CN115303310A - Control method of air conditioning unit of railway vehicle, electronic device and storage medium - Google Patents
Control method of air conditioning unit of railway vehicle, electronic device and storage medium Download PDFInfo
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- CN115303310A CN115303310A CN202110498806.8A CN202110498806A CN115303310A CN 115303310 A CN115303310 A CN 115303310A CN 202110498806 A CN202110498806 A CN 202110498806A CN 115303310 A CN115303310 A CN 115303310A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D27/00—Heating, cooling, ventilating, or air-conditioning
- B61D27/0018—Air-conditioning means, i.e. combining at least two of the following ways of treating or supplying air, namely heating, cooling or ventilating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T30/00—Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
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Abstract
The application relates to a control method of a rail vehicle air conditioning unit, an electronic device and a storage medium, wherein the control method comprises the following steps: after receiving a heating request signal, acquiring a first outdoor temperature; after the first temperature is judged to be lower than the first preset temperature, determining a matched temperature difference grade according to the temperature difference information of the first temperature and the second preset temperature, and determining a corresponding preset low-temperature starting mode according to the temperature difference grade; after the compressor and the condensing fan are controlled to be started in sequence according to the corresponding preset low-temperature starting mode, detecting the high-pressure at the exhaust side of the compressor, and judging whether the high-pressure at the exhaust side is in a preset high-pressure interval or not; and determining a pressure regulating mode corresponding to the judgment result according to the judgment result of judging whether the high pressure at the exhaust side is in the preset high pressure interval, and controlling the EC centrifugal fan to operate according to the corresponding pressure regulating mode. Through the application, the problem that low-pressure protection of the compressor is easily caused by heating starting of the low-temperature environment of the air conditioning unit of the railway vehicle is solved.
Description
Technical Field
The present disclosure relates to the field of vehicle air conditioning units, and more particularly, to a control method, an electronic device, and a storage medium for a rail vehicle air conditioning unit.
Background
The heat pump air conditioning unit is popular due to the advantages of economy, energy conservation, safety and comfort, and is widely applied to the air conditioner of the railway vehicle.
The heat pump air conditioning unit in the related art is restricted by the outdoor environment temperature, when the outdoor environment temperature is reduced, the heating capacity and the energy efficiency ratio of the heat pump air conditioning unit are reduced, and when the outdoor environment temperature is lower than the limit temperature, a low-voltage protection fault occurs, so that the heat pump unit cannot work normally.
In the rail air conditioning field, for the homogeneity of guaranteeing the interior temperature field distribution of rail vehicle, the evaporimeter adopts fork row control, and when the single heating system of air conditioning unit heats the operation and starts, two evaporimeters (actually for the condenser when heating) of this single heating system are all working, so, cause condensation temperature and condensation pressure to reduce for air conditioning unit heats when starting at the low temperature, and the low pressure protection trouble appears in the compressor easily.
Aiming at the problem that low-pressure protection of a compressor is easily caused by starting of a low-temperature environment of an air conditioning unit of a railway vehicle in the related art, no effective solution is provided at present.
Disclosure of Invention
The embodiment provides a control method of a rail vehicle air conditioning unit, an electronic device and a storage medium, so as to solve the problem that starting of the rail vehicle air conditioning unit in a low-temperature environment is prone to cause low-pressure protection of a compressor in the related art.
In a first aspect, in this embodiment, a control method for a rail vehicle air conditioning unit is provided, where the rail vehicle air conditioning unit includes a control unit, and a compressor, a condensing fan, and an EC centrifugal fan that are respectively connected to the control unit in a control manner, where the condensing fan is disposed on a condenser, and the EC centrifugal fan is disposed on an evaporator, and the control method includes: the control unit acquires a first outdoor temperature after receiving a heating request signal; after judging that the first temperature is lower than a first preset temperature, the control unit determines a matched temperature difference grade according to temperature difference information of the first temperature and a second preset temperature, and determines corresponding preset low-temperature starting modes according to the temperature difference grade, wherein each preset low-temperature starting mode correspondingly sets the starting sequence of the compressor, the condensing fan and the EC centrifugal fan, sets the running frequency of the compressor and sets the high pressure of a target exhaust side of the compressor; the control unit detects the high pressure at the exhaust side of the compressor after controlling the compressor and the condensing fan to be sequentially started according to the corresponding preset low-temperature starting mode, and judges whether the high pressure at the exhaust side is in a preset high pressure interval or not; and the control unit determines a pressure regulating mode corresponding to the judgment result according to the judgment result of judging whether the high-pressure at the exhaust side is in the preset high-pressure interval, and controls the EC centrifugal fan to operate according to the corresponding pressure regulating mode.
In some embodiments, before determining the voltage regulation mode corresponding to the determination result, the control method further includes: the control unit detects whether the high-pressure at the exhaust side is greater than a preset target high-pressure, wherein the preset target high-pressure represents a high-pressure value of low-temperature starting corresponding to the preset low-temperature starting mode; and under the condition that the control unit detects that the high-pressure at the exhaust side is greater than the preset target high-pressure, the control unit controls the EC centrifugal fan to be started.
In some embodiments, the determining, by the control unit, the pressure adjustment mode corresponding to the determination result according to the determination result of whether the exhaust side high pressure is in the preset high pressure section includes: after the control unit controls the EC centrifugal fan to start, the control unit detects whether the high-pressure at the exhaust side falls to the preset high-pressure interval or not; and the control unit determines a rotating speed adjusting parameter corresponding to the pressure regulating mode according to a result of checking whether the high-pressure at the exhaust side falls to the preset high-pressure interval, adjusts the rotating speed of the EC centrifugal fan according to the rotating speed adjusting parameter, and adjusts the high-pressure at the exhaust side to the preset high-pressure interval, wherein the rotating speed adjusting parameter at least comprises a rotating speed adjusting mode.
In some embodiments, the determining, by the control unit, a rotation speed adjustment parameter corresponding to the pressure adjustment mode according to a result of checking whether the high-pressure on the exhaust side falls within the preset high-pressure interval, and adjusting the rotation speed of the EC centrifugal fan according to the rotation speed adjustment parameter includes: when the control unit detects that the high-pressure of the exhaust side does not fall into the preset high-pressure interval, determining that the rotating speed adjusting mode comprises a rotating speed increasing mode, increasing the rotating speed of the EC centrifugal fan according to a preset rotating speed increasing value, and controlling the EC centrifugal fan to operate at the increased first rotating speed; the control unit controls the EC centrifugal fan to operate according to the rated maximum rotating speed when detecting that the rotating speed of the EC centrifugal fan is increased to the rated maximum rotating speed and the high-pressure at the exhaust side does not fall to the preset high-pressure interval; when detecting that the high-pressure at the exhaust side is in the preset high-pressure interval, the control unit controls the EC centrifugal fan to operate at a current third rotating speed; and when detecting that the high pressure at the exhaust side is smaller than the lower limit of the preset high pressure interval, the control unit determines that the rotating speed adjusting mode comprises rotating speed reduction, reduces the EC centrifugal fan to rotate according to a preset rotating speed drop value, and controls the EC centrifugal fan to operate according to the reduced second rotating speed.
In some of these embodiments, adjusting the rotational speed of the EC centrifugal fan according to the rotational speed adjustment parameter comprises: and the control unit performs PID control on the rotating speed of the EC centrifugal fan according to the rotating speed adjusting parameter.
In some of these embodiments, the control unit controls the EC centrifugal fan, the condensing fan, and the compressor to be sequentially started in a case where the control unit determines that the first temperature is not lower than a first preset temperature.
In some embodiments, after the control unit controls the compressor and the condensing fan to start sequentially according to the corresponding preset low-temperature start mode, the control method further includes: the control unit detects the running time of the compressor and the condensing fan after being started in sequence, and controls the compressor, the condensing fan and the EC centrifugal fan to exit the preset low-temperature starting mode under the condition that the running time is detected to be greater than first preset time.
In some of these embodiments, the control unit controls the compressor, the condenser fan, and the EC centrifugal fan to exit the preset low temperature start mode when the control unit detects that the exhaust side high pressure is greater than a preset high pressure protection threshold.
In a second aspect, in the present embodiment, an electronic device is provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the processor implements the control method of the air conditioning unit for a rail vehicle according to the first aspect.
In a fourth aspect, in the present embodiment, there is provided a storage medium having stored thereon a computer program which, when executed by a processor, implements the method of controlling a rail vehicle air conditioning unit of the first aspect described above.
Compared with the related art, the control method, the electronic device and the storage medium of the air conditioning unit for the rail vehicle provided in the embodiment acquire the outdoor first temperature after receiving the heating request signal through the control unit; after judging that the first temperature is lower than the first preset temperature, the control unit determines a matched temperature difference grade according to the temperature difference information of the first temperature and the second preset temperature, and determines corresponding preset low-temperature starting modes according to the temperature difference grade, wherein each preset low-temperature starting mode correspondingly sets the starting sequence of the compressor, the condensing fan and the EC centrifugal fan, sets the running frequency of the compressor and sets the target high-pressure of the exhaust side of the compressor; the control unit detects the high pressure at the exhaust side of the compressor after controlling the compressor and the condensing fan to start in sequence according to the corresponding preset low-temperature starting mode, and judges whether the high pressure at the exhaust side is in a preset high pressure interval or not; the control unit determines a pressure regulating mode corresponding to the judgment result according to the judgment result of judging whether the high pressure of the exhaust side is in the preset high pressure range or not, and controls the EC centrifugal fan to operate according to the corresponding pressure regulating mode, so that the problem that the low-pressure protection of the compressor is easily caused by the starting of the air conditioning unit of the railway vehicle in the low-temperature environment is solved, the stable operation of the full air volume in the starting stage of the air conditioning unit of the railway vehicle in the low-temperature environment is realized, and the low-pressure protection of the compressor of the air conditioning unit of the railway vehicle is prevented.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more concise and understandable description of the application, and features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a structural view of a rail vehicle air conditioning unit according to an embodiment of the present application.
Fig. 2 is a flowchart of a control method of a rail vehicle air conditioning unit according to an embodiment of the present application.
Fig. 3 is a first flowchart of a control method of a rail vehicle air conditioning unit according to a preferred embodiment of the present application.
Fig. 4 is a second flowchart of a control method of a rail vehicle air conditioning unit according to a preferred embodiment of the present application.
Detailed Description
For a clearer understanding of the objects, aspects and advantages of the present application, reference is made to the following description and accompanying drawings.
Unless defined otherwise, technical or scientific terms used herein shall have the same general meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The use of the terms "a" and "an" and "the" and similar referents in the context of this application do not denote a limitation of quantity, either in the singular or the plural. The terms "comprises," "comprising," "has," "having," and any variations thereof, as referred to in this application, are intended to cover non-exclusive inclusions; for example, a process, method, and system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or modules, but may include other steps or modules (elements) not listed or inherent to such process, method, article, or apparatus. Reference in this application to "connected," "coupled," and the like is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Reference to "a plurality" in this application means two or more. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. In general, the character "/" indicates a relationship in which the objects associated before and after are an "or". The terms "first," "second," "third," and the like in this application are used for distinguishing between similar items and not necessarily for describing a particular sequential or chronological order.
Fig. 1 is a structural view of a rail vehicle air conditioning unit according to an embodiment of the present application. As shown in fig. 1, the air conditioning unit for a railway vehicle according to the embodiment of the present disclosure at least includes a compressor 1, a condensing fan 2, and an EC centrifugal fan 3, where the condensing fan 2 is disposed on a condenser 4, and the EC centrifugal fan 3 is disposed on an evaporator 5. Of course, the air conditioning unit for the rail vehicle in the embodiment of the present application further includes other components and modules for cooling or heating the vehicle, for example: the device comprises a frequency converter 6, an air purifier 7, an air return valve 8, a fresh air pressure wave valve 9, a four-way reversing valve 10, a gas-liquid separator 11, a waste discharge pressure wave valve 12 and a waste exhaust valve 13. The air conditioning unit in this application embodiment is through dispose EC centrifugal fan 3 in this application embodiment on current heat pump set and constitute, consequently, satisfies to all be fit for the rail vehicle air conditioning unit in this application embodiment for the air conditioning unit that rail vehicle refrigerates or heat. Meanwhile, a control unit for executing the control method in the embodiment of the present application is not shown in fig. 1, the control unit is electrically connected with the compressor 100, the condensing fan 200 and the EC centrifugal fan 300 in a control manner, and the control unit in the embodiment of the present application controls the compressor 100, the condensing fan 200 and the EC centrifugal fan 300 to establish a stable high-low pressure difference in a low-temperature environment, so as to prevent low-pressure protection from occurring in a start-up stage of the air conditioning unit of the rail vehicle.
In this embodiment, a control method for a rail vehicle air conditioning unit is provided, and is applied to the rail vehicle air conditioning unit shown in fig. 1, and fig. 2 is a flowchart of the control method for the rail vehicle air conditioning unit according to the embodiment of the present application, and as shown in fig. 2, the flowchart includes the following steps:
in step S201, the control unit obtains a first outdoor temperature after receiving the heating request signal.
In this embodiment, the ambient temperature of the heating condition adapted to the air conditioning unit of the rail vehicle is below zero, and therefore the control unit receives the heating request; meanwhile, in the embodiment of the application, the control unit detects the outdoor temperature through the temperature sensor, detects that the first outdoor temperature is below zero, the air conditioning unit of the railway vehicle operates in a low-temperature environment, and controls and executes a low-temperature heating starting stage.
Step S202, after judging that the first temperature is lower than the first preset temperature, the control unit determines a matched temperature difference grade according to temperature difference information of the first temperature and the second preset temperature, and determines corresponding preset low-temperature starting modes according to the temperature difference grade, wherein each preset low-temperature starting mode correspondingly sets the starting sequence of the compressor, the condensing fan and the EC centrifugal fan, sets the running frequency of the compressor and sets the high pressure of the target exhaust side of the compressor.
In this embodiment, the first preset temperature is an upper threshold of the environmental temperature determined by the low-temperature heating start mode in this embodiment, and when the environmental temperature is lower than the first preset temperature, starting the air conditioning unit of the rail vehicle is performed according to the low-temperature heating start mode.
In this embodiment, after the first temperature is lower than the first preset temperature, the corresponding temperature difference level needs to be determined according to the temperature difference between the first temperature of the current environment and the preset low-temperature heating starting environment temperature threshold, that is, the temperature difference with the second preset temperature, and each temperature difference level is associated with a corresponding preset low-temperature starting mode, for example: when the temperature grade determined according to the temperature difference between the first temperature and the second preset temperature is grade I, and the preset low-temperature starting mode corresponding to the temperature difference grade of grade I is a low-temperature starting mode A, the air conditioning unit of the railway vehicle is started according to the low-temperature starting mode A.
In this embodiment, referring to the following table, the correlation between the temperature difference level and the first temperature, the second predetermined temperature, and the low-temperature start mode is as follows:
| serial number | Temperature difference information | Grade of temperature difference | Low temperature start mode |
| 1 | b＜t＜a | Ⅰ | A |
| 2 | c＜t＜b | Ⅱ | B |
| 3 | t＜c | Ⅲ | C |
In some optional embodiments, the corresponding preset low-temperature start mode is determined, and the start mode of the air conditioning unit of the rail vehicle may be determined to be the preset low-temperature start mode corresponding to the second preset temperature by comparing the first temperature with a plurality of set second preset temperatures and by determining whether the second temperature is lower than the corresponding second preset temperature, for example: and setting second preset temperatures corresponding to the low-temperature starting mode B and the low-temperature starting mode C as B and C respectively, and when the first temperature is lower than the first preset temperature, the second temperature is still lower than the second preset temperature B but higher than the second preset temperature C, determining that the starting mode of the air conditioning unit of the railway vehicle corresponds to the low-temperature starting mode B.
In this embodiment, the compressor is an inverter compressor, the compressor frequency defined by each low-temperature start mode is the highest frequency of the compressor operation set in the corresponding low-temperature start mode, within the highest frequency, the rotation speed of the compressor does not cause the low-pressure on the suction side of the compressor to be too low, and within the highest frequency, the rotation speed of the corresponding compressor is suitable for the low-temperature start mode, wherein the highest frequency is determined according to the lowest value of the low-pressure in the low-temperature start stage, and meanwhile, the highest frequency value is reduced as the second preset temperature corresponding to the low-temperature start mode is reduced.
And step S203, after the control unit controls the compressor and the condensing fan to be sequentially started according to the corresponding preset low-temperature starting mode, detecting the high-pressure at the exhaust side of the compressor, and judging whether the high-pressure at the exhaust side is in a preset high-pressure interval.
In this embodiment, when the first temperature matches a second preset temperature defined by a corresponding low-temperature start mode, the condensing fan and the compressor are sequentially started, the EC centrifugal fan is started in a delayed manner, after the condensing fan and the compressor are started, the high-pressure at the exhaust side of the compressor is gradually increased, and the control unit correspondingly controls the start and the rotation speed adjustment of the EC centrifugal fan by checking the high-pressure at the exhaust side of the compressor and comparing the high-pressure at the exhaust side with a set high-pressure threshold.
And step S204, the control unit determines a pressure regulating mode corresponding to the judgment result according to the judgment result of judging whether the high-pressure at the exhaust side is in the preset high-pressure interval, and controls the EC centrifugal fan to operate according to the corresponding pressure regulating mode.
In the embodiment of the application, the preset high-pressure interval is determined according to stable high-pressure values during heating operation of different outdoor temperature systems, namely, the high-pressure of the exhaust side is controlled to be equal to the high-pressure of the exhaust side at the temperature during the heating operation stage, so that the pressure difference between the exhaust side of the compressor and the suction side of the compressor is established during the low-temperature starting stage of the air conditioning unit of the railway vehicle, the low-pressure is ensured to be at a set safety value, the low-pressure protection caused by the pressure drop generated when the EC centrifugal fan is started to be a low-pressure protection value is avoided, and the pressure drop is slowed down and stopped by controlling the EC centrifugal fan before the low-pressure reaches the low-pressure protection value.
In this embodiment, after the corresponding determination result is determined, the rotation speed of the EC centrifugal fan is correspondingly controlled, that is, the operation of the EC centrifugal fan in the corresponding pressure regulation mode at least includes controlling the rotation speed of the EC centrifugal fan; in the embodiment of the application, before the judgment of the rotation speed control of the EC centrifugal fan, the judgment of the starting control of the EC centrifugal fan is also carried out; therefore, the step of controlling the EC centrifugal fan to operate according to the corresponding pressure regulating mode comprises the steps of controlling the starting of the EC centrifugal fan and controlling the rotating speed of the EC centrifugal fan; in this embodiment, the start control of the EC centrifugal fan is determined by comparing the high pressure at the exhaust side with a preset target high pressure, and when the high pressure at the exhaust side is greater than the preset target high pressure, the EC centrifugal fan is controlled to start. Through the steps S201 to S204, after receiving the heating request signal, the control unit obtains the outdoor first temperature; after judging that the first temperature is lower than the first preset temperature, the control unit determines a matched temperature difference grade according to temperature difference information of the first temperature and the second preset temperature, and determines corresponding preset low-temperature starting modes according to the temperature difference grade, wherein each preset low-temperature starting mode correspondingly sets the starting sequence of the compressor, the condensing fan and the EC centrifugal fan, sets the running frequency of the compressor and sets the target exhaust side high-pressure of the compressor; the control unit detects the high pressure at the exhaust side of the compressor after controlling the compressor and the condensing fan to start in sequence according to the corresponding preset low-temperature starting mode, and judges whether the high pressure at the exhaust side is in a preset high pressure interval or not; the control unit determines a pressure regulating mode corresponding to the judgment result according to the judgment result of judging whether the high-pressure of the exhaust side is in the preset high-pressure interval or not, and controls the EC centrifugal fan to operate according to the corresponding pressure regulating mode, so that the problem that the low-pressure protection of the compressor is easily caused by the starting of the air conditioning unit of the rail vehicle in the low-temperature environment is solved, the stable operation of the full air volume of the air conditioning unit of the rail vehicle in the starting stage in the low-temperature environment is realized, and the low-pressure protection of the compressor of the air conditioning unit of the rail vehicle is prevented.
In some embodiments, before determining the pressure discharge mode corresponding to the determination result, the following steps are further performed:
step 1, a control unit detects whether the high-pressure at the exhaust side is greater than a preset target high-pressure, wherein the preset target high-pressure represents a high-pressure value of low-temperature starting corresponding to a preset low-temperature starting mode.
In this embodiment, the preset target high-pressure is determined according to high-low pressure curves of heating start at different indoor and outdoor temperatures, and the preset target high-pressure is greater than the upper limit of the preset high-pressure interval.
And 2, controlling the EC centrifugal fan to start by the control unit under the condition that the control unit detects that the high-pressure of the exhaust side is greater than the preset target high-pressure.
Detecting whether the high pressure at the exhaust side is greater than a preset target high pressure or not by the control unit in the step; under the condition that the control unit detects that the high-pressure of the exhaust side is greater than the preset target high-pressure, the control unit controls the EC centrifugal fan to start, so that the EC centrifugal fan is controlled to start according to the comparison result of the high-pressure of the exhaust side and the target high-pressure, and pressure difference between the exhaust side of the compressor and the suction side of the compressor is established at the low-temperature starting stage of the air conditioning unit of the railway vehicle, so that the low-pressure is ensured to be at a set safety value, and the low-pressure protection caused by the fact that the pressure drop generated when the EC centrifugal fan is started is reduced to a low-pressure protection value is avoided.
In some embodiments, the control unit determines, according to a determination result of determining whether the high pressure on the exhaust side is in the preset high pressure interval, that the pressure regulation mode corresponding to the determination result is implemented by:
step 1, after the control unit controls the EC centrifugal fan to start, the control unit detects whether the high-pressure at the exhaust side falls to a preset high-pressure interval.
And 2, determining a rotating speed adjusting parameter corresponding to the pressure adjusting mode by the control unit according to a result of checking whether the high-pressure at the exhaust side falls to a preset high-pressure interval, adjusting the rotating speed of the EC centrifugal fan according to the rotating speed adjusting parameter, and adjusting the high-pressure at the exhaust side to the preset high-pressure interval, wherein the rotating speed adjusting parameter at least comprises a rotating speed adjusting mode.
In this embodiment, the high pressure at the exhaust side is greater than the preset target high pressure, and the EC centrifugal fan is started, but the high pressure at the exhaust side is reduced due to the start of the EC centrifugal fan, so that after the EC centrifugal fan is started, the high pressure at the exhaust side is detected, and the rotation speed of the EC centrifugal fan is controlled by detecting whether the high pressure at the exhaust side is within the preset high pressure interval, so that a pressure difference between the exhaust side of the compressor and the suction side of the compressor is established at the low-temperature start stage of the air conditioning unit of the rail vehicle, thereby ensuring that the low pressure is at the set safety value.
In this embodiment, although the exhaust side high pressure is reduced after the EC centrifugal fan is started, the exhaust side high pressure does not fall to a preset high pressure interval within a period of time after the EC centrifugal fan is started, and therefore the exhaust side high pressure needs to be rapidly reduced to the preset high pressure interval by increasing the rotation speed of the EC centrifugal fan; when the high pressure at the exhaust side is reduced to a preset high pressure interval, the high pressure at the exhaust side is reduced to be maintained in the preset high pressure interval or lower than the lower limit of the preset high pressure interval due to the operation of the EC centrifugal fan, at the moment, the rotating speed of the EC centrifugal fan needs to be controlled to be reduced, so that the reduced pressure value of the high pressure at the exhaust side generated by the operation of the EC centrifugal fan is not larger than the increased value of the high pressure at the exhaust side generated by the operation of the compressor and the condensing fan, and the high pressure at the exhaust side is maintained in the preset high pressure interval.
In this embodiment, the rotation speed of the EC centrifugal fan is controlled, and the exhaust side high pressure is correspondingly adjusted, so that in this embodiment, the rotation speed adjustment parameter includes a rotation speed adjustment mode and a rotation speed adjustment value corresponding to the rotation speed adjustment mode, where the rotation speed adjustment mode includes increasing the rotation speed and decreasing the rotation speed, and the corresponding rotation speed adjustment value includes a preset rotation speed increase value and a preset rotation speed drop value.
After the control unit controls the EC centrifugal fan to start in the steps, the control unit detects whether the high-pressure at the exhaust side falls to a preset high-pressure interval; the control unit determines a rotating speed adjusting parameter corresponding to the pressure adjusting mode according to the result of checking whether the high-pressure at the exhaust side falls to the preset high-pressure interval or not, adjusts the rotating speed of the EC centrifugal fan according to the rotating speed adjusting parameter, adjusts the high-pressure at the exhaust side to the preset high-pressure interval, and realizes the comparison result of the high-pressure at the exhaust side and the target high-pressure, the rotating speed of the EC centrifugal fan is adjusted, so that pressure difference exists between the exhaust side of the compressor and the suction side of the compressor at the low-temperature starting stage of the air conditioning unit of the railway vehicle, the low-pressure is ensured to be at a set safety value, and the low-pressure protection caused by the pressure drop generated when the EC centrifugal fan is started to be a low-pressure protection value is avoided.
In some embodiments, the control unit determines a rotation speed adjustment parameter corresponding to the pressure adjustment mode according to a result of checking whether the high-pressure on the exhaust side falls to a preset high-pressure interval, and adjusts the rotation speed of the EC centrifugal fan according to the rotation speed adjustment parameter by the following steps:
step 1, when detecting that the high-pressure at the exhaust side does not fall into a preset high-pressure interval, a control unit determines a rotation speed adjusting mode including a lifting rotation speed, lifts the rotation speed of the EC centrifugal fan according to a preset rotation speed lifting value, and controls the EC centrifugal fan to operate according to the lifted first rotation speed.
In this embodiment, when the high pressure at the exhaust side is higher than the upper limit of the preset high pressure interval, the rotation speed of the EC centrifugal fan is increased according to the preset rotation speed increase value, so that the high pressure at the exhaust side is rapidly reduced to the preset high pressure interval, and the track air conditioning unit can stably operate at full air volume.
And 2, controlling the EC centrifugal fan to operate at the rated maximum rotating speed by the control unit when detecting that the rotating speed of the EC centrifugal fan is increased to the rated maximum rotating speed and the high-pressure at the exhaust side does not fall to a preset high-pressure interval.
In this embodiment, when the EC centrifugal fan increases the rotation speed to the rated maximum rotation speed, and the high pressure on the exhaust side still cannot be reduced to the preset high pressure interval, the EC centrifugal fan is controlled to operate at the rated maximum rotation speed, so that the high pressure on the exhaust side is reduced to the preset high pressure interval after the EC centrifugal fan operates for the preset time.
And 3, controlling the EC centrifugal fan to operate at the current third rotating speed by the control unit when detecting that the high-pressure at the exhaust side is in the preset high-pressure interval.
In this embodiment, when the EC centrifugal fan operates at the current third rotation speed, the rotation speed of the EC centrifugal fan is the rotation speed of the EC centrifugal fan when the control unit detects whether the high-pressure at the exhaust side is in the preset high-pressure interval, and in some optional embodiments, the third rotation speed includes one of the first rotation speed and the second rotation speed.
And 4, when detecting that the high-pressure at the exhaust side is smaller than the preset high-pressure interval, the control unit determines a rotation speed adjusting mode comprising reducing the rotation speed, reducing the rotation of the EC centrifugal fan according to a preset rotation speed drop value, and controlling the EC centrifugal fan to operate according to the reduced second rotation speed.
In this embodiment, after the high pressure at the exhaust side is reduced to the preset high pressure interval, the high pressure at the exhaust side is reduced to a value where the generated low pressure is lower than the safety value due to the operation of the EC centrifugal fan, and the low pressure protection is performed on the air conditioning unit of the rail vehicle at the start stage, at this time, the rotation speed of the EC centrifugal fan needs to be controlled to be reduced, so that the reduced pressure value of the high pressure at the exhaust side generated by the operation of the EC centrifugal fan is not greater than the increased value of the high pressure at the exhaust side generated by the operation of the compressor and the condensing fan, and thus, the high pressure at the exhaust side is maintained within the preset high pressure interval. In some embodiments, adjusting the rotation speed of the EC centrifugal fan according to the rotation speed adjustment parameter is implemented as follows: and the control unit performs PID control on the rotating speed of the EC centrifugal fan according to the rotating speed adjusting parameter.
In the embodiment, the PID control is adopted to realize the accurate control of the rotating speed of the EC centrifugal fan and the stepless speed regulation.
In some of these embodiments, the following steps are also implemented: and under the condition that the control unit judges that the first temperature is not lower than the first preset temperature, the control unit controls the EC centrifugal fan, the condensing fan and the compressor to be started in sequence.
In this embodiment, when the control unit determines that the first temperature is not lower than the first preset temperature, that is, the ambient temperature is not lower than the first preset temperature, it indicates that the condition for performing the preset low-temperature start mode is not met, and at this time, the control unit starts the EC centrifugal fan, the condensing fan and the compressor in the normal mode and correspondingly controls the EC centrifugal fan, the condensing fan and the compressor to start in sequence.
In some of these embodiments, the air conditioning unit for a rail vehicle further implements the following process steps, and fig. 3 is a first flowchart of a control method of the air conditioning unit for a rail vehicle according to a preferred embodiment of the present application, and as shown in fig. 3, the process includes the following steps:
in step S301, after receiving the heating request signal, the control unit obtains a first outdoor temperature.
Step S302, after judging that the first temperature is lower than the first preset temperature, the control unit determines a matched temperature difference grade according to the temperature difference information between the first temperature and the second preset temperature, and determines corresponding preset low-temperature starting modes according to the temperature difference grade, wherein each preset low-temperature starting mode correspondingly sets the starting sequence of the compressor, the condensing fan and the EC centrifugal fan, sets the running frequency of the compressor and sets the target high-pressure on the exhaust side of the compressor.
And step S303, after the control unit controls the compressor and the condensing fan to be sequentially started according to the corresponding preset low-temperature starting mode, detecting the high-pressure at the exhaust side of the compressor, and judging whether the high-pressure at the exhaust side is in a preset high-pressure interval.
And step S304, the control unit determines a pressure regulating mode corresponding to the judgment result according to the judgment result of judging whether the high pressure at the exhaust side is in the preset high pressure interval, and controls the EC centrifugal fan to operate according to the corresponding pressure regulating mode.
In step S305, the control unit detects an operation time after the compressor and the condensing fan are sequentially started, and controls the compressor, the condensing fan and the EC centrifugal fan to exit the preset low-temperature start mode when the operation time is detected to be greater than a first preset time.
In this embodiment, by setting the time exit mode, after the low-temperature start mode operates for the preset time threshold, the low-temperature start mode exits, and the heating operation mode enters, and after the heating operation mode enters, the rotation speed of the EC centrifugal fan is controlled according to the target high-pressure corresponding to the current temperature, so that the high-pressure at the exhaust side of the compressor is matched with the target high-pressure corresponding to the current temperature.
In some of these embodiments, the air conditioning unit for a rail vehicle further implements the following process steps, and fig. 4 is a second flowchart of a control method of the air conditioning unit for a rail vehicle according to a preferred embodiment of the present application, and as shown in fig. 4, the process includes the following steps:
in step S401, after receiving the heating request signal, the control unit obtains a first outdoor temperature.
Step S402, after judging that the first temperature is lower than the first preset temperature, the control unit determines a matched temperature difference grade according to temperature difference information of the first temperature and the second preset temperature, and determines corresponding preset low-temperature starting modes according to the temperature difference grade, wherein each preset low-temperature starting mode correspondingly sets the starting sequence of the compressor, the condensing fan and the EC centrifugal fan, sets the running frequency of the compressor and sets the high pressure of the target exhaust side of the compressor.
And S403, after the control unit controls the compressor and the condensing fan to be sequentially started according to the corresponding preset low-temperature starting mode, detecting the high-pressure of the exhaust side of the compressor and judging whether the high-pressure of the exhaust side is in a preset high-pressure interval.
And step S404, the control unit determines a pressure regulating mode corresponding to the judgment result according to the judgment result of judging whether the high-pressure at the exhaust side is in the preset high-pressure interval, and controls the EC centrifugal fan to operate according to the corresponding pressure regulating mode.
And step S405, when the control unit detects that the high-pressure at the exhaust side is greater than a preset high-pressure protection threshold value, controlling the compressor, the condensing fan and the EC centrifugal fan to exit a preset low-temperature starting mode.
In this embodiment, by setting the high-pressure exit mode, when the high-pressure on the exhaust side is greater than the high-pressure exit protection value, the low-temperature start mode is exited, and the heating operation mode is entered, and when the heating operation mode is entered, the rotation speed of the EC centrifugal fan is controlled according to the target high-pressure corresponding to the current temperature, so that the high-pressure on the exhaust side of the compressor is matched with the target high-pressure corresponding to the current temperature.
There is also provided in this embodiment an electronic device comprising a memory having a computer program stored therein and a processor configured to execute the computer program to perform the steps of any of the method embodiments described above.
Optionally, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.
Optionally, in this embodiment, the processor may be configured to execute the following steps by a computer program:
s1, after receiving a heating request signal, acquiring a first outdoor temperature.
And S2, after the first temperature is judged to be lower than the first preset temperature, determining a matched temperature difference grade according to the temperature difference information of the first temperature and the second preset temperature, and determining a corresponding preset low-temperature starting mode according to the temperature difference grade.
And S3, after the compressor and the condensing fan are controlled to be sequentially started according to the corresponding preset low-temperature starting mode, detecting the high-pressure at the exhaust side of the compressor, and judging whether the high-pressure at the exhaust side is in a preset high-pressure interval.
And S4, determining a pressure regulating mode corresponding to the judgment result according to the judgment result of judging whether the high-pressure of the exhaust side is in the preset high-pressure interval, and controlling the EC centrifugal fan to operate according to the corresponding pressure regulating mode.
It should be noted that, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and optional implementations, and details are not described again in this embodiment.
In addition, in combination with the control method of the air conditioning unit for the rail vehicle provided in the above embodiment, a storage medium may also be provided to implement in this embodiment. The storage medium has a computer program stored thereon; the computer program, when executed by a processor, implements any one of the above-described embodiments of a method of controlling a rail vehicle air conditioning unit.
It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to be limiting. All other embodiments, which can be derived by a person skilled in the art from the examples provided herein without any inventive step, shall fall within the scope of protection of the present application.
It is obvious that the drawings are only examples or embodiments of the present application, and it is obvious to those skilled in the art that the present application can be applied to other similar cases according to the drawings without creative efforts. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
The term "embodiment" is used herein to mean that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of such phrases 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. It is to be expressly and implicitly understood by one of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the patent protection. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. A control method of a rail vehicle air conditioning unit comprises a control unit, a compressor, a condensation fan and an EC centrifugal fan, wherein the compressor, the condensation fan and the EC centrifugal fan are respectively in control connection with the control unit, the condensation fan is arranged on a condenser, and the EC centrifugal fan is arranged on an evaporator, and the control method comprises the following steps:
the control unit acquires a first outdoor temperature after receiving a heating request signal;
after judging that the first temperature is lower than a first preset temperature, the control unit determines a matched temperature difference grade according to temperature difference information of the first temperature and a second preset temperature, and determines corresponding preset low-temperature starting modes according to the temperature difference grade, wherein each preset low-temperature starting mode correspondingly sets the starting sequence of the compressor, the condensing fan and the EC centrifugal fan, sets the running frequency of the compressor and sets the high pressure of a target exhaust side of the compressor;
the control unit detects the high pressure at the exhaust side of the compressor after controlling the compressor and the condensing fan to be sequentially started according to the corresponding preset low-temperature starting mode, and judges whether the high pressure at the exhaust side is in a preset high pressure interval or not;
and the control unit determines a pressure regulating mode corresponding to the judgment result according to the judgment result of judging whether the high-pressure at the exhaust side is in the preset high-pressure interval, and controls the EC centrifugal fan to operate according to the corresponding pressure regulating mode.
2. The method of claim 1, wherein prior to determining the pressure regulation mode corresponding to the determination, the method further comprises:
the control unit detects whether the high-pressure at the exhaust side is greater than a preset target high-pressure, wherein the preset target high-pressure represents a high-pressure value of low-temperature starting corresponding to the preset low-temperature starting mode;
and under the condition that the control unit detects that the high-pressure at the exhaust side is greater than the preset target high-pressure, the control unit controls the EC centrifugal fan to be started.
3. The control method of the air conditioning unit for the railway vehicle as claimed in claim 2, wherein the determining, by the control unit, the pressure adjusting mode corresponding to the determination result according to the determination result of whether the high pressure on the exhaust side is in the preset high pressure section comprises:
after the control unit controls the EC centrifugal fan to start, the control unit detects whether the high-pressure on the exhaust side falls to the preset high-pressure interval;
and the control unit determines a rotating speed adjusting parameter corresponding to the pressure regulating mode according to a result of checking whether the high-pressure at the exhaust side falls to the preset high-pressure interval, adjusts the rotating speed of the EC centrifugal fan according to the rotating speed adjusting parameter, and adjusts the high-pressure at the exhaust side to the preset high-pressure interval, wherein the rotating speed adjusting parameter at least comprises a rotating speed adjusting mode.
4. The control method of the air conditioning unit for the railway vehicle as claimed in claim 3, wherein the determining, by the control unit, the rotation speed adjustment parameter corresponding to the pressure adjustment mode according to the result of checking whether the high pressure at the exhaust side falls within the preset high pressure interval, and the adjusting the rotation speed of the EC centrifugal fan according to the rotation speed adjustment parameter comprises:
when the control unit detects that the high-pressure at the exhaust side does not fall into the preset high-pressure interval, determining that the rotating speed adjusting mode comprises a lifting rotating speed, lifting the rotating speed of the EC centrifugal fan according to a preset rotating speed lifting value, and controlling the EC centrifugal fan to operate according to the lifted first rotating speed;
the control unit controls the EC centrifugal fan to operate according to the rated maximum rotating speed when detecting that the rotating speed of the EC centrifugal fan is increased to the rated maximum rotating speed and the high-pressure at the exhaust side does not fall to the preset high-pressure interval;
when detecting that the high-pressure at the exhaust side is in the preset high-pressure interval, the control unit controls the EC centrifugal fan to operate at a current third rotating speed;
and when detecting that the high-pressure at the exhaust side is smaller than the lower limit of the preset high-pressure interval, the control unit determines that the rotating speed adjusting mode comprises rotating speed reduction, reduces the rotation of the EC centrifugal fan according to a preset rotating speed drop value, and controls the EC centrifugal fan to operate according to a reduced second rotating speed.
5. The control method of a rail vehicle air conditioning unit according to claim 3, wherein adjusting the rotational speed of the EC centrifugal fan according to the rotational speed adjustment parameter includes: and the control unit performs PID control on the rotating speed of the EC centrifugal fan according to the rotating speed adjusting parameter.
6. The control method of the air conditioning unit for the railway vehicle as claimed in claim 1, wherein the control unit controls the EC centrifugal fan, the condensing fan and the compressor to be sequentially started in case that the control unit determines that the first temperature is not lower than a first preset temperature.
7. The control method of the air conditioning unit for the railway vehicle as claimed in claim 1, wherein after the control unit controls the compressor and the condensing fan to be sequentially started in the corresponding preset low-temperature starting mode, the control method further comprises:
the control unit detects the running time of the compressor and the condensing fan after being started in sequence, and controls the compressor, the condensing fan and the EC centrifugal fan to exit the preset low-temperature starting mode under the condition that the running time is detected to be greater than first preset time.
8. The control method of a rail vehicle air conditioning unit as claimed in claim 1, wherein the control unit controls the compressor, the condensing fan and the EC centrifugal fan to exit the preset low temperature start mode when detecting that the discharge side high pressure is greater than a preset high pressure protection threshold.
9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to perform the method for controlling a rail vehicle air conditioning unit according to any one of claims 1 to 8.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for controlling a rail vehicle air conditioning unit according to any one of claims 1 to 8.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116914317A (en) * | 2023-08-10 | 2023-10-20 | 无锡柯诺威新能源科技有限公司 | Low-temperature starting method of energy storage thermal management system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116914317A (en) * | 2023-08-10 | 2023-10-20 | 无锡柯诺威新能源科技有限公司 | Low-temperature starting method of energy storage thermal management system |
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