CN114229043A - Intelligent active thermal control method of thermal control system based on power and temperature balance - Google Patents

Intelligent active thermal control method of thermal control system based on power and temperature balance Download PDF

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CN114229043A
CN114229043A CN202111602032.5A CN202111602032A CN114229043A CN 114229043 A CN114229043 A CN 114229043A CN 202111602032 A CN202111602032 A CN 202111602032A CN 114229043 A CN114229043 A CN 114229043A
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罗从杰
安建欣
蒋宇潇
蒋祖运
杨乾远
刘德源
王红运
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CETC 34 Research Institute
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Abstract

The invention discloses an intelligent active heat control method of a heat control system based on power and temperature balance, which is characterized by comprising the following steps of: 1) collecting data; 2) initializing system parameters; 3) judging the opening condition; 4) determining a heating priority by using the weight; 5) starting a first heating mode; 6) the first heating meets the set value; 7) the heating mark is changed into a heated mark; 8) entering a temperature control mode; 9) entering a PWM temperature control mode; 10) judging the temperature at regular time; 11) heating is withdrawn; 12) judging a failure duty ratio; 13) an idle wait timer is entered. The method is based on a current loop thermal control mode of PWM duty ratio regulation, so that the total power does not exceed the set power under the condition of balanced heating of each channel, and the power balance is ensured.

Description

Intelligent active thermal control method of thermal control system based on power and temperature balance
Technical Field
The invention relates to a spacecraft technology, in particular to a spacecraft thermal control technology and a power supply technology, and specifically relates to an intelligent active thermal control method of a thermal control system based on power and temperature balance.
Background
Generally, the thermal control of spacecraft equipment is satisfied by thermal control techniques such as heat dissipation and thermal insulation. However, when the spacecraft runs under the influence of complex environmental factors of the spacecraft running orbit, the running attitude and the equipment working mode, the equipment can be ensured to run normally at an expected environmental temperature by active temperature control by adopting an active heat control technology under a low-temperature environment. The common active thermal control method usually adopts a temperature sensor as the only index of temperature control to carry out closed-loop return regulation, and for each system module of the spacecraft, the problem of irregular sudden change of power consumption can be caused while the temperature control is carried out only by taking temperature control as the aim, so that the influence on the overall power quality of the spacecraft is not negligible.
Along with the complex and diversified development of spacecraft tasks, the control requirement of each system module of the spacecraft on the temperature is higher and higher, and the higher energy consumption requirement is provided for an active thermal control system, in practical application, the thermal control peak power consumption distributed to the thermal control system by a power supply system is far smaller than the total rated power consumption of a heating load applied by thermal control, in order to prevent power overload, the design requirement is that thermal control units cannot operate at full load, a reasonable thermal control strategy is matched for thermal control, and the design scheme can meet the thermal control requirement and can meet the total power requirement.
In the prior art, a patent with a Chinese patent publication number of CN202011068753.8 discloses a power-balanced autonomous thermal control method for a spacecraft, the technical scheme performs power temperature control processing by a staged thermal control enabling mode, establishes a plurality of sub-modes by setting a thermal control sub-mode to meet the condition that the total temperature control power does not exceed the peak power, the total power of heaters in temperature control loops enabled in each sub-mode does not exceed the peak power, the temperature control loops enabled in all sub-modes cover the temperature control loops required to control the temperature in the thermal control mode, and controls the temperature by sub-mode-like switching to meet the condition that the total thermal control power does not exceed the thermal control rated power, and the technical scheme mainly has the following defects: the technical scheme combines a heater control loop into a thermal control sub-mode execution module, compares the total power of sub-modules with the peak power of a spacecraft, and switches the sub-modes periodically during heating on the premise that the total power of the sub-modules does not exceed the peak power of the spacecraft, and switches the next sub-mode when the temperature control target temperature of the sub-modules meets a temperature control threshold under the condition that the sub-modules can not meet the temperature control threshold, wherein the switching condition has a large defect in practical application, when the heaters contained in the sub-modules can work, the sub-modules are influenced by environment and other factors, if the temperature control of the sub-modules can not be raised to the target temperature, the method can be always executed in the sub-modules, the temperature control requirements of other parts can not be realized, and the whole temperature control system can be in a paralyzed state, so that the good operation of the whole temperature control system can be ensured while the thermal control constant power is ensured, otherwise, the power is pursued stably, and the original purpose of neglecting thermal control is to thermally control each heating part arranged, so that the heat is not compensated;
chinese patent publication No. CN202010125481.4 discloses a satellite power temperature control method, which sets a power target value, then calculates the power sum of a temperature control mechanism after being started, adjusts the start or the stop of the temperature control mechanism by comparing the set rated thermal control power with the actually monitored thermal control power sum in a temperature control period, if the actual power is greater than the set power, the heater with the temperature closest to the set temperature value is closed in the next temperature control period, and if the actual power is less than the set power, the heater with the maximum temperature difference between the temperature and the set temperature is started in the next temperature control period, and the control strategy of the technical scheme mainly has the following disadvantages: the technical scheme only takes the maximum difference term of the temperature of the current temperature measuring point and the set temperature as the heating priority, then the core heating point between the set temperature and the lowest temperature is required to obtain the heating authority again, and the heating authority can be obtained again only when the temperature drops to the set lowest value of the temperature measuring point, but the fluctuation is very large aiming at the temperature time curve of a certain core heating point, and the actual requirements of some heating points can not be met.
Disclosure of Invention
The invention aims to provide an intelligent active thermal control method of a thermal control system based on power and temperature equalization, aiming at the defects of the prior art. The method is based on a current loop thermal control mode of PWM duty ratio regulation, so that the total power does not exceed the set power under the condition of balanced heating of each channel, and the power balance is ensured.
The technical scheme for realizing the purpose of the invention is as follows:
the intelligent active heat control method of the heat control system based on power and temperature equalization comprises the following steps:
1)1) collecting data: the method comprises the steps that a current monitoring device is additionally arranged on 1-N heating channels of a thermal control circuit board and used for collecting 1-N channel currents and calculating 1-N channel power consumption, wherein N is a natural number, the 1 channel power consumption value is W1 …, the N channel power consumption value is Wn, the total thermal control power consumption value is W, N heating loops are additionally arranged on the thermal control circuit board in the prior art, a current detection device is additionally arranged on each heating loop power side, a current monitoring device is additionally arranged on a thermal control bus power supply and used for monitoring the total thermal control current and calculating the total thermal control power consumption, and the real-time electric quantity consumption of each electric device can be obtained;
2) initializing system parameters: instruction cycle t1、t2…tnThat is, the time slice timing of each cycle of the operation period needs to initialize the system parameters before starting up, and the initialization parameters are set by the system preset parameters or the telemetering instructions, including: setting a temperature loop PID value, setting a current loop PID value, and setting a total power threshold value P of a temperature control systemsetSetting the temperature control target value T of each temperature measuring pointset1、Tset2…TsetnSetting heating weight values W of the respective channels1、W2…WnAnd initializing a heating channel flag bit;
3) and (3) judging the opening condition: after the system is started, the temperature sensor monitors the ambient temperature in real time and makes a judgment in each time slice period, and the current temperature Tcurrent1、Tcurrent2…TcurrentnBelow a set temperature Tset1、Tset2…TsetnImmediately judge Tcurrent1≤Tset1、Tcurrent2≤Tset2…Tcurrentn≤TsetnWhether the condition is met or not, if the corresponding temperature acquisition channel meets the judgment condition, executing the step 4), and if the corresponding temperature acquisition channel does not meet the judgment condition, not enabling thermal control;
4) determine heating priority using weight: step 3) after the condition of opening is met, the weights of the heating channels meeting the condition of opening are arranged in a descending order, the first n channels with high priority are selected to be opened for thermal control at the current time slice, the heaters with the same weight are used for judging that the heating channel with the lowest temperature is preferentially heated, and the n channels are selected to be at the tthnThe time slices are started, so as to ensure that the heating channels are not completely started simultaneously to cause instantaneous power sudden change, and therefore the selection requirement of n is related to the capacity of the heating system;
5) starting a first heating mode: if the current heating zone bit of the heating channel is the first heating zone bit, heating to a set temperature value according to rated power;
6) the first heating satisfies the set value: judging whether the first heating sensor enters a set heating temperature value T or notcurrentn≥TsetnIf T iscurrentn＜TsetnHeating is continued if Tcurrentn≥TsetnStep 7) is entered;
7) the heating mark is changed into a heated mark: when the set value is entered, the first heating zone bit is changed into a heated zone bit, the heated zone bit is used as a condition for entering PWM control, and a channel of the heated zone bit does not perform full-power operation before the zone bit is not cleared, and directly enters PWM control;
8) entering a temperature control mode: judging whether the weight of the current heated channel is the highest priority, if so, the heating channel is not influenced by dynamic adjustment PWM, entering an autonomous heating mode, always keeping the set temperature, entering a temperature ring, and otherwise, entering a step 9);
9) entering a PWM temperature control mode: each channel enters PWM duty ratio regulation heating, each channel follows the duty ratio to regulate each channel heating, the total power consumption does not exceed the set total power value, the current loop control is carried out, and the current heating total power P is judged by the current loop controlcurrentWhether or not it is less than the set total power value PsetIf the current heating total power is less than the total power value, the duty ratio is increased, and if the current heating total power is PcurrentGreater than the set total power value PsetThen the duty cycle is reduced;
10) and (3) temperature timing judgment: judging whether the temperature value of each heating channel is greater than a set temperature every n time periods;
11) and (3) exiting heating: if the temperature of the current heated channel is higher than the set temperature value, the heating is stopped, the current heated channel enters a zone to be heated, and the heating mark position is cleared;
12) judging the failure duty ratio: judging whether the PWM duty ratio of the current channel is the lowest PWM duty ratio or not, if the PWM duty ratio is larger than or equal to the lowest PWM duty ratio, continuing to heat the current loop of the heating channel, and if the PWM of the current channel is smaller than or equal to the minimum effective value, withdrawing from heating the current channel, entering into heating to be heated, and clearing a heating mark position;
13) entering idle wait timing: and (4) entering channels entering the to-be-heated area to enter idle timing, timing for m time periods, and simultaneously timing time to judge whether each heating channel is lower than the lowest value of allowable temperature fluctuation, returning to the step 4 if the temperature is the lowest value, and emptying the timer and timing again if the temperature is not the lowest value of allowable temperature.
According to the technical scheme, the spacecraft component is subjected to thermal implementation according to the guidance suggestion of thermal analysis, a plurality of temperature control points are obtained through guidance data obtained through the thermal analysis and are used for subsequent thermal control implementation, and the thermal control points are subjected to weight division according to the relative importance of the thermal control points, for example: the weight of the thermal control point 1 is 1, the weight of the thermal control point 2 is 2, the weight of the thermal control point N is N, the smaller the value of the weight is, the higher the priority in thermal control is, the weight indicated by the technical scheme is not limited to one thermal control point corresponding to one weight, the technical scheme comprises a plurality of thermal control points corresponding to one weight, the weight is originally proposed to be used as the heating priority differentiation of a heating system, but can be expanded to form functional differentiation under different weights, and the functional differentiation is used for adapting to the complex temperature control requirement of a thermal control environment.
In the technical scheme, the heating parts are a film type electric heater, an electric heating belt, an armored heater, a wire-wound resistor, a ceramic-metal integrated heater and the like, the sensor mainly comprises a temperature sensor, such as an NTC thermistor, a PT100 platinum resistor, a PT1000 platinum resistor and the like, and closed-loop feedback control is performed by utilizing temperature data acquired by the temperature sensor and an execution heating mechanism.
In the technical scheme, in order to enable the temperature control actuating mechanism to effectively control the output magnitude of the current, each path of thermal control adopts a PWM (pulse Width modulation) pulse Width modulation method to adjust a duty ratio control signal, the current flowing through the heating mechanism is adjusted by adjusting the duty ratio, and the power of the heating mechanism is controlled by adjusting the magnitude of the current flowing through the heating mechanism.
According to the technical scheme, the acquired real-time temperature data and current data are utilized, and the heating weight value defined by thermal analysis according to the working condition of the equipment is used as the input quantity of the intelligent active thermal control method based on power distribution.
After the thermal control is enabled in the technical scheme, when each temperature measuring point detects that the ambient temperature value is lower than the set thermal control starting threshold Tth1、Tth2…TthnAnd when the temperature of the heating mechanism is detected, the temperature detection data of the temperature measuring point is used as feedback adjustment quantity of the heating mechanisms.
In the technical scheme, the temperature control system can set the PWM control period T of the heating mechanism, and all heating execution mechanisms of the temperature control system are circularly carried out in the PWM heating period, namely T1、T2…TxWherein x is 1,2 …; implementation of the assemblyThe power control and the power control of each channel are realized by adjusting the PWM duty ratio.
In the technical scheme, a total power threshold value P of the temperature control system is setsetSetting a total power threshold value for ensuring the current total power P consumed by the heating mechanism during operationcurrentSetting the temperature control target value T of each temperature measuring point without exceeding the set total power thresholdset1、Tset2…TsetnSetting the target temperature control value of each temperature measuring point to calculate the actual temperature measuring value T of each temperature measuring pointcurrentAnd a target value TsetError E ofcurrentBy means of the error EcurrentRealizing closed-loop control of thermal control channels, and setting heating weight value W of each channel1、W2…WnThe heating execution mechanism can be guided and controlled by reasonably distributing the weight value to each temperature measuring point, and the configuration parameter setting can be preset in advance through system parameters or can be updated and set in real time through a ground-end remote measuring instruction.
In the technical scheme, for a channel which enters heating for the first time, heating can be enabled to be started and operated according to full power, but starting full power heating inevitably leads to increase of heating power of a local terminal, duty ratios of other thermal control channels with low weights are reduced at the moment, similarly, heating points with high weights are not affected, heating is continued according to a set temperature, heating mark positions are marked during first heating, and the first heating defined herein is called as first heating if one heating channel exits heating and the heating mark is cleared, enters heating again and marks the heating mark positions when the heating mark positions are marked.
In the technical scheme, a PWM dynamic regulation mode is entered, the current values of corresponding channels are detected at the same time, and whether the total channel power consumption is higher than a total power threshold value P or not is calculatedsetIf above the total power threshold PsetAdjusting the duty ratio of the channel, and proportionally adjusting the PWM duty ratio according to the internal resistance relation of the heating equipment, namely in order to avoid global heating nonuniformity caused by adjusting the duty ratio of only one heating equipment, according to the self characteristics of the heating equipment, the power calculation formula P is I2R, can be obtained to heat the equipment workThe ratio is related to the current flowing through the heating device and the internal resistance of the heating device itself, which is known as the total resistance R of the heating devicetotalThe heating unit distributing the current according to the heating current in PWM mode
Figure BDA0003432095310000051
Proportional division, e.g. total heating current at rated power ItotalThe average current in the high-authority mode is IaverTotal heating current in PWM mode is IPWM＝Itotal-IaverThe current distributed to each channel in the PWM mode is
Figure BDA0003432095310000052
The heating device is used for heating the heating device in the PWM mode, the average total current reduces the divided current of each path when the heating device in the PWM mode is increased, which causes the duty ratio adjusting heating mechanism to have the condition that when the duty ratio is reduced to a certain value, the heating mechanism does not play a heating role any more, at the moment, the thermal control channel needs to be completely closed, the duty ratio critical value needs to be calibrated in an experiment for different heating mechanisms in an actual time zone, and the closed heating channel enters a meter to be heated.
According to the technical scheme, the total power balance output is realized by accurately controlling the consumed power of each path of heater, the current of each path of heating mechanism is collected, the problem that the power distribution is uneven because the traditional power thermal control simply depends on the total current as the only parameter of the power control is solved, the power consumption of each path of heating mechanism is controlled by adjusting the PWM duty ratio of the heater in real time through a dynamic weight temperature control strategy, the orderliness and pertinence in the temperature control process are improved, and the core heating electricity can be guaranteed to be kept at a constant temperature.
The method is based on a current loop thermal control mode of PWM duty ratio regulation, so that the total power does not exceed the set power under the condition of balanced heating of each channel, and the power balance is ensured.
Drawings
FIG. 1 is a schematic flow chart of an exemplary method.
Detailed Description
The invention will be further elucidated with reference to the drawings and examples, without however being limited thereto,
example (b):
referring to fig. 1, the intelligent active thermal control method of the thermal control system based on power and temperature equalization comprises the following steps:
1) collecting data: the method comprises the steps that a current monitoring device is additionally arranged on 1-N heating channels of a thermal control circuit board and used for collecting 1-N channel currents and calculating 1-N channel power consumption, wherein N is a natural number, the 1 channel power consumption value is W1 …, the N channel power consumption value is Wn, the total thermal control power consumption value is W, N heating loops are additionally arranged on the thermal control circuit board in the prior art, a current detection device is additionally arranged on each heating loop power side, a current monitoring device is additionally arranged on a thermal control bus power supply and used for monitoring the total thermal control current and calculating the total thermal control power consumption, and the real-time electric quantity consumption of each electric device can be obtained;
2) initializing system parameters: instruction cycle t1、t2…tnThat is, the time slice timing of each cycle of the operation period needs to initialize the system parameters before starting up, and the initialization parameters are set by the system preset parameters or the telemetering instructions, including: setting a temperature loop PID value, setting a current loop PID value, and setting a total power threshold value P of a temperature control systemsetSetting the temperature control target value T of each temperature measuring pointset1、Tset2…TsetnSetting heating weight values W of the respective channels1、W2…WnAnd initializing a heating channel flag bit;
3) and (3) judging the opening condition: after the system is started, the temperature sensor monitors the ambient temperature in real time and makes a judgment in each time slice period, and the current temperature Tcurrent1、Tcurrent2…TcurrentnBelow a set temperature Tset1、Tset2…TsetnImmediately judge Tcurrent1≤Tset1、Tcurrent2≤Tset2…Tcurrentn≤TsetnWhether the condition is met or not, if the corresponding temperature acquisition channel meets the judgment condition, executing the step 4), and if the corresponding temperature acquisition channel does not meet the judgment condition, not enabling thermal control;
4) determine heating priority using weight: step 3) after the condition of opening is met, the weights of the heating channels meeting the condition of opening are arranged in a descending order, the first n channels with high priority are selected to be opened for thermal control at the current time slice, the heaters with the same weight are used for judging that the heating channel with the lowest temperature is preferentially heated, and the n channels are selected to be at the tthnThe time slices are started, so as to ensure that the heating channels are not completely started simultaneously to cause instantaneous power sudden change, and therefore the selection requirement of n is related to the capacity of the heating system;
5) starting a first heating mode: if the current heating zone bit of the heating channel is the first heating zone bit, heating to a set temperature value according to rated power;
6) the first heating satisfies the set value: judging whether the first heating sensor enters a set heating temperature value T or notcurrentn≥TsetnIf T iscurrentn＜TsetnHeating is continued if Tcurrentn≥TsetnStep 7) is entered;
7) the heating mark is changed into a heated mark: when the set value is entered, the first heating zone bit is changed into a heated zone bit, the heated zone bit is used as a condition for entering PWM control, and a channel of the heated zone bit does not perform full-power operation before the zone bit is not cleared, and directly enters PWM control;
8) entering a temperature control mode: judging whether the weight of the current heated channel is the highest priority, if so, the heating channel is not influenced by dynamic adjustment PWM, entering an autonomous heating mode, always keeping the set temperature, entering a temperature ring, and otherwise, entering a step 9);
9) entering a PWM temperature control mode: each channel enters PWM duty ratio regulation heating, and each channel is heated by regulating each channel according to the duty ratio, so that the total power consumption is not more than setSetting the total power value, entering current loop control, and judging the total current heating power P by the current loop controlcurrentWhether or not it is less than the set total power value PsetIf the current heating total power is less than the total power value, the duty ratio is increased, and if the current heating total power is PcurrentGreater than the set total power value PsetThen the duty cycle is reduced;
10) and (3) temperature timing judgment: judging whether the temperature value of each heating channel is greater than a set temperature every n time periods;
11) and (3) exiting heating: if the temperature of the current heated channel is higher than the set temperature value, the heating is stopped, the current heated channel enters a zone to be heated, and the heating mark position is cleared;
12) judging the failure duty ratio: judging whether the PWM duty ratio of the current channel is the lowest PWM duty ratio or not, if the PWM duty ratio is larger than or equal to the lowest PWM duty ratio, continuing to heat the current loop of the heating channel, and if the PWM of the current channel is smaller than or equal to the minimum effective value, withdrawing from heating the current channel, entering into heating to be heated, and clearing a heating mark position;
13) entering idle wait timing: and (4) entering channels entering the to-be-heated area to enter idle timing, timing for m time periods, and simultaneously timing time to judge whether each heating channel is lower than the lowest value of allowable temperature fluctuation, returning to the step 4 if the temperature is the lowest value, and emptying the timer and timing again if the temperature is not the lowest value of allowable temperature.
In this example, a spacecraft component is thermally implemented according to guidance suggestions of thermal analysis, a plurality of temperature control points are obtained for subsequent thermal control implementation through guidance data obtained by the thermal analysis, and each thermal control point is subjected to weight division according to the relative importance of the thermal control point, for example: the weight of the thermal control point 1 is 1, the weight of the thermal control point 2 is 2, the weight of the thermal control point N is N, the smaller the value of the weight is, the higher the priority in thermal control is, the weight indicated by the technical scheme is not limited to one thermal control point corresponding to one weight, the technical scheme comprises a plurality of thermal control points corresponding to one weight, the weight is originally proposed to be used as the heating priority differentiation of a heating system, but can be expanded to form functional differentiation under different weights, and the functional differentiation is used for adapting to the complex temperature control requirement of a thermal control environment.
In this example, the heating component is a thin film electric heater, an electric heating belt, an armored heater, a wire-wound resistor, a ceramic-metal integrated heater, etc., the sensor mainly comprises a temperature sensor, such as an NTC thermistor, a PT100 platinum resistor, a PT1000 platinum resistor, etc., and closed-loop feedback control is performed by using temperature data acquired by the temperature sensor and the execution heating mechanism.
In the embodiment, in order to enable the temperature control actuating mechanism to effectively control the output magnitude of the current, each path of thermal control adopts a Pulse Width Modulation (PWM) method to adjust a duty ratio control signal, the current flowing through the heating mechanism is adjusted by adjusting the duty ratio, and the power of the heating mechanism is controlled by adjusting the magnitude of the current flowing through the heating mechanism.
The collected real-time temperature data and current data are utilized in this example, as well as thermal analysis of heating weight values defined according to plant operating conditions as an input to an intelligent active thermal control method based on power distribution.
In this example, after the thermal control is enabled, when each temperature measuring point detects that the ambient temperature value is lower than the set thermal control start threshold value Tth1、Tth2…TthnAnd when the temperature of the heating mechanism is detected, the temperature detection data of the temperature measuring point is used as feedback adjustment quantity of the heating mechanisms.
In this example, the implementation of the temperature control system will set the PWM control period T of the heating mechanism, and all the heating execution mechanisms of the temperature control system will be operated in the PWM heating period, i.e. T1、T2…TxWherein x is 1,2 …; the total power control and the power control of each channel are realized by adjusting the PWM duty ratio.
In this example, a total power threshold P of the temperature control system is setsetSetting a total power threshold value for ensuring the current total power P consumed by the heating mechanism during operationcurrentSetting the temperature control target value T of each temperature measuring point without exceeding the set total power thresholdset1、Tset2…TsetnSetting the target temperature control value of each temperature measuring point to calculate the actual temperature measuring value T of each temperature measuring pointcurrentAnd a target value TsetError E ofcurrentBy means of the error EcurrentRealizing closed-loop control of thermal control channels, and setting heating weight value W of each channel1、W2…WnThe heating execution mechanism can be guided and controlled by reasonably distributing the weight value to each temperature measuring point, and the configuration parameter setting can be preset in advance through system parameters or can be updated and set in real time through a ground-end remote measuring instruction.
In this example, for a channel entering heating for the first time, enabling heating to be started and running according to full power, but starting full power heating will inevitably result in increase of local heating power, at this time, duty ratios of other thermal control channels with low weights should be reduced, similarly, heating points with high weights are not affected, heating continues according to a set temperature, heating mark bits should be marked for the first heating, and it is noted that the first heating defined herein is relative to exiting heating, if one heating channel exits heating, the heating mark is cleared, then entering heating again, and marking the heating mark bits is called as first heating.
In this example, a PWM dynamic regulation mode is entered, and the current values of the corresponding channels are detected to calculate whether the total channel power consumption is higher than the total power threshold value PsetIf above the total power threshold PsetAdjusting the duty ratio of the channel, and proportionally adjusting the PWM duty ratio according to the internal resistance relation of the heating equipment, namely in order to avoid global heating nonuniformity caused by adjusting the duty ratio of only one heating equipment, according to the self characteristics of the heating equipment, the power calculation formula P is I2R, it can be concluded that the heating installation power is related to the current flowing through the heating installation and the internal resistance of the heating installation itself, given that the total resistance of the heating installation is RtotalThe heating unit distributing the current according to the heating current in PWM mode
Figure BDA0003432095310000081
Proportional division, e.g. total heating current at rated power ItotalIn high privilege modeHas an average current of IaverTotal heating current in PWM mode is IPWM＝Itotal-IaverThe current distributed to each channel in the PWM mode is
Figure BDA0003432095310000082
The heating device is used for heating the heating device in the PWM mode, the average total current reduces the divided current of each path when the heating device in the PWM mode is increased, which causes the duty ratio adjusting heating mechanism to have the condition that when the duty ratio is reduced to a certain value, the heating mechanism does not play a heating role any more, at the moment, the thermal control channel needs to be completely closed, the duty ratio critical value needs to be calibrated in an experiment for different heating mechanisms in an actual time zone, and the closed heating channel enters a meter to be heated.

Claims (1)

1. The intelligent active heat control method of the heat control system based on power and temperature equalization is characterized by comprising the following steps of:
1) collecting data: the method comprises the steps that a current monitoring device is additionally arranged on 1-N heating channels of a thermal control circuit board and used for collecting 1-N channel currents and calculating 1-N channel power consumption, wherein N is a natural number, the 1 channel power consumption value is W1 …, the N channel power consumption value is Wn, and the thermal control total power consumption value is W;
2) initialization: instruction cycle t1、t2…tnThat is, the time slice timing of each cycle of the operation period needs to initialize the system parameters before starting up, and the initialization parameters are set by the system preset parameters or the telemetering instructions, including: setting a temperature loop PID value, setting a current loop PID value, and setting a total power threshold value P of a temperature control systemsetSetting the temperature control target value T of each temperature measuring pointset1、Tset2…TsetnSetting heating weight values W of the respective channels1、W2…WnAnd initializing a heating channel flag bit；
3) And (3) judging the opening condition: after the system is started, the temperature sensor monitors the ambient temperature in real time and makes a judgment in each time slice period, and the current temperature Tcurrent1、Tcurrent2…TcurrentnBelow a set temperature Tset1、Tset2…TsetnImmediately judge Tcurrent1≤Tset1、Tcurrent2≤Tset2…Tcurrentn≤TsetnWhether the condition is met or not, if the corresponding temperature acquisition channel meets the judgment condition, executing the step 4), and if the corresponding temperature acquisition channel does not meet the judgment condition, not enabling thermal control;
4) sorting: step 3) after the condition of opening is met, further performing descending order arrangement on the weights of the heating channels meeting the condition of opening, starting thermal control on the first n channels with high priority level in the current time slice, and judging that the heating channel with the lowest temperature is preferentially heated by using a heater with the same weight;
5) starting a first heating mode: if the current heating zone bit of the heating channel is the first heating zone bit, heating to a set temperature value according to rated power;
6) the first heating satisfies the set value: judging whether the first heating sensor enters a set heating temperature value T or notcurrentn≥TsetnIf T iscurrentn＜TsetnHeating is continued if Tcurrentn≥TsetnStep 7) is entered;
7) the heating mark is changed into a heated mark: when the set value is entered, the first heating zone bit is changed into a heated zone bit, the heated zone bit is used as a condition for entering PWM control, and a channel of the heated zone bit does not perform full-power operation before the zone bit is not cleared, and directly enters PWM control;
8) entering a temperature control mode: judging whether the weight of the heating channel which is enabled to be heated at present is the highest priority, if so, the heating channel is not influenced by dynamic adjustment PWM, entering an autonomous heating mode, always keeping the set temperature, entering a temperature ring, and otherwise, entering a step 9);
9) entering a PWM temperature control mode: each channel entersPWM duty ratio regulation heating, each channel is regulated to heat according to the duty ratio, the total power consumption is enabled not to exceed the set total power value, the current loop control is carried out, and the current heating total power P is judged by the current loop controlcurrentWhether or not it is less than the set total power value PsetIf the current heating total power is less than the total power value, the duty ratio is increased, and if the current heating total power is PcurrentGreater than the set total power value PsetThen the duty cycle is reduced;
10) and (3) temperature timing judgment: judging whether the temperature value of each heating channel is greater than a set temperature every n time periods;
11) and (3) exiting heating: if the current enabled heating temperature is higher than the set temperature value, the heating is stopped, the heating enters a zone to be heated, and the heating mark position is cleared;
12) judging the failure duty ratio: judging whether the PWM duty ratio of the current channel is the lowest PWM duty ratio or not, if the PWM duty ratio is larger than or equal to the lowest PWM duty ratio, continuing to heat the current loop of the heating channel, and if the PWM of the current channel is smaller than or equal to the minimum effective value, withdrawing from heating the current channel, entering into heating to be heated, and clearing a heating mark position;
13) entering idle wait timing: and (4) entering channels entering the to-be-heated area to enter idle timing, timing for m time periods, and simultaneously timing time to judge whether each heating channel is lower than the lowest value of allowable temperature fluctuation, returning to the step 4 if the temperature is the lowest value, and emptying the timer and timing again if the temperature is not the lowest value of allowable temperature.
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