Stepping control device for air supply of air conditioner

Abstract

The utility model relates to the technical field of stepping motor control devices, in particular to a stepping control device for air supply of an air conditioner. A touch screen with the model of TPC7022NI is selected, a man-machine interaction module, an interval setting module and a calculation module are integrated through a parameter editing function of the touch screen, and different stepping intervals and reaction time are set for a stepping motor by setting the interval setting module and the calculation module. The difference between the numerical value of the measured object and the set value is compared with the stepping interval, the appropriate reaction time is selected, the stepping time of the stepping motor is changed, in a large lag system, when the difference between the numerical value of the measured object and the set value is small, the large reaction time is selected, and the stepping time of the stepping motor is changed. The change rate of a measured value is delayed, the overshoot phenomenon is avoided, and the temperature control of the air conditioning system is more accurate. The problem that in a large lagging system of air supply of an air conditioner, the time needed by a controlled object to perform corresponding performance is long is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of stepper motor control devices, in particular to a stepper control device for air supply of an air conditioner. Background Art

[0002] The stepper control scheme is a way to control the stepper motor using analog quantity. Analog quantity control of stepper motor is a technology that uses analog signals to control the operation of stepper motor. In this control method, analog signals (such as voltage or current) are usually used to specify the speed, position or torque of the stepper motor. Analog quantity control can achieve precise control of the motor torque, speed or position by adjusting the size of the input signal.

[0003] However, the step time is fixed, and the analog output can only change at a fixed rate, so it is not very universal. In a large lag system, when the output of the controller changes, it takes a long time for the controlled object to respond accordingly. During this time, the controller may change again, which can easily cause the actual value to fluctuate around the set value. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a stepping control device for air-conditioning air supply, which solves the problem that in an air-conditioning air supply system with a large lag, a controlled object needs a long time to make a corresponding performance.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A stepping control device for air supply of an air conditioner, comprising a stepping motor for air supply, and further comprising:

[0007] A human-computer interaction module, which is used to input parameters to the controller module, the interval setting module and the calculation module according to customer needs;

[0008] A controller module, the controller module is used to control the output parameters of the air conditioner stepper motor;

[0009] An interval setting module, wherein the interval setting module is used to set a plurality of step intervals for the stepping motor through the human-computer interaction module, wherein the plurality of step intervals respectively correspond to different differences between a current value and a set value of the controlled object, and also includes reaction times corresponding to the plurality of step intervals;

[0010] The calculation module is used to calculate the difference between the current value of the controlled object and the set value, and select the stepping interval and reaction time of the stepping motor through the controller module according to the size of the difference.

[0011] Preferably, a plurality of the step intervals include a step dead zone corresponding to an allowable error of the set value.

[0012] Preferably, the interval lengths of several step intervals are the same.

[0013] Preferably, the model of the human-computer interaction module is TPC7022NI.

[0014] Preferably, the model of the controller module is POL638.

[0015] Preferably, the length of the step interval is inversely proportional to the reaction time.

[0016] Compared with the prior art, the utility model provides a stepping control device for air supply of an air conditioner, which has the following beneficial effects:

[0017] 1. By setting the interval setting module and the calculation module, different step intervals and reaction times are set for the stepper motor, so as to compare the gap between the value of the measured object and the set value with the step interval, so as to select the appropriate reaction time, thereby changing the step time of the stepper motor. In a large lag system, when the gap between the value of the measured object and the set value is small, a larger reaction time is selected to slow down the rate of change of the measured value, avoid overshoot, and make the air-conditioning system more accurate in temperature control.

[0018] 2. By selecting the touch screen model TPC7022NI and using its built-in parameter editing function, the controller module control parameters and stepper motor parameters can be personalized according to customer needs to integrate the human-computer interaction module, interval setting module and calculation module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 This is a structural block diagram of the stepping control device for air supply of the air conditioner of the utility model.

[0021] Figure 2 It is a flowchart of the working of the stepping control device of the utility model;

[0022] Figure 3 This is a schematic diagram of the parameter setting interface of the interval setting module of the utility model.

[0023] In the figure: 1. stepper motor; 2. human-computer interaction module; 3. controller module; 4. interval setting module; 5. calculation module. DETAILED DESCRIPTION

[0024] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0025] In the air conditioning system, taking temperature control as an example, when the indoor temperature needs to be reduced from 27 degrees Celsius to 23 degrees Celsius, theoretically, the cold water needs to be opened by 50%, and a certain amount of cold water can be delivered with the corresponding step time to achieve cooling. Since there is a long lag in heat exchange and air supply and return after opening, the temperature may not change in the next calculation cycle, and then the cold water valve will generally be opened further. When the temperature begins to drop, the cooling output is actually much larger than required. At this time, the cold water delivery volume needs to be reduced again. This cycle will prevent the cold water from being stabilized at a suitable output position.

[0026] Figure 1-Figure 3 In one embodiment of the utility model, by setting the stepping intervals and reaction times of multiple stepping motors, it is possible to select a suitable stepping interval and reaction time for the stepping motor according to the difference between the current target value and the set value of the measured object, thereby improving the control accuracy. To this end, the utility model provides a stepping control device for air supply of an air conditioner, comprising a stepping motor 1 for air supply, and also comprising a human-computer interaction module 2 for inputting parameters to a controller module 3, an interval setting module 4 and a calculation module 5 according to customer needs, thereby setting different parameters for the controller module 3, the interval setting module 4 and the calculation module 5 according to customer needs; the interval setting module 4 is used to control the air supply through the human-computer interaction module 2. Block 2 sets a number of stepping intervals for the stepper motor 1, and the number of stepping intervals respectively correspond to different differences between the current value and the set value of the controlled object, and also include reaction times corresponding to the number of stepping intervals; the calculation module 5 is used to calculate the difference between the current value and the set value of the controlled object, and select the stepping interval and reaction time of the stepper motor 1 through the controller module 3 according to the size of the difference. The controller module 3 is used to control the output parameters of the air-conditioning stepper motor 1, such as the speed, position or torque of the stepper motor 1. In actual use, the current value of the controlled object will be obtained through the corresponding sensor, so that the corresponding stepping interval and reaction time will be selected for the stepper motor 1 according to the calculated difference through the calculation module 5.

[0027] As the preferred technical solution of this embodiment, the model of the human-computer interaction module 2 is TPC7022NI, Kunlun Technology TPC7022NI, which can quickly develop and customize functions that meet specific equipment according to user needs, support serial communication, Modbus communication, Ethernet communication and other communication methods, and can easily read and write data of various PLCs, intelligent instruments, intelligent modules, inverters and hundreds of other industrial control equipment. It can also realize complex process control such as loops, jumps, judgments, interrupts, etc., can be used as a terminal display, read the displays of each communication slave station for human-computer interaction, and can also write logical functions and use it as a PLC without IO contacts. At the same time, the interval setting module 4 and the calculation module 5 are also integrated on the TPC7022NI.

[0028] As a preferred technical solution of this embodiment, several of the step intervals include a step dead zone corresponding to the allowable error of the set value. When the measured object such as temperature is in the step dead zone, it is necessary to select a reaction time corresponding to the step dead zone to control the rate of change of temperature.

[0029] As a preferred technical solution of this embodiment, the interval lengths of several step intervals are the same, so as to facilitate the setting of the interval length.

[0030] As the preferred technical solution of this embodiment, the model of the controller module 3 is POL638. Siemens POL638 is a device designed for HVAC, refrigeration and district heating. It belongs to the Climatix product series and can be freely programmed according to user needs.

[0031] As a preferred technical solution of this embodiment, the length of the step interval is inversely proportional to the reaction time, that is, the larger the interval length of the step dead zone, the smaller the corresponding reaction time. When the temperature of the object under test approaches the set value, the corresponding length of the step interval becomes smaller and smaller, while the step time becomes longer and longer, so as to reduce the rate of temperature change and make the actual temperature slowly approach the set temperature.

[0032] Taking indoor temperature control as an example, the simplest cold water valve is used to control the cold water flow to lower the air temperature. The cold water valve (actuator, relative to the stepper motor 1 in the air conditioning system) is opened at 0-100%, the current air temperature is 35°C, and the target temperature is 23°C. As the set value, ±2°C is generally used as a stepping interval, which is usually called the stepping dead zone. Customers can accept the indoor temperature within this range. The logical definition is that it is recommended that the controller module 3 no longer changes within this range. When the difference between the current value and the set value is greater than 4, it is cooling here. When the current temperature is greater than 23+4=27, a faster stepping time is used. When the temperature is less than 23+2, a normal stepping time is used to slowly approach the set value, and a stable controller module 3 output parameter is adjusted, such as Figure 2 As shown in the figure, two step intervals are set, named as the fast response interval and the dead zone interval. Figure 2 The current value is the measured value of the indoor temperature, such as 35℃, and the set value is 23℃. At this time, the difference between the two is 12℃. Select the response time corresponding to the fast response interval, such as Figure 3 As shown in the figure, it is the parameter setting interface and related parameters of the actual application. The step dead zone and the fast step interval are two step intervals, and the step time and the fast step time are two corresponding step times.

[0033] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stepping control device for air supply of an air conditioner, comprising a stepping motor (1) for air supply, characterized in that: Also includes: A human-computer interaction module (2), wherein the human-computer interaction module (2) is used to input parameters to the controller module (3), the interval setting module (4) and the calculation module (5) according to customer requirements; A controller module (3), the controller module (3) being used to control output parameters of the air-conditioning stepping motor (1); An interval setting module (4), the interval setting module (4) is used to set a plurality of step intervals for the stepping motor (1) through the human-machine interaction module (2), the plurality of step intervals respectively corresponding to different differences between a current value and a set value of a controlled object, and also including reaction times corresponding to the plurality of step intervals; A calculation module (5) is used to calculate the difference between the current value of the controlled object and the set value, and select the stepping interval and reaction time of the stepping motor (1) through the controller module (3) according to the size of the difference.

2. A step control device for air supply of an air conditioner according to claim 1, characterized in that: Several of the step intervals include a step dead zone corresponding to the allowable error of the set value.

3. The stepping control device for air supply of an air conditioner according to claim 1, characterized in that: The interval lengths of the plurality of step intervals are the same.

4. The stepping control device for air supply of an air conditioner according to claim 1, characterized in that: The model of the human-computer interaction module (2) is TPC7022NI.

5. The stepping control device for air supply of an air conditioner according to claim 1, characterized in that: The model of the controller module (3) is POL638.

6. The stepping control device for air supply of an air conditioner according to claim 1, characterized in that: The length of the step interval is inversely proportional to the reaction time.

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