A control method and system for a CDU temperature regulation actuator

Abstract

The present invention provides a control method and system for a CDU temperature regulation actuator, which relates to the technical field of actuator control in a data center CDU system. The present invention determines the set opening value of the actuator by obtaining the current liquid supply temperature, the set temperature, and the current opening value of the actuator, and calculates the opening difference. According to the comparison results of the opening difference with the preset threshold and the precision value, the actuator enters the fast adjustment program or the slow adjustment program respectively. The upper limit times of fast adjustment and slow adjustment are dynamically calculated based on the difference between the current liquid supply temperature and the set temperature, rather than fixed values, so as to more accurately adapt to different heat load conditions. In addition, the method also incorporates a self-learning mechanism to correct the adjustment rate based on historical adjustment data, further optimizing the control strategy. Through this dynamic calculation of the adjustment times and the segmented adjustment strategy, the present invention significantly improves the control precision and adaptability of the actuator, reduces mechanical wear, and extends the service life of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of data center CDU system actuator control, and in particular to a control method and system for a CDU temperature adjustment actuator. Background Art

[0002] As the core infrastructure of the information age, data centers are responsible for the storage, processing and transmission of massive amounts of data. Their stable operation is crucial to all areas of modern society. With the rapid development of information technology, the scale of data centers continues to expand, and the requirements for cooling systems are becoming higher and higher. As a key component of data center liquid cooling technology, the CDU (Cooling Distribution Unit) system is responsible for effectively distributing the cooling medium to each server cabinet or device to ensure that the equipment operates in a suitable temperature environment and prevent performance degradation, failures, and even equipment damage caused by overheating.

[0003] The temperature control actuator is a key component in the liquid cooling system, which is used to accurately control the flow of coolant to maintain the system operating within the set temperature range. It controls the flow of coolant by adjusting the opening of the valve, thereby achieving temperature regulation in scenarios such as data centers and industrial equipment. Existing temperature control actuators usually use PID control algorithms, which detect the deviation between the actual temperature and the set temperature through sensors, and then adjust the opening of the actuator according to the deviation. In addition, it is possible to combine proportional control, integral control, and differential control to optimize the regulation process.

[0004] In the existing control methods, the control accuracy of the actuator is affected by many factors, including improper mechanical adjustment, feedback device failure, controller problems, input signal interference, drive component wear, and failure of the protection mechanism. For example, improper mechanical limit adjustment may cause the valve to not be fully opened or closed, thereby affecting the overall control accuracy of the system. In addition, sensor failure or reduced accuracy will also cause inaccurate signals transmitted to the controller, which will cause malfunctions of the actuator. Due to the deviation between the actual control and the ideal condition, the actuator cannot always reach the set accuracy in some cases, and will be adjusted repeatedly, accelerating mechanical wear and failure. For example, wear or relaxation of the drive sleeve and synchronous belt will cause noise and transmission errors, causing problems with the actuator's response time and position control. Specifically, in the existing method, the valve position variable of each run of the adjustment program is not reasonably matched with the speed of the actuator, resulting in a fast turn correction amount greater than the deviation, so the actuator returns to the carriage for correction in a fast turn mode. For the same reason, the reverse correction amount also exceeds the deviation, and ultimately cannot be positioned. Because the software does not limit the number of fast turns, the actuator cannot terminate the current state without the arrival of a new control signal, and it keeps oscillating back and forth, causing fatigue wear of the reduction gear.

[0005] In addition, problems such as overheating or over-torque protection of the motor may also lead to a decrease in the control accuracy of the actuator. Additionally, the existing control methods have poor adaptability to different working conditions and cannot flexibly adjust the regulation strategy according to the actual operating conditions. For example, at high heat loads, the actuator may not be able to quickly respond to temperature changes; while at low heat loads, the actuator may perform unnecessary frequent adjustments.

[0006] It is found that by setting the upper limit number of adjustments, mechanical wear can be avoided to a certain extent, but this method is not applicable to all working conditions. Even in most working conditions, although mechanical wear can be reduced, the impact on the adjustment accuracy is relatively large. SUMMARY OF THE INVENTION

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0008] To this end, a first aspect of the present invention provides a control method for a CDU temperature regulation actuator.

[0009] A second aspect of the present invention provides a control system for a CDU temperature regulation actuator.

[0010] The control method for a CDU temperature regulation actuator provided by the present invention includes:

[0011] Obtaining basic data, where the basic data includes the current liquid supply temperature, the set temperature, and the current opening value of the actuator; determining the set opening value of the actuator corresponding to the set temperature according to the basic data;

[0012] Calculating the opening difference between the set opening value of the actuator and the current opening value of the actuator;

[0013] Comparing the opening difference with a first threshold and a set precision value; wherein, the first threshold is greater than the set precision value;

[0014] When the opening difference is greater than the first threshold, entering a fast adjustment program, wherein, within at least part of the adjustment time, the temperature regulation actuator rotates quickly at a first rate;

[0015] After each quick rotation, re-compare the opening difference with the first threshold and the set precision value; if the opening difference is still greater than the first threshold, perform the quick rotation operation again, and accumulate the number of quick rotations until the opening difference is less than the first threshold or the number of quick rotations reaches a first set number and then exit the fast adjustment program;

[0016] According to the current opening value of the actuator after exiting the fast adjustment program, compare the opening difference with the set precision value;

[0017] When the opening difference is greater than the set precision value, enter the slow adjustment program. During at least part of the adjustment time, the temperature adjustment actuator rotates slowly at a second rate, and the second rate is less than the first rate;

[0018] After each slow rotation is executed, compare the opening difference with the set precision value again; if the opening difference is still greater than the set precision value, execute the slow rotation operation again and accumulate the number of slow rotations until the opening difference is less than the set precision value or the number of slow rotations reaches the second set number and then exit the slow adjustment program;

[0019] Among them, the first set number and the second set number are calculated according to the current liquid supply temperature and the set temperature.

[0020] According to the control method for the temperature adjustment actuator of the above technical solution of the present invention, the following additional technical features may also be included:

[0021] In the above technical solution, the calculation method of the first set number includes:

[0022]

[0023] Among them, represents the first set number; represents the proportional coefficient of fast adjustment; represents the basic number of fast adjustments; represents the absolute value of the difference between the current liquid supply temperature and the set temperature.

[0024] In the above technical solution, the calculation method of the second set number includes:

[0025]

[0026] Among them, represents the second set number; represents the proportional coefficient of slow adjustment; represents the basic number of slow adjustments; represents the absolute value of the difference between the current liquid supply temperature and the set temperature.

[0027] In the above technical solution, the first rate is the maximum rate set by the fast adjustment program; the second rate is the maximum rate set by the slow adjustment program;

[0028] In the fast adjustment program and the slow adjustment program, the movement trajectory of the temperature adjustment actuator each time it moves includes a uniformly accelerating section, a uniformly moving section, and a uniformly decelerating section;

[0029] Among them, in the fast adjustment program, the uniformly moving section is the trajectory section rotating at the first rate; in the slow adjustment program, the uniformly moving section is the trajectory section rotating at the second rate.

[0030] In the above technical solution, it further includes:

[0031] After completing the opening adjustment of the current actuator, correct the set first rate and second rate according to the deviation between the set opening value and the termination opening value of the actuator in the most recent N times, and use the corrected first rate and second rate for the next opening adjustment.

[0032] In the above technical solution, the method for correcting the first rate includes:

[0033]

[0034] Wherein, represents the correction result of the first rate; represents the first rate set this time; represents the self-learning coefficient of the first rate; represents the termination opening value of the actuator in the nth adjustment among the most recent N opening adjustments; represents the set opening value of the actuator set in the nth adjustment among the most recent N opening adjustments;

[0035] The method for correcting the second rate includes:

[0036]

[0037] Wherein, represents the correction result of the second rate; represents the second rate set this time; represents the self-learning coefficient of the second rate.

[0038] In the above technical solution, the standard opening range of the temperature adjustment actuator is 0-90°, when the opening of the temperature adjustment actuator is 0°, it corresponds to the fully closed state of the CDU liquid supply valve, and when the opening of the temperature adjustment actuator is 90°, it corresponds to the fully open state of the CDU liquid supply valve;

[0039] At least two limit travel switches are provided on the temperature adjustment actuator, one limit travel switch is provided at the -2.5° position, and the other limit travel switch is provided at the 92.5° position, so as to expand the actual opening range of the temperature adjustment actuator to -2.5-92.5°.

[0040] In the above technical solution, the value range of the set precision value is 0.2-1°;

[0041] The first threshold is M times the set precision value, and M is not less than 2.

[0042] In the above technical solution, it further includes:

[0043] Obtain the temperature of the motor winding inside the temperature regulating actuator. When the temperature of the motor winding exceeds the temperature threshold, the control system interlocks to stop the motor.

[0044] The present invention also provides a control system for a CDU temperature regulating actuator. The control system uses the control method described in any one of the above technical solutions to adjust the opening degree of the temperature regulating actuator to control the corresponding rotation of the liquid supply valve, so as to make the liquid supply temperature of the CDU system approach the set temperature;

[0045] The control system includes:

[0046] A data acquisition module for collecting and processing basic data;

[0047] A precise positioning module for calculating the opening difference according to the basic data, comparing the opening difference with the first threshold and the set precision value respectively, judging whether the opening difference meets the precision requirement according to the comparison result, and selecting a fast adjustment program or a slow adjustment program to adjust the opening degree of the actuator according to the deviation degree when the precision requirement is not met; among them, both the fast adjustment program and the slow adjustment program have an upper limit on the number of adjustments, and the upper limit on the number of adjustments is calculated according to the current liquid supply temperature and the set temperature;

[0048] A self-learning module for correcting the set first rate and second rate according to the deviation between the set opening value and the termination opening value of the actuator in the most recent N times after completing the opening adjustment of the actuator for the current time, and using the corrected first rate and second rate for the next opening adjustment.

[0049] In summary, due to the adoption of the above technical features, the beneficial effects of the present invention are:

[0050] The control method of the present invention can automatically adjust the adjustment strategy according to the deviation between the current liquid supply temperature and the set temperature by dynamically calculating the upper limit number of fast adjustment and slow adjustment, thereby significantly improving the control precision and adaptability of the temperature regulating actuator and avoiding...

[0051] First, the calculation method of the dynamic adjustment times enables the actuator to flexibly adjust the adjustment times when facing different heat loads, avoiding problems such as inaccurate temperature control and mechanical wear caused by insufficient or excessive adjustment times. Secondly, the adoption of the segmented adjustment strategy, that is, rapid adjustment is used for rapid response to large temperature deviations, and slow adjustment is used for fine adjustment, ensures that the temperature can be stably maintained within the set range, further enhancing the stability of the system. In addition, the introduction of the self-learning and deviation correction mechanism enables the system to dynamically adjust the adjustment rate according to historical data, optimize the adjustment strategy, further improving the adjustment accuracy and the adaptability of the system. At the same time, by real-time monitoring the deviation between the supply liquid temperature and the set temperature, the system can timely adjust the adjustment strategy, improving the response speed. Moreover, a temperature control switch is set to prevent the motor from overheating and being damaged, enhancing the safety and reliability of the system. Generally speaking, the control method of the present invention effectively solves the problems such as insufficient adjustment accuracy and mechanical wear existing in the prior art, improves the performance and service life of the temperature adjustment actuator, and has important practical significance for application scenarios such as data center cooling systems.

[0052] The additional aspects and advantages of the present invention will become obvious in the following description part, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above and / or additional aspects and advantages of the present invention will become obvious and be easily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0054] Figure 1 is a flowchart of a control method for a CDU temperature adjustment actuator according to an embodiment of the present invention;

[0055] Figure 2 is a schematic diagram of the installation angle of a limit travel switch in an embodiment of the present invention;

[0056] Figure 3 is a schematic diagram of the valve rotation angle and the position of the limit travel switch in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0057] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0058] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0059] The following refers toFigures 1 to 3 To describe a control method and system for a CDU temperature regulation actuator according to some embodiments of the present invention.

[0060] Some embodiments of the present application provide a control method for a CDU temperature regulation actuator.

[0061] As Figure 1 shown, the first embodiment of the present invention proposes a control method for a CDU temperature regulation actuator. In the CDU system, by adjusting the opening degree of the temperature regulation actuator, the liquid supply valve is correspondingly rotated, so that the liquid supply temperature of the CDU system approaches the set temperature. The temperature regulation actuator shown in the present disclosure includes a servo controller, a motor, a potentiometer, limit travel switches, reduction gears, a temperature control switch, a wiring harness, etc.; the servo controller is provided with a central processing unit, a driver, and a display for human-machine interaction. The water supply temperature of the liquid cooling is compared with the target temperature, and the opening degree of the actuator is calculated using the PID algorithm. The opening degree signal is transmitted to the driver. The driver is connected to the motor through the wiring harness, feeds back the valve opening degree through the potentiometer, and realizes closed-loop control. The system automatically runs through human-machine interaction display on the display and setting the operating parameters of the system.

[0062] Specifically, the system monitors the water supply temperature of the liquid cooling system in real time through a temperature sensor and transmits the temperature data to the servo controller. At the same time, the set target temperature value is also input into the servo controller, usually set through the display for human-machine interaction. After receiving the water supply temperature and the target temperature, the central processing unit in the servo controller performs comparison processing. Based on the deviation between the two, the set opening degree value of the actuator is calculated using the PID algorithm. The PID algorithm comprehensively considers three parameters: proportional (P), integral (I), and derivative (D) to precisely control the opening degree of the actuator and ensure that the water supply temperature can quickly and stably approach the target temperature; specifically, the PID algorithm is well-known to those skilled in the art and will not be elaborated here. The calculated set opening degree value of the actuator is converted into a corresponding opening degree signal and then transmitted to the driver. As a bridge between the actuator and the motor, the driver sends corresponding control instructions to the motor through the wiring harness according to the received opening degree signal to drive the motor to rotate. After receiving the control instruction from the driver, the motor starts to rotate. The output shaft of the motor is connected to the liquid supply valve through a reduction gear. The role of the reduction gear is to reduce the high-speed rotation of the motor, thereby realizing precise control of the valve opening degree. The transmission ratio of the reduction gear determines the relationship between the motor speed and the valve opening degree, enabling the valve to precisely adjust the opening degree within the range of 0-90° (corresponding to the valve opening degree of 0-100%).

[0063] During the opening adjustment process of the valve, the potentiometer continuously detects the actual opening of the actuator / valve and converts this opening value into an electrical signal to feedback to the servo controller. The servo controller compares the opening value feedback by the potentiometer with the set opening value to determine whether it is necessary to further adjust the rotation of the motor, thereby achieving closed-loop control. This closed-loop control method can correct deviations in real time to ensure the accuracy of the valve opening.

[0064] To solve the problems of large mechanical wear and insufficient control accuracy in traditional control methods, the control method for the CDU temperature adjustment actuator proposed in this disclosure includes the following steps S1 - S7.

[0065] S1. Obtain basic data, where the basic data includes the current liquid supply temperature, the set temperature, and the current opening value of the actuator; determine the set opening value of the actuator corresponding to the set temperature according to the basic data.

[0066] Specifically, the set opening value of the actuator can be obtained according to the above PID algorithm. The liquid supply temperature refers to the actual temperature of the liquid in the main pipeline of the CDU system, and the set temperature is the target temperature of the liquid in the main pipeline of the CDU system.

[0067] S2. Calculate the opening difference between the set opening value of the actuator and the current opening value of the actuator. The opening difference is the opening value that the actuator needs to adjust.

[0068] S3. Compare the opening difference with a first threshold and a set precision value; where the first threshold is greater than the set precision value.

[0069] It can be understood that when the opening difference is less than the set precision value, it means that the current opening value of the actuator has basically reached the set opening value of the actuator. Even if there is a deviation, the degree of deviation meets the accuracy adjustment requirements and no further adjustment is required.

[0070] In some embodiments, the value range of the set precision value is 0.2 - 1°; the first threshold is M times the set precision value, and M is not less than 2. In a specific embodiment, the set precision value is set to 0.5. It can be understood that when the precision value is set to 0.5°, the actual precision interval is [-0.5°, 0.5°]; when the first threshold is set to three times the precision value, the first threshold is ±1.5°. For the convenience of comparison, the absolute value of the opening difference is taken to compare with the first threshold and the set precision value.

[0071] S4. When the opening difference is greater than the first threshold, control the temperature adjustment actuator to enter the fast adjustment program. In the fast adjustment program, the temperature adjustment actuator rotates rapidly at a first rate during at least part of the adjustment time, and the first rate is the maximum rate set in the fast adjustment program.

[0072] S5. After each rapid rotation, based on the updated current opening value of the actuator, compare the opening difference with the first threshold and the set precision value again. If the opening difference is still greater than the first threshold, perform the rapid rotation operation again and accumulate the number of rapid rotations until the opening difference is less than the first threshold or the number of rapid rotations reaches the first set number, and then exit the fast adjustment program. The first set number is calculated according to the current liquid supply temperature and the set temperature.

[0073] In some embodiments, since rapid adjustment is mainly used to quickly respond to large temperature deviations, it has been found that its upper limit of the number of times should be positively correlated with the temperature deviation. The greater the temperature deviation, the higher the upper limit of the allowable number of rapid adjustments to ensure that the system can quickly adjust to a range close to the target temperature.

[0074] In a specific embodiment, the calculation method of the first set number includes:

[0075]

[0076] where represents the first set number; represents the proportionality coefficient of rapid adjustment; represents the basic number of rapid adjustments; represents the absolute value of the difference between the current liquid supply temperature and the set temperature.

[0077] S6. According to the current opening value of the actuator after exiting the fast adjustment program, compare the opening difference with the set precision value. Similarly, when the opening difference is less than the set precision value, it means that the current opening value of the actuator has basically reached the set opening value of the actuator. Even if there is a deviation, the degree of deviation meets the precision adjustment requirements and no further adjustment is required.

[0078] S7. When the opening difference is greater than the set precision value, control the temperature adjustment actuator to enter the slow adjustment program. In the slow adjustment program, the temperature adjustment actuator rotates slowly at the second rate during at least part of the adjustment time. The second rate is the maximum rate set in the slow adjustment program, and the second rate is less than the first rate.

[0079] S8. After each slow rotation, based on the updated current opening value of the actuator, compare the opening difference with the set precision value again. If the opening difference is still greater than the set precision value, perform the slow rotation operation again and accumulate the number of slow rotations until the opening difference is less than the set precision value or the number of slow rotations reaches the second set number, and then exit the slow adjustment program. The second set number is calculated according to the current liquid supply temperature and the set temperature.

[0080] Specifically, the slow adjustment is a fine adjustment for gradually approaching the target temperature within a small range based on the fast adjustment. Since the impact of the slow adjustment is relatively small, the calculation of its upper limit times can more smoothly depend on the temperature deviation.

[0081] In some embodiments, the calculation method of the second set number of times includes:

[0082]

[0083] Wherein, represents the second set number of times; represents the proportionality coefficient of the slow adjustment; represents the basic slow adjustment number of times; represents the absolute value of the difference between the current liquid supply temperature and the set temperature.

[0084] Due to the different scales of different CDU systems and the parameters of the temperature adjustment actuators used, the proportionality coefficient of the fast adjustment and the proportionality coefficient of the slow adjustment in the above embodiments can be calibrated according to the response characteristics of the actual system and historical operation data. Specifically, appropriate values can be determined through experimental methods such as the Ziegler-Nichols method. The basic slow adjustment number of times and the basic fast adjustment number of times are both set basic values, such as 3 times, 4 times, etc.

[0085] It should be noted that the fast and slow referred to in this disclosure are relative concepts, and based on the comparison relationship between the first rate and the second rate, the degree of fast and slow can be clearly known, and there is no unclear problem.

[0086] In the fast adjustment program and the slow adjustment program, the movement trajectory of the temperature adjustment actuator each time it moves includes a uniformly accelerating section, a uniformly moving section, and a uniformly decelerating section; specifically, in the fast adjustment program, the uniformly accelerating section is the stroke section where the speed uniformly accelerates from 0 to the first rate, the uniformly moving section is the trajectory section rotating at the first rate, and the uniformly decelerating section is the section where the speed uniformly decelerates from the first rate to 0. The sum of the strokes of the three sections is the total stroke of a single fast adjustment action in the fast adjustment program. Similarly, in the slow adjustment program, the uniformly accelerating section is the stroke section where the speed uniformly accelerates from 0 to the second rate, the uniformly moving section is the trajectory section rotating at the second rate, and the uniformly decelerating section is the section where the speed uniformly decelerates from the second rate to 0. The sum of the strokes of the three sections is the total stroke of a single slow adjustment action in the slow adjustment program. Note that the unit of the above stroke is usually an angle. Among them, the acceleration of the accelerating section, the deceleration of the decelerating section, and the speeds of the uniformly moving section (i.e., the first rate and the second rate) can all be set on the human-machine interaction page, and among them, the first rate and the second rate have a particularly obvious impact on the adjustment accuracy.

[0087] In some embodiments, after each opening adjustment is completed, self-learning can also be performed. The self-learning method includes:

[0088] After completing the opening adjustment of the actuator for the current time, correct the set first rate and second rate according to the deviation between the set opening value and the termination opening value of the actuator in the most recent N times, and use the corrected first rate and second rate for the next opening adjustment. Herein, the termination opening value of the actuator is the actual opening position of the actuator after the opening adjustment.

[0089] In a specific embodiment, the method for correcting the first rate includes:

[0090]

[0091] wherein, represents the correction result of the first rate; represents the first rate set for this time; represents the self-learning coefficient of the first rate; represents the termination opening value of the actuator in the nth adjustment among the most recent N opening adjustments; represents the set opening value of the actuator set in the nth adjustment among the most recent N opening adjustments;

[0092] The method for correcting the second rate includes:

[0093]

[0094] wherein, represents the correction result of the second rate; represents the second rate set for this time; represents the self-learning coefficient of the second rate.

[0095] The self-learning coefficient of the above first rate and the self-learning coefficient of the second rate can be the same or different. In a specific embodiment, both are taken as 0.05. The value of N should not be too large or too small. Generally, the value of N is 3 - 5.

[0096] In some embodiments, the self-learning further includes an initial verification process as follows:

[0097] When the actuator is powered on for the first time, it needs to perform a full stroke, moving from 0° to 90°, and then from 90° to 0°. During this process, the servo controller will identify the driving force by collecting the supply voltage and current of the motor. At the same time, it will feedback the running speed and position of the actuator through the potentiometer, calculate the acceleration, constant speed, and deceleration of the actuator, and then calculate the driving force in combination with the current and voltage of the motor. After identifying the driving force, this value will be used as a judgment criterion. When it is lower than 80%, a system warning will be reported; when it is lower than 70%, a system fault will be reported. The system can be judged whether it is abnormal through this alarm. When it exceeds 120% of this value, a system warning will be reported; when it exceeds 130%, a system fault will be reported. The motor and valve can be judged whether they are normal through this alarm.

[0098] When powered on for the first time, the servo controller will also give the motor a gradually increasing current until there is a position feedback from the potentiometer, indicating that the actuator has overcome the friction and started to move. The control system records this current value and calculates the valve friction through the voltage and current.

[0099] According to the identified driving force and friction, the influence of the friction of different actuators on the system positioning is eliminated.

[0100] In the embodiment of the present disclosure, the standard opening range of the temperature regulating actuator is 0 - 90°. When the opening of the temperature regulating actuator is 0° (corresponding to the electrical signal 4 mA), it corresponds to the fully closed state of the CDU liquid supply valve. When the opening of the temperature regulating actuator is 90° (corresponding to the electrical signal 20 mA), it corresponds to the fully open state of the CDU liquid supply valve.

[0101] In a specific embodiment, as Figure 2 and Figure 3 shown, at least two limit travel switches are set on the temperature regulating actuator. One limit travel switch CLS is set at the -2.5° position, and the other limit travel switch OLS is set at the 92.5° position to expand the actual opening range of the temperature regulating actuator to -2.5 - 92.5°. When the valve opening approaches these limit positions, the limit travel switch will be triggered to cut off the power supply of the motor, preventing the valve from opening or closing excessively, thus playing a role in safety protection. In addition, a certain margin is reserved to provide a buffer for precision adjustment.

[0102] In the present disclosure, as long as the temperature sensor fails and cannot feedback the actual water supply temperature, in order to prevent the data center from overheating, the actuator will automatically run to the maximum opening.

[0103] In some embodiments, it further includes: obtaining the temperature of the motor winding inside the temperature regulating actuator. When the temperature of the motor winding exceeds the temperature threshold, the control system will stop the motor in a chain to prevent the motor from being burned out due to overload. The temperature threshold can be set to 185°C.

[0104] Some other embodiments of the present invention further provide a control system for a CDU temperature regulation actuator. The control system uses the control method described in any of the above embodiments to adjust the opening degree of the temperature regulation actuator to control the corresponding rotation of the liquid supply valve, so as to make the liquid supply temperature of the CDU system approach the set temperature.

[0105] The control system includes: a data acquisition module, a precise positioning module, and a self-learning module.

[0106] The data acquisition module is used to collect and process basic data; the precise positioning module is used to calculate the opening difference according to the basic data, compare the opening difference with the first threshold and the set precision value respectively, judge whether the opening difference meets the precision requirement according to the comparison result, and select a fast adjustment program or a slow adjustment program to adjust the opening degree of the actuator according to the deviation degree when the precision requirement is not met; wherein, both the fast adjustment program and the slow adjustment program have an upper limit of the number of adjustments, and the upper limit of the number of adjustments is calculated according to the current liquid supply temperature and the set temperature; the self-learning module is used to correct the set first rate and second rate according to the deviation between the set opening value and the termination opening value of the actuator in the most recent N times after the opening degree of the actuator is adjusted for the current time, and use the corrected first rate and second rate for the next opening adjustment.

[0107] In a specific embodiment, referring again to Figure 1 , the execution process of the precise positioning module is as follows:

[0108] S101. Judge whether the opening difference is less than the set precision value. If so, exit the precise positioning unit and the adjustment ends; otherwise, proceed to the next step.

[0109] S102. Judge whether the opening difference is greater than the first threshold. If so, enter the fast adjustment program and proceed to the next step; if not, enter the slow adjustment program in step S107.

[0110] S103. The actuator is quickly adjusted once and proceed to the next step.

[0111] S104. Judge whether the opening difference is less than the set precision value. If so, exit the precise positioning unit and the adjustment ends; otherwise, proceed to the next step.

[0112] S105. Judge whether the set opening value of the actuator has changed. If so, set the number of fast rotations to 0 and return to step S101; otherwise, add 1 to the number of fast rotations and proceed to the next step.

[0113] S106. Judge whether the number of fast rotations is greater than or equal to the first set number. If so, proceed to the next step; otherwise, return to step S102.

[0114] S107. Enter the slow adjustment program, and the actuator is slowly adjusted once and proceed to the next step.

[0115] S108. Determine whether the opening difference is less than the set precision value. If so, exit the precise positioning unit and the adjustment is completed; otherwise, proceed to the next step.

[0116] S109. Determine whether the set opening value of the actuator has changed. If so, set the number of slow rotations to 0; otherwise, increment the number of slow rotations by 1 and proceed to the next step.

[0117] S110. Determine whether the number of slow adjustment operations is greater than or equal to the second set number. If not, return to step S101; if so, end the current adjustment.

[0118] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0119] Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control method for a CDU temperature control actuator, characterized in that: include: Obtain basic data, including current liquid supply temperature, set temperature and current actuator opening value; Determine the actuator set opening value corresponding to the set temperature according to the basic data; Calculate the opening difference between the actuator set opening value and the actuator current opening value; Compare the opening difference with a first threshold and a set accuracy value; wherein the first threshold is greater than the set accuracy value; When the opening difference is greater than a first threshold, a fast adjustment program is entered, wherein the temperature adjustment actuator rotates rapidly at a first rate during at least part of the adjustment time; After each rapid rotation is performed, the opening difference is compared with the first threshold and the set accuracy value; if the opening difference is still greater than the first threshold, the rapid rotation operation is performed again, and the number of rapid rotations is accumulated until the opening difference is less than the first threshold or the number of rapid rotations reaches the first set number, then the rapid adjustment program is exited; According to the current opening value of the actuator after exiting the quick adjustment program, the opening difference is compared with the set accuracy value; When the opening difference is greater than the set accuracy value, a slow adjustment program is entered, wherein the temperature adjustment actuator rotates slowly at a second rate during at least part of the adjustment time, and the second rate is less than the first rate; After each slow rotation, the opening difference is compared with the set accuracy value; if the opening difference is still greater than the set accuracy value, the slow rotation operation is performed again, and the number of slow rotations is accumulated until the opening difference is less than the set accuracy value or the number of slow rotations reaches the second set number, then the slow adjustment program is exited; The first set number of times and the second set number of times are calculated based on the current liquid supply temperature and the set temperature.

2. The control method for a CDU temperature control actuator according to claim 1, characterized in that: The calculation method of the first set number of times includes: in, Indicates the first set number of times; Indicates the proportionality factor of rapid adjustment; Indicates the number of basic rapid adjustments; Indicates the absolute value of the difference between the current liquid supply temperature and the set temperature.

3. The control method for a CDU temperature control actuator according to claim 1, characterized in that: The calculation method of the second set number of times includes: in, Indicates the second set number of times; Indicates the proportional coefficient of slow adjustment; Indicates the number of basic slow adjustments; Indicates the absolute value of the difference between the current liquid supply temperature and the set temperature.

4. The control method for a CDU temperature control actuator according to claim 1, characterized in that: The first rate is the maximum rate set by the fast adjustment program; the second rate is the maximum rate set by the slow adjustment program; The motion trajectory of each action of the temperature regulating actuator in the fast adjustment program and the slow adjustment program includes a uniform acceleration section, a uniform speed section and a uniform deceleration section; Among them, in the fast adjustment program, the uniform speed section is a trajectory section rotating at a first rate; in the slow adjustment program, the uniform speed section is a trajectory section rotating at a second rate.

5. The control method for a CDU temperature control actuator according to claim 4, characterized in that: Also includes: After completing the opening adjustment of the actuator, the set first rate and second rate are corrected according to the deviation between the actuator set opening value and the actuator terminal opening value in the last N times, and the corrected first rate and second rate are used for the next opening adjustment.

6. The control method for a CDU temperature adjustment actuator according to claim 5, characterized in that: The first rate correction method comprises: in, Indicates the correction result of the first rate; Indicates the first rate set this time; represents the self-learning coefficient of the first rate; Indicates the actuator final opening value of the nth adjustment among the most recent N opening adjustments; Indicates the actuator setting opening value set in the nth adjustment among the most recent N opening adjustments; The second rate correction method includes: in, Indicates the correction result of the second rate; Indicates the second rate set this time; Indicates the self-learning coefficient of the second rate.

7. The control method for a CDU temperature control actuator according to claim 1, characterized in that: The standard opening range of the temperature regulating actuator is 0-90°. When the temperature regulating actuator opening is 0°, it corresponds to the fully closed state of the CDU liquid supply valve. When the temperature regulating actuator opening is 90°, it corresponds to the fully open state of the CDU liquid supply valve. At least two limit travel switches are arranged on the temperature regulating actuator, wherein one limit travel switch is arranged at the -2.5° position and the other limit travel switch is arranged at the 92.5° position, so as to expand the actual opening range of the temperature regulating actuator to -2.5-92.5°.

8. The control method for a CDU temperature adjustment actuator according to claim 1, characterized in that: The setting accuracy value ranges from 0.2 to 1°; The first threshold is M times the set accuracy value, and M is not less than 2.

9. The control method for a CDU temperature adjustment actuator according to claim 1, characterized in that: Also includes: The temperature of the motor winding inside the temperature control actuator is obtained. When the temperature of the motor winding exceeds the temperature threshold, the control system stops the motor in an interlocking manner.

10. A control system for a CDU temperature control actuator, characterized in that: The control system uses the control method according to any one of claims 1 to 9 to adjust the opening of the temperature control actuator to control the corresponding rotation of the liquid supply valve, thereby making the liquid supply temperature of the CDU system approach the set temperature; The control system comprises: Data acquisition module, used to collect and process basic data; The precise positioning module is used to calculate the opening difference according to the basic data, compare the opening difference with the first threshold and the set accuracy value respectively, judge whether the opening difference meets the accuracy requirement according to the comparison result, and if the accuracy requirement is not met, select the fast adjustment program or the slow adjustment program according to the degree of deviation to adjust the opening of the actuator; wherein both the fast adjustment program and the slow adjustment program have an upper limit of the number of adjustments, and the upper limit of the number of adjustments is calculated according to the current liquid supply temperature and the set temperature; The self-learning module is used to correct the set first rate and second rate according to the deviation between the actuator set opening value and the actuator terminal opening value in the most recent N times after completing the opening adjustment of the actuator, and use the corrected first rate and second rate for the next opening adjustment.

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