CN103235611A - Control method and controller for proportion integration differentiation (PID) control-based breathing machine heating and humidifying system - Google Patents
Control method and controller for proportion integration differentiation (PID) control-based breathing machine heating and humidifying system Download PDFInfo
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Abstract
The invention discloses a control method and a controller for a proportion integration differentiation (PID) control-based breathing machine heating and humidifying system and relates to a control method and a controller for the breathing machine heating and humidifying system. The invention comprises a step and a device for acquiring a real-time temperature value, a step and a device for obtaining a temperature departure value, a step and a device for carrying out PID calculations and a step and a device for outputting a PID calculating result to control heating. According to the control method disclosed by the invention, the heating temperature is controlled by adopting an improved PID control method, and the heating can be continuously performed by adding an external execution cycle, so that the heating efficiency is improved. Meanwhile, by the setting of the external execution cycle, the control precision can be improved, and the heating thermal inertia is prevented from being excessively high. An integration operation link is conditionally executed, so that the temperature control reaction is sensitive, the temperature control is stable, safe and reliable, and the operation is simple.
Description
Technical field
The present invention relates to a kind of lung ventilator heat humidification system control method and controller, be specifically related to a kind of lung ventilator based on PID control heat humidification system control method and controller.This method is finished by computer program instructions control computer system by setting up functional module construction.
Background technology
PID(Proportion Integration Differentiation) the existing about 70 years history of control, nowadays still be widely used in the Industry Control, traditional PID control is that the setting value r (t) according to certain variable constitutes control deviation e (t) with real output value y (t), be e (t)=r (t)-y (t), deviation e (t) is carried out ratio, integration respectively and differentiates, then with the results added of computing, just obtain the control output u (t) of PID controller, control system makes it draw close toward setting value r (t) according to u (t) to this variable adjustment.The PID control principle is easily understood, and is widely used.
For comfortable breathing environment is provided to patient, avoid the gas of dry cold to the damage of respiratory tract and lungs, when using respirator treatment, must carry out humidifying, temperatureization to sucking gas.Nowadays the method for Chang Yong two kinds of humidifyings of heating has: the one, and atomizing humidifying performance; The one, steam humidification.Wherein steam humidification is to produce steam after water is heated, infiltrate to suck in the gas, thus the dual purpose that reaches humidification, heats.The lung ventilator of the existing employing steam humidification humidification system of heating, temperature control is slow in reacting, simultaneously because the temperature of heating can be subjected to the influence of factors such as room temperature, airway length and temperature-controlling system imbalance, cause temperature drift or on the low side easily, the temperature control instability, the temperature instability produces very big harmful effect to the patient, even the burn respiratory tract.
Summary of the invention
The objective of the invention is provides a kind of temperature control to be quick on the draw at above-mentioned deficiency of the prior art, the stable lung ventilator based on PID control of temperature control heat humidification system control method and controller.
Purpose of the present invention is achieved through the following technical solutions:
Based on the lung ventilator of the PID control humidification system control method of heating, comprising:
Steps A. gather the real time temperature value;
Step B. deducts described real time temperature with set temperature value is worth the temperature deviation value;
Step C. carries out the PID computing to described temperature deviation value and gets with the immediate integer of described PID operation result being the control output valve that described PID computing continues to carry out and the described control output valve of real-time update;
Step D. heats, set the outside performance period, the control output valve that draws among the step C is the number of times of heating in this outside performance period, after the each renewal of described control output valve, control output valve after all will upgrading and the number of times of having heated in this outside performance period compare, if the control output valve after upgrading then continues to heat, otherwise stops to heat greater than the number of times of having heated in this outside performance period.
Further, design temperature deviation integration threshold value, if described temperature deviation value is greater than the temperature deviation integral threshold, just value, the value that integral operation draws and the value addition that draws of differentiating that the scale operation of PID computing among the step C is drawn draws the control output valve, if described temperature deviation value is less than the temperature deviation integral threshold, just the scale operation value that draws and the value addition that draws of differentiating with PID computing among the step C draws the control output valve.
Further, be provided with temperature control and carry out scope, and: if the temperature deviation value is in described temperature control execution scope, with regard to execution in step C and step D; If the temperature deviation value is carried out the lower limit of scope less than described temperature control, with regard to not execution in step C and step D and do not heat; If the temperature deviation value is carried out the upper limit of scope greater than described temperature control, with regard to not execution in step C and step D and continue to heat.
Wherein, it is asymmetric that described temperature control is carried out scope relative coordinate initial point in coordinate axis.
Beneficial effect of the present invention: control method of the present invention adopts improved PID control method to control the temperature of heating, the outside performance period of adding can make to heat carries out continuously, improves the efficient of heating, and passes through the setting of outside performance period simultaneously, can improve control accuracy, the thermal inertia that prevents from heating is too big; The integral operation link is carried out conditionally, can make that temperature control is quick on the draw, temperature control is stable, safe and reliable, simple to operate.
Embodiment
The present invention is described in detail below in conjunction with embodiment.
Lung ventilator based on PID control of the present invention heat humidification system control method and controller, be applied in the lung ventilator of steam humidification, in described control method, introduce improved PID control the temperature of heating is controlled, make temperature can be stabilized in design temperature rapidly.
The described humidification system of heating comprises power circuit, the PID control circuit, zero cross detection circuit and add circuit temperature, add circuit temperature and comprise heating apparatus, the PID control circuit comprises processor and temperature sensor, zero cross detection circuit obtains crossover point signal from alternating current, again described crossover point signal is transferred to the PID control circuit, temperature sensor is transferred to processor after gathering the real time temperature of heating apparatus and described real time temperature being converted to the real time temperature signal, the PID control circuit carries out the PID computing according to described real time temperature signal, and the PID control circuit produces after the trigger pip of heating the described trigger pip of heating is transferred to according to described PID operation result and adds circuit temperature.The effect of power circuit is that the 5V DC voltage is converted to 3.3V and provides reference voltage V REF+ for AD changes; Mainly acting as the real time temperature of gathering heating apparatus and carrying out the PID computing of PID control circuit produces the trigger pip control of the heating circuit working of heating; The effect of zero cross detection circuit is to obtain crossover point signal from alternating current; The effect that adds circuit temperature is to heat after the PID control circuit obtains to heat trigger pip.
The described humidification system of heating comprises that also address decoding circuitry, display interface circuit, serial port circuit, JTAG debug i/f circuit and five are to distant bar circuit, address decoding circuitry, serial port circuit, JTAG debug i/f circuit are connected with power circuit, PID control circuit respectively to distant bar circuit with five, and display interface circuit is connected with address decoding circuitry, PID control circuit.The effect of address decoding is the I/O mouth of expanding processor; The effect of display interface circuit is to connect display screen, to show real time temperature and design temperature; The effect of serial port circuit is that the described humidification system of heating can be communicated with host computer; The JTAG debug i/f circuit is used for ARM emulator programming firmware and downloads debugged program; Five are used for design temperature, manual adjustments pid parameter and switch display interface to distant bar circuit.
The course of work of humidification system of heating lung ventilator based on PID control of the present invention sees the heat control method of humidifying of the following lung ventilator based on PID control for details.
Steps A: gather the real time temperature value, temperature sensor is gathered the real time temperature of heating apparatus, and described real time temperature is converted to the real time temperature signal, and then described real time temperature signal being transferred to processor, processor is converted to the real time temperature value with described real time temperature signal.
Step B: processor deducts described real time temperature with the set temperature value of heating apparatus is worth the temperature deviation value.
Step C:PID control circuit carries out the PID computing to described temperature deviation value and gets with the immediate integer of described PID operation result being the control output valve that described PID computing continues to carry out and the described control output valve of real-time update.Because the integral operation in the PID computing is mainly used in eliminating static difference, when the temperature deviation value is very little, add that in control value that integral operation draws can allow the slow in reacting of the described humidification system of heating on the contrary in the output valve, present embodiment is provided with the temperature deviation integral threshold for this reason, if described temperature deviation value is greater than the temperature deviation integral threshold, the value that the scale operation in the described PID computing is drawn just, the value that integral operation draws and the value addition that draws of differentiating draw the control output valve, if described temperature deviation value is less than the temperature deviation threshold value, just the value that the scale operation in the described PID computing is drawn and the value addition that draws of differentiating draw the control output valve, in the present embodiment, design temperature deviation integration threshold value is 0.5, do not add that less than 0.5 o'clock control output valve value that integral operation draws can allow being quick on the draw of humidification system of heating in the temperature deviation value, temperature control is stable.In the humidification system of heating of present embodiment, processor is the STM32F103ZET6 chip, and it is 239.5 cycles that the AD sampling time is set, and namely the PID sampling period is 30us, that is to say that every 30us will upgrade once to control output valve.
Step D:PID control circuit is heated according to PID operation result control heating apparatus.Because the PID computing that the PID control circuit carries out is too frequent, and heating apparatus needs the continuous heating-up time, switching warm-up mode too frequently can not allow heating apparatus work effectively, therefore the PID control circuit is provided with the outside performance period, to control the number of times that heating apparatus is heated continuously in the outside performance period.In the present embodiment, zero cross detection circuit obtains crossover point signal from alternating current, again described crossover point signal is transferred to the PID control circuit, the quantity of the external interrupt of processor record crossover point signal in the PID control circuit, setting is an outside performance period with N crossover point signal, wherein N is positive integer, setting N in the present embodiment is 100, described external interrupt is from the quantity of 1～N cycle index crossover point signal, particularly, the humidification system of heating at present embodiment, processor is the STM32F103ZET6 chip, the voltage of China's alternating current and frequency are 220V/50Hz, cycle is 20ms, zero cross detection circuit comprises rectifier bridge DB107, alternating current is through after the rectifier bridge DB107, minus phase changes, cycle becomes 10ms, so the crossover point signal cycle that zero cross detection circuit takes out is 10ms, zero cross detection circuit is transferred to described crossover point signal the external interrupt of processor, the quantity of external interrupt record crossover point signal, it is an outside performance period that 1s is set, then the time of 100 crossover point signal of external interrupt record is an outside performance period.In each outside performance period, the PID control circuit produces the trigger pip control heating apparatus of heating according to the low level of crossover point signal and heats, the control output valve that draws among the step C is the number of the trigger pip of heating that the PID control circuit need produce in this outside performance period, the PID control circuit records the number of the trigger pip of heating that has produced in each outside performance period, after the each renewal of control output valve, the number of the control output valve after all will upgrading and the trigger pip of heating that produced in this outside performance period compares, if the control output valve after upgrading is greater than the number of the trigger pip of heating that has produced in this outside performance period, then continue producing the trigger pip control heating apparatus of heating heats continuously, control output valve after upgrading is equal to or less than the number of the trigger pip of heating that has produced, just no longer produce in this outside performance period of this moment and heated trigger pip, when reaching N to the crossover point signal of external interrupt record, this outside performance period finishes, the next outside performance period begins, the number zero clearing of the trigger pip of heating that a last outside performance period of PID control circuit record has produced, the PID control circuit repeats the operation of an outside performance period.In each outside performance period, the PID control circuit continues to produce the trigger pip of heating, the number that control output valve after upgrading is equal to or less than the trigger pip of heating that has produced just can stop to produce, therefore in each outside performance period, the time of heating has been concentrated in the front of outside performance period, and heating apparatus has obtained continuous warm-up time in each outside performance period.The setting of the length of outside performance period, according to the characteristic of heating arrangement, for the slow heating apparatus of quick heating cooling, the outside performance period of setting is just short, and the excessive temperature fall time that causes of the inertia that prevents from heating lengthens.
Further, be provided with temperature control and carry out scope, and: if the temperature deviation value is in described temperature control execution scope, with regard to execution in step C and step D; If the temperature deviation value is carried out the lower limit of scope less than described temperature control, with regard to not execution in step C and step D and add circuit temperature and do not heat; If the temperature deviation value is carried out the upper limit of scope greater than described temperature control, with regard to not execution in step C and step D and add circuit temperature and continue to heat.Can allow heating apparatus do the work by snatches owing to carry out PID control, when the temperature deviation value is big, in order to reduce the temperature deviation value more rapidly, just do not carry out PID control, and allow heating apparatus work constantly or not work, particularly, if real time temperature is during much smaller than design temperature, just allow the heating apparatus continuous firing, if real time temperature during much larger than design temperature, just allows heating apparatus continue not work.It is asymmetric that described temperature control is carried out scope relative coordinate initial point in coordinate axis, the setting of temperature control execution scope will be in conjunction with the characteristics of heating apparatus, if heating apparatus has the slow characteristics of quick heating cooling, temperature control then is set carries out the mid point deflection positive axis of scope, otherwise the negative semiaxis of mid point deflection that temperature control is carried out scope is set then, in the present embodiment, setting temperature control execution scope is [1,5].
Lung ventilator based on the PID control of the present invention humidification system of heating uses above-mentionedly through improved PID control method, and the temperature stabilization that can control heating apparatus rapidly is quick on the draw at design temperature, and temperature control is stable.
The method that this paper provides, all or part of step wherein can be finished by computer program instructions control computer system by setting up functional module construction.These computer program instructions are stored in the computer-readable recording medium.
Should be noted that at last; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although with reference to preferred embodiment the present invention has been done to explain; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention, and not break away from essence and the scope of technical solution of the present invention.
Claims (8)
1. based on the lung ventilator of the PID control humidification system control method of heating, comprising:
Steps A: gather the real time temperature value;
Step B: deducting described real time temperature with set temperature value is worth the temperature deviation value;
It is characterized by described control method also comprises:
Step C: described temperature deviation value is carried out the PID computing and get with the immediate integer of described PID operation result being the control output valve described PID computing continues to carry out and the described control output valve of real-time update;
Step D: heat, set the outside performance period, the control output valve that draws among the step C is the number of times of heating in this outside performance period, after the each renewal of described control output valve, control output valve after all will upgrading and the number of times of having heated in this outside performance period compare, if the control output valve after upgrading then continues to heat, otherwise stops to heat greater than the number of times of having heated in this outside performance period.
2. the lung ventilator based on the PID control according to claim 1 humidification system control method of heating, it is characterized by, design temperature deviation integration threshold value, if described temperature deviation value is greater than the temperature deviation integral threshold, just value, the value that integral operation draws and the value addition that draws of differentiating that the scale operation of PID computing among the step C is drawn draws the control output valve, if described temperature deviation value is less than the temperature deviation integral threshold, just the scale operation value that draws and the value addition that draws of differentiating with PID computing among the step C draws the control output valve.
3. the lung ventilator based on the PID control according to claim 1 humidification system control method of heating is characterized by, and be provided with temperature control and carry out scope, and: if the temperature deviation value is in described temperature control execution scope, with regard to execution in step C and step D; If the temperature deviation value is carried out the lower limit of scope less than described temperature control, with regard to not execution in step C and step D and do not heat; If the temperature deviation value is carried out the upper limit of scope greater than described temperature control, with regard to not execution in step C and step D and continue to heat.
4. the lung ventilator based on the PID control according to claim 3 humidification system control method of heating is characterized by, and it is asymmetric that described temperature control is carried out scope relative coordinate initial point in coordinate axis.
5. based on the lung ventilator of the PID control humidification system controller of heating, comprise
Device A: be used for gathering the real time temperature value;
Device B: be used for deducting described real time temperature with set temperature value and be worth the temperature deviation value;
It is characterized by described controller also comprises:
Device C: be used for described temperature deviation value being carried out the PID computing and get with the immediate integer of described PID operation result being the control output valve described PID computing continues to carry out and the described control output valve of real-time update;
Device D: be used for heating, set the outside performance period, the control output valve that draws among the device C is the number of times of heating in this outside performance period, after the each renewal of described control output valve, control output valve after all will upgrading and the number of times of having heated in this outside performance period compare, if the control output valve after upgrading then continues to heat, otherwise stops to heat greater than the number of times of having heated in this outside performance period.
6. the lung ventilator based on the PID control according to claim 5 humidification system controller of heating, it is characterized by, described controller also comprises device E, device E is used for design temperature deviation integration threshold value, if described temperature deviation value is greater than the temperature deviation integral threshold, just will install the value that the scale operation of PID computing among the C draws, the value that integral operation draws and the value addition that draws of differentiating draw the control output valve, the value that draws and the value addition that draws of differentiating draw the control output valve if described temperature deviation value, just will be installed the scale operation of PID computing among the C less than the temperature deviation integral threshold.
7. the lung ventilator based on the PID control according to claim 5 humidification system controller of heating, it is characterized by, described controller also comprises device F, and device F is provided with temperature control and carries out scope, and: if the temperature deviation value is in described temperature control execution scope, with regard to running gear C and device D; If the temperature deviation value is carried out the lower limit of scope less than described temperature control, running gear C and install D and do not heat not just; If the temperature deviation value is carried out the upper limit of scope greater than described temperature control, running gear C and install D and continue to heat not just.
8. the lung ventilator based on the PID control according to claim 7 humidification system controller of heating is characterized by, and it is asymmetric that described temperature control is carried out scope relative coordinate initial point in coordinate axis.
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| CN104298282A (en) * | 2014-10-23 | 2015-01-21 | 四川新健康成生物股份有限公司 | Method for accurately controlling temperature of fully automatic biochemical analyzer |
| CN105955369A (en) * | 2016-06-20 | 2016-09-21 | 福州台江区超人电子有限公司 | Agricultural greenhouse climate control system |
| CN106814605A (en) * | 2017-03-28 | 2017-06-09 | 成都天奥电子股份有限公司 | A kind of insulating box temperature control algorithm estimated based on sliding window |
| CN107942736A (en) * | 2016-10-12 | 2018-04-20 | 佛山市顺德区美的电热电器制造有限公司 | A kind of control method, main control device and zero-crossing detection circuit |
| CN108255079A (en) * | 2016-12-29 | 2018-07-06 | 广东美的生活电器制造有限公司 | Household electrical appliance, attaching plug electric discharge device and its control method |
| CN109542139A (en) * | 2018-12-29 | 2019-03-29 | 陕西宝成航空仪表有限责任公司 | Fast precise temperature control device and its implementation |
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| CN104298282B (en) * | 2014-10-23 | 2016-08-24 | 四川新健康成生物股份有限公司 | A kind of method being precisely controlled for automatic clinical chemistry analyzer temperature |
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| CN106814605A (en) * | 2017-03-28 | 2017-06-09 | 成都天奥电子股份有限公司 | A kind of insulating box temperature control algorithm estimated based on sliding window |
| CN106814605B (en) * | 2017-03-28 | 2019-10-25 | 成都天奥电子股份有限公司 | A kind of insulating box temperature control algorithm estimated based on sliding window |
| CN109542139A (en) * | 2018-12-29 | 2019-03-29 | 陕西宝成航空仪表有限责任公司 | Fast precise temperature control device and its implementation |
| CN110196553A (en) * | 2019-06-05 | 2019-09-03 | 江苏拓米洛环境试验设备有限公司 | Chamber with dynamic heat load runs control method and device when high temperature and humidity |
| CN110196553B (en) * | 2019-06-05 | 2022-02-18 | 江苏拓米洛环境试验设备有限公司 | Control method and device for high-temperature and high-humidity running of test box with dynamic thermal load |
| CN116672562A (en) * | 2023-06-29 | 2023-09-01 | 湖南比扬医疗科技有限公司 | Breathing machine humidification tank control method and device, electronic equipment and storage medium |
| CN116672562B (en) * | 2023-06-29 | 2024-04-19 | 湖南比扬医疗科技有限公司 | Breathing machine humidification tank control method and device, electronic equipment and storage medium |
| CN116500903A (en) * | 2023-06-30 | 2023-07-28 | 苏州鱼跃医疗科技有限公司 | Breathing machine heating and humidifying control method and system based on artificial intelligence and breathing machine |
| CN116500903B (en) * | 2023-06-30 | 2023-10-31 | 江苏鱼跃医疗设备股份有限公司 | Breathing machine heating and humidifying control method and system based on artificial intelligence and breathing machine |
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