the risk of loss.

(c) Problems to be solved by the invention Therefore, the present invention maintains the secrecy of the preset cipher by storing the preset cipher for which a key is input as latent data in a semiconductor, and provides a preset cipher end signal and an cipher end signal. The purpose is to make it possible to arbitrarily select a preset cipher length.

(d) Means for Solving the Problems The present invention will be described below with reference to the drawings in an embodiment in which the invention is connected to an automobile door unlocking device.

FIG. 1 is an overall configuration diagram for clearly showing the configuration of the present invention. If two keys are used, three types of signals can be input to the microcomputer 4: when both keys I and 2 are pressed at the same time, when only key 1 is pressed, and when only key 2 is pressed. can. By storing this combination in a preset cipher storage means built into the microcomputer 4, the preset cipher is held as latent data. Also key from inputting the reset signal! By storing the inputs until the end of the preset when key 2 and key 2 are pressed at the same time as a series of preset ciphers, it is possible to make the preset cipher length variable. After the preset code is input, when the same key sequence as the preset code is input, the comparison means compares the preset code and the code, and the microcomputer 4 outputs a door unlock signal to the door unlock device 5. do. To change the preset cipher, press the reset switch 3.

The present invention will be described in detail below with reference to the drawings.

In FIG. 2, keys 1 and 2 are input keys to the microcomputer 4, and when the reset switch 3 is pressed, the address counter of the ROM built in the microcomputer 4 is brought to an initial state.

This ROM is used to store the program shown in FIG. The microcomputer 4 also includes a preset code storage unit Ml, a code storage unit M2, and a comparison unit C.
It has built-in MP, input/output means, timer means, etc.

When voltage is applied to the microcomputer 4 or when the reset switch 3 is pressed thereafter, as shown in the flowchart of FIG.
Then, the contents of the cipher storage means M2 are cleared, and the preset cipher EN is waited for to be input from the key I and the key 2. When the preset cipher EN is detected, the contents of Ml are shifted to the left by one word, and the detected input is stored at the right end.

Next, it is detected whether there is an EN input or whether the EN has ended. If there is no continuous input for 30 seconds, the preset code input will automatically end and code ID detection will start. The above sequence will not return unless it is reset. When the EN end signal is detected, the process moves to the coded ID detection program. The ID detection program takes the same sequence as the EN input, but holds the ID input in the encryption storage means M2 [D When the end signal is detected, the contents of M1 and the contents of M2 are compared.

FIG. 3 is an example of EN and ID input.

If EN and ID match, Figure 4 CMP BN: ID
YES is selected, a door unlock signal is output, and M2
Clears the contents of and waits for the next ID input.

If NO is selected, the contents of M2 are cleared and the next I
Wait for D input.

When a door lock release signal is output from the microcomputer 4, a voltage is applied to the solenoid of the door lock release device 5 shown in FIG. 2, and the door lock is released by electromagnetic force.

(E) Function: When the preset code EN matches the code ID input later, an output signal is output from the microcomputer 4, current flows through the solenoid of the door unlock device, and the electromagnetic force unlocks or unlocks the door. be done. If the preset code EN and code ID do not match, the door will not be unlocked.

(f) Effects of the Invention As explained above, the present invention secures confidentiality by retaining a preset cipher as latent data in a semiconductor storage means, and also provides an end signal for the preset cipher so that the length of the preset cipher can be set arbitrarily. There are effects that can be set to .

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram, Fig. 2 is a circuit diagram, Fig. 3 is an input waveform, and Fig. 4 is a flowchart. ... Reset switch 4 ... Microcomputer 5 ... Door lock release device 6 ... Battery

Claims (1)

[Claims] l a) Reset input means b) Key input means consisting of two keys used for preset cipher input, cipher input, preset cipher end input, and cipher end input; c) key input means for performing the above four types of inputs; means for determining d) semiconductor storage means for storing the preset cipher and the cipher; e) comparison means for comparing the contents of the preset cipher storage means with the contents of the cipher storage means; and an output means for outputting a signal to a solenoid driver.