KR100194059B1 - Gas valve automatic control method and device - Google Patents

Abstract

The present invention relates to a method and apparatus for automatically controlling a gas valve, which provides a self-diagnosis function of a gas detection unit and a gas valve to automatically close a thorn valve when an abnormality occurs or a gas leak, and a user's artificial gas valve. By detecting the lever operation of the gas detection unit, regardless of whether the gas valve motor control by controlling the gas supply to cut off quickly and accurately.

As described above, the present invention includes an initial valve position reading process of reading and setting an opening / closing position of a gas valve according to whether the gas detecting means is operated after initialization; A self-diagnosis process of resetting the operation time when there is no preliminary operation of the gas detecting means to search the state of the gas detecting means and the gas valve and to control the gas valve according to the searched state; On the basis of the current opening / closing position value set in the initial valve position reading process, the operation state of the lever and gas valve opening / closing key of the gas valve according to the user and whether the gas is leaked are detected. An opening and closing intention detection process of controlling opening and closing; A gas leak alarm generation process of closing the gas valve unconditionally and generating an alarm sound at regular time intervals when there is no intention of the user to open and close the gas valve when the gas intention is detected as a result of the detection of the opening and closing intention detection process; And an abnormal alarm generating process for generating an alarm sound at different time intervals when the abnormal state of the gas detecting means and the gas valve is generated as a result of the search in the self-diagnostic process.

Description

Gas valve automatic control method and device

1 is a block diagram of a conventional gas valve control device.

FIG. 2 is a circuit diagram showing in more detail the switching selector and gas valve driver of FIG.

Figure 3 is a configuration diagram of an embodiment of the automatic gas valve control device of the present invention.

FIG. 4 is a detailed circuit diagram showing a dynamic state of the gas valve state detector of FIG.

(a) is an explanatory view of the operation of the gas valve in the open state,

(b) is an explanatory view of the operation of the gas valve in the closed state,

(c) is an explanatory view of the operation when the gas valve is in a neutral state.

5 is a view showing in more detail the gas detector of FIG.

(A) to (e) of FIG. 6 are control signal flow charts of the gas valve according to FIG.

* Explanation of symbols for main parts of the drawings

200: gas detection unit 201: gas detection comparison unit

202: function selection unit 203: microprocessor

204: voltage delay supply unit 205: display unit

206: reset section 207: gas valve drive control unit

208: gas valve motor 209: alarm sound generating unit

210: limiter circuit portion 211: key operating portion

212 gas valve state detection unit

The present invention relates to the automatic control of the gas valve according to the gas (gas) leakage in the industrial or domestic gas valve, more specifically, the gas leakage detection gas sensor and the occurrence of abnormality by the current opening and closing position of the gas valve The present invention relates to a method and apparatus for automatically controlling a gas valve so as to control the gas valve quickly and accurately without malfunction.

In general, LPG or LNG and silver gas are recent essential energy sources that can be conveniently converted into thermal energy or electrical energy without pollution depending on industrial and home use, and drive mechanisms in industry. As electrical energy for the purpose, it has been used as a high-efficiency heat energy source in a cooking apparatus for cooking food such as a gas range.

As such, while gas has been used as a convenient energy source depending on the application, it is also a dangerous energy source that can cause enormous disasters and personal injury if leaked due to user's small carelessness or aging of gas pipe and uncoupling of gas pipe. Do.

Therefore, when the gas leaks due to aging of the gas pipe, carelessness of the user or uncoupling of the gas connection pipe, the gas leaks through the gas sensor in advance in order to prevent disaster and human injury in advance. Various types of gas valve controls have been developed and traded for closing the supply of gas by closing the valve.

FIG. 1 is a configuration diagram of a conventional gas valve control device, and FIG. 2 is a circuit diagram showing the switching selector and gas valve driving unit of FIG. 1 in more detail. As shown in FIG. The power supply unit 100 lowers the voltage to a predetermined level and changes the dropped AC voltage into a pulsating DC voltage through the bridge diodes D1-D4 and D5 and then outputs it smoothly through the capacitor C1. )Wow; The pulsed DC voltage provided from the power supply unit 100 is stabilized to a predetermined level through the resistor R1 and the zener diode ZD1 to output the system driving voltage, and the presence or absence of power is supplied to the first light emitting device LED1 and the resistor ( A power display and a constant voltage unit 101 which emit light through R2) and display the same to a user; Gas detection unit consisting of the first and second sensors (S1, S2) for detecting the leakage of gas such as LPG, LNG by the voltage supplied from the power display and the constant voltage unit 101 and outputs the corresponding electrical signal 102; A reference voltage generator comprising a resistor (R6, R7), a variable resistor (VR1) and a capacitor (C3) to generate a reference voltage by varying the voltage of the power display and the constant voltage unit 101 to the minimum voltage required for gas detection 103; A resistor (R3-R5), a capacitor (C2), and a comparator 104a which compare the reference voltage generated by the reference voltage generator 103 with the signal sensed by the gas detector 102 and output the resulting voltage. Gas detection comparison unit 104 made of; A diode which generates a reset signal for a predetermined time by the time constant of the resistor R8 and the capacitor C4 at the time of initially displaying the power supply and the power supply from the constant voltage unit 101, and then generating a reset release signal. A reset portion 105 including D6); The capacitor C5, the resistors R9 and R10 and the diode D7 delaying the result value compared by the gas detection comparator 104 for a predetermined time at the same time as the time constant of the reset unit 104. A time delay unit 106; Logically inverts the gas detection signal delayed by the time delay unit 106 and the reset release signal generated by the reset unit 105 through the first and second logical product inversion elements 107a and 107b. A gas valve driving control unit 107 outputting the gas valve control signal through the diode D8; When the gas leaks, the gas valve control signal inputted from the gas valve driving control unit 107 and the delay signal inputted by the delay and the level change for a predetermined time through the resistor R11 and the condenser C6 for the third logical product An alarm display unit including a resistor R12 for inverting the logical AND through the inverting device 108a and displaying the alarm by periodically flashing the second light emitting device LED2 through the resistor R13. 108; The signal input from the third logical product inversion device 108a of the alarm display unit 108 and the signal inputted by delay and level change during its time constant are periodically logically inverted and output as a control signal for buzzer driving. A buzzer driving control unit 109 consisting of a fourth logical inverting element 109a, a diode D9, a resistor R14, and a capacitor C7; The diode D10, the transistor TR1, and the buzzer periodically operating according to the buzzer driving control signal and the gas valve driving control signal input from the buzzer driving control unit 109 and the gas valve driving control unit 107 to generate an alarm sound. An alarm sound generating unit 110 consisting of 110a; The gas valve driving control signal from the gas valve driving control unit 107 and the gas valve opening / closing signal by the user's switch 11 selection switching are input to the first and second flip-flops 112a and 112b. The switching selector 112 is configured to selectively switch the transistors TR2 to TR5 of the gas valve driving unit 113 to forward and reverse rotation of the gas valve motor 114.

In addition, the switch 111, which the user selects and operates to artificially open and close the gas valve, is installed close to the installation place of the gas detection unit 102.

In the conventional gas valve control device configured as described above, when the power switch is turned on, the use AC power at 60 Hz is dropped to a predetermined level through the transformer 100a of the power supply unit 100, and the dropped AC voltage is 4 After converting into a pulsating DC voltage through the two bridge diodes (D1-D4) and smoothed through the capacitor (C1), the power is supplied to the user by emitting the first light emitting device (LED1) of the power display and the constant voltage unit 101 The displayed voltage is input to the alarm sound generating unit 110 and the smoothed voltage is converted into a constant level constant voltage by the zener voltages of the resistor R1 and the zener diode ZD1 to be described later. 108, the reset part 105, and the gas valve drive part 113 are supplied.

The reset unit 105 resets the constant voltage VDD at a predetermined level by the time constant value of the resistor R8 and the capacitor C4 for a predetermined time, i.e., a low voltage input from the power display and the constant voltage unit 101. The potential is generated and input to one input terminal of the first logical-reverse element 107a of the gas valve driving control unit 107 which will be described in detail later. After a predetermined time, the reset release signal, that is, the high potential, is continuously Will be entered.

On the other hand, the gas valve driving control unit 107 is the first and second logical product inverting element to the intersection of the resultant signal input from the gas detection comparison unit 104 and the reset unit 105 when the gas does not leak Logically inverting through (107a) and (107b) outputs a logical low signal to the alarm sound generating unit 110 and the alarm display unit 108 and the low signal output from the gas valve driving control unit 107 is a diode ( By rotating the gas valve motor 114 counterclockwise through D8), the switching selector 112, and the gas valve driving unit 113, a gas valve (not shown) is opened to continuously supply gas.

In addition, the alarm sound generating unit 11 and the alarm display unit 108 does not display the alarm sound and the alarm display due to a low signal output from the gas valve driving control unit 107, that is, a low potential, when gas is not leaked. .

In this state, if the gas leaks due to aging of the gas pipe, carelessness of the user or uncoupling of the gas pipe, the first and second sensors S1 and S2 of the gas detecting unit 102 detect the leaked gas. The electrical signal is detected and input to the non-inverting terminal (+) of the comparator 104a through the resistor R4 and the condenser C2 of the gas sensing comparator 104.

In addition, the inverting terminal (-) of the comparator 104a receives a voltage input through the power supply terminal VDD, and includes the resistors R6 and R7 of the reference voltage generator 103, the variable resistor VR1, and the capacitor C3. Variable reference voltage is input.

Accordingly, the comparator 104a compares the reference voltage input from the reference voltage generator 103 with the electrical signal detected by the gas detector 102 and inputs a high reference voltage, that is, no gas leakage. In this case, a low signal is output logically, and when the reference voltage is low, that is, when the electrical signal corresponding to the gas detection is high in the gas detection unit 102, there is a gas leakage. It is input to the unit 106.

The time delay unit 106 includes resistors R9 and R10, a diode D7, and a capacitor C5.

The resistance R10 and the condenser C5 of the time delay unit 106 are set equal to the time constant values of the resistor R8 and the condenser C4 of the reset unit 105 so that the low potential is initially maintained for a predetermined time. After a predetermined time, the high signal is inputted to the other axis input terminal of the first logical-inverting element 107a of the gas valve driving control unit 107.

The first logical product inverting element 107a of the gas valve driving control unit 107 logically inverts the high signal input from the time delay unit 106 and the high signal of the reset unit 105 when the gas leaks. Will output a signal.

The low signal (low potential) output from the first logical inverting element 107a is inverted to a high signal through the second logical inverting element 107b to the alarm display unit 108 and the alarm sound generating unit 110. In addition to the input, it is input to the switching selector 112 through the diode D8.

The switching selector 112 turns on / off the transistors TR2-TR5 of the gas valve driver 113 according to the gas valve driving control signal input from the gas valve driving controller 107 and the selection switching of the switch 111. First and second flip-flops 112a and 112b for selectively controlling the off.

Accordingly, the first flip-flop 112a of the switching selector 112 receives a logical high signal (interpotential) output from the second logical inverting element 107n of the gas valve driving control unit 107 when the gas leaks. Input and his output terminal ( Q) outputs low and high potentials, respectively, to conduct transistors TR2 and TR4 of the gas valve driving unit 113, and the second flip-flop 112b is the same as the first flip-flop 112a. A high potential output from the second logical product inverting element 107b of the driving controller 107 is received and its output terminal ( Q) outputs a low potential and a high potential, respectively, to cut off the transistors TR3 and TR5 of the gas valve driver 113.

Accordingly, the constant voltage VDD supplied from the power display and the constant voltage unit 101 is grounded through the transistor TR2 of the conductive gas valve driver 113 and grounded through the gas valve motor 114 and the transistor TR4. By bypassing the gas valve motor 114 is rotated in a clockwise direction to close the gas valve.

On the other hand, the alarm display unit 108 generates a pulse of a predetermined period by logically inverting the input signal fed back by the intersection potential and its time constant value output from the gas valve driving control unit 107 during gas leakage. The light emitting element LED2 blinks at a constant cycle to alert the gas leakage.

That is, in other words, the third logical inverting element 108a of the alarm display unit 108 charges its own capacitor C6 at a high potential and initially inputted from the second logical inverting element 107b at the time of gas leakage. The low potential is output by logically inverting the high potential and the low potential is again charged and discharged with the time constant values of the resistor R11 and the capacitor C6 to perform input / discharge on the other input terminal of the third logical inversion device 108a. By inputting to the output terminal, a pulse of a certain period is generated at its output terminal to periodically blink the second light emitting element LED2 through the resistor R13.

In addition, the buzzer driving unit 109 is fixed high voltage input through the resistor R12 from the second logical product inversion element 107b of the gas valve driving control unit 107 at the time of gas leakage in the same way as the alarm display unit 108 The low-to-high potential, the high-potential to the low potential are periodically converted from the low and high potentials by the constant time constants of the upper and own resistances R14 and the capacitor C7, and are then logically multiplied by the fourth logical inverting element 109a. By inverting the transistor TR1 of the alarm sound generator 110 on / off periodically, the buzzer 110a is periodically driven to generate an alarm sound.

The diode D9 of the buzzer driver 109 prevents the high voltage through the second light emitting device LED2 of the alarm display 108 from being reverse biased to the input of the fourth logical inverting device 109a. It is for.

On the other hand, when there is no leakage of gas or when the user opens or closes the gas valve as needed, or when the user wants to close the gas valve forcibly in a state where the gas is detected before the gas detection of the gas detection unit 102. In the switch 111 is located close to the installation place, such as gas detection unit 102 to enable the artificial opening and closing.

That is, when the user wants to open the gas valve, the user finds the installation place of the switch 111, selects the switch 111 to the ground terminal side, and switches the ground potential of the switching selector 112. It is input to the 1st, 2nd flip-flops 112a and 112b.

As described above, when the ground potential is input through the switch 111, the first flip-flop 112a has its output terminal ( Q) outputs a high potential and a low potential, respectively, to cut off the transistors TR2 and TR4 of the gas valve driving unit 113, and the second flip-flop 112b switches 111 in the same manner as the first flip-flop 112a. Receives the ground potential through the output terminal Q) outputs a high potential and a low potential, respectively, to conduct the transistors TR3 and TR5 of the gas valve driver 113.

Accordingly, the constant voltage VDD supplied from the power display and the constant voltage unit 101 is grounded through the transistor TR3 of the conductive gas valve driver 113 and grounded through the gas valve motor 114 and the transistor TR5. By bypassing the gas valve motor 114 is rotated counterclockwise to open the gas valve.

In addition, when the user wants to close the gas valve artificially by checking before the gas detection of the gas detecting unit 102 in an emergency situation in which gas leaks, the switch 111 is connected to the constant voltage (VDD) terminal as described above. When switching to the side, the first and second flip-flops 112a and 112b of the switching selector 112 receive the constant voltage VDD through the switch 111 and its output terminal ( Q) outputs a low potential and a high potential to shut off the conduction of the transistors TR2 and TR4 and the transistors TR3 and TR5 to close the gas valve while the gas valve motor 114 rotates clockwise.

However, in the conventional gas valve control apparatus, the installation position of the gas sensing unit and the installation position of the switch for artificially opening and closing the gas valve are changed according to the type of gas.

That is, in order to detect gas that is heavier than air, such as LPG, the gas detection unit must be generally installed on the floor, and in order to detect gas lighter than air, such as LNG, it must be installed on the ceiling.

In addition, before the gas alarm is detected, the user cannot directly close and close the lever of the gas valve, and only finds and closes the switch located in the gas detecting unit.

This is because the gas valve motor is driven only by the operation of a switch or an alarm input by gas leakage.

That is, even if the user operates the lever of the gas valve to close the gas valve by checking for gas leakage before the gas alarm is detected, the gas valve motor is driven only by the gas detector, so the user's lever is not detected. It was not possible to close the gas valve by operation, only by switch operation. In addition, there is no self-diagnostic function of the gas detection unit and self-diagnosis function of the gas valve motor, so that the gas alarm sounds or the gas valve is locked even when the gas detection unit and the gas valve motor are defective and no gas is leaked. It caused anxiety, and on the contrary, there was a problem in that the circuit could not be detected in an emergency situation in which gas was leaked or caused a fatal human accident due to a gas valve defect, as well as a complicated problem.

Accordingly, an object of the present invention is to give a self-diagnostic function of the gas sensor and gas valve for detecting gas leakage in consideration of the problems of the prior art as described above, and to give the user an alarm and display at different times when an abnormality occurs. It is a first object of the present invention to provide a method and apparatus for automatically controlling a gas valve so that the gas sensor or the gas valve can be recognized in advance.

The second object of the present invention is to automatically control the gas valve so that the gas valve is detected and displayed at a different time from the alarm of the gas sensor and the gas valve when there is a gas leak without malfunction, and the gas valve is shut off accurately and quickly. It is to provide a method and apparatus.

The third object of the present invention is to detect the artificial gas valve lever operation of the user in case of an emergency caused by the gas leak prior to the gas leak detection of the gas sensor to supply the gas to the control of the gas valve motor regardless of whether the gas sensor is detected. It is to provide a gas valve automatic control method and apparatus to shut off.

The fourth object of the present invention is to provide the convenience of gas valve opening and closing operation by quickly and precisely controlling the opening and closing of the gas valve automatically by detecting the opening and closing of the gas valve of the user without the operation of the opening and closing switch in the normal state of the device It is to provide a gas valve automatic control method and apparatus.

It is a fifth object of the present invention to provide a gas valve automatic control method and apparatus for simplifying a circuit to contribute to productivity improvement.

Automatic gas valve control method of the present invention for achieving the above object is determined by the operation of the gas detection means within the set operating time after the system initialization and detecting the setting of the open and close position of the gas valve according to the operation of the gas detection means An initial valve position reading process; A self-diagnosis process of resetting the operation time when there is no operation of the gas detection means within the set operation time, searching for the state of the gas detection means and the gas valve, and continuously controlling the gas valve according to the retrieved state; On the basis of the current opening and closing position value set in the initial valve position reading process, the operation state of the gas valve lever and the gas valve opening and closing key according to the user and whether the gas is leaked are detected and the gas valve is opened and closed according to the detected result. Opening and closing intention detection process for controlling the; A gas leakage alarm generating process of closing the gas valve unconditionally and generating an alarm sound at a predetermined time interval when there is no intention of opening and closing of the user and detecting leakage of gas as a result of the detection of the opening and closing intention detection process; And an abnormal alarm generating process for generating an alarm sound with a different time difference when an abnormal state of the gas detecting means and the gas valve is detected as a result of the search in the self-diagnostic process.

The initial valve position reading process may include a first step of setting an operation time of the gas detecting means after initializing the system; A second step of searching for operation of the gas detecting means during the operation time; A third step of reading the position of the gas valve if there is an operation of the gas detecting means within the set operation time; Setting an open state if the read result is an open state; A fifth step of setting a closed state if the result of the reading in the third step is a closed state; As a result of the reading, if the opening and closing position is in a neutral state, characterized in that the sixth step of controlling and closing the gas valve.

In the self-diagnosis process, if the gas detecting means does not operate within a set operation time, a seventh step of operating by resetting the operation time; An eighth step of searching for an error of the gas detecting means and the gas valve; If there is no occurrence of the error is characterized in that the ninth step of controlling the gas valve motor to control the opening and closing of the gas valve.

The opening and closing intention detection process may include: a tenth step of retrieving whether a gas valve closing and opening key is input by a user based on a value set in the initial valve position reading process; An eleventh step of opening and closing the gas valve according to a selected position when the gas valve is closed or opened as a result of the search; A twelfth step of searching whether there is a lever operation of the gas valve by a user when there is no closing or opening key as a result of the searching; A thirteenth step of controlling and returning the opening and closing of the gas valve according to the operation of the lever, if there is a lever operation as a result of the searching; If there is no lever operation of the gas valve through the gas detection means to detect whether there is a gas leak, if there is no leak, the self-diagnosis process, and if there is a leak is characterized in that the 14th step of returning to the gas leakage alarm generating process .

In the gas leakage alarm generating process, when a gas leak occurs in the opening / closing intention detection process, the gas valve is closed through a gas valve driving control means, and an alarm sound is generated at a predetermined time interval until an alarm end key is input. A fifteenth step; When the alarm end key is input, the alarm is terminated, and if the gas is detected through the gas detection means, it is characterized in that it comprises the 16th step of returning to the self-diagnosis process if the step 15 is not repeated.

The abnormality alarm generation step may include: a seventeenth step of generating an alarm sound until an alarm end key is input at a different time difference when there is an error in the gas detection means or the gas valve during the initial valve position reading process; When the alarm end key is input, it is characterized in that the eighteenth step of terminating the alarm and fed back to the self-diagnosis process.

In addition, the automatic gas valve control apparatus for achieving the object of the present invention and the gas detection means for detecting the gas leakage by the resistance value change; Gas detection comparing means for comparing the low pressure sensed by the gas detecting means with a reference voltage and outputting a resultant voltage; Gas valve state detection means built in a gas valve motor for controlling the opening and closing of the gas valve and detecting an open / closed switch of the gas valve and an error state; A limiter circuit portion for limiting the voltage detected by the gas valve state detecting means to a predetermined level; Key operation means for selectively setting the opening and closing of the gas valve and whether or not an alarm is generated by a user; With the presence or absence of gas leakage according to the result voltage of the gas detection means and the gas detection comparison means and the low pressure supplied from the limiter circuit part, the opening and closing positions and the error state of the gas valve are periodically read and the gas is read according to the read result. Generates open / close control signal, alarm generation control signal, valve error check signal, open / close check signal, generates alarm termination and open / close control signal of gas valve according to key operation of key operation means A microprocessor for controlling the operation; And a gas valve driving control means for rotating the gas valve motor forward and reverse according to the gas valve opening / closing control signal obtained by the microprocessor and transferring the error signal and the opening / closing position signal detected by the gas valve state detecting means to the microprocessor. It is done.

Hereinafter, described in detail with reference to the accompanying drawings of the present invention.

3 is a configuration diagram of an automatic gas valve automatic control device according to an embodiment of the present invention, and FIG. 4 is a detailed circuit diagram illustrating an operation state of the gas valve state detection unit of FIG. 3, and as shown therein, a power supply unit (not shown in the drawing). Is composed of diode (D1), resistor (R1) and zener diode (ZD1) for receiving a DC voltage supplied from A constant voltage unit 213; A gas detector 200 which detects a gas leak by converting a voltage supplied from the constant voltage unit 213 according to a change in resistance values of the first and second gas sensors K1 and K2 according to the presence or absence of gas leakage; A reference voltage setting unit 214 for setting a reference voltage by varying the constant voltage supplied from the constant voltage unit 213 to a minimum voltage necessary for gas detection by the resistors R1 and R2 and the variable resistor VR1; The resistors R4 and R5 and the capacitor C2 comparing the reference voltage set by the reference voltage setting unit 214 with the output voltage change according to the presence or absence of gas detection from the gas sensing unit 200 and outputting the resulting voltage. And a gas sensing comparator 201 including a comparator 201a; Resistor (R12, R13) and transistor for generating a reset signal for a predetermined time by the time constant of capacitor C3 and resistor R11 at the time of power input from the power supply unit initially, and then generating a reset release signal. A reset unit 206 including TR1; Bypass the voltage supplied from the power supply through the second power terminal (VCC) by a predetermined time delay through the capacitor (C2) or another voltage input through the first power terminal (VCC1). A voltage delay supply unit 204 for supplying to the operating voltage by down to a predetermined level through D2 and delaying a predetermined time through the capacitor C2; A key operation unit 211 for artificially inputting the gas alarm termination and the opening and closing of the gas valve by a user; First, which allows the user to set the type of use of the gas sensor (K1, K2) of the gas detection unit 200, the setting of the LPG or LNG type, and whether the other alarm and the gas valve control device is separated or integrated. A function selector 202 formed of second dip switches 202a and 202b; A gas valve state detection unit 212 coupled to the gas valve motor 208 and periodically detecting an open / close position and an error state of the current gas valve according to a valve error check signal and a valve opening / closing check signal input from the outside; A limiter circuit unit 210 including zener diodes ZD2 and ZD3 and resistors R14 and R15 for limiting and outputting the open / close position voltage and the error state voltage detected by the gas valve state detection unit 212 to a predetermined level; The operation of the voltage delay supply unit 204 and the reset release signal supplied from the reset unit 206 operate by the error detection of the gas detection unit 200 and the detection of the gas detection unit 201. With the result of the gas leakage according to the resultant voltage and the voltage supplied from the limiter circuit unit 210 and periodically reading the valve opening and closing position and whether the valve error, and according to the reading result of the gas valve opening and closing stir signal and alarm control signal and valve The microprocessor 203 generates an error check signal and a valve open / close check signal, and generates an alarm termination signal and an open / close control signal of the gas valve according to the key operation of the key operation unit 211 to control the entire operation of the series gas valve control device. Wow; The gas valve motor 208 is rotated forward and backward according to the gas valve opening control signal, the valve error check signal, and the valve opening / closing check signal provided by the microprocessor 203, and the error detected by the gas valve state detection unit 212 is detected. A gas valve driving control unit 207 for transmitting a signal and an opening / closing position signal to the microprocessor 203 through the limiter circuit unit 21; The display unit includes a resistor (R8-R10) is provided by the microprocessor 203 to display the opening and closing state and the power supply state according to the control signal through the first to third light emitting elements (LED1 to LED3) ( 205); Alarm sound generation including a diode D3 for periodically switching the transistor TR2 according to the alarm generation control signal provided from the microprocessor 203 and generating an alarm sound through the coil L1 and the speaker 209a. Section 209; The oscillator 215 is configured to provide an oscillation frequency to the microprocessor 203.

In the above, the gas valve driving control unit 207 conducts the transistors TR3, TR5, TR8 in response to the closing control signal supplied from the microprocessor 203 to rotate the gas valve motor 208 clockwise ( A forward driver including R16, R18, and R19) and a reverse bias preventing diode D4; In response to the opening control signal supplied from the microprocessor 203, the transistors TR4, TR6, and TR7 conduct the resistors R17, R20, and R21 to counterclockwise rotation of the gas valve motor 208. A reverse driver including a diode D5; A resistance for providing a valve error check signal and a valve opening / closing check signal provided from the microprocessor 203 to the gas valve state detection unit 212 to provide the error circuit and the open / close position signal fed back therefrom to the limiter circuit 21. It consists of (R22, R23).

In the above, the gas valve state detection unit 212 is connected to both terminals (M1, M2) of the gas valve motor 208, as shown in FIG. Diodes D6 and D7 for supplying an error check signal to the gas valve motor 208; The diodes D6 and D7 are connected in parallel to each other and switched to a contact according to the rotational position of the gas valve to supply or shut off the open / close check signal and the error check signal provided from the microprocessor 203 to the gas valve motor 208. Or the first and second switches SW1 and SW2 for supplying or blocking the opening / closing position signal and the error signal through the gas valve motor 208 to the microprocessor 203.

6 (a) to 6 (e) are control signal flow charts of the gas valve according to FIG. 3, and as shown therein, it is determined whether the gas detecting unit 200 operates within the set operating time after system initialization. An initial valve position reading process (ST100) for detecting and setting the opening / closing position of the gas valve through the gas valve state detecting unit 212 according to the operation of the gas detecting unit 200; When there is no operation of the gas detection unit 200 within the set operation time, the initialization value of the operation time is reset to search the state of the gas detection unit 200 and the gas valve, and according to the retrieved state, the gas valve driving control unit ( A self-diagnosis process (ST101) for normally controlling the gas valve or generating an abnormal alarm through 207; On the basis of the opening / closing position value of the current gas valve set in the initial valve position reading process (ST100), the operation of the lever and the key control unit 211 of the gas valve according to the user and whether the gas leak of the gas detecting unit 200 An opening and closing intention detection process (ST102) for detecting opening and closing of the gas valve through the gas valve driving control unit 207 according to the detected result; Gas leakage alarm that closes the gas valve without any condition and generates an alarm sound at a predetermined time interval (t1) when only the gas leakage is detected without the user's intention to open and close the detection result in the ST102 process. Generation process (ST103); An abnormal alarm generating process (ST104) for generating an alarm sound at a time difference t2 and t3 when an abnormal state of the gas detecting unit 200 and the gas valve occurs as a result of the search in the self-diagnostic process ST101; Is done.

In the initial valve position reading process (ST100), after initializing the system (ST1), setting an initial value of an operation time of the gas detecting unit 200 (ST2); Searching whether the gas detecting unit 200 is operated during the operation time (ST3); Reading the position of the gas valve through the gas valve state detecting unit 212 when the gas detecting unit 200 is operated within the set operating time (ST4); Setting the open state (ST6, ST9) if the gas valve is in the open state as a result of the reading; Setting the closed state (ST6, ST7) if the gas valve is in the closed state as a result of reading in the step ST4; If the opening / closing position is not closed and opened as a result of reading in step ST4, it is determined that the current opening / closing position of the gas valve is in the neutral position, and closes the gas valve through the gas valve driving control unit 207 and returns to normal routine. Step ST8 is performed.

In addition, in the self-diagnosis process ST101, if the initialization delay time set in the initial valve position reading process ST100 has not elapsed, it is determined that the gas detection unit 200 does not perform the initial operation, and resets the initial value and detects the gas. As a main routine for diagnosing abnormality of the unit 200 and the gas valve, generating a timing by resetting an initialization value of an operation time when the gas detection unit 200 does not operate within a set operation time. (ST10, ST11); Controlling the external key operation unit 211 or the gas detecting unit 200 and the gas valve state detecting unit 212 after receiving the initial value operation time and receiving a signal therefrom (ST12); Searching whether an error occurs in the gas detecting unit 200 and the gas valve using the input signal (ST13, ST14); If the error in the gas detection unit 200 or the gas valve does not occur as a result of the search in steps ST13 and ST14, the gas valve motor 208 is controlled through the gas valve driving control unit 207 to open and close the gas valve. And returning (ST15-ST17).

In addition, the opening and closing intention detection process (ST102) is a normal routine for automatically controlling the opening and closing of the gas valve by detecting it when the user wants to open and close the gas valve by an arbitrary operation, and after initializing the normal routine (ST18) Retrieving whether the gas valve closing and opening key of the user is input through the key operation unit 211 based on the value set in the valve position reading process (ST100) (ST19, ST23); Closing and returning the gas valve through the gas valve driving control unit 207 and the gas valve motor 208 when the closing key of the gas valve is input as a result of the search (ST20 to ST22); Opening and returning the gas valve through the gas valve driving control unit 208 and the gas valve motor 208 when the opening key of the gas valve is input (ST24 to ST26); Searching for a closed or open operation by the gas valve lever if there is no input of the closing and opening keys of the key operation unit 211 (ST27); Controlling and returning the opening / closing of the gas valve in accordance with the operation position of the lever if there is a lever operation (ST28, ST30, ST31); If there is no lever operation of the gas valve, searching whether there is a gas leak through the gas detecting unit 200 (ST32); If there is no gas leakage as a result of the search, returning to the self-diagnosis process (ST101) to perform a main routine (ST33); If there is a gas leak as a result of the search, it is made to return to the gas leakage alarm generation process (ST103) to perform the abnormal routine (ST34).

The gas leakage alarm generating process (ST103) is an abnormal routine for generating an alarm display and an alarm sound only when gas is leaked, and when a gas leak occurs in the opening and closing intention detecting process (ST102). After the initialization is released (ST34) closing the gas valve through the gas valve driving control unit 207 and generating an alarm sound at a predetermined time (t1) interval until the alarm end key is input through the key operation unit 211 (ST35, ST36); When the alarm end key is input (ST37), the alarm sound generation ends and the gas detection unit 200 searches whether there is a gas leak. If the alarm end key is detected, the process after the step ST34 is not repeated. ) To perform the main routine by returning to ().

The abnormal alarm generating process ST104 is an error routine for self-diagnosing abnormality of the gas detecting unit 200 and the gas valve in the self-diagnostic process ST101 and generating an alarm according to the result. After (ST41) if there is an error in the gas detecting unit 200 or the gas valve, it returns until the alarm end key is input at different time intervals (t2 and t3) according to the corresponding error (ST48) to generate an alarm sound. Steps ST42-ST45; When the alarm end key is input (ST46), the alarm is terminated, and the process returns to the self-diagnosis process ST101 to perform main routines (ST47 and ST48).

Thus, when described in detail with reference to Figure 3 to Figure 6 the effect of the present invention made as follows.

First, through the first dip switch 202a of the function selection unit 202, it sets what kind of sensor the gas sensors K1 and K2 of the current gas detection unit 200 are, and sets the second dip switch 202b. 6V voltage from the power supply unit after setting the type of LPG or LNG gas and whether the present invention uses the gas valve control device in combination with the current gas alarm, or the gas valve control device alone. When a voltage of 5V is selected and supplied, the voltage delay supply unit 204 delays the voltage 5V selected and input through the second power supply terminal Vcc through the capacitor C2 for a predetermined time and will be described later. If the voltage is directly supplied to the operating voltage of 203 or the voltage of 6V is selectively input through the first power terminal vcc1, the voltage is decreased by 0.7V from the diode D2 to the microprocessor 203 through the capacitor C2. To the operating voltage It becomes.

The reset unit 206 has a voltage 5V of a predetermined level input through the second power supply terminal Vcc from the power supply unit and has a transistor (C3) and a transistor (R11) during the time constant of the resistor (R11). TR1) is turned on to generate a reset signal, that is, a low potential, and after a time constant elapses, the transistor TR1 is cut off to generate a reset release signal, that is, a high potential, to be provided to the reset terminal of the microprocessor 203. .

In addition, the constant voltage unit 213 receives a voltage 6V input from the power supply unit through the first power terminal Vcc1 through a diode D1, a resistor R3, and a zener diode ZD1. To be provided to the gas detecting unit 200 and the reference voltage setting unit 214.

On the other hand, when the microprocessor 203 is operated by the operating voltage supplied from the voltage delay supply unit 204 and the reset signal from the reset unit 206 is supplied, the initial valve position as shown in FIG. The system is initialized through the reading process ST100 (step ST1).

Thereafter, the microprocessor 203 emits the first light emitting device LED1 of the display unit 205 through its output port P10 to indicate that the voltage from the voltage delay supply unit 204 is normally supplied. In addition, an initialization delay time of the gas detection unit 200 is set (step ST2), and the progress of the delay time is searched (step ST3).

If the initialization delay time has not elapsed as a result of searching through the step ST3, the gas detection unit 200 determines that the initial operation has not been performed, and thus the gas detection through the main routine of the self-diagnosis process ST101 to be described later. Self-diagnosis of the abnormality of the unit 200 and the gas valve, and when the set initialization delay time elapses, it is determined that the gas detection unit 200 is performing the initial operation, and the gas valve position detection unit 212 determines the position of the gas valve. To be read (step ST4).

That is, when the gas valve position reading in detail described with reference to Figure 4 as follows.

First, as shown in (a) of FIG. 4, when the gas valve is in an open state, that is, when the gas valve is open, the gas valve state detection unit 212 built in the gas valve motor 208 is opened by the rotation of the visible valve. The first switch SW1 is in an open state, and the second switch SW2 is in a short state.

When the gas valve is in the closed state, the first switch SW1 of the gas valve state detection unit 212 built in the gas valve motor 208 is placed in a short circuit state as shown in FIG. And the second switch SW2 is opened.

In addition, when the gas valve is in the neutral position of the opening and closing, the first and second switches SW1 and SW2 of the gas valve state detection unit 212 are placed in a short circuit state.

Therefore, the microprocessor 203 first outputs a low potential to its output port P16 and a high potential to the output port P17 in order to determine the open position of the gas valve as shown in FIG. The transistor TR3 is configured to conduct the transistor TR3 configured in the forward driver of the gas valve driver control unit 207 and to block the transistor TR4 configured in the reverse driver.

At this time, of course, the two transistors TR7 and TR8 of the gas valve driving control unit 207 are blocked by the low potential output from the output ports P14 and P15 of the microprocessor 203.

When the transistor TR3 of the forward driver is turned on, the motor bulb voltage input through the third power terminal VDD from the power supply is bypassed to the ground through the resistors R18 and R19 and the transistor TR3. The rear transistor TR5 is turned on to provide the motor driving voltage of the third power supply terminal VDD to the terminal M1 of the gas valve motor 208.

The motor driving voltage provided to the terminal M1 of the gas valve motor 208 is in a state in which the first switch SW1 of the gas valve state detection unit 212 described above is in a developed state when the gas valve is open. The terminal M2 of the gas valve motor 208 is caught through the coil of the forward diode D6 and the gas valve motor 208 and the shorted second switch SW2 without passing through the first switch SW1.

The motor driving voltage applied to the terminal M2 of the gas valve motor 208 is limited to a predetermined level (5V) by the zener voltage of the zener diode ZD3 of the limiter circuit unit 210 through the resistor R23. The input port P19 of the processor 203 is provided.

Therefore, the microprocessor 203 checks its input port P19 and determines that the open / close position of the current gas valve is in the open state when the voltage 5V of a predetermined level is input (step ST5). (Step ST9).

Then, as shown in FIG. 4 (b), in order to determine the closed state of the gas valve, the low potential is output to the output port P17 and the high potential is output to the output port P16 by the method described above. The transistor TR4 of the valve drive control unit 207 is turned on and the transistor TR3 is shut off.

When the transistor TR4 is turned on, the motor driving voltage input from the power supply unit through the third power supply terminal VDD is bypassed to the ground through the resistors R20 and R21 and the transistor TR4, so that the transistor TR6 is turned on. Is applied to provide the motor driving voltage of the third power terminal VDD to the terminal M2 of the gas valve motor 208.

The motor driving voltage provided to the terminal M2 of the gas valve motor 208 is in the state in which the second switch SW2 of the gas valve state detection unit 212 is opened in the state in which the gas valve is closed. The terminal M1 of the gas valve motor 208 is caught through the coil of the forward diode D7 and the gas valve motor 208 and the shorted first switch SW1 without passing through the second switch SW2.

The motor driving voltage applied to the terminal M1 of the gas valve motor 208 is limited to a predetermined level (5V) by the zener voltage of the zener diode ZD2 of the limiter circuit portion 21 through the resistor R22 and is microscopic. The input port P20 of the processor 203 is provided.

Accordingly, when the microprocessor 203 checks its input port P20 and the voltage 5V is input at a predetermined level, the microprocessor 203 determines that the current opening / closing position of the gas valve is in the closed state as shown in FIG. (Step ST6) to set the closed state (step ST7).

When the gas valve is placed in an intermediate position that is neither a closed nor an open state, as shown in FIG. 4C, the first and second switches SW1 and SW2 are short-circuited. When the low potential is periodically output through the output ports P16 and P17, and the input ports P19 and P20 are periodically searched and the voltage of a predetermined level is periodically input, the opening and closing position of the gas valve is shown in FIG. In the neutral position, the transistors TR3, TR5, and TR8 configured in the forward drive of the gas valve drive control unit 207 are turned on.

When the transistors TR3, TR5, and TR8 are turned on, the motor driving voltage of the third power supply terminal VDD is bypassed to the ground through the transistor TR5, the gas valve motor 208, and the transistor TR8. The gas valve motor 208 rotates clockwise to close the gas valve (step ST8).

In this way, when the opening and closing position of the gas valve is read and set, the microprocessor 203 performs the normal routine of the opening and closing intention detection process ST102 which will be described later.

In the above-described self-diagnosis process ST101, if the initial delay time set in the initial valve position reading process ST100 has not elapsed, it is determined that the gas detection unit 200 has not performed an initial operation (preheating). The main routine process for resetting and periodically and repeatedly self-diagnosis whether the gas detection unit 200 and the gas valve abnormality.

Therefore, when the initialization delay time has not elapsed in the initial valve position reading process ST100, the microprocessor 203 resets the initialization value (step ST10) and generates a timing (step ST11) to detect the gas. It will control the initial operation of.

In such a state, when an opening / closing key of the gas valve is input through the external key operating unit 211 or there is a system input (step ST12), that is, the system input includes the gas detecting unit 200 and the gas valve state detecting unit 212. Refers to the detected signal from).

If the system input is present, the microprocessor 203 searches for an error in the gas detecting unit 200 through its input port P7 (step ST13).

In other words, the error detection of the gas detection unit 200 is performed by the microprocessor 203 when the first and second gas sensors K1 and K2 of the gas detection unit 200 are normal as shown in FIG. 5. The constant voltage of a predetermined level supplied from the constant voltage unit 213 is induced in the input port P7.

However, when the first gas sensor K1 of the gas detecting unit 200 is disconnected, a voltage of 0 V is induced at the input port P7 of the microprocessor 203, and conversely, the first gas sensor K1 is When the second gas sensor K2 is normal and disconnected, a voltage of a level similar to a constant voltage supplied from the constant voltage unit 213 is induced in the input port P7 of the microprocessor 203.

As such, when the error is detected by detecting whether an error occurs in the gas detecting unit 200 with the difference of the voltage input through the input port P7, an abnormal alarm generating process as shown in FIG. After performing the error routine of ST104 and searching in step ST13, if the gas detecting unit 200 is normal, the above-described gas valve state detection unit 212 detects whether or not an error occurs in the gas valve. ; ST14).

That is, the error detection of the gas valve generates a low potential to any one of the output ports P16 and P17 in a state in which the first and second switches SW1 and SW2 are shorted, as shown in (c) of FIG. If a voltage of 0V is input to any one of the input ports P20 and P19, it is judged as a cue of the gas valve to perform the error routine of the abnormal alarm generation process (ST104). Will be judged.

When the gas valve is normally determined in the step ST14, the gas valve driving control unit 207 is selected by the gas valve opening / closing key signal selected from the key operating unit 211 or the result signal compared by the gas detecting unit 200. The gas valve motor 208 is controlled (step ST15) to open or close the gas valve and repeat the above process (step ST17).

On the other hand, the opening and closing intention detection process (ST102) is, as shown in (c) of FIG. 6, after setting the opening and closing position of the gas valve in the initial valve position reading process (ST100) of the gas before the gas detection unit 200 As a normal routine for controlling the opening and closing of the gas valve by automatically detecting it when a leak is found or when the user wants to open or close the gas valve by manipulating the lever of the key operation unit 211 or the gas valve as needed, first, the microprocessor 203 initializes all opening / closing position values of the previous gas valve read and set in the initial valve position reading process ST100 (step ST18), and based on the value currently read and set, the key operation unit 211. Through the input port P9 to search whether the user arbitrarily set the closing key or the opening key of the gas valve (step ST19, ST23).

As a result of the search, when the closing key of the gas valve is set through the key operating unit 211, the microprocessor 203 applies the low potential and the high potential to its output ports P16 and P15, respectively, to close the gas valve. (Step ST20), the two transistors TR3 (TR8) of the forward drive unit configured in the gas valve drive control unit 207 are conducted. Of course, at this time, the two transistors TR4 and TR7 configured in the reverse driving unit of the gas valve driving control unit 207 are blocked by the high potential and the low potential respectively output from the output ports P17 and P14 of the microprocessor 203. Becomes

Accordingly, when the transistor TR3 of the forward driver is turned on, the transistor TR5 of the rear stage is turned on so that the motor driving voltage of the third power supply terminal VDD is the transistor TR5, the gas valve motor 208, and the transistor TR8. The gas valve motor 208 is rotated in a clockwise direction to close the gas valve (step ST21), and when the gas valve is closed, the microprocessor 203 starts the display unit 205. The light emitting device LED2 emits light to give a closing indication, and the gas valve closing state is determined and returned through the gas valve state detecting unit 212 described above (step ST22).

When the opening key of the gas valve is set through the key operating unit 211 as a result of the search in the above steps ST19 and ST23, the output ports P14 and P17, respectively, of the high potential and the low are opened to open the gas valve. The electric potential is generated (step ST24) to conduct the two transistors TR7 (TR4) of the reverse drive section configured in the gas valve driving control section 207. Of course, at this time, the two transistors TR3 and TR8 configured in the forward driver of the gas valve driving control unit 207 are blocked by the high potential and the low potential respectively output from the output ports P16 and P15 of the microprocessor 203. do.

When the transistor TR4 of the reverse driver is turned on, the rear transistor TR6 is turned on so that the motor driving voltage of the third power supply terminal VDD causes the transistor TR6, the gas valve motor 208, and the transistor TR7 to be turned on. Since the gas valve motor 208 rotates counterclockwise, the gas valve is opened while the gas valve is opened (step ST25). When the gas valve is opened, the third light emitting device LED3 of the display unit 205 is opened. The light is displayed to display the open state, and the gas valve open state is determined through the gas valve state detection unit 212 and returned again (step ST26).

If the closing and opening keys from the key operation unit 211 are not set as a result of the search in the above steps ST19 and ST23, it is determined whether the closing and opening operation by the lever of the gas valve is performed (steps ST27, ST29).

In other words, a gas valve with a large capacity can be rotated to a certain degree by a user operating a lever of an arbitrary gas valve, but cannot be rotated to a fully closed state or an open state, but only through the gas valve motor 208. Can open and close.

Therefore, if the user rotates the lever of the gas valve slightly clockwise to close the gas valve, the gas valve state detection unit 212 built in the gas valve motor 208 as shown in FIG. The first and second switches SW1 and SW2 are both short-circuited and placed in the neutral position.

Therefore, the microprocessor 203 detects the current gas valve position through the gas valve state detection unit 212 described above, and then reads the opening / closing position value of the previously set gas valve.

At this time, if the position value of the previously set gas valve is the open position value, it is determined that the current gas valve is intended to be closed, and the gas valve motor 208 is clocked through the gas valve driving control unit 207 in the manner described above. Direction to close the gas valve (step ST28) and return (step ST31).

On the contrary, if the user slightly rotates the lever of the gas valve counterclockwise to open the gas valve, the first and second switches SW1 and SW2 of the gas valve state detection unit 212 are short-circuited in the manner described above. The microprocessor 203 reads the opening / closing position value of the previously set gas valve and if the position value of the previously set gas valve is the closed position value, the microprocessor 203 intends to open the current gas valve. The gas valve motor 208 is completely rotated counterclockwise through the gas valve driving control unit 207 in the manner described above to open the gas valve (step ST30) and return (step ST31). .

When there is no lever operation of the gas valve as a result of the search in the above steps ST27 and ST29, the gas detection comparison unit 201 searches whether there is a gas leak (step ST32).

That is, the gas detection comparison unit 201 is a voltage difference generated by the first and second gas sensors K1 and K2 of the gas detection unit 201 when the gas leaks through the resistors R4 and R5. The inverting terminal (-) of the comparator 201a is input, and the non-inverting terminal (+) of the comparator 201a is set through the resistors R1-R2 and the variable resistor VR1 of the reference voltage setting unit 214. By receiving the reference voltage and comparing these two voltages, if the reference voltage is high, the high potential, if the reference voltage is low to transfer the low potential to the input tote (P6) of the microprocessor 203 through the capacitor (C1). do.

Therefore, the microprocessor 203 determines that there is no gas leakage when the high potential is input to its input port P6, and performs the main routine of the above-described self-diagnosis process ST101 (step ST33), and the low potential If is input, it is determined that the gas leak to perform the abnormalout of the gas leakage alarm generating process (ST103) (step ST34).

The gas leakage alarm generating process (ST103) is an abnormalutin process for generating an alarm indication and an alarm sound when a gas leaks, and when a gas leak occurs in the opening and closing intention detection process (ST102), the micro The processor 203 closes the gas valve unconditionally through the gas valve driving control unit 207 and the gas valve motor 208 after the initialization is released (step ST34) and terminates the alarm through the key operation unit 211. The diode D3 and the transistor TR2 of the alarm sound generator 209 are switched through the output port P13 at intervals of a predetermined time t1 until a key is input to generate an alarm sound through the speaker 209a. (Step ST36).

When the alarm end key is set by the user through the key operation unit 211 (step ST37), the microprocessor 203 cuts off the transistor TR2 of the alarm sound generation unit 209 to terminate the alarm generation (step ST37). ST38) The gas leak is searched through the gas detection comparing unit 201 in the same manner as described above, and if there is no leakage of gas, the main routine of the self-diagnosis process ST100 is performed (ST40). If there is a leak, the process after the step ST34 is repeated.

The abnormal alarm generation process ST104 is an error routine process that generates an alarm when an error occurs by self-diagnosing abnormality of the gas detection unit 200 and the gas valve from time to time during the self-diagnosis process ST101.

That is, as shown in (e) of FIG. 6, if there is an error of the gas detecting unit 200 or the gas valve after the initializing of the error (step ST41) (steps ST42 and ST44), respectively, different time periods are determined according to the corresponding error ( It returns until the alarm end key of the key operation unit 211 is input through the output port P13 at intervals t2 and t3 (step ST48), and generates an alarm sound through the alarm sound generator 209 (step ST48). ST34 and ST45, when the alarm termination key is set from the key operation unit 211, the alarm sound generation ends (step ST47) and the main routine of the self-diagnosis process ST101 is performed (step ST48).

In addition, the key operation unit 211 is a key, it can be selected and input the gas valve closed or open or alarm end key signal. That is, as an example, pressing the key operation unit 211 is set as the open signal of the gas valve, pressed twice as a closed signal of the gas valve, and pressed as a gas alarm end signal when pressed three times.

In the combined use of the gas valve control device of the present invention, which is not described above, with another external gas alarm, the second dip switch 202b of the function selection unit 202 is set first, and the first dips After determining and setting what kind of sensor is the gas sensor of the external gas alarm through the position 202a, the output port of the external gas alarm (including the gas sensor and the gas detection comparator) is input to the input port of the microprocessor 203. When coupled to (P8) it is to perform the opening and closing operation of the gas valve according to the gas alarm, the self-diagnosis of the gas valve and the gas leakage in the same manner as described above.

In addition, another alarm generating unit is connected to the output port P18 of the microprocessor 203 so as to sound an alarm.

In the drawing, reference numeral 888 in the drawing denotes an oscillator for generating a clock of a predetermined period in the microprocessor 203.

As described in detail above, according to the present invention, by providing a self-diagnostic function of the gas sensor for detecting gas leakage and the gas valve, the alarm and the gas valve to the user at different times in case of abnormality or gas leakage. In addition to blocking the power supply, it detects the user's artificial gas valve lever operation in the event of an emergency and effectively controls the gas valve motor so that the gas supply can be shut off precisely regardless of whether the gas sensor is detected.

Claims (14)

An initial valve position reading process of determining whether the gas detecting means is operated within a set operating time after system initialization and detecting and setting an open / closed position of the gas valve according to whether the gas detecting means is operated; The self-diagnosis process and the initial valve position for resetting the operation time when there is no operation of the gas detection means within the set operation time to self-diagnose the state of the gas detection means and the gas valve and control the gas valve according to the diagnosis state. Opening and closing for controlling the opening and closing of the gas valve repeatedly according to the detection result by detecting the operation state and gas leakage of the lever and key control unit of the gas valve according to the user based on the current opening and closing position value set in the reading process Intention detection process; A gas leakage alarm generating process of closing the gas valve unconditionally and generating an alarm sound at a predetermined time interval when the gas leakage is detected without a user's intention to open and close the detection result during the opening and closing intention detection process; And an abnormal alarm generating process of generating an alarm sound when an abnormal state of the gas detecting means and the gas valve is detected as a result of the diagnosis in the self-diagnosis process. The method of claim 1, wherein the initial valve position reading process comprises: a first step of setting an operation time of the gas sensing means after initializing the system; A second step of searching for operation of the gas detecting means during the operation time; A third step of reading the position of the gas valve if there is an operation of the gas detecting means within the set operating time; Setting an open state if the read result is an open state; And a fifth step of setting a closed state if the reading results in the third step is a closed state. The method of claim 1, wherein the self-diagnosis process comprises: a first step of resetting the operation time when the gas detecting means does not operate within a set operation time; A second step of searching for an error of the gas detecting means and the gas valve; And a third step of controlling opening and closing of the gas valve and returning the gas valve by controlling the gas valve motor if there is no occurrence of the error. The method of claim 1, wherein the opening and closing intention detection process comprises: a first step of searching for a user's input of a gas valve closing and opening key based on a value set in the initial valve position reading process; A second step of opening and closing the gas valve according to the selected position if the gas valve is closed or opened as a result of the search; A third step of searching whether there is a lever operation of a gas valve by a user when there is no closing or opening key as a result of the searching; A fourth step of stirring and returning the opening and closing of the gas valve according to the operation of the lever if there is a lever operation as a result of the searching; If there is no lever operation of the gas valve, the gas detecting means detects whether there is a gas leak, and if there is no leak, the self-diagnosis process is carried out. Automatic control method. The gas leakage alarm generating process is configured to close the gas valve through a gas valve driving control means and generate an alarm sound until an alarm end key is input when a gas leak occurs in the opening / closing intention detection process. Step 1; When the alarm end key is input, the alarm is terminated, and if the gas detection means is searched for gas leakage, the first step is repeatedly performed, and if not, the second step of returning to the self-diagnosis process is performed. . The method of claim 1, wherein the abnormal alarm generating step comprises: a first step of generating an alarm sound until an alarm end key is input at a predetermined time interval when there is a gas sensing means or a gas valve error during the initial valve position reading process; And a second step of terminating the alarm and returning to the self-diagnosis process when the alarm end key is input. 7. The automatic method of controlling a gas valve according to claim 5 or 6, wherein the alarm at the time of detecting a gas leak and the alarm at the time of an error of the gas detecting means and the gas valve generate an alarm sound with a different time difference. The gas valve opening and closing intention determination by the lever operation of the gas valve is determined by the opening and closing position value of the gas valve set in the initial valve position reading process and the intermediate position value of the gas valve lever by the lever operation of the current gas valve. And if the previous value is closed, the current open intention is judged, and if the previous value is open, the gas valve is automatically controlled. 3. The method of claim 2, further comprising controlling, closing, and setting the gas valve when the opening and closing position of the gas valve is in a neutral state. Gas detection comparing means for comparing the voltage change according to the gas leakage detection with the reference voltage in the gas detecting means and outputting the resultant voltage; Gas valve state detection means built in a gas valve motor for controlling the opening and closing of the gas valve and detecting an opening and closing position of the gas valve and an error state; A limiter circuit unit for limiting the voltage detected by the gas valve state detecting means to a predetermined level; Key operation means for selectively setting the opening and closing of the gas valve and whether or not an alarm is generated by a user; Determining whether the gas valve is open or closed and error state periodically by using the voltage supplied from the gas leakage limiter circuit part according to the result of the error detection and the gas detection comparison calculation of the gas detecting means. A series of gas valve control devices are generated by generating an open / closed control signal of an alarm, an alarm control signal, a valve error check signal, and an open / close check signal, and generate an alarm termination and gas valve open / close control signal according to the key operation of the key operation means. A microprocessor for controlling the operation; And a gas valve driving control means for rotating the gas valve motor forward and reverse according to the gas valve opening / closing control signal obtained by the microprocessor and transferring the error signal and the opening / closing position signal detected by the gas valve state detecting means to the microprocessor. Gas valve automatic control device, characterized in that. 12. The diode (D6) (D7) according to claim 10, wherein the diodes (D6) and (D7) are connected in forward direction at both terminals of the gas valve motor of the gas valve state detection means to supply the open / close check signal and the error check signal provided from the microprocessor to the gas valve. And a first switch and a second switch roll configured to be connected to and connected to the gas valve, respectively, and switched to contact with rotation of the gas valve to supply or shut off the open / close check signal and the error check signal to the gas valve motor. Valve automatic control. 11. The gas valve driving control means according to claim 10, wherein the gas valve driving control means rotates the gas valve motor clockwise according to the closing control signal supplied from the microprocessor, and transmits the open / close position signal and the error signal of the gas valve state detection means to the microprocessor. Forward drive means; Automatic control of the gas valve, characterized in that the gas valve motor is rotated counterclockwise according to the opening control signal supplied from the microprocessor and the reverse configuration means for transmitting the opening and closing position signal and the error signal of the gas valve state detection means. Device. 12. The microprocessor of claim 10 or 11, wherein the microprocessor connects two input ports to both terminals of the gas valve state detecting means to selectively detect the open / close position and error state of the gas valve. Gas valve automatic control device, characterized in that configured to receive a feedback input by generating a signal. The gas according to claim 10, wherein the microprocessor is configured such that one input port for detecting an error state of the gas sensing means is connected to the gas sensing means to receive a voltage difference according to whether the gas sensing means is disconnected. Valve automatic braking system.