An industrial oven temperature control method, control device and instrument system based on dynamic heat dissipation compensation

Abstract

The present application relates to a kind of industrial oven temperature control method based on dynamic heat dissipation compensation, control device and instrument system, belong to industrial process control and temperature control instrument technical field.The method includes: real-time acquisition industrial oven internal temperature, external environment temperature and the real-time speed of internal circulating fan;According to the temperature difference between internal temperature and external environment temperature, and combine fan real-time speed, determine the heat dissipation intensity characteristic value for representing current heat dissipation state;According to the heat dissipation intensity characteristic value, the output bias of PID controller and integral parameter are dynamically corrected;The control parameter after correction is combined with temperature deviation feedback control, generates the control output for driving heating execution mechanism.The control device is used to execute the above-mentioned temperature control method, the instrument system includes temperature detection interface, fan speed detection interface, man-machine interaction unit, alarm unit and communication interface.The present application introduces the heat dissipation condition change caused by fan variable speed into temperature control process, so that controller can carry out dynamic heat dissipation compensation on the basis of feedback regulation, it is helpful to reduce the influence of fan speed variation on oven temperature stability.

Description

Technical Field

[0001] This invention relates to the field of industrial process control and temperature control instrument technology, and in particular to an industrial oven temperature control method, control device and instrument system for dynamic heat dissipation compensation under variable speed operation of the circulating fan in an industrial oven. Background Technology

[0002] Industrial ovens are widely used in processes requiring controlled heating, constant temperature maintenance, or heat treatment. In actual operation, a circulating fan is typically installed inside the oven to improve airflow and heat distribution within the cavity. Depending on the needs of different process stages, the circulating fan may switch between different speeds or be continuously adjusted.

[0003] Changes in the speed of the circulating fan alter the airflow within the oven, further affecting the convective heat transfer conditions between the interior and exterior. When a temperature difference exists between the interior and exterior temperatures, increasing the fan speed typically enhances heat transfer, altering the system's heat dissipation conditions; conversely, decreasing the fan speed changes the heat dissipation. Therefore, fan speed is not merely a ventilation or circulation parameter but also influences the thermal equilibrium state of the controlled environment.

[0004] Current industrial oven temperature control typically employs fixed-parameter PID control or simple tuning based on fixed parameters. This type of control relies primarily on temperature deviation feedback for adjustment; the controller only corrects itself based on the deviation when the actual temperature deviates from the target temperature. When fan speed changes significantly, changes in heat dissipation conditions may appear before temperature deviations, making reliance solely on feedback adjustment prone to response lag, leading to increased temperature fluctuations or prolonged recovery periods.

[0005] Some solutions attempt to employ more complex data-driven control methods, but these methods typically have high requirements for computing resources, model training, or on-site debugging conditions, resulting in high deployment and maintenance costs in ordinary industrial controllers. For equipment with a clear heat exchange mechanism, such as industrial ovens, if the fan speed and the internal and external temperature difference can be used together to characterize the current heat dissipation state, and this heat dissipation state can be incorporated into the temperature control output correction process, it is hoped that the temperature control stability under variable fan speed conditions can be improved while maintaining the simplicity of engineering implementation.

[0006] Therefore, there is a need for an industrial oven temperature control method that compensates for changes in heat dissipation conditions caused by fan speed variations, enabling the temperature controller to perform feedforward correction based on feedback regulation and the current heat dissipation status. Summary of the Invention

[0007] 1. Technical problems to be solved This invention aims to solve the problem that when an industrial oven operates with a variable-speed circulating fan, the heat dissipation conditions change with the fan speed and the internal and external temperature difference, causing the fixed-parameter PID control to lag in response to temperature disturbances. The invention proposes a temperature control method, control device, and instrumentation system for industrial ovens based on dynamic heat dissipation compensation.

[0008] 2. Technical Solution To achieve the above objectives, the present invention provides an industrial oven temperature control method based on dynamic heat dissipation compensation, comprising the following steps: The system acquires real-time parallel signals of the oven's internal temperature, external ambient temperature, and internal circulating fan speed through a high-precision sensor and inverter interface. A first-order low-pass filter algorithm is used to extract smooth temperature gradients and wind speed trends, filtering out random noise and providing a stable and reliable data input source for the physical heat dissipation model. Based on Newton's law of cooling in thermodynamics, a heat dissipation intensity characteristic value reflecting the current system heat dissipation level is constructed by utilizing the nonlinear coupling relationship between temperature gradient and fan speed. This characteristic value quantifies the energy loss rate caused by forced convection in real time, making the invisible heat dissipation environment disturbance explicit into a physical observation signal that the controller can perceive. The adaptive mapping module receives the feature value and dynamically adjusts the output bias and integral gain of the PID controller based on it. When the fan speed increases, causing the feature value to increase, the system synchronously increases the base output power according to the positive correlation mapping rule, realizing feedforward offsetting of the thermal balance gap and avoiding the traditional feedback response lag problem caused by sudden changes in heat dissipation. The main controller module superimposes the feedforward bias correction value and the feedback adjustment value based on the deviation calculation to generate the final output control value for the current cycle. The power drive module precisely adjusts the energy released by the heating mechanism to achieve real-time compensation for heat dissipation losses. The entire closed-loop process ensures high consistency temperature control accuracy of the industrial oven under varying operating conditions.

[0009] To address the aforementioned problems, this invention also provides an industrial oven temperature control device based on dynamic heat dissipation compensation. The control device includes a multi-source data acquisition module, a heat dissipation modeling and estimation module, an adaptive mapping module, a main controller module, and a power drive module. The multi-source data acquisition module acquires the internal temperature, external ambient temperature, and fan speed; the heat dissipation modeling and estimation module determines the heat dissipation intensity characteristic value based on the internal and external temperature difference and fan speed; the adaptive mapping module generates an output bias and adaptive integral parameters based on the heat dissipation intensity characteristic value; the main controller module generates a control output based on the temperature deviation and the aforementioned correction parameters; and the power drive module drives the heating actuator according to the control output.

[0010] To address the aforementioned problems, this invention also provides an industrial oven temperature control system based on dynamic heat dissipation compensation. The system includes the aforementioned temperature control device, as well as a temperature detection interface, a fan speed detection interface, a human-machine interface unit, an alarm unit, and a communication interface connected to the temperature control device. The system can perform temperature acquisition, fan speed acquisition, temperature control parameter setting, operating status display, abnormal alarms, and data interaction with a host computer or PLC.

[0011] To address the aforementioned problems, the present invention also provides a storage medium storing a computer program, wherein the computer program is configured to execute the above-described method at runtime.

[0012] To address the aforementioned problems, the present invention also provides an electronic device, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the method described in any of the preceding claims.

[0013] 3. Beneficial effects Compared to existing technologies, this invention addresses the temperature control fluctuation problem of industrial ovens under variable airflow conditions, achieving the following benefits: This invention incorporates both fan speed variation and internal / external temperature difference into the heat dissipation state characterization process, enabling changes in heat dissipation conditions caused by fan speed variation to form a usable feedforward input in the controller, which helps reduce the hysteresis effect of simple feedback control.

[0014] This invention utilizes the heat dissipation intensity characteristic value to dynamically correct the output bias and integral parameters, enabling the control output to adjust according to changes in heat dissipation status, thereby improving the temperature stability of the fan under variable speed operation.

[0015] This invention achieves control correction based on temperature signals, fan speed signals, and preset mapping relationships, without relying on complex calculation models, making it easy to implement and debug in existing control systems of industrial ovens. Attached Figure Description

[0016] Figure 1 This is a schematic flowchart of the adaptive temperature control method for industrial ovens based on dynamic heat dissipation compensation proposed in this invention. Figure 2 This is a functional block diagram of the industrial oven temperature control device based on dynamic heat dissipation compensation proposed in this invention. Figure 3 This is a schematic diagram of the electronic device for implementing the industrial oven temperature control method based on dynamic heat dissipation compensation proposed in this invention. Detailed Implementation The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] See Figure 1 This invention provides a method for temperature control of an industrial oven based on dynamic heat dissipation compensation. Before executing this method, the controller preloads preset process parameters from non-volatile memory. These parameters include: a basic proportional coefficient. Basic integral gain Forced convection compensation coefficient Bias weighting factor Safe power threshold (Typically set to 90% of the heater's rated power) and the time constant of the first-order low-pass filter. The method specifically includes the following steps: S1: Multi-source operating condition parameter acquisition.

[0018] The control system collects the internal temperature of the oven during operation. and external ambient temperature And obtain the speed signal of the internal circulating fan. Oven internal temperature Used to reflect the current temperature status of the cavity and the external ambient temperature. Used to reflect the temperature difference between the oven and the outside environment, fan speed signal It is used to reflect the influence of the circulating fan on the airflow state inside the cavity.

[0019] In practical implementation, the aforementioned signals can be input to the controller according to a preset sampling period. For acquired signals with instantaneous fluctuations, the controller can perform smoothing processing according to engineering needs to reduce the impact of random fluctuations on subsequent heat dissipation state estimation. This smoothing processing does not change the basic control logic of this invention for dynamic heat dissipation compensation based on internal and external temperature difference and fan speed.

[0020] S2: Determination of heat dissipation intensity characteristic value.

[0021] The controller is based on the internal temperature of the oven. With external ambient temperature Calculate the temperature difference between inside and outside And combined with the fan speed signal Determine the characteristic value of heat dissipation intensity The heat dissipation intensity characteristic value It is used to characterize the degree of change in the heat dissipation status of the oven under the current operating conditions.

[0022] In one implementation, the heat dissipation intensity characteristic value It can be determined using the following formula: in, This is a preset forced convection compensation constant. This constant can be predetermined based on equipment commissioning, calibration, or empirical tuning methods, and is used to reflect the degree of influence of fan speed changes on heat dissipation.

[0023] Through the above processing, the internal and external temperature difference and the fan speed are combined into a single heat dissipation intensity characteristic value that can be used for control correction. When the internal and external temperature difference is large or the fan speed increases, the heat dissipation intensity characteristic value changes accordingly, and the controller can identify the changing trend of the current heat dissipation conditions based on this.

[0024] S3: Output bias and integral parameter correction.

[0025] The adaptive mapping module receives heat dissipation intensity feature values. The output bias of the PID controller is generated according to the preset mapping relationship. and adaptive integral coefficients .

[0026] In one implementation, the output bias is... and adaptive integral coefficients Determine as follows: in, This is the bias weighting factor. For integral enhancement coefficients, These are the basic integration parameters.

[0027] Output bias It participates in the formation of the control output as a feedforward compensation quantity. When the heat dissipation intensity characteristic value... When the value increases, the output bias amount This increases accordingly to compensate for the enhanced heat dissipation caused by changes in fan speed. Adaptive integral coefficient. This is used to adjust the integral stage's ability to correct for temperature deviations, so that the integral action can change accordingly with the current heat dissipation status.

[0028] Before executing the control output, the system can adjust the output bias. Perform amplitude limiting verification. When the output bias is... When the preset safety boundary value is exceeded, the controller will limit the output bias to that preset safety boundary value and output a heat dissipation abnormality warning signal. This process helps to prevent abnormal speed signals or abnormal temperature signals from causing the output bias to exceed the expected range.

[0029] S4: Feedforward-feedback composite control output.

[0030] The main controller module will output the bias value. Adaptive integral coefficients The temperature deviation signal is introduced into the PID control process to generate the current control output. In one implementation, the output quantity is controlled. It can be formed by both feedforward compensation and feedback adjustment: in, The deviation between the target temperature and the actual temperature. It is the basic proportional coefficient.

[0031] The power drive module receives control output. The system then drives the heating actuator based on the control output. Thus, when the circulating fan speed changes and causes a change in heat dissipation, the control system can use the heat dissipation intensity characteristic value to pre-correct the output bias, while retaining feedback adjustment based on temperature deviation, thereby forming a feedforward-feedback composite control process.

[0032] See Figure 2 This embodiment provides an industrial oven temperature control device based on dynamic heat dissipation compensation, whose functional modules specifically include: Multi-source data acquisition module 201: Used to acquire the internal temperature of the oven, the external ambient temperature, and the circulating fan speed, and to provide the internal and external temperature difference signal and fan speed signal to the heat dissipation modeling and estimation module. This module can be connected to existing temperature acquisition units and fan speed feedback units; Heat dissipation modeling and estimation module 202: This module determines the heat dissipation intensity characteristic value based on the internal and external temperature difference signal and the fan speed signal. The output of this module does not directly drive the heating actuator, but rather serves as the input for subsequent parameter correction. Adaptive mapping module 203: Used to generate output bias and adaptive integral parameters based on the heat dissipation intensity characteristic value. When the heat dissipation intensity characteristic value changes, the adaptive mapping module updates the corresponding control parameters according to the preset mapping relationship and outputs the updated parameters to the main controller module; Main controller module 204: Used to receive target temperature, actual temperature, output bias and adaptive integral parameters, and to superimpose feedforward compensation on the basis of temperature deviation closed-loop control to form control output; Power drive module 205: Used to receive the control output from the main controller module and drive the heating actuator according to the control output to adjust the heating power of the oven.

[0033] This embodiment also provides an industrial oven temperature control system based on dynamic heat dissipation compensation. The temperature control system includes the aforementioned temperature control device, as well as a temperature detection interface, a fan speed detection interface, a human-machine interface unit, an alarm unit, and a communication interface connected to the temperature control device.

[0034] The system includes the following components: a temperature detection interface for connecting to internal and external temperature sensors, and inputting the collected temperature signals into a multi-source data acquisition module; a fan speed detection interface for receiving feedback signals from the internal circulating fan, and inputting these signals into the multi-source data acquisition module; a human-machine interface for displaying internal oven temperature, target temperature, external ambient temperature, fan speed, heat dissipation intensity characteristic value, and control output status, and for receiving settings for target temperature, PID parameters, and heat dissipation compensation parameters; an alarm unit for outputting alarm prompts when the output bias exceeds a preset safety boundary value or the temperature deviation exceeds a preset alarm threshold; and a communication interface for data exchange with a host computer, PLC, or industrial bus device.

[0035] With the above settings, the temperature control instrument system can realize dynamic heat dissipation compensation temperature control function in the existing industrial oven control cabinet or temperature control instrument installation environment, which facilitates on-site parameter setting, operation status viewing, abnormal alarm and industrial communication.

[0036] See Figure 3 This embodiment also provides an electronic device architecture for implementing the above control method. The electronic device includes a processor and a memory connected via a system bus. The memory may include a non-volatile storage medium and internal memory. The non-volatile storage medium may store an operating system and a computer program. The computer program includes program instructions that, when executed, cause the processor to execute any industrial oven temperature control method based on dynamic heat dissipation compensation.

[0037] The processor provides computing and control capabilities, supporting the operation of the entire computer device.

[0038] The internal memory provides an environment for the execution of computer programs in non-volatile storage media. When the computer program is executed by the processor, it enables the processor to execute any industrial oven temperature control method based on dynamic heat dissipation compensation.

[0039] Those skilled in the art will understand that Figure 3 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific electronic devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

Claims

1. A method for temperature control of an industrial oven based on dynamic heat dissipation compensation, characterized in that, Includes the following steps: S1: Real-time monitoring of oven internal temperature With external ambient temperature And acquire the speed signal of the internal circulating fan in real time. ; S2: Calculate the temperature gradient And combined with the speed signal The heat dissipation intensity characteristic value of the current heat dissipation state is calculated using a preset convection heat dissipation model. ; S3: The heat dissipation intensity characteristic value The input parameter correction process dynamically adjusts the output bias of the PID controller according to a preset mapping relationship. With adaptive integral coefficients ; Wherein, when the heat dissipation intensity characteristic value When the value increases, the output bias amount The positive correlation is increased to provide feedforward compensation for the heat dissipation changes caused by the fan speed change; S4: Set the output bias amount and the adaptive integral coefficients By introducing closed-loop calculations from a PID controller and combining them with the temperature deviation signal, the current control output is generated. And based on the current control output quantity Drive heating actuator.

2. The method according to claim 1, characterized in that, In step S2, the heat dissipation intensity characteristic value The calculation formula is: in, This is the preset forced convection compensation constant.

3. The method according to claim 1, characterized in that, In step S3, the output bias amount With the adaptive integral coefficient Correct it as follows: in, This is the bias weighting factor. For integral enhancement coefficients, These are the basic integration parameters.

4. The method according to claim 1, characterized in that, Before performing step S4, the output bias is adjusted. Perform amplitude limiting verification; when the output bias amount When the preset safety boundary value is exceeded, the output bias amount will be... The system is limited to the preset safety boundary value and an abnormal heat dissipation warning signal is output.

5. A temperature control device for an industrial oven based on dynamic heat dissipation compensation, characterized in that, The control device includes: The multi-source data acquisition module is used to acquire the internal temperature of the oven, the external ambient temperature, and the real-time speed of the internal circulating fan, and outputs the internal and external temperature difference signal and the fan speed signal. A heat dissipation modeling and estimation module is connected to the multi-source data acquisition module and is used to determine the heat dissipation intensity characteristic value based on the internal and external temperature difference signal and the fan speed signal. An adaptive mapping module, connected to the heat dissipation modeling and estimation module, is used to generate the output bias and adaptive integral parameters of the PID controller based on the heat dissipation intensity characteristic value. The main controller module, connected to the adaptive mapping module, is used to introduce the output bias and the adaptive integral parameter into the temperature deviation closed-loop control process to generate a control output. The power drive module, connected to the main controller module, is used to receive the control output and drive the heating actuator according to the control output.

6. An industrial oven temperature control system based on dynamic heat dissipation compensation, characterized in that, It includes the industrial oven temperature control device as described in claim 5, and a temperature detection interface, a fan speed detection interface, a human-machine interaction unit, an alarm unit, and a communication interface connected to the industrial oven temperature control device; The temperature detection interface is used to connect the internal temperature sensor of the oven and the external ambient temperature sensor. The fan speed detection interface is used to receive the speed feedback signal of the internal circulating fan; The human-machine interaction unit is used to display the internal temperature of the oven, the target temperature, the external ambient temperature, the fan speed, the heat dissipation intensity characteristic value and the control output status, and to receive the settings of the target temperature, PID parameters and heat dissipation compensation parameters. The alarm unit is used to output an alarm prompt when the output bias exceeds a preset safety boundary value or the temperature deviation exceeds a preset alarm threshold. The communication interface is used for data interaction with a host computer, PLC, or industrial bus device.

7. A storage medium, characterized in that, The storage medium stores a computer program, wherein the computer program is configured to execute the method of any one of claims 1-4 when it is run.

8. An electronic device comprising a memory and a processor, characterized in that, The memory stores a computer program, and the processor is configured to run the computer program to perform the method of any one of claims 1-4.

Images