CN112524816B - Temperature control method and device for gas water heater and gas water heater - Google Patents
Temperature control method and device for gas water heater and gas water heater Download PDFInfo
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- CN112524816B CN112524816B CN202011413524.5A CN202011413524A CN112524816B CN 112524816 B CN112524816 B CN 112524816B CN 202011413524 A CN202011413524 A CN 202011413524A CN 112524816 B CN112524816 B CN 112524816B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
Abstract
The embodiment of the invention provides a temperature control method and device for a gas water heater and the gas water heater; the temperature control method for the gas water heater comprises the following steps: under the condition that the water heater is in a first state, determining a feedforward control quantity for controlling the heating equipment according to the received feedforward signal; under the condition that the water heater is in the second state, the pre-feedback signal and the post-feedback signal are transmitted to the extended observer to determine the total disturbance quantity; the active disturbance rejection controller receives the total disturbance quantity and carries out disturbance compensation on the feedforward control quantity according to the total disturbance quantity; the prepositive feedback signal comprises at least one of target water outlet temperature, inflow water flow and inflow water temperature; the post-feedback signal comprises the outlet water temperature; the user can not be because in the adjustment process, perhaps gas heater leads to the condition that water is suddenly cold and suddenly hot to appear because the change of city water to give the better use experience of user.
Description
Technical Field
The invention relates to the technical field of kitchen and bathroom electrical appliances, in particular to a temperature control method and device for a gas water heater and the gas water heater.
Background
With the progress of society, the living standard of people is higher and higher, and the requirement on the bathing experience is gradually improved. The instant gas water heater is an ideal choice for many families due to the advantages of small volume, low price, high heating speed, convenient use and the like; but the outlet water temperature is easy to fluctuate up and down under the influence of external factors; such as: fluctuation of water inlet flow, change of water inlet temperature, external reverse flow and the like.
In order to solve the interference caused by the change of the external environment, the combustion power needs to be properly adjusted according to the external conditions so as to achieve the best bathing experience.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a temperature control method and device for a gas water heater, the gas water heater and a machine readable storage medium.
In order to achieve the above object, in a first aspect of the present invention, there is provided a temperature control method for a gas water heater, the temperature control method comprising: under the condition that the water heater is in a first state, determining a feedforward control quantity for controlling the heating equipment according to the received feedforward signal; under the condition that the water heater is in the second state, the pre-feedback signal and the post-feedback signal are transmitted to the extended observer to determine the total disturbance quantity; the active disturbance rejection controller receives the total disturbance quantity and carries out disturbance compensation on the feedforward control quantity according to the total disturbance quantity; the prepositive feedback signal comprises at least one of target water outlet temperature, inflow water flow and inflow water temperature; the post-feedback signal includes the outlet water temperature.
In an embodiment of the present application, the method further comprises: receiving a pre-feedback signal and a post-feedback signal; determining that the gas water heater is in a first state or a second state according to the front feedback signal and the rear feedback signal; the first state comprises at least one of a starting temperature rise stage, a single change of water quantity, a transition state for switching to a constant temperature control state and a switch sectional valve; the second state includes at least one of a thermostatic control state and a continuous fluctuation of the water amount.
In an embodiment of the application, determining a feedforward control quantity for controlling the heating device based on the received feedforward signal comprises: receiving inflow water flow, inflow water temperature and target outflow water temperature; determining temperature regulating quantity according to the water inlet temperature and the target water outlet temperature; and determining a feed-forward control quantity for controlling the heating equipment according to the temperature regulating quantity and the water inlet flow.
In the embodiment of the present application, transmitting the feedforward signal and the postfeedback signal to the extended observer to determine the total disturbance amount includes: transmitting the outlet water temperature, the inlet water flow and the inlet water temperature to an extended observer; and determining the total disturbance quantity according to the disturbance quantity of the water outlet temperature, the disturbance quantity of the water inlet flow and the disturbance quantity of the water inlet temperature determined by the extended state observer.
In this application embodiment, the heating apparatus includes a proportional valve and a plurality of segment valves and fire rows connected in sequence with the proportional valve, and the temperature control method further includes: converting the feedforward control quantity into a secondary pressure; converting the secondary voltage into a pulse width modulation signal; the opening of the proportional valve is controlled by a pulse width modulation signal.
In an embodiment of the present application, the temperature control method further includes: presetting a mapping relation between a pulse width modulation signal and a switching combination of a segment valve; and matching the corresponding switch combination according to the pulse width modulation signal.
In the embodiment of the present application, the receiving, by the active disturbance rejection controller, the total disturbance quantity, and performing disturbance compensation on the feedforward control quantity according to the total disturbance quantity includes: controlling an active disturbance rejection controller to receive the total disturbance quantity; determining a feedforward proportion of a feedforward control quantity; the active disturbance rejection controller converts the total disturbance quantity into a feedback control quantity; the feedforward control amount is multiplied by the feedforward proportion and added to the feedback control amount to compensate for the disturbance.
In the embodiment of the application, the method also comprises the steps of controlling the heating equipment to heat the water by adopting the feedforward control quantity in a first state; and in a second state, controlling the heating equipment to heat the water by adopting the feedforward control quantity after disturbance compensation.
In a second aspect of the present application, an embodiment of the present invention further provides a temperature control apparatus for a gas water heater, including a heating device for heating water; the feedforward controller is used for receiving the feedforward signal to determine a feedforward control quantity for controlling the heating equipment; the extended observer is used for receiving the front feedback signal and the rear feedback signal and calculating the total disturbance quantity through an active disturbance rejection control algorithm; the active disturbance rejection controller is used for receiving the total disturbance quantity and carrying out disturbance compensation on the feedforward control quantity according to the total disturbance quantity; a processor configured to: under the condition that the water heater is in a first state, determining a feedforward control quantity for controlling the heating equipment according to the received feedforward signal; under the condition that the water heater is in the second state, the total disturbance quantity is determined by transmitting the pre-feedback signal and the post-feedback signal to the extended observer; controlling an active disturbance rejection controller to receive the total disturbance quantity and carrying out disturbance compensation on the feedforward control quantity according to the total disturbance quantity; wherein the pre-feedback signal comprises a target temperature and at least one of inflow water flow and inflow water temperature before heating; the post-feedback signal includes the heated outlet water temperature.
In an embodiment of the application, the processor is further configured to: and receiving the pre-feedback signal and the post-feedback signal, and determining that the water heater is in a first state or a second state according to the pre-feedback signal and the post-feedback signal.
In an embodiment of the present application, the temperature control apparatus further includes: a flow sensor for detecting the flow of the intake water; a first temperature sensor for detecting the temperature of the intake water; a second temperature sensor for detecting a temperature of water; the first state comprises at least one of a starting temperature rise stage, a single change of water quantity, a transition state for switching to a constant temperature control state and a switch sectional valve; the second state includes at least one of a constant temperature control state and a continuous fluctuation of the water amount.
In an embodiment of the application, the processor being configured to determine a feedforward control quantity for controlling the heating device from the received feedforward signal comprises the processor being configured to: receiving inflow water flow, inflow water temperature and target temperature; determining a regulation temperature according to the inlet water temperature and the target temperature; and determining the feedforward control quantity for controlling the heating equipment according to the regulated temperature and the inflow water flow.
In the embodiment of the application, a first input end of the extended observer is connected with a flow sensor and a first temperature sensor; the second input end is connected with a second temperature sensor and used for receiving the inflow water flow, the inflow water temperature and the outflow water temperature; the processor being configured to determine the total disturbance quantity by transmitting the feedforward signal, the postfeedback signal to the extended observer comprises the processor being configured to: the outlet water temperature, the inlet water flow and the inlet water temperature are transmitted to the extended observer; and controlling the extended state observer to determine the disturbance quantity of the water temperature, the disturbance quantity of the water inlet flow and the disturbance quantity of the water inlet temperature to determine the total disturbance quantity.
In an embodiment of the present application, the heating device includes a proportional valve and a plurality of segment valves and fire bars connected in sequence by the proportional valve, and the processor is further configured to: converting the feedforward control quantity into a secondary pressure; converting the secondary voltage into a pulse width modulation signal; the opening of the proportional valve is controlled by a pulse width modulation signal.
In the embodiment of the present application, controlling the active disturbance rejection controller to receive the total disturbance quantity and perform disturbance compensation on the feedforward control quantity according to the total disturbance quantity includes: controlling an active disturbance rejection controller to receive the total disturbance quantity; determining a feedforward proportion of a feedforward control quantity; converting the total disturbance quantity into a feedback control quantity through an active disturbance rejection controller; and multiplying the feedforward control quantity by a feedforward proportion and accumulating the feedforward control quantity and the feedback control quantity to compensate the disturbance.
In an embodiment of the present application, the method further comprises: in a first state, controlling heating equipment to heat water by adopting feed-forward control quantity; and in a second state, controlling the heating equipment to heat the water by adopting the feedforward control quantity after disturbance compensation.
In a third aspect of the present application, a gas water heater is further provided, which includes a water heater body, and further includes the temperature control device as described above.
In another aspect, a computer readable storage medium having stored thereon instructions for enabling a processor to perform the method for a gas water heater according to the above when executed by the processor is provided.
According to the technical scheme, the mapping relation between the pre-feedback signal and the post-feedback signal and the first state and the second state are established, then the pre-feedback signal and the post-feedback signal are received in real time to match the corresponding working condition under the current condition, namely the first state or the second state, and the gas water heater is controlled through the feedforward control quantity under the condition that the gas water heater is located at the first state, so that the water temperature required by a user is met. And when the gas water heater is in the second state, performing disturbance compensation through a composite control law. Thereby realize water heater thermostatic control, the user can not be because in the adjustment process, perhaps gas heater leads to the condition that water suddenly cooled suddenly and suddenly heated to appear because the change of city water, thereby give the better use experience of user. Give the user more accurate temperature, improve user's use experience.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of a temperature control method for a gas water heater provided by an embodiment of the present invention;
FIG. 2 is another flow chart of a temperature control method for a gas water heater provided by an embodiment of the present invention;
fig. 3 is a flowchart of step S201 in the temperature control method for a gas water heater according to the embodiment of the present invention;
FIG. 4 is a flowchart of step S202 of the temperature control method for a gas water heater according to an embodiment of the present invention;
FIG. 5 is a flowchart of step S203 of the temperature control method for a gas water heater according to the embodiment of the present invention; and
FIG. 6 is a flow chart of a temperature control method for a gas water heater provided by an embodiment of the present invention;
FIG. 7 is a further flow chart of a temperature control method for a gas water heater provided by an embodiment of the present invention;
FIG. 8 is a further flow chart of a method for temperature control of a gas water heater according to an embodiment of the present invention; and
fig. 9 is a connection topology diagram of a temperature control device for a gas water heater provided by an embodiment of the invention.
Description of the reference numerals
100. A device;
10. a heating device; 20. A feedforward controller;
30. expanding the observer; 40. An active disturbance rejection controller;
50. a flow sensor; 60. A first temperature sensor;
70. a second temperature sensor; 81. A proportional valve;
82. a segment valve; 83. And (4) discharging fire.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B" including either scheme A, or scheme B, or a scheme in which both A and B are satisfied. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The embodiment of the invention mainly provides a temperature control method for a gas water heater, in particular to a method for controlling the constant temperature of the gas water heater, which aims to solve the problem that the actual temperature of the existing instant heating type gas water heater cannot reach the temperature required by a user due to the influence of user operation or other environment influences when water flows out, and the use experience of the user is influenced.
Referring to fig. 1, fig. 1 is a flowchart of a temperature control method for a gas water heater according to an embodiment of the present invention. The temperature control method comprises the following steps:
step S201: under the condition that the water heater is in a first state, determining a feedforward control quantity for controlling the heating equipment according to the received feedforward signal;
step S202: under the condition that the water heater is in the second state, the pre-feedback signal and the post-feedback signal are transmitted to the extended observer to determine the total disturbance quantity;
step S203: the active disturbance rejection controller receives the total disturbance quantity and carries out disturbance compensation on the feedforward control quantity according to the total disturbance quantity;
the prepositive feedback signal comprises at least one of target water outlet temperature, inflow water flow and inflow water temperature; the post-feedback signal includes the outlet water temperature.
Specifically, the term "first state" referred to in the above step S201 refers to a state in which there is less disturbance on the constant temperature maintenance when the water heater is at a single change in water temperature, water flow. Such as including: the water heater is in at least one of a starting-up temperature-rising stage, a transition state of single change of water quantity of city water regulated and controlled by a user, switching to a constant temperature control state and opening or closing a sectional valve;
the term "second state" referred to in the above step S201 refers to when the water heater is in a state where there is much disturbance to the constant temperature maintenance, such as at least one of a constant temperature control state, and a continuous fluctuation of the amount of water.
It should also be understood by those skilled in the art that more states can be added to the technical teaching provided by the above "first state" and "second state" to enable the gas water heater to have corresponding thermostatic control in more modes, and the invention also falls within the protection scope covered by the present invention.
Further, in the above description, when the water heater is in the first state, the feedforward control amount for controlling the heating device is determined according to the received feedforward signal, and the temperature control method provided by the embodiment of the invention controls the heating device to heat through the feedforward signal when the water heater is in a state where the disturbance amount to the constant-temperature heating is small. The pre-feedback signal comprises at least one of a target outlet water temperature, an inlet water flow and an inlet water temperature, wherein the target outlet water temperature is a target temperature set by a user or automatically required to be heated by the system, the inlet water flow is the flow of the city water passing through the heating equipment, and the inlet water temperature is the original temperature of the city water passing through the heating equipment.
It is to be understood that the power of the heating device may be controlled for heating by a feed-forward control quantity by a feedforward feedback signal including at least one or more of a target outlet water temperature, inlet water flow, and inlet water temperature. Specifically, for some gas water heaters with low requirement precision, the water inlet flow and the water inlet temperature are both stable values under normal conditions due to the fact that the water is city water, and the power of the heating device can be determined only according to the target water outlet temperature.
In step S201, the water temperature is controlled to the target outlet water temperature through the water heater without interference cancellation, so as to ensure that the temperature meets the requirement of the user, and if the temperature is set to 40 degrees by the user, the heating device is controlled to heat the water to 40 degrees through the feedforward control amount.
When the water heater is in the second state, for example, a user increases or adjusts the water volume for bathing, so that fluctuation of the water volume is caused, under a traditional control mode, the water heater is usually suddenly cooled and heated, so that the user experience is extremely poor, in the steps from S202 to S203, namely, the total disturbance amount is calculated and eliminated in a final control law according to the post-feedback signal monitored by the extended observer through an active disturbance rejection control algorithm, so that the target water outlet temperature is kept constant, and the better shower experience is provided for the user.
In an embodiment of the invention, optionally the first state and the second state are automatically determined by a pre-feedback signal and a post-feedback signal. Referring to fig. 2, fig. 2 is another flow chart of a temperature control method for a gas water heater according to an embodiment of the present invention. The temperature control method further comprises the following steps:
step S101, receiving a front feedback signal and a rear feedback signal;
step S102, determining that the gas water heater is in a first state or a second state according to the front feedback signal and the rear feedback signal;
the optional first state comprises a starting temperature rise stage, a single change of water quantity, a transition state for switching to a constant temperature control state and a switch sectional valve;
the second state comprises a constant temperature control state and continuous fluctuation of water quantity.
It can be understood that the pre-feedback signal and the post-feedback signal are both obtained by the detection of the sensor, and the pre-feedback signal and the post-feedback signal fed back by the sensor in real time are determined according to the mapping relation between the pre-feedback signal and the post-feedback signal and the mapping relation corresponding to the first state or the second state, so that the gas water heater is determined to be in the first state or the second state at present.
According to the first state and the second state provided by the embodiments of the present invention, the temperature control process provided by the embodiments of the present invention can be divided into six stages: 1. starting up and raising the temperature; 2. a constant temperature control state; 3. the water amount is changed for a single time; 4. the water quantity continuously fluctuates; 5. a transition state to constant temperature control; 6. switching a segment valve; wherein, in 2 constant temperature control state, 4 water quantity continuous fluctuation state, using feedforward control to match with active disturbance rejection control algorithm, and in other four states, using feedforward control.
Referring to fig. 3, fig. 3 is a flowchart of step S201 of the temperature control method for a gas water heater according to the embodiment of the present invention. Determining the feedforward control amount for controlling the heating apparatus from the received feedforward signal in step S201 may include the steps of:
step S2011, receiving the inflow water flow, the inflow water temperature and the target outflow water temperature;
step S2012, determining a temperature regulating quantity according to the water inlet temperature and the target water outlet temperature;
and step S2013, determining a feedforward control quantity for controlling the heating equipment according to the temperature regulating quantity and the water inlet flow.
The device for keeping constant temperature mainly comprises the following feed-back quantity: inflow (F), inflow temperature (T)i) Set temperature (V), post feedback amount: temperature of water outlet (T)o)。
It will be appreciated that from step S2011 to step S2013, the feed-forward control is based on the known feed-water temperature Ti(obtained by a temperature sensor) and ideal outlet water temperature To(target outlet water temperature) and inlet water flow, the heat load required by the instant gas hot water to reach the ideal outlet water temperature can be calculated, and the feedforward control quantity can be further calculated:
u1＝α(To-Ti) F (formula 1)
In equation 1, where α is the gain from the thermal load to the feedforward control quantity, and for a gas water heater, the control quantity is the opening degree of a gas valve, i.e., the proportional valve current of the control valve or the duty ratio (PWM) of the switching power supply, the gain α is determined according to the data of multiple sets of open loop experiments. The feedforward control quantity can be obtained through feedforward control, so that the heating equipment is heated to the preset target outlet water temperature.
In some embodiments, a feedback algorithm may be used to increase the efficiency of the control, such as a PID negative feedback control algorithm to calculate the amount of feedforward control. Also fall within the scope of protection covered by the invention.
Referring to fig. 4, fig. 4 is a flowchart of step S202 in the temperature control method for a gas water heater according to the embodiment of the present invention. The transmitting the feedforward signal and the postfeedback signal to the extended observer in the step S202 to determine the total disturbance amount includes:
step S2021, transmitting the outlet water temperature, the inlet water flow and the inlet water temperature to an extended observer;
and step S2022, determining the total disturbance quantity according to the disturbance quantity of the water outlet temperature, the disturbance quantity of the water inlet flow and the disturbance quantity of the water inlet temperature determined by the extended state observer.
Specifically, in step S2021 to step S2022, according to the algorithm idea of ADRC and the previous analysis, the order of the controlled object selected herein is first order, as shown in the following formula:
in formula 2, B is the input disturbance gain, y is the output quantity, and Ax + d is regarded as the "total disturbance" in the ADRC control system, wherein the core component ESO (extended state observer) estimates the value of the "total disturbance" in real time according to the state variable x and the system input u (t), and eliminates the value in the final control law, thereby completing the thermostatic control.
Referring to fig. 5, fig. 5 is a flowchart of step S203 of the temperature control method for a gas water heater according to the embodiment of the present invention. The active disturbance rejection controller receives the total disturbance quantity, and carries out disturbance compensation on the feedforward control quantity according to the total disturbance quantity, wherein the disturbance compensation comprises the following steps:
step S2031, controlling an active disturbance rejection controller to receive a total disturbance quantity;
step S2032, determining the feedforward proportion of the feedforward control quantity;
step S2033, the active disturbance rejection controller converts the total disturbance quantity into a feedback control quantity;
step S2034, the feedforward control amount is multiplied by the feedforward proportion and accumulated with the feedback control amount to perform disturbance compensation.
And (3) obtaining a final composite control law by adopting a feedforward and feedback accumulation mode:
u(t)＝u0(t)+Kffu1(t) (equation 3)
Wherein in formula 3, Kff∈[0，1]Is a feedforward proportion, and the larger the numerical value is, the more the proportion of the feedforward control quantity in the compound control law isIs large. u (t) is a complex control law, uo(t) is the total disturbance variable, u1Since (t) is the feedforward control amount, the disturbance compensation is performed by the complex control law in the second state. Thereby realize water heater thermostatic control, give the better use experience of user.
Referring to fig. 6, fig. 6 is a flowchart of a temperature control method for a gas water heater according to an embodiment of the present invention. The heating equipment comprises a proportional valve, a plurality of segment valves and a fire grate, wherein the segment valves and the fire grate are sequentially connected with the proportional valve, and in the embodiment of the invention, the temperature control method further comprises the following steps:
step S204, converting the feedforward control quantity into secondary pressure;
step S205, converting the secondary voltage into a pulse width modulation signal;
and step S206, controlling the opening of the proportional valve through the pulse width modulation signal.
It will be appreciated that the purpose of adjusting the secondary pressure is to adjust the mixing ratio of the gas and air. The primary pressure refers to the pressure of a gas pipe network before the gas pipe network reaches a gas valve of the water heater; the secondary pressure refers to the working pressure from the gas valve to the combustion chamber. The secondary pressure is adjusted to a proper value, so that the gas burner of the water heater can be adjusted to the best working state, and the situations of insufficient combustion, deflagration or incapability of ignition in the combustion chamber are prevented.
In order to solve the problem of consistency of the proportional valve in steps S204 to S206, the opening degree of the proportional valve has an error even under the same driving parameters, so the error of the proportional valve needs to be eliminated, and the error needs to be eliminated through the relationship among the thermal load, the secondary pressure and the PWM (pulse width modulation) value of the proportional valve; and a better control effect is obtained.
Referring to fig. 7, fig. 7 is a further flowchart of a temperature control method for a gas water heater according to an embodiment of the present invention. The temperature control method further includes:
step S207, presetting a mapping relation between a pulse width modulation signal and a switching combination of a segment valve;
and step S208, matching the corresponding switch combination according to the pulse width modulation signal.
Specifically, by presetting a mapping relationship between a pulse width modulation signal (PWM) and a combination of switching of the segment valves, for example, a ring-type arrangement of eight segment valves, an arrangement manner of the segment valves, for example, only four segment valves are opened, or eight segment valves are fully opened, may be mapped according to the pulse width modulation signal.
Referring to fig. 8, fig. 8 is a flowchart of a temperature control method for a gas water heater according to an embodiment of the present invention. The method further comprises the following steps:
step S301: in a first state, controlling heating equipment to heat water by adopting feed-forward control quantity;
step S302: and in a second state, controlling the heating equipment to heat the water by adopting the feedforward control quantity after disturbance compensation.
It is understood that steps S301 and S302 are to control the heating device to heat water by using the feedforward control amount when the gas water heater is in the first state, and to control the heating device to heat water by using the feedforward control amount after disturbance compensation in the second state, and this step is only a limitation to the embodiment of the present invention, and those skilled in the art can easily learn the technical teaching of this step through the contents of the above embodiment, and will not be described repeatedly here.
Referring to fig. 9, fig. 9 is a connection topology diagram of a temperature controller 100 for a gas water heater according to an embodiment of the present invention. In order to more clearly illustrate the above temperature control method, an embodiment of the present invention further provides a temperature control device 100 for a gas water heater, including:
a heating device 10 for heating water;
the proportional valve 81 is arranged at the air inlet of the heating device 10, and the heating device is controlled by the proportional valve 10 to heat;
the sectional valve 82 is communicated with the proportional valve 81 and used for adjusting the sectional operation, for example, the whole fire is used in winter, and the half-section fire is used in summer;
a fire bank 83, typically having 4 to 6 rows of nozzles, passing through the communicating segment valves for heating by the heating apparatus 10;
a feedforward controller 20 for receiving the feedforward signal to determine a feedforward control amount for controlling the heating device;
the extended observer 30 is used for receiving the pre-feedback signal and the post-feedback signal and calculating the total disturbance quantity through an active disturbance rejection control algorithm;
the active disturbance rejection controller 40 is used for receiving the total disturbance quantity and carrying out disturbance compensation on the feedforward control quantity according to the total disturbance quantity;
a flow sensor 50 disposed on a water inlet line communicating with the heating apparatus 10, for detecting a flow rate of the inlet water;
a first temperature sensor 60, which is arranged on a water inlet pipeline communicated with the heating device 10 and is used for detecting the temperature of inlet water;
a second temperature sensor 70 provided on a water outlet line communicating with the heating apparatus 10, for detecting a temperature of water;
a processor (not shown), which may be external or internal, the processor being configured to:
determining a feedforward control quantity for controlling the heating device 10 according to the received feedforward signal under the condition that the water heater is in the first state;
determining the total disturbance quantity by transmitting the pre-feedback signal and the post-feedback signal to the extended observer 30 under the condition that the water heater is in the second state;
controlling the active disturbance rejection controller 40 to receive the total disturbance quantity and carrying out disturbance compensation on the feedforward control quantity according to the total disturbance quantity;
wherein the pre-feedback signal comprises a target temperature and at least one of inflow water flow and inflow water temperature before heating; the post-feedback signal includes the heated outlet water temperature.
The processor is further configured to perform condition classification, i.e. the following steps need to be performed: receiving a pre-feedback signal and a post-feedback signal; determining that the gas water heater is in a first state or a second state according to the front feedback signal and the rear feedback signal;
the optional first state comprises a starting temperature rise stage, a single change of water quantity, a transition state for switching to a constant temperature control state and a switch sectional valve;
the second state comprises a constant temperature control state and continuous fluctuation of water quantity.
It can be understood that the mapping relation between the pre-feedback signal and the post-feedback signal and the first state and the second state is established through the pre-feedback signal and the post-feedback signal, and then the condition that the pre-feedback signal and the post-feedback signal are matched with the corresponding working condition at present, namely the first state or the second state, is received in real time.
The processor is further configured to perform the steps of: receiving inflow water flow, inflow water temperature and target outflow water temperature; determining temperature regulating quantity according to the water inlet temperature and the target water outlet temperature; and determining a feed-forward control quantity for controlling the heating equipment according to the temperature regulating quantity and the water inlet flow.
The device for keeping constant temperature mainly comprises the following feed-back quantity: inflow (F), inflow temperature (T)i) Set temperature (V), post feedback amount: temperature of water outlet (T)o)
The heating equipment comprises a proportional valve, a plurality of section valves and fire bars, wherein the section valves and the fire bars are sequentially connected with the proportional valve, and in the embodiment of the invention, the temperature control method further comprises the following steps: converting the feedforward control quantity into a secondary pressure; converting the secondary voltage into a pulse width modulation signal; the opening of the proportional valve is controlled by a pulse width modulation signal.
It will be appreciated that the purpose of adjusting the secondary pressure is to adjust the mixing ratio of the gas and air. The primary pressure refers to the pressure of a gas pipe network before the gas pipe network reaches a gas valve of the water heater; the secondary pressure refers to the working pressure from the gas valve to the combustion chamber. The secondary pressure is adjusted to a proper value, so that the gas burner of the water heater can be adjusted to the best working state, and the situations of insufficient combustion, deflagration or incapability of ignition in the combustion chamber are prevented.
The processor is further configured to: presetting a mapping relation between a pulse width modulation signal and a switching combination of a segment valve; and matching the corresponding switch combination according to the pulse width modulation signal.
It can be understood that the gas water heater is controlled by the feedforward control quantity under the condition that the gas water heater is in the first state so as to meet the water temperature required by the user.
The processor is further configured to: transmitting the outlet water temperature, the inlet water flow and the inlet water temperature to an extended observer; and determining the total disturbance quantity according to the disturbance quantity of the water outlet temperature, the disturbance quantity of the water inlet flow and the disturbance quantity of the water inlet temperature determined by the extended state observer. Controlling an active disturbance rejection controller to receive the total disturbance quantity; determining a feedforward proportion of a feedforward control quantity; the active disturbance rejection controller converts the total disturbance quantity into a feedback control quantity; the feedforward control amount is multiplied by the feedforward proportion and added to the feedback control amount to compensate for the disturbance.
It can be understood that when the gas water heater is in the second state, the disturbance compensation is performed through the compound control law. Thereby realize water heater thermostatic control, the user can not be because in the adjustment process, perhaps gas heater leads to the condition that water suddenly cooled suddenly and suddenly heated to appear because the change of city water, thereby give the better use experience of user.
It will also be understood by those skilled in the art that if the method or temperature control apparatus of the present invention is simply changed, the functions added to the above method are combined, or the apparatus is replaced, for example, the model material of each component is replaced, the use environment is replaced, the positional relationship of each component is simply replaced, etc.; or the products formed by the components are integrally arranged; or a detachable design; it is within the scope of the present invention to replace the methods and apparatus of the present invention with any method/apparatus/device that combines the components to form a method/apparatus/device with specific functionality.
The device also comprises a memory, the temperature control method for the gas water heater can be stored in the memory as a program unit, and the processor executes the program unit stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The inner core can be set to be one or more, and the temperature of the gas water heater is controlled by adjusting the parameters of the inner core.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
An embodiment of the present invention provides a machine-readable storage medium having a program stored thereon, which when executed by a processor, implements a temperature control method for a gas water heater.
The embodiment of the invention provides a processor, which is used for running a program, wherein the program executes a temperature control method for a gas water heater during running.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (18)
1. A temperature control method for a gas water heater, the temperature control method comprising:
under the condition that the water heater is in a first state, determining a feedforward control quantity for controlling the heating equipment according to the received feedforward signal;
under the condition that the water heater is in a second state, transmitting the pre-feedback signal and the post-feedback signal to an extended observer to determine a total disturbance quantity, receiving the total disturbance quantity by an active disturbance rejection controller, and performing disturbance compensation on the feedforward control quantity according to the total disturbance quantity;
wherein the feedforward signal comprises at least one of a target outlet water temperature, an inlet water flow rate and an inlet water temperature;
the post-feedback signal comprises the outlet water temperature;
the first state comprises at least one of a starting temperature rise stage, a single change of water quantity, a transition state for switching to a constant temperature control state and a switch sectional valve;
the second state comprises at least one of a constant temperature control state and a water quantity continuous fluctuation.
2. The method of temperature control according to claim 1, further comprising:
receiving a pre-feedback signal and a post-feedback signal;
and determining that the gas water heater is in the first state or the second state according to the front feedback signal and the rear feedback signal.
3. The temperature control method of claim 2, wherein determining a feedforward control amount to control the heating device based on the received feedforward signal comprises:
receiving inflow water flow, inflow water temperature and target outflow water temperature;
determining temperature regulating quantity according to the water inlet temperature and the target water outlet temperature;
and determining a feedforward control quantity for controlling the heating equipment according to the temperature regulating quantity and the inflow water flow.
4. The temperature control method of claim 3, wherein transmitting the pre-feedback signal and the post-feedback signal to an extended observer to determine a total disturbance quantity comprises:
transmitting the outlet water temperature, the inlet water flow and the inlet water temperature to an extended observer;
and determining the total disturbance quantity according to the disturbance quantity of the water outlet temperature, the disturbance quantity of the water inlet flow and the disturbance quantity of the water inlet temperature determined by the extended state observer.
5. The temperature control method according to claim 2, wherein the heating apparatus includes a proportional valve and a plurality of segment valves and fire bars connected in series to the proportional valve, the temperature control method further comprising:
converting the feedforward control quantity into a secondary pressure;
converting the secondary voltage to a pulse width modulated signal;
and controlling the opening of the proportional valve through the pulse width modulation signal.
6. The temperature control method according to claim 5, further comprising:
presetting a mapping relation between the pulse width modulation signal and a switch combination of the segment valve;
and matching the corresponding switch combination according to the pulse width modulation signal.
7. The method of claim 1, wherein the auto-disturbance rejection controller receives the total disturbance quantity, and the disturbance compensating the feedforward control quantity according to the total disturbance quantity comprises:
controlling an active disturbance rejection controller to receive the total disturbance quantity;
determining a feedforward proportion of the feedforward control quantity;
the active disturbance rejection controller converts the total disturbance quantity into a feedback control quantity;
the feedforward control amount is multiplied by the feedforward proportion and added to the feedback control amount to compensate for disturbance.
8. The temperature control method according to any one of claims 1 to 7, characterized in that the method further comprises:
in the first state, controlling the heating equipment to heat water by adopting the feedforward control quantity;
and in the second state, controlling the heating equipment to heat the water by adopting the feedforward control quantity after disturbance compensation.
9. A temperature control device for a gas water heater, comprising:
a heating device for heating water;
a feedforward controller for receiving a feedforward control quantity for controlling the heating apparatus determined from the feedforward signal;
the extended observer is used for receiving the front feedback signal and the rear feedback signal and calculating the total disturbance quantity through an active disturbance rejection control algorithm;
the active disturbance rejection controller is used for receiving the total disturbance quantity and carrying out disturbance compensation on the feedforward control quantity according to the total disturbance quantity;
a processor configured to:
under the condition that the water heater is in a first state, determining a feedforward control quantity for controlling the heating equipment according to the received feedforward signal;
under the condition that the water heater is in a second state, transmitting the pre-feedback signal and the post-feedback signal to an extended observer to determine a total disturbance quantity, controlling an active disturbance rejection controller to receive the total disturbance quantity, and performing disturbance compensation on the feedforward control quantity according to the total disturbance quantity; wherein the feedforward signal comprises a target temperature and at least one of inflow water flow and inflow water temperature before heating;
the post-feedback signal comprises the heated outlet water temperature;
the first state comprises at least one of a starting temperature rise stage, a single change of water quantity, a transition state for switching to a constant temperature control state and a switch sectional valve;
the second state comprises at least one of a constant temperature control state and continuous fluctuation of water amount.
10. The temperature control device of claim 9, wherein the processor is further configured to: and receiving a pre-feedback signal and a post-feedback signal, and determining that the water heater is in a first state or a second state according to the pre-feedback signal and the post-feedback signal.
11. The temperature control apparatus of claim 9, further comprising:
the flow sensor is used for detecting the inflow of water;
the first temperature sensor is used for detecting the temperature of the inlet water;
and the second temperature sensor is used for detecting the temperature of the outlet water.
12. The temperature control apparatus of claim 11, wherein the processor being configured to determine a feedforward control amount to control the heating device as a function of the received feedforward signal comprises the processor being configured to:
receiving inflow water flow, inflow water temperature and target temperature;
determining a regulation temperature according to the inlet water temperature and the target temperature;
and determining the feedforward control quantity for controlling the heating equipment according to the regulation temperature and the water inlet flow.
13. The temperature control apparatus according to claim 12,
the first input end of the extended observer is connected with the flow sensor and the first temperature sensor; the second input end is connected with the second temperature sensor and used for receiving the water inlet flow, the water inlet temperature and the water outlet temperature;
the processor being configured to determine a total disturbance quantity by transmitting the feedforward and postfeedback signals to a dilation observer comprises the processor being configured to:
transmitting the outlet water temperature, the inlet water flow and the inlet water temperature to an extended observer;
and controlling the extended state observer to determine the disturbance quantity of the water outlet temperature, the disturbance quantity of the water inlet flow and the disturbance quantity of the water inlet temperature to determine the total disturbance quantity.
14. The temperature control apparatus of claim 13, wherein the heating device comprises a proportional valve and a plurality of segment valves and fire bars connected in series by the proportional valve, the processor further configured to:
converting the feedforward control quantity into a secondary pressure;
converting the secondary voltage to a pulse width modulated signal;
and controlling the opening of the proportional valve through the pulse width modulation signal.
15. The temperature control device of claim 11, wherein the controlling auto-disturbance-rejection controller receives the total disturbance quantity and the disturbance compensating the feedforward control quantity according to the total disturbance quantity comprises:
controlling an active disturbance rejection controller to receive the total disturbance quantity;
determining a feedforward proportion of the feedforward control quantity;
converting the total disturbance quantity into a feedback control quantity through an active disturbance rejection controller;
and multiplying the feedforward proportion by the feedforward control quantity and accumulating the feedforward proportion and the feedback control quantity to perform disturbance compensation.
16. The temperature control device of any one of claims 11 to 15, wherein the processor is further configured to:
in the first state, controlling the heating equipment to heat water by adopting the feedforward control quantity;
and in the second state, controlling the heating equipment to heat the water by adopting the feedforward control quantity after disturbance compensation.
17. A gas water heater comprising a gas water heater body and further comprising a temperature control device according to any one of claims 11 to 16.
18. A machine-readable storage medium, characterized in that it has stored thereon instructions for enabling a processor, when executed by said processor, to carry out a temperature control method for a gas water heater according to any one of claims 1 to 8.
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| CN114234452A (en) * | 2021-12-28 | 2022-03-25 | 中国石油大学(华东) | Constant temperature control method of gas water heater based on feedforward fuzzy active disturbance rejection |
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| CN105423334B (en) * | 2015-12-31 | 2017-11-21 | 中冶南方工程技术有限公司 | Combustion of Hot Air Furnace Intelligent Process Control system and method |
| CN105571142B (en) * | 2016-01-04 | 2020-08-25 | 湖南工业大学 | Constant temperature gas water heater with remote temperature regulation and cold water heat compensation control |
| CN105444425B (en) * | 2016-01-04 | 2019-12-06 | 湖南工业大学 | constant temperature gas water heater with remote temperature regulation and cold water temperature compensation control |
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