CN115167114A - Constant temperature control method and system for electric heating sheet - Google Patents
Constant temperature control method and system for electric heating sheet Download PDFInfo
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Abstract
The invention provides a constant temperature control method and system for an electric heating piece, and relates to the technical field of constant temperature control of electric heating pieces. In the embodiment of the invention, the operation parameters of the electric heating piece hardware module are initialized; wherein the operating parameters include: a proportional control coefficient, an integral control coefficient, and a derivative control coefficient; calculating a deviation parameter between the set temperature and the current temperature according to the operation parameter; wherein the deviation parameters include: historical deviation sum, current deviation sum difference; calculating PI D output gain according to the deviation parameter; and controlling the temperature of the heating sheet to be in a constant state according to the corresponding relation between the PID output gain and the PWM pulse width output of the electric heating sheet.
Description
Technical Field
The invention relates to the technical field of electric heating sheets, in particular to a constant temperature control method and system for an electric heating sheet.
Background
With the rapid development of socioeconomic performance, there is a need for monitoring and controlling the temperature in various furnaces, reactors, and boilers. The singlechip is adopted to control the temperature controller, so that the temperature controller not only has the advantages of convenience, simplicity, high flexibility and the like, but also can greatly improve the technical index of controlled temperature, thereby effectively improving the quality of products.
In the current society, popular consumers prefer small-sized and portable electronic products. As a new electric heating product, compared with the traditional metal electric heating product, the electric heating piece can be more tightly attached to the surface of a heated object during heating, and the volume of the product is effectively saved. At present, the electric heating sheet is widely applied to various industries such as handheld outdoor heat insulation products, outdoor heat insulation and freeze prevention, chemical equipment temperature rise, pipeline freeze prevention, medical treatment and the like, and the electric heating sheet on the market generally has the defects of slow heating, fast heat dissipation, inaccurate temperature and the like.
Disclosure of Invention
The invention provides a constant temperature control method and a constant temperature control system for an electric heating piece, which are used for solving the problems of low heating speed, high heat dissipation speed, inaccurate temperature and the like of the electric heating piece in the market.
A constant temperature control method for an electric heating piece comprises the following steps:
initializing the operation parameters of the electric heating piece hardware module; wherein,
the operating parameters include: a proportional control coefficient, an integral control coefficient, and a derivative control coefficient;
calculating a deviation parameter between the set temperature and the current temperature according to the operation parameter; wherein,
the deviation parameters include: a difference between a historical deviation sum, a current deviation sum;
calculating PID output gain according to the deviation parameter;
and controlling the temperature of the heating sheet to be in a constant state according to the corresponding relation between the PID output gain and the PWM pulse width output of the electric heating sheet.
And further: the hardware module comprises: the device comprises a power management chip, a temperature sensor, a temperature acquisition timer, a PID control timer, a battery and a PWM timer; wherein,
the power management chip is respectively and electrically connected with the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer;
the power management chip is used for controlling the charging and discharging of the battery of the electric heating piece;
the temperature sensor is used for sensing the temperature of the electric heating piece and generating a temperature sensing signal;
the temperature acquisition timer is used for regularly managing a temperature acquisition process according to a control instruction of the power management chip;
the PID control timer is used for controlling the constant temperature of the electric heating piece;
the PWM timer is used for sending out a PWM pulse width signal and adjusting the power of the electric heating piece;
the battery is used for providing electric energy.
Further: the setting parameters comprise automatic setting parameters and user setting parameters: wherein,
the automatic parameter setting comprises the following steps:
receiving an electric heating piece starting instruction input by a user through the power management chip, and heating a heated object;
setting a first operation period, and carrying out temperature detection based on a temperature sensor at preset time intervals in the first operation period to obtain a plurality of temperature values;
accumulating the temperature values according to a preset period to obtain an accumulated value, and calculating according to the accumulated value to obtain an average induction value;
taking the average induction value as a reference threshold value of each temperature detection in the next period;
and taking the reference threshold value as an automatic setting parameter.
And further: the initialization comprises the following steps:
respectively detecting the in-place states of the power management chip, the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer;
receiving real-time state signals of the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer through the power management chip according to the in-place state;
judging whether a fluctuation parameter exists or not according to the real-time state signal; wherein,
when the fluctuation data exists, the power management chip, the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer are reset integrally and restarted;
and when the fluctuation data does not exist, judging whether the real-time state signal exceeds a preset reference parameter, and when the real-time state signal does not exceed the preset reference parameter, determining an initial data value corresponding to the implementation state signal, and taking the initial data value as an initialization value.
And further: the calculating of the deviation parameter between the set temperature and the current temperature according to the operation parameter includes:
calculating the deviation between the set temperature and the current temperature, and determining the current deviation;
calculating the current deviation for multiple times in the same time interval, and determining the deviation sum calculated for multiple times as a historical deviation sum; wherein,
the historical deviation is shown as follows:
SEk＝Ek+Ek-1+Ek-2+...+E1；
determining two nearest deviations, calculating a proximity deviation, and taking the proximity deviation as a difference of the deviations; wherein,
the difference between the deviations is shown as follows:
ΔEk＝Ek-Ek-1。
and further: and calculating PID output gain according to the deviation parameter, wherein the PID output gain is represented by the following formula:
wherein Kp represents a proportional control coefficient; ki represents an integral control coefficient; kd denotes a differential control coefficient; ek represents the difference between the set temperature and the current temperature; ek-1 represents the difference between the last set temperature and the current temperature; pout0 represents a constant to prevent the system from running away when Ek = 0.
And further: the method further comprises the following steps:
step 1: presetting at least two constant monitoring periods, and determining a temperature recording list of each period;
sequencing a plurality of temperature monitoring data in the temperature recording list through time points to generate a temperature sequence, wherein a unique identification column where each temperature data of the temperature sequence is located stores a corresponding time stamp;
step 2: fitting and calculating the temperature sequences of different monitoring periods to determine a fitting value;
according to the fitting value, judging the constant temperature difference rate of different monitoring periods;
and judging whether to regulate and control the constant state again according to the constant temperature difference rate.
And further: the power of adjusting the electric heating piece comprises:
detecting the current operating voltage and current of the electric heating piece, and calculating the latest current output power according to the operating voltage and current;
determining a constant temperature according to the PID control timer, and judging the required power of the electric heating piece based on the constant temperature;
calculating a power change difference between the current output power and the required power;
if the power change difference value is within a preset setting range, calculating the product of the power change difference value and a power change scale factor to obtain a disturbance step length; wherein,
calculating a disturbance step length by using a variable step length disturbance observation algorithm, and initializing and setting a power change scaling factor when the variable step length disturbance observation algorithm is started to be executed;
determining a power correction parameter according to the change scale factor and the current output power;
and adjusting power through the power management chip according to the power correction parameter.
Further: the method further comprises the following steps:
acquiring battery operation parameters;
according to the battery operation parameters, calculating the SOC value of the residual electric quantity of the battery through the power management chip;
determining an energy supply state according to the corresponding relation among the residual battery capacity, the battery operation parameters and the energy supply state;
determining a current output strategy according to the corresponding relation between the energy supply state and the constant temperature control;
determining the remaining time of constant temperature control according to the corresponding relation among the remaining battery capacity, the battery operation parameters and the current output strategy;
and when the remaining time is lower than a preset threshold value, performing low-power alarm.
Further: the method further comprises the following steps:
detecting whether constant temperature control is triggered;
detecting the output voltage of the battery after detecting the triggering of the constant temperature control;
and when the detection value of the output voltage is a positive pressure value, judging that the state of the battery is a discharge state, and starting the low-power alarm according to the discharge state.
An electric heating plate constant temperature control system, comprising:
an initialization module: the operation parameters are used for initializing the electric heating piece hardware module; wherein,
the operating parameters include: a proportional control coefficient, an integral control coefficient, and a derivative control coefficient;
a deviation calculation module: the deviation parameter is used for calculating the set temperature and the current temperature according to the operation parameter; wherein,
the deviation parameters include: historical deviation sum, current deviation sum difference;
a PID gain calculation module: the PID gain control module is used for calculating PID output gain according to the deviation parameter;
a constant temperature control module: and the controller is used for controlling the temperature of the heating plate to be in a constant state according to the corresponding relation between the PID output gain and the PWM pulse width output of the electric heating plate.
The invention has the beneficial effects that: the invention relates to a constant temperature control method and a constant temperature control system for an electric heating sheet. The electric heating piece heating device is adopted, so that the electric heating piece heating device can be tightly attached to the surface of a heated object, and the volume of a product is effectively reduced; the thermostatic control is realized by adopting a software PID control algorithm, and the additional hardware cost is not required to be increased; the temperature control system is stable and rapid, has high reliability, and effectively solves the defects of slow heating and rapid heat dissipation; when the electric heating piece heats, have that temperature control precision is high, fluctuation range is little, can carry out real-time supervision's advantage to the temperature, improved user's experience and safety in utilization.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding 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 principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 is a flowchart of a method for controlling a constant temperature of an electric heating plate according to an embodiment of the present invention;
FIG. 2 is a PID algorithm control function block diagram in an embodiment of the invention;
FIG. 3 is a flow chart of the implementation of the PID algorithm in an embodiment of the invention;
FIG. 4 is a schematic diagram of a constant temperature control circuit of the electric heating plate in the embodiment of the present invention.
FIG. 5 is a diagram of part 4-A of the thermostatic control circuit principle of the electric heating plate in the embodiment of the present invention;
FIG. 6 is a diagram of part 4-B of the circuit principle of the thermostatic control of the electric heating sheet in the embodiment of the invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in the attached figure 1, the constant temperature control method for the electric heating sheet comprises the following steps:
initializing the operation parameters of the electric heating piece hardware module; wherein,
the operating parameters include: a proportional control coefficient, an integral control coefficient, and a derivative control coefficient;
calculating a deviation parameter between the set temperature and the current temperature according to the operation parameter; wherein,
the deviation parameters include: a difference between a historical deviation sum, a current deviation sum;
calculating PID output gain according to the deviation parameter;
and controlling the temperature of the heating sheet to be in a constant state according to the corresponding relation between the PID output gain and the PWM pulse width output of the electric heating sheet.
The principle of the technical scheme is as follows: as shown in the attached figure 1, the current temperature can be judged through the operation parameters of the hardware of the electric heating sheet, and then the constant temperature adjustment is carried out according to the difference value between the current temperature and the set temperature.
According to the invention, the battery voltage is boosted to a fixed 5V output by using the DC-DC chip, and compared with the direct output of the battery in the conventional scheme, the output power of the electric heating sheet does not change along with the change of the battery voltage, so that the whole control system tends to be more stable and has small fluctuation amplitude; the method comprises the steps that a 12-Bit high-precision ADC module is integrated in an MCU (micro control unit) to sample NTC (negative temperature coefficient) temperature, and a software filtering algorithm is adopted, so that the control precision and reliability of a constant temperature system are improved, the temperature of an electric heating piece is monitored in real time, a safe temperature threshold value is set, if the temperature reaches the safe temperature alarm threshold value, the electric heating piece is controlled to be turned off for heating, and the safety and stability of a product are improved; based on the PID control algorithm, the MCU can quickly calculate the PWM output value and acts on the electric heating sheet to realize quick response to the set temperature.
The beneficial effects of the above technical scheme are that: the invention relates to a constant temperature control method and a system of an electric heating piece, which comprises that the control method and the control system adopt an electric heating piece heating device, can be tightly attached to the surface of a heated object, and effectively reduce the volume of a product; the thermostatic control is realized by adopting a software PID control algorithm, and the hardware cost is not required to be additionally increased; the temperature control system is stable and rapid, has high reliability, and effectively solves the defects of slow heating and rapid heat dissipation; when the electric heating piece heats, have that temperature control precision is high, fluctuation range is little, can carry out real-time supervision's advantage to the temperature, improved user's experience and safety in utilization.
And further: the hardware module comprises: the device comprises a power management chip, a temperature sensor, a temperature acquisition timer, a PID control timer, a battery and a PWM timer; wherein,
the power management chip is respectively and electrically connected with the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer;
the power management chip is used for controlling the charging and discharging of the battery of the electric heating piece;
the temperature sensor is used for sensing the temperature of the electric heating piece and generating a temperature sensing signal;
the temperature acquisition timer is used for regularly managing a temperature acquisition process according to a control instruction of the power management chip;
the PID control timer is used for controlling the constant temperature of the electric heating piece;
the PWM timer is used for sending out a PWM pulse width signal and adjusting the power of the electric heating piece;
the battery is used for providing electric energy.
The principle of the technical scheme is as follows: as shown in fig. 4, 5 and 6, the hardware model of the invention comprises a power management chip U2, a temperature sensor RT1, a temperature acquisition timer J1, a PID control timer Q1, a battery and a PWM timer, and the components perform charging and discharging and temperature sensing, thereby realizing PID control and constant temperature. The PWM timer is built in the power management chip. The battery is a built-in battery which is connected through VOUT and VDD ports.
The beneficial effects of the above technical scheme are that: the hardware equipment can perform timing control, obtain the operation parameters according to time, and obtain more accurate parameters.
And further: the setting parameters comprise automatic setting parameters and user setting parameters: wherein,
the automatic parameter setting comprises the following steps:
receiving an electric heating piece starting instruction input by a user through the power management chip, and heating a heated object; optionally, an electric heating sheet starting instruction of a user is received through the U2, and then the object to be heated is heated through the electric heating sheet.
Setting a first operation period, and detecting the temperature based on a temperature sensor at preset time intervals in the first operation period to obtain a plurality of temperature values; optionally, in the present invention, during the operation period, the temperature detection is performed at intervals, and a plurality of temperature values are generated.
Accumulating the temperature values according to a preset period to obtain an accumulated value, and calculating according to the accumulated value to obtain an average induction value; optionally, the present invention calculates an average value of the temperature in a period, so as to realize average value sensing of the temperature, and the average temperature value is used as a reference threshold value, so as to realize automatic parameter setting.
Taking the average induction value as a reference threshold value of each temperature detection in the next period;
and taking the reference threshold value as an automatic setting parameter.
The principle of the technical scheme is as follows: when the parameters are automatically set, the average temperature is automatically calculated according to the preset running period in the starting state, and the average temperature is used as the reference threshold value which is automatically set.
The beneficial effects of the above technical scheme are that: automatic temperature regulation and control can be achieved without setting the temperature by the user.
Further: the initialization comprises the following steps:
respectively detecting the in-place states of the power management chip, the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer;
optionally, the real-time states of the power management chip, the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer are judged, and whether the electronic device of the electric heating sheet is normally operated or not is judged.
Receiving real-time state signals of the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer through the power management chip according to the in-place state;
when all the electronic devices are determined to be in normal operation, a real-time status signal of each electronic device is received through the power management chip area, and the signal is an operation signal of each electronic device, namely a current and voltage signal.
Judging whether a fluctuation parameter exists or not according to the real-time state signal; wherein,
when the fluctuation data exists, the power management chip, the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer are reset integrally and restarted;
and when the fluctuation data does not exist, judging whether the real-time state signal exceeds a preset reference parameter, and when the real-time state signal does not exceed the reference parameter, determining an initial data value corresponding to the implementation state signal, and taking the initial data value as an initialization value.
Whether fluctuation parameters exist or not is judged, the fluctuation parameters are determined based on the reference threshold value, therefore, rapid fluctuation judgment can be achieved, the purpose of initialization is to judge the fluctuation standard of each electronic device more easily, and after the electric heating sheet is started, whether operation fluctuation of the electronic device occurs or not can be detected more accurately.
The principle of the technical scheme is as follows: the invention can initialize the hardware equipment and initialize the state of the hardware equipment, and in the initialization process, if the real-time state of the hardware equipment is unchanged, the unchanged real-time parameters can be used as initialization parameters to set the initial standard.
The beneficial effects of the above technical scheme are that: more accurate thermostatic control can be achieved under initialization.
Further: the calculating of the deviation parameter between the set temperature and the current temperature according to the operation parameter includes:
calculating the deviation between the set temperature and the current temperature, and determining the current deviation;
calculating the current deviation for multiple times in the same time interval, and determining the deviation sum calculated for multiple times as a historical deviation sum; wherein,
the historical deviation is shown as follows:
SEk＝Ek+Ek-1+Ek-2+...+E1；
determining two nearest deviations, calculating a proximity deviation, and taking the proximity deviation as a deviation difference; wherein,
the difference between the deviations is shown as follows:
ΔEk＝Ek-Ek-1。
the principle of the technical scheme is as follows: as shown in fig. 2 and 3, the deviation of the temperature can be determined by calculating the deviation, thereby realizing gain calculation of PID control, by which gain calculation it is possible to
The beneficial effects of the above technical scheme are that: from the deviation data, the gain of the PID control is calculated.
And further: and calculating PID output gain according to the deviation parameter, wherein the PID output gain is represented by the following formula:
wherein, K p A proportional control coefficient; k i Represents an integral control coefficient; k d Represents a differential control coefficient; e k Indicating the difference between the set temperature and the current temperature; e k-1 Representing the difference between the last set temperature and the current temperature; p is out0 A constant is shown to prevent the system from running away when Ek = 0.
The principle of the technical scheme is as follows: the power control of the electric heating piece is realized by calculating the output PWM pulse width Pout through a software PID control algorithm, so that the temperature can be kept constant at a set value.
The beneficial effects of the above technical scheme are that: the temperature is controlled to be constant, and the temperature is prevented from being out of control.
Further: the method further comprises the following steps:
step 1: presetting at least two constant monitoring periods, and determining a temperature recording list of each period;
sequencing a plurality of temperature monitoring data in the temperature recording list through time points to generate a temperature sequence, wherein a unique identification column where each temperature data of the temperature sequence is located stores a corresponding time stamp;
optionally, the present invention may preset a constant monitoring period, determine the temperature through the monitoring period, and then record the temperature to generate the temperature list. The temperatures in the temperature list are recorded by time stamps. The temperature is stored at a fixed time, so that the temperature at that moment can be judged to be abnormal more quickly.
And 2, step: fitting and calculating the temperature sequences of different monitoring periods to determine a fitting value;
according to the fitting value, judging the constant temperature difference rate of different monitoring periods;
and judging whether to regulate and control the constant state again according to the constant temperature difference rate.
Optionally, the present invention may collect temperatures of a plurality of monitoring periods, and generate a plurality of temperature sequences; the temperature constant difference of different periods is judged through the plurality of temperature sequences, the constant adjustment of different periods is realized through the constant difference of the temperature, and the small temperature difference in each period is ensured.
The principle of the technical scheme is as follows: the invention can set a plurality of monitoring periods, judge whether the constant temperature state is stable or not through the fitting of the temperature sequences in the monitoring periods, and is also a method for checking PID constant temperature control.
The beneficial effects of the above technical scheme are that: the calibration and verification of the constant temperature control can be carried out after the PID constant temperature control.
In an alternative embodiment, the fitting calculation includes the steps of:
step 1: determining a temperature sequence K = (L) of a plurality of cycles 1 ，L 2 ，L 3 ……L i ) (ii) a i belongs to M; i is a positive integer; m is the number of cycles;
step 2: performing pairwise fitting calculation on the temperature sequences in different periods, and determining any two period fitting values:
wherein F is any two cycle fitting values; n represents the total number of temperature values monitored at different time intervals in each cycle; l is a radical of an alcohol i A temperature sequence representing the ith cycle; l is i-x A temperature sequence representing any cycle other than the ith cycle; x represents an arbitrary value; the maximum value of i-x is M; beta is a positive real number.
And step 3: generating a fitting value set according to any two periodic fitting values, and determining a mean value of the fitting values;
K＝(F 1 ，F 2 ，F 3 …F w )
F w ＝F(x)
w is the total number of fitted values; f w Is the w-th fitting value; w is W and is a positive integer。
And 4, step 4: determining the constant temperature difference rate according to the fitting mean value; the temperature constant difference rate is a comparison value of the fitting value of any two cycles and the mean value of the fitting values.
And further: the power of the electric heating plate is adjusted to include:
detecting the current operating voltage and current of the electric heating piece, and calculating the latest current output power according to the operating voltage and the operating current;
optionally, the present invention may monitor the operation data of the electric heating sheet, and determine the real-time operation output power of the electric heating sheet, that is, the operation power generated when heat is generated.
Determining a constant temperature according to the PID control timer, and judging the required power of the electric heating piece based on the constant temperature;
optionally, the power required by the generated temperature, namely the driving operation power of the electric heating sheet, can be judged in the process of controlling the rest constant temperature, namely the constant temperature.
Calculating a power change difference between the current output power and the required power;
optionally, the present invention calculates the difference between the operating power and the driving operating power, and can determine the power consumed during the circuit operation;
if the power change difference value is within a preset setting range, calculating the product of the power change difference value and a power change scale factor to obtain a disturbance step length; wherein,
calculating a disturbance step length by using a variable step length disturbance observation algorithm, and initializing and setting a power change scaling factor when the variable step length disturbance observation algorithm is started to be executed;
optionally, the power loss is judged according to a preset range, that is, a range of power loss, to obtain a disturbance step length, where the disturbance step length is a time for determining power loss caused by external interference in a loss process; the externally generated interference may be an external magnetic field, an external unstable ambient temperature, and external component connection interference.
Determining a power correction parameter according to the change scale factor and the current output power;
optionally, through external interference, it may be determined what the output power is if the temperature required to be constantly maintained is reached, so as to determine a power correction parameter, and perform parameter adjustment according to the power correction parameter.
And adjusting power through the power management chip according to the power correction parameter.
The principle of the technical scheme is as follows: the invention needs to adjust the power for constant temperature control, determines the real-time output power through the running current and the running voltage during power adjustment, then calculates the required power of the electric heating piece in a constant temperature state when the constant temperature is reached, and then corrects and adjusts the constant temperature power according to the required power to realize the power control.
The beneficial effects of the above technical scheme are that: the power regulation can be realized, so that the power is controlled to reach a constant temperature state.
Further: the method further comprises the following steps:
acquiring battery operation parameters;
according to the battery operation parameters, calculating the SOC value of the residual electric quantity of the battery through the power management chip;
optionally, the remaining capacity of the battery can be determined according to the battery operation parameters, that is, the output power, the output voltage and the output current when the battery connected with the electric heating sheet performs heat control.
Determining an energy supply state according to the corresponding relation between the residual electric quantity of the battery and the battery operation parameters;
optionally, the present invention may determine the battery operating parameter generated when the battery functions through the remaining power and the battery operating parameter, and may also determine whether the battery is supplying power or not supplying power.
Determining a current output strategy according to the corresponding relation between the energy supply state and the constant temperature control;
optionally, the present invention may determine the output power value of the battery according to the energy supply state and the thermostatic control, that is, the data of the energy supply parameter and the constant temperature, and the remaining capacity of the battery, and determine the current amount output strategy of the battery according to the output power value of the battery.
Determining the remaining time of constant temperature control according to the corresponding relation among the remaining battery capacity, the battery operation parameters and the current output strategy;
optionally, after the current output strategy is determined, the battery may be judged in real time how long the battery is exhausted, and then an alarm of low battery is performed before the battery is exhausted.
And when the remaining time is lower than a preset threshold value, performing low-power alarm.
The principle of the technical scheme is as follows: when the electric heating sheet is actuated by the battery, the electric quantity of the battery has a certain limit, so that the electric heating sheet can judge how long the battery can last according to the electric quantity calculation of the battery, and give an alarm when the electric quantity is low.
The beneficial effects of the above technical scheme are that: the electric quantity is prevented from being insufficient, and constant temperature control cannot be realized.
Further: the method further comprises the following steps:
detecting whether constant temperature control is triggered or not;
detecting the output voltage of the battery after detecting the triggering of the constant temperature control;
and when the detection value of the output voltage is a positive voltage value, judging that the state of the battery is a discharge state, and starting the low-power alarm according to the discharge state.
The invention can judge whether the constant temperature control is triggered, if the constant temperature control state is in the triggered state, the energy supply of the electric heating sheet for low-power alarm can be started under the discharge state.
The principle of the technical scheme is as follows: the invention also can judge and start the low-power alarm function through the state of the battery after the constant temperature control is started.
The beneficial effects of the above technical scheme are that: and low-power monitoring and alarming are realized.
The utility model provides an electric heat piece thermostatic control system which characterized in that includes:
an initialization module: the operation parameters are used for initializing the electric heating piece hardware module; wherein,
the operating parameters include: proportional control coefficients, integral control coefficients and derivative control coefficients;
a deviation calculation module: the deviation parameter is used for calculating the set temperature and the current temperature according to the operation parameter; wherein,
the deviation parameters include: historical deviation sum, current deviation sum difference;
a PID gain calculation module: the PID output gain is calculated according to the deviation parameter;
a constant temperature control module: and the PWM pulse width control circuit is used for controlling the temperature of the heating plate to be in a constant state according to the corresponding relation between the PID output gain and the PWM pulse width output of the electric heating plate.
The principle of the technical scheme is as follows: the invention can judge the current temperature through the operation parameters of the hardware of the electric heating sheet, and then carry out constant temperature regulation according to the difference value between the current temperature and the set temperature.
According to the invention, the battery voltage is boosted to a fixed 5V for output by using the DC-DC chip, and compared with the direct output of the battery in the conventional scheme, the output power of the electric heating piece is not changed along with the change of the battery voltage, so that the whole control system is more stable and has small fluctuation amplitude; the method comprises the steps that a 12-Bit high-precision ADC module is integrated in an MCU (micro control unit) to sample NTC (negative temperature coefficient) temperature, and a software filtering algorithm is adopted, so that the control precision and reliability of a constant temperature system are improved, the temperature of an electric heating sheet is monitored in real time, a safe temperature threshold value is set, if the temperature reaches the safe temperature alarm threshold value, the electric heating sheet is controlled to be turned off for heating, and the safety and stability of a product are improved; based on the PID control algorithm, the MCU can quickly calculate the PWM output value and acts on the electric heating sheet to realize quick response to the set temperature.
The beneficial effects of the above technical scheme are that: the electric heating piece heating device is adopted, so that the electric heating piece heating device can be tightly attached to the surface of a heated object, and the volume of a product is effectively reduced; the thermostatic control is realized by adopting a software PID control algorithm, and the hardware cost is not required to be additionally increased; the temperature control system is stable and rapid, has high reliability, and effectively solves the defects of slow heating and rapid heat dissipation; when the electric heat piece heats, it is little to have temperature control accuracy height, fluctuation range, can carry out real-time supervision's advantage to the temperature, has improved user's experience and safety in utilization.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A constant temperature control method for an electric heating piece is characterized by comprising the following steps:
initializing the operation parameters of the electric heating piece hardware module; wherein,
the operating parameters include: proportional control coefficients, integral control coefficients and derivative control coefficients;
calculating a deviation parameter between the set temperature and the current temperature according to the operation parameter; wherein,
the deviation parameters include: historical deviation sum, current deviation sum difference;
calculating PID output gain according to the deviation parameter;
and controlling the temperature of the heating sheet to be in a constant state according to the corresponding relation between the PID output gain and the PWM pulse width output of the electric heating sheet.
2. The method of claim 1 wherein said hardware module comprises: the device comprises a power management chip, a temperature sensor, a temperature acquisition timer, a PID control timer, a battery and a PWM timer; wherein,
the power management chip is respectively and electrically connected with the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer;
the power management chip is used for controlling the charging and discharging of the battery of the electric heating piece;
the temperature sensor is used for sensing the temperature of the electric heating piece and generating a temperature sensing signal;
the temperature acquisition timer is used for regularly managing a temperature acquisition process according to a control instruction of the power management chip;
the PID control timer is used for controlling the constant temperature of the electric heating piece;
the PWM timer is used for sending out a PWM pulse width signal and adjusting the power of the electric heating piece;
the battery is used for providing electric energy.
3. The thermostatic control method of electric heating plate as claimed in claim 2, wherein the setting parameters include automatic setting parameters and user setting parameters: wherein,
the automatic parameter setting comprises the following steps:
receiving an electric heating piece starting instruction input by a user through the power management chip, and heating a heating object;
setting a first operation period, and carrying out temperature detection based on a temperature sensor at preset time intervals in the first operation period to obtain a plurality of temperature values;
accumulating the temperature values according to a preset period to obtain an accumulated value, and calculating according to the accumulated value to obtain an average induction value;
taking the average induction value as a reference threshold value of each temperature detection in the next period;
and taking the reference threshold value as an automatic setting parameter.
4. The method of claim 2 wherein said initializing includes:
respectively detecting the in-place states of the power management chip, the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer;
receiving real-time state signals of the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer through the power management chip according to the in-place state;
judging whether a fluctuation parameter exists or not according to the real-time state signal; wherein,
when the fluctuation data exists, the power management chip, the temperature sensor, the temperature acquisition timer, the PID control timer and the PWM timer are reset integrally and restarted;
and when the fluctuation data does not exist, judging whether the real-time state signal exceeds a preset reference parameter, and when the real-time state signal does not exceed the reference parameter, determining an initial data value corresponding to the implementation state signal, and taking the initial data value as an initialization value.
5. The thermostatic control method of an electric heating plate according to claim 2, wherein the calculating a deviation parameter between the set temperature and the current temperature based on the operation parameter comprises:
calculating the deviation between the set temperature and the current temperature, and determining the current deviation;
calculating the current deviation for multiple times in the same time interval, and determining the deviation sum calculated for multiple times as a historical deviation sum; wherein,
the historical deviation is shown as follows:
SEk＝Ek+Ek-1+Ek-2+...+E1；
determining two nearest deviations, calculating a proximity deviation, and taking the proximity deviation as a deviation difference; wherein,
the difference between the deviations is shown as follows:
ΔEk＝Ek-Ek-1。
6. a method of controlling constant temperature of an electric heating element as claimed in claim 2, wherein said calculating PID output gain according to said deviation parameter is as follows:
wherein Kp represents a proportional control coefficient; ki represents an integral control coefficient; kd denotes a differential control coefficient; ek represents the difference between the set temperature and the current temperature; ek-1 represents the difference between the last set temperature and the current temperature; pout0 represents a constant to prevent the system from running away when Ek = 0.
7. The method of claim 2, further comprising:
step 1: presetting at least two constant monitoring periods, and determining a temperature recording list of each period;
sequencing a plurality of temperature monitoring data in the temperature recording list through time points to generate a temperature sequence, wherein a corresponding time stamp is stored in a unique identification column where each temperature data of the temperature sequence is located;
step 2: fitting and calculating the temperature sequences of different monitoring periods to determine a fitting value;
according to the fitting value, judging the constant temperature difference rate of different monitoring periods;
and judging whether to readjust the constant state according to the constant temperature difference rate.
8. The method of claim 2 wherein said adjusting the power of the heater strip comprises:
detecting the current operating voltage and current of the electric heating piece, and calculating the latest current output power according to the operating voltage and current;
determining a constant temperature according to the PID control timer, and judging the required power of the electric heating piece based on the constant temperature;
calculating a power change difference between the current output power and the required power;
if the power change difference value is within a preset setting range, calculating the product of the power change difference value and a power change scale factor to obtain a disturbance step length; wherein,
calculating the disturbance step by using a variable step disturbance observation algorithm, and initializing and setting a power change scaling factor when the variable step disturbance observation algorithm is started to be executed;
determining a power correction parameter according to the change scale factor and the current output power;
and adjusting power through the power management chip according to the power correction parameter.
9. The method of claim 2, further comprising:
acquiring battery operation parameters;
according to the battery operation parameters, calculating the SOC value of the residual electric quantity of the battery through the power management chip;
determining an energy supply state according to the corresponding relation among the residual battery capacity, the battery operation parameters and the energy supply state;
determining a current output strategy according to the corresponding relation between the energy supply state and the constant temperature control;
determining the remaining time of constant temperature control according to the corresponding relation among the remaining battery capacity, the battery operation parameters and the current output strategy;
when the remaining time is lower than a preset threshold value, low-power alarm is carried out;
detecting whether constant temperature control is triggered;
detecting the output voltage of the battery after detecting the triggering of the constant temperature control;
and when the detection value of the output voltage is a positive voltage value, judging that the state of the battery is a discharge state, and starting the low-power alarm according to the discharge state.
10. The utility model provides an electric heat piece thermostatic control system which characterized in that includes:
an initialization module: the operation parameters are used for initializing the electric heating piece hardware module; wherein,
the operating parameters include: proportional control coefficients, integral control coefficients and derivative control coefficients;
a deviation calculation module: the deviation parameter is used for calculating the set temperature and the current temperature according to the operation parameter; wherein,
the deviation parameters include: historical deviation sum, current deviation sum difference;
PID gain calculation module: the PID output gain is calculated according to the deviation parameter;
a constant temperature control module: and the controller is used for controlling the temperature of the heating plate to be in a constant state according to the corresponding relation between the PID output gain and the PWM pulse width output of the electric heating plate.
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