CN111120290A - Overload protection method and overload protection device for compressor - Google Patents
Overload protection method and overload protection device for compressor Download PDFInfo
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- CN111120290A CN111120290A CN201911317787.3A CN201911317787A CN111120290A CN 111120290 A CN111120290 A CN 111120290A CN 201911317787 A CN201911317787 A CN 201911317787A CN 111120290 A CN111120290 A CN 111120290A
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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
- F04B51/00—Testing machines, pumps, or pumping installations
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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
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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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
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
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- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses an overload protection method and an overload protection device of a compressor, wherein the method comprises the following steps: controlling and detecting the suction pressure and the exhaust pressure of the compressor during working, calculating the pressure absolute difference value of the suction pressure and the exhaust pressure, and simultaneously controlling and detecting the working current of the compressor; obtaining a rated current corresponding to the normal operation of the compressor according to the pressure absolute difference value, and calculating a current ratio of the working current to the rated current; and comparing the current ratio with a preset comparison threshold interval, and controlling to stop the compressor when the current ratio is continuously in the comparison threshold interval and the duration is greater than or equal to the corresponding preset duration. The overload protection device is combined with the load characteristic of the compressor, and accurate judgment is realized when the compressor is overloaded, so that the compressor is protected quickly and accurately with high reliability.
Description
Technical Field
The invention discloses an overload protection method and an overload protection device of a compressor, and belongs to the technical field of compressor control.
Background
In the existing refrigerating unit, a compressor is a circuit component belonging to the core, and the characteristics of high cost and easy damage are always important concerns in protection design. In the running process of the compressor, the conditions of liquid impact, oil shortage running, impurity in a circuit, evacuation, unopened exhaust valve, phase shortage, overload and the like can be met, under the conditions, the compressor can show the rise of current in different degrees to form the overload phenomenon of the motor, and the compressor and the motor can be damaged irreversibly after long-time running.
How to protect in time when the compressor is in overload operation, a thermal relay is generally used as a protection scheme for motor overload in the general industry, when the motor is in overcurrent, temperature rise is generated by a temperature-sensitive bimetallic strip in the thermal relay, and when the temperature rise exceeds an action threshold value, a mechanical tripping structure is triggered to disconnect a protection contact; the thermal relay of the scheme has low protection precision, is greatly influenced by the ambient temperature, has higher cost, and can generate false alarm or no alarm at irregular time.
In addition, due to the relatively special load characteristics of the compressor, the operating current of the compressor has a large difference under different suction pressures and exhaust pressures, and in a protection scheme using the thermal relay, a setting current threshold value for protection is often required to be set to a large value, so that the hysteresis of judging the overload current when the motor is abnormal is influenced, the protection mechanism of the thermal relay is delayed to trigger, and the frequent damage of the compressor is caused. This is a significant disadvantage of current protection schemes.
Disclosure of Invention
The invention provides an overload protection method and an overload protection device of a compressor, which are used for realizing accurate judgment of the compressor during overload by combining the load characteristic of the compressor, thereby realizing high reliability, rapidness and accurate protection of the compressor.
An aspect of the present invention relates to an overload protection method of a compressor, the method including:
controlling and detecting the suction pressure and the exhaust pressure of the compressor during working, calculating the pressure absolute difference value of the suction pressure and the exhaust pressure, and simultaneously controlling and detecting the working current of the compressor;
obtaining a rated current corresponding to the normal operation of the compressor according to the pressure absolute difference value, and calculating a current ratio of the working current to the rated current;
and comparing the current ratio with a preset comparison threshold interval, and controlling to stop the compressor when the current ratio is continuously in the comparison threshold interval and the duration is greater than or equal to the corresponding preset duration.
Further, the rated current is calculated by adopting a preset calculation formula, or the rated current is correspondingly selected from a preset mapping relation table.
Further, the calculation formula is a linear function obtained by linear fitting of a plurality of groups of one-to-one corresponding pressure absolute difference values and rated currents.
Furthermore, the comparison threshold intervals comprise a plurality of comparison threshold intervals, and the comparison threshold intervals are all provided with corresponding preset durations.
Further, when the current ratio rises from the lower comparison threshold interval to the higher comparison threshold interval, recording the duration of the current ratio in the lower comparison threshold interval and the duration of the higher comparison threshold interval at the same time; and when the current ratio value is reduced from a higher comparison threshold interval to a lower comparison threshold interval, clearing the duration of the current ratio value in the higher comparison threshold interval.
Another aspect of the present invention relates to an overload protection apparatus applied to the overload protection method as described above, the apparatus including a compressor, a power supply circuit, a controller, a first pressure detector, a second pressure detector, a current detector, and an on-off,
the power supply circuit is connected with the compressor, the on-off device is arranged on the power supply circuit, and the on-off device is electrically connected with the controller;
the current detector is used for detecting the working current on the power supply circuit, and the current detector is electrically connected with the controller;
the first pressure detector is used for detecting the suction pressure at an air inlet when the compressor works, the second pressure detector is used for detecting the exhaust pressure at an exhaust outlet when the compressor works, and the first pressure detector and the second pressure detector are both electrically connected with the controller;
the controller is used for controlling the first pressure detector and the second pressure detector to respectively detect the suction pressure and the discharge pressure, calculating the pressure absolute difference value of the suction pressure and the discharge pressure, controlling and detecting the working current of the compressor at the same time, obtaining the corresponding rated current of the compressor in normal working according to the pressure absolute difference value, and calculating the current ratio of the working current to the rated current; and comparing the current ratio with a preset comparison threshold interval, and when the current ratio is continuously in the comparison threshold interval and the duration is longer than or equal to the corresponding preset duration, controlling the on-off device to stop the compressor.
Further, the current detector is set as a current transformer.
Further, the controller is a single board controller.
Further, the power supply circuit is a three-phase power supply circuit, and the current transformer is configured to detect a working current of the three-phase power supply circuit, where the working current is a three-phase current or a single-phase current of the three-phase power supply circuit.
Further, the on-off device is provided as a mechanical switch or a solid-state relay.
The invention brings the following beneficial effects:
after the compressor runs stably, the pressure difference value is obtained by detecting the suction pressure, the exhaust pressure and the working current when the compressor works, the overload condition of the compressor is accurately and reliably judged through the preset data and the judgment algorithm which are arranged in the controller, and if the overload multiple of the compressor current is judged to fall into the judgment threshold value, the controller disconnects the breaker after proper time delay, and cuts off the power supply circuit of the compressor, thereby playing the role of overload protection. The method combines the load characteristic of the compressor to realize accurate judgment when the compressor is overloaded, thereby realizing high reliability, high speed and accurate protection of the compressor.
Drawings
Fig. 1 is a flow chart illustrating an overload protection method for a compressor according to the present invention;
fig. 2 is a schematic diagram of a fitting curve of absolute difference values of working current and pressure in an application scenario in the overload protection method for a compressor according to the present invention;
fig. 3 is a block diagram of an overload protection circuit of a compressor according to the present invention.
Detailed description of the preferred embodiments
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Examples
Referring to fig. 1, an embodiment of the present invention discloses an overload protection method for a compressor, which includes:
controlling and detecting the suction pressure and the exhaust pressure of the compressor during working, calculating the pressure absolute difference value of the suction pressure and the exhaust pressure, and simultaneously controlling and detecting the working current of the compressor during working;
obtaining a rated current corresponding to the normal operation of the compressor according to the pressure difference value, and calculating a current ratio of the working current to the rated current;
and comparing the current ratio with a preset comparison threshold interval, and controlling to stop the compressor when the current ratio is continuously in the comparison threshold interval and the duration is greater than or equal to the corresponding preset duration.
It should be noted that, the detection of the above parameter values of the compressor should be performed after the compressor operates stably, and the real-time detection, the real-time calculation, the real-time comparison, and the real-time judgment are performed to perform the real-time control. Specifically, the suction pressure refers to air pressure at a suction port when the compressor operates, the discharge pressure refers to air pressure at a discharge port when the compressor operates, and the suction pressure, the discharge pressure and the operating current are corresponding values at the same time node.
In general, if the suction pressure is greater than the discharge pressure, the difference between the suction pressure and the discharge reduction pressure is a positive value; under special conditions, if the suction pressure is less than the exhaust pressure, the difference value of the suction pressure and the exhaust emission pressure is a negative value; in the method, the pressure absolute difference is an absolute difference between the suction pressure and the discharge pressure, that is, the pressure absolute difference is a positive value regardless of whether the suction pressure is greater than the discharge pressure or the suction pressure is less than the discharge pressure.
After the pressure absolute difference is obtained through calculation, the method needs to further obtain the rated current of the compressor at the time node during normal operation, wherein the rated current is obtained through calculation by adopting a preset calculation formula, or the rated current is obtained through corresponding selection from a preset mapping relation table. The calculation formula of the rated current is a preset formula, and the rated current of the compressor working at the current time node can be calculated by substituting the corresponding pressure absolute difference value; or, a mapping relation table of one-to-one correspondence of the pressure absolute difference value and the rated current is preset in the controller, and when the real-time rated current is obtained, the rated current of the controller can be obtained by correspondingly extracting according to the mapping relation table. The current ratio is then obtained by dividing the operating current by the rated current.
The comparison threshold interval is an interval value, the current ratio value is compared with the comparison threshold interval to judge whether the current ratio value falls into the interval value, the current ratio value obtained through real-time detection calculation is compared with the comparison threshold interval, when the current ratio value continuously falls into the interval value, the duration time of the current ratio value is counted and calculated, and if the duration time reaches the set duration time, the power supply of the compressor is cut off, so that the compressor stops working, and the compressor is prevented from being damaged due to continuous overload work.
Specifically, the mapping relation table of the one-to-one correspondence between the absolute pressure difference and the rated current is generally given by a compressor manufacturer, and can also be obtained by measuring the compressor in a normal working state by a user.
The above-mentioned calculation formula for calculating the rated current is: and keeping the compressor in a normal working state, and acquiring a plurality of groups of linear functions obtained by linear fitting of the one-to-one corresponding pressure absolute difference values and rated current. It will be appreciated that the more arrays that are collected, the more the fitted linear function tends to the actual value.
The method is further explained by combining a valley wheel ZP61KUE-TFM turbocompressor of a machine room air conditioner, and it is to be noted that rated current calculation formulas of compressors of different models are different, the method discloses a measuring and calculating method of the rated current calculation formula by taking the ZP61KUE-TFM turbocompressor as an example, and the method adopts a linear fitting method.
Specifically, in the normal working state of the ZP61KUE-TFM turbocompressor, the suction pressure P1 and the exhaust pressure P2 are detected, and the working current a is detected, and the absolute pressure difference is set as P, so that the following can be obtained:
P＝∣P1－P2∣；
several sets of the above data were examined, resulting in the following table:
fitting in an xy coordinate system by taking the current A as an x coordinate and the absolute pressure difference p as a y coordinate to obtain a fitting curve shown in the figure 2:
therefore, a linear function formula between the current a and the absolute pressure difference P of the compressor is obtained from the fitting curve shown In fig. 2, where the current a is the rated current of the compressor In the normal operating state, and the rated current is set to be In, and the calculation formula of the rated current is:
In＝0.1752×P3－0.985×P2+3.1634×P+4.7211；
in order to improve the control reliability of the method, different control modes are adopted under different overload degrees, namely the comparison threshold value intervals comprise a plurality of comparison threshold value intervals, and the comparison threshold value intervals are provided with corresponding preset durations. When the compressor runs in a lower overload state, the working current I of the compressor falls into a lower comparison threshold interval, and the longer running time of the compressor in the load state can be prolonged by presetting the preset time corresponding to the lower comparison threshold interval as a longer time; when the compressor runs in a higher overload state, the working current I of the compressor falls into a higher comparison threshold interval, and the preset time corresponding to the higher comparison threshold interval is preset to be shorter time, so that the compressor is only allowed to run for shorter time in the load state. Because the damage of the slight overload to the compressor is smaller and the occurrence frequency of the slight overload is higher, a longer delay control time is set to ensure the reliability of the operation of the compressor and avoid the frequent stop of the compressor; and the damage to the compressor caused by the ultrahigh overload is large, so that a short delay control time is set to stop the compressor as soon as possible, and the damage to the compressor is avoided.
Specifically, as one embodiment, the multiple sets of comparison threshold intervals and the corresponding preset durations may be set and applied in the following manner:
the first set of comparison threshold intervals is [1.05, 1.1], and its corresponding first set of preset durations: 30 hours;
the second set of comparison threshold intervals is [1.1, 1.2], and its corresponding second set of preset durations: 3 minutes;
the third group of comparison threshold intervals is [1.2, 1.3], and the corresponding third group of preset durations is: 3 seconds;
the fourth comparison threshold interval is [1.3, + ∞ ], and its corresponding fourth preset duration: for 0.3 seconds.
And the current ratio is set as L, and when the compressor works, if the L continuously falls into a comparison threshold interval of which the L is more than or equal to 1.05 and less than 1.1 and the duration time reaches 30 hours, the compressor stops working.
Similarly, if L continuously falls into a comparison threshold interval of which L is more than or equal to 1.1 and less than 1.2 and the duration time reaches 3 minutes, the compressor stops working.
And if L continuously falls into a comparison threshold interval of which L is more than or equal to 1.2 and less than 1.3 and the duration time reaches 3 seconds, stopping the compressor from working.
And if L continuously falls into the comparison threshold interval of more than or equal to 1.3 and less than + ∞andthe duration reaches 0.3 second, stopping the operation of the compressor.
In addition, when the current ratio rises from a lower comparison threshold interval to a higher comparison threshold interval, the duration of the current ratio in the lower comparison threshold interval and the duration of the higher comparison threshold interval are recorded simultaneously; and when the current ratio value is reduced from a higher comparison threshold interval to a lower comparison threshold interval, clearing the duration of the current ratio value in the higher comparison threshold interval.
Referring to fig. 3, the embodiment of the present invention further discloses an overload protection apparatus, which is applied to the overload protection method, the apparatus includes a compressor MC, a power supply circuit, a controller, a first pressure detector PT1, a second pressure detector PT2, a current detector and an on-off switch KM1,
the power supply circuit is connected with the compressor MC for supplying power, the on-off device KM1 is arranged on the power supply circuit, and the on-off device KM1 is electrically connected with the controller;
the current detector is used for detecting the working current on the power supply circuit, and the current detector is electrically connected with the controller;
the first pressure detector PT1 is used for detecting a suction pressure at an air inlet when the compressor MC works, the second pressure detector PT2 is used for detecting a discharge pressure at a discharge outlet when the compressor MC works, and both the first pressure detector PT1 and the second pressure detector PT2 are electrically connected with the controller;
the controller is used for controlling the first pressure detector and the second pressure detector to respectively detect the suction pressure and the discharge pressure, calculating the pressure absolute difference value of the suction pressure and the discharge pressure, controlling and detecting the working current of the compressor at the same time, obtaining the corresponding rated current of the compressor in normal working according to the pressure absolute difference value, and calculating the current ratio of the working current to the rated current; and comparing the current ratio with a preset comparison threshold interval, and when the current ratio is continuously in the comparison threshold interval and the duration is longer than or equal to the corresponding preset duration, controlling the on-off device to stop the compressor.
Specifically, the controller calculates the current ratio of the working current of the compressor to the rated current by adopting the following method:
the controller collects the air pressure P1 at the air inlet and the air pressure P2 at the air outlet, calculates the absolute pressure difference P from P1-P2, and then substitutes the absolute pressure difference P into the following formula:
In＝0.1752×P3－0.985×P2+3.1634×P+4.7211
and obtaining In which is the rated current of the compressor during working.
And finally, the controller collects the working current, and the current ratio of the working current to the rated current can be obtained by dividing the working current by the rated current.
In addition, a comparison threshold interval and a corresponding preset time length need to be preset in the controller, and the parameter setting of the comparison threshold interval and the corresponding preset time length can be referred to above, and is not described herein again.
The controller also compares the current ratio with a comparison threshold interval, records the duration that the current ratio continuously falls into the comparison threshold interval if the current ratio is within the comparison threshold interval, and controls the on-off device KM1 to operate to switch on and off the power supply circuit to supply power to the compressor MC if the duration is greater than or equal to the preset duration, so as to protect the compressor MC from being damaged due to overload operation.
In the present embodiment, the current detector is a current transformer CT 1. Further, the power supply circuit is a three-phase power supply circuit (U, V, W), and the current transformer CT1 is configured to detect an operating current of the three-phase power supply circuit, where the operating current is a three-phase current or a single-phase current of the three-phase power supply circuit. Because the power supply circuit adopts a three-phase high-voltage power supply circuit, the current transformer CT1 is installed on one phase or three phases of the power supply circuit, the electric isolation effect can be achieved, and the damage of the device controller caused by the conduction of current to the controller in the process of measuring the circuit is avoided. Namely, the current transformer CT1 is used for measuring the current safety factor of the power supply circuit.
In this embodiment, the controller is a single board controller. The Single Board controller is also called a Single Board Computer (SBC), which is a Single Board Computer (SBC) that assembles each part of the Computer on a printed circuit Board, including a microprocessor/memory/input/output interface, as well as simple seven-segment led display, a keypad, a socket, and other external devices. The function is stronger than that of a single chip microcomputer, and the control device is suitable for controlling the production process. Can be directly operated on an experimental board and is suitable for teaching. The current transformer CT1 described above may be connected directly.
In the present embodiment, the on-off device KM1 is provided as a mechanical switch; in this other embodiment, the on-off device KM1 may also be a solid-state relay. Wherein, the mechanical switch is also called an electromechanical relay, and the mechanical switch uses a physical moving part to connect with a contact in a relay output component; a solid-state relay (SSR), which is a novel contactless switch device composed entirely of solid-state electronic components, uses the switching characteristics of the electronic components (such as switching transistors, bidirectional thyristors, and other semiconductor devices) to achieve the purpose of connecting and disconnecting the circuit in a contactless and sparkless manner, and is also called a "contactless switch". From the cost perspective, the cost of adopting the mechanical switch is lower; from the performance and the use effect, the effect of adopting the solid-state relay is better.
In summary, after the compressor operates stably, the suction pressure, the discharge pressure and the working current of the compressor during operation are detected, the pressure difference is obtained by using the suction pressure and the discharge pressure, and then the overload condition of the compressor is accurately and reliably judged through the preset data and the judgment algorithm which are arranged in the controller, if the overload multiple of the compressor current is judged to fall into the judgment threshold, the controller disconnects the breaker after a proper time delay, and cuts off the power supply circuit of the compressor, thereby playing the role of overload protection. The method combines the load characteristic of the compressor to realize accurate judgment when the compressor is overloaded, thereby realizing high reliability, high speed and accurate protection of the compressor.
While 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. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method of overload protection for a compressor, the method comprising:
controlling and detecting the suction pressure and the exhaust pressure of the compressor during working, calculating the pressure absolute difference value of the suction pressure and the exhaust pressure, and simultaneously controlling and detecting the working current of the compressor;
obtaining a rated current corresponding to the normal operation of the compressor according to the pressure absolute difference value, and calculating a current ratio of the working current to the rated current;
and comparing the current ratio with a preset comparison threshold interval, and controlling to stop the compressor when the current ratio is continuously in the comparison threshold interval and the duration is greater than or equal to the corresponding preset duration.
2. An overload protection method for a compressor according to claim 1, wherein the rated current is calculated using a predetermined calculation formula, or the rated current is correspondingly selected from a predetermined mapping table.
3. An overload protection method for a compressor according to claim 1, wherein the calculation formula is a linear function obtained by linear fitting using a plurality of sets of one-to-one correspondence pressure absolute difference values and rated currents.
4. The overload protection method for a compressor according to claim 3, wherein the comparison threshold interval includes a plurality of comparison threshold intervals, and each of the plurality of comparison threshold intervals has a corresponding preset time period.
5. An overload protection method for a compressor, as claimed in claim 4, wherein when the current ratio rises from a lower comparison threshold interval to an upper comparison threshold interval, the duration of the current ratio in the lower comparison threshold interval and the duration of the upper comparison threshold interval are recorded simultaneously; and when the current ratio value is reduced from a higher comparison threshold interval to a lower comparison threshold interval, clearing the duration of the current ratio value in the higher comparison threshold interval.
6. An overload protection apparatus, which is applied to the overload protection method according to any one of claims 1 to 5, the apparatus comprising a compressor, a power supply circuit, a controller, a first pressure detector, a second pressure detector, a current detector, and an on-off device,
the power supply circuit is connected with the compressor, the on-off device is arranged on the power supply circuit, and the on-off device is electrically connected with the controller;
the current detector is used for detecting the working current on the power supply circuit, and the current detector is electrically connected with the controller;
the first pressure detector is used for detecting the suction pressure at an air inlet when the compressor works, the second pressure detector is used for detecting the exhaust pressure at an exhaust outlet when the compressor works, and the first pressure detector and the second pressure detector are both electrically connected with the controller;
the controller is used for controlling the first pressure detector and the second pressure detector to respectively detect the suction pressure and the discharge pressure, calculating the pressure absolute difference value of the suction pressure and the discharge pressure, controlling and detecting the working current of the compressor at the same time, obtaining the corresponding rated current of the compressor in normal working according to the pressure absolute difference value, and calculating the current ratio of the working current to the rated current; and comparing the current ratio with a preset comparison threshold interval, and when the current ratio is continuously in the comparison threshold interval and the duration is longer than or equal to the corresponding preset duration, controlling the on-off device to stop the compressor.
7. An overload protection apparatus for a compressor in accordance with claim 6, wherein the current detector is provided as a current transformer.
8. An overload protection apparatus for a compressor as claimed in claim 6, wherein the controller is a single board controller.
9. The overload protection apparatus for a compressor according to claim 7, wherein the power supply circuit is configured as a three-phase power supply circuit, and the current transformer is configured to detect an operating current of the three-phase power supply circuit, the operating current being a three-phase current or a single-phase current of the three-phase power supply circuit.
10. The overload protection apparatus for a compressor according to claim 6, wherein the on-off switch is provided as a mechanical switch or a solid state relay.
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| CN112904113A (en) * | 2021-01-19 | 2021-06-04 | 深圳市海浦蒙特科技有限公司 | Method and device for detecting overload of brake resistor |
| CN112904113B (en) * | 2021-01-19 | 2022-09-20 | 深圳市海浦蒙特科技有限公司 | Method and device for detecting overload of brake resistor |
| CN114459123A (en) * | 2022-02-16 | 2022-05-10 | 上海美控智慧建筑有限公司 | Compressor efficiency reduction detection method and device, storage medium and air conditioning unit |
| CN114459123B (en) * | 2022-02-16 | 2024-06-25 | 上海美控智慧建筑有限公司 | Compressor efficiency decline detection method and device, storage medium and air conditioning unit |
| CN117879437A (en) * | 2024-03-13 | 2024-04-12 | 三一重型装备有限公司 | Control system and self-moving tail |
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| CN111120290B (en) | 2022-01-04 |
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