A rapid temperature changing tracking control system in air-cooled thermal environment and a control method thereof

Abstract

The present application relates to a kind of air cooling-thermal environment fast temperature change tracking control system and control method thereof, belong to temperature control technical field, the control system of the present application is equipped with temperature control target setting module and temperature display module, without changing temperature controller can be applied in different temperature regulation scene, realize the control of different air cooling-thermal environment temperature variation requirement, can control heating and cooling process temperature change rate, realize the accurate tracking of target temperature fast change curve, meet the requirement of air-cold thermal environment temperature variation for the scientific research of aeroengine strong transient environment, simultaneously, using closed-loop control system, two-way actuator is adjusted actuating capacity according to the same feedback signal of temperature control effect in real time, and can intelligent shutdown power-off to ensure safety, both simple operation and low cost.

Description

Technical Field

[0001] This invention relates to the field of temperature control technology, specifically to a rapid temperature change tracking control system and its control method under air-cooled-hot environments. Background Technology

[0002] With the continuous development of modern aero engines, the working environment of hot-end components is becoming increasingly harsh, subjecting them to increasingly severe tests. One of the main research directions for future advanced engines is the variable cycle engine, whose mode switching process will lead to a strong transient thermal environment, posing a significant challenge to the safety of high-temperature structures. Reproducing the extreme strong transient thermal environment under near-service conditions in the laboratory is a necessary prerequisite for conducting thermomechanical fatigue damage research, and is of great significance to engine design and development.

[0003] The switching process of variable cycle engine modes inevitably causes strong transient temperature change rates exceeding 80 K / s, nearly four times higher than that of conventional fourth-generation aircraft. The extreme strong transient thermal environment under near-service conditions places different requirements on the temperature of the laboratory air-cooled / heated environment compared to common isothermal maintenance. Instead, it requires specific requirements on the target temperature change waveform. Therefore, it is necessary to control the temperature change device to achieve rapid and accurate temperature change according to the specified target curve, i.e., rapid temperature change tracking. Currently, there is limited research on experimental technology for rapid temperature change control in air-cooled / heated environments both domestically and internationally, and experimental control devices for strong transient thermal environments are lacking. The general temperature change control level is below 10 K / s, which cannot meet the temperature change requirements of aero-engines in strong transient air-cooled / heated environments.

[0004] Most existing temperature control systems maintain the temperature near a constant target value or control the temperature change from one constant target value to the next. Their control precision is limited to maintaining a constant temperature, but they lack real-time control over the rate of temperature change during heating and cooling. Furthermore, most systems only control heating or cooling, controlling the device's start and stop based solely on trigger signals when the upper or lower limits of the set temperature range are reached. They cannot adjust the rate of temperature change in real time based on temperature differences, and therefore lack a closed-loop feedback system. Additionally, most existing temperature controllers are integrated components within electronic systems, making settings modification and display / storage inconvenient. Summary of the Invention

[0005] In view of the above problems, the present invention provides a rapid temperature change tracking control system and control method for air-cooled-heated environments, which can control the temperature change rate of the heating and cooling process, realize accurate tracking of the rapid temperature change curve of the target, and meet the requirements of aero-engine strong transient environment scientific research on temperature changes in air-cooled-heated environments.

[0006] One objective of this invention is to provide a rapid temperature change tracking control system for air-cooled and hot environments, specifically relating to an Arduino-based rapid temperature change tracking control system for air-cooled and hot environments, comprising: a setting unit 1, a sensor module 2, a control unit 3, a temperature adjustment unit 4, and a power supply module 5;

[0007] The control unit calculates the received temperature information to obtain the corresponding control signal; the temperature adjustment unit obtains the corresponding temperature control effect based on the control signal, and simultaneously feeds it back to the control unit to form a closed-loop feedback, thus obtaining the next control signal.

[0008] The control unit includes a clock module 301, a control module 302, and a tuning module 303; the clock module and the tuning module are integrated on the control module; the control module controls and coordinates the operation of the entire system.

[0009] The clock module is used to unify the sampling time and the time corresponding to the target temperature; the tuning module is used to tune the accuracy of the control parameters of the Arduino controller on the open-source electronic development board, and to obtain the proportional control coefficient, integral control coefficient and derivative control coefficient of the controller.

[0010] Preferably, the control module uses an open-source electronic development board Arduino controller, and the clock module and tuning module are integrated on the open-source electronic development board Arduino controller.

[0011] The technical solution of this invention uses an open-source electronic development board Arduino controller to handle data processing and transmission functions. It includes multiple input and output interfaces and is relatively small in size.

[0012] The setting unit includes an input setting module 101, a communication module 102, and a display module 103; the output terminal of the input setting module is connected to the input terminal of the communication module, the output terminal of the communication module is connected to the input terminal of the display module, and the output terminal of the display module is connected to the input terminal of the open-source electronic development board Arduino controller.

[0013] The technical solution of this invention connects the display module with the open-source electronic development board Arduino controller. That is, the open-source electronic development board Arduino controller is connected with the setting unit, forming a setting-display-transmission interactive system in the setting unit. This system is intuitive, easy to modify and store, and has low cost.

[0014] The sensor module is a temperature sensor; the output terminals of the power module and the sensor module are respectively connected to the input terminal of the control unit.

[0015] The sensor module of this invention uses a temperature sensor to detect the temperature of the controlled object in real time.

[0016] The temperature regulation unit includes a relay module 401, a heating module 402, a cooling module 403, and a safety power-off module 404; the input terminals of the heating module and the cooling module are connected to the output terminal of the relay module; the output terminals of the heating module and the cooling module are connected to the input terminal of the sensor module.

[0017] The output of the Arduino controller on the open-source electronic development board is connected to the input of the safety power-off module and the relay module, respectively.

[0018] Another objective of this invention is to provide a control method for a rapid temperature change tracking control system under air-cooled / heated conditions, specifically relating to a control method for a rapid temperature change tracking control system under air-cooled / heated conditions based on Arduino, comprising:

[0019] Connect the power module for rapid temperature tracking under air-cooled and hot environments, initialize the control system, and obtain the initialized control system.

[0020] In the initialized control system, preset temperature parameters are input to obtain the target temperature change curve; the temperature parameters include: initial temperature, final temperature, temperature change time, temperature hold time, and temperature change rate, such as... Figure 2 As shown; the target temperature change curve is a temperature function curve, which can be a polygonal line, a trapezoidal wave, or a parabola;

[0021] The target temperature change curve is input into the open-source electronic development board Arduino controller through the communication module to obtain the temperature control target of the control system; the temperature control target includes: the temperature change rate and the temperature change range.

[0022] Establish the transfer function for the tuning module;

[0023] The open-source electronic development board Arduino controller tunes the controller parameters according to the transfer function of the tuning module, obtaining the proportional control coefficient, integral control coefficient, and derivative control coefficient of the controller; the parameters include: the proportional gain, integral time, and derivative time of the controller;

[0024] Turn on the control switch of the control system;

[0025] The clock module is set to collect T sampling times for temperature, and the target temperature corresponding to the t-th sampling time is obtained. At the same time, the temperature sensor is used to collect the real-time temperature of the controlled object corresponding to the t-th sampling time. The real-time temperature and the target temperature corresponding to the t-th sampling time are displayed on the display module of the control system in real time, so as to obtain temperature information and control status in a timely manner.

[0026] Obtain the temperature difference between the target temperature and the real-time temperature at the t-th sampling time;

[0027] The temperature difference at the t-th sampling time is input into the open-source electronic development board Arduino controller to perform dual-channel execution adjustment PID calculation to obtain the control signal corresponding to the t-th sampling time of the control system.

[0028] The control signal corresponding to the t-th sampling time is output to the temperature regulation unit to adjust the temperature and the rate of temperature change, thereby obtaining the temperature control effect at the t-th sampling time.

[0029] The temperature control effect at the t-th sampling time is fed back to the control unit through the same signal from the temperature sensor, forming a closed-loop feedback, and the control signal output corresponding to the next sampling time t+1 is obtained.

[0030] Preferably, the expression for the dual-path PID calculation is:

[0031]

[0032] Where u(t) is the control signal corresponding to the t-th acquisition time, e(t) is the error between the target temperature and the actual temperature corresponding to the t-th acquisition time, t=1,2,3…T, T represents the total number of acquisition times, Kp is the proportional control coefficient of the controller, Ki is the integral control coefficient of the controller, and Kd is the derivative control coefficient of the controller.

[0033] Preferably, the control signal corresponding to the t-th sampling time is output to the temperature regulation unit to adjust the temperature and the rate of temperature change, thereby obtaining the temperature control effect at the t-th sampling time. Specific steps include:

[0034] When the relay module is turned on, and the control signal corresponding to the t-th sampling time indicates that heating is required, the heating module is turned on. The actuation amount of the heating module is adjusted according to the control signal corresponding to the t-th sampling time to heat the controlled object. At the same time, the cooling module adjusts the actuation amount of the cooling module according to the control signal to work together to achieve the temperature control effect at the t-th sampling time.

[0035] When the control signal corresponding to the t-th sampling time indicates that cooling is required, the cooling module is turned on. The actuation amount of the cooling module is adjusted according to the control signal corresponding to the t-th sampling time to cool the controlled object. At the same time, the heating module adjusts its actuation amount according to the control signal to work together to achieve the temperature control effect at the t-th sampling time.

[0036] When the temperature control effect at the t-th sampling time reaches the temperature control target or the temperature exceeds the safe operating range, the safety power-off module controls the control system to perform a safety power-off.

[0037] Preferably, the actuation quantities include: heating current, heating power, valve opening degree, and valve flow rate; the heating module adopts induction heating; and the cooling module adopts impact cooling.

[0038] The technical solution of this invention feeds back the temperature change of the temperature control effect to the control unit through the same signal from the temperature sensor, forming a closed-loop feedback, and obtains the control signal output at the next sampling moment, so that the temperature difference approaches 0, and realizes rapid temperature change tracking.

[0039] The technical solution of this invention uses an open-source electronic development board Arduino controller to perform dual-channel PID calculation on the temperature difference between the real-time temperature and the target temperature, and outputs a control signal to the temperature adjustment unit. When heating is needed, the relay module is turned on, and the heating module works according to the magnitude of the control signal. When cooling is needed, the cooling module works according to the magnitude of the control signal. The two actuators work together to adjust the rate of temperature change in real time.

[0040] Compared with the prior art, the present invention has at least the following beneficial effects:

[0041] (1) The control system of the present invention is equipped with a temperature control target, a setting module and a temperature display module. It can be applied to different temperature regulation scenarios without changing the temperature controller, so as to realize the control of temperature change requirements of different air-cooled-hot environments. It is both easy to operate and low in cost.

[0042] (2) The control system of the present invention is a closed-loop control system. The dual actuators adjust the actuation amount in real time according to the same feedback signal of the temperature control effect. The temperature change feedback is timely, the anti-interference ability is strong, and the control accuracy is high, providing technical support for reproducing the air-cooled-hot environment of the near-service conditions of aero-engines.

[0043] (3) The control system of the present invention is equipped with an intelligent safety power-off module. When the temperature control is completed or exceeds the safe working range, the safety switch is disconnected in time to avoid the danger caused by continuous high temperature, ensure environmental safety and avoid damage to the controlled equipment. Attached Figure Description

[0044] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0045] Figure 1 This is a schematic diagram of the structural modules of the rapid temperature change tracking control system under air-cooled-heated environment of the present invention;

[0046] Figure 2 This is a schematic diagram of the control logic based on the Arduino control board of this invention.

[0047] Reference numerals: Setting unit 1, sensor module 2, control unit 3, temperature adjustment unit 4 and power supply module 5, input setting module 101, communication module 102, display module 103, clock module 301, control module 302, setting module 303, relay module 401, heating module 402, cooling module 403, safety power-off module 404. Detailed Implementation

[0048] To better understand the above-described objectives, features, and advantages of the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other. Furthermore, the present invention can be implemented in other ways different from those described herein; therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0049] To illustrate the effectiveness of the method proposed in this invention, the following detailed description of the above technical solution is provided through a specific embodiment. The specific implementation steps are as follows:

[0050] A specific embodiment of the present invention, such as Figure 1-2 A rapid temperature change tracking control system for air-cooled and hot environments is disclosed. Specifically, it relates to an Arduino-based rapid temperature change tracking control system for air-cooled and hot environments, including: a setting unit 1, a sensor module 2, a control unit 3, a temperature adjustment unit 4, and a power supply module 5.

[0051] The control unit includes a clock module 301, a control module 302, and a tuning module 30; the clock module and the tuning module are integrated on the control module; the control module controls and coordinates the operation of the entire system.

[0052] The clock module is used to unify the sampling time and the time corresponding to the target temperature; the tuning module is used to tune the accuracy of the parameters of the Arduino controller on the open-source electronic development board, and obtain the proportional control coefficient, integral control coefficient and derivative control coefficient of the controller; the control module controls and coordinates the operation of the entire control system.

[0053] Preferably, the control module uses an open-source electronic development board Arduino controller, and the clock module and tuning module are integrated on the open-source electronic development board Arduino controller.

[0054] The technical solution of this invention uses an open-source electronic development board Arduino controller to handle data processing and transmission functions. It includes multiple input and output interfaces and is relatively small in size.

[0055] The setting unit includes an input setting module 101, a communication module 102, and a display module 103; the output terminal of the input setting module is connected to the input terminal of the communication module, the output terminal of the communication module is connected to the input terminal of the display module, and the output terminal of the display module is connected to the input terminal of the open-source electronic development board Arduino controller.

[0056] The technical solution of this invention connects the display module with the open-source electronic development board Arduino controller. That is, the open-source electronic development board Arduino controller is connected with the setting unit, forming a setting-display-transmission interactive system in the setting unit. This system is intuitive, easy to modify and store, and has low cost.

[0057] The sensor module is a temperature sensor; the output terminals of the power module and the sensor module are respectively connected to the input terminal of the control unit.

[0058] The sensor module of this invention uses a temperature sensor to detect the temperature of the temperature control target in real time.

[0059] The temperature regulation unit includes a relay module 401, a heating module 402, a cooling module 403, and a safety power-off module 404; the input terminals of the heating module and the cooling module are connected to the output terminal of the relay module; the output terminals of the heating module and the cooling module are connected to the input terminal of the sensor module.

[0060] The output of the Arduino controller on the open-source electronic development board is connected to the input of the safety power-off module and the relay module, respectively.

[0061] Another objective of this invention is to provide a control method for a rapid temperature change tracking control system under air-cooled / heated conditions, specifically relating to a control method for a rapid temperature change tracking control system under air-cooled / heated conditions based on Arduino, comprising:

[0062] Connect the power module for rapid temperature tracking under air-cooled and hot environments, initialize the control system, and obtain the initialized control system.

[0063] In the initialized control system, preset temperature parameters are input to obtain the target temperature change curve; the temperature parameters include: initial temperature, final temperature, temperature change time, temperature hold time, and temperature change rate, such as... Figure 2 As shown; the target temperature change curve is a temperature function curve, which can be a polygonal line, a trapezoidal wave, or a parabola;

[0064] The target temperature change curve is input into the open-source electronic development board Arduino controller through the communication module to obtain the temperature control target of the control system; the temperature control target includes: the temperature change rate and the temperature change range.

[0065] Establish the transfer function for the tuning module;

[0066] The open-source electronic development board Arduino controller tunes the controller parameters according to the transfer function of the tuning module, obtaining the proportional control coefficient, integral control coefficient, and derivative control coefficient of the controller; the parameters include: the proportional gain, integral time, and derivative time of the controller;

[0067] Turn on the control switch of the control system;

[0068] The clock module is set to collect T sampling times for temperature, and the target temperature corresponding to the t-th sampling time is obtained. At the same time, the temperature sensor is used to collect the real-time temperature of the control system environment corresponding to the t-th sampling time. The real-time temperature and the target temperature corresponding to the t-th sampling time are displayed on the display module of the control system in real time, so as to obtain temperature information and control status in a timely manner.

[0069] Obtain the temperature difference between the target temperature and the real-time temperature at the t-th sampling time;

[0070] The temperature difference at the t-th sampling time is input into the open-source electronic development board Arduino controller, and dual-channel execution adjustment PID calculation is performed to obtain the control signal corresponding to the t-th sampling time of the control system.

[0071] The control signal corresponding to the t-th sampling time is output to the temperature regulation unit to adjust the temperature and the rate of temperature change, thereby obtaining the temperature control effect at the t-th sampling time.

[0072] The temperature control effect at the t-th sampling time is fed back to the control unit through the same signal from the temperature sensor, forming a closed-loop feedback, and the control signal output corresponding to the next sampling time t+1 is obtained.

[0073] Preferably, the expression for the dual-path PID calculation is:

[0074]

[0075] Where u(t) is the control signal corresponding to the t-th acquisition time, e(t) is the error between the target temperature and the actual temperature corresponding to the t-th acquisition time, t=1,2,3…T, T represents the total number of acquisition times, Kp is the proportional control coefficient of the controller, Ki is the integral control coefficient of the controller, and Kd is the derivative control coefficient of the controller.

[0076] Preferably, the control signal corresponding to the t-th sampling time is output to the temperature regulation unit to adjust the temperature and the rate of temperature change, thereby obtaining the temperature control effect at the t-th sampling time. Specific steps include:

[0077] When the relay module is turned on, and the control signal corresponding to the t-th sampling time indicates that heating is required, the heating module is turned on. The actuation amount of the heating module is adjusted according to the control signal corresponding to the t-th sampling time to heat the controlled object. At the same time, the cooling module adjusts the actuation amount of the cooling module according to the control signal to work together to achieve the temperature control effect at the t-th sampling time.

[0078] When the control signal corresponding to the t-th sampling time indicates that cooling is required, the cooling module is turned on. The actuation amount of the cooling module is adjusted according to the control signal corresponding to the t-th sampling time to cool the controlled object. At the same time, the heating module adjusts its actuation amount according to the control signal to work together to achieve the temperature control effect at the t-th sampling time.

[0079] When the temperature control effect at the t-th sampling time reaches the temperature control target or the temperature exceeds the safe operating range, the safety power-off module controls the control system to perform a safety power-off.

[0080] Preferably, the actuation quantities include: heating current, heating power, valve opening degree, and valve flow rate; the heating module adopts induction heating; and the cooling module adopts impact cooling.

[0081] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A fast temperature tracking control system in air-cooled-thermal environment, characterized in that, The rapid temperature changing tracking control system comprises a setting unit (1), a sensor module (2), a control unit (3), a temperature adjusting unit (4) and a power module (5); The control unit is used for processing the received temperature information to obtain a corresponding control signal; The control unit further comprises a clock module (301); the clock module is used for sampling time corresponding to a target temperature; The control unit comprises a control module (302) and a setting module (303); the control module adopts an open source electronic development board Arduino controller; The control module controls and coordinates the operation of the entire control system; the setting module is used for setting the precision of the control parameter of the control module; the temperature adjusting unit obtains a corresponding temperature control effect according to the control signal, and feeds back to the control unit to form a closed loop feedback to obtain a next control signal; The temperature adjusting unit (4) comprises a relay module (401), a heating module (402), a cooling module (403) and a safety power-off module (404); the input ends of the heating module (402) and the cooling module (403) are connected with the output end of the relay module (401); the output ends of the heating module and the cooling module are connected with the input end of the sensor module; The output end of the open source electronic development board Arduino controller is connected with the input end of the safety power-off module (404) and the relay module (401) respectively; The clock module (301) sets T sampling time points of collected temperature, obtains a target temperature corresponding to a tth sampling time point, t=1, 2, …, T; the sensor module is used for collecting the real-time temperature of the controlled object corresponding to the tth sampling time point; The control signal corresponding to the tth sampling time point is output to the temperature adjusting unit, the relay module (401) is turned on, when the control signal corresponding to the tth sampling time point is heating, the heating module (402) is turned on, the heating module (402) is adjusted according to the control signal corresponding to the tth sampling time point to heat the controlled object, the cooling module (403) is adjusted according to the control signal to work cooperatively, and the temperature control effect of the tth sampling time point is obtained; When the control signal corresponding to the tth sampling time point is cooling, the cooling module (403) is turned on, the cooling module (403) is adjusted according to the control signal corresponding to the tth sampling time point to cool the controlled object, the heating module is adjusted according to the control signal to work cooperatively, and the temperature control effect of the tth sampling time point is obtained.

2. The rapid thermocycling tracking control system under gas cooling-thermal environment according to claim 1, characterized in that, The clock module and the setting module are integrated on the open source electronic development board Arduino controller.

3. A method for fast temperature tracking control in air-cooled thermal environment, using the fast temperature tracking control system in air-cooled thermal environment according to any one of claims 1-2, characterized in that, The steps comprise: The power module of the rapid temperature changing tracking control system in the air cooling-thermal environment is turned on, the control system is initialized, and the initialized control system is obtained; In the initialized control system, preset temperature parameters are input, and a target temperature change curve is obtained; the temperature parameters comprise an initial temperature, a terminal temperature, a temperature change time, a temperature holding time and a temperature change rate; Input the target temperature change curve into an open source electronic development board Arduino controller to obtain a temperature control target of the control system; The temperature control target comprises a temperature change rate and a temperature change interval; Establish a transfer function of the setting module; The open source electronic development board Arduino controller performs parameter setting on the controller according to the transfer function of the setting module to obtain proportional control coefficients, integral control coefficients and differential control coefficients of the controller; Turn on the control switch of the control unit; Set T sampling time points of collecting temperature in the clock module to obtain a target temperature corresponding to the tth sampling time point, t = 1, 2, …, T; and use the sensor module to collect a real-time temperature of the controlled object corresponding to the tth sampling time point; Obtain a temperature difference value of the target temperature and the real-time temperature corresponding to the tth sampling time point; Input the temperature difference value of the tth sampling time point into the open source electronic development board Arduino controller to obtain a control signal corresponding to the tth sampling time point of the control system; Output the control signal corresponding to the tth sampling time point to the temperature adjusting unit, connect the relay module (401), when the control signal corresponding to the tth sampling time point is heating, connect the heating module (402), adjust the actuating amount of the heating module (402) according to the control signal corresponding to the tth sampling time point to heat the controlled object, and the cooling module (403) simultaneously adjusts the actuating amount of the cooling module according to the control signal to work cooperatively to obtain the temperature control effect of the tth sampling time point; When the control signal corresponding to the tth sampling time point is cooling, connect the cooling module (403), adjust the actuating amount of the cooling module (403) according to the control signal corresponding to the tth sampling time point to cool the controlled object, and the heating module simultaneously adjusts the actuating amount of the heating module (402) according to the control signal to work cooperatively to obtain the temperature control effect of the tth sampling time point; Feed back the temperature control effect of the tth sampling time point to the control unit through the sensor module to form a closed loop feedback to obtain a control signal corresponding to the t+1th sampling time point.

4. The control method according to claim 3, characterized by, The expression of the control signal corresponding to the tth sampling time point of the control system is: Wherein, u(t) is the control signal corresponding to the tth acquisition time, e(t) is the temperature difference value corresponding to the target temperature and the actual temperature at the tth acquisition time, t=1, 2, 3…T, T represents the total number of acquisition times, K p Kp is the proportional control coefficient of the controller, K i Ki is the integral control coefficient of the controller, K d Kd is the differential control coefficient of the controller.

5. The control method according to claim 3, characterized by, When the temperature control effect of the tth sampling time point completes the temperature control target or the temperature exceeds the safe working range of the control system, the safety power-off module performs safety power-off.

6. The control method according to claim 3, the actuation amount comprising: Heating current, heating power, and valve opening, valve flow rate.

Images