CN115306692A

CN115306692A - Method and control device for temperature alarm of compressor

Info

Publication number: CN115306692A
Application number: CN202210832886.0A
Authority: CN
Inventors: 庞颢; 陈震; 李振强
Original assignee: Shenzhen Threshold Industrial Technology Co ltd
Current assignee: Shenzhen Haige Jingu Industrial Technology Co.,Ltd.
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2022-11-08
Anticipated expiration: 2042-07-14
Also published as: CN115306692B

Abstract

The application provides a method and a control device for compressor temperature alarm. The method is applied to a controller of a compressor control system, and comprises the following operations which are repeatedly executed in a preset scanning period: acquiring and storing a current value of the field temperature of the compressor; calculating the temperature change rate according to the current value of the site temperature, the last value of the site temperature and the preset scanning period; when the temperature change rate is larger than the change rate threshold value, outputting a temperature abnormal signal, and keeping outputting until receiving a reset signal; and sending out a temperature abnormity alarm according to the temperature abnormity signal. The technical scheme of this application is through judging temperature detection value's authenticity according to the rate of change threshold value, and the abnormal temperature signal shielding that detects out is shut down, prevents the mistake and shuts down.

Description

Method and control device for compressor temperature alarm

Technical Field

The application relates to the technical field of industrial control, in particular to a method and a control device for compressor temperature alarm.

Background

The compressor is an important device in devices such as air separation, chemical production and the like. The large compressor set plays a very important role in production, and once a fault occurs, the normal operation of production is seriously influenced. In order to ensure the safe operation, the device is generally protected by detecting parameters such as vibration, temperature and the like.

However, because of the large number of field electrical devices, the production environment is complex, and basically weak electrical signals are involved in automatic detection, electromagnetic interference is very easy to be caused in the signal transmission process, and especially the thermal resistance temperature signals are easy to be interfered. If the temperature measurement signal from the site mixes into the interference signal in the transmission process, the computer detection system is difficult to distinguish, so that the interlocking shutdown can be caused once the temperature signal is detected to suddenly change to a shutdown value.

In addition, the thermal resistance thermometer works in a place with serious vibration for a long time, and is easy to cause disconnection, short circuit or poor contact, thereby causing abnormal sudden change of temperature values. In temperature protection, the jump of the measured value often causes protection malfunction, resulting in shutdown, which causes great loss to production.

In the filtering process of the temperature false signal, the normal temperature change of the thermometer can be generally judged by means of a smoothing filtering algorithm and the like, so that the normal operation of the temperature protection logic of the compressor is ensured, and meanwhile, abnormal temperature interference signals are shielded. However, this approach occupies a lot of computing resources, is inefficient, and may cause false negatives.

The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

The application aims to provide a method and a control device for compressor temperature alarm, which can prevent error interlocking shutdown caused by temperature abnormal signals.

This user characteristic and advantage of the present application will become apparent from the detailed description below or may be learned in part by practice of the present application.

According to an aspect of the present application, there is provided a method for alarming a temperature of a compressor, applied to a controller of a compressor control system, the method including repeatedly performing the following operations at a predetermined scan cycle:

acquiring and storing a current value of the field temperature of the compressor;

calculating the temperature change rate according to the current value of the field temperature, the last value of the field temperature and the preset scanning period;

when the temperature change rate is larger than the change rate threshold value, outputting a temperature abnormal signal, and keeping outputting until receiving a reset signal;

and sending out a temperature abnormity alarm according to the temperature abnormity signal.

According to another aspect of the present application, there is provided a control apparatus including:

a processor;

a memory having a computer program stored thereon;

the aforementioned method is implemented when the computer program is executed by the processor.

According to the exemplary embodiment, by judging the authenticity of the temperature detection value according to the change rate threshold value, the detected abnormal temperature signal is shielded and stopped, and the false interlocking stop caused by the temperature abnormal signal is prevented. According to other embodiments, a cyclic alarm can be performed according to the temperature abnormal signal to remind an operator to process.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 shows a schematic diagram of a control system for an air separation plant.

FIG. 2 illustrates a rate of temperature change when simulating a harsh operating environment, according to an example embodiment.

FIG. 3 shows a flow chart of a method for compressor temperature alerting, according to an example embodiment.

FIG. 4 illustrates a flowchart of a method of periodically alerting when a temperature anomaly signal has not been removed, according to an example embodiment.

FIG. 5 illustrates a block diagram of a system for compressor temperature warning, implemented according to an example embodiment.

Fig. 6 shows a block diagram of a control device according to an example embodiment of the present application.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.

The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.

The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. One skilled in the art will appreciate that the embodiments described herein can be combined with other embodiments.

Fig. 1 shows a schematic diagram of a control system 100 for an air separation plant, which may be based on DCS or PLC.

As shown in FIG. 1, the control system 100 may include an electrical unit 102, a motor 104, a compressor 106, a controller 108, a field shutdown button 110, a solenoid and automatic regulating valve unit 112, a Human Machine Interface (HMI) 114, and the like.

The electrical unit 102 is used to control power supply circuit components of the compressor 106 and the motor 104, and the power supply circuit components may include conventional controls such as a vacuum circuit breaker for controlling a main circuit of the compressor, a device for starting the compressor at a reduced voltage, and a secondary protection circuit, which are not described herein again.

The controller 108 can send out a control command according to the collected information, so that the electric unit 102 controls the compressor 106 to start and stop according to the command sent by the controller 108.

The controller 108 may be a DCS and/or PLC controller for periodically executing system monitoring logic. For example, the controller 108 may monitor status signals of the on-site shutdown button 110, operating status signals of the compressor 106, and related compressor process parameters.

If the controller 108 collects a true signal (true) as the status signal of the field shutdown button 110, a shutdown alarm is output when the field shutdown button is pressed.

If the controller 108 collects that the operating status signal of the compressor 106 is a false signal (false), a compressor operating signal loss alarm is issued.

The controller 108 utilizes compressor protection logic to determine whether a shutdown alarm condition is satisfied based on compressor process parameters. The compressor process parameters may include compressor temperature parameters, such as temperature signals collected by a platinum thermistor thermometer and transmitted to the controller 108. When the compressor temperature exceeds the shutdown threshold, the compressor protection logic outputs a true signal (true), i.e., determines that the temperature shutdown alarm condition is met, the controller 108 outputs a compressor shutdown signal to the electrical unit 102 and issues a compressor interlock shutdown alarm. The compressor protection logic may employ existing or known compressor protection function blocks or methods, which are not described in detail herein.

The controller 108 may record the alarm so that a worker may locate and confirm the source of the fault by analyzing the alarm record.

The human-machine interface 114 can be used for loading and unloading the compressor, and the controller 108 correspondingly processes the signals and outputs the signals to the solenoid valve and automatic control valve unit 112 through the signal output module 1024, so that the automatic control valve performs loading and unloading control on the compressor.

In the temperature signal processing, it is necessary to determine and process a false signal generated by factors such as interference. In general filtering processing, normal temperature change of the thermometer can be judged through modes such as a smoothing filtering algorithm and the like, normal operation of a compressor temperature protection logic is guaranteed, and abnormal temperature interference signals are shielded. However, this approach handles situations that occupy a lot of storage and computing resources, and is inefficient and may not be in real time. Furthermore, this method may also cause false positives and may therefore have serious consequences.

Therefore, the method for judging whether the temperature jump is normal or not according to the temperature change rate threshold value is provided, so that the condition that the normal temperature protection is shielded by mistake due to misjudgment is avoided, and more accidents are avoided.

The technical solution and advantages of the present application will be described in detail with reference to the following examples.

FIG. 2 illustrates a rate of temperature change when simulating a harsh operating environment in accordance with an example embodiment.

According to an exemplary embodiment, a test harsh condition is simulated by moving a platinum thermistor thermometer from a-193 ℃ environment to a 100 ℃ extreme environment. And the compressor can not have such a harsh working condition environment in the actual production. The following description will be made of an exemplary embodiment taking a DCS control system as an example, and it is easily understood that the exemplary embodiment can also be applied to a PLC control system.

Therefore, a platinum thermal resistance thermometer is connected to a thermal resistance measuring module of the DCS control system through a cable, and data obtained through scanning of the DCS controller is stored in a DCS historical database. The actual temperature value is displayed on the DCS screen, and is refreshed once per second, and the trend is recorded in the DCS trend configuration. Firstly, a platinum thermal resistance thermometer is put into liquid nitrogen with the temperature of-193 ℃, and after a DCS picture displays the temperature of-193 ℃, the thermal resistance is quickly put into boiled water with the temperature of 100 ℃. The temperature change was recorded by the DCS controller for a 1 second sweep period. The maximum change rate per second can be known from a temperature rise graph to be not more than 40 ℃/second. Through a plurality of experiments, under possible severe working conditions, the maximum value of the temperature change rate can be determined within the range of 30-40 ℃/second.

Therefore, in the protection logic of the compressor temperature, the threshold value of the positive normal temperature change rate of the platinum thermistor thermometer can be set within the range of 30-40 ℃/second, so that normal temperature change can be prevented from being filtered, and abnormal temperature values can also be filtered.

FIG. 3 shows a flow chart of a method for compressor temperature warning according to an example embodiment.

The method of fig. 3 may be performed by a periodic sweep of the controller of the compressor control system of fig. 1, where the sweep period may be 500 milliseconds or 1 second, or other suitable values as the case may be.

Referring to fig. 3, at S301, a current value of the field temperature of the compressor is acquired and stored.

The controller may periodically execute system monitoring logic. For example, the DCS control system thermal resistance measurement module periodically detects the compressor field temperature signal through a field platinum thermal resistance thermometer.

At S303, a temperature change rate is calculated based on the current value of the field temperature, the last value of the field temperature, and a predetermined scan period.

And dividing the difference between the current value and the last value of the field temperature by the scanning period to obtain the temperature change rate. If the scanning period is 1 second, the difference between the current value and the last value can be directly used as the temperature change rate.

In S305, when the temperature change rate is greater than the change rate threshold, the temperature abnormality signal is output, and the output is maintained until the reset signal is received.

According to some embodiments, as previously described, the threshold rate of change is experimentally pre-derived and may be in the range of 30-40 ℃/sec.

When the temperature change rate calculated according to the collected data is greater than the change rate threshold value, for example, greater than 40 ℃/second, a temperature abnormal signal, for example, a false value signal (false) can be output. In addition, the temperature anomaly signal may remain output until a reset signal is received. According to some embodiments, an operator is required to handle the exception, and the output temperature exception signal is reset after the manual reset signal is generated.

In S307, a temperature abnormality alarm is issued based on the temperature abnormality signal.

According to an example embodiment, if a temperature anomaly signal is obtained, a temperature anomaly alarm is issued, such as sounding and generating a pop-up alarm.

According to some embodiments, when the temperature abnormal signal is not eliminated, periodic alarm can be carried out, so that an operator is periodically reminded to process the abnormal signal, and the system is enabled to eliminate the temperature abnormal signal through a manual reset signal. For example, after the alarm sound is triggered, the operator always alarms without muting the sound for confirmation. Periodic alarms, as used herein, refer to an operator pressing an alarm confirmation (e.g., direct mute) when the alarm sound is no longer audible, but will re-trigger the alarm over a period of time, which the DCS itself does not have.

According to some embodiments, a normal temperature signal is output when the rate of temperature change is less than the rate of change threshold, and a current value of the field temperature may be output for compressor shutdown protection determination based on the normal temperature signal. The compressor shutdown protection judgment module can perform temperature protection shutdown judgment according to the current value of the field temperature so as to determine whether to output a shutdown signal according to the field compressor temperature.

According to some embodiments, when there is a temperature abnormality signal, a set temperature value may be output according to the temperature abnormality signal. The set temperature value may be a preset value that is less than a shutdown temperature threshold, such that the compressor shutdown protection module may perform normal decision logic and not generate a shutdown signal.

Therefore, according to the embodiment, when the logic for shielding the temperature fake signal is designed, the controller can distinguish the correct temperature signal, and the phenomenon that the normal temperature protection is shielded by mistake due to misjudgment is avoided, so that more accidents are caused. The worst simulated change rate of the platinum thermal resistance thermometer in the actual operation environment is used as the change rate threshold, so that interference signals can be reliably eliminated, and the reliability and the safety of the system are improved.

Referring to fig. 4, in S401, an output signal is periodically generated based on a temperature abnormality signal and a feedback signal, and the feedback signal is obtained by performing off-delay operation on the output signal.

For example, the abnormal temperature signal may be used as an input signal at the S terminal of the RS flip-flop, and the output signal at the Q terminal of the RS flip-flop may be subjected to an off-delay operation to be used as an input signal at the R terminal, so that when the abnormal temperature signal continues to exist, a periodic output signal is generated at the Q terminal of the RS flip-flop.

At S403, a timing pulse is generated according to the output signal. According to some embodiments, a timing pulse of a predetermined duration may be generated from the output signal to trigger an alarm. For example, the predetermined time period may be 1 second.

At S405, an alarm is generated based on the timing pulse. According to some embodiments, the alarm may be generated based on a timed pulse, including generating a pop-up alarm and/or an audible alarm via a human machine interface.

The method shown in fig. 4 can be implemented by configuration software in a feedback mode, and is strong in adaptability and easy to use and popularize.

FIG. 5 illustrates a block diagram of a system for compressor temperature warning, implemented according to an example embodiment. The system shown in fig. 5 can be implemented by DCS or PLC configuration software and is triggered and executed by periodic scanning of the controller.

Referring to fig. 5, the periodic scanning characteristic of the DCS controller or the PLC controller may be utilized to collect a temperature signal and detect a step response of the temperature. Variables are established in the DCS/PLC for temperature points needing interlocking protection, the last scanning measured value of each temperature point is assigned to the corresponding variable, and the scanning period can be 1 second, for example.

The current value of the field temperature of the compressor and the last value of the field temperature are input into a subtraction module SUB, and because the scanning period is 1 second, the absolute value of the difference value of the current value of the field temperature and the last value of the field temperature is obtained by an absolute value module ABS, and the temperature change rate can be obtained.

The rate of temperature change is input to the comparison module GE, while the comparison module GE also inputs a predetermined rate of change threshold, such as 40 ℃/sec. The comparison module GE outputs a temperature abnormality signal (true signal true) if the temperature change rate is greater than or equal to 40 ℃/sec, otherwise outputs false.

And the comparison module GE is connected with the S end of the RS trigger RS. Therefore, when the GE outputs true, the S terminal is true, and the Q terminal of the RS flip-flop outputs true.

The RS trigger has the characteristic that the S end triggers once, and as long as the R end RESET signal RESET is not true, the Q end of the RS trigger outputs true. Even if the S end becomes false again, the Q end of the RS trigger still outputs true; when the R terminal of the flip-flop is true (flip-flop reset), the Q terminal becomes false.

When the temperature changes suddenly, the RS trigger outputs true, and then an alarm signal can be output through a man-machine interface, for example, flashing alarm information is displayed on the interface.

According to an example embodiment, the abnormal temperature signal (true value signal true) may be output to the S terminal of the second RS flip-flop RS2, the Q terminal outputs true to the pulse timer TP, and the pulse timer TP may output a pulse of, for example, 1 second to the human-machine interface, so that a small window alarm may be popped up through the human-machine interface to remind an operator of troubleshooting the thermometer.

The output of the Q terminal is also fed back to the R terminal of the second RS trigger RS2 through the OFFDELAY module. The off delay module OFFDELAY may generate a delay of, for example, 180 seconds. The function of the off delay module OFFDELAY is: when the input is changed from false to true, true is immediately output; and when the input is changed from true to false, true is continuously output and the timing is started, and when the time is accumulated to the set time (for example, 180S is set here), false is output.

The second RS flip-flop RS2 outputs true to the off delay module OFFDELAY, and the off delay module OFFDELAY immediately outputs true to the R terminal of the second RS flip-flop RS 2. At this time, the R terminal is true, and although the S terminal is true at this time, the RS flip-flop is an R terminal priority function block, so the second RS flip-flop RS2 is reset, and outputs false to the input terminal of the off delay module OFFDELAY. And the off delay module OFFDELAY starts to time while continuing to output true, and when the time reaches the set time, for example, 180S, the off delay module OFFDELAY outputs false. At this time, the S terminal of the second RS flip-flop RS2 is input by the RS flip-flop of the previous stage. The R end of the upper-stage trigger is connected with a reset button, and the reset button can be reset only by a technician after the technician checks the fault and confirms to press the reset button. As long as the fault is not checked and the button is not pressed, the output end of the RS trigger at the upper stage is always true, and true is still output even after the fault or interference disappears. When the OFFDELAY timing time of the turn-off delay module is up and the false is output, the R end of the second RS trigger RS2 is the false, because the S end is still true, the second RS trigger RS2 outputs true again, the pulse timer TP is triggered again, the pulse timer TP outputs a pulse of 1 second for example to the man-machine interface, and therefore a small window alarm is popped out through the man-machine interface again to remind an operator of troubleshooting the thermometer. And meanwhile, the off delay module OFFDELAY outputs true, and the connected second RS trigger RS2 is reset. And circulating again, and continuously sending out popup alarm at intervals until the thermometer is cleared of faults, pressing a reset button, resetting the RS trigger at the upper stage, and finishing circulating popup alarm.

According to some embodiments, the Q terminal of the RS flip-flop is connected to the first input terminal IN1 of the selection module SEL. The selection module SEL has the role of: when the first input end IN1 is true, the input of the third input end IN3 is selected to be output; when the first input terminal IN1 is false, the input of the second input terminal IN2 is selected to be output.

When the current value of the field temperature is normal, the RS trigger outputs false, the input of the first input end IN1 of the selection module SEL is false, and then the selection module SEL outputs IN2.

According to some embodiments, the temperature value may be displayed on the control interface according to the output of the selection module SEL.

According to some embodiments, an output of the selection module SEL may be connected to one input of the second comparison module GE2, the other input of the second comparison module GE2 inputting the shutdown temperature threshold. When the temperature does not change suddenly (the temperature change rate is smaller than the change rate threshold value) but slowly rises due to equipment reasons, the selection module SEL outputs the current value of the field temperature, and if the temperature is larger than or equal to the set shutdown temperature threshold value, the second comparison module GE2 outputs a true temperature protection signal (true) to the compressor temperature interlocking protection module to stop the compressor. When the temperature sudden change (the temperature change rate is greater than the change rate threshold) exists, the selection module SEL outputs a temperature set value smaller than the shutdown temperature threshold, and the second comparison module GE2 outputs a temperature protection false value signal (false), so that the compressor temperature interlocking protection module does not generate an action of stopping the compressor.

According to an example embodiment, there may be two alarms when the temperature is abruptly changed. Firstly, a temperature abnormity alarm is popped up in a man-machine interface alarm column, and an audio alarm can be accompanied, for example, a flashing character can be displayed on a picture. Meanwhile, a secondary small window can be popped up to alarm and remind an operator. At this time, even if the operator eliminates the alarm sound and turns off the pop-up secondary small window alarm, since this temperature is extremely important, if the actual troubleshooting process is not performed and reset, the small window pops up again after a predetermined time (for example, 180 seconds) to remind the operator of timely processing.

As shown in fig. 6, the control device 30 includes a processor 12 and a memory 14. Control device 30 may also include a bus 22, a network interface 16, and an I/O interface 18. The processor 12, memory 14, network interface 16, and I/O interface 18 may communicate with each other via a bus 22.

Processor 12 may include one or more general-purpose CPUs (Central Processing units), microprocessors, application specific integrated circuits, or the like, for executing associated program instructions.

The memory 14 may include a machine-system-readable medium in the form of volatile memory, such as Random Access Memory (RAM), read Only Memory (ROM), and/or cache memory. Memory 14 is used to store one or more programs containing instructions and data. The processor 12 may read instructions stored in the memory 14 to perform the methods described above according to embodiments of the present application.

The control device 30 may also communicate with one or more networks through the network interface 16. The network interface 16 may be a wired network interface, a wireless network interface, or a virtual network interface.

The control apparatus 30 may also communicate with one or more external devices (e.g., audio input device, audio output device, camera, keyboard, mouse, display, various sensors, etc.) via an input/output (I/O) interface 18.

The bus 22 may include an address bus, a data bus, a control bus, and the like. Bus 22 provides a path for information exchanged between the components.

It should be noted that, in the implementation process, the control device 30 may further include other components necessary for normal operation. In addition, those skilled in the art will appreciate that the above-described apparatus may also include only those components necessary to implement the embodiments of the present description, and not necessarily all of the components shown in the figures.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is only a logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some service interfaces, indirect coupling or communication connection of devices or units, and may be electrical or in other forms.

Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present application may be substantially implemented or a part of or all or part of the technical solution contributing to the prior art may be embodied in the form of a software product stored in a memory, and including several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present application.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

The embodiments of the present application have been described and illustrated in detail above. It should be clearly understood that this application describes how to make and use particular examples, but the application is not limited to any details of these examples. Rather, these principles can be applied to many other embodiments based on the teachings of the present disclosure.

Those skilled in the art will readily appreciate from the description of exemplary embodiments that technical solutions according to embodiments of the present application may have at least one or more of the following advantages.

According to the exemplary embodiment, the detected abnormal temperature signal is shielded and stopped by judging the authenticity of the temperature detection value according to the change rate threshold value, so that the error stop is prevented.

According to some embodiments, a cyclic alarm can be performed according to the temperature anomaly signal to remind an operator to process.

According to some embodiments, the worst temperature change rate simulated in the actual operation environment is adopted as the change rate threshold value, so that the interference signal can be reliably eliminated, and the reliability and the safety of the system are improved.

According to some embodiments, while the logic for shielding the temperature glitch is designed, the controller can distinguish the correct temperature signal, so that the phenomenon that the normal temperature protection is mistakenly shielded due to misjudgment to cause more accidents is prevented.

The foregoing may be better understood in light of the following clauses:

1. a method for compressor temperature warning for use in a controller of a compressor control system, the method comprising repeatedly performing the following operations at a predetermined scan cycle:

2. The method of clause 1, wherein the predetermined scan period is 1 second or 500 milliseconds.

3. The method of clause 1, wherein the threshold rate of change is in the range of 30-40 ℃/sec.

4. The method of clause 1, wherein the threshold rate of change is obtained experimentally in advance.

5. The method of clause 1, further comprising:

when the temperature change rate is smaller than a change rate threshold value, outputting a normal temperature signal;

and outputting the current value of the field temperature according to the temperature normal signal so as to be used for judging the shutdown protection of the compressor.

6. The method of clause 1, wherein the reset signal comprises a manual reset signal.

7. The method as set forth in clause 1, further comprising: and periodically alarming when the temperature abnormal signal is not eliminated.

8. The method of clause 7, wherein periodically alerting when the temperature anomaly signal is not removed comprises:

periodically generating an output signal based on the temperature abnormal signal and a feedback signal, wherein the feedback signal is obtained by performing turn-off delay operation on the output signal;

generating a timing pulse according to the output signal;

and generating an alarm according to the timing pulse.

9. The method of clause 8, wherein generating an alarm based on the timing pulse comprises:

and generating a pop-up window alarm and/or an audible alarm through a man-machine interface.

10. The method of clause 1, further comprising: and outputting a set temperature value according to the temperature abnormal signal, wherein the set temperature value is a preset value smaller than a shutdown temperature threshold value.

11. The method of clause 10, wherein the set temperature value is in the range of 20-35 ℃.

12. A control device, comprising:

a processor;

a memory having a computer program stored thereon;

the method of any of clauses 1-11 is implemented when the computer program is executed by the processor.

Exemplary embodiments of the present application are specifically illustrated and described above. It is to be understood that the application is not limited to the details of construction, arrangement, or method of implementation described herein; on the contrary, the application is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A method for compressor temperature warning, applied to a controller of a compressor control system, comprising repeatedly performing, at a predetermined scanning period:

2. The method of claim 1, wherein the predetermined scan period is 1 second or 500 milliseconds.

3. The method of claim 1, wherein the threshold rate of change is in the range of 30-40 ℃/sec.

4. The method of claim 1, wherein the threshold rate of change is experimentally derived in advance.

5. The method of claim 1, further comprising:

when the temperature change rate is smaller than a change rate threshold value, outputting a temperature normal signal;

and outputting the current value of the field temperature according to the temperature normal signal so as to carry out shutdown protection judgment on the compressor.

6. The method of claim 1, wherein the reset signal comprises a manual reset signal.

7. The method as recited in claim 1, further comprising: and carrying out periodic alarm when the temperature abnormal signal is not eliminated.

8. The method of claim 7, wherein periodically alerting when the temperature anomaly signal is not removed comprises:

generating a timing pulse according to the output signal;

and generating an alarm according to the timing pulse.

9. The method of claim 8, wherein generating an alarm based on the timing pulse comprises:

10. The method of claim 1, further comprising: and outputting a set temperature value according to the temperature abnormal signal, wherein the set temperature value is a preset value smaller than a shutdown temperature threshold value.

11. The method of claim 10, wherein the set temperature value is in the range of 20-35 ℃.

12. A control device, characterized by comprising:

a processor;

a memory having a computer program stored thereon;

the method according to any of claims 1-11, when executed by the processor.