Temperature control method and temperature control device
View Patent ↗Disclosed is a temperature control method which includes acquiring temperature data of a plurality of temperature detection points in a target environment; calculating, according to the temperature data, an average temperature value of the plurality of temperature detection points and a first temperature difference between the average temperature value and a target temperature value; determining whether an absolute value of the first temperature difference exceeds a first temperature difference threshold; and in response to the absolute value of the first temperature difference exceeding the first temperature difference threshold, controlling the temperature of the target environment by a variable universe fuzzy proportional integral derivative control algorithm.
1. A temperature control method, comprising:
acquiring temperature data of a plurality of temperature detection points in a target environment;
calculating, according to the temperature data, an average temperature value of the plurality of temperature detection points and a first temperature difference between the average temperature value and a target temperature value;
determining whether an absolute value of the first temperature difference exceeds a first temperature difference threshold;
in response to the absolute value of the first temperature difference exceeding the first temperature difference threshold, controlling the temperature of the target environment by a variable universe fuzzy PID control algorithm;
calculating a second temperature difference between any two adjacent temperature detection points in the plurality of temperature detection points according to the temperature data;
determining whether an absolute value of the second temperature difference exceeds a second temperature difference threshold; and
in response to the absolute value of the second temperature difference exceeding the second temperature difference threshold, adjusting airflow of the target environment,
wherein the controlling the temperature of the target environment by a variable universe fuzzy PID control algorithm comprises:
calculating a first temperature difference change rate by a differential method;
determining an adjustment variable by means of a variable universe fuzzy control algorithm according to the first temperature difference and the first temperature difference change rate;
determining a real-time control parameter by means of a PID control algorithm according to the first temperature difference and the adjustment variable; and
generating a control signal according to the real-time control parameter to control the temperature of the target environment.
2. The temperature control method according to claim 1 , wherein the determining an adjustment variable by means of a variable universe fuzzy control algorithm according to the first temperature difference and the first temperature difference change rate comprises:
determining an input universe scaling factor and an output universe scaling factor according to the first temperature difference and the first temperature difference change rate;
fuzzifying the first temperature difference and the first temperature difference change rate to obtain a fuzzified input;
performing fuzzy reasoning according to a fuzzy control rule to convert the fuzzified input into a fuzzified output; and
defuzzifying the fuzzified output to obtain the adjustment variable.
3. The temperature control method according to claim 2 , wherein the input universe scaling factor is determined by the following piecewise proportional function:
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wherein e and ec represent the first temperature difference and the first temperature difference change rate respectively, which have basic universes of X e =[−x emax ,x emax ] and X ec =[−x ecmax ,x ecmax ], respectively, and
wherein θ i , is a piecewise threshold, parameters λ i and ε i are sensitivity adjustment parameters, wherein i=1,2.
4. The temperature control method according to claim 2 , wherein the output universe scaling factor is determined by the following formula:
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wherein e and ec respectively represent the first temperature difference and the first temperature difference change rate, which have basic universes of X e =[−x emax ,x emax ] and X ec =[−x ecmax ,x ecmax ], respectively.
5. The temperature control method according to claim 2 , wherein the performing fuzzy reasoning according to a fuzzy control rule to convert the fuzzified input into a fuzzified output comprises performing the fuzzy reasoning by means of Mamdani algorithm.
6. The temperature control method according to claim 2 , wherein the defuzzifying the fuzzified output to obtain the adjustment variable comprises: defuzzifying the fuzzified output by means of a centroid method.
7. The temperature control method according to claim 1 , wherein the determining a real-time control parameter by means of a PID control algorithm according to the first temperature difference and the adjustment variable comprises:
performing parameter tuning according to the first temperature difference by means of the PID control algorithm to obtain an initial control parameter; and
determining the real-time control parameter by accumulating the initial control parameter and the adjustment variable.
8. The temperature control method according to claim 1 , further comprising:
before calculating, according to the temperature data, an average temperature value of the plurality of temperature detection points and a difference between the average temperature value and a target temperature value, receiving a setting of the target temperature value.
9. A temperature control device comprising:
a data acquisition module configured to acquire temperature data of a plurality of temperature detection points in a target environment;
a data processing module configured to calculate, according to the temperature data, an average temperature value of the plurality of temperature detection points and a first temperature difference between the average temperature value and a target temperature value;
a determination module configured to determine whether an absolute value of the first temperature difference exceeds a first temperature difference threshold; and
a first temperature control module configured to, in response to the absolute value of the first temperature difference exceeding the first temperature difference threshold, control the temperature of the target environment by a variable universe fuzzy PID control algorithm;
a second temperature control module configured to: calculate, according to the temperature data, a second temperature difference between any two adjacent temperature detection points in the plurality of temperature detection points; determine whether an absolute value of the second temperature difference exceeds a second temperature difference threshold; and in response to the absolute value of the second temperature difference exceeding the second temperature difference threshold, adjust airflow of the target environmentcal,
wherein the first temperature control module comprises:
a differentiator configured to calculate a first temperature difference change rate by a differential method according to the first temperature difference;
a fuzzy controller configured to determine an adjustment variable by means of a variable universe fuzzy control algorithm according to the first temperature difference and the first temperature difference change rate; and
a PID controller configured to determine a real-time control parameter by means of a PID control algorithm according to the first temperature difference and the adjustment variable and thereby to generate a control signal for controlling the temperature of the target environment.
10. The temperature control device according to claim 9 , further comprising an execution mechanism configured to adjust the temperature of the target environment, and
the first temperature control module is further configured to control the temperature of the target environment by a variable universe fuzzy PID control algorithm by means of the execution mechanism.
11. The temperature control device according to claim 10 , wherein the execution mechanism comprises a heating system and a refrigeration system.
12. The temperature control device according to claim 9 , further comprising:
a target temperature setting module configured to receive a setting of the target temperature value; and
a display module configured to display at least one of the temperature data and the average temperature value.
13. A computer-readable storage medium having stored thereon computer-readable instructions that, when executed, perform the method according to claim 1 .