CN112082179A - Gas flameout protection method, device, equipment and computer readable storage medium - Google Patents

Abstract

The application discloses gas flameout protection method, device and equipment and a computer readable storage medium, relates to the technical field of intelligent kitchens, and can ensure that gas can be flameout in time under the condition that the software program function is unstable, and improve the safety of a gas stove. The method comprises the following steps: monitoring an ignition control signal by using an ignition control service, and controlling the gas valve to be opened/closed according to state logic corresponding to the ignition control signal; if the ignition control service is monitored to be invalid, a timer is used for interrupting the service to control the air valve to be closed; and if the timer is monitored to be out of service, the air valve is controlled to be closed by using the watchdog service.

Description

Gas flameout protection method, device, equipment and computer readable storage medium

Technical Field

The application relates to the technical field of intelligent kitchens, in particular to a gas flameout protection method, a gas flameout protection device, gas flameout protection equipment and a computer readable storage medium.

Background

Generally, a gas range refers to kitchen appliances used in our daily life and industry, and uses gas (artificial gas, liquefied petroleum, natural gas) as fuel.

When a gas flameout instruction is started, a software program feeds back a specific state of the gas stove based on a flame state signal read by the gas flameout instruction, and further the gas valve can be driven according to the specific state of the gas stove to realize the opening or closing of the gas valve. However, in an actual gas flameout scene, the software program function is unstable, and once the software program function fails, it is difficult to ensure that the gas can be flamed out in time, which is easy to cause serious safety accidents.

Disclosure of Invention

In view of this, the present application provides a gas flameout protection method, device, apparatus and computer readable storage medium, and mainly aims to solve the problem that it is difficult to ensure that gas can be flameout in time due to unstable functions of the current software program.

According to a first aspect of the present application, there is provided a gas flame-out prevention method, comprising:

monitoring an ignition control signal by using an ignition control service, and controlling the gas valve to be opened/closed according to state logic corresponding to the ignition control signal;

if the ignition control service is monitored to be invalid, a timer is used for interrupting the service to control the air valve to be closed;

and if the timer is monitored to be out of service, the air valve is controlled to be closed by using the watchdog service.

Further, the method further comprises:

respectively acquiring a gas combustion state signal and a gas valve working state signal in the process of monitoring an ignition control signal by using an ignition control service;

monitoring a state logic formed by combining the gas combustion state signal and the gas valve working state signal by using a timer interrupt service;

and if the state logic formed by the combination is mapped to an abnormal state continuously after the preset time of the timer is exceeded, determining that the ignition control service is invalid.

Further, acquire gas combustion state signal and pneumatic valve operating condition signal respectively, specifically include:

detecting the temperature change near a burner on the gas stove by using a preset induction probe to obtain a gas combustion state signal;

and acquiring a working state signal of the air valve based on the air valve state output by the air valve driving circuit.

Further, the monitoring of the state logic formed by combining the gas combustion state signal and the gas valve working state signal by using the timer interrupt service specifically includes:

setting a timing frequency corresponding to the timer interrupt service;

and monitoring a state logic formed by combining the gas combustion state signal and the gas valve working state signal according to the timing frequency corresponding to the timer interrupt service.

Further, the abnormal state includes abnormal flame state and abnormal gas state, utilize the timer to interrupt service control gas valve and close, specifically include:

and outputting an emergency signal by utilizing the timer interrupt service, adjusting the state logic corresponding to the emergency signal and controlling the air valve to be closed.

Further, the method further comprises:

if the timer interrupt service is disabled, the timer interrupt service is caused to fail.

Further, the utilizing watchdog service to control the air valve to close specifically includes:

and outputting a state signal by using hardware driven by the watchdog service, and adjusting state logic corresponding to the state signal to control the air valve to be closed.

Further, after the status logic formed by combining the gas combustion status signal and the gas valve operating status signal monitored by the timer interrupt service, the method further comprises:

and if the state logic is mapped to be changed from an abnormal state to a fire-off state or an ignition state within the time preset by the timer, resetting the timer for the preset time.

Further, after the status logic formed by combining the gas combustion status signal and the gas valve operating status signal monitored by the timer interrupt service, the method further comprises:

and if the state logic is mapped to be a fire-off state or an ignition state, monitoring an ignition control signal by using an ignition control service, and controlling the gas valve to be opened/closed according to the state logic corresponding to the ignition control signal.

According to a second aspect of the present application, there is provided a gas flame out prevention device, comprising: the ignition control module, the timing module and the watchdog module;

the ignition control module is used for monitoring an ignition control signal by using an ignition control service and controlling the opening/closing of an air valve according to the state logic corresponding to the ignition control signal;

the timing module is used for interrupting the service to control the air valve to be closed by using a timer if the ignition control service is monitored to be invalid;

and the watchdog module is used for controlling the air valve to be closed by using watchdog service if the timer interrupt service is monitored to be invalid.

Further, the apparatus further comprises:

the acquisition module is used for respectively acquiring a gas combustion state signal and a gas valve working state signal in the process of monitoring the ignition control signal by using the ignition control service;

the monitoring module is used for monitoring a state logic formed by combining the gas combustion state signal and the gas valve working state signal by using a timer interrupt service;

and the first determination module is used for determining that the ignition control service is invalid if the state logic formed by the combination is mapped into an abnormal state continuously after the preset time of the timer is exceeded.

Further, the obtaining module comprises: the signal conditioning unit and the air valve driving unit;

the signal conditioning unit is used for detecting the temperature change near a burner on the gas stove by using a preset induction probe to obtain a gas combustion state signal;

and the air valve driving unit is used for acquiring an air valve working state signal based on the air valve state output by the air valve driving circuit.

Further, the monitoring module includes: a setting unit and a monitoring unit;

the setting unit is used for setting a timing frequency corresponding to the timer interrupt service;

and the monitoring unit is used for monitoring a state logic formed by combining the gas combustion state signal and the gas valve working state signal according to the timing frequency corresponding to the timer interrupt service.

Further, the abnormal state includes an abnormal flame state and an abnormal gas state,

the timing module is specifically used for outputting an emergency signal by using the timer interrupt service, adjusting state logic corresponding to the emergency signal and controlling the air valve to be closed.

Further, the apparatus further comprises:

a second determining module for causing the timer interrupt service to fail if the timer interrupt service is disabled.

Further, the watchdog module is specifically configured to output a state signal by using hardware driven by the watchdog service, and adjust a state logic corresponding to the state signal to control the air valve to close.

Further, the apparatus further comprises:

and the resetting module is used for resetting the timer for a preset time if the state logic is mapped to be changed from an abnormal state to a fire-off state or an ignition state within the preset time of the timer after the state logic formed by combining the gas combustion state signal and the gas valve working state signal is monitored by using the timer interrupt service.

Further, the apparatus further comprises:

and the control module is used for monitoring an ignition control signal by using an ignition control service and controlling the gas valve to be opened/closed according to the state logic corresponding to the ignition control signal after the state logic formed by combining the gas combustion state signal and the gas valve working state signal is monitored by using the timer interrupt service, and if the state logic is mapped to an off-fire state or an ignition state.

According to a third aspect of the present application, there is provided an apparatus comprising a memory storing a computer program and a processor implementing the steps of the method of the first aspect when the processor executes the computer program.

According to a fourth aspect of the present application, there is provided a readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the method of the first aspect described above.

By the technical scheme, compared with the mode of driving the gas valve according to the specific state of the gas stove in the prior art, the method, the device, the equipment and the computer-readable storage medium for preventing the gas flameout provided by the application have the advantages that after the gas equipment is started, the ignition control signal is monitored by the ignition control service, the gas valve is controlled to be opened/closed according to the state logic corresponding to the ignition control signal, if the ignition terminal service is monitored to be out of service, the gas valve is controlled to be closed by the timer interrupt service, so that the situation that the gas equipment can still normally process flameout and gas leakage after the ignition notification service is abnormally failed is increased, if the time effect of the timer interrupt service is monitored, the gas valve is controlled to be closed by the watchdog service, even if the timer interrupt service is abnormally closed, the gas valve can still be safely closed, and the gas equipment is subjected to double protection by designing the timer interrupt service and the watchdog service, the safety of the gas equipment is improved.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic flow chart illustrating a gas flameout prevention method provided by an embodiment of the present application;

FIG. 2 is a schematic flow chart illustrating another gas flameout prevention method provided by the embodiment of the present application;

FIG. 3 is a block flow diagram illustrating another method for preventing gas flameout according to an embodiment of the present disclosure;

FIG. 4A is a schematic structural diagram of a gas flame-out prevention device provided by an embodiment of the present application;

FIG. 4B is a schematic view of another gas flame-out prevention device provided by the embodiment of the present application;

FIG. 4C is a schematic view of another gas flame-out prevention device provided by the embodiment of the present application;

FIG. 4D is a schematic diagram illustrating another gas flame-out prevention device provided by an embodiment of the present application;

FIG. 4E is a schematic view of another gas flame-out prevention device provided by the embodiment of the present application;

FIG. 4F is a schematic view of another gas flame-out prevention device provided by the embodiment of the present application;

FIG. 4G illustrates a schematic structural view of another gas flame-out prevention device provided by the embodiment of the application;

fig. 5 is a schematic structural diagram of another gas flameout prevention device provided by the embodiment of the application.

Detailed Description

Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

Before explaining the present application in detail, a brief explanation of the gas extinction prevention process involved in the present application will be given. The gas flame-out protection process relates to intelligent gas equipment, and in the working process of the intelligent gas equipment, flame detection and the opening or closing of a gas valve need to be controlled by software, and once the software fails, serious safety accidents can be caused by arranging a flame-out protection system in the intelligent gas equipment. Use the service of timed interruption and watchdog service to carry out software and hardware combination in this application, form after ignition control service became invalid, the pneumatic valve can be controlled to the service of timed interruption, realizes flame-out function protection, and further after the service of timed interruption became invalid, the pneumatic valve can be controlled to the service of watchdog and closes, realizes the dual protection to flame-out gas.

The embodiment of the application provides a gas flameout protection method, which can be applied to a gas equipment side, and as shown in fig. 1, the method comprises the following steps:

101. and monitoring the ignition control signal by using an ignition control service, and controlling the gas valve to be opened/closed according to the state logic corresponding to the ignition control signal.

The ignition control can control the size of primary current of the ignition coil and the power-off time through the power-off switch, so that the ignition energy and the ignition time are controlled, the ignition and flameout of gas are realized, the ignition control signal is output, the state logic of the ignition control signal is 1 when the gas is ignited, the state logic of the ignition control signal is 0 when the gas is flamed out, the ignition control service can monitor the ignition control signal, and the gas valve is controlled to be opened/closed according to the state logic corresponding to the ignition control signal.

Generally, during the operation of the gas equipment, the operation of gas ignition, gas valve opening, gas flameout, gas valve closing and the like can be performed, when the operation of gas ignition or gas flameout and the like is generated, the state logic corresponding to the output ignition control signal can be adjusted, and the gas valve opening/closing is controlled according to the state logic corresponding to the ignition control signal.

102. And if the ignition control service is monitored to be invalid, interrupting the service by using a timer to control the gas valve to be closed.

It can be understood that, because the internal software logic of the gas appliance is complex, the operating environment changes dynamically, and different software modules may be very different, it is easy to cause the failure of the ignition control service in the software. At the moment of gas ignition or gas shutoff, an uncontrollable specific state often exists, for example, a phenomenon that a gas valve is opened without flame when the gas is ignited, a phenomenon that the gas valve is closed with flame when the gas is shut off, and if the specific state is continued for a long time under the condition that the ignition control service is invalid, potential safety hazards can be caused.

In order to improve the safety of gas flameout, a timer interrupt service can be added when the ignition control service is monitored to be invalid, the timer interrupt service is utilized to read a gas combustion state signal output by a flameout protection signal and a gas valve working state signal output by a gas valve driving circuit, wherein the state logic of the gas combustion state signal can reflect the flame state of gas equipment, the state logic of the gas valve working state signal can reflect the gas valve state of the gas equipment, and the specific state of the current gas equipment is fed back by judging the state logic formed by combining the two signals, so that whether the ignition control service is invalid or not is judged.

For example, the state logic of the gas combustion signal is 1, which indicates that the gas equipment is in a flame state, the state logic of the gas combustion signal is 0, which indicates that the gas equipment is in a non-flame state, the state logic of the gas valve working state signal is 1, which indicates that the gas valve of the gas equipment is opened, the state logic of the gas valve working state signal is 0, which indicates that the gas valve of the gas equipment is closed, correspondingly, the state logic formed by the two signals is 0/0, which indicates that the gas valve is closed and may be in a normal fire-off state, the state logic formed by the two signals is 0/1, which indicates that the gas valve is open and is in an ignition instant state, and may also be in a flameout protection state, and an ignition abnormal state is generated, the state logic formed by the two signals is 1/0, which indicates that the gas valve is closed and may be in a fire-off instant state, and may also be, the abnormal state of fire-off is generated, the state logic formed by the two signals is 1/1, which shows that there is flame, the air valve is open, and the state is normal state of fire-on. For the conditions of normal firing state and normal fire stopping state, the ignition control service is normal, the gas valve is controlled to be opened/closed by the state logic corresponding to the ignition control signal, and the ignition abnormal state or abnormal fire stopping state indicates that the ignition control service cannot control the gas valve and the timer is required to interrupt the service to control the gas valve to be closed.

103. And if the timer is monitored to be out of service, the air valve is controlled to be closed by using the watchdog service.

In the process of controlling the air valve by using the timer to interrupt service, the timer starts internal counting, if the timer enters overtime next time, when the state logic formed by two signals continues to maintain, the counting is added by 1, if the counting exceeds a preset value, the situation that an abnormal firing state or abnormal shut-off state occurs can be judged, at the moment, the ignition control service fails, the air valve is controlled to be closed by the timer interrupt service, and once the timer is interrupted or closed due to other reasons or the system global interrupt is closed, the timer cannot enter, the air valve cannot be controlled to be closed, the air valve needs to be controlled to be closed by using watchdog service, so that the air valve can be safely closed after the ignition control service fails and the timer interrupt service fails.

Compared with the mode of driving the gas valve according to the specific state of the gas stove in the prior art, the gas flameout protection method provided by the application monitors the ignition control signal by using the ignition control clothes after the gas equipment is started, controlling the gas valve to open/close according to the state logic corresponding to the ignition control signal, if the service of the ignition terminal is monitored to be invalid, the timer is used for interrupting the service to control the gas valve to be closed so as to increase that the gas equipment can still normally process the conditions of flameout and gas leakage after the ignition notification service is abnormally disabled, if the service timeliness of the timed interrupt is monitored, the watchdog service is used for controlling the air valve to be closed, even if the timer interrupt service is abnormally closed, the gas valve can still be safely closed, and the gas equipment is protected by designing the timer interrupt service and the watchdog service, so that the safety of the gas equipment is improved.

Further, as a refinement and an extension of the specific implementation of the above embodiment, an embodiment of the present invention provides another gas flameout prevention method, as shown in fig. 2, the method includes:

201. and monitoring the ignition control signal by using an ignition control service, and controlling the gas valve to be opened/closed according to the state logic corresponding to the ignition control signal.

The existing gas equipment refers to common kitchen appliances which are heated by direct fire with gas fuels such as liquefied petroleum gas, processed gas, natural gas and the like, and in consideration of the intelligent requirements of safety, energy conservation, operation and the like of the kitchen appliances, a controller MCU for controlling parameters in the gas combustion process is added into the intelligent gas equipment, and a software program is embedded into the controller, so that the gas equipment is monitored in all links, such as flame detection, gas valve switch and the like, and the software program is required to participate in control, and the intelligent gas equipment is realized.

The controller MCU in the intelligence gas equipment can be become by a plurality of control module group, includes: the device comprises a flameout protection needle, a signal conditioning circuit, an ignition control service, a NAND gate logic circuit and an air valve driving circuit. In an actual application scenario, a flameout protection needle can be used for sensing a gas combustion signal, since the gas combustion signal is represented by an analog signal, a signal conditioning circuit is required to modulate the gas combustion signal to obtain a gas combustion signal represented by a digital signal, the modulated gas combustion signal is further input to an ignition control service to obtain an ignition control signal, a logic state corresponding to the ignition control signal is processed by a nand gate logic circuit to form a gas valve working state signal, and a gas valve driving circuit controls the gas valve to be opened/closed.

202. And respectively acquiring a gas combustion state signal and an air valve working state signal in the process of monitoring the ignition control signal by using the ignition control service.

The gas combustion state signal is a combustion state on the gas equipment and comprises two states of flame and no flame, a temperature value near a combustor of the gas equipment can be detected by the temperature detection device for the combustion state, and then the state logic corresponding to the gas combustion state signal is determined according to the temperature value, the gas valve working state signal is a gas valve switching state and comprises two states of gas valve opening and gas valve closing, and the state logic corresponding to the gas valve working state signal can be determined by the gas valve state output by the gas valve driving circuit for the gas valve opening/closing.

Specifically, for a gas combustion signal, a preset induction probe can be used for detecting the temperature change near a burner on a gas stove to obtain a gas combustion state signal, when flame burns to the induction probe, the induction probe can detect the temperature change near the burner, if the temperature change reaches a preset temperature value within a limited time, the existence of flame is judged, and if the temperature change does not reach the preset temperature value, the absence of flame is judged; and for the air valve working state signal, the air valve working state signal can be obtained based on the air valve state output by the air valve driving circuit, if the signal air valve state mark output by the air valve driving circuit is open, the air valve is judged to be opened, and if not, the air valve is judged to be closed.

203. And monitoring a state logic formed by combining the gas combustion state signal and the gas valve working state signal by using a timer interrupt service.

In order to ensure that the timer interrupt service can timely monitor the failure condition of the ignition control service, the timing frequency corresponding to the timer interrupt service can be set to be far greater than the period of the response detected by the inductive probe, so that the timer interrupt service can be responded preferentially, and further, the state logic formed by combining the gas combustion state signal and the gas valve working state signal is monitored according to the timing frequency corresponding to the timer interrupt service.

In the embodiment of the application, the priority corresponding to the timer interrupt service in the controller MCU is set to be the highest level which can be configured by software, so that the software of the timer interrupt service part can be ensured to run according to the time under the condition that the timer interrupt service is not closed or the global interrupt of the controller MCU is not closed.

204. And if the state logic formed by the combination is mapped to an abnormal state continuously after the preset time of the timer is exceeded, determining that the ignition control service is invalid.

It is understood that after the assertion comes in, the timer interrupt service obtains the specific state of the gas appliance by reading the state logic formed by combining the gas combustion state signal and the gas valve operating state signal.

The state logic formed by the combination may include an ignition state, a shut-off state, and an abnormal state including an abnormal flame state and an abnormal gas state, the abnormal gas state being a momentary special state that may be an ignition state, the abnormal flame state being a momentary special state that may be a shut-off state, and indicating a failure of the ignition control service if the abnormal state persists for a long time.

Specifically, in an actual application scenario, in the process of monitoring an ignition control signal by using an ignition control service, a timer interrupt service monitors a state logic formed by combination according to a timing frequency, and further monitors the duration of an abnormal state when the state logic formed by combination is mapped to the abnormal state, if the state logic formed by combination is mapped to be changed from the abnormal state to an ignition-off state or an ignition state within a preset time of the timer, it indicates that the ignition control service is not invalid, it can be considered that a short-time abnormality is eliminated, such as an ignition moment or a flameout moment, and then an abnormal signal is ignored, the on/off of an air valve is still determined by the ignition control service inside a controller MCU, and then the preset time of the timer is reset. Typically, the timer is scheduled for a time that does not last too long, preferably 3-5 s. If the combined state logic is mapped to be a fire-off state or an ignition state, the ignition control service is also indicated to be not invalid, the ignition control service is utilized to monitor the ignition control signal, and the gas valve is controlled to be opened/closed according to the state logic corresponding to the ignition control signal. If the state logic formed by the combination is mapped to be an abnormal state continuously after the preset time of the timer is exceeded, the ignition control service is invalid, and the ignition control service monitors the state logic corresponding to the ignition control signal and cannot control the opening/closing of the air valve.

205. And outputting an emergency signal by utilizing the timer interrupt service, adjusting the state logic corresponding to the emergency signal and controlling the air valve to be closed.

It can be understood that if the duration of the abnormal state is too long, it indicates that the ignition control service loses control over the air valve, at this time, an emergency signal needs to be generated, and the emergency signal passes through the nand gate logic circuit to form an air valve working state signal, and then an air valve driving circuit is needed to intervene to forcibly close the air valve, and an alarm mechanism is started at the same time. If the abnormal duration time is less than the set time, the abnormal state is eliminated, an emergency signal is not required to be generated, and the ignition control signal is used for controlling the opening/closing of the air valve continuously.

206. If the timer interrupt service is disabled, the timer interrupt service is caused to fail.

It will be appreciated that since the ignition control service uses a higher level interrupt or the interrupt is turned off, it is easy to generate a timer service interrupt that is disabled so that the timer interrupt cannot be entered, resulting in a failure of the timer interrupt service.

207. And outputting a state signal by using hardware driven by the watchdog service, and adjusting state logic corresponding to the state signal to control the air valve to be closed.

Specifically, in an actual application scenario, as shown in fig. 3, the controller MCU includes an ignition control service and a timer interrupt service, on one hand, the ignition control service in the controller MCU controls and drives the K1 air valve through an ignition control signal S4, so as to open/close the air valve; on the other hand, the timer interrupt service inside the controller MCU obtains the combustion state of the gas appliance by reading the gas combustion signal S5 and the heuristic operating state signal S2. In consideration of the safety in the gas combustion process, the timer interrupt service and the watchdog service are added, so that the dangerous accident that the gas equipment can still normally process flameout and gas leakage after the ignition control service fails due to abnormality is increased.

It is understood that the valve status signal for controlling the opening/closing of the valve in fig. 3 is mainly determined by three input signals passing through the nand gate logic circuit, and respectively outputs an ignition control signal S4, a timer interrupt service output emergency status signal S6, and a watchdog service driving hardware output status signal S1. Under the condition that the software normally works, the gas valve can be controlled to be opened/closed according to the state logic corresponding to the ignition control signal S4, for the condition that the ignition control service is not failed, the state logic corresponding to the timer interrupt service output emergency state signal S6 is 1, the state logic corresponding to the state signal S1 output by the watchdog service driving hardware is 1, for the condition that the ignition control service is failed, that is, the state logic corresponding to the timer interrupt service output emergency state signal S6 is 0 or the state logic corresponding to the state signal S1 output by the watchdog service driving hardware is 0, the state logic corresponding to the ignition control signal S4 is failed, that is, the gas valve cannot be controlled to be opened or closed no matter the state logic corresponding to the ignition control signal S4 is 1 or 0.

The state logic between specific signals is shown in table 1 below, where K1 is a valve state, the state logic corresponding to S4 is 1 or 0, and the valve K1 can be controlled to be opened or closed, when the state logic corresponding to S1 is 0, S4 and S6 are disabled, the valve K1 is controlled to be closed through the state logic corresponding to S1, when the state logic corresponding to S6 is 0, S1 and S4 are disabled, and the valve K1 is controlled to be closed through the state logic corresponding to S6.

TABLE 1

S4	S1	S6	K1
				X	0	X	Close off
0	1	1	Close off
				1	1	1	Is opened
X	X	0	Close off

It is understood that the determination of whether S4 and S6 are disabled can be determined by the status logic formed by the gas combustion signal S5 and the valve operating status signal S2, and the logic values of the specific status signals are shown in table 2 below, where S2 being 0 indicates that the valve is closed, S2 being 0 indicates that the valve is open, S5 being 0 indicates no flame, and S5 being 1 indicates flame.

TABLE 2

The state logic formed by the two signals can be shown in the following table 3, and different state logics formed by combining the gas combustion signal and the gas valve working state signal in the table 3 can reflect different states of the gas equipment and can enter different conditions.

TABLE 3

The first state logic formed as a combination shown in table 3: s2 is 0, S5 is 0, which indicates that the working state of the gas valve is gas valve closing, the gas combustion state is flameless, has no any ignition state and can be identified as normal state of fire closing, and the gas valve opening/closing is controlled by an ignition control signal S4 at the moment.

Second state logic formed as a combination shown in Table 3: s2 is 0, S5 is 1, it shows that the working state of the gas valve is gas valve closing, the gas combustion state is flame, this situation may appear in the moment of fire closing, so it should be counted in the timer, if it is found that this state logic still exists after a period of time, it can be judged that the gas outlet valve has fault, it can't be really closed, the state logic corresponding to the emergency signal S6 is 0 by using the timer interrupt program, meanwhile, the watchdog service is not started, because this state is very likely that the gas valve has not been controlled, the software can also trigger other alarm mechanism, if it is found that this logic is continuously eliminated in short time, the state can be ignored, it is used as the normal phenomenon of gas combustion in the gas outlet side pipeline at the moment of fire closing.

The third state logic formed as a combination shown in Table 3: s2 is 1, S5 is 0, the working state of the gas valve is that the gas valve is opened, the combustion state of the gas is flameless, the gas equipment can be judged to be in one of two states of ignition moment or flameout and gas valve opening, at the moment, the timer still starts an internal counting, if the timer enters overtime next time, the logic of the state is maintained, the counting is increased by 1, if the counting exceeds a preset value, the ignition is judged to be turned off, the ignition control service loses the control of the gas valve, at the moment, the state logic corresponding to the emergency signal S6 is 0 output by using the timer interrupt program, the gas valve K1 is forcibly closed, an alarm mechanism is started, if the logic is continuously eliminated for a short time, the state can be ignored and taken as the ignition moment.

The fourth state logic formed as a combination shown in Table 3: and S2 is 1, S5 is 1, the working state of the gas valve is that the gas valve is opened, the gas is in a combustion state with flame and in an ignition state, the gas valve can be identified as a normal state of ignition, the timer interrupts the control service to continuously monitor the ignition control service, the watchdog service normally outputs a state signal S1, the corresponding state logic is 1, and the opening/closing of the gas valve is controlled by the ignition control signal S4.

It should be noted that as a special case of the above four logic states, if the timer interrupt is turned off or the global interrupt of the controller MCU is turned off due to other reasons, the timer interrupt cannot enter, and the hardware service driven by the watchdog cannot be normally executed, it is necessary to adjust the state logic corresponding to the output state signal S1 to be 0, so that even in the case that the timer interrupt is abnormally turned off and the software of the controller MCU fails, the gas valve can still be safely closed.

Further, as a specific implementation of the method shown in fig. 1 or fig. 2, an embodiment of the present invention provides a gas flameout prevention device, as shown in fig. 4A, the device includes: an ignition control module 31, a timing module 32, a watchdog module 33.

The ignition control module 31 may be configured to monitor an ignition control signal by using an ignition control service, and control the gas valve to open/close according to a state logic corresponding to the ignition control signal;

the timing module 32 may be configured to interrupt the service control air valve to close by using a timer if it is monitored that the ignition control service is disabled;

the watchdog module 33 may be configured to control the gas valve to be closed by using a watchdog service if it is monitored that the timer interrupt service fails.

Compared with the mode of driving the gas valve according to the specific state of the gas stove in the prior art, the gas flameout protection device provided by the application monitors the ignition control signal by using the ignition control clothes after the gas equipment is started, controlling the gas valve to open/close according to the state logic corresponding to the ignition control signal, if the service of the ignition terminal is monitored to be invalid, the timer is used for interrupting the service to control the gas valve to be closed so as to increase that the gas equipment can still normally process the conditions of flameout and gas leakage after the ignition notification service is abnormally disabled, if the service timeliness of the timed interrupt is monitored, the watchdog service is used for controlling the air valve to be closed, even if the timer interrupt service is abnormally closed, the gas valve can still be safely closed, and the gas equipment is protected by designing the timer interrupt service and the watchdog service, so that the safety of the gas equipment is improved.

In a specific application scenario, as shown in fig. 4B, the apparatus further includes:

the acquiring module 34 may be configured to acquire a gas combustion state signal and a gas valve operating state signal during monitoring of the ignition control signal by using the ignition control service;

the monitoring module 35 may be configured to monitor a state logic formed by combining the gas combustion state signal and the gas valve operating state signal by using a timer interrupt service;

the first determination module 36 may be configured to determine that the ignition control service is disabled if the state logic formed by the combination continues to map to an abnormal state after a predetermined time period of the timer.

In a specific application scenario, as shown in fig. 4C, the obtaining module 34 includes: a signal conditioning unit 341 and an air valve driving unit 342;

the signal conditioning unit 341 is configured to detect a temperature change near a burner on the gas stove by using a preset sensing probe, and obtain a gas combustion state signal;

the air valve driving unit 342 may be configured to obtain an air valve working state signal based on an air valve state output by the air valve driving circuit.

In a specific application scenario, as shown in fig. 4D, the monitoring module 35 includes: a setting unit 351, a monitoring unit 352;

a setting unit 351, configured to set a timing frequency corresponding to the timer interrupt service;

the monitoring unit 352 may be configured to monitor a state logic formed by combining the gas combustion state signal and the gas valve operating state signal according to a timing frequency corresponding to the timer interrupt service.

In a specific application scenario, the abnormal conditions include an abnormal flame condition and an abnormal gas condition,

the timing module 32 may be specifically configured to output an emergency signal by using the timer interrupt service, and adjust a state logic corresponding to the emergency signal to control the air valve to close.

In a specific application scenario, as shown in fig. 4E, the apparatus further includes:

a second determining module 37, configured to cause the timer interrupt service to fail if the timer interrupt service is disabled.

In a specific application scenario, the watchdog module 33 may be specifically configured to output a state signal by using hardware driven by the watchdog service, and adjust a state logic corresponding to the state signal to control the air valve to close.

In a specific application scenario, as shown in fig. 4F, the apparatus further includes:

the reset module 38 may be configured to reset the timer for a predetermined time after the status logic formed by combining the gas combustion status signal and the gas valve operating status signal monitored by the timer interrupt service is configured, if the status logic is mapped to be changed from an abnormal state to a fire-off state or an ignition state within a predetermined time of the timer.

In a specific application scenario, as shown in fig. 4G, the apparatus further includes:

the control module 39 may be configured to monitor the ignition control signal by using the ignition control service after the state logic formed by combining the gas combustion state signal and the gas valve operating state signal is monitored by using the timer interrupt service, and control the gas valve to be turned on/off according to the state logic corresponding to the ignition control signal if the state logic is mapped to the off-state or the ignition state.

In an exemplary embodiment, referring to fig. 5, there is further provided a device, where the device 400 includes a communication bus, a processor, a memory, and a communication interface, and may further include an input/output interface and a display device, where the functional units may communicate with each other through the bus. The memory stores computer programs, and the processor is used for executing the programs stored in the memory and executing the gas flameout protection method in the embodiment.

A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the gas flame out prevention method.

Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented by hardware, and also by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the implementation scenarios of the present application.

Those skilled in the art will appreciate that the figures are merely schematic representations of one preferred implementation scenario and that the blocks or flow diagrams in the figures are not necessarily required to practice the present application.

Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.

The above application serial numbers are for description purposes only and do not represent the superiority or inferiority of the implementation scenarios.

The above disclosure is only a few specific implementation scenarios of the present application, but the present application is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present application.

Claims (12)

1. A gas flameout protection method is characterized by comprising the following steps:

monitoring an ignition control signal by using an ignition control service, and controlling the gas valve to be opened/closed according to state logic corresponding to the ignition control signal;

if the ignition control service is monitored to be invalid, a timer is used for interrupting the service to control the air valve to be closed;

and if the timer is monitored to be out of service, the air valve is controlled to be closed by using the watchdog service.

2. The method of claim 1, further comprising:

respectively acquiring a gas combustion state signal and a gas valve working state signal in the process of monitoring an ignition control signal by using an ignition control service;

monitoring a state logic formed by combining the gas combustion state signal and the gas valve working state signal by using a timer interrupt service;

and if the state logic formed by the combination is mapped to an abnormal state continuously after the preset time of the timer is exceeded, determining that the ignition control service is invalid.

3. The method according to claim 2, wherein the separately acquiring the gas combustion state signal and the gas valve operating state signal specifically comprises:

detecting the temperature change near a burner on the gas stove by using a preset induction probe to obtain a gas combustion state signal;

and acquiring a working state signal of the air valve based on the air valve state output by the air valve driving circuit.

4. The method according to claim 2, wherein the monitoring of the state logic formed by the combination of the gas combustion state signal and the gas valve operating state signal using the timer interrupt service specifically comprises:

setting a timing frequency corresponding to the timer interrupt service;

and monitoring a state logic formed by combining the gas combustion state signal and the gas valve working state signal according to the timing frequency corresponding to the timer interrupt service.

5. The method according to any one of claims 2 to 4, wherein the abnormal conditions include an abnormal flame condition and an abnormal gas condition, and the using the timer interrupt service to control the gas valve to close comprises:

and outputting an emergency signal by utilizing the timer interrupt service, adjusting the state logic corresponding to the emergency signal and controlling the air valve to be closed.

6. The method of claim 1, further comprising:

if the timer interrupt service is disabled, the timer interrupt service is caused to fail.

7. The method as claimed in claim 6, wherein the controlling of the closing of the gas valve by the watchdog service comprises:

and outputting a state signal by using hardware driven by the watchdog service, and adjusting state logic corresponding to the state signal to control the air valve to be closed.

8. The method of claim 2, wherein after the status logic formed by the combination of monitoring the gas combustion status signal with a gas valve operating status signal using a timer interrupt service, the method further comprises:

and if the state logic is mapped to be changed from an abnormal state to a fire-off state or an ignition state within the time preset by the timer, resetting the timer for the preset time.

9. The method of claim 8, wherein after the status logic formed by the combination of monitoring the gas combustion status signal with a gas valve operating status signal using a timer interrupt service, the method further comprises:

and if the state logic is mapped to be a fire-off state or an ignition state, monitoring an ignition control signal by using an ignition control service, and controlling the gas valve to be opened/closed according to the state logic corresponding to the ignition control signal.

10. A gas flame-out protection device, characterized by comprising: the ignition control module, the timing module and the watchdog module;

the ignition control module is used for monitoring an ignition control signal by using an ignition control service and controlling the opening/closing of an air valve according to the state logic corresponding to the ignition control signal;

the timing module is used for interrupting the service to control the air valve to be closed by using a timer if the ignition control service is monitored to be invalid;

and the watchdog module is used for controlling the air valve to be closed by using watchdog service if the timer interrupt service is monitored to be invalid.

11. The apparatus of claim 10, further comprising:

the acquisition module is used for respectively acquiring a gas combustion state signal and a gas valve working state signal in the process of monitoring the ignition control signal by using the ignition control service;

the monitoring module is used for monitoring a state logic formed by combining the gas combustion state signal and the gas valve working state signal by using a timer interrupt service;

and the determining module is used for determining that the ignition control service is invalid if the state logic formed by the combination is mapped into an abnormal state continuously after the preset time of the timer is exceeded.

12. The apparatus of claim 10, wherein the obtaining module comprises: the signal conditioning unit and the air valve driving unit;

the signal conditioning unit is used for detecting the temperature change near a burner on the gas stove by using a preset induction probe to obtain a gas combustion state signal;

and the air valve driving unit is used for acquiring an air valve working state signal based on the air valve state output by the air valve driving circuit.

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