A gas appliance and ignition control method

Abstract

The application relates to a gas equipment and a ignition control method, comprising a controller unit, a safety valve control unit, a flame detection unit, an ignition unit and an interlocking unit; the flame detection unit is used for detecting a flame existing state of the gas equipment; the ignition unit is used for igniting the gas equipment; the safety valve control unit is used for controlling combustible gas supply to the gas equipment; the controller unit is used for controlling the conduction state of the interlocking unit according to the flame existing state and the ignition state of the ignition unit, and when the interlocking unit is conducted, the control signal output by the controller unit is transmitted through the interlocking unit to control the safety valve control unit to open. It can be seen that the application adopts a combination of software and hardware to control the opening of the safety valve control unit. Even if the flame is extinguished after the gas equipment is successfully ignited, the interlocking unit cannot be conducted, thereby realizing the cutting-off of the gas passage and effectively improving the reliability of the safety valve control scheme of the gas equipment.

Description

Technical Field

[0001] This application relates to the field of gas equipment, and more particularly to a gas equipment and an ignition control method. Background Technology

[0002] As people's living standards continue to improve, gas appliances are being used more and more widely in heating, domestic hot water supply, and other fields. Users are also placing higher demands on the safety performance of these appliances. The industry generally uses safety valves in gas appliances for safety management to ensure their safe operation.

[0003] Currently, most safety valve control schemes for gas appliances employ a purely hardware architecture. Specifically, the opening and closing of the safety valve are achieved through relays, single transistors, or simple gate circuits, with signal acquisition and logic judgment processes entirely dependent on hardware circuitry.

[0004] However, pure hardware architecture solutions have reliability shortcomings. After long-term and repeated use, the internal hardware components of gas appliances are prone to aging or damage; for example, if the gas appliance ignites successfully, but the flame is extinguished due to hardware component failure, the gas supply cannot be cut off in time, which can easily lead to safety risks such as gas leaks and explosions. Summary of the Invention

[0005] This application provides a gas appliance and an ignition control method, aiming to solve the technical problem of low reliability caused by the fact that the existing gas appliance safety valve control scheme relies entirely on hardware circuits.

[0006] In a first aspect, embodiments of this application provide a gas appliance, including: The system includes a controller unit, a safety valve control unit, a flame detection unit, an ignition unit, and an interlock unit, wherein the interlock unit is electrically connected to the controller unit, the safety valve control unit, the flame detection unit, and the ignition unit, respectively; and the controller unit is electrically connected to the flame detection unit and the ignition unit, respectively. The flame detection unit is used to detect the presence of flame in the gas equipment. The ignition unit is used to ignite the gas equipment; The safety valve control unit is used to control the supply of combustible gas to the gas equipment; The controller unit is used to control the conduction state of the interlock unit according to the flame presence state and the ignition state of the ignition unit. When the interlock unit is on, the control signal output by the controller unit is transmitted through the interlock unit to control the safety valve control unit to open.

[0007] Optionally, the interlocking unit includes a first circuit unit, a second circuit unit, a transistor, and a filter capacitor, and the controller unit includes a first port, a second port, and a third port; One end of the first circuit unit is electrically connected to the ignition unit and the first port, respectively; One end of the second circuit unit is electrically connected to the flame detection unit and the second port, respectively. The other end of the second circuit unit is connected in parallel with the other end of the first circuit unit to form a parallel node. The parallel node is electrically connected to the base of the transistor. The base of the transistor is connected in series with the filter capacitor, the emitter of the transistor is electrically connected to the third port, and the collector of the transistor is electrically connected to the safety valve control unit. The end of the filter capacitor furthest from the base of the transistor is grounded.

[0008] Optionally, the first circuit unit includes a first current-limiting resistor and a first diode; One end of the first current-limiting resistor is electrically connected to the ignition unit and the first port, respectively; the other end of the first current-limiting resistor is electrically connected to the cathode of the first diode. The anode of the first diode is connected in parallel with the other end of the second circuit unit to form the parallel node.

[0009] Optionally, the second circuit unit includes a second current-limiting resistor and a second diode; One end of the second current-limiting resistor is electrically connected to the flame detection unit and the second port, respectively, and the other end of the second current-limiting resistor is electrically connected to the cathode of the second diode. The anodes of the first diode and the second diode are connected in parallel to form the parallel node.

[0010] Optionally, the transistor is a PNP field-effect transistor.

[0011] Optionally, the gas equipment further includes a safety valve overcurrent protection unit, which is connected to the safety valve control unit and is used to provide overcurrent protection for the safety valve control unit.

[0012] Optionally, the size of the filter capacitor is 10-100nF.

[0013] Secondly, embodiments of this application provide an ignition control method, the method being applied to the gas appliance as described in the first aspect, comprising: The first flame presence state of the gas device is obtained, and the first flame presence state is detected by the flame detection unit. If the first flame presence state indicates that the gas device does not have a flame, then the controller unit controls the ignition unit to perform an ignition operation on the gas device; After the ignition operation is triggered, the control unit outputs a control signal, which is used to control the safety valve control unit to open.

[0014] Optionally, after the control unit outputs the control signal, the method further includes: The second flame presence state of the gas device is obtained, and the second flame presence state is detected by the flame detection unit. If the presence of the second flame indicates that the gas device does not have a flame, then determine whether the ignition time of the ignition unit is greater than the preset ignition time. If the ignition duration of the ignition unit is less than the preset ignition duration, then return to the step of "If the first flame existence state indicates that the gas device does not have a flame, then the controller unit controls the ignition unit to perform an ignition operation on the gas device". If the ignition duration of the ignition unit is greater than or equal to the preset ignition duration, the controller unit controls the ignition unit to prevent it from igniting the gas equipment, and the controller unit stops outputting the control signal.

[0015] Optionally, the method further includes: If the second flame presence state indicates that the gas device has a flame, then according to the preset combustion process, the third flame presence state of the gas device is obtained, and the third flame presence state is detected by the flame detection unit. If the presence of the third flame indicates that the gas device does not have a flame, the controller unit controls the ignition unit to prevent ignition of the gas device, and the controller unit stops outputting the control signal.

[0016] Optionally, the method further includes: If the first flame presence state of the gas appliance indicates that the gas appliance has a flame, an alarm will be issued.

[0017] Thirdly, embodiments of this application also provide a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the above-described method.

[0018] Fourthly, embodiments of this application also provide a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the above-described method.

[0019] This application provides a gas appliance and an ignition control method. The device includes a controller unit, a safety valve control unit, a flame detection unit, an ignition unit, and an interlock unit. The interlock unit is electrically connected to the controller unit, the safety valve control unit, the flame detection unit, and the ignition unit. The controller unit is electrically connected to the flame detection unit and the ignition unit. The flame detection unit detects the presence of a flame in the gas appliance. The ignition unit ignites the gas appliance. The safety valve control unit controls the supply of combustible gas to the gas appliance. The controller unit controls the conduction state of the interlock unit based on the flame presence state and the ignition state of the ignition unit. When the interlock unit is on, the control signal output by the controller unit is transmitted through the interlock unit to control the opening of the safety valve control unit. Therefore, this application's technical solution uses a combination of hardware and software to control the opening of the safety valve control unit. Specifically, this application uses a flame detection unit to detect the flame presence status of the gas appliance and obtain the ignition status of the ignition unit. Based on the flame presence and ignition status, it controls the conduction status of the interlock unit. When the interlock unit is activated, the control signal output by the controller unit is transmitted through the interlock unit to control the safety control unit to open. Therefore, even if the flame extinguishes after successful ignition of the gas appliance, the interlock unit cannot be activated, thereby cutting off the gas supply and effectively improving the reliability of the gas appliance safety valve control scheme. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0023] Figure 1a One of the schematic block diagrams of a gas appliance provided in this application embodiment; Figure 1b A schematic block diagram of a controller unit provided in an embodiment of this application; Figure 1c A schematic block diagram of a flame detection unit provided in an embodiment of this application; Figure 1d A schematic block diagram of an ignition unit provided in an embodiment of this application; Figure 1e A schematic block diagram of an interlocking unit provided in an embodiment of this application; Figure 1f A schematic block diagram of another interlocking unit provided in an embodiment of this application; Figure 1g This is a second schematic block diagram of a gas appliance provided in an embodiment of this application; Figure 1h This application provides a schematic diagram of the structure of a safety valve overcurrent protection unit according to an embodiment of the present application. Figure 1i This is a third schematic block diagram of a gas appliance provided in the embodiments of this application; Figure 2a One of the flowcharts of an ignition control method provided in this application embodiment; Figure 2b A second schematic flowchart illustrating an ignition control method provided in an embodiment of this application; Figure 2c A schematic diagram of a normal combustion process provided for an embodiment of this application; Figure 3 A computer device provided in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures: 100, Controller Unit; 200, Safety Valve Control Unit; 300, Flame Detection Unit; 400, Ignition Unit; 500, Interlock Unit; 600, Safety Valve Overcurrent Protection Unit; Q1, Transistor; 501, First Circuit Unit; 502, Second Circuit Unit; C1, Filter Capacitor; R1, First Current Limiting Resistor; R2, Second Current Limiting Resistor; D1, First Diode; D2, Second Diode. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0027] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0028] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0029] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0030] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0031] In order to solve the technical problem of low reliability caused by the fact that the safety valve control scheme of gas equipment relies entirely on hardware circuits in the prior art, this application provides a gas equipment that can improve the reliability of gas equipment safety valve control.

[0032] Figure 1a This is a schematic block diagram of a gas appliance provided for an embodiment of this application. In one embodiment, the gas appliance includes: The system includes a controller unit 100, a safety valve control unit 200, a flame detection unit 300, an ignition unit 400, and an interlock unit 500, wherein the interlock unit 500 is electrically connected to the controller unit 100, the safety valve control unit 200, the flame detection unit 300, and the ignition unit 400, respectively; and the controller unit 100 is electrically connected to the flame detection unit 300 and the ignition unit 400, respectively. The flame detection unit 300 is used to detect the presence of flame in the gas equipment; The ignition unit 400 is used to ignite the gas equipment; The safety valve control unit 200 is used to control the supply of combustible gas to the gas equipment; The controller unit 100 is used to control the conduction state of the interlock unit 500 according to the flame presence state and the ignition state of the ignition unit 400. When the interlock unit 500 is on, the control signal output by the controller unit 100 is transmitted through the interlock unit 500 to control the safety valve control unit 200 to open.

[0033] It should be noted that the controller unit 100 is a control unit that includes an MCU.

[0034] Please see Figures 1b-1d , Figure 1b This is a schematic block diagram of a controller unit provided in an embodiment of this application. Figure 1c This is a schematic block diagram of a flame detection unit provided in an embodiment of this application. Figure 1dThis is a schematic block diagram of an ignition unit provided in an embodiment of this application. The MCU includes multiple pins, which are respectively connected to the flame detection unit 300, the ignition unit 400, and the interlock unit 500. Specifically, the MCU includes three pins: HY_I_AD, KGF_O_CTL, and DH_O_GP. The HY_I_AD pin is connected to the flame detection unit 300, the DH_O_GP pin is connected to the ignition unit 400, and the HY_I_AD, KGF_O_CTL, and DH_O_GP pins are all connected to different pins in the interlock unit 500. The gas device also includes a combustion unit. The flame detection unit 300 includes a flame sensing needle, which is used to sense whether a flame appears on the combustion unit. The presence of a flame in the gas device indicates whether a flame exists on the combustion unit. The ignition unit 400 includes a discharge needle, which emits current when triggered by a high-level signal to ignite the gas device. The combustible gas can be natural gas or other combustible gases; this application does not impose any limitations on this. The interlock unit 500 has two operating states: an on state and a closed state. When the interlock unit 500 is in the on state, the control information output by the control unit can be transmitted through the interlock unit 500 and input to the safety valve control unit 200 to open the safety valve control unit 200. Furthermore, the state of the interlock unit 500 is affected by the presence of a flame and the ignition state of the ignition unit 400. This application controls the ignition of the ignition unit 400 by combining the detected flame presence state, thereby controlling the on state of the interlock unit 500.

[0035] This application provides a gas appliance. The appliance includes: a controller unit 100, a safety valve control unit 200, a flame detection unit 300, an ignition unit 400, and an interlock unit 500. The interlock unit 500 is electrically connected to the controller unit 100, the safety valve control unit 200, the flame detection unit 300, and the ignition unit 400. The controller unit 100 is electrically connected to both the flame detection unit 300 and the ignition unit 400. The flame detection unit 300 detects the presence of a flame in the gas appliance. The ignition unit 400 ignites the gas appliance. The safety valve control unit 200 controls the supply of combustible gas to the gas appliance. The controller unit 100 controls the conduction state of the interlock unit 500 based on the flame presence state and the ignition state of the ignition unit 400. When the interlock unit 500 is on, the control signal output by the controller unit 100 is transmitted through the interlock unit 500 to control the safety valve control unit 200 to open. Therefore, the technical solution of this application adopts a combination of hardware and software to control the opening of the safety valve control unit 200. Specifically, this application uses the flame detection unit 300 to detect the flame presence status of the gas equipment and obtain the ignition status of the ignition unit 400. Then, based on the flame presence status and ignition status, it controls the conduction status of the interlock unit 500. When the interlock unit 500 is on, the control signal output by the controller unit 100 is transmitted through the interlock unit 500 to control the opening of the safety control unit. Therefore, even if the flame is extinguished after successful ignition of the gas equipment, the interlock unit 500 cannot be activated, thereby cutting off the gas passage and effectively improving the reliability of the gas equipment safety valve control scheme.

[0036] Please see Figure 1e , Figure 1e This is a schematic block diagram of an interlocking unit provided in an embodiment of this application. In one embodiment, the interlocking unit 500 includes a first circuit unit 501, a second circuit unit 502, a transistor Q1, and a filter capacitor C1, and the controller unit 100 includes a first port, a second port, and a third port; One end of the first circuit unit 501 is electrically connected to the ignition unit 400 and the first port, respectively; One end of the second circuit unit 502 is electrically connected to the flame detection unit 300 and the second port respectively. The other end of the second circuit unit 502 is connected in parallel with the other end of the first circuit unit 501 to form a parallel node. The parallel node is electrically connected to the base of the transistor Q1. The base of transistor Q1 is connected in series with the filter capacitor C1, the emitter of transistor Q1 is electrically connected to the third port, and the collector of transistor Q1 is electrically connected to the safety valve control unit 200. The end of the filter capacitor C1 that is furthest from the base of the transistor Q1 is grounded.

[0037] It should be noted that, preferably, transistor Q1 is a PNP field-effect transistor with an amplification factor β = 100-200, a forward voltage drop ≤ 0.2V to ensure distortion-free transmission of control signals, and a leakage current ≤ 1μA when cut off to avoid signal crosstalk.

[0038] The filter capacitor C1 is preferably a ceramic capacitor, which has good high-frequency characteristics and can filter out high-frequency interference above 20kHz, preventing the interlock node level from floating and causing the transistor Q1 to malfunction. Furthermore, the size of the filter capacitor C1 is 10-100nF.

[0039] In addition, such as Figure 1e As shown, one end of the first circuit unit 501 is the DH_O_GP port. One end of the second circuit unit 502 is the DH_I_AD port. The port connected to the emitter of transistor Q1 is the KGF_O_CTL port, and the port connected to the collector of transistor Q1 is the KGF port.

[0040] In this embodiment, the control signal is transmitted by turning on and off the transistor Q1. When the transistor Q1 is turned on, the control signal is input to the safety valve control unit 200 through the transistor Q1, thereby opening the safety valve control unit 200.

[0041] Please see Figure 1f , Figure 1f This is a schematic block diagram of another interlocking unit provided in an embodiment of this application. In one embodiment, the first circuit unit 501 includes a first current-limiting resistor R1 and a first diode D1; One end of the first current-limiting resistor R1 is electrically connected to the ignition unit 400 and the first port, respectively; the other end of the first current-limiting resistor R1 is electrically connected to the cathode of the first diode D1. The anode of the first diode D1 is connected in parallel with the other end of the second circuit unit 502 to form the parallel node.

[0042] In one embodiment, the second circuit unit 502 includes a second current-limiting resistor R2 and a second diode D2; One end of the second current-limiting resistor R2 is electrically connected to the flame detection unit 300 and the second port, respectively, and the other end of the second current-limiting resistor R2 is electrically connected to the cathode of the second diode D2. The anodes of the first diode D1 and the second diode D2 are connected in parallel to form the parallel node.

[0043] It should be noted that when one end of the first current-limiting resistor R1 or one end of the second current-limiting resistor R2 is at a low level, transistor Q1 is in the conducting state. When one end of the first current-limiting resistor R1 or one end of the second current-limiting resistor R2 is at a high level, transistor Q1 is in the cutoff state.

[0044] It should be noted that the first current-limiting resistor R1 is matched with the first diode D1. Preferably, the first current-limiting resistor R1 is 10K ohms, limiting the signal current to less than or equal to 0.5mA, to prevent the first diode D1 or transistor Q1 from being damaged by overcurrent. The first diode D1 is a switching diode, and the model can be 1N4148, to ensure fast level switching of the interlock node and improve the response speed.

[0045] In addition, the second current-limiting resistor R2 is matched with the second diode D2. Preferably, the second current-limiting resistor R2 is 10K ohms, limiting the signal current to less than or equal to 0.5mA, to prevent the second diode D2 or transistor Q1 from being damaged by overcurrent. The second diode D2 is a switching diode, which can be a 1N4148 type, and the interlock node level switching is fast, improving the response speed.

[0046] Please see Figure 1g , Figure 1g This is a second schematic block diagram of a gas appliance provided in an embodiment of this application. In one embodiment, the gas appliance further includes a safety valve overcurrent protection unit 600, which is connected to the safety valve control unit 200 and is used to provide overcurrent protection for the safety valve control unit 200.

[0047] For details, please refer to Figure 1h , Figure 1h This is a schematic diagram of a safety valve overcurrent protection unit provided in an embodiment of this application. VPP is the power supply for the safety valve, providing power to the safety valve control unit 200. The safety valve control unit 200 has three pins: one pin is connected to the KGF port of the interlock unit, and the other two pins are connected to the safety valve overcurrent protection unit 600. One pin is VPP_IN, and the other pin is connected to resistor R4 and grounded. Transistor Q3 controls the opening and closing of the power supply VPP. The working process of the safety valve overcurrent protection unit 600 is described below.

[0048] When no overcurrent occurs in the safety valve control unit 200, the current flowing through resistor R4 is relatively small. Therefore, the voltage at the base of transistor Q2 is small and insufficient to trigger transistor Q2 to conduct. Transistor Q3 is controlled by the POWER_CTL port of the controller unit 100. When POWER_CTL is high, transistor Q3 conducts, and transistor Q4 also conducts. The safety valve power supply VPP supplies power to the safety valve control unit 200. When POWER_CTL is low, transistor Q3 is cut off, and transistor Q4 is also cut off, disconnecting the safety valve power supply and stopping the safety valve control unit 200 from operating.

[0049] When an overcurrent occurs in the safety valve control unit 200, the current flowing through resistor R4 is relatively large, and this voltage is sufficient to trigger transistor Q2 to conduct. At this time, regardless of the POWER_CTL state of the controller unit 100, transistors Q3 and Q4 are both in the off state. The safety valve power supply VPP is disconnected, and the safety valve control unit 200 stops working.

[0050] Please see Figure 1i , Figure 1i This is a third schematic block diagram of a gas appliance provided in this application. The safety valve control circuit is a safety valve control unit 200, the flame detection module circuit is a flame detection unit 300, the ignition circuit is an ignition unit 400, and the MCU is a controller unit 100. The working principle of this circuit has been described in detail in the above embodiments. Therefore, it will not be repeated here.

[0051] Please see Figure 2a , Figure 2a This is a flowchart illustrating one of the ignition control methods provided in this application embodiment. The method is applied to the aforementioned gas equipment and includes steps S201-S203.

[0052] S201. Obtain the first flame presence status of the gas equipment.

[0053] The presence of the first flame is detected by the flame detection unit 300. The presence of the first flame is determined by the flame detection unit 300, which detects whether a flame exists on the combustion unit. Specifically, in this embodiment, the presence of an open flame can be determined by detecting whether one end of the first circuit unit 501 is at a low level. If one end of the first circuit unit 501 is at a low level, it indicates that there is a flame on the combustion unit. If one end of the first circuit unit 501 is at a high level, it indicates that there is no flame on the combustion unit.

[0054] S202. If the first flame presence state indicates that the gas equipment does not have a flame, then the controller unit controls the ignition unit to ignite the gas equipment.

[0055] It should be noted that if an open flame is detected in the gas appliance before igniting it, it indicates a gas leak. In this case, ignition should not be turned on directly. The cause of the gas leak must be detected beforehand, and ignition can only be attempted after the gas leak has been resolved.

[0056] In this embodiment, the ignition unit 400 ignites the gas device by setting one end of the first circuit unit 501 to a low level. Specifically, when one end of the first circuit unit 501 is at a low level, the ignition unit 400 begins to discharge. The combustible gas is then combusted under the influence of this current.

[0057] S203, The control unit outputs control signals.

[0058] The control signal is transmitted through the interlock unit and is used to control the safety valve control unit 200 to open.

[0059] Preferably, the control signal is a pulse-modulated signal. In this embodiment, the safety valve drive unit is controlled by the control signal to open the safety valve.

[0060] In one embodiment, after S203, the method further includes S204-S207.

[0061] S204. Obtain the status of the second flame of the gas equipment.

[0062] The presence of the second flame is detected by the flame detection unit 300.

[0063] It should be noted that S204 is the same as or similar to S201. This application will not elaborate further on this.

[0064] S205. If the presence of the second flame indicates that the gas equipment does not have a flame, then determine whether the ignition duration of the ignition unit is greater than the preset ignition duration.

[0065] The preset ignition duration is the preset discharge duration set for the ignition unit 400 in this embodiment of the application. Since the software execution speed is at the nanosecond level, the preset discharge duration is preferably at the millisecond level. In addition, the preset discharge duration is calculated based on the combustion chamber volume of the gas equipment, which ensures both the ignition success rate (≥99.5%) and avoids excessive gas accumulation (leakage <0.01m³ / h). S206 If the ignition duration of the ignition unit is less than the preset ignition duration, then return to step S202.

[0066] S207. If the ignition duration of the ignition unit is greater than or equal to the preset ignition duration, the controller unit controls the ignition unit to prevent it from igniting the gas equipment, and the controller unit stops outputting control signals.

[0067] It should be noted that S206-S207 will be explained in detail below.

[0068] Since the safety valve control unit 200 is in the open state during the continuous discharge of the ignition unit 400, in other words, combustible gas is released through the safety valve during the continuous discharge of the ignition unit 400. To prevent the safety risk caused by excessive accumulation of combustible gas due to prolonged ignition, in this embodiment, if the ignition duration of the ignition unit 400 is greater than or equal to a preset ignition duration, the controller unit 100 controls the ignition unit 400 to prohibit ignition of the gas equipment, and the controller unit 100 stops outputting control signals to prevent excessive accumulation of combustible gas from causing safety risks. If the ignition duration of the ignition unit 400 is less than the preset ignition duration, the process returns to step S202.

[0069] In one embodiment, the method further includes: S208-S209.

[0070] S208. If the second flame presence status indicates that the gas device has a flame, then according to the preset combustion process, obtain the third flame presence status of the gas device.

[0071] The presence of the third flame is detected by the flame detection unit 300.

[0072] S209. If the presence of a third flame indicates that the gas equipment does not have a flame, the controller unit controls the ignition unit to prevent ignition of the gas equipment, and the controller unit stops outputting control signals.

[0073] It should be noted that S208-S209 will be explained in detail below.

[0074] When the presence of a second flame indicates that a flame exists in the gas appliance, the gas appliance enters a preset combustion process. During combustion, the presence of a flame on the combustion unit is continuously monitored. If the flame on the combustion unit is detected to be extinguished, the ignition unit 400 is controlled to prevent ignition of the gas appliance, and the output of control signals is simultaneously stopped, so that the safety valve control unit 200 is closed. In other words, the output of combustible gas from the gas appliance is shut off.

[0075] In one embodiment, the method further includes: S210.

[0076] S210. If the presence of the first flame in the gas appliance indicates that there is a flame in the gas appliance, an alarm shall be issued.

[0077] When the first flame state of a gas appliance indicates that a gas leak has occurred, it means that the gas appliance is leaking gas and an alarm needs to be issued in time to notify relevant personnel to intervene and handle the situation.

[0078] Please see Figure 2b , Figure 2b This is a second schematic flowchart of an ignition control method provided in this application embodiment. When the gas appliance starts ignition, it first checks whether the voltage of the HY_I_AD pin is low. If the voltage of the HY_I_AD pin is low, it indicates that the gas appliance has a flame. At this time, the ignition unit 400 cannot be controlled to start discharging; instead, ignition needs to be stopped, and a warning is issued to relevant personnel to facilitate intervention. When the gas appliance has no flame, the voltage of the DH_O_GP pin is controlled to be low. At this time, the ignition unit 400 starts discharging under the action of the low voltage of the DH_O_GP pin. Next, the KGF_O_CTL port of the MCU continuously outputs a PWM control signal. This control signal controls the safety valve control unit 200 to open the safety valve through the interlock unit 500, so that the gas appliance releases combustible gas. Furthermore, the gas appliance needs to detect the voltage of HY_I_AD to determine whether the gas appliance has a flame. If there is a flame, it enters the normal combustion process. If there is no flame, the system continues to check whether the discharge time of the ignition unit 400 has reached the preset discharge duration. If it has not, the system returns to perform the ignition operation; otherwise, an ignition failure message is displayed, and the DH_O_GP pin is set to a high level and the KGF_O_CTL pin to a low level. In other words, the ignition is turned off and the safety valve is closed, and the ignition process is exited.

[0079] Please see Figure 2c , Figure 2c This is a schematic diagram of a normal combustion process provided in an embodiment of this application. During normal combustion in the gas appliance, it is necessary to continuously monitor whether the flame is extinguished. If the flame is unexpectedly extinguished, an unexpected flameout fault needs to be reported, and the DH_O_GP pin is controlled to be high and the KGF_O_CTL pin is controlled to be low. In other words, at this time, the ignition is turned off and the safety valve is closed, and the normal combustion process is exited.

[0080] like Figure 3 As shown, this application provides a computer device including a processor 31, a communication interface 32, a memory 33, and a communication bus 34. The processor 31, the communication interface 32, and the memory 33 communicate with each other through the communication bus 34. The memory 33 is used to store computer programs. In one embodiment of this application, the processor 31, when executing the program stored in the memory 33, implements the ignition control method provided in any of the foregoing method embodiments.

[0081] It will be understood by those skilled in the art that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program may be stored in a storage medium, which is a computer-readable storage medium. The computer program is executed by at least one processor in the computer system to implement the process steps of the embodiments of the above methods.

[0082] Therefore, embodiments of this application also provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the ignition control method provided in any of the foregoing method embodiments.

[0083] The storage medium is a physical, non-transient storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), magnetic disk, or optical disk, or any other physical storage medium capable of storing program code. The computer-readable storage medium can be non-volatile or volatile.

[0084] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this application.

[0085] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For example, the division of each unit is merely a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0086] The steps in the methods of this application embodiment can be adjusted, merged, or deleted according to actual needs. The units in the apparatus of this application embodiment can be merged, divided, or deleted according to actual needs. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0087] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a terminal, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0088] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0089] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0090] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A gas-fired device, characterized in that, include: The system includes a controller unit, a safety valve control unit, a flame detection unit, an ignition unit, and an interlock unit, wherein the interlock unit is electrically connected to the controller unit, the safety valve control unit, the flame detection unit, and the ignition unit, respectively; and the controller unit is electrically connected to the flame detection unit and the ignition unit, respectively. The flame detection unit is used to detect the presence of flame in the gas equipment. The ignition unit is used to ignite the gas equipment; The safety valve control unit is used to control the supply of combustible gas to the gas equipment; The controller unit is used to control the conduction state of the interlock unit according to the flame presence state and the ignition state of the ignition unit. When the interlock unit is on, the control signal output by the controller unit is transmitted through the interlock unit to control the safety valve control unit to open.

2. The gas appliance according to claim 1, characterized in that, The interlocking unit includes a first circuit unit, a second circuit unit, a transistor, and a filter capacitor; the controller unit includes a first port, a second port, and a third port. One end of the first circuit unit is electrically connected to the ignition unit and the first port, respectively; One end of the second circuit unit is electrically connected to the flame detection unit and the second port, respectively. The other end of the second circuit unit is connected in parallel with the other end of the first circuit unit to form a parallel node. The parallel node is electrically connected to the base of the transistor. The base of the transistor is connected in series with the filter capacitor, the emitter of the transistor is electrically connected to the third port, and the collector of the transistor is electrically connected to the safety valve control unit. The end of the filter capacitor furthest from the base of the transistor is grounded.

3. The gas equipment according to claim 2, characterized in that, The first circuit unit includes a first current-limiting resistor and a first diode; One end of the first current-limiting resistor is electrically connected to the ignition unit and the first port, respectively; the other end of the first current-limiting resistor is electrically connected to the cathode of the first diode. The anode of the first diode is connected in parallel with the other end of the second circuit unit to form the parallel node.

4. The gas appliance according to claim 3, characterized in that, The second circuit unit includes a second current-limiting resistor and a second diode; One end of the second current-limiting resistor is electrically connected to the flame detection unit and the second port, respectively, and the other end of the second current-limiting resistor is electrically connected to the cathode of the second diode. The anodes of the first diode and the second diode are connected in parallel to form the parallel node.

5. The gas appliance according to any one of claims 2 to 4, characterized in that, The transistor is a PNP field-effect transistor.

6. The gas appliance according to any one of claims 1 to 4, characterized in that, The gas equipment also includes a safety valve overcurrent protection unit, which is connected to the safety valve control unit and is used to provide overcurrent protection for the safety valve control unit.

7. An ignition control method, characterized in that, The method is applied to the gas appliance as described in any one of claims 1 to 6, and the method comprises: The first flame presence state of the gas device is obtained, and the first flame presence state is detected by the flame detection unit. If the presence of the first flame indicates that the gas device does not have a flame, then the controller unit controls the ignition unit to perform an ignition operation on the gas device; After the ignition operation is triggered, the control unit outputs a control signal, which is used to control the safety valve control unit to open.

8. The method according to claim 7, characterized in that, After the control unit outputs the control signal, the method further includes: The second flame presence state of the gas device is obtained, and the second flame presence state is detected by the flame detection unit. If the presence of the second flame indicates that the gas device does not have a flame, then determine whether the ignition time of the ignition unit is greater than the preset ignition time. If the ignition duration of the ignition unit is less than the preset ignition duration, then return to the step of "If the first flame existence state indicates that the gas device does not have a flame, then the controller unit controls the ignition unit to perform an ignition operation on the gas device"; If the ignition duration of the ignition unit is greater than or equal to the preset ignition duration, the controller unit controls the ignition unit to prevent it from igniting the gas equipment, and the controller unit stops outputting the control signal.

9. The method according to claim 8, characterized in that, The method further includes: If the second flame presence state indicates that the gas device has a flame, then according to the preset combustion process, the third flame presence state of the gas device is obtained, and the third flame presence state is detected by the flame detection unit. If the presence of the third flame indicates that the gas device does not have a flame, the controller unit controls the ignition unit to prevent ignition of the gas device, and the controller unit stops outputting the control signal.

10. The method according to claim 7, characterized in that, The method further includes: If the first flame presence state of the gas device indicates that the gas device has a flame, an alarm will be issued.

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