Two-channel PID (Proportion Integration Differentiation) regulator

Abstract

The utility model discloses a dual-channel PID regulator, and relates to the field of equipment control, and the dual-channel PID regulator comprises a driving module which is connected with a regulating module and controlled equipment, and is used for driving the controlled equipment; the number of data of the driving module is two; the adjusting module is connected with the upper computer, and the adjusting module is used for adjusting the controlled equipment; and the upper computer is used for communicating with the adjusting module. According to the dual-channel PID regulator, synchronous control and regulation of the two controlled devices are realized.

Description

Technical Field

[0001] This utility model relates to the field of equipment control, and more specifically to a dual-channel PID controller. Background Technology

[0002] In modern industrial production, precise control of production equipment is essential to meet production needs. In industrial automation, PID control is generally used to achieve precise control.

[0003] Currently, conventional PID (Proportional-Integral-Derivative) controllers on the market provide one-to-one control of actuators and are quite large in size. As a result, when dealing with multi-point PID control, a large number of PID controllers are required, which increases the cost. In addition, in actual industrial field control, there are often situations where the control outputs of two channels need to be coordinated with each other. In such cases, it is difficult to achieve real-time coordination and interaction using only a single-channel independent PID controller. Utility Model Content

[0004] The purpose of this invention is to provide a dual-channel PID controller, which enables synchronous control of two controlled devices.

[0005] To achieve the above objectives, this utility model provides a dual-channel PID controller, comprising:

[0006] The drive module is connected to both the adjustment module and the controlled device. The drive module is used to drive the controlled device. The drive module has two data points.

[0007] The adjustment module is connected to the host computer and is used to adjust the controlled equipment.

[0008] The host computer is used to communicate with the adjustment module.

[0009] In another embodiment, the driving module includes:

[0010] The control signal execution unit is used to execute the control signals issued by the adjustment module.

[0011] In another embodiment, the driver module further includes:

[0012] The execution feedback unit is used to feed back the execution results of the controlled equipment to the adjustment module.

[0013] In another embodiment, the adjustment module includes:

[0014] The signal generation unit is used to generate control signals and send them to the drive module.

[0015] In another embodiment, the adjustment module further includes:

[0016] Error cancellation unit, used to eliminate errors in control signals.

[0017] In another embodiment, the adjustment module further includes:

[0018] The adjustment feedback unit is used to feed back the control results to the host computer.

[0019] In another embodiment, the adjustment module further includes:

[0020] The information receiving unit is used to receive the execution results fed back by the driver module and the control information sent by the host computer.

[0021] In another embodiment, the host computer includes:

[0022] The data monitoring unit is used to obtain the execution results fed back by the adjustment module in real time.

[0023] In another embodiment, the host computer further includes:

[0024] The parameter optimization unit is used to optimize the control parameters of the dual-channel PID controller based on the execution results.

[0025] In another embodiment, the host computer further includes:

[0026] The human-machine interface unit is used to assist maintenance personnel in operating the dual-channel PID controller.

[0027] The beneficial effects of this utility model are as follows:

[0028] The dual-channel PID controller of this invention includes: a drive module, which is connected to both the control module and the controlled device, and is used to drive the controlled device; the drive module has two data points; a control module, which is connected to a host computer and is used to control the controlled device; and a host computer, which communicates with the control module. Because there are two drive modules, synchronous control of two controlled devices can be achieved, and the host computer allows for human-machine interaction, facilitating control of the dual-channel PID controller by maintenance personnel.

[0029] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a dual-channel PID controller according to an embodiment of this application;

[0031] Figure 2 This is a schematic diagram illustrating the principle of a dual-channel PID controller according to an embodiment of this application. Detailed Implementation

[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] It should be noted that references to "an embodiment," "embodiment," "example embodiment," etc., in this specification refer to the described embodiment including specific features, structures, or characteristics; however, not every embodiment must include these specific features, structures, or characteristics. Furthermore, such expressions do not refer to the same embodiment. Moreover, when describing specific features, structures, or characteristics in conjunction with embodiments, whether or not explicitly described, it is indicated that incorporating such features, structures, or characteristics into other embodiments is within the knowledge of those skilled in the art.

[0034] Furthermore, certain terms are used in the specification and subsequent claims to refer to specific components or parts. Those skilled in the art will understand that manufacturers may use different names or terms to refer to the same component or part. This specification and subsequent claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout the specification and subsequent claims are open-ended and should be interpreted as "including but not limited to." Additionally, the term "connection" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connections made through other means.

[0035] See Figure 1 A schematic diagram of a dual-channel PID controller is provided. The dual-channel PID controller includes:

[0036] The drive module is connected to both the adjustment module and the controlled device, and is used to drive the controlled device. The drive module has two data sets. The adjustment module is connected to the host computer and is used to adjust the controlled device. The host computer is used to communicate with the adjustment module.

[0037] The drive module includes a control signal execution unit, which executes the control signals issued by the regulation module; and an execution feedback unit, which feeds back the execution results of the controlled equipment to the regulation module.

[0038] Specifically, the control signal execution unit can be a driver. The main functions of a driver are: 1. Executing control signals: The driver drives the behavior of the actual equipment and adjusts the system output (e.g., temperature, pressure, flow rate, position, etc.) based on the control signals (such as adjustment values) output by the PID controller. Control signals typically originate from the PID controller's calculations, are appropriately conditioned, and then transmitted to the driver. The driver adjusts the controlled object according to these signals. Example: In a temperature control system, the output signal of the PID controller might be a signal to adjust the heating power. The driver (e.g., the controller of an electric heater) adjusts the heater's output based on this signal, thereby changing the heater's power to control the temperature. 2. Regulating actuators: The driver is responsible for controlling the actions of various actuators, including motors, valves, electric heaters, pumps, fans, etc. The driver's role is to precisely adjust these components according to the instructions of the PID controller, thereby changing the state of the controlled variable. The actions of the actuators affect the state of the controlled object through physical means, thus affecting the system output. Example: For a level control system, the output signal of the PID controller might be to adjust the pump's speed. The driver controls the pump's operation based on this signal to ensure the liquid level is maintained at the set value. For a heating system, the output of a PID controller might control the power of an electric heater, while the driver adjusts the heater's power output to maintain the set temperature. 3. Providing precise regulation and control: The driver is responsible for executing precise actions according to the PID controller's instructions, enabling the system to quickly and accurately reach the target value. The driver's performance directly affects the system's response speed, stability, and accuracy. High-precision drivers can reduce system errors and oscillations, improving control effectiveness. Example: In a position control system, the control signal output by the PID controller might control the position of an electric actuator. The driver precisely adjusts the movement of the motor or hydraulic system based on the signal to achieve precise position control. 4. Real-time response and adjustment: The driver needs to adjust the state of the actuator based on the real-time output of the PID controller. This requires the driver to have a fast response capability, able to process the control signal from the PID controller in real time, and execute the corresponding control actions promptly. For example, under dynamic load changes, the PID controller's output signal will adjust according to real-time errors, and the driver needs to respond quickly to these changes to ensure the system's continuous and stable operation. Example: In a temperature control system, when the system temperature suddenly drops, the PID controller increases the power output signal of the heater, and the driver immediately adjusts the power output of the heater in order to quickly restore the temperature to the set value.

[0039] The execution feedback unit can send the actuator's execution result as a feedback signal to the control module or host computer, informing the system of the current execution status or fault information. This is crucial for real-time adjustment of control strategies and protection of system safety. For example, if the actuator fails to respond as expected (e.g., motor overload or valve blockage), it may send fault information to the PID controller. The PID controller can then adjust its output based on the feedback or activate alarm or protection mechanisms. Example: In a level control system, the actuator (such as a pump) will report the current level change or the pump's status (whether it is operating normally). If the actuator detects a pump malfunction or failure, it will report this to the control system, and the PID controller may activate an alarm and adjust the control strategy.

[0040] The adjustment module includes: a signal generation unit, which generates control signals and sends them to the drive module; an error elimination unit, which eliminates errors in the control signals; an adjustment feedback unit, which feeds back the control results to the host computer; and an information receiving unit, which receives the execution results fed back by the drive module and the control information sent by the host computer.

[0041] Specifically, the signal generation unit can generate control signals based on information uploaded by maintenance personnel and the attribute information of the controlled equipment, and send the control signals to the drive module. The drive module can then drive the controlled equipment according to the control signals. The error elimination unit's error elimination includes: a proportional term (P): proportional to the current error, reflecting the current deviation of the system, mainly used to accelerate system response; an integral term (I): accumulating the error to eliminate the system's steady-state error (long-term existing error); and a differential term (D): responding to the rate of change of the error, predicting future error changes, reducing system overshoot, and improving dynamic response. The adjustment feedback unit specifically feeds back the execution results to the host computer, facilitating manual intervention by maintenance personnel based on the execution results. The information receiving unit specifically receives information uploaded by maintenance personnel from the host computer and the execution results fed back by the drive module.

[0042] The host computer includes a data monitoring unit, which is used to acquire the execution results fed back by the adjustment module in real time; a parameter optimization unit, which is used to optimize the control parameters of the dual-channel PID controller based on the execution results; and a human-machine interaction unit, which is used to assist maintenance personnel in operating the dual-channel PID controller.

[0043] Specifically, the data monitoring unit is used for: 1. Monitoring: The host computer monitors various data in the PID control system in real time, such as target value (setpoint), actual value (process variable), control quantity (output signal), and various parameters of the PID controller (such as proportional, integral, and derivative gain). 2. Data acquisition: The host computer can periodically or on-demand collect process data (such as temperature, pressure, flow rate, etc.) of the system through data communication with the slave computer. This data is usually acquired through sensors and then transmitted to the host computer through communication protocols. Functional examples: Monitoring the status of the controlled object, such as whether the temperature, liquid level, or speed has reached the preset value. Displaying real-time data of the system, such as the error between the actual temperature and the setpoint. The parameter optimization unit is used for: 1. Parameter setting and adjustment: The host computer usually provides a user-friendly interface, allowing users to set and adjust the gain parameters of the PID controller (such as proportional gain Kp, integral gain Ki, and derivative gain Kd). Through the host computer software, operators can dynamically adjust the system based on the response to optimize control performance. 2. Self-adjustment and Automatic Optimization: Some advanced PID control systems can automatically adjust PID parameters via a host computer (e.g., adaptive PID control). The host computer can automatically optimize PID parameters based on the real-time performance of the control system, resulting in a more accurate and stable system response. Functional Example: Adjusting PID parameters in real time through the host computer interface to optimize system response. Setting initial parameters and adjusting them as needed during operation. The human-machine interface unit is specifically used for: 1. Remote Monitoring and Control: Through the host computer software, operators can monitor and operate the PID control system from a remote location. Modern host computer systems typically support remote control and data access via network connections (such as Ethernet, Wi-Fi, etc.). 2. Remote Adjustment: If the system needs to adjust PID parameters or set target values, the operator can make adjustments remotely through the host computer without directly contacting the lower-level devices. Functional Example: Controlling PID parameters and even adjusting control targets via a remote PC or mobile device. Using the host computer interface to view the operating status and alarm information of remote devices.

[0044] In another embodiment, such as Figure 2 The diagram shown illustrates the principle of a dual-channel PID controller. Figure 2IC18 is an ARM-based MCU (Microcontroller Unit). Analog signals from the controlled device are input through pins 3 and 4 of P8. These signals are then filtered and amplified by an input signal filtering and amplification circuit composed of C9, C43, R29, C13, C20, C10, R69, C41, R70, IC14, C41, R70, R30, and C90 before being transmitted to pin 18 of IC18 for AD conversion to obtain the specific numerical value of the controlled analog signal. The current value of the controlled device is input through pins 1 and 2 of P8. It is then filtered and amplified by an input signal filtering and amplification circuit composed of R24, C4, R60, R61, R59, D27, D28, R61, R2, R3, C7, IC1C, R1, and C2 before being transmitted to pin 26 of IC18 for AD conversion to obtain the current value of the controlled device. The operating voltage value of the controlled device is input through P2 and then transmitted through an AC voltage transformer T7 in conjunction with R80, R81, R89, and C6. 5. The obtained AC voltage signal is then filtered and amplified by the input signal filtering circuit composed of R44, R45, D22, D25, R93, R96, IC5B, IC5A, C74, R101, R103, and C53, and transmitted to pin 21 of IC18 for AD conversion to obtain the AC power supply voltage value of the controlled device; the pulse signal output from pin 41 of IC18, which is isolated and sensed by R117, BG14, and T8, is output from P19. The leakage current status of the controlled equipment during operation is input through P3, processed by C63, R84, IC11B, BG1, R91, and C66, and then transmitted to pin 13 of IC18 for AD conversion. Communication data output from pins 42 and 43 of IC18 is isolated by R10, R42, R50, and IC2, IC4, and IC6, then converted into an RS485 signal by R18, R22, R27, and IC8 and output through P1, allowing remote connection to a host computer. The MCU, IC18, serves as the control core. Its function is to perform fuzzy PID calculations based on the analog signals from the two controlled devices, combined with the power supply voltage and operating current of each device, to calculate the actual output control value and control the drivers of the controlled devices. This ensures that the analog signals of the controlled devices remain stable at the set values ​​to meet industrial production needs. Simultaneously, it monitors and protects against leakage current issues during operation.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A dual-channel PID controller, characterized in that, The dual-channel PID controller includes: A drive module is connected to an adjustment module and a controlled device, and the drive module is used to drive the controlled device; the drive module has two data sets. An adjustment module is connected to a host computer and is used to adjust the controlled device. A host computer is used to communicate with the adjustment module.

2. The dual-channel PID controller as described in claim 1, characterized in that, The driving module includes: A control signal execution unit is used to execute the control signals issued by the adjustment module.

3. The dual-channel PID controller as described in claim 2, characterized in that, The driver module also includes: An execution feedback unit is provided, which is used to feed back the execution result of the controlled device to the adjustment module.

4. The dual-channel PID controller as described in claim 1, characterized in that, The adjustment module includes: A signal generation unit is used to generate control signals and send the control signals to the drive module.

5. The dual-channel PID controller as described in claim 4, characterized in that, The adjustment module further includes: An error elimination unit is provided to eliminate errors in the control signal.

6. The dual-channel PID controller as described in claim 5, characterized in that, The adjustment module further includes: An adjustment feedback unit is used to feed back the control results to the host computer.

7. The dual-channel PID controller as described in claim 6, characterized in that, The adjustment module further includes: An information receiving unit is used to receive the execution results fed back by the driving module and the control information sent by the host computer.

8. The dual-channel PID controller as described in claim 1, characterized in that, The host computer includes: A data monitoring unit is used to obtain the execution results fed back by the adjustment module in real time.

9. The dual-channel PID controller as described in claim 8, characterized in that, The host computer also includes: A parameter optimization unit is used to optimize the control parameters of the dual-channel PID controller based on the execution results.

10. The dual-channel PID controller as described in claim 9, characterized in that, The host computer also includes: The human-machine interaction unit is used to assist maintenance personnel in operating the dual-channel PID controller.

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