CN113867440A - Heating temperature control method based on pid algorithm - Google Patents
Heating temperature control method based on pid algorithm Download PDFInfo
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- CN113867440A CN113867440A CN202111176745.XA CN202111176745A CN113867440A CN 113867440 A CN113867440 A CN 113867440A CN 202111176745 A CN202111176745 A CN 202111176745A CN 113867440 A CN113867440 A CN 113867440A
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
The invention relates to the technical field of temperature control, and provides a pid algorithm-based heating temperature control method for facilitating heating temperature control, which comprises the following steps: step S1, determining the relation f (t) between the water inlet temperature and the coefficient Kp; step S2, determining the relation Z (lp) between the water inlet flow rate and the coefficient Kp and the relation T (Li) between the water inlet flow rate and the coefficient Ti; step S3, detecting the actual water inlet temperature and the actual water inlet flow when heating starts; step S4, determining an actual coefficient Kp according to the actual water inlet temperature, f (t), Z (lp), and determining an actual coefficient Ti according to the actual water inlet flow and T (Li); and step S5, transmitting the actual coefficient Kp and the actual coefficient Ti into the pid heating control algorithm module for heating control. By adopting the mode, the situation that the temperature exceeds the safety range can be effectively avoided.
Description
Technical Field
The invention relates to the technical field of temperature control, in particular to a pid algorithm-based heating temperature control method.
Background
Along with the improvement of living standard, the intelligent closestool lid has walked into millions of families, wherein instant heating type closestool receives market favor because it can avoid the bacterium to breed in the water storage tank, but because the nature of instant heating type self flowing water heating and the requirement of national standard need reach higher temperature in a few seconds of water, consequently the heater just needs to export higher power at the initial stage of heating, and in addition china's width has great difference in different regional quality of water, temperature, voltage etc. lead to leaving water temperature to surpass the safe range of regulation easily, can also cause personnel's injury in the serious time.
Disclosure of Invention
In order to facilitate the control of the heating temperature, the invention provides a heating temperature control method based on a pid algorithm.
The technical scheme adopted by the invention for solving the problems is as follows:
the heating temperature control method based on the pid algorithm comprises the following steps:
step S1, determining the relation f (t) between the water inlet temperature and the coefficient Kp;
step S2, determining the relation Z (lp) between the water inlet flow rate and the coefficient Kp and the relation T (Li) between the water inlet flow rate and the coefficient Ti;
step S3, detecting the actual water inlet temperature and the actual water inlet flow when heating starts;
step S4, determining an actual coefficient Kp according to the actual water inlet temperature, f (t), Z (lp), and determining an actual coefficient Ti according to the actual water inlet flow and T (Li);
and step S5, transmitting the actual coefficient Kp and the actual coefficient Ti into the pid heating control algorithm module for heating control.
Further, the step S1 includes:
step S11, fixing the water inlet flow as F1, and manually calling a group of parameters M under the condition of low water inlet temperature1；
Step S12, adopting the same water inlet flow rate to manually adjust another group of parameters M under the condition of high water inlet temperature2；
Step S13, according to the low water inlet temperature, M1High water entry temperature and M2And acquiring the relation f (t) between the inlet water temperature and the coefficient Kp.
Further, the low inlet water temperature is in a range of 2-6 ℃, and the high inlet water temperature is in a range of 27-30 ℃.
Further, the low water inlet temperature is 5 ℃ and the high water inlet temperature is 30 ℃.
Further, z (lp) and t (li) are piecewise functions.
Further, the step S2 includes:
step S21, fixing the temperature of the inlet water, and manually adjusting a group of parameters M at a flow rate of F1+ X3；
Step S22, manually calling another group of parameters M at the flow rate of F1-Y under the same water inlet temperature4；
Step S23, according to F1 and M1F1+ X and M3Obtaining a relation Z between the inflow rate and a coefficient Kp1(Lp) and the relationship T between the inflow and the coefficient Ti1(Li)；
Step S24, according to F1 and M1F1-Y and M4Obtaining a relation Z between the inflow rate and a coefficient Kp2(Lp) and the relationship T between the inflow and the coefficient Ti2(Li)。
Further, the step S4 includes:
step S41, acquiring a Kp value according to the actual water inlet temperature and f (t);
step S42, obtaining an actual coefficient Kp based on the detected water inlet flow rate and Z (lp);
and step S43, acquiring an actual coefficient Ti according to the actual water inlet flow and T (Li).
Compared with the prior art, the invention has the beneficial effects that: by determining the coefficients Kp and Ti in the pid algorithm, the pid heating control algorithm module is more consistent with the use environment of the intelligent closestool during heating control, and the situation that the water temperature exceeds the safety range is effectively avoided.
Drawings
FIG. 1 is a flow chart of a pid algorithm-based heating temperature control method of the present invention;
FIG. 2 is a graph showing the effect of temperature control on 220v voltage level 2 flow rate of 35 DEG water;
FIG. 3 is a graph showing the effect of temperature control on the 253v voltage level-2 flow rate of 35 ℃ inlet water;
FIG. 4 is a graph showing the effect of temperature control on 220v voltage 4-level flow rate of 35-degree inlet water;
fig. 5 is a temperature control effect graph of 35-degree water inlet 253v, voltage and flow rate of 4 levels.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the method for controlling heating temperature based on pid algorithm includes:
step S1, determining the relation f (t) between the water inlet temperature and the coefficient Kp;
step S2, determining the relation Z (lp) between the water inlet flow rate and the coefficient Kp and the relation T (Li) between the water inlet flow rate and the coefficient Ti;
step S3, detecting the actual water inlet temperature and the actual water inlet flow when heating starts;
step S4, determining an actual coefficient Kp according to the actual water inlet temperature, f (t), Z (lp), and determining an actual coefficient Ti according to the actual water inlet flow and T (Li);
and step S5, transmitting the actual coefficient Kp and the actual coefficient Ti into the pid heating control algorithm module for heating control.
Specifically, the step S1 includes:
step S11, fixing the water inlet flow as F1, and manually calling a group of parameters M under the condition of low water inlet temperature1The parameter M comprises a Kp value and a Ti value;
step S12, adopting the same water inlet flow rate to manually adjust another group of parameters M under the condition of high water inlet temperature2；
Step S13, according to the low water inlet temperature, M1High water entry temperature and M2And acquiring the relation f (t) between the inlet water temperature and the coefficient Kp. According to the experiment of the inventor, the relation between the coefficient Kp and the temperature can be approximately regarded as a linear relation, so that no additional processing is needed.
Further, the low water inlet temperature and the high water inlet temperature need to cover the temperature range of the product as much as possible, for example, the low water inlet temperature is 2-6 ℃, the high water inlet temperature is 27-30 ℃, specifically, the low water inlet temperature is 5 ℃, and the high water inlet temperature is 30 ℃. In the actual use process, if the actual temperature is lower than the low water inlet temperature, the water is treated according to the low water inlet temperature, and if the actual temperature is higher than the high water inlet temperature, the water is treated according to the high water inlet temperature.
In order to obtain a more accurate value, in this embodiment, both z (lp) and t (li) adopt a piecewise function, and for convenience of calculation, the piecewise function is divided into two segments, or multiple segments according to actual needs.
Specifically, the step S2 includes:
step S21, fixing the temperature of the inlet water, and manually adjusting a group of parameters M at a flow rate of F1+ X3；
Step S22, manually calling another group of parameters M at the flow rate of F1-Y under the same water inlet temperature4(ii) a Wherein the values of X and Y can be equal or unequal, but the flow rate is not more than 800ml at most and not less than 400ml at least when the flow rate is selected.
Step S23, according to F1 and M1F1+ X and M3Obtaining a relation Z between the inflow rate and a coefficient Kp1(Lp) and the relationship T between the inflow and the coefficient Ti1(Li)；
Step S24, according to F1 and M1F1-Y and M4Obtaining a relation Z between the inflow rate and a coefficient Kp2(Lp) and the relationship T between the inflow and the coefficient Ti2(Li)。
The step S4 includes:
step S41, acquiring a Kp value according to the actual water inlet temperature and f (t);
step S42, obtaining an actual coefficient Kp based on the detected water inlet flow rate and Z (lp); specifically, the actual flow rate is used to scale the Kp value obtained in step S41 by the relationship Z (lp) to obtain the actual coefficient Kp, and specifically, which piecewise function is selected to be used is determined by the actual flow rate, that is, the actual flow rate is determined by using Z1(Lp) or Z2(Lp)；
And step S43, acquiring an actual coefficient Ti according to the actual water inlet flow and T (Li).
The correlation coefficient of the pid algorithm is dynamically obtained through the actual water inlet flow and the water inlet temperature, so that the temperature control is more in accordance with the safety requirement, fig. 2-5 are temperature control effect graphs of different voltages and flows when the water inlet temperature is 35 ℃, wherein 39 ℃ is a set safety temperature value, and as can be seen from the graphs, the temperature can be controlled below the safety temperature value after about 12S.
Claims (7)
1. The method for controlling the heating temperature based on the pid algorithm is characterized by comprising the following steps:
step S1, determining the relation f (t) between the water inlet temperature and the coefficient Kp;
step S2, determining the relation Z (lp) between the water inlet flow rate and the coefficient Kp and the relation T (Li) between the water inlet flow rate and the coefficient Ti;
step S3, detecting the actual water inlet temperature and the actual water inlet flow when heating starts;
step S4, determining an actual coefficient Kp according to the actual water inlet temperature, f (t), Z (lp), and determining an actual coefficient Ti according to the actual water inlet flow and T (Li);
and step S5, transmitting the actual coefficient Kp and the actual coefficient Ti into the pid heating control algorithm module for heating control.
2. The pid algorithm-based heating temperature control method according to claim 1, wherein the step S1 includes:
step S11, fixing the water inlet flow as F1, and manually calling a group of parameters M under the condition of low water inlet temperature1；
Step S12, adopting the same water inlet flow rate to manually adjust another group of parameters M under the condition of high water inlet temperature2；
Step S13, according to the low water inlet temperature, M1High water entry temperature and M2And acquiring the relation f (t) between the inlet water temperature and the coefficient Kp.
3. The pid algorithm-based heating temperature control method according to claim 2, wherein the low inlet water temperature is in a range of 2 to 6 ℃ and the high inlet water temperature is in a range of 27 to 30 ℃.
4. The pid algorithm-based heating temperature control method according to claim 3, wherein the low inlet water temperature is 5 ℃ and the high inlet water temperature is 30 ℃.
5. The pid algorithm-based heating temperature control method of claim 2, wherein z (lp) and t (li) are both piecewise functions.
6. The pid algorithm-based heating temperature control method according to claim 5, wherein the step S2 includes:
step S21, fixing the temperature of the inlet water, and manually adjusting a group of parameters M at a flow rate of F1+ X3；
Step S22, manually calling another group of parameters M at the flow rate of F1-Y under the same water inlet temperature4；
Step S23, according to F1 and M1F1+ X and M3Obtaining a relation Z between the inflow rate and a coefficient Kp1(Lp) and the relationship T between the inflow and the coefficient Ti1(Li)；
Step S24, according to F1 and M1F1-Y and M4Obtaining a relation Z between the inflow rate and a coefficient Kp2(Lp) and the relationship T between the inflow and the coefficient Ti2(Li)。
7. The pid algorithm-based heating temperature control method according to claim 6, wherein the step S4 includes:
step S41, acquiring a Kp value according to the actual water inlet temperature and f (t);
step S42, obtaining an actual coefficient Kp based on the detected water inlet flow rate and Z (lp);
and step S43, acquiring an actual coefficient Ti according to the actual water inlet flow and T (Li).
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4769151A (en) * | 1986-10-30 | 1988-09-06 | Cobe Laboratories, Inc. | Heater control for liquid flowing through a chamber |
| JPH05272804A (en) * | 1992-03-25 | 1993-10-22 | Toto Ltd | Heating controller for hot water feeder and the like |
| JPH06117631A (en) * | 1992-10-05 | 1994-04-28 | Gastar Corp | Combustion control method for hot water supply heater |
| US20150206776A1 (en) * | 2012-07-25 | 2015-07-23 | Kelk Ltd. | Temperature Controller for Semiconductor Manufacturing Equipment, Method for Calculating PID Constants in Semiconductor Manfacturing, and Method for Operating Temperature Controller for Semiconductor Manufacturing Equipment |
| CN112682946A (en) * | 2020-12-28 | 2021-04-20 | 威能(无锡)供热设备有限公司 | Gas water heating equipment and start control method and readable storage medium thereof |
| CN112682947A (en) * | 2020-12-28 | 2021-04-20 | 威能(无锡)供热设备有限公司 | Gas water heating equipment and disturbance compensation control method and readable storage medium thereof |
-
2021
- 2021-10-09 CN CN202111176745.XA patent/CN113867440A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4769151A (en) * | 1986-10-30 | 1988-09-06 | Cobe Laboratories, Inc. | Heater control for liquid flowing through a chamber |
| JPH05272804A (en) * | 1992-03-25 | 1993-10-22 | Toto Ltd | Heating controller for hot water feeder and the like |
| JPH06117631A (en) * | 1992-10-05 | 1994-04-28 | Gastar Corp | Combustion control method for hot water supply heater |
| US20150206776A1 (en) * | 2012-07-25 | 2015-07-23 | Kelk Ltd. | Temperature Controller for Semiconductor Manufacturing Equipment, Method for Calculating PID Constants in Semiconductor Manfacturing, and Method for Operating Temperature Controller for Semiconductor Manufacturing Equipment |
| CN112682946A (en) * | 2020-12-28 | 2021-04-20 | 威能(无锡)供热设备有限公司 | Gas water heating equipment and start control method and readable storage medium thereof |
| CN112682947A (en) * | 2020-12-28 | 2021-04-20 | 威能(无锡)供热设备有限公司 | Gas water heating equipment and disturbance compensation control method and readable storage medium thereof |
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