CN107329509B - Electric heater and temperature control method and device thereof - Google Patents
Electric heater and temperature control method and device thereof Download PDFInfo
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- CN107329509B CN107329509B CN201710601829.0A CN201710601829A CN107329509B CN 107329509 B CN107329509 B CN 107329509B CN 201710601829 A CN201710601829 A CN 201710601829A CN 107329509 B CN107329509 B CN 107329509B
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Abstract
The invention discloses an electric heater and a temperature control method and a temperature control device thereof, wherein the temperature control method of the electric heater comprises the following steps: acquiring an ambient sampling temperature after the ambient temperature reaches a target temperature; determining a power output value through a self-adaptive PI (proportional integral) adjustment algorithm according to the difference value between the environment sampling temperature and the target temperature, wherein in the self-adaptive PI adjustment algorithm, a P parameter of a K period is determined according to the temperature overshoot of the K-1 period and the temperature overshoot of the K-2 period, and K is a positive integer greater than 1; and obtaining the control parameter of the power device in the current period according to the power output value, and controlling the conduction of the power device according to the control parameter. The temperature control device can be suitable for various environmental interferences, keeps the temperature basically stable, and improves the use comfort experience.
Description
Technical Field
The invention belongs to the technical field of electric appliance manufacturing, and particularly relates to a temperature control method of an electric heater, a temperature control device of the electric heater and the electric heater with the temperature control device.
Background
At present, the electric heater mostly adopts the mode of galvanic couple heating, separation temperature sampling, relay third gear hysteresis control, however, this mode has certain limitation. For example, there is a delay between the heat load heating and the ambient temperature adjustment of the electric heater, and the hysteresis control sets the gear temperature limit value, which may cause the temperature overshoot value to be too large, as shown in fig. 1, the ambient temperature exceeds the (upper limit or lower limit) limit value of the hysteresis control too much, i.e. there is a problem of poor temperature stability, which may greatly reduce the comfort experience of the user using the electric heater.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the invention provides a temperature control method of an electric heater, which can keep the temperature basically stable and improve the comfort experience of the electric heater. The invention also provides a temperature control device of the electric heater and the electric heater with the temperature control device.
In order to solve the above problem, an embodiment of the present invention provides a temperature control method for an electric heater, including: acquiring an ambient sampling temperature after the ambient temperature reaches a target temperature; determining a power output value through a self-adaptive PI (proportional integral) adjustment algorithm according to the difference value between the environment sampling temperature and the target temperature, wherein in the self-adaptive PI adjustment algorithm, a P parameter of a K period is determined according to the temperature overshoot of the K-1 period and the temperature overshoot of the K-2 period, and K is a positive integer greater than 1; and obtaining a control parameter of the power device in the current period according to the power output value, and controlling the conduction of the power device according to the control parameter.
According to the temperature control method of the electric heater, after the temperature reaches the target temperature, the adaptive PI regulation is carried out, the P parameter of the K period is determined according to the temperature overshoot of the K-1 period and the temperature overshoot of the K-2 period, the temperature control method can adapt to various complex environments, the temperature is kept basically stable, and the use comfort experience is improved.
In some embodiments of the present invention, determining the P parameter for the K-th cycle based on the temperature overshoot for the K-1 th cycle and the temperature overshoot for the K-2 th cycle includes:
if the requirement of | M (K-1) -M (K-2) | is less than or equal to phi
Then K isp(K)＝Kp(K-1), wherein | M (K-1) | is the temperature overshoot of the K-1 th cycle, | M (K-2) | is the temperature overshoot of the K-2 th cycle, and φ is a set difference,
to overshoot the threshold, Kp(K) Is the P parameter of the Kth period, Kp(K-1) is the P parameter of the K-1 period;
or, if M (K-1) is satisfied>M (K-2) and Kp(K-1)>Kp(K-2)，Kp(K)＝Kp(K-1) - Δ, wherein Kp(K-2) is a P parameter of the K-2 period, and delta is a set variation;
or, if M (K-1) is satisfied>M (K-2) and Kp(K-1)<Kp(K-2)，Kp(K)＝Kp(K-1)+Δ；
Or, if M (K-1) is satisfied<M (K-2) and Kp(K-1)>Kp(K-2)，Kp(K)＝Kp(K-1)+Δ；
Or, if M (K-1) is satisfied<M (K-2) and Kp(K-1)<Kp(K-2)，Kp(K)＝Kp(K-1)-Δ。
In some embodiments of the invention, the temperature control method further comprises: acquiring an initial ambient temperature after detecting a start signal; determining soft start power according to the difference value between the initial environment temperature and the target temperature; obtaining a control parameter of a power device according to the soft start power; and controlling the conduction of the power device according to the control parameter to adjust the heat load of the electric heater to output the soft start power until the ambient temperature reaches the target temperature. The power is adjusted according to the difference between the ambient temperature and the target temperature, the temperature can be quickly and effectively adjusted to the set target temperature, and the comfortable experience of the electric heater is improved.
In some embodiments of the invention, deriving the control parameter of the power device from the soft-start power comprises:
and inquiring a corresponding data table of the soft start power and the conduction angle according to the soft start power to obtain the conduction angle of the power device.
In order to solve the above problem, a temperature control device of an electric heater according to another embodiment of the present invention includes: the first acquisition module is used for acquiring the environment sampling temperature after the environment temperature reaches the target temperature; the PI adjusting module is used for determining a power output value through a self-adaptive PI adjusting algorithm according to the difference value between the environment sampling temperature and the target temperature, wherein in the self-adaptive PI adjusting algorithm, a P parameter of a K period is determined according to the temperature overshoot of the K-1 period and the temperature overshoot of the K-2 period, and K is a positive integer greater than 1; and the first control module is used for obtaining the control parameter of the power device in the current period according to the power output value and controlling the conduction of the power device according to the control parameter.
According to the temperature control device of the electric heater, after the temperature reaches the target temperature, the adaptive PI regulation is carried out, the P parameter of the K period is determined according to the temperature overshoot of the K-1 period and the temperature overshoot of the K-2 period, so that the temperature control device of the electric heater can adapt to various complex environments, the temperature is kept basically stable, and the use comfort experience is improved.
In some embodiments of the invention, the PI regulation module comprises:
a first scale parameter determination unit for determining whether or not | M (K-1) -M (K-2) | is less than or equal to phi
When, Kp(K)＝Kp(K-1), wherein | M (K-1) | is the temperature overshoot of the K-1 th cycle, | M (K-2) | is the temperature overshoot of the K-2 th cycle, and φ is a set difference,
to overshoot the threshold, Kp(K) Is the P parameter of the Kth period, Kp(K-1) is the P parameter of the K-1 period;
a second scale parameter determining unit for determining whether M (K-1) is satisfied>M (K-2) and Kp(K-1)>KpWhen (K-2), Kp(K)＝Kp(K-1) - Δ, wherein Kp(K-2) is a P parameter of the K-2 period, and delta is a set variation;
a third ratio parameter determining unit for determining whether M (K-1) is satisfied>M (K-2) and Kp(K-1)<KpWhen (K-2), Kp(K)＝Kp(K-1)+Δ；
A fourth scale parameter determining unit for determining whether M (K-1) is satisfied<M (K-2) and Kp(K-1)>KpWhen (K-2), Kp(K)＝Kp(K-1)+Δ；
A fifth scale parameter determining unit for determining whether M (K-1) is satisfied<M (K-2) and Kp(K-1)<KpWhen (K-2), Kp(K)＝Kp(K-1)-Δ。
In some embodiments of the present invention, the temperature control apparatus of the electric heater further includes: the second acquisition module is used for acquiring the initial environment temperature after the starting signal is detected; the determining module is used for determining soft start power according to the difference value between the initial environment temperature and the target temperature before acquiring the environment sampling temperature; the query module is used for obtaining the control parameters of the power device according to the soft starting power; and the second control module is used for controlling the conduction of the power device according to the control parameters so as to adjust the thermal load of the electric heater to output the soft start power until the ambient temperature reaches the target temperature. The power is adjusted according to the difference between the ambient temperature and the target temperature, the temperature can be quickly and effectively adjusted to the set target temperature, and the comfortable experience of the electric heater is improved.
In some embodiments of the present invention, the query module queries a corresponding data table of soft start power and conduction angle according to the soft start power to obtain the conduction angle of the power device.
Based on the temperature control device in the above aspect, an electric heating fan in an embodiment of another aspect of the present invention includes: an ambient temperature detection means for detecting an ambient temperature; power devices and thermal loads; and, the temperature control device of the electric heater.
The electric heater of the embodiment of the invention can adapt to various environments by controlling the temperature through the temperature control device, keeps the temperature basically stable and improves the use comfort experience.
In some embodiments of the present invention, the power device includes one of a triac and a power MOS (metal-oxide-semiconductor) transistor.
Some embodiments of the present invention further provide a computer device, including a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the temperature control method of the electric heater according to any one of claims 1 to 4.
Some embodiments of the present invention also propose a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a temperature control method of an electric heater according to any one of claims 1 to 4.
Some embodiments of the present invention further provide a computer program product, wherein when the instructions of the computer program product are executed by a processor, the method for controlling the temperature of the electric heater is performed.
Drawings
FIG. 1 is a schematic diagram of the thermostatic stability of a relay control hysteresis control of ambient temperature in the related art;
fig. 2 is a schematic block diagram of an electric heater control according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of drive waveforms and rectified output waveforms when using unidirectional full wave rectification control in accordance with one embodiment of the present invention;
fig. 4 is a flowchart of a temperature control method of an electric heater according to an embodiment of the present invention;
FIG. 5 is a graph showing a change in ambient temperature according to the related art;
fig. 6 is a flowchart of a temperature control method of an electric heater according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an adaptive PI adjustment algorithm according to one embodiment of the present invention;
FIG. 8 is a flow chart of the adjustment process of the P parameter in the adaptive PI adjustment algorithm according to one embodiment of the present invention;
fig. 9 is a block diagram of a temperature control apparatus of an electric heater according to an embodiment of the present invention;
fig. 10 is a block diagram of a temperature control apparatus of an electric heater according to an embodiment of the present invention;
fig. 11 is a block diagram of a temperature control apparatus of an electric heater according to an embodiment of the present invention; and
fig. 12 is a block diagram of an electric heater according to an embodiment of the present invention.
Reference numerals:
an electric heater 1000;
a temperature control device 100, an ambient temperature detection device 200, a power device 300, and a thermal load 400;
a first acquisition module 10, a PI regulation module 20 and a first control module 30, a second acquisition module 40, a determination module 50, a query module 60 and a second control module 70;
a first scale parameter determining unit 21, a second scale parameter determining unit 22, a third scale parameter determining unit 23, a fourth scale parameter determining unit 24, and a fifth scale parameter determining unit 25.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An electric heater, a temperature control method thereof and a temperature control apparatus according to embodiments of the present invention are described below with reference to the accompanying drawings.
The basic control architecture of the embodiment of the invention is shown in fig. 2, and comprises an MCU control, an ambient temperature detection, a zero-crossing detection, a driving circuit, a power device such as a bidirectional thyristor or an MOS transistor, and a thermal load such as a galvanic couple, a zero line N, and a live line L. The power device drives the electric couple rod to generate heat, and can adopt the forms of single-phase full-wave rectification and timing wave dropping, and the power control of the single-phase full-wave rectification is better than the form of the timing wave dropping in terms of the timeliness of temperature control, and preferably adopts a unidirectional full-wave rectification control mode.
For the single-phase full-wave rectification power control mode, fig. 3 is a schematic diagram of a driving waveform and a rectified output waveform according to an embodiment of the present invention, wherein UoFor outputting voltage to the load, UgIs a driving pulse signal. When a pure resistive load such as the galvanic couple rod in fig. 3 is used, the effective value of the output power calculated according to the power counting formula is:
wherein, PoFor the effective value of power, R is the resistance value of the galvanic couple bar, α is the conduction angle of the triac, it can be seen that the output power corresponding to the phase control α is not linear, but the linear control of the power can be realized by indirectly looking up the table.
A temperature control method of an electric heater according to an embodiment of the present invention is described below with reference to the accompanying drawings.
Fig. 4 is a flowchart illustrating a temperature control method of an electric heater according to an embodiment of the present invention, and as shown in fig. 4, the temperature control method includes:
s1, acquiring an initial ambient temperature after detecting the start signal.
For example, the initial ambient temperature when the electric heater is turned on may be detected by the ambient temperature detection device, and transmitted to the MCU; and the user can set the required target temperature by operating the setting device, and the setting device transmits the set target temperature to the MCU.
And S2, determining the soft start power according to the difference value between the initial environment temperature and the target temperature.
After the electric heater is started, the electric heater needs to be soft started for a period of time, and constant temperature regulation and control are performed after the target temperature is reached. In the embodiment of the invention, the soft start power is set according to the difference between the initial environment temperature and the target temperature, specifically, the difference between the initial environment temperature and the target temperature satisfies the following conditions: p is Jp(Tcmp-Ts) Where p is the soft start power, JpIs a proportionality coefficient, TcmpTo set the target temperature, TsThe soft start power is obtained by the above relationship for the initial ambient temperature. Of course, the soft-start power may be set according to the difference between the initial ambient temperature and the target temperature in other applicable manners.
And S3, obtaining the control parameters of the power device according to the soft start power.
And S4, controlling the conduction of the power device according to the control parameters to adjust the power output soft start power of the heat load of the electric heater until the ambient temperature reaches the target temperature.
For example, through table look-up, α -Tab (p), the conduction angle corresponding to the bidirectional thyristor is obtained through query, the bidirectional thyristor is controlled by a driving circuit, the proportion of the on-off time of the bidirectional thyristor in a set period is changed, and the purpose of adjusting the voltage at two ends of the thermal load, namely the power, namely the thermal load outputs the corresponding power is achieved.
The above may be understood as a soft start control process of the electric heater such that the ambient temperature reaches the target temperature, and in the related art, when the ambient temperature is too low or the ambient space where the electric heater is located is too large, the user sets the low level, and the ambient temperature gradually increases from the initial temperature T0, but may not reach the set temperature at all, as shown in fig. 5. In the application, the environmental temperature is considered by reference, and the soft starting power is determined according to the difference value between the initial environmental temperature and the set target temperature, so that the situation can be avoided, the power is adjusted according to the difference value between the environmental temperature and the target temperature, the temperature can be quickly and effectively adjusted to the set target temperature, and the comfort experience of the electric heater is improved.
Further, after the ambient temperature reaches the target temperature, constant temperature regulation is performed. As shown in fig. 6, the maintaining of the temperature constant by the adaptive PI regulation specifically includes:
s10, acquiring an ambient sample temperature after the ambient temperature reaches the target temperature.
Specifically, the heat load of the electric heater generates heat to change the ambient temperature, the ambient sampling temperature may be a reflection of the heat load output temperature, such as Tout in fig. 7, fig. 7 is a schematic diagram of the principle of PI adjustment according to an embodiment of the present invention, where the ambient sampling temperature may be an ambient temperature value of sampling stabilization processing, such as an average value of a plurality of sampling temperatures, such as temperature Tb after processing Tout according to a sampling ratio factor in fig. 6.
And S20, determining the power output value of the heat load of the electric heater through a self-adaptive PI regulation algorithm according to the difference value between the environment sampling temperature and the target temperature.
Referring to FIG. 7, the target temperature T is set according tocmpThe difference with the ambient sampling temperature, i.e. the sampling stabilization processing value Tb, is set to delta T, and the power output value is determined by the adaptive PI regulation algorithm, which isIn the middle, the proportional link of PI regulation is mainly used for improving dynamic performance, and the integral link is mainly used for eliminating static errors. In one embodiment of the present invention, after the discrete difference of the PI regulator, the K-th cycle output is:
wherein p iskPower of the K-th cycle, KpIs a proportional parameter hereinafter also referred to as P parameter, KIAre integral parameters. Since the external environment is a complex interfering system with respect to PI temperature control, and environmental humidity, air composition and other changes can interfere with the system, it is necessary to dynamically adjust KpIn some embodiments of the present invention, in the adaptive PI adjustment algorithm, the P parameter of the K-th cycle is determined according to the overshoot of the temperature in the K-1 th cycle, which is the absolute value of the difference between the output temperature and the target temperature, and the overshoot of the temperature in the K-2 th cycle, which is a positive integer greater than 1, so as to adapt to various complex environments and keep the temperature substantially stable, which is described in detail below.
And S30, obtaining the control parameter of the power device in the current period according to the power output value, and controlling the conduction of the power device according to the control parameter.
Specifically, the conduction angle α corresponding to the power output value can be obtained by looking up a table, and as shown in fig. 2 and 3, the triac is controlled by the driving circuit after each zero crossing period to output the corresponding power.
In particular, in the PI regulation algorithm, the proportional parameter K is usedpIf the self-adaptive adjustment of (1) is satisfied, the value of | M (K-1) -M (K-2) | is less than or equal to phi
If the temperature is not changed greatly and is relatively stable, K isp(K)＝Kp(K-1) maintaining the ratio parameter of the previous cycle, wherein | M (K-1) | is the temperature overshoot of the K-1 th cycle, | M (K-2) | is the temperature overshoot of the K-2 th cycle, and φ is a set difference,
to overshoot the threshold, Kp(K) Is the P parameter of the Kth period, Kp(K-1) is the P parameter of the K-1 period; or, if M (K-1) is satisfied>M (K-2) and Kp(K-1)>Kp(K-2) indicating that the temperature is deviated from the target temperature and the P parameter is selected to be larger, the P parameter is reduced, and Kp(K)＝Kp(K-1) - Δ, wherein Kp(K-2) is a P parameter of the K-2 period, and delta is a set variable quantity; or, if M (K-1) is satisfied>M (K-2) and Kp(K-1)<Kp(K-2) indicating that the P parameter selection becomes smaller and the temperature deviates from the target temperature and increases, the magnitude of the P parameter, namely, K, is increasedp(K)＝Kp(K-1) + Δ; or, if M (K-1) is satisfied<M (K-2) and Kp(K-1)>Kp(K-2) when the P parameter selection is larger and the temperature deviates from the target temperature and is decreased, the increase of the P parameter, that is, K is continued to be decreasedp(K)＝Kp(K-1) + Δ; or, if M (K-1) is satisfied<M (K-2) and Kp(K-1)<Kp(K-2) that the P parameter is selected to be smaller and the temperature deviates from the target temperature to be smaller, the P parameter is continuously reduced, namely Kp(K)＝Kp(K-1)-Δ。
Based on the above description, fig. 8 is a flowchart of P parameter adjustment in an adaptive PI adjustment algorithm according to an embodiment of the present invention, where in the PI adjustment algorithm, several step sizes, for example, 10 step sizes, are set as a period, and a temperature overshoot is recorded in each period, as shown in fig. 8, specifically including:
s100, entering the K-th period, and judging whether the value of | M (K-1) -M (K-2) | is less than or equal to phi or not
If yes, go to step S110, otherwise go to step S120.
S110，Kp(K)＝Kp(K-1)。
S120, judging whether M (K-1) > M (K-2) is met, if so, entering step S130, otherwise, entering step S140.
S130, judging whether K is satisfiedp(K-1)>Kp(K-2), if satisfied, proceed to step S160, otherwise proceed to step S150.
S140, judging whether K is satisfiedp(K-1)>Kp(K-2), if satisfied, proceed to step S150, otherwise proceed to step S160.
S150，Kp(K)＝Kp(K-1)+Δ。
S160，Kp(K)＝Kp(K-1)-Δ。
In summary, in the temperature control method of the electric heater according to the embodiment of the present invention, during soft start, the soft start power is determined according to the difference between the initial environment temperature and the set target temperature, so that the temperature can be quickly and effectively adjusted to the target temperature; after the target temperature is reached, self-adaptive PI regulation is carried out, wherein the P parameter of the K period is determined according to the temperature overshoot of the K-1 period and the temperature overshoot of the K-2 period, the change of the external environment can be adapted, the temperature is kept basically constant, and the comfortable experience of the electric heater is improved.
A temperature control apparatus of an electric heater according to another aspect embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 9 is a block diagram of a temperature control apparatus of an electric heater according to an embodiment of the present invention, and as shown in fig. 9, the temperature control apparatus 100 includes a first obtaining module 10, a PI adjusting module 20, and a first control module 30.
And after the ambient temperature reaches the target temperature, carrying out constant temperature regulation. The first obtaining module 10 is configured to obtain an ambient sampling temperature after the ambient temperature reaches a target temperature; the heat load of the electric heater generates heat to change the ambient temperature, and the ambient sampling temperature may be a reflection of the heat load output temperature, such as Tout in fig. 7, where the ambient sampling temperature may be an ambient temperature value of the sampling stabilization process, such as temperature Tb after Tout is processed according to the sampling rate factor in fig. 7.
The PI adjustment module 20 is configured to determine a power output value through an adaptive PI adjustment algorithm according to a difference between an environment sampling temperature and a target temperature, where in the adaptive PI adjustment algorithm, a P parameter of a K-th period is determined according to a temperature overshoot of the K-1 th period and a temperature overshoot of the K-2 th period, where K is a positive integer greater than 1, and may adapt to various complex environments and keep a temperature substantially stable, which is described in detail below.
The first control module 30 is used for obtaining a control parameter of the power device in the current period according to the power output value and controlling the conduction of the power device according to the control parameter, for example, the conduction angle α corresponding to the power output value is obtained by looking up a table, as shown in fig. 2 and 3, the bidirectional thyristor is controlled by the driving circuit after the zero crossing of each period, and the corresponding power is output.
Specifically, as shown in fig. 10, which is a block diagram of a temperature control apparatus of an electric heater according to an embodiment of the present invention, the PI adjustment module 20 includes a first proportional parameter determining unit 21, a second proportional parameter determining unit 22, a third proportional parameter determining unit 23, a fourth proportional parameter determining unit 24, and a fifth proportional parameter determining unit 25.
Wherein the first scale parameter determining unit 21 is configured to satisfy | M (K-1) -M (K-2) | ≦ φ
When, Kp(K)＝Kp(K-1), wherein | M (K-1) | is the temperature overshoot of the K-1 th period, | M (K-2) | is the temperature overshoot of the K-2 th period, and phi is a set difference,
to overshoot the threshold, Kp(K) Is the P parameter of the Kth period, Kp(K-1) is the P parameter of the K-1 th period.
The second scale parameter determining unit 22 is used for satisfying M (K-1)>M (K-2) and Kp(K-1)>KpWhen (K-2), Kp(K)＝Kp(K-1) - Δ, wherein Kp(K-2) is the P parameter of the K-2 period,Δ is a set variation.
The third ratio parameter determining unit 23 is used for satisfying M (K-1)>M (K-2) and Kp(K-1)<KpWhen (K-2), Kp(K)＝Kp(K-1)+Δ。
The fourth scale parameter determining unit 24 is used for satisfying M (K-1)<M (K-2) and Kp(K-1)>KpWhen (K-2), Kp(K)＝Kp(K-1)+Δ。
The fifth scale parameter determining unit 25 is configured to satisfy M (K-1)<M (K-2) and Kp(K-1)<KpWhen (K-2), Kp(K)＝Kp(K-1)-Δ。
Fig. 11 is a block diagram of a temperature control apparatus of an electric heater according to an embodiment of the present invention, and the temperature control apparatus 100 further includes a second obtaining module 40, a determining module 50, an inquiring module 60, and a second control module 70.
The second obtaining module 40 is configured to obtain an initial ambient temperature after detecting the start signal; the determination module 50 is configured to determine a soft start power based on a difference between an initial ambient temperature and a target temperature.
The query module 60 is configured to obtain a control parameter of the power device according to the soft-start power, for example, the power device may include a triac or a power MOS transistor. The second control module 70 is configured to control the conduction of the power device according to the control parameter to adjust the thermal load output soft start power of the electric heater until the ambient temperature reaches the target temperature.
In order to achieve simpler control, linear control of power can be realized by looking up a table, in some embodiments of the present invention, the query module 60 queries a data table of correspondence between soft start power and conduction angle according to the soft start power to obtain the conduction angle of the power device, for example, through looking up a table α ═ tab (p), the conduction angle corresponding to the triac is obtained by query, the triac is controlled by the driving circuit, the proportion of the on-off time of the triac in a set period is changed, and the purpose of adjusting the voltage across the thermal load, that is, the power, is output by the thermal load.
Considering the environmental temperature, the soft start power is determined according to the difference value between the initial environmental temperature and the set target temperature, so that the condition that the set temperature cannot be reached due to the fact that low-grade low-power output is selected when the environmental temperature is too low or the environmental space is too large can be avoided, the power is adjusted according to the difference value between the environmental temperature and the target temperature, the temperature can be quickly and effectively adjusted to the set target temperature, and the comfort experience of the electric heater in use is improved.
In the temperature control device 100 of the electric heater according to the embodiment of the present invention, during soft start, the determining module 50 determines the soft start power according to the difference between the initial environment temperature and the set target temperature, so that the temperature can be quickly and effectively adjusted to the target temperature; after the target temperature is reached, the PI adjusting module 20 performs self-adaptive PI adjustment, wherein the P parameter of the K period is determined according to the temperature overshoot of the K-1 period and the temperature overshoot of the K-2 period, so that the change of the external environment can be adapted, the temperature is kept basically constant, and the comfortable experience of the electric heater is improved.
Based on the temperature control device of the electric heater according to the above-mentioned aspect embodiment, an electric heater according to another aspect embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 12, which is a block diagram of an electric heater according to an embodiment of the present invention, the electric heater 1000 includes the temperature control device 100, the ambient temperature detection device 200, the power device 300, and the thermal load 400 of the above-described aspect.
Wherein, the ambient temperature detection device 200 is used for detecting the ambient temperature; the temperature control device 100 determines the soft start power according to the initial environment temperature and the set target temperature, and performs adaptive PI adjustment after reaching a constant temperature, and adapts to the change of the environment by adjusting the P parameter of each period, and the specific control process of the temperature control device 100 refers to the above description, and is not described herein again. The power device 300 is turned on according to the control parameter determined by the temperature control apparatus 100 to adjust the power of the thermal load 400, such as a triac or a power MOS transistor.
According to the electric heater 1000 provided by the embodiment of the invention, the temperature control is carried out through the temperature control device 100, so that the temperature can be quickly and effectively adjusted to the target temperature, and the use comfort is improved.
In some embodiments of the present invention, the power device 400 of the electric heater 100 may adopt one of a triac and a power MOS transistor, without a relay, without noise, and thus, the service life is prolonged.
In some embodiments of the present invention, a computer device is further provided, where the computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the method for controlling the temperature of the electric heater in the above embodiments is implemented.
In some embodiments of the present invention, a computer-readable storage medium is also provided, on which a computer program is stored, which when executed by a processor implements the temperature control method of the electric heater of the above embodiments.
In some embodiments of the present invention, a computer program product is also provided, and when instructions in the computer program product are executed by a processor, the method for controlling the temperature of the electric heater of the above embodiments is performed.
It should be noted that in the description of the present specification, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and that the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (12)
1. A temperature control method of an electric heater is characterized by comprising the following steps:
acquiring an ambient sampling temperature after the ambient temperature reaches a target temperature;
determining a power output value of a thermal load of the electric heater through a self-adaptive PI (proportional integral) adjustment algorithm according to the difference value between the environment sampling temperature and the target temperature, wherein in the self-adaptive PI adjustment algorithm, a P parameter of a K period is determined according to a temperature overshoot of the K-1 period and a temperature overshoot of the K-2 period, and K is a positive integer greater than 1;
obtaining a control parameter of a power device of the electric heater in the current period according to the power output value, and controlling the conduction of the power device according to the control parameter;
determining the P parameter of the K period according to the temperature overshoot of the K-1 period and the temperature overshoot of the K-2 period, wherein the P parameter comprises the following steps:
if the requirement of | M (K-1) -M (K-2) | is less than or equal to phi
Then K isp(K)＝Kp(K-1), wherein | M (K-1) | is the temperature overshoot of the K-1 th cycle, | M (K-2) | is the temperature overshoot of the K-2 th cycle, and φ is a set difference,
to overshoot the threshold, Kp(K) Is the P parameter of the Kth period, KpAnd (K-1) is the P parameter of the K-1 period.
2. The temperature control method of an electric heater of claim 1, wherein determining the P parameter of the K-th cycle according to the temperature overshoot of the K-1 th cycle and the temperature overshoot of the K-2 th cycle comprises:
if M (K-1) is satisfied>M (K-2) and Kp(K-1)>Kp(K-2)，Kp(K)＝Kp(K-1) - Δ, wherein Kp(K-2) is a P parameter of the K-2 period, and delta is a set variation;
or, if M (K-1) is satisfied>M (K-2) and Kp(K-1)<Kp(K-2)，Kp(K)＝Kp(K-1)+Δ；
Or, if M (K-1) is satisfied<M (K-2) and Kp(K-1)>Kp(K-2)，Kp(K)＝Kp(K-1)+Δ；
Or, if M (K-1) is satisfied<M (K-2) and Kp(K-1)<Kp(K-2)，Kp(K)＝Kp(K-1)-Δ。
3. The temperature control method of an electric heater of claim 1, wherein the temperature control method further comprises:
acquiring an initial ambient temperature after detecting a start signal;
determining soft start power according to the difference value between the initial environment temperature and the target temperature;
obtaining a control parameter of a power device according to the soft start power; and
and controlling the conduction of the power device according to the control parameter so as to adjust the heat load of the electric heater to output the soft start power until the ambient temperature reaches the target temperature.
4. The temperature control method of an electric heater according to claim 3, wherein obtaining the control parameter of the power device according to the soft start power comprises:
and inquiring a corresponding data table of the soft start power and the conduction angle according to the soft start power to obtain the conduction angle of the power device.
5. The utility model provides a temperature control device of electric heater which characterized in that includes:
the first acquisition module is used for acquiring the environment sampling temperature after the environment temperature reaches the target temperature;
the PI adjusting module is used for determining a power output value through a self-adaptive PI adjusting algorithm according to the difference value between the environment sampling temperature and the target temperature, wherein in the self-adaptive PI adjusting algorithm, a P parameter of a K period is determined according to the temperature overshoot of the K-1 period and the temperature overshoot of the K-2 period, and K is a positive integer greater than 1;
the first control module is used for obtaining a control parameter of the power device in the current period according to the power output value and controlling the conduction of the power device according to the control parameter;
the PI regulation module comprises:
a first scale parameter determination unit for determining whether or not | M (K-1) -M (K-2) | is less than or equal to phi
When, Kp(K)＝Kp(K-1), wherein | M (K-1) | is the temperature overshoot of the K-1 th cycle, | M (K-2) | is the temperature overshoot of the K-2 th cycle, and φ is a set difference,
to overshoot the threshold, Kp(K) Is the P parameter of the Kth period, Kp(K-1) is the K-1 periodP parameter of (2).
6. The temperature control device of the electric heater of claim 5, wherein the PI adjusting module comprises:
a second scale parameter determining unit for determining whether M (K-1) is satisfied>M (K-2) and Kp(K-1)>KpWhen (K-2), Kp(K)＝Kp(K-1) - Δ, wherein Kp(K-2) is a P parameter of the K-2 period, and delta is a set variation;
a third ratio parameter determining unit for determining whether M (K-1) is satisfied>M (K-2) and Kp(K-1)<KpWhen (K-2), Kp(K)＝Kp(K-1)+Δ；
A fourth scale parameter determining unit for determining whether M (K-1) is satisfied<M (K-2) and Kp(K-1)>KpWhen (K-2), Kp(K)＝Kp(K-1)+Δ；
A fifth scale parameter determining unit for determining whether M (K-1) is satisfied<M (K-2) and Kp(K-1)<KpWhen (K-2), Kp(K)＝Kp(K-1)-Δ。
7. The temperature control device of the electric heater as claimed in claim 5, further comprising:
the second acquisition module is used for acquiring the initial environment temperature after the starting signal is detected;
the determining module is used for determining soft start power according to the difference value between the initial environment temperature and the target temperature before acquiring the environment sampling temperature;
the query module is used for obtaining the control parameters of the power device according to the soft starting power;
and the second control module is used for controlling the conduction of the power device according to the control parameters so as to adjust the thermal load of the electric heater to output the soft start power until the ambient temperature reaches the target temperature.
8. The temperature control device of an electric heater as claimed in claim 7, wherein the query module queries a corresponding data table of the soft start power and the conduction angle according to the soft start power to obtain the conduction angle of the power device.
9. An electric heater, comprising:
an ambient temperature detection means for detecting an ambient temperature;
power devices and thermal loads; and
a temperature control apparatus for an electric heater as claimed in any one of claims 5 to 8.
10. The electric heater according to claim 9, wherein the power device comprises one of a triac and a power MOS transistor.
11. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method for temperature control of an electric heater according to any one of claims 1-4 when executing the program.
12. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that the program, when executed by a processor, implements a method of temperature control of an electric heater according to any of claims 1-4.
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| CN110687942B (en) * | 2019-10-24 | 2020-10-16 | 北京嘉洁能科技股份有限公司 | Temperature compensation method for carbon fiber controller |
| TWI786351B (en) * | 2019-12-02 | 2022-12-11 | 華碩電腦股份有限公司 | Fan control system and method |
| CN112491011B (en) * | 2020-11-19 | 2023-08-15 | 深圳市英威腾电动汽车驱动技术有限公司 | Temperature control method, device, apparatus and computer readable storage medium |
| CN115453856A (en) * | 2022-09-23 | 2022-12-09 | 中国兵器工业集团第二一四研究所苏州研发中心 | Self-adaptive PID control method and device for refrigerating machine |
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