CN113969889A - Preheating control method and system for variable frequency compressor - Google Patents
Preheating control method and system for variable frequency compressor Download PDFInfo
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- CN113969889A CN113969889A CN202111367344.2A CN202111367344A CN113969889A CN 113969889 A CN113969889 A CN 113969889A CN 202111367344 A CN202111367344 A CN 202111367344A CN 113969889 A CN113969889 A CN 113969889A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004891 communication Methods 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the field of preheating of variable frequency compressors, in particular to a method and a system for controlling the preheating of the variable frequency compressors, which improve the starting efficiency and the safety of the variable frequency compressors and adopts the following technical scheme: under the condition that the inverter compressor does not operate the preheating function, when the current exhaust temperature is less than the preheating starting threshold value, the shutdown time is more than a first specific time, and the first duration time after the last preheating is more than a second specific time, the preheating function of the inverter compressor is started; and under the condition that the variable frequency compressor is running for the preheating function, the second duration time that the exhaust temperature of the variable frequency compressor continuously exceeds the temperature of the exit preheating threshold value is longer than the third specific time, or the variable frequency compressor has a starting signal and the current preheating duration time is longer than the fourth specific time, or the main control board and the driving board of the variable frequency compressor have communication faults, and then the preheating function of the running variable frequency compressor is exited. The invention is suitable for preheating the compressor in cold environment.
Description
Technical Field
The invention relates to the field of preheating of variable frequency compressors, in particular to a preheating control method and system for a variable frequency compressor.
Background
The living standard of residents in the modern society is continuously improved, air conditioners are used in most families in China along with the continuous promotion of coal-to-electricity engineering in northern areas of China, and in order to save energy, improve efficiency and protect environment, air conditioner products purchased by residents are basically of a frequency converter type. However, due to differences in environmental factors such as climate between regions, the control of the inverter type needs to be adapted to the local conditions. Particularly, in northern areas, factors such as cold climate need to be considered, comfort and energy conservation are ensured, and meanwhile, the safety, reliability and stability of the system are ensured.
The existing inverter air conditioner cannot run or has low running efficiency generally because the compressor cannot be started or the starting time is too long in a cold environment, so that the use requirements of customers in the regions cannot be met, and the risk in the aspect of safety and reliability is more likely to exist.
Disclosure of Invention
The invention aims to provide a preheating control method and a preheating control system for an inverter compressor, which solve the problems that the inverter compressor cannot be started in a cold environment or the starting time is too long, so that the compressor cannot run or the running efficiency is low, and the safety and reliability are risked, meet the use requirements of users, enhance the running efficiency, and improve the safety and reliability.
The invention adopts the following technical scheme to realize the aim, and the preheating control method of the variable frequency compressor comprises the following steps:
step 1, judging whether the inverter compressor is running a preheating function, and if not, entering step 2; if yes, entering step 6;
step 2, acquiring the current exhaust temperature of the variable frequency compressor, judging whether the current exhaust temperature is less than a preheating starting threshold temperature, and if so, entering step 3; if not, exiting the preheating starting judgment program;
step 3, obtaining the shutdown time of the variable frequency compressor, judging whether the shutdown time is greater than a first specific time, and if so, entering step 4; if not, exiting the preheating starting judgment program;
step 4, obtaining a first duration after the last preheating, and judging whether the first duration is greater than a second specific time, if so, entering step 5; if not, exiting the preheating starting judgment program;
step 5, starting the preheating function of the variable frequency compressor, and exiting the preheating starting judgment program;
step 6, obtaining a second duration time that the exhaust temperature of the variable frequency compressor continuously exceeds the temperature of the exit preheating threshold value, and judging whether the second duration time is longer than a third specific time, if so, entering a step 7;
or judging whether the variable frequency compressor has a starting signal, if so, calculating the current preheating duration time, judging whether the current preheating duration time is more than a fourth specific time, and if so, entering a step 7;
or judging whether the main control board and the driving board of the variable frequency compressor have communication faults or not, if so, entering the step 7;
and 7, exiting the preheating function of the running compressor, and exiting the preheating exit judgment program.
Further, in step 5, after the preheating function of the inverter compressor is started, the method further comprises: clearing the relevant variable and the flag.
Further, in step 7, after exiting the preheating function in which the compressor is operating, the method further includes: clearing the relevant variable and the flag.
Further, in step 6, the communication failure includes that the master control board does not receive the data of the drive board or receives the wrong data within the set continuous time.
The inverter compressor preheating control system is used for executing the inverter compressor preheating control method and comprises the following steps:
the variable frequency compressor main control board is used for judging whether the variable frequency compressor operates a preheating function, acquiring the current exhaust temperature of the variable frequency compressor and judging whether the current exhaust temperature is smaller than a preheating starting threshold value or not if the variable frequency compressor does not operate the preheating function, acquiring the shutdown time of the variable frequency compressor and judging whether the shutdown time is larger than a first specific time or not if the current exhaust temperature is smaller than the preheating starting threshold value, acquiring the first duration after the last preheating is finished if the shutdown time is larger than a second specific time, and starting the preheating function of the variable frequency compressor and quitting the preheating starting judgment program if the first preheating duration is larger than the second specific time;
if the inverter compressor is running the preheating function, acquiring a second duration time that the exhaust temperature of the inverter compressor continuously exceeds the temperature of the exiting preheating threshold value, and judging whether the second duration time is longer than a third specific time, if so, exiting the preheating function running the compressor, and exiting the preheating exiting judging program;
or judging whether the variable frequency compressor has a starting signal, if so, calculating the current prediction duration, judging whether the current prediction duration is greater than a fourth specific time, if so, exiting the preheating function of the running compressor, and exiting the preheating exit judgment program;
or judging whether the main control board and the driving board of the variable frequency compressor have communication faults or not, if so, exiting the preheating function of the running compressor, and exiting the preheating exit judgment program.
The invention uses the easily obtained exhaust temperature and the relevant time parameter of the variable frequency compressor as the judgment condition for starting preheating, and ensures that the variable frequency compressor can be preheated timely and fully before the user starts the machine; the exhaust temperature, the starting signal and the relevant time parameter of the frequency conversion compressor which are easy to obtain are used as judgment conditions for quitting preheating, so that the compressor can not be in a preheating state for a long time, the power consumption is reduced, and the safety and the reliability are improved.
Drawings
FIG. 1 is a flow chart of the preheating control of the inverter compressor according to the present invention.
Detailed Description
The preheating control method of the inverter compressor, as shown in fig. 1, comprises the following steps:
step 1, judging whether the inverter compressor is running a preheating function, and if not, entering step 2; if yes, entering step 6;
step 2, acquiring the current exhaust temperature of the variable frequency compressor, judging whether the current exhaust temperature is less than a preheating starting threshold temperature, and if so, entering step 3; if not, exiting the preheating starting judgment program;
step 3, obtaining the shutdown time of the variable frequency compressor, judging whether the shutdown time is greater than a first specific time, and if so, entering step 4; if not, exiting the preheating starting judgment program;
step 4, obtaining a first duration after the last preheating, and judging whether the first duration is greater than a second specific time, if so, entering step 5; if not, exiting the preheating starting judgment program;
step 5, starting the preheating function of the variable frequency compressor, and exiting the preheating starting judgment program;
step 6, obtaining a second duration time that the exhaust temperature of the variable frequency compressor continuously exceeds the temperature of the exit preheating threshold value, and judging whether the second duration time is longer than a third specific time, if so, entering a step 7;
or judging whether the variable frequency compressor has a starting signal, if so, calculating the current preheating duration time, judging whether the current preheating duration time is more than a fourth specific time, and if so, entering a step 7;
or judging whether the main control board and the driving board of the variable frequency compressor have communication faults or not, if so, entering the step 7;
and 7, exiting the preheating function of the running compressor, and exiting the preheating exit judgment program.
In step 5, after the preheating function of the inverter compressor is started, the method further comprises the following steps: clearing the relevant variable and the flag.
In step 7, the method further comprises the following steps after the preheating function of the running compressor is quitted: clearing the relevant variable and the flag.
In step 6, the communication failure includes that the main control board cannot receive the data of the drive board or receives the wrong data in the set continuous time.
The inverter compressor preheating control system is used for executing the inverter compressor preheating control method and comprises the following steps:
the variable frequency compressor main control board is used for judging whether the variable frequency compressor operates a preheating function, acquiring the current exhaust temperature of the variable frequency compressor and judging whether the current exhaust temperature is smaller than a preheating starting threshold value or not if the variable frequency compressor does not operate the preheating function, acquiring the shutdown time of the variable frequency compressor and judging whether the shutdown time is larger than a first specific time or not if the current exhaust temperature is smaller than the preheating starting threshold value, acquiring the first duration after the last preheating is finished if the shutdown time is larger than a second specific time, and starting the preheating function of the variable frequency compressor and quitting the preheating starting judgment program if the first preheating duration is larger than the second specific time;
if the inverter compressor is running the preheating function, acquiring a second duration time that the exhaust temperature of the inverter compressor continuously exceeds the temperature of the exiting preheating threshold value, and judging whether the second duration time is longer than a third specific time, if so, exiting the preheating function running the compressor, and exiting the preheating exiting judging program;
or judging whether the variable frequency compressor has a starting signal, if so, calculating the current prediction duration, judging whether the current prediction duration is greater than a fourth specific time, if so, exiting the preheating function of the running compressor, and exiting the preheating exit judgment program;
or judging whether the main control board and the driving board of the variable frequency compressor have communication faults or not, if so, exiting the preheating function of the running compressor, and exiting the preheating exit judgment program.
Examples
The inverter air conditioning system of the embodiment of the invention comprises: an outdoor unit, a drive plate, and 1 or more indoor units. The outdoor unit communicates with the drive board and all the indoor units respectively, and the indoor units do not communicate with the drive board. The outdoor unit is used as a main controller to actively send data to the drive board and the indoor unit through different communication ports for communication. This embodiment relates only to the communication between the outdoor unit and the driving board.
The outdoor unit main control board software obtains the following parameters through sampling or calculation:
1. sampling to obtain the real-time exhaust temperature Td of the variable frequency compressor;
2. calculating the present continuous shutdown Time of the compressor 1;
3. calculating the Time Td continues to exceed the Time Time2 for exiting the preheat threshold temperature;
4. calculating the Time Time3 of the current preheat duration;
5. calculating a duration Time4 after the end of the last preheating;
the preheating control procedure a is as follows:
101. judging whether the system is running the preheating function of the compressor, if not, executing 102; if the compressor preheating function is running, executing 105;
102. judging whether Td is less than-4 ℃, if yes, executing 103; otherwise, 110 is executed;
103. judging whether the Time1 is greater than 20 minutes, if so, executing 104; otherwise, 110 is executed;
104. judging whether the Time4 is greater than 30 minutes, if so, starting a preheating function of the compressor, clearing related variables and marks, and executing 110;
105. judging whether the Time2 is greater than 3 minutes, if so, executing step 109; otherwise, 106 is executed;
106. judging whether the variable frequency compressor has a starting signal, if so, executing 107; otherwise, 108 is executed;
107. judging whether the Time3 is greater than 5 minutes, if so, executing step 109; otherwise, 108 is executed;
108. if the communication fault between the outdoor unit main control board and the drive board is judged (the outdoor unit main control board cannot receive the data of the drive board or receives wrong data for 2 minutes continuously), executing 109;
109. exiting the preheating function of the compressor and clearing related variables and marks;
110. and exiting the preheating judgment program.
The preheating control flow B is as follows:
101. judging whether the system is running the preheating function of the compressor, if not, executing 102; if the compressor preheating function is running, executing 105;
102. judging whether Td is less than-4 ℃, if yes, executing 103; otherwise, 107 is executed;
103. judging whether the Time1 is greater than 20 minutes, if so, executing 104; otherwise, 107 is executed;
104. judging whether the Time4 is greater than 30 minutes, if so, starting a preheating function of the compressor, clearing related variables and marks, and executing 107;
105. judging whether the Time2 is greater than 3 minutes, if so, executing 106;
or judging whether the variable frequency compressor has a starting signal, if so, judging whether the Time3 is more than 5 minutes, and if so, executing 106;
or judging whether the main control board and the driving board of the variable frequency compressor have communication faults, if so, executing 106;
106. exiting the preheating function of the compressor and clearing related variables and marks;
107. and exiting the preheating judgment program.
The method controls the starting or quitting of the preheating function of the variable frequency compressor, can meet the requirement that the variable frequency compressor can be stably started in real time in a cold environment, enhances the operating efficiency of a system, improves the safety and reliability, and improves the compatibility and the universality of driving software.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
The invention has the beneficial effects that:
1. the preheating entering and exiting judging logic of the variable frequency compressor is executed in the main control software, and the instruction is sent to the driving board software through the communication of the main control board software to control the variable frequency compressor to preheat or exit, so that the compatibility and reliability of the driving board software are ensured;
2. the exhaust temperature and the related time parameter of the inverter compressor are used as the judgment condition for starting preheating, so that the method can be used for the model without an environment temperature sensor, and the exhaust temperature sensor is basically possessed by each inverter type air conditioner, thereby ensuring the universality of the method;
3. the exhaust temperature and the related time parameter of the frequency conversion compressor which are easy to obtain are used as the judgment condition for starting preheating, so that the frequency conversion compressor can be timely and fully preheated before a user starts up the frequency conversion compressor; the exhaust temperature, the starting signal and the relevant time parameter of the frequency conversion compressor which are easy to obtain are used as judgment conditions for quitting preheating, so that the compressor can be ensured not to be in a preheating state for a long time, and the over-high energy consumption and the reduction of the safety and reliability are avoided.
The parameters used by the control method can be obtained in variable frequency air conditioners of various types, and the control method has strong universality. The method controls the starting or quitting of the preheating function of the variable frequency compressor, can meet the requirement that the variable frequency compressor can be stably started in real time in a cold environment, enhances the running efficiency of a system, improves the safety and reliability, and improves the compatibility and the universality of driving software.
Claims (5)
1. The preheating control method of the inverter compressor is characterized by comprising the following steps:
step 1, judging whether the inverter compressor is running a preheating function, and if not, entering step 2; if yes, entering step 6;
step 2, acquiring the current exhaust temperature of the variable frequency compressor, judging whether the current exhaust temperature is less than a preheating starting threshold temperature, and if so, entering step 3; if not, exiting the preheating starting judgment program;
step 3, obtaining the shutdown time of the variable frequency compressor, judging whether the shutdown time is greater than a first specific time, and if so, entering step 4; if not, exiting the preheating starting judgment program;
step 4, obtaining a first duration after the last preheating, and judging whether the first duration is greater than a second specific time, if so, entering step 5; if not, exiting the preheating starting judgment program;
step 5, starting the preheating function of the variable frequency compressor, and exiting the preheating starting judgment program;
step 6, obtaining a second duration time that the exhaust temperature of the variable frequency compressor continuously exceeds the temperature of the exit preheating threshold value, and judging whether the second duration time is longer than a third specific time, if so, entering a step 7;
or judging whether the variable frequency compressor has a starting signal, if so, calculating the current preheating duration time, judging whether the current preheating duration time is more than a fourth specific time, and if so, entering a step 7;
or judging whether the main control board and the driving board of the variable frequency compressor have communication faults or not, if so, entering the step 7;
and 7, exiting the preheating function of the running compressor, and exiting the preheating exit judgment program.
2. The inverter compressor preheating control method according to claim 1, wherein in step 5, after starting the preheating function of the inverter compressor, the method further comprises: clearing the relevant variable and the flag.
3. The preheating control method for the inverter compressor according to claim 1, wherein the step 7, after exiting the preheating function of the compressor in operation, further comprises: clearing the relevant variable and the flag.
4. The preheating control method for the inverter compressor according to claim 1, wherein in the step 6, the communication failure comprises that the main control board does not receive the data of the driving board or receives the wrong data within the set continuous time.
5. Inverter compressor preheating control system for carrying out the inverter compressor preheating control method according to any one of claims 1 to 4, characterized by comprising:
the variable frequency compressor main control board is used for judging whether the variable frequency compressor operates a preheating function, acquiring the current exhaust temperature of the variable frequency compressor and judging whether the current exhaust temperature is smaller than a preheating starting threshold value or not if the variable frequency compressor does not operate the preheating function, acquiring the shutdown time of the variable frequency compressor and judging whether the shutdown time is larger than a first specific time or not if the current exhaust temperature is smaller than the preheating starting threshold value, acquiring the first duration after the last preheating is finished if the shutdown time is larger than a second specific time, and starting the preheating function of the variable frequency compressor and quitting the preheating starting judgment program if the first preheating duration is larger than the second specific time;
if the inverter compressor is running the preheating function, acquiring a second duration time that the exhaust temperature of the inverter compressor continuously exceeds the temperature of the exiting preheating threshold value, and judging whether the second duration time is longer than a third specific time, if so, exiting the preheating function running the compressor, and exiting the preheating exiting judging program;
or judging whether the variable frequency compressor has a starting signal, if so, calculating the current prediction duration, judging whether the current prediction duration is greater than a fourth specific time, if so, exiting the preheating function of the running compressor, and exiting the preheating exit judgment program;
or judging whether the main control board and the driving board of the variable frequency compressor have communication faults or not, if so, exiting the preheating function of the running compressor, and exiting the preheating exit judgment program.
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