CN112682947A - Gas water heating equipment and disturbance compensation control method and readable storage medium thereof - Google Patents
Gas water heating equipment and disturbance compensation control method and readable storage medium thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 195
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- 238000004590 computer program Methods 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 7
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
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- 238000011144 upstream manufacturing Methods 0.000 description 1
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Abstract
The invention provides a gas water heating device, a disturbance compensation control method thereof and a readable storage medium. The disturbance compensation control method comprises the steps of obtaining set temperature, water flow and water outlet temperature; when the water flow fluctuates and the fluctuation amplitude is larger than or equal to the flow threshold value, or the set temperature changes and the change amplitude is larger than or equal to the second temperature threshold value, determining the disturbance direction; determining a third heat load according to the current set temperature, the current water flow, the current water outlet temperature and the disturbance direction; and controlling the air valve and/or the fan to operate according to the third heat load. Through the mode, the gas water heating equipment can identify disturbance factors and determine the disturbance direction, so that disturbance compensation control is timely carried out when disturbance occurs, and the affected water temperature can be quickly stabilized due to the disturbance.
Description
Technical Field
The present disclosure relates to the field of gas water heater control, and in particular, to a gas water heater, a disturbance compensation control method thereof, and a readable storage medium.
Background
Gas-fired water heating apparatuses generally include a gas water heater and a gas boiler. Wherein, the gas water heater is used for the supply demand of domestic hot water for drinking, bathing and the like; the gas boiler can be used for providing domestic hot water and can also be communicated with a radiator arranged indoors to provide a central heating function. The existing gas water heating equipment usually adopts constant temperature control, namely, the equipment can ensure constant temperature water outlet according to the water outlet temperature which is default or set by a user. However, the water usage in the user's home during actual use is complicated. For example, when the water flow in the waterway is changed or the water pressure fluctuates, the water temperature is stable for a long time and the overshoot is large.
Disclosure of Invention
To overcome the problems of the related art, the present disclosure provides a gas-fired water heating apparatus, a disturbance compensation control method thereof, and a readable storage medium.
A first aspect of the embodiments of the present disclosure provides a disturbance compensation control method for a gas-fired water heating apparatus. The gas water heating equipment comprises a combustor, a heat exchanger, a gas valve, a fan, a water outlet temperature detection element, a flow detection device and a controller. The disturbance compensation control method comprises the steps of obtaining set temperature, water flow and outlet water temperature; when the water flow fluctuates and the fluctuation amplitude is larger than or equal to the flow threshold value, or the set temperature changes and the change amplitude is larger than or equal to the second temperature threshold value, determining the disturbance direction; determining a third heat load according to the current set temperature, the current water flow, the current water outlet temperature and the disturbance direction; and controlling the air valve and/or the fan to operate according to the third heat load.
In some embodiments, the fluctuation amplitude of the water flow rate is determined from a difference between the flow value obtained for the current sampling period and an average of the flow values obtained for the previous sampling periods.
In some embodiments, the magnitude of the change in the set temperature is determined based on the difference between the current set temperature and the previous set temperature.
In some embodiments, determining the third thermal load based on the current set temperature, the current water flow, the current leaving water temperature, and the disturbance direction comprises: determining a PID control parameter according to the current water flow and the difference value between the set temperature and the current water outlet temperature; and inputting the PID control parameter into a PID control unit to calculate the value of the third heat load, and determining the third heat load according to the disturbance direction.
In some embodiments, the disturbance compensation control is exited when the difference between the current set temperature and the current leaving water temperature is less than or equal to the third temperature threshold.
A second aspect of the embodiments of the present disclosure provides a gas water heating apparatus including a burner for burning a mixture of gas and air, a heat exchanger for absorbing heat generated by the burner and transferring the heat to water flowing therethrough, a gas valve for controlling supply of the gas, a fan for driving air to flow, an outlet water temperature detecting element for detecting a temperature of the water, a flow rate detecting device for detecting a flow rate of the water, a controller connected or communicating with the gas valve, the fan, the outlet water temperature detecting element, the flow rate detecting device, and a storage unit. The controller comprises a disturbance judging unit and a disturbance direction determining unit. The controller is configured to acquire a set temperature, detect a flow rate of water by a flow rate detection means, and detect a temperature of water by an outlet water temperature detection element; the disturbance judging unit judges whether disturbance exists according to the water flow or the set temperature, and when the water flow fluctuates and the fluctuation amplitude is larger than or equal to the flow threshold value, or the set temperature changes and the change amplitude is larger than or equal to the second temperature threshold value, the disturbance direction determining unit determines the disturbance direction; determining a third heat load according to the current set temperature, the current water flow, the current water outlet temperature and the disturbance direction; and controlling the air valve and/or the fan to operate according to the third heat load. .
In some embodiments, the fluctuation amplitude of the water flow rate is determined from a difference between the flow value detected for the current sampling period and an average of the flow values detected for the previous sampling periods.
In some embodiments, the magnitude of the change in the set temperature is determined based on the difference between the current set temperature and the previous set temperature.
In some embodiments, the controller further comprises a PID parameter determination unit, and a PID control unit; the controller being configured to determine that the third thermal load based on the current set point temperature, the current water flow, the current leaving water temperature, and the disturbance direction comprises: the PID parameter determining unit determines a PID control parameter according to the current water flow and the difference value between the set temperature and the current outlet water temperature; and the PID control unit calculates the value of the third heat load according to the input PID control parameter and determines the third heat load according to the disturbance direction.
A third aspect of the embodiments of the present disclosure provides a computer-readable storage medium having stored thereon instructions which, when executed by a processor, implement the method described above.
Technical solutions provided by one or more embodiments of the present disclosure may include the following advantageous effects: the gas water heating equipment can identify disturbance factors and determine the disturbance direction, so that disturbance compensation control is timely carried out when disturbance occurs, and the water temperature influenced by the disturbance can be quickly stabilized.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a functional block diagram of a gas fired water heating apparatus in an embodiment of the present disclosure;
FIG. 2 is a functional block diagram of a controller of the gas-fired water heating apparatus shown in FIG. 1;
FIG. 3 is a flowchart of a method of the controller shown in FIG. 2 performing a start-up control of the gas-fired water heating apparatus;
FIG. 4 is a schematic block diagram of another embodiment of a controller for a gas-fired water heating apparatus shown in FIG. 1;
fig. 5 is a flowchart of a disturbance compensation control method of the gas fired water heating apparatus performed by the controller shown in fig. 4.
Detailed Description
The embodiments shown will be described in detail below with reference to the accompanying drawings. These embodiments are not intended to represent all embodiments consistent with the present disclosure, and structural, methodological or functional changes in accordance with these embodiments are intended to be encompassed by the present claims.
The gas water heater uses combustible gas as fuel, such as natural gas, city gas, liquefied gas, methane, etc., and supplies heat to satisfy the living needs of users by burning the combustible gas, for example, a gas water heater for supplying living hot water, or a gas boiler for simultaneously supplying the living hot water and the heating needs, etc.
As shown in fig. 1, the gas-fired water heating apparatus 100 includes a housing 10, and a burner assembly, a heat exchanger 13, a smoke exhaust device 14, and the like, which are housed in the housing 10. The housing 10 may be formed by splicing several panels to form a receiving space therein to accommodate the components. The bottom of the housing 10 extends with a water inlet pipe 111, a water outlet pipe 112, and a gas supply pipe 113.
The burner assembly generally includes a gas distribution frame (not shown) and a burner 12. An air valve 15 is disposed on the gas supply line 113, and the air valve 15 may be an electrically controllable valve for connecting or disconnecting the gas supply passage and controlling the supply of gas into the gas-distributing frame. In some embodiments, the combustor 12 includes several combustion units arranged side-by-side in the longitudinal direction. Each combustion unit is in the form of a flat plate, which is generally vertically fixed in the burner frame, and has an air inlet at a lower portion thereof, a plurality of fire holes at a top portion thereof, and a gas-air mixing passage communicating the air inlet and the plurality of fire holes. The gas through the gas valve 15 is distributed into the gas inlet of each combustion unit through the gas distribution frame and mixed with the simultaneously introduced primary air in the gas-air mixing passage and transferred to the fire holes at the top of the fire row sheets for combustion and generation of hot flue gas. The burner assembly further comprises an ignition device 121 for igniting the gas and air mixture, and a flame detection device 122 for detecting the presence of a flame. In some embodiments, the ignition device 121 includes a pair of ignition electrodes extending over the fire holes of the combustion unit. The flame detection device 122 includes a flame detection electrode extending over the fire hole of the combustion unit.
The heat generated by the combustion of the burner 12 passes through a heat exchanger 13. The heat exchanger 13 is typically disposed above the combustor 12. In some embodiments, the heat exchanger may be a finned tube heat exchanger, i.e., a plurality of fins are disposed in the heat exchanger shell, and a heat exchange water pipe passes through the fins in a winding manner, and both ends of the heat exchange water pipe are respectively communicated with the water inlet pipe 111 located upstream in the water flow direction and the water outlet pipe 112 located downstream in the water flow direction. The heat generated by the combustion of the gas-air mixture is absorbed by the fins and further transferred to the water flowing through the heat exchange water pipe, and the heated water is transferred to the water pipe of the domestic water through the water outlet pipe 112, so that the domestic water for drinking, bathing and the like is provided for the user.
In this embodiment, a fan 16 is disposed below the burner 12 to drive air flow to provide air for combustion and to cause flue gases generated by combustion to be collected by a smoke collection hood of the smoke exhaust 14 and exhausted through a smoke exhaust duct (not shown) connected to the smoke collection hood. An inlet temperature detecting element 181 is disposed at the inlet pipe 111 (e.g., on the outer wall of the inlet pipe), and an outlet temperature detecting element 182 is disposed at the outlet pipe 112 (e.g., on the outer wall of the outlet pipe). The Temperature sensing element may be a thermistor, such as a Positive Temperature Coefficient thermistor (PTC), or in some embodiments, a Negative Temperature Coefficient (NTC) Temperature sensor. A flow rate detection device 183 is provided in the water path for detecting the flow rate of water. In some embodiments, the flow sensing means may be installed at the inlet pipe 111 for sensing the inlet water flow, and may include a rotor assembly with a magnet and a hall element, and the rotor assembly is rotated when there is water flow through the sensing means 183, thereby measuring the magnetic physical quantity using the hall effect of the hall element.
A controller 17 is provided in the housing 10 for detecting and controlling the operation of the circuit devices in the gas-fired water heating apparatus. In some embodiments, the controller 17 may be a control circuit including a processor and a memory, and several electronic components connected in a wired manner. The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. The general purpose processor may be a microprocessor or any conventional processor. In this embodiment, the processor is the control center for the gas fired water heating appliance, which connects the various parts of the appliance using various interfaces and lines. For example, the controller 17 is electrically connected to or wirelessly communicates with the ignition device 121, the flame detection device 122, the gas valve 15, the blower 16, the inlet and outlet water temperature detection elements 181 and 182, and the flow rate detection device 183.
The memory may be used to store instructions for any application or method operating on the processor described above, as well as various types of data. The processor implements various functions of the gas fired water heating apparatus by running or executing programs or instructions stored in the memory and calling up data stored in the memory. The memory may comprise any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), magnetic memory, flash memory, solid-state memory, magnetic or optical disks, or the like.
Reference is made to an embodiment of the controller shown in fig. 2. In the present embodiment, the controller 17 includes a memory 171 for storing the set temperature Ts, a PID parameter determination unit 172, and a PID control unit 173. One or more of the elements described above may be a sequence of computer program instruction segments for describing the execution of these computer programs on a processor capable of performing the specified functions. The following describes, in conjunction with the steps of the start control method of the gas-fired water heating apparatus in the embodiment shown in fig. 3, the functions of the above units when the processor in the controller 17 executes the computer programs.
Step 201: and (5) igniting.
When the device is in a standby state, when the flow detection device 183 detects that there is water flow in the pipeline and the water flow reaches a starting flow threshold, the controller 17 ignites the air and gas mixture through the ignition device 121, and judges whether ignition is successful through the flame detection device 122.
Step 202: and acquiring a set temperature Ts, a water flow M, a water inlet temperature Ti and a water outlet temperature To.
The processor of the controller 17 reads the set temperature Ts stored in the memory, i.e., the set outlet water temperature. The set temperature is usually input and stored in the memory by the user through an operation button on a panel of the gas water heater or on a remote controller, or an application program on a communication terminal (such as a mobile phone) for controlling the operation of the device, via a wired or wireless network based on a communication standard. The memory stores the preset outlet water temperature when leaving the factory, if the user does not input a new set temperature Ts, the preset temperature can be read, otherwise, the latest set temperature Ts input by the user can be read. The controller 17 is also configured To detect the water flow rate M by the flow rate detection means 183, the water inlet temperature Ti by the water inlet temperature detection element 181, and the actual water outlet temperature To by the water outlet temperature detection element 182.
Step 203: the first heat load Q1 is calculated based on the set temperature Ts, the current water flow M, and the current inlet water temperature Ti.
The first thermal load Q1 may be calculated by the following equation: q1 ═ mxΔ T1, where Δ T1 ═ Ts-Ti. Ts is the set leaving water temperature, usually Δ T — To. The reason why the inlet water temperature Ti is used instead of the outlet water temperature To is that the inlet water temperature Ti is much lower than the outlet water temperature To, so that a large heat load can be calculated based on the inlet water temperature Ti, thereby facilitating the outlet water temperature To be raised more quickly in the initial heating stage.
With reference to the embodiment shown in fig. 2, the first thermal load Q1 may be obtained by a PID control module. In this embodiment, the controller 17 further includes a PID parameter determination unit 172, and a PID control unit 173. The PID parameter determining unit 172 determines the control parameter of the PID according to the current water flow rate M and the difference Δ T1 between the set temperature Ts and the current inlet water temperature Ti. The PID control parameters include a proportional parameter Kp, an integral parameter Ki, and a derivative parameter Kd, which may be determined by lookup from a look-up table previously stored in memory based on the water flow rate M and Δ T1, or may be calculated by some empirical formula. In some embodiments, the integral parameter Ki and the derivative parameter Kd may both be zero, and only the proportional parameter Kp may be determined, in fact, the load control in this case becomes an open-loop control, which is beneficial To make the outlet water temperature To approach the set temperature Ts faster because a large amount of calculations in the integral and derivative links are avoided. At this time, the PID control unit 173 obtains the first heat load Q1 from the input PID control parameter (only the proportional parameter Kp in the present embodiment). For example, the load calculation formula at time j may be: q1(j) ═ a × kp (j) × m (j) (ts (j) -ti (j)). Wherein, a is a load calculation coefficient, Ts (j) and Ti (j) are set temperature and inlet water temperature values at the moment j, and Kp (j) is a proportional parameter at the moment j.
Step 204: and controlling the operation of the air valve and/or the fan according to the first heat load Q1.
The controller 17 adjusts the opening of the air valve 15 according to the obtained first heat load Q1, and in some embodiments, further adjusts the rotation speed of the fan to adapt to the current opening of the air valve. Since the adjustment of the air valve opening and the fan operation is well known to those skilled in the art, the applicant is not further described herein. In some embodiments, the combustor 12 can adjust the thermal load more finely by controlling combustion in stages through stage valves on the gas-separation frame, and in these embodiments, the controller 17 will further control the opening and closing of the stage valves.
Step 205: and judging whether the difference value between the set temperature Ts and the current outlet water temperature To is less than or equal To a first temperature threshold T1.
The controller 17 controls the combustion operation according To the first heat load Q1 so that the water temperature To can be quickly raised after the device is started. In this process, the controller 17 also monitors the outlet water temperature To and determines whether the outlet water temperature is close enough To the set temperature Ts, that is, whether the difference between the set temperature Ts and the current outlet water temperature To is less than or equal To a first temperature threshold T1, for example, T1 is 5 ℃. If not, go back to step 203; if it is reached, indicating that the outlet water temperature To is close To the set temperature Ts, the operation proceeds To step 206, i.e., the stable combustion operation stage.
Step 206: and when the difference value between the set temperature Ts and the current outlet water temperature To is less than or equal To a first temperature threshold T1, calculating a second heat load Q2 according To the set temperature Ts, the current water flow M and the current outlet water temperature To.
The second thermal load Q2 may be calculated by the following equation: q2 ═ mxΔ T2, where Δ T2 ═ Ts-To. In some embodiments, the second thermal load Q2 may be obtained by a PID control module. Referring To fig. 2, the PID parameter determining unit 172 determines the control parameter of the PID according To the current water flow rate M and the difference Δ T2 between the set temperature Ts and the current outlet water temperature To. The PID control parameters include a proportional parameter Kp, an integral parameter Ki, and a derivative parameter Kd, which may be determined by lookup from a look-up table previously stored in memory based on the water flow rate M and Δ T2, or may be calculated by some empirical formula. Subsequently, the PID control unit 173 obtains the second heat load Q2 from the input PID control parameter. For example, the load calculation formula at time j may be:
q2(j) b × { kp (j) x (Ts (j) -To (j)) + ki (j) x Σ (Ts (j) -To (j)) + kd (j) x [ (Ts (j) -To (j)) ] }. Wherein b is a load calculation coefficient; ts (j) and to (j) set temperature and effluent temperature values for the moment j; ts (j-1) and To (j-1) are set temperature and effluent temperature values at the moment (j-1); kp (j) is a proportional parameter at the moment j; ki (j) is an integral parameter at time j; kd (j) is the differential parameter at time j.
Step 207: and controlling the operation of the air valve and/or the fan according to the second heat load Q2.
The controller 17 adjusts the opening of the air valve 15 according to the obtained second heat load Q2, and in some embodiments, further adjusts the rotation speed of the fan to adapt to the current opening of the air valve. Since the adjustment of the air valve opening and the fan operation is well known to those skilled in the art, the applicant is not further described herein. In some embodiments, the combustor 12 can adjust the thermal load more finely by controlling combustion in stages through stage valves on the gas-separation frame, and in these embodiments, the controller 17 will further control the opening and closing of the stage valves.
The gas water heating equipment disclosed above controls combustion operation based on the inlet water temperature at the beginning of starting to rapidly raise the outlet water temperature, so that the water temperature stabilization time is not too long even if the gas water heating equipment is started under a large flow rate; in addition, when the outlet water temperature is close to the set temperature, the stable operation of combustion is controlled based on the outlet water temperature, and then the overshoot is avoided.
Referring to another embodiment of the controller shown in fig. 4. In this embodiment, the controller 37 includes a memory 371 for storing the set temperature Ts, a disturbance determination unit 372, a disturbance direction determination unit 373, a PID parameter determination unit 374, and a PID control unit 375. One or more of the elements described above may be a sequence of computer program instruction segments for describing the execution of these computer programs on a processor capable of performing the specified functions. The following describes, in conjunction with the steps of the disturbance compensation control method of the gas-fired water heating apparatus in an embodiment shown in fig. 5, the functions of the units described above when the processor in the controller 37 executes the computer programs.
Step 401: the controller controls the air valve and the fan to enable the device to be in a stable combustion operation state.
Step 402: and acquiring a set temperature Ts, water flow M and an outlet water temperature To.
The processor of the controller 37 reads the set temperature Ts stored in the memory, detects the water flow rate M by the flow rate detection device 183, and detects the actual outlet water temperature To by the outlet water temperature detection element 182.
Step 403: and judging whether disturbance exists or not. In some embodiments, the perturbation factors include water flow fluctuations and changes in set temperature.
With reference to fig. 4, when the disturbance determining unit 372 determines whether there is a disturbance according to the water flow rate M, in some embodiments, the disturbance determining unit 372 determines whether the fluctuation amplitude | Δ M | of the water flow rate M is greater than or equal to a flow threshold value M1, where M1 is, for example, 2 liters/minute. The fluctuation range of the water flow is determined according to the difference between the flow value acquired in the current sampling period and the average value of the flow values acquired in the previous sampling periods. For example, the average value of water flow rate Mave of the first 5 sampling periods is obtained as (Mi + Mi-1+. + Mi-4)/5, and then the difference | Δ M | ═ Mi +1-Mave | between the flow rate value of the current sampling period and the average value of flow rate of the first 5 sampling periods is calculated. When | Δ M | ≧ M1, go to the next step 404, otherwise, go back to step 401.
When the disturbance determining unit 372 determines whether there is a disturbance according to the set temperature Ts, in some embodiments, the disturbance determining unit 372 determines that the variation amplitude | Δ Ts | of the set temperature Ts is greater than or equal to a second temperature threshold T2, where T2 is, for example, 2 ℃. For example, if the user changes the set temperature Ts, the processor determines the variation range | Δ Ts | of the set temperature according to the difference between the current set temperature and the previous set temperature read from the memory. If | Δ Ts | ≧ T2, go to the next step 404, otherwise, go back to step 401.
Step 404: the disturbance direction D is determined.
The disturbance direction determination unit 373 determines the disturbance direction. For example, if the water flow rate M increases or the set temperature Ts becomes greater, D is assigned a value of 1, indicating that positive load compensation is required; conversely, if the water flow rate M decreases or the set temperature Ts decreases, D is assigned a value of-1, indicating that negative load compensation is required.
Step 405: and calculating a third heat load Q3 according To the current set temperature Ts, the current water flow M, the current outlet water temperature To and the disturbance direction D.
The value of the third thermal load Q3 may be calculated by the following equation: q3 ═ mxΔ T3, where Δ T3 ═ Ts-To. After the value of Q3 is calculated, positive or negative compensation is performed according to the disturbance direction D. In some embodiments, the value of the third thermal load Q3 may be calculated by a PID control module. Referring To fig. 4, the PID parameter determining unit 374 determines the control parameter of the PID according To the current water flow rate M and the difference Δ T3 between the current set temperature Ts and the current leaving water temperature To. The PID control parameters include a proportional parameter Kp, an integral parameter Ki, and a derivative parameter Kd, which may be determined by lookup from a look-up table previously stored in memory based on the water flow rate M and Δ T3, or may be calculated by some empirical formula. Subsequently, the PID control unit 375 calculates the value of the third heat load Q3 according to the input PID control parameter. For example, the load calculation formula at time j may be:
q3(j) c × { kp (j) x (Ts (j) -To (j)) + ki (j) x Σ (Ts (j) -To (j)) + kd (j) x [ (Ts (j) -To (j)) ] }. Wherein c is a load calculation coefficient; ts (j) and to (j) set temperature and effluent temperature values for the moment j; ts (j-1) and To (j-1) are set temperature and effluent temperature values at the moment (j-1); kp (j) is a proportional parameter at the moment j; ki (j) is an integral parameter at time j; kd (j) is the differential parameter at time j. And finally, determining positive load compensation or negative load compensation according to the disturbance direction D.
Step 406: and controlling the operation of the air valve and/or the fan according to the third heat load Q3.
The controller 37 adjusts the opening of the air valve 15 according to the obtained third heat load Q3, and in some embodiments, further adjusts the rotation speed of the fan to adapt to the current opening of the air valve. Since the adjustment of the air valve opening and the fan operation is well known to those skilled in the art, the applicant is not further described herein. In some embodiments, the combustor 12 can adjust the thermal load more finely by controlling combustion in stages through stage valves on the gas-separation frame, and in these embodiments, the controller 37 will further control the opening and closing of the stage valves.
Step 407: whether the difference between the current set temperature Ts and the current leaving water temperature To is less than or equal To a third temperature threshold T3, such as 1 ℃, is determined. In some embodiments, the difference may also be an absolute value | Ts-To |. If the Ts-To is less than or equal To T3, which indicates that disturbance caused by factors such as water flow fluctuation or set temperature change is overcome, returning To the step 401, namely exiting the current disturbance compensation control and entering a stable combustion operation stage; otherwise, the process returns to step 404 to continue the current disturbance compensation control.
The gas water heating equipment disclosed above can identify disturbance factors and determine the disturbance direction, so that disturbance compensation control is timely performed when disturbance occurs, and the water temperature affected by the disturbance can be quickly stabilized.
All or part of the steps in the methods of the above-disclosed embodiments may be implemented by a computer program instructing associated hardware. The computer program may be stored in a computer readable storage medium, which when executed by a processor, may implement the steps of the various method embodiments described above. Wherein the computer program comprises computer program code which may be in the form of source code, object code, an executable file or some intermediate form, etc. The readable storage medium may comprise any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), magnetic memory, flash memory, solid-state memory, magnetic or optical disks, or the like.
It should be understood that the methods and apparatus disclosed in the foregoing disclosure may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and the division of the units in the controller is merely a division of one logic function, and there may be other divisions when actually implementing, for example, a plurality of units may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the components, elements and units discussed above may be connected to each other electrically, mechanically or in other forms; the connection can be direct connection or indirect connection through some interfaces and the like; either wired or wireless.
In addition, the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; some or all of the elements can be selected according to actual needs to achieve the purpose of the solution of the disclosed embodiments. In addition, each functional unit in the above embodiments may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (10)
1. A disturbance compensation control method for gas water heating equipment is disclosed, wherein the gas water heating equipment comprises a burner, a heat exchanger, an air valve, a fan, an outlet water temperature detection element, a flow detection device and a controller; the method is characterized in that: the method comprises
Acquiring a set temperature, water flow and an outlet water temperature;
when the water flow fluctuates and the fluctuation amplitude is larger than or equal to the flow threshold value, or the set temperature changes and the change amplitude is larger than or equal to the second temperature threshold value, determining the disturbance direction;
determining a third heat load according to the current set temperature, the current water flow, the current water outlet temperature and the disturbance direction;
and controlling the air valve and/or the fan to operate according to the third heat load.
2. The method of claim 1, wherein: the fluctuation range of the water flow is determined according to the difference between the flow value obtained in the current sampling period and the average value of the flow values obtained in the previous sampling periods.
3. The method of claim 1, wherein: the change range of the set temperature is determined according to the difference value between the current set temperature and the previous set temperature.
4. The method of claim 1, wherein: determining the third thermal load according to the current set temperature, the current water flow, the current effluent temperature and the disturbance direction comprises
Determining a PID control parameter according to the current water flow and the difference value between the set temperature and the current water outlet temperature;
and inputting the PID control parameters into a PID control unit to calculate the value of the third heat load, and determining the third heat load according to the disturbance direction.
5. The method of claim 1, wherein: the method further comprises exiting the disturbance compensation control when the difference between the current set temperature and the current outlet water temperature is less than or equal to a third temperature threshold.
6. A gas-fired water heating apparatus characterized by: the gas water heating equipment comprises a burner for burning a mixture of gas and air, a heat exchanger for absorbing heat generated by the burner and transferring the heat to water flowing through the heat exchanger, an air valve for controlling gas supply, a fan for driving air to flow, an outlet water temperature detection element for detecting water temperature, a flow detection device for detecting water flow, a controller connected or communicated with the air valve, the fan, the outlet water temperature detection element and the flow detection device, and a storage unit; the controller comprises a disturbance judging unit and a disturbance direction determining unit; the controller is configured to
Acquiring a set temperature, detecting water flow through a flow detection device, and detecting water temperature through an outlet water temperature detection element;
the disturbance judging unit judges whether disturbance exists according to the water flow or the set temperature, and when the water flow fluctuates and the fluctuation amplitude is larger than or equal to the flow threshold value, or the set temperature changes and the change amplitude is larger than or equal to the second temperature threshold value, the disturbance direction determining unit determines the disturbance direction;
determining a third heat load according to the current set temperature, the current water flow, the current water outlet temperature and the disturbance direction;
and controlling the air valve and/or the fan to operate according to the third heat load.
7. The gas-fired water heating apparatus according to claim 6, wherein: the fluctuation amplitude of the water flow is determined according to the difference between the flow value detected in the current sampling period and the average value of the flow values detected in the previous sampling periods.
8. The gas-fired water heating apparatus according to claim 6, wherein: the change range of the set temperature is determined according to the difference value between the current set temperature and the previous set temperature.
9. The method of claim 1, wherein: the controller also comprises a PID parameter determining unit and a PID control unit; the controller is configured to determine that the third thermal load includes a current set point temperature, a current water flow, a current leaving water temperature, and a disturbance direction
The PID parameter determining unit determines a PID control parameter according to the current water flow and the difference value between the set temperature and the current outlet water temperature;
and the PID control unit calculates the value of the third heat load according to the input PID control parameter and determines the third heat load according to the disturbance direction.
10. A computer-readable storage medium having instructions stored thereon, characterized in that: the instructions, when executed by a processor, implement the method of any one of claims 1-5.
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