TW202316061A - Gas stove ignition detection control system and method thereof - Google Patents

Abstract

A gas stove ignition detection control system and a gas stove ignition detection control method are provided. Gas stove ignition control system is including a micro switch, a high voltage ignition needle, a gas solenoid valve, a first 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 detection procedure after obtaining power from the power supply circuit. The control circuit detects at least one of the first thermocouple sensor and the gas solenoid valve when the ignition detection procedure is executed. Wherein the high voltage ignition needle, the gas solenoid valve and the first thermocouple sensor of the gas stove are controlled to perform an ignition action according to the detection result. When the result of component detection is abnormal, the control circuit stops the ignition action.

Description

Gas furnace ignition detection system and gas furnace ignition detection method

The invention relates to a heating device, in particular to a gas furnace ignition detection system and a gas furnace ignition detection 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. However, in the case of an electronic gas stove, when the ignition is activated, the internal components are controlled through the electronic control board. For example, when the electric control board detects combustion through a thermocouple sensor, it will relatively control the gas. The solenoid valve body sucks the valve to release the gas. However, due to some factors, the relevant internal electronic components may be malfunctioned or short-circuited, and then the gas solenoid valve body cannot be closed smoothly, making the operation of the gas furnace dangerous.

The technical problem to be solved by the present invention is to provide a gas furnace ignition detection system and an ignition detection method thereof in view of the deficiencies in the prior art.

An embodiment of the present invention provides an ignition detection system for a gas furnace, which includes a micro switch, a high-voltage ignition needle, a gas solenoid valve body, a first 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 first thermocouple sensor. Wherein, when the micro switch is activated and contacted by the gas switch, the power supply circuit is turned on; the control circuit automatically executes an ignition detection program after obtaining power from the power supply circuit. When the control circuit executes the ignition detection program, it detects at least one actuator of the first thermocouple sensor and the gas solenoid valve body, and controls the high-voltage ignition needle, the gas solenoid valve body and the first thermocouple sensor to execute according to the detection results. When the ignition is activated; when the control circuit detects an abnormal result of the actuator, the control circuit stops the ignition.

An embodiment of the present invention provides a gas stove ignition detection method, including: when a micro switch of the gas stove is activated and contacted by a gas switch of the gas stove, a power supply circuit is turned on; and when a control circuit of the gas stove obtains power from the power supply circuit After that, an ignition detection program is automatically executed. Wherein the control circuit detects a first thermocouple sensor of the gas furnace and at least one actuator of a gas electromagnetic valve body of the gas furnace when executing the ignition detection program, and controls a high-voltage ignition needle, When the gas solenoid valve body and the first thermocouple sensor perform an ignition action; the control circuit stops the ignition action when the detection result of the actuator is abnormal.

A power supply circuit is turned on after the switch is activated and contacted; when a control circuit of the gas stove obtains the power supply of the electric circuit, the ignition detection program is automatically executed; when the ignition detection program of the control circuit is executed, the control circuit controls a gas solenoid valve of the gas stove The body suction valve is used 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 judges that the ignition is successful, it is closed The ignition action of the high-voltage ignition needle, and when the control circuit judges that the ignition fails, close the ignition action of the high-voltage ignition needle and close the gas solenoid valve body to stop releasing the gas.

To sum up, the gas furnace ignition detection system and the gas furnace ignition detection method provided by the embodiment of the present invention can detect the internal components after starting the ignition, and stop the ignition immediately if any component detection is abnormal, so that the ignition can be effectively improved. safety and reliability.

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.

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 mainly used to distinguish one component from another component, or one signal from another signal. 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 furnace ignition detection system and a gas furnace ignition detection method. The gas furnace ignition detection system described here means that it can detect whether there is a component failure during the ignition process, and can relatively control the ignition according to the component detection results. Whether it is still necessary to continue burning, this can effectively improve the operational reliability and safety of the ignition detection system of the gas stove, and avoid the combustion accident of the gas stove caused by abnormal components.

[Hardware Architecture of Gas Furnace Ignition Detection 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 a gas furnace ignition detection system 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 detection system 10, and the number of the burner 12a/12b mentioned here is exemplified as two, but not limited thereto. The gas stove described here is an electronic gas stove, and electronic automatic ignition control is mainly realized through the gas stove ignition detection system 10 .

Here, the ignition detection system 10 of the gas furnace is used to control the combustion status of the burner 12, such as various controls of ignition, flameout, firepower and component detection. For example, the gas furnace ignition control system 10 can automatically start subsequent ignition-related controls and related component detection after the ignition is started manually, without human intervention. In addition, it is worth noting that when the ignition detection system 10 of the gas stove detects that the ignition has been started manually, the ignition can be stopped immediately, and the ignition detection system 10 of the gas stove will automatically perform subsequent ignition-related control immediately. And it can be stopped immediately when the abnormality of the component detection is harmful to the normal combustion of the gas.

Specifically, the ignition detection system 10 of the gas furnace in this embodiment can detect whether each burner 12 is manually activated through a single micro switch. When the detection result is yes, the gas furnace ignition detection 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 detect the components used in the ignition, and at the same time determine whether the subsequent ignition is If the ignition is successful, then the ignition can be stopped if it is judged that the ignition is successful, and if it is judged that the ignition fails, the gas release will be stopped immediately in addition to stopping the ignition.

In one embodiment, the gas furnace ignition detection system 10 as shown in FIG. Thermocouple sensor 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 base 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 first thermocouple sensor 107a, the second thermocouple sensor 107b, the main power supply circuit 109a/109b, the gas solenoid valve body 111a/ 111b, fire power proportional controller 113a/113b, dry heating temperature sensor 115a/115b, furnace base temperature sensor 117a/117b, pot status 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, first thermocouple sensor 107a, main power supply circuit 109a, gas solenoid valve body 111a, fire power proportional controller 113a, dry burning temperature sensor 115a, furnace base temperature sensor 117a, the pot setting 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, second 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 pot 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 detection system of the gas stove. 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 detection 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 detection procedure. The ignition detection procedure described here includes but not limited to various controls such as high pressure ignition, gas flow control, flameout and component detection. 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 first thermocouple sensor 107a and the gas solenoid valve body 111a to execute the operation of the relevant ignition detection program. For example, after the control circuit 101 obtains the power supply, it can supply power to the relevant components used in the ignition detection 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 ignition is successful. The first thermocouple sensor 107a is controlled by the control circuit 101, and the first thermocouple sensor 107a is used to sense the combustion state of the furnace fire after the gas is ignited, and sends the sensing result back to the control circuit 101 for the control circuit 101 Based on this, it is judged whether the ignition of the fire is successful and whether the fire is subsequently turned off.

For example, the thermocouple value output by the first 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-burning temperature sensor 115a is used to judge whether the pot heated by the fire is dry-burned, the stove seat temperature sensor 117a is used to judge the temperature of the stove seat in the burner 12, and the pot state sensor 119a is used to judge whether there is a pot placed on the stove seat, and the control circuit 101 controls the burner relatively according to the sensing results of the dry-burning temperature sensor 115a, the stove seat temperature sensor 117a, and the pot state sensor 119a respectively. 12a Combustion conditions. 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.

It is also worth mentioning that the control circuit 101 can detect the components used in the ignition process when executing the ignition detection program, for example, it can detect at least one actuator of the first thermocouple sensor 107a and the gas solenoid valve body 111a, and according to The detection result controls when the high-voltage ignition needle 105a, the gas solenoid valve body 109a and the first thermocouple sensor 107a perform an ignition action. In one embodiment, when the control circuit 101 detects an abnormal result of the actuator, the control circuit 101 stops the ignition operation. In addition, the control circuit 101 can output an abnormal signal through an alarm circuit (not shown) when the above detection is abnormal. This abnormal signal can be, for example, various combinations of sound, light or display signals.

[Ignition Detection Method of Gas Furnace Ignition Detection System]

Please refer to Figure 3. Fig. 3 is a flow chart of a gas furnace ignition detection 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 detection system 10 obtains the power supply 20 through the power supply circuit, the gas furnace ignition detection system 10 can automatically take over the follow-up ignition detection process without manual operation, which means that the personnel can stop the gas 14a at this time operation of the switch.

In step S307, an ignition detection procedure is executed. Here, the control circuit 101 can control and open the high-voltage ignition needle 105 and the gas solenoid valve body 111 to execute the ignition detection procedure. When the control circuit 101 obtains 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 turn on the gas output, and performs element detection on the first thermocouple sensor 107a or the gas solenoid valve body 111a.

In step S309, it is determined whether the component detection is normal. The control circuit 101 can know whether the component is faulty or whether the connection of the component is normal through relevant electrical tests. For example, it is possible to detect abnormal conditions such as short circuit or electric leakage of the element, but it is not limited thereto.

In step S311, it is determined whether the ignition is successful. When step S309 judges yes, it means that the component detection result is normal and will not affect the ignition operation. Therefore, the control circuit 101 can further determine whether the ignition is successful. Here, the control circuit 101 can judge the sensing result of the thermocouple sensor 107a to Know whether the furnace fire is burning stably. 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. If the thermocouple value is greater than the preset value, the control circuit 101 can determine that the ignition is successful accordingly.

In step S313, close the high pressure ignition needle 105a and keep the gas solenoid valve body 111a. When step S311 determines 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 continuously suck the valve to supply gas to the furnace Fire burning use.

In step S315, the high-pressure ignition needle 105a and the gas solenoid valve body 111a are closed. When step S309 determines whether it means that the element is abnormal or whether step S311 determines whether it means 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 The release of gas ceased, and the fire went out.

According to Fig. 3, the personnel only need to execute the ignition action of starting the gas switch 14a in the ignition operation, and the gas furnace ignition detection system 10 will automatically complete component detection, ignition and judge whether the ignition is successful or not in subsequent operations. , this process does not require human operation and at the same time ensures the safe operation and convenience of ignition.

[Detection Example of Thermocouple Sensor]

Please refer to Figure 4A. FIG. 4A is a schematic diagram of detection of a thermocouple sensor according to an embodiment of the present invention. The control circuit 101 has a first signal pin B, a second signal pin D and a plurality of detection pins X, wherein the first signal pin B is electrically connected to the output pin of the first thermocouple sensor 107a, and the second signal pin D is electrically connected to the output pin of the first thermocouple sensor 107a. The output pins of the second thermocouple sensor 107b are connected, and the detection pins X are adjacent to the two sides of the first signal pin B and the second signal pin B respectively.

In one embodiment, the control circuit 101 conducts an electrical test for short-circuiting the output pins of the first thermocouple sensor 107a or the second thermocouple sensor 107b through the detection pin X. For example, by providing a detection level to the detection pin X, and the detection level is opposite to the normal ignition level output by the output pin of the first thermocouple sensor 107a or the second thermocouple sensor 107b. For example, when the normal ignition level of the thermocouple sensor is a high level output, the detection level at this time can be the ground level of the low logic level output. Or when the normal ignition level of the thermocouple sensor is a low level output, the detection level can be a high level output at this time.

Therefore, when the first thermocouple sensor 107a or the second thermocouple sensor 107b is working, the control circuit 101 can detect whether the level of the first signal pin B or the second signal pin D is the same as the detection level, if If the test result is yes, it can be determined that the component is abnormal; otherwise, if the test result is negative, it can be determined that the component is normal.

Please refer to FIG. 4B . FIG. 4B is a flowchart of a thermocouple detection method. The flow chart shown in FIG. 4B is illustrated by the architectures of FIG. 1 , FIG. 2 and FIG. 4A , but is not limited thereto. The process shown in FIG. 4B means that the control circuit 100 performs element detection on the thermocouple sensor when executing the ignition detection program, for example, including the following steps.

In step S401, initialization. The detection level is provided to the detection pin X in the control circuit 101, and the levels of the first signal pin B and the second signal pin D are respectively read.

In step S403, it is detected whether there is a short circuit. The control circuit 101 judges whether the level of the first signal pin B or the second signal pin D is the same as the detection level. In this way, the output pin of the first thermocouple sensor 107a or the second thermocouple sensor 107b can be detected. Whether it is short-circuited with the adjacent detection pin X.

In step S405, abnormal. If the detection result of step S403 is yes, that is, when the level of the output pin of the first thermocouple sensor 107a or the second thermocouple sensor 107b is the detection level, the control circuit 101 can identify the first thermocouple sensor 107a Or the abnormal condition that the second thermocouple sensor 107b is short-circuited.

In step S407, close. When the control circuit 101 determines that there is an element abnormality in the first thermocouple sensor 107a or the second thermocouple sensor 107b, the control circuit 101 immediately shuts down the ignition, so that the fire can be turned off, thereby avoiding unnecessary accidents in the gas furnace. The closing here can be, for example, the control circuit 101 closing the high-voltage ignition needle 105a and the gas solenoid valve body 107a to stop the subsequent combustion of the gas.

In step S409, normal. If the detection result of step S403 is negative, that is, when the level of the output pin of the first thermocouple sensor 107a or the second thermocouple sensor 107b is not the detection level, the control circuit 101 can identify the first thermocouple sensor 107a And the second thermocouple sensor 107b has no abnormal condition of short circuit.

In step S411, the combustion is continued. When the element is detected to be normal, the control circuit 101 can control the gas stove 1 to continue burning without being affected.

In step S413, it is determined whether the thermocouple value is lower than the lower limit. The control circuit 101 can know whether the fire is off according to whether the thermocouple value of the first thermocouple sensor 107a or the second thermocouple sensor 107b is lower than the lower limit value. When step S413 judges otherwise, for example, it may go back to step S403 to continue execution. And when the determination in step S411 is yes, the control circuit 101 executes step S405 to determine that the fire may be turned off abnormally. The lower limit value mentioned here is, for example, a value at which the thermal sensing value can sense that the furnace is turned off. Please refer to FIG. 4C . FIG. 4C is a detection waveform diagram of the thermocouple voltage in FIG. 4A . Figure 4C shows the thermocouple voltages of the detection pin and the first signal pin B/second signal pin b (that is, the thermocouple value of the first thermocouple sensor 107a or the second thermocouple sensor 107b), wherein the detection pin X The detection level of the first thermocouple sensor 107a or the second thermocouple sensor 107b works normally and outputs a thermocouple value of a high logic level (ie, 5V voltage).

From FIG. 4C, it can be known that the element abnormality of the first thermocouple sensor 107a or the second thermocouple sensor 107b did not occur in the time period T0-T1, so the first signal pin B/the second signal pin The level of D is the normal ignition level of the first thermocouple sensor 107a or the second thermocouple sensor 107b. After the time T1, the element abnormality of the first thermocouple sensor 107a or the second thermocouple sensor 107b occurs, so the level of the first signal pin B/second signal pin D is the same as the detection level At this time, the control circuit 101 can determine that the first thermocouple sensor 107a or the second thermocouple sensor 107b is short-circuited with the adjacent detection pin X, and the element is abnormal.

Please refer to Figure 5A. FIG. 5A is a schematic diagram of detection of multiple thermocouple sensors according to an embodiment of the present invention. The control circuit 101 has a first signal pin B, a second signal pin D and a plurality of detection pins X, wherein the first signal pin B is electrically connected to the output pin of the first thermocouple sensor 107a, and the second signal pin D is electrically connected to the output pin of the first thermocouple sensor 107a. The output pin of the second thermocouple sensor 107b is connected, and the first signal pin B and the second signal pin D are adjacent to each other, that is, the first signal pin B is located between the detection pin X and the second signal pin D, and The second signal pin D is located between another detection pin X and the first signal pin B, and the detection pin X is adjacent to one side of the first signal pin B and the second signal pin D respectively.

In one embodiment, the control circuit 101 can conduct an electrical test for short-circuiting the output pins of the first thermocouple sensor 107 a or the second thermocouple sensor 107 b through the detection pin X. For example, by providing a detection level to the detection pin X, and the detection level is opposite to the normal ignition level output by the output pin of the first thermocouple sensor 107a or the second thermocouple sensor 107b. For example, when the normal ignition level of the thermocouple sensor is a high level output, the detection level at this time can be the ground level of the low logic level output. Or when the normal ignition level of the thermocouple sensor is a low level output, the detection level can be a high level output at this time. The detection method of the first signal pin B or the second signal pin D by the detection pin X can refer to the descriptions of the above-mentioned embodiments in FIG. 4A-FIG.

It is worth noting that the control circuit 101 can further detect whether there is an abnormal component through the first signal pin B and the second signal pin D that are adjacent to each other. For example, by providing a detection level to the second signal pin D, and the detection level is opposite to the normal ignition level output by the output pin of the first thermocouple sensor 107a. For example, when the normal ignition level of the first thermocouple sensor 107a is a high level output, the detection level at this time can be the ground level of the low logic level output. Or when the normal ignition level of the first thermocouple sensor 107a is a low level output, the detection level at this time can be a high level output.

Or, by providing a detection level to the first signal pin B, and the detection level is opposite to the normal ignition level output by the output pin of the second thermocouple sensor 107b. For example, when the normal ignition level of the second thermocouple sensor 107b is a high level output, the detection level at this time can be the ground level of the low logic level output. Or when the normal ignition level of the second thermocouple sensor 107b is a low level output, the detection level at this time can be a high level output.

Therefore, in an embodiment, the first signal pin B and the second signal pin D can alternately provide a detection level to detect another signal pin, and the control circuit 101 can detect the signal level of the first signal pin or the second signal pin Whether the level is the same as the detection level, if the detection result is yes, it can be determined that the component is abnormal, otherwise, if the detection result is negative, it can be determined that the component is normal.

Please refer to FIG. 5B . FIG. 5B is a flowchart of a method for detecting electricity by multiple thermocouples. The flow chart shown in FIG. 5B is illustrated by the architectures of FIG. 1 , FIG. 2 and FIG. 5A , but is not limited thereto. The process shown in FIG. 5B means that the control circuit performs element detection on the thermocouple sensor when executing the ignition detection program, for example, including the following steps.

In step S501, initialization. The detection level is provided to the detection pin X in the control circuit 101, and the levels of the first signal pin B and the second signal pin D are respectively read.

In step S503, it is detected whether there is a short circuit. The control circuit 101 judges whether the level of the first signal pin B or the second signal pin D is the same as the detection level. In this way, the output pin of the first thermocouple sensor 107a or the second thermocouple sensor 107b can be detected. Whether it is short-circuited with the adjacent detection pin X.

In step S505, abnormal. If the detection result of step S503 is yes, that is, when the level of the output pin of the first thermocouple sensor 107a or the second thermocouple sensor 107b is the detection level, the control circuit 101 can identify the first thermocouple sensor 107a Or the abnormal condition that the second thermocouple sensor 107b is short-circuited.

In step S507, close. When the control circuit 101 determines that there is an element abnormality in the first thermocouple sensor 107a or the second thermocouple sensor 107b, the control circuit 101 immediately shuts down the ignition, so that the fire can be turned off, thereby avoiding accidents of the gas furnace. The closing here can be, for example, the control circuit 101 closing the high-voltage ignition needle 105a and the gas solenoid valve body 107a to stop the subsequent combustion of the gas.

In step S509, it is determined whether the two thermocouple sensors are shorted to each other. Here, the control circuit 101 uses one of the first signal pin B and the second signal pin D as a detection pin to detect the other signal pin. For example, when the first signal pin B receives a detection level, if the control circuit 101 obtains that the level of the second signal pin D is equal to the detection level, then the first thermocouple sensor 107a and the second thermocouple sensor can be identified as 107b and other components are abnormal, otherwise, if the control circuit 101 obtains that the level of the second signal pin D is not equal to the detection level, it can be determined that the first thermocouple sensor 107a and the second thermocouple sensor 107b and other components are normal . On the other hand, when the second signal pin D receives a detection level, if the control circuit 101 obtains that the level of the first signal pin B is equal to the detection level, then the first thermocouple sensor 107a and the second thermocouple sensor 107a can be identified as The components such as the dual sensor 107b are abnormal. On the contrary, if the control circuit 101 obtains that the level of the first signal pin B is not equal to the detection level, the first thermocouple sensor 107a and the second thermocouple sensor 107b can be identified. Components are OK.

In step S511, normal. If the detection result of step S503 and step S509 is negative, that is, when the level of the output pin of the first thermocouple sensor 107a or the second thermocouple sensor 107b is not the detection level, the control circuit 101 can identify the first thermocouple sensor The detector 107a and the second thermocouple sensor 107b are not short-circuited.

In step S513, the combustion is continued. When the element is detected to be normal, the control circuit 101 can control the gas stove to continue burning without being affected.

In step S515, it is determined whether the thermocouple value is lower than the lower limit. The control circuit 101 can know whether the fire is off according to whether the thermocouple value of the first thermocouple sensor 107a or the second thermocouple sensor 107b is lower than the lower limit value. When step S515 judges otherwise, for example, it may go back to step S503 to continue execution. And when step S513 judges yes, then the control circuit 101 executes step S505 to determine that the fire may be abnormally turned off. The lower limit value mentioned here is, for example, a value at which the thermal sensing value can sense that the furnace is turned off.

Please refer to FIG. 5C . FIG. 5C is a detection waveform diagram of the thermocouple voltage in FIG. 5A . Figure 5C presents the thermocouple voltages of the first signal pin B and the second signal pin D (ie, the thermocouple value of the first thermocouple sensor 107a or the second thermocouple sensor 107b), wherein the first signal pin B and The second signal pin D is used in turn to provide the detection level as a low logic level (that is, the ground level) to be used as a similar detection pin. The first thermocouple sensor 107a or the second thermocouple sensor 107b works normally and outputs a thermocouple. The value is a high logic level (ie, 5V voltage).

From FIG. 5C, it can be known that the element abnormality of the first thermocouple sensor 107a or the second thermocouple sensor 107b did not occur in time intervals such as T0-T1, T1-T2, T2-T3, and T3-T4. Therefore, the levels of the first signal pin B and the second signal pin D both present the normal ignition level of the first thermocouple sensor 107a or the second thermocouple sensor 107b. After the time T4, the element abnormality of the first thermocouple sensor 107a or the second thermocouple sensor 107b occurs, so the level of the first signal pin B and the second signal pin D is the same as the detection level At this time, the control circuit 101 can determine that there is an abnormal short circuit between the first thermocouple sensor 107a and the second thermocouple sensor 107b.

[Example of detection of gas solenoid valve body]

Please refer to Figure 6A. Fig. 6A is a schematic diagram of detection of a gas solenoid valve body according to an embodiment of the present invention. The control circuit 101 has a driving pin E, a feedback pin H and a plurality of detection pins X, wherein the control circuit 101 is electrically connected to the solenoid valve control circuit 1091 through the driving pin E, and the control circuit 101 is electrically connected to the solenoid valve through the feedback pin H Detection loop 1093. The solenoid valve control circuit 1091 is electrically connected to the power supply 20 and the gas solenoid valve body 111a, and the solenoid valve detection circuit 1093 is electrically connected to the solenoid valve control circuit 1091 and the gas solenoid valve body 111a.

In one embodiment, the control circuit 101 provides a driving level (such as a high logic voltage level: 5V) to the solenoid valve control circuit 1091 through the driving pin E, and when the solenoid valve control circuit 1091 receives the driving level, it can The power supply circuit is turned on, so that the gas solenoid valve body 111a can automatically suck the valve to release the gas after receiving power from the power supply 20 . It is also worth noting that the control circuit 101 can also detect whether the solenoid valve detection circuit 1093 has received voltage through the feedback pin H.

For example, when the components are normal, when the control circuit 101 does not output the driving level to the solenoid valve control circuit 1091 through the driving pin E, the solenoid valve control circuit 1091 will not conduct the power supply 20 and the gas solenoid valve body at this time. The power supply circuit between 111a. That is to say, the solenoid valve detection circuit 1093 will not receive any voltage at this time. In addition, when there is an abnormality in the components, when the control circuit 101 does not output the drive level to the solenoid valve control circuit 1091 through the driving pin E, the solenoid valve control circuit 1091 may conduct the connection between the power supply 10 and the gas solenoid valve body due to abnormality. 111a's power supply circuit. That is to say, the solenoid valve detection circuit 1093 can receive voltage at this time, so the control circuit 101 can know this situation through the feedback pin H, and determine that there is an abnormal component, that is, the gas solenoid valve body 111a is in abnormal operation at this time .

Generally speaking, the control circuit 101 can know whether there is leakage through the above-mentioned detection method before the gas solenoid valve body 111a is used, so as to prevent the gas solenoid valve body 111a from continuously releasing gas due to the automatic suction valve caused by abnormal components. In addition, Figure 6a is an example of detection when the number of gas solenoid valves is one, but it is not limited to this. If the number of gas solenoid valves to be detected is large, it can also be detected through this framework. be repeated.

Please refer to FIG. 6B . FIG. 6B is a flowchart of a method for detecting a gas solenoid valve body. The flow chart shown in FIG. 6B is illustrated by the architectures of FIG. 1 , FIG. 2 and FIG. 6A , but is not limited thereto. The process shown in FIG. 6B means that the control circuit 101 performs element detection on the gas solenoid valve body when executing the ignition detection program, for example, including the following steps.

In step S601, initialization. A low level is provided to the driving pin E and the feedback pin H in the control circuit 101, and the level of the feedback pin H is read.

In step S603, whether electric leakage is detected. The control circuit 101 judges whether there is a voltage at the H position of the feedback pin, and through this method, it is possible to detect whether there may be a short circuit in the solenoid valve control circuit 1091 .

In step S605, abnormal. If the detection result of step S603 is yes, it means that there is an abnormality in the components of the solenoid valve control circuit 1091 .

In step S607, close. When the control circuit 101 determines that there is an abnormality in the solenoid valve control circuit 1091, the control circuit 101 immediately shuts down the ignition, so that the fire can be turned off, thereby avoiding accidents of the gas stove. The closing here can be, for example, the control circuit 101 closing the high-voltage ignition needle 105a and the gas solenoid valve body 107a to stop the subsequent combustion of the gas.

In step S609, normal. If the detection result of step S603 is negative, that is, the solenoid valve control circuit 1091 has no abnormal phenomenon of electric leakage, the control circuit 101 can determine that the solenoid valve control circuit 1091 and the gas solenoid valve body 111a are normal.

In step S611, the gas solenoid valve body 111a is turned on for ignition. When the component is detected to be normal, the control circuit 101 can control the driving pin E to output the driving level to the solenoid valve control circuit 1091, so that the solenoid valve control circuit 1091 can conduct the power supply circuit between the power supply 20 and the gas solenoid valve body 111a, that is, the gas The solenoid valve body 111a releases gas after opening the suction valve.

In step S613, the combustion is continued. When the element is detected to be normal, the control circuit 101 can control the gas stove to continue burning without being affected.

In step S615, it is determined whether the thermocouple value is lower than the lower limit. The control circuit 101 can know whether the fire is off according to whether the thermocouple value of the first thermocouple sensor 107a or the second thermocouple sensor 107b is lower than the lower limit value. When step S615 judges otherwise, for example, it may go back to step S603 to continue execution. And when the determination in step S615 is yes, the control circuit 101 executes step S605 to determine that the fire may be turned off abnormally. The lower limit value mentioned here is a value at which the thermal sensing value can sense the flame out of the furnace.

Please refer to FIG. 6C . FIG. 6C is a detection waveform diagram of the gas electromagnetic body in FIG. 6A . FIG. 6C shows the voltages of the driving pin E and the feedback pin H respectively, wherein the level of the driving pin E is a low logic level (that is, the ground level). From FIG. 6C , it can be known that the abnormal condition of the components of the solenoid valve control circuit 1091 does not occur during the time period T0-T1, so the feedback pin H does not receive voltage at this time. After the time T1, the abnormality of the components of the solenoid valve control circuit 1091 occurs, so the feedback pin H receives a voltage, and the control circuit 101 can determine that the solenoid valve control circuit 1091 has leakage component abnormalities.

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 detection system and the gas furnace ignition detection method provided by the present invention can actively detect whether there is an abnormality in the component through the detection of the component after the ignition is started, and can actively stop the subsequent ignition and combustion operation when the detection is abnormal, so as to avoid gas furnace failure. Component abnormality endangers the safety of operation.

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.

1: Gas stove 10: Gas furnace ignition detection system 101: Control circuit 103a, 103b micro switch 105a/105b: High voltage ignition needle 107a: First thermocouple sensor 107b: Second thermocouple sensor 109a/109b: main power supply circuit 1091: Solenoid valve control circuit 1093: Solenoid valve detection 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 X: detection foot B: The first signal pin D: The second signal pin H: Drive foot E: Feedback pin S301: start the gas switch S303: The micro switch is turned on S305: Power supply S307: Execute the ignition detection program S309: Component detection is normal S311: Ignition succeeded S313: Close the high-voltage ignition needle and keep the gas solenoid valve body S315: Close the high-voltage ignition needle and the gas solenoid valve body S401: Initialize S403: Detect whether there is a short circuit S405: Abnormal S407: close S409: Normal S411: Sustained burning S413: The thermocouple value is lower than the lower limit S501: Initialize S503: Whether it is short-circuited with the detection pin S505: Abnormal S507: close S509: Whether the two thermocouple sensors are shorted to each other S511: Normal S513: Sustained burning S515: The thermocouple value is lower than the lower limit S601: Initialize S603: Detect whether there is leakage S605: Abnormal S607: close S609: Normal S611: The gas solenoid valve body is opened to ignite S613: Sustained burning S615: The thermocouple value is lower than the lower limit

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 detection system provided by an embodiment of the present invention.

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

FIG. 4A is a schematic diagram of detection of a thermocouple sensor according to an embodiment of the present invention.

Fig. 4B is a flow chart of the thermocouple detection method.

Fig. 4C is a detection waveform diagram of the thermocouple voltage in Fig. 4A.

FIG. 5A is a schematic diagram of detection of multiple thermocouple sensors according to an embodiment of the present invention.

FIG. 5B is a flowchart of a method for electrical detection of multiple thermocouples.

FIG. 5C is a detection waveform diagram of multiple thermocouple voltages in FIG. 5A .

Fig. 6A is a schematic diagram of detection of a gas solenoid valve body according to an embodiment of the present invention.

Fig. 6B is a flowchart of a method for detecting a gas solenoid valve body.

Fig. 6C is a detection waveform diagram of the gas solenoid valve body in Fig. 6A.

S301: start the gas switch

S303: The micro switch is turned on

S305: Power supply

S307: Execute the ignition detection program

S309: Component detection is normal

S311: Ignition succeeded

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

S315: Close the high-voltage ignition needle and the gas solenoid valve body

Claims (10)

A gas stove ignition detection system, comprising: A micro switch is activated by a gas switch to conduct a power supply circuit; a high voltage ignition pin; A gas solenoid valve body; a first thermocouple sensor; and a control circuit electrically connected to the micro switch, the high voltage ignition pin, the gas solenoid valve body and the first 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 the ignition detection program after obtaining the power supply from the power supply circuit; When the control circuit executes the ignition detection program, it detects the first thermocouple sensor and at least one actuator of the gas solenoid valve body, and controls the high-voltage ignition needle, the gas solenoid valve body and the second gas solenoid valve according to the detection results. When a thermocouple sensor performs an ignition action; Wherein the control circuit stops the ignition action when the detection result of the actuator is abnormal. The gas furnace ignition detection system as described in Claim 1, wherein when the control circuit detects the actuator element of the first thermocouple sensor, a first signal pin of the control circuit and an output of the first thermocouple sensor The pins are electrically connected, and the detection pin adjacent to the first signal pin in the control circuit is the detection level. When the ignition action is executed, the control circuit judges that the first signal pin is the detection level instead of When the first thermocouple sensor outputs a normal ignition level, the control circuit determines that the detection result of the element is abnormal and stops the ignition action, wherein the detection level and the normal ignition level are opposite to each other. The gas furnace ignition detection system as described in claim 1 further includes a second thermocouple sensor, the second thermocouple sensor is electrically connected to the control circuit, wherein the control circuit is connected to the first thermocouple sensor and When the second thermocouple sensor implements element detection, a first signal pin of the control circuit is electrically connected to an output pin of the first thermocouple sensor, and a second signal pin of the control circuit is connected to the second An output pin of the thermocouple sensor is electrically connected, and the first signal pin and the second signal pin are adjacent to each other, and the detection pin adjacent to the first signal pin and the second signal pin in the control circuit is Detection level, when the ignition action is executed, and the control circuit controls one of the output pins of the first thermocouple sensor and the second thermocouple sensor to be the normal ignition level and the other output pin to be the detection level When the control circuit judges that both the first signal pin and the second signal pin show the detection level, the control circuit determines that the result of component detection is abnormal and stops the ignition action, wherein the detection level is the same as the normal ignition level Bits are opposite to each other. The gas furnace ignition detection system as described in claim 1 further includes a solenoid valve control circuit and a solenoid valve detection circuit, wherein the solenoid valve control circuit supplies power to the gas solenoid valve body according to a power supply, and the control circuit is electrically Connect the solenoid valve control circuit and the solenoid valve detection circuit, the solenoid valve detection circuit is electrically connected to the solenoid valve control circuit, wherein when the control circuit performs the ignition action, it first detects the gas solenoid valve body, and then When the detection is normal, start to control the solenoid valve control loop to supply power to the gas solenoid valve body, and stop the ignition action when the detection result is abnormal. The gas furnace ignition detection system as described in claim 4, wherein when the control circuit first detects the gas solenoid valve body, the control circuit controls the solenoid valve control circuit to stop supplying power to the gas solenoid valve body, and detects the gas solenoid valve body The solenoid valve detects whether there is voltage generated in the circuit. If it is detected, it is determined that the component detection result is abnormal, and if it is not detected, it is determined that the component detection result is normal. A gas stove ignition detection method, comprising: When a micro switch of the gas stove is contacted by a gas switch of the gas stove, a power supply circuit is turned on; and When a control circuit of the gas stove obtains power from the power supply circuit, it automatically executes an ignition detection procedure; Wherein the control circuit detects a first thermocouple sensor of the gas furnace and at least one actuator of a gas electromagnetic valve body of the gas furnace when executing the ignition detection program, and controls the gas furnace according to the detection results When a high-voltage ignition needle, the gas solenoid valve body and the first thermocouple sensor perform an ignition action; Wherein the control circuit stops the ignition action when the detection result of the actuator is abnormal. The gas furnace ignition detection method as described in claim 6, wherein the control circuit includes the following steps when performing element detection on the first thermocouple sensor: electrically connecting a first signal pin of the control circuit to an output pin of the first thermocouple sensor; making the detection pin adjacent to the first signal pin in the control circuit the detection level; When the ignition action is executed, when the control circuit judges that the first signal pin is at the detection level instead of the normal ignition level output by the first thermocouple sensor, the control circuit determines that the detection result of the element is abnormal and stops the Ignition action. The gas furnace ignition detection method as described in claim 6, wherein when the control circuit performs element detection on the first thermocouple sensor, the steps are as follows: electrically connecting a first signal pin of the control circuit to an output pin of the first thermocouple sensor; A second signal pin of the control circuit is electrically connected to an output pin of the second thermocouple sensor, and the first signal pin and the second signal pin are adjacent to each other; Make the detection pin adjacent to the first signal pin and the second signal pin in the control circuit be the detection level; When the ignition action is performed, and the control circuit controls one of the output pins of the first thermocouple sensor and the second thermocouple sensor to be the normal ignition level and the other output pin is the detection level, if the When the control circuit judges that both the first signal pin and the second signal pin show the detection level, the control circuit determines that the result of component detection is abnormal and stops the ignition action. The gas furnace ignition detection method as described in claim 6, wherein when the control circuit detects the actuator of the gas solenoid valve body, the steps include the following steps: The control circuit is electrically connected to a solenoid valve control circuit and a solenoid valve detection circuit, and the solenoid valve detection circuit is electrically connected to a solenoid valve control circuit, wherein the solenoid valve control circuit controls the gas solenoid valve body according to a power supply powered by; When the control circuit performs the ignition action, it first detects the gas solenoid valve body, and starts to control the solenoid valve control circuit to supply power to the gas solenoid valve body when the detection is normal; and When the detection result is abnormal, the ignition action is stopped. The gas furnace ignition detection method as described in Claim 9, wherein when the control circuit first detects the gas solenoid valve body, the control circuit controls the solenoid valve control circuit to stop supplying power to the gas solenoid valve body, and detects the gas solenoid valve body. The solenoid valve detects whether there is voltage generated in the circuit. If it is detected, it is determined that the component detection result is abnormal, and if it is not detected, it is determined that the component detection result is normal.

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