TWI783745B - Gas stove ignition control system and method thereof - Google Patents

Abstract

A gas stove ignition control system and a gas stove ignition control method are provided. Gas stove ignition control system is including a micro switch, a high voltage ignition needle, a gas solenoid valve, a thermocouple sensor and a control circuit. When the micro switch is activated and contacted a gas switch, a power supply circuit is turned on, and the control circuit automatically executes an ignition procedure after obtaining power from the power supply circuit. When the control circuit executes the ignition procedure, the control circuit controls the gas solenoid valve and the high voltage ignition needle to perform a high-pressure ignition. The control circuit judges whether the ignition is successful according to the sensing result of the thermocouple sensor. When the control circuit judges that the ignition is successful, the ignition action of the high voltage ignition needle is turned off. When the control circuit judges that the ignition fails, the ignition action of the high voltage ignition needle and the gas solenoid valve are turned off.

Description

Gas furnace ignition control system and gas furnace ignition control method

The invention relates to a heating device, in particular to a gas furnace ignition control system and a gas furnace ignition control method.

The existing gas stove ignition method mainly starts the gas switch by the user, and the gas switch will touch the micro switch inside the gas stove during the starting process. For example, the way for the user to activate the gas switch is to press down the gas switch first, and then the gas switch will touch the first micro switch, so that the gas stove is ignited. Then the user turns the gas switch to the left, and at this time the gas switch will contact the second micro switch, so that the ignition system of the gas stove is energized.

The technical problem to be solved by the present invention is to provide a gas furnace ignition control system and a gas furnace ignition control method for the deficiencies of the prior art.

An embodiment of the present invention provides an ignition control system for a gas stove, which is suitable for controlling a burner of the gas stove, including a micro switch, a high voltage ignition pin, a gas solenoid valve body, a thermocouple sensor and a control circuit. Wherein the micro switch is activated according to a gas switch to conduct a power supply circuit. The control circuit is electrically connected to the micro switch, the high voltage ignition pin, the gas solenoid valve body and the thermocouple sensor. Wherein, when the micro switch is activated and contacted by the gas switch, the power supply circuit is turned on; wherein the control circuit automatically executes an ignition procedure after obtaining the power supply from the power supply circuit. where the control circuit performs When performing the ignition procedure, the control circuit controls the suction valve of the gas solenoid valve body to release the gas, and controls the high-voltage ignition needle to perform high-voltage ignition, and judges whether the ignition is successful or not based on the sensing result of the thermocouple sensor. Wherein when the control circuit determines that the ignition is successful, the ignition action of the high-voltage ignition needle is closed, and when the control circuit determines that the ignition fails, the ignition action of the high-voltage ignition needle and the gas solenoid valve body are closed to stop releasing the gas.

The embodiment of the present invention provides an ignition control method for a gas stove, which is suitable for controlling a burner of the gas stove, including: when a micro switch of the gas stove starts contacting a gas switch of the gas stove, a power supply circuit is turned on; A control circuit automatically executes an ignition program after obtaining the power supply of the electric circuit; when the control circuit ignition program is executed, the control circuit controls a gas solenoid valve body suction valve of the gas furnace to release the gas, and controls a high pressure of the gas furnace The ignition needle performs high-voltage ignition, and judges whether the ignition is successful through the sensing result of a thermocouple sensor of the gas furnace; wherein when the control circuit judges that the ignition is successful, the ignition action of the high-voltage ignition needle is turned off, and when the control circuit judges that the ignition fails , close the ignition action of the high-pressure ignition needle and close the gas solenoid valve body to stop the release of gas.

To sum up, the gas furnace ignition control system and the gas furnace ignition control method provided by the embodiments of the present invention can simplify the user's ignition operation time, and only need to use a single micro switch to accurately determine the ignition action of the gas switch , and through the automatic ignition judgment mechanism, the convenience and safety of ignition are effectively improved.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings related to the present invention. However, the provided drawings are only for reference and description, and are not intended to limit the present invention.

1: Gas stove

10: Gas furnace ignition control system

101: Control circuit

103a, 103b: micro switch

105a/105b: High voltage ignition needle

107a/107b: Thermocouple sensor

109a/109b: main power supply circuit

111a/111b: gas solenoid valve body

113a/113b: fire proportional controller

115a/115b: dry temperature sensor

117a/117b: furnace base temperature sensor

119a/119b: Pot setting sensor

121: Man-machine control interface

12a/12b: Burner

14a, 14b: gas switch

20: Power

S301: start the gas switch

S303: The micro switch is turned on

S305: Power supply

S307: Turn on the high-voltage ignition needle and the gas solenoid valve body to execute the ignition procedure

S309: Ignition is successful

S311: Close the high-voltage ignition needle and keep the gas solenoid valve body

S313: Close the high-voltage ignition needle and the gas solenoid valve body

S401: start the gas switch

S403: The micro switch is turned on

S405: Power supply

S407: Turn on the high-pressure ignition needle and the gas solenoid valve body to execute the ignition procedure

S409: Obtain thermocouple value

S411: Calculate the slope

S413: positive slope

S415: Exceeded the preset times

S417: Close the high-voltage ignition needle and keep the gas solenoid valve body

S419: The thermocouple value is lower than the preset value

S421: Close the gas solenoid valve body

S423: Close the high-voltage ignition needle and the gas solenoid valve body

S601: Start the gas switch

S603: The micro switch is turned on

S605: Power supply

S607: Turn on the high-pressure ignition needle and the gas solenoid valve body to execute the ignition procedure

S609: Obtain thermocouple value

S611: meet the ignition voltage within the first preset time

S613: meet the ignition voltage within the second preset time

S615: The slope change of the thermocouple value has a negative slope within the second preset time

S617: Close the high-voltage ignition needle and keep the gas solenoid valve body

S619: The thermocouple value is lower than the preset value

S621: Close the gas solenoid valve body

S623: Close the high-voltage ignition needle and the gas solenoid valve body

Fig. 1 is a schematic diagram of a gas furnace provided by an embodiment of the present invention.

Fig. 2 is a functional block diagram of a gas furnace ignition control system provided by an embodiment of the present invention.

Fig. 3 is a flow chart of a gas furnace ignition method provided by an embodiment of the present invention.

FIG. 4 is a flow chart of a gas furnace ignition control method through slope calculation according to an embodiment of the present invention.

Fig. 5A is the thermocouple voltage waveform diagram of successful ignition of the gas furnace.

Fig. 5B is a waveform diagram of the thermocouple voltage of the ignition failure of the gas furnace.

Fig. 5C is a waveform diagram of thermocouple voltage when the gas furnace is successfully ignited and extinguished.

FIG. 6 is a flow chart of a gas furnace ignition control method based on calculation of transmission time according to an embodiment of the present invention.

Fig. 7A is a waveform diagram of the thermocouple voltage of the gas furnace successfully ignited within the first preset time.

Fig. 7B is a waveform diagram of the thermocouple voltage of the gas furnace successfully ignited within the second preset time.

Fig. 7C is a waveform diagram of the thermocouple voltage when the gas stove is turned off after the ignition exceeds the first preset time.

FIG. 7D is a waveform diagram of a gas furnace that fails to ignite after the second preset time.

The implementation of the present invention is illustrated through specific specific examples below, and those skilled in the art can understand the advantages and effects of the present invention from the content provided in this specification. The present invention can be implemented or applied through other different specific embodiments, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only for simple illustration, and are not drawn according to the actual size, which is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the provided content is not intended to limit the protection scope of the present invention.

It should be understood that although terms such as "first", "second", and "third" may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another No. In addition, the term "or" used herein may include any one or a combination of more of the associated listed items depending on the actual situation.

The embodiment of the present invention provides a gas stove ignition control system and a gas stove ignition control method. The gas stove ignition control system described here can reduce the number of micro switches used, and can effectively shorten the ignition operation time for the user to turn on the gas stove point. And through automatic ignition and accurate judgment of whether the ignition is successful, the operation convenience and safety of the gas furnace ignition control system can be effectively improved.

[Hardware architecture of gas stove ignition control system]

Please refer to FIG. 1 and FIG. 2 respectively. FIG. 1 is a schematic diagram of a gas furnace provided by an embodiment of the present invention, and FIG. 2 is a functional block diagram of an ignition control system of a gas furnace provided by an embodiment of the present invention. The gas stove 1 described in this embodiment includes, for example, a burner 12a/12b and a gas stove ignition control system 10. The number of the burner 12a/12b described here is exemplified by two, but not limited thereto. The gas furnace ignition control system 10 is used to control the combustion status of the burner 12a/12b, such as various controls of ignition, flameout and firepower. For example, the gas furnace ignition control system 10 can automatically start subsequent ignition-related controls after the ignition is started manually, without human intervention. In addition, it is worth noting that when the ignition control system 10 of the gas stove detects that the ignition has been initiated manually, the ignition can be stopped immediately, and the ignition control system 10 automatically executes subsequent ignition related controls immediately.

Specifically, the gas furnace ignition control system 10 in this embodiment can detect whether each burner 12a/12b is artificially activated through a single micro switch. When the detection result is yes, the gas furnace ignition control system 10 can immediately start the power-on. The power-on procedure can also automatically maintain the ignition action in addition to starting the gas release, and at the same time judge whether the subsequent ignition is successful. If it is judged that the ignition is successful, it can Stop the ignition, and also stop the gas release immediately if it is judged that the ignition fails in addition to stopping the ignition.

In one embodiment, the gas furnace ignition control system 10, as shown in FIG. Detector 107a/107b, main power supply circuit 109a/109b, gas solenoid valve body 111a/111b, firepower proportional controller 113a/113b, dry burning temperature sensor 115a/115b, furnace seat temperature sensor 117a/117b, The pot state sensor 119a/119b, the man-machine control interface 121, the gas switch 14a/14b and the power supply 20. The control circuit 101 is electrically connected to the micro switch 103a/103b, the high voltage ignition pin 105a/105b, the thermocouple sensor 107a/107b, the main power supply circuit 109a/109b, the gas solenoid valve body 111a/111b, and the fire proportional controller 113a/ 113b, dry heating temperature sensor 115a/115b, furnace seat temperature sensor 117a/117b, pot state sensor 119a/119b, man-machine control interface 121, gas switch 14a/14b and power supply 20.

The circuit architecture shown in FIG. 2 is set corresponding to the number of burners 12a/12b in FIG. 1 . For example, micro switch 103a, high voltage ignition needle 105a, thermocouple sensor 107a, main power supply circuit 109a, gas solenoid valve body 111a, fire power proportional controller 113a, dry burning temperature sensor 115a, furnace seat temperature sensor 117a, The boiler state sensor 119a and the gas switch 14a cooperate with the control circuit 101 to control the ignition of one of the burners 12a of the gas stove 1 . And micro switch 103b, high voltage ignition needle 105b, thermocouple sensor 107b, main power supply circuit 109b, gas solenoid valve body 111b, fire power proportional controller 113b, dry burning temperature sensor 115b, furnace seat temperature sensor 117b, The boiler state sensor 119b and the gas switch 14b cooperate with the control circuit 101 to control the ignition of the other burner 12b of the gas stove 1 . The ignition control of one of the burners 12a will be described with an example below, and the ignition control of the other burner 12b is in the same manner, so it will not be repeated here.

In one embodiment, the microswitch 103a is electrically connected between the power supply 20 and the control circuit 101. The microswitch 103a determines whether to start the ignition according to the operation of the gas switch 14a, and then relatively determines whether to supply the power supply 20 to the ignition control system of the gas furnace. 10 uses. For example, when a person operates the gas switch 14a to start the ignition action, the micro switch 103a can conduct a power supply circuit according to the ignition action of the gas switch 14a, and the power supply circuit is connected between the power supply 20 and the control circuit 101, so that the power supply 20 The gas stove ignition control system 10 can be powered through this power supply circuit.

And when the control circuit 101 obtains the power supply 20 through the power supply circuit, it can automatically execute the ignition procedure. The ignition procedure described here includes but not limited to various controls such as high-pressure ignition, gas flow control, and flameout. The aforesaid gas switch 14a is, for example, a push knob. When the user presses the push knob and rotates it in one direction (such as left), the push knob can contact the micro switch 103a, so that the micro switch 103a conducts the power supply circuit. It should be noted that, in this embodiment, the gas switch 14a only contacts a single microswitch during operation.

And when the control circuit 101 obtains the power supply circuit through the micro switch 103a, it can respectively control the high-voltage ignition needle 105a, the thermocouple sensor 107a and the gas solenoid valve body 111a to execute the operation of the relevant ignition procedure. For example, after the control circuit 101 obtains power, it can supply power to related components used in the ignition process through the main power supply circuit 109a. And when the gas solenoid valve body 111a is powered by the main power supply circuit 109a, it automatically sucks the valve to release the gas, and the gas flow rate is controlled by the fire proportional controller 113a connected to the gas solenoid valve body 111a. The high-voltage ignition needle 105a is controlled by the control circuit 101. When the control circuit 101 controls the high-voltage ignition needle 105a to perform high-voltage ignition and discharge, the high-voltage ignition can ignite and burn the gas released by the gas solenoid valve body 111a. Burner 12a can output stove fire when burning. The thermocouple sensor 107a is controlled by the control circuit 101, and the thermocouple sensor 107a is used to sense the combustion status of the fire after the gas is ignited, and sends the sensing result back to the control circuit 101 for the control circuit 101 to judge accordingly Whether the fire is ignited successfully and whether the fire is turned off afterward.

For example, the thermocouple value output by the thermocouple sensor 107a is related to the temperature of the fire. The higher the fire temperature is, the greater the thermocouple value is, and the lower the fire temperature is, the smaller the thermocouple value is. As for the control circuit 101, the thermocouple value received by the control circuit 101 is a thermocouple voltage, and the control circuit 101 determines whether the fire is successfully ignited and whether the fire is turned off by judging the magnitude of the thermocouple voltage.

In addition, the dry heating temperature sensor 115a is used to judge whether the pot heated by the fire is If there is dry burning, the furnace base temperature sensor 117a is used to judge the temperature of the furnace base in the burner 12, and the pot-setting state sensor 119a is used to judge whether there is a pot placed on the furnace base. The sensing results of the sensor 115a, the oven base temperature sensor 117a and the pot setting sensor 119a are used to control the combustion status of the burner 12a relatively. In addition, the man-machine control interface 121 can be used for inputting relevant control signals, so as to perform corresponding operations on the control circuit 101 accordingly.

[The ignition method embodiment of gas furnace ignition control system]

Please refer to Figure 3. Fig. 3 is a flow chart of a gas furnace ignition method provided by an embodiment of the present invention. The flow chart shown in FIG. 3 is illustrated by using the architectures in FIG. 1 and FIG. 2 as examples, but not limited thereto. The process shown in FIG. 3 includes the following steps, for example.

In step S301, the gas switch 14a is activated. The gas switch 14a can be manually operated when the personnel perform the ignition.

In step S303, the micro switch 103a is turned on. After the microswitch 103a is contacted by the gas switch 14a, the microswitch 103a conducts the power supply circuit.

In step S305, supply power. After the gas furnace ignition control system 10 obtains the power supply 20 through the power supply circuit, the gas furnace ignition control system 10 can automatically take over the follow-up ignition procedure without manual operation, which means that the personnel can stop operating the gas switch 14a at this time operation.

In step S307, the high-pressure ignition needle 105 and the gas solenoid valve body 111 are turned on to execute the ignition procedure. After the control circuit 101 obtains the power supply, it controls the high-voltage ignition needle 105a to start the high-voltage discharge ignition action and controls the gas solenoid valve body 111a to start the gas output respectively.

In step S309, it is determined whether the ignition is successful. Here, the control circuit 101 can determine whether the combustion of the fire is stable by judging the sensing result of the thermocouple sensor 107a. For example, when the fire is burning stably, it means that the thermocouple value of the thermocouple sensor 107a is stably greater than a preset value.

In step S311, close the high pressure ignition needle 105a and keep the gas solenoid valve body 111a. When step S309 determines that the ignition is successful, the control circuit 101 can control the high-voltage ignition The needle 105a stops the ignition action, and continues to supply power to the gas solenoid valve body 111a, so that the gas solenoid valve body 111a can continuously suck the valve to supply gas for the fire to burn.

In step S313, the high-pressure ignition needle 105a and the gas solenoid valve body 111a are closed. When step S309 judges No to represent ignition failure, the control circuit 101 not only controls the high-voltage ignition needle 105a to stop the ignition action, but also stops supplying power to the gas solenoid valve body 111a, so that the gas solenoid valve body 111a stops releasing gas, and the fire is extinguished.

According to what is revealed in Figure 3, the personnel only need to perform the ignition action of starting the gas switch 14a in the ignition operation, and the gas furnace ignition control system 10 will automatically complete the ignition and judge whether the ignition is successful in subsequent operations. The process does not require human operation and at the same time ensures safe operation and convenience of ignition.

[Example of Gas Furnace Ignition Control Method Through Slope Calculation]

Please refer to Figure 4. FIG. 4 is a flow chart of a gas furnace ignition control method through slope calculation according to an embodiment of the present invention. The flow chart shown in FIG. 4 is illustrated by using the architectures in FIG. 1 and FIG. 2 as examples, but not limited thereto. The process shown in FIG. 4 includes the following steps, for example.

In step S401, the gas switch 14a is activated. The gas switch 103a can be operated manually when the personnel performs ignition.

In step S403, the micro switch 103a is turned on. After the microswitch 103a is contacted by the gas switch 14a, the microswitch 103a conducts the power supply circuit.

In step S405, supply power. After the gas furnace ignition control system 10 obtains the power supply 20 through the power supply circuit, the gas furnace ignition control system 10 can automatically take over the follow-up ignition procedure without manual operation, which means that the personnel can stop operating the gas switch 14a at this time operation.

In step S407, the high pressure ignition needle 105a and the gas solenoid valve body 111a are turned on to execute the ignition procedure. After the control circuit 101 obtains the power supply, it controls the high-voltage ignition needle 105a to start the high-voltage discharge ignition action and controls the gas solenoid valve body 111a to start the gas output respectively.

In step S409, the thermocouple value is obtained. The control circuit 101 obtains the thermocouple value after ignition through the thermocouple sensor 107a.

In step S411, the slope is calculated. The control circuit 101 calculates its slope change according to the obtained thermocouple value. For example, the control circuit 101 may receive multiple thermocouple values sequentially according to time, and calculate the slope of the thermocouple values according to the thermocouple values of two adjacent records.

In step S413, it is determined whether it is a positive slope. According to the calculation result of step S411, the control circuit 101 can know whether the thermocouple value increases with time after the ignition is started, causing the thermocouple value slope to be a positive slope, if yes, it means that the temperature after ignition is rising, otherwise, otherwise It represents the temperature drop after ignition.

In step S415, it is determined whether the preset number of times is exceeded. When the determination in step S413 is yes, the control circuit 101 accumulates the total number of positive slope determinations M by adding 1 each time, and determines whether the total number M is greater than the preset number N. When it is judged otherwise, return to step S409 to continue execution. If the judgment is yes, it can be determined that the ignition is successful and step S417 is executed.

In step S417, close the high pressure ignition needle 105a and keep the gas solenoid valve body 111a. When step S415 judges yes, it means that the slope change of the sensing result of the thermocouple sensor 107a belongs to normal ignition, the control circuit 101 can control the high-voltage ignition needle 105a to stop the ignition action, and continue to supply power to the gas solenoid valve body 111a, So that the gas solenoid valve body 111a can continuously suck the valve to supply gas to the furnace for combustion.

In step S419, it is determined whether the thermocouple value is lower than a preset value. When the ignition is successful, the control circuit 101 continues to judge the change of the thermocouple value of the thermocouple sensor 107a to know whether the fire is off. Here, the thermocouple value is compared with the preset value to know whether the thermocouple value is less than A preset value, the preset value is set as the flameout voltage that can distinguish the flameout of the furnace. When step S419 judges yes, execute step S421; when step S419 judges no, continue to step S419.

In step S421, the gas solenoid valve body 111a is closed. When step S419 judges as Yes, the control circuit 101 stops supplying power to the gas solenoid valve body 111a, so that the gas solenoid valve body 111a stops releasing gas, and the fire is turned off.

In step S423, the high pressure ignition needle 105a and the gas solenoid valve body 111a are closed. When step S413 determines otherwise, it means that the slope change presented by the sensing result of the thermocouple sensor 107a does not belong to normal ignition, and after the control circuit 101 determines that the ignition has failed, the control circuit 101 not only controls the high-voltage ignition pin 105 to stop the ignition action, but also stops the power supply Give the gas solenoid valve body 111a, so that the gas solenoid valve body 111a stops releasing gas, and the fire is turned off.

In one embodiment, the determination of step S413 shown in FIG. 4 is yes, and if the control circuit 101 determines the negative slope for two consecutive times according to the sensing result of the thermocouple sensor 107a, the control circuit 101 will also determine that the ignition fails, And execute step S423 to turn off the ignition action.

Please refer to FIG. 5A . FIG. 5A is a waveform diagram of the thermocouple voltage when the gas furnace is successfully ignited. Where T0 is the ignition start time. When the gas furnace ignition control system 10 of this embodiment is ignited by the method described in FIG. 4, assuming that the preset number of times in step S415 in FIG. When 107a senses the waveform shown in FIG. 5 , the control circuit 101 calculates that the thermocouple value (that is, the thermocouple voltage V) presents two positive slope changes in the time intervals of T0-T1 and T1-T2 respectively, Based on this, the control circuit 101 determines that the ignition is successful.

Please refer to FIG. 5B . FIG. 5B is a waveform diagram of the thermocouple voltage when the gas furnace fails to ignite. Where T0 is the ignition start time, when the gas furnace ignition control system 10 of this embodiment is ignited by the method shown in Figure 4, when the control circuit 101 senses the waveform shown in Figure 5B through the thermocouple sensor 107a, the control circuit The thermocouple values (ie, the thermocouple voltage V) calculated in the time intervals of T0-T1 and T1-T2 respectively exhibit negative slope changes, and the control circuit 101 determines that the ignition fails accordingly.

Please refer to FIG. 5C . FIG. 5C is a waveform diagram of the thermocouple voltage when the gas stove is successfully ignited and then turned off. Wherein S0 is the successful ignition time here. When the gas furnace ignition control system 10 of the present embodiment is ignited by the method described in FIG. 4, assuming that the flameout voltage in step S419 in FIG. When the overheating couple sensor 107a detects the waveform shown in Figure 5C, the control circuit 101 judges that the fire is normal combustion in the time intervals of S0-S1 and S1-S2 respectively, and after the elapse of time S3 , when the calculated thermocouple value (that is, the thermocouple voltage V) is less than VL, the control circuit 101 will determine that the fire is off, and the control circuit 101 will close the gas solenoid valve body 111a accordingly.

[Example of Gas Furnace Ignition Control Method Calculated Through Time]

Please refer to Figure 6. FIG. 6 is a flow chart of a gas furnace ignition control method based on calculation of transmission time according to an embodiment of the present invention. The flow chart shown in FIG. 6 is an example of the architectures shown in FIG. 1 and FIG. 2 , but is not limited thereto. The process shown in FIG. 6 includes the following steps, for example.

In step S601, the gas switch 14a is activated. The gas switch 14a can be manually operated when the personnel perform the ignition.

In step S603, the micro switch 103a is turned on. After the microswitch 103a is contacted by the gas switch 14a, the microswitch 103a conducts the power supply circuit.

In step S605, supply power. After the gas furnace ignition control system 10 obtains the power supply 20 through the power supply circuit, the gas furnace ignition control system 10 can automatically take over the follow-up ignition procedure without manual operation, which means that the personnel can stop operating the gas switch 14a at this time operation.

In step S607, the high-pressure ignition needle 105a and the gas solenoid valve body 111a are turned on to execute the ignition procedure. After the control circuit 101 obtains the power supply, it controls the high-voltage ignition needle 105a to start the high-voltage discharge ignition action and controls the gas solenoid valve body 111a to start the gas output respectively.

In step S609, the thermocouple value is obtained. The control circuit 101 obtains the thermocouple value after ignition through the thermocouple sensor 107a.

In step S611, it is determined whether the ignition voltage is satisfied within the first preset time. Here the control circuit 101 judges whether the thermocouple value after ignition starts to meet the ignition voltage within a first preset time, where the thermocouple value is the thermocouple voltage. When step S611 judges yes, execute step S617 , and when step S611 judges no, execute steps S613 and S615 .

In step S613, it is determined whether the ignition voltage is satisfied within a second preset time. Here, the control circuit 101 judges whether the thermocouple value reaches the ignition voltage within the second preset time after ignition starts.

In step S615, it is determined whether the slope change of the thermal couple value has a negative slope within the second preset time. Here the control circuit 101 judges whether the slope of the thermocouple value has a negative slope within the second preset time after the ignition starts.

In step S617, close the high-pressure ignition needle 105a and keep the gas solenoid valve body 111a. When step S611 judges yes or step S613 judges yes, it means that the ignition is successful, the control circuit 101 can control the high-voltage ignition needle 105a to stop the ignition action, and continue to supply power to the gas solenoid valve body 111a, so that the gas solenoid valve body 111a can Continuous suction valve to supply gas for fire burning.

In step S619, it is determined whether the thermocouple value is lower than a preset value. After the ignition is successful, the control circuit 101 continues to judge the change of the thermocouple value of the thermocouple sensor 107a to know whether the fire is off. Here, the thermocouple value is compared with the preset value to know whether the thermocouple value is is less than the preset value, which is set as the flameout voltage that can distinguish the flameout of the furnace. When step S619 judges yes, execute step S621; when step S619 judges no, continue to step S619.

In step S621, the gas solenoid valve body 111a is closed. When step S619 judges yes, the control circuit 101 stops supplying power to the gas solenoid valve body 111a, so that the gas solenoid valve body 111a stops releasing gas, and the fire is turned off.

In step S623, the high-pressure ignition needle 105 and the gas solenoid valve body 111a are closed. When the judgment of step S613 is no or the judgment of step S615 is yes, after the control circuit 101 determines that the ignition has failed, the control circuit 101 not only controls the high-voltage ignition needle 105a to stop the ignition action, but also stops the power supply to the gas solenoid valve body 111a, so that the gas solenoid valve body 111a stops releasing gas, and the fire goes out.

Please refer to FIG. 7A . FIG. 7A is a waveform diagram of the thermocouple voltage of the gas furnace successfully ignited within the first preset time. Where T0 is the ignition start time, when the gas furnace ignition control system of the present embodiment 10 When igniting with the method described in FIG. 6, when the control circuit 101 senses the waveform shown in FIG. 7A through the thermocouple sensor 107a, the control circuit 101 calculates the thermocouple When the value reaches the satisfying point voltage Vs, the control circuit 101 determines that the ignition is successful accordingly.

Please refer to FIG. 7B . FIG. 7B is a waveform diagram of the thermocouple voltage of the gas furnace successfully ignited within the second preset time. Where T0 is the ignition start time. When the gas furnace ignition control system 10 of this embodiment is ignited by the method described in FIG. 6, when the control circuit 101 senses the waveform shown in FIG. 7B through the thermocouple sensor 107a, the control circuit When 101 calculates that the thermocouple value reaches the satisfying point voltage Vs in the second preset time period of T0-T2, the control circuit 101 determines that the ignition is successful accordingly.

Please refer to FIG. 7C . FIG. 7C is a waveform diagram of the thermocouple voltage when the gas stove is ignited and extinguished after the first preset time. Where T0 is the ignition start time. When the gas furnace ignition control system 10 of this embodiment is ignited by the method described in FIG. 6, when the control circuit 101 senses the waveform shown in FIG. 7C through the thermocouple sensor 107a, the control circuit 101 When it is calculated that the thermocouple value does not reach the satisfying point voltage Vs in the first preset time period of T0-T1, the control circuit 101 further calculates that the thermocouple value does not reach the voltage Vs in the time period of T1-T2. When the point voltage Vs is satisfied, and the thermocouple value changes from a positive slope in the time period T0-T1 to a negative slope in the time period T1-T2, the control circuit 101 determines that the ignition fails accordingly.

Please refer to FIG. 7D . FIG. 7D is a waveform diagram of the thermocouple pressure of the gas furnace that fails to ignite after the second preset time. Where T0 is the ignition start time. When the gas furnace ignition control system 10 of this embodiment is ignited by the method shown in FIG. 6, when the control circuit 101 senses the waveform shown in FIG. 7D through the thermocouple sensor 107a, the control circuit When 101 calculates that the thermocouple value does not reach the satisfying point voltage Vs in the second preset time period of T0-T2, the control circuit 101 can determine the ignition failure accordingly.

The first preset time in FIGS. 7A-7D is, for example, 3 seconds, and the second preset time is, for example, 5 seconds, but not limited thereto. In addition, the above-mentioned embodiments illustrated in FIG. 4 and FIG. 6 can effectively avoid the problem that the thermocouple sensor 107 a is not fixed due to the fouling of the thermocouple sensor 107 a due to long-term use.

In one embodiment, the control circuit 101 can be, for example, one or any combination of an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or a system-on-chip (SOC), and can cooperate with other related circuits. Components and associated firmware to achieve the above functional operations.

[Advantageous Effects of Embodiment]

The gas furnace ignition control system and gas furnace ignition control method provided by the present invention can effectively simplify the user's ignition operation mode, and only need to use a single micro switch to accurately determine the ignition action of the gas switch, and through automatic ignition judgment The mechanism can effectively avoid the problem of fouling of the thermocouple sensor, and at the same time improve the effectiveness and safety of ignition.

The content provided above is only a preferred feasible embodiment of the present invention, and does not therefore limit the scope of the patent application of the present invention, so all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention within the scope of the patent.

10: Gas furnace ignition control system

101: Control circuit

103a, 103b micro switch

105a/105b: High voltage ignition needle

107a/107b: Thermocouple sensor

109a/109b: main power supply circuit

111a/111b: gas solenoid valve body

113a/113b: fire proportional controller

115a/115b: dry temperature sensor

117a/117b: furnace base temperature sensor

119a/119b: Pot setting sensor

121: Man-machine control interface

14a, 14b: gas switch

20: Power

Claims (10)

An ignition control system for a gas stove, suitable for controlling a burner of the gas stove, comprising: a micro switch activated by a gas switch to control a power supply to the ignition control system of the gas stove; a high-voltage ignition needle; a gas A solenoid valve body; a thermocouple sensor; and a control circuit electrically connected to the micro switch, the high voltage ignition pin, the gas solenoid valve body and the thermocouple sensor; wherein when the micro switch is activated by the gas switch, the contact Afterwards, the gas furnace ignition control system obtains the power supply; wherein the control circuit automatically executes an ignition procedure after obtaining the power supply; wherein when the control circuit executes the ignition procedure, the control circuit controls the suction valve of the gas solenoid valve body to release the gas , and control the high-voltage ignition needle to perform high-voltage ignition, and judge whether the ignition is successful through the sensing result of the thermocouple sensor; wherein when the control circuit judges that the ignition is successful, the ignition action of the high-voltage ignition needle is turned off, and the control circuit judges Whether a thermocouple value output by the thermocouple sensor is lower than a preset value, if the thermocouple value is lower than the preset value, the control circuit closes the gas solenoid valve body to stop releasing gas; wherein when the control When the circuit judges that the ignition fails, the ignition action of the high-voltage ignition pin and the gas solenoid valve body are closed to stop releasing the gas. The gas furnace ignition control system as described in Claim 1, wherein the control circuit judges whether the ignition is successful by judging whether the slope change presented by the sensing result of the thermocouple sensor conforms to a normal ignition, if the slope change conforms to a normal ignition, The control circuit judges that the ignition is successful, if the slope change does not meet the normal ignition, the control circuit The control circuit judges the ignition failure. The gas furnace ignition control system as described in claim 2, wherein when the control circuit judges that the slope change is a continuous positive slope, the control circuit recognizes that the ignition is successful, and when the control circuit judges that the slope change is When the negative slope is present, the control circuit determines that the ignition has failed, and when the control circuit judges that the ignition is successful and the ignition action of the high-voltage ignition pin is turned off, the thermocouple voltage sensed by the control circuit through the thermocouple sensor is lower than one After the flameout voltage, the control circuit closes the gas solenoid valve body to stop releasing gas. The gas furnace ignition control system as described in Claim 1, wherein the control circuit determines whether the ignition is successful is to determine whether the thermocouple voltage sensed by the thermocouple sensor reaches a satisfactory ignition voltage within a first preset time, if It is judged that the control circuit judges that the ignition is successful. The gas furnace ignition control system as described in claim 4, wherein when the thermocouple voltage sensed by the thermocouple sensor cannot reach the satisfactory ignition voltage within the first preset time, the control circuit continues to judge that the thermocouple sensor Whether the thermocouple voltage sensed by the sensor reaches the satisfying ignition voltage within a second preset time, if the thermocouple voltage sensed by the thermocouple sensor reaches the satisfying firing voltage within the second preset time, the control circuit It is judged that the ignition is successful, and if the thermocouple voltage sensed by the thermocouple sensor cannot reach the satisfactory ignition voltage within the second preset time, the control circuit judges that the ignition is failed. A method for controlling the ignition of a gas stove, suitable for a gas stove ignition control system to control a burner of the gas stove, comprising: when a micro switch of the gas stove is activated and contacted by a gas switch of the gas stove, the ignition control of the gas stove The system obtains a power supply; when a control circuit of the gas furnace ignition control system obtains the power supply, it automatically executes an ignition procedure; wherein when the control circuit executes the ignition procedure, the control circuit controls the A gas solenoid valve body of the gas furnace sucks the valve to release the gas, and controls a high-voltage ignition needle of the gas furnace to perform high-voltage ignition, and judges whether the ignition is successful through the sensing result of a thermocouple sensor of the gas furnace; When the control circuit determines that the ignition is successful, the ignition action of the high-voltage ignition needle is turned off, and the control circuit determines whether a thermocouple value output by the thermocouple sensor is lower than a preset value, if the thermocouple value is lower than the preset value value, the control circuit closes the gas solenoid valve body to stop releasing gas; and when the control circuit judges that the ignition fails, it closes the ignition action of the high-voltage ignition needle and closes the gas solenoid valve body to stop releasing gas. The gas furnace ignition control method as described in Claim 6, wherein the control circuit judges whether the ignition is successful by judging whether the slope change presented by the sensing result of the thermocouple sensor conforms to a normal ignition, if the slope change conforms to a normal ignition, The control circuit judges that the ignition is successful, and if the slope change does not conform to normal ignition, the control circuit judges that the ignition fails. The gas furnace ignition control method as described in Claim 7, wherein when the control circuit judges that the slope change is a continuous positive slope, the control circuit recognizes that the ignition is successful, and when the control circuit judges that the slope change is When the negative slope is present, the control circuit determines that the ignition has failed, and when the control circuit judges that the ignition is successful and the ignition action of the high-voltage ignition pin is turned off, the thermocouple voltage sensed by the control circuit through the thermocouple sensor is lower than one After the flameout voltage, the control circuit closes the gas solenoid valve body to stop releasing gas. The gas furnace ignition control method as described in Claim 6, wherein the control circuit determines whether the ignition is successful is to determine whether the thermocouple voltage sensed by the thermocouple sensor reaches a satisfactory ignition voltage within a first preset time, if It is judged that the control circuit judges that the ignition is successful. The gas furnace ignition control method as described in Claim 9, wherein when the thermocouple voltage sensed by the thermocouple sensor cannot reach the satisfaction point within the first preset time When the ignition voltage is on, the control circuit continues to judge whether the thermocouple voltage sensed by the thermocouple sensor reaches the satisfactory ignition voltage within a second preset time, if the thermocouple voltage sensed by the thermocouple sensor is within the second When the preset time reaches the satisfactory ignition voltage, the control circuit judges that the ignition is successful, and if the thermocouple voltage sensed by the thermocouple sensor cannot reach the satisfactory ignition voltage within the second preset time, the control circuit judges that the ignition fails.

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