Frequency conversion wind source device for motor train unit, control method and system

Abstract

The invention provides a frequency conversion air source device for a motor train unit and a control method and system. The frequency conversion air source device comprises an air inlet filter, a frequency converter, a compressor motor, a compressor head, a cooler, a double-tower dryer, a precision filter, an electronic control unit and a temperature and pressure sensor. Ambient air enters the machine head of the compressor through the air inlet filter to be compressed and then is treated by the cooler, the dryer and the precision filter in sequence, and the ambient air enters downstream air equipment after the air quality required by the vehicle air equipment is achieved. The electronic control unit controls the frequency converter to output a compressor motor rotating speed control signal according to a temperature and pressure signal collected by the temperature and pressure sensor so as to adjust the rotating speed of the compressor motor and the displacement of the compressor; and controlling the rotating speed of the cooling fan motor according to the temperature-pressure signal and the compressor motor rotating speed control signal to adjust the cooling air volume of the cooler. The air displacement of the air source device, the working temperature of the lubricating oil and switching of the double-tower dryers can be automatically adjusted according to the operation environment of the vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit locomotive vehicles, and particularly relates to a variable-frequency air source device for a motor train unit, a control method and a system. BACKGROUND

[0002] The air source device is a key component for providing clean compressed air for a rail transit vehicle. The compressed air generated by the air source device is used not only for the air brake system of the vehicle, but also for the pantograph system, sanding system, electric air control system and air spring of the vehicle, and other auxiliary air equipment. The air source device generally includes an air compressor unit, an air purification unit, a bearing unit and an electrical control unit. Among them, the air compressor unit is the core component of the air source device. As a vehicle-mounted device, the air source device should have the characteristics of small size, light weight, good reliability and easy maintenance.

[0003] At present, the main type of air compressor unit for rail vehicles is an oil-injected double-screw air compressor unit and an oil-lubricated reciprocating piston air compressor unit. Both of them belong to positive displacement compressors and are driven by fixed-speed motors. The volumetric flow rate is a core technical index of the air source device. The volumetric flow rate generally refers to the volume flow rate. When designing the vehicle, the air consumption of the vehicle needs to be calculated to select the appropriate volumetric flow rate of the air source device. The volumetric flow rate of the air source device needs to meet the requirements of initial air charging and daily air use of the vehicle, and also needs to blow back the dryer to regenerate the drying agent. Considering the influence of factors such as volume weight and lubricating oil, the volumetric flow rate of the air compressor unit should not be too large.

[0004] But for the selected air compressor, the volumetric flow is not constant, and the volumetric flow will change with the factors such as the intake pressure, the intake temperature, the exhaust pressure and the cooling condition. For example, a rail vehicle travels from a plain area to a plateau area. With the increase of the altitude, the atmospheric pressure decreases, that is, the intake pressure of the air compressor unit decreases. This will cause the exhaust volume of the air compressor unit to decrease and the power consumption to increase. This is because the decrease of the intake pressure will increase the compression ratio of the air compressor unit at the same exhaust pressure (gauge pressure), and the volumetric efficiency of the compressor unit will decrease accordingly. In order to make the air supply equipment of the vehicle running in the high-altitude area have the same working performance as that of the vehicle running in the low-altitude area, the air compressor unit with a larger displacement should be selected for the vehicle running in the high-altitude area. For example, when a medium-sized air-cooled reciprocating compressor is used at an altitude of 3000 meters, the selected volumetric flow is 1.57 times larger than that when it is used at sea level. However, increasing the volumetric flow means increasing the volume and the weight. Moreover, for a long and large railway line, the altitude may fluctuate during operation. If the air compressor unit with a large displacement is selected, the displacement will be too large in the low-altitude area, the working rate of the air compressor unit will be low, and the lubricating oil will be emulsified. On the contrary, if the volumetric flow is selected to be small, the air supply capacity of the vehicle running in the plateau area will be insufficient, which will affect the safety of the vehicle operation. In addition, the cooling fan of the existing air source device is generally directly connected with the compressor motor, so the cooling fan can only operate at a fixed speed to provide cooling air. With the increase of the altitude of the vehicle operation, the density of the ambient air decreases, the air mass flow driven by the cooling fan for heat exchange decreases, and the flow of the lubricating oil circulating in the air compressor is fixed, thereby causing the temperature of the lubricating oil to be too high, the air compressor to alarm and stop, and the vehicle operation to be affected.

[0005] This section is intended to provide background or context for the embodiments of the application recited in the claims. The description herein does not constitute admission that the prior art is prior art nor does it constitute admission that the prior art is relevant. SUMMARY

[0006] In view of the problems in the prior art, the application provides a variable frequency air source device for a motor train unit and a control method, which can automatically adjust the exhaust volume of the air source device, the working temperature of the lubricating oil and the switching of the double-tower dryer according to the operating environment of the vehicle.

[0007] To solve the above technical problems, the application provides the following technical solutions:

[0008] In a first aspect, the application provides a variable frequency air source device for a motor train unit, comprising: an intake filter, a frequency converter, a compressor motor, a compressor head, a cooler, a dryer, a precision filter, an electronic control unit and a temperature and pressure sensor.

[0009] The ambient air enters the compressor head through the air inlet filter, is compressed, and then sequentially passes through the cooler, the dryer and the precision filter, and enters the downstream air equipment after meeting the air quality required by the air equipment of the vehicle.

[0010] The electronic control unit controls the frequency converter to output a compressor motor speed control signal according to the temperature and pressure signal collected by the temperature and pressure sensor, so as to adjust the displacement of the compressor; and controls the cooling air volume of the cooler according to the temperature and pressure signal and a pre-generated cooling speed control signal.

[0011] Further, the cooler comprises a cooling fan motor, a cooling fan and a radiator; wherein the electronic control unit controls the speed of the cooling fan motor according to the temperature and pressure signal and the compressor motor control signal, so as to control the cooling air volume of the cooling fan.

[0012] Further, the temperature and pressure sensor comprises an atmospheric pressure sensor and a lubricating oil temperature sensor connected with the compressor head.

[0013] In a second aspect, the application provides a control method of a variable frequency air source for a motor train unit, which is applied to the variable frequency air source device for the motor train unit and comprises the following steps.

[0014] The motor speed required by the compressor motor is determined according to the rated working relative pressure of the air compressor, the current atmospheric pressure in the temperature and pressure signal, the volumetric efficiency of the air compressor and the basic speed of the compressor motor, so as to generate a compressor motor speed control signal and adjust the displacement of the compressor.

[0015] It is judged whether the air compressor needs to output a shutdown warning according to the current lubricating oil temperature in the temperature and pressure signal.

[0016] If not, the motor speed required by the cooling fan motor is determined according to the current speed of the compressor motor and the current atmospheric pressure in the temperature and pressure signal, so as to generate a cooling fan motor speed control signal and control the cooling air volume provided by the cooling fan.

[0017] Further, the determination of the motor speed required by the compressor motor according to the rated working relative pressure of the air compressor, the current atmospheric pressure in the temperature and pressure signal, the volumetric efficiency of the air compressor and the basic speed of the compressor motor, so as to generate a compressor motor speed control signal and adjust the displacement of the compressor, comprises the following steps.

[0018] It is judged whether the change amount of the current atmospheric pressure relative to the standard atmospheric pressure exceeds a threshold value.

[0019] If not, the motor speed required by the compressor motor is calculated according to the rated working relative pressure, the current atmospheric pressure in the temperature-pressure signal, the volumetric efficiency of the air compressor, the basic speed of the compressor motor, the transmission ratio of the compressor motor and the compressor main shaft, and the stroke volume of the air compressor.

[0020] The compressor motor speed control signal is generated according to the motor speed required by the compressor motor and sent to the frequency converter, and then the frequency converter outputs alternating current of a corresponding frequency to control the speed of the compressor motor to adjust the displacement of the compressor.

[0021] In a third aspect, the application provides a variable-frequency air source control system for a motor train unit, comprising:

[0022] The compressor displacement adjustment unit is configured to determine the motor speed required by the compressor motor according to the rated working relative pressure, the current atmospheric pressure in the temperature-pressure signal, the volumetric efficiency of the air compressor, and the basic speed of the compressor motor, and the electronic control unit generates a compressor motor speed control signal by calculation and adjusts the displacement of the compressor.

[0023] The shutdown warning unit is configured to determine whether to output an air compressor shutdown warning according to the current lubricating oil temperature in the temperature-pressure signal.

[0024] The cooling air volume adjustment unit is configured to, if not, determine the motor speed required by the cooling fan motor according to the current motor speed of the compressor motor and the current atmospheric pressure in the temperature-pressure signal, generate a cooling speed control signal, and control the cooling air volume provided by the cooling fan.

[0025] Further, the compressor displacement adjustment unit comprises:

[0026] The change determination module is configured to determine whether the change amount of the current atmospheric pressure relative to the standard atmospheric pressure exceeds a threshold.

[0027] The compressor motor speed calculation module is configured to, if yes, calculate the motor speed required by the compressor motor according to the rated working relative pressure, the current atmospheric pressure, the volumetric efficiency, the basic speed of the compressor motor, the transmission ratio of the compressor motor and the compressor main shaft, and the stroke volume of the air compressor.

[0028] The motor displacement adjustment module is configured to generate the compressor motor speed control signal according to the motor speed required by the compressor motor and send it to the frequency converter, and then the frequency converter outputs alternating current of a corresponding frequency to control the speed of the compressor motor to adjust the displacement of the compressor.

[0029] In a third aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the variable-frequency air source control method for a motor train unit when executing the program.

[0030] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the variable-frequency air source control method for a motor train unit.

[0031] In a fifth aspect, the present application provides a computer program product comprising computer programs / instructions, wherein the computer programs / instructions, when executed by a processor, implement the steps of the variable-frequency air source control method for a motor train unit.

[0032] To solve the problems in the prior art, the variable-frequency air source device, control method and system for a motor train unit provided by the present application can automatically adjust the exhaust capacity and cooling air volume of the air source device according to the running altitude environment of the vehicle, thereby ensuring normal air supply to the motor train unit and stable and reliable operation of the air source device, avoiding problems such as insufficient exhaust capacity, excessive exhaust capacity, large volume and weight of the air compressor unit, and over-temperature of the air compressor unit in high and low altitude fluctuation lines, improving the environmental adaptability of the motor train unit and expanding the coverage of the motor train unit. Meanwhile, the method of taking mass flow as a basic variable to control the frequency of the compressor motor, the speed control method of the cooling fan, and the control method of switching the double-tower dryer are proposed, which can ensure that the influence of altitude is fully considered in the control process, effectively provide stable and reliable compressed air for the air equipment for the vehicle, and ensure the running safety of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0034] Figure 1 FIG. 1 is a schematic diagram of the variable-frequency air source device for a motor train unit in an embodiment of the present application;

[0035] Figure 2 FIG. 4 is a flowchart of the motor speed control of the air compressor in an embodiment of the present application;

[0036] Figure 3 FIG. 5 is a flowchart of the motor speed control of the cooling fan in an embodiment of the present application;

[0037] Figure 4 FIG. 6 is a flowchart of the variable-frequency air source control method for a motor train unit in an embodiment of the present application;

[0038] Figure 5 Flow chart for adjusting the displacement of the compressor motor in the embodiment of the present application;

[0039] Figure 6 Structure diagram of the frequency conversion air source control system for the motor train unit in the embodiment of the present application;

[0040] Figure 7 Structure diagram of the compressor displacement adjustment unit in the embodiment of the present application;

[0041] Figure 8 Structure diagram of the electronic device in the embodiment of the present application.

[0042]

Symbol explanation

[0043] 1 - air inlet filter 2 - frequency converter 3 - compressor motor

[0044] 4 - compressor head 5 - safety valve 6 - cooler

[0045] 7 - dryer 8 - precision filter 9 - electronic control unit

[0046] 10 - atmospheric pressure sensor 11 - lubricating oil temperature sensor 12 - train control system

[0047] 13 - cooling fan motor 14 - cooler fan 15 - heat sink

[0048] 16 - dryer switching solenoid valve 17 - drying tower A 18 - drying tower B

[0049] 19 - back flushing orifice 20 - two-way check valve DETAILED DESCRIPTION

[0050] To make the purpose, technical scheme and advantages of the embodiment of the present application more clear and explicit, the embodiment of the present application is further described in detail below in combination with the drawings. Herein, the illustrative embodiment of the present application and its description are used to explain the present application, but not as a limitation of the present application.

[0051] The information collected in the technical scheme in the present application is information and data authorized by the user or authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of related data all comply with relevant laws, regulations and standards of relevant countries and regions, necessary security measures are taken, public order and good customs are not violated, and appropriate operation portals are provided for users to choose authorization or refusal.

[0052] The corresponding operation portal is provided for the user to choose to agree or refuse the automatic decision result; if the user chooses to refuse, the expert decision process is entered.

[0053] In an embodiment, referring to Figure 1 , in order to be able to automatically adjust the exhaust volume of the air source device and the cooling air volume and the double-tower dryer switching according to the operating environment of the vehicle, the application provides a variable frequency air source device for a motor train unit, comprising: an air inlet filter 1, a frequency converter 2, a compressor motor 3, a compressor head 4, a cooler 6, a dryer 7, a precision filter 8, an electronic control unit 9 and a temperature and pressure sensor;

[0054] Among them, the ambient air enters the compressor head 4 for compression through the air inlet filter 1, and then successively passes through the cooler 6, the dryer 7 and the precision filter 8 for processing, so as to reach the air quality required by the air equipment for vehicles, and then enters the downstream air equipment;

[0055] The electronic control unit 9 controls the frequency converter 2 to output a compressor motor speed control signal according to the pressure signal in the temperature and pressure signal collected by the temperature and pressure sensor (atmospheric pressure sensor 11) and the total air pressure signal obtained from the train control system 12, so as to adjust the speed of the compressor motor 3 and thereby adjust the exhaust volume of the compressor; and controls the speed of the cooler motor 13 according to the temperature and pressure signal (including the temperature signal and the pressure signal) and the pre-generated speed signal of the compressor motor 3, so as to control the cooling air volume of the cooler 6;

[0056] The temperature and pressure sensor comprises an atmospheric pressure sensor 10 and a lubricating oil temperature sensor 11 connected with the compressor head 4.

[0057] In an embodiment, referring to Figure 1 , the cooler 6 comprises a cooling fan motor 13, a cooler fan 14 and a radiator 15; wherein the electronic control unit 9 controls the speed of the cooling fan motor 13 according to the temperature and pressure signal and the cooling speed control signal, so as to control the cooling air volume of the cooler fan 14.

[0058] It can be understood that, in order to solve the above problems, the variable frequency air source device for a rail vehicle provided by the application, referring to Figure 1 , when the variable frequency air source device (hereinafter referred to as "air source device") starts to work, ambient air enters the compressor head 4 for air compression through the air inlet filter 1. A safety valve 5 is arranged at the compressed air outlet of the compressor head 4 for pressure protection of the compressor head 4. Due to the air compression process, the temperature of the air is increased, at this time, the compressed air with high temperature and high pressure enters the cooler 6 for cooling. When the compressed air is cooled to a temperature slightly higher than the ambient temperature, it enters the dryer 7 for drying, and finally passes through the precision filter 8 for precision filtering to reach the air quality required by the air equipment for vehicles, and then enters the downstream air equipment.

[0059] The electrical control part of the air source device mainly includes: an electronic control unit 9, a frequency converter 2, a compressor motor 3, an atmospheric pressure sensor 10, a lubricating oil temperature sensor 11 (in the compressor head), a cooling fan motor 13, and the like. The electronic control unit 9 can communicate with the train control system 12 of the vehicle, receive control instructions from the vehicle end, and report the working state and fault information of the frequency conversion air source device, and the like. The electronic control unit 9 can also receive various sensor signals on the air source device, perform calculation, and output automatic control signals to the frequency converter 2, the cooling fan motor 13, and the dryer switching electromagnetic valve 16, and the like of the air source device. The electronic control unit 9 collects the signal of the atmospheric pressure sensor 10, performs logical operation, and outputs a control instruction to the frequency converter 2. Then, the frequency converter 2 outputs an alternating current of a certain frequency according to the control instruction to adjust the speed of the compressor motor 3, so as to achieve the purpose of adjusting the displacement of the compressor.

[0060] The cooler 6 includes a cooling fan motor 13, a cooler fan 14, and a radiator 15. The cooling fan motor 13 is a variable-speed DC motor. The electronic control unit 9 collects the signal of the lubricating oil temperature sensor 11 in the compressor head 4, combines the signal with the speed control signal of the compressor motor 3, performs logical judgment, and then performs calculation according to the basic speed of the cooling fan motor 13 to output a corresponding control signal to control the speed of the cooling fan motor 13, thereby controlling the cooling air volume of the cooler fan 14. Through the above control process, under the condition that the altitude of the vehicle changes (reflected in the change of atmospheric pressure) and the displacement of the air compressor changes, the exhaust gas temperature and the lubricating oil temperature can still be kept in a stable range, thereby avoiding the thermal shock of high temperature to the air compressor set, improving the stability of the air compressor set, and prolonging the service life of the key components of the air compressor set.

[0061] The dryer 7 is realized by using a heatless regenerative adsorption type double-tower dryer. The dryer 7 includes a drying tower A 17, a drying tower B 18, a dryer switching electromagnetic valve 16, a backflushing throttle hole 19, and a bidirectional check valve 20. The electronic control unit 9 can calculate the flow of compressed air required to be dried according to the current speed of the compressor, thereby controlling the switching period of the dryer switching electromagnetic valve 16, ensuring that the compressed air can be fully dried, and ensuring that the dew point of the compressed air at the air source outlet is stable. After drying, the compressed air passes through the precision filter 8 to perform the final precision filtration of solid particles and suspended oil in the compressed air, thereby discharging the clean compressed air to the downstream air equipment. It should be noted that, in specific implementation, if the control of the compressor motor 3 and the cooler 6 can be normally completed according to the preset control process, the switching period of the dryer switching electromagnetic valve 16 does not need to be frequently changed in general, so as to frequently switch the working state of the drying tower A 17 and the drying tower B 18.

[0062] From the above description, the high-speed train set variable frequency air source device, control method and system provided by the application can automatically adjust the exhaust capacity and cooling air volume of the air source device according to the running altitude environment of the vehicle, thereby ensuring the normal air supply to the high-speed train set and the stable and reliable work of the air source device, avoiding the problems of insufficient exhaust capacity, excessive exhaust capacity, large volume and weight of the air compressor unit, and over-temperature of the air compressor unit in the high-low fluctuation line, improving the environmental adaptability of the high-speed train set, and expanding the coverage of the high-speed train set. At the same time, the method of compressor motor variable frequency control based on mass flow as the basic variable, the speed control method of the cooling fan and the control method of the double-tower dryer switching are proposed, which can ensure that the influence of altitude is fully considered in the control process, and effectively provide stable and reliable compressed air for the vehicle air equipment, and ensure the safety of the vehicle operation.

[0063] In an embodiment, referring to Figure 4 , in order to automatically adjust the exhaust capacity and cooling air volume of the air source device and the double-tower drying switching according to the running environment of the vehicle, the application provides a high-speed train set variable frequency air source control method applied to the high-speed train set variable frequency air source device, comprising:

[0064] S101: determining the required motor speed of the compressor motor under the current atmospheric pressure according to the rated working relative pressure of the air compressor, the current atmospheric pressure in the temperature and pressure signal, the volumetric efficiency of the air compressor, and the basic speed of the compressor motor, to generate a compressor motor speed control signal and adjust the displacement of the compressor.

[0065] Specifically, referring to Figure 5 , it is judged whether the change amount of the current atmospheric pressure relative to the standard atmospheric pressure exceeds a threshold value (S201); if yes, the required speed of the current compressor motor is calculated according to the rated working relative pressure, the current atmospheric pressure, the volumetric efficiency, the basic speed of the compressor motor, the transmission ratio of the compressor motor and the compressor main shaft, and the stroke volume of the air compressor (S202); the compressor motor speed control signal is generated according to the required motor speed of the current compressor motor and sent to the frequency converter, so that the frequency converter outputs alternating current of corresponding frequency to control the speed of the compressor motor, and the displacement of the compressor is adjusted (S203).

[0066] It can be understood that the start and stop of the high-speed train set air source device is controlled according to the total air pressure (relative pressure) of the vehicle. For example, for a general high-speed train set, the air source device starts to work when the total air pressure is lower than 750kPa, and the air source device stops when the total air pressure rises to 950kPa. The air storage volume configured on the same type of rail vehicle is the same. According to the state equation of perfect gas:

[0067] pV=mRT (1) p - absolute pressure;

[0068] V - volume;

[0069] m - mass;

[0070] R - gas constant;

[0071] T - thermodynamic temperature.

[0072] wherein the volume of the vehicle's air reservoir is fixed, V, and R is a constant, and ignoring the effect of temperature, then:

[0073] ΔpV = ΔmRT (2)

[0074] Δp - change in absolute pressure;

[0075] Δm - change in mass.

[0076] From equation (2) it can be seen that when the volume of the vehicle's air reservoir and the relative pressure of the air supply device when stopped are fixed, the mass of air that the air supply device based on pressure control can charge into the vehicle's air reservoir in a single start-stop is constant at different altitudes. That is, when the atmospheric pressure changes, as long as the mass flow rate output by the air supply device remains unchanged, the demand for compressed air for normal use of the vehicle can be met. Based on the above basic principle, when the rail vehicle is used at high altitudes, due to the decrease in atmospheric air density, if the speed of the compressor remains unchanged, the mass flow rate output by the volumetric compressor will decrease. Therefore, using a frequency converter to control the increase in the speed of the motor of the compressor can increase the output of the compressor, thereby increasing the mass flow rate of the compressed air output by the compressor set to be consistent with that at sea level.

[0077] Assuming that the displacement of the air supply device selected by the vehicle after the brake system air consumption calculation is the displacement of the compressor is the basic speed of the motor is n0, the transmission ratio of the motor and the main shaft of the compressor is j, and the regeneration air consumption of the double-tower dryer for regenerating compressed air is the rated cooling air volume of the cooler's cooling fan is q lv0 , and the speed of the motor of the cooler is

[0078] the volumetric displacement of the compressor q cv is:

[0079] q cv = η v · j · n0 · V s (3)

[0080] wherein η v is the volumetric efficiency of the compressor; Vs The working volume or stroke volume of the compressor.

[0081] The relationship between air density and atmospheric pressure and ambient temperature is as follows:

[0082]

[0083] Where p is the current atmospheric pressure, which refers to air pressure.

[0084] Mass flow rate of the compressor:

[0085]

[0086] q cm Indicates the mass flow rate of the compressor;

[0087] q cv Indicates the volume flow rate of the compressor;

[0088] P represents the air density of the compressor inlet.

[0089] The air mass flow rate consumed by the regeneration of the dryer is:

[0090] q dm = p q dv (6)

[0091] P represents the air density of the compressor inlet.

[0092] q dv Indicates the volume flow rate consumed by the regeneration of the dryer.

[0093] Because the set pressure of the bidirectional check valve downstream of the dryer is greater than 450 kPa, when the air source device is started, the pressure in the drying tower can reach the set pressure of the check valve in a very short time, that is, when the dryer is working, the pressure upstream of the choke is greater than (450 + p i ) kPa, and the pressure downstream of the choke is the current atmospheric pressure p i , the pressure downstream of the choke is p i / 450 + p i ≤ 0.184 < b. Where b is the critical pressure ratio of the flow through the upstream and downstream pressures, and the critical pressure ratio b of general aerodynamic components is 0.2-0.5. At this time, the choke is in choked flow state, that is, it can be considered that the flow velocity at the minimum cross-sectional area of the choke is always sonic and fixed, and thus the mass flow rate of the air consumed by the regeneration of the dryer can be calculated as:

[0094]

[0095] Where C d is the flow factor of the choke, and the flow factors of different states of the same choke are equal.

[0096] p w is the rated working relative pressure of the compressor, generally a fixed interval range;

[0097] T i is the temperature of the compressed air entering the dryer;

[0098] S is the minimum flow area of the dryer regeneration choke.

[0099] From formula (6) to formula (7), the mass flow rate of the dryer regeneration gas consumption in any area above sea level is:

[0100]

[0101] represents the volume flow rate of the dryer regeneration gas under ideal conditions (p0=1 standard atmosphere, T0=20℃);

[0102] ρ0 represents the atmospheric density under ideal conditions;

[0103] p0 represents the standard atmospheric pressure;

[0104] p w represents the rated relative working pressure of the compressor.

[0105] The mass flow rate of the compressed air output by the air source device to the vehicle is:

[0106] q m =q cm -q dm (9) q cm represents the mass flow rate provided by the compressor unit;

[0107] q dm represents the mass flow rate consumed by the dryer regeneration.

[0108] Under ideal conditions (p0=1 standard atmosphere, T0=20℃), the basic displacement q v0 of the selected air source device is calculated for the air consumption of the rail vehicle, and the basic speed of the compressor motor is n0. From formula (3) and formula (9), we can get:

[0109] q m0 =q cm0 -q dm0 =η v0 ·j·n0·V s ·ρ0-q dmo (10) q cmo represents the mass flow rate provided by the compressor unit under ideal conditions;

[0110] q dm0 q0 represents the mass flow rate consumed by the dryer regeneration under ideal conditions;

[0111] η v0 η represents the compression efficiency of the compressor set under ideal conditions;

[0112] V s V represents the working volume or stroke volume of the compressor set;

[0113] j represents the transmission ratio of the motor to the main shaft of the compressor;

[0114] ρ0 represents the air density under ideal conditions.

[0115] When the vehicle is running at any moment in high-altitude areas, the mass flow rate required by the vehicle to the air source device at this moment is:

[0116] q mi = q cmi -q dmi = η vi ·j·n i ·V s ·ρ i -q dmi (11) q cmi q represents the mass flow rate provided by the compressor set under any altitude conditions;

[0117] q dmi q0 represents the mass flow rate consumed by the dryer regeneration under any altitude conditions;

[0118] η vi η represents the compression efficiency of the compressor set under any altitude conditions;

[0119] n i n represents the rotation speed of the motor of the compressor under any altitude conditions;

[0120] ρ i ρ represents the air density under any altitude conditions.

[0121] Without considering the influence of temperature, the required motor rotation speed of the compressor motor in any altitude area can be obtained by combining equations (8) to (11):

[0122]

[0123] The volumetric efficiency of the compressor is affected by many factors, among which the most significant are the suction pressure and compression ratio of the compressor. The compression ratio ε of the compressor can be represented as:

[0124]

[0125] wherein p d is the absolute discharge pressure of the compressor;

[0126] p s is the absolute suction pressure of the compressor, for a compressor for railway vehicles it is generally the atmospheric pressure of the working environment;

[0127] p w is the rated working relative pressure of the compressor, generally a fixed small interval range.

[0128] From equation (13), it can be seen that when the air source device works at high altitude, the suction pressure decreases, while the rated working relative pressure remains unchanged, so the compression ratio increases.

[0129] Therefore, the volumetric efficiency η v can be expressed as a function related to the suction pressure of the compressor, i.e. the atmospheric pressure, i.e.:

[0130] η v = f(p s , p w ) = f(p i , p w ) (14)

[0131] In addition, the volumetric efficiency under different suction pressures can also be tested by experimental method, and then equation (11) is fitted by linear interpolation method or the recommended numerical value in the manual is adopted.

[0132] S102: Determine whether to output an air compressor shutdown warning according to the current lubricating oil temperature in the temperature and pressure signal.

[0133] S103: If not, determine the required motor speed of the cooling fan motor according to the current motor speed of the cooling fan motor and the current atmospheric pressure in the temperature and pressure signal, to generate a speed control signal of the cooling fan motor, and control the cooling air volume generated by the cooling fan according to the cooling speed control signal, so as to maintain the lubricating oil temperature in a relatively stable interval.

[0134] It can be understood that the speed control process and specific implementation of the compressor motor are shown in Figure 2 When executed, first, the basic parameters of the air compressor and the environmental state are input. When the air source device starts, the electronic control unit 9 reads the value of the total air pressure from the train control system 12, and if the total air pressure is lower than 700 kPa, it indicates that the vehicle is in the initial power-up air charging state or the vehicle is in the emergency air use state. At this time, the compressor motor operates at the maximum speed to provide the highest displacement to the vehicle for rapid air charging. When the vehicle is initially charged, the driver's initial charging waiting time can be reduced, and the efficiency can be improved. When the total air pressure is too low during vehicle operation, rapid air charging can improve the safety of the vehicle during operation.

[0135] When the vehicle is running normally, the wind source device is controlled to start and stop according to the total wind pressure value: generally, when the total wind pressure is lower than 750 kPa, the wind source device starts to charge air to the vehicle; when the total wind pressure reaches 950 kPa, the wind source device stops. When the vehicle runs to the normal start-stop area with high and low altitude, the electronic control unit reads the value of the atmospheric pressure sensor.

[0136] If the current value of the atmospheric pressure sensor is higher than 10% of the standard atmospheric pressure, the motor speed value of the air compressor is set to the calculated value of formula (12), and is used as the initial gear; otherwise, the basic speed n0 of the compressor motor is used as the initial gear. During the current start of the wind source device, the electronic control unit continuously monitors the value of the atmospheric pressure sensor. If the maximum and minimum values of the atmospheric pressure sensor deviate more than 10% of the standard atmospheric pressure after the current compressor motor speed gear is determined, or the current wind source device start time exceeds 30 minutes, the current value of the atmospheric pressure sensor is used as the basis to recalculate the motor speed according to formula (12) to determine the new gear, and then the value of the atmospheric pressure sensor is continuously refreshed, and the cycle is continued. If the above conditions are not met, it is judged whether the total wind pressure reaches the upper limit of the pressure, and whether the stop condition is met; if the total wind pressure does not reach the upper limit, the value of the atmospheric pressure sensor is continuously refreshed, and whether the next gear adjustment condition of the compressor motor is met is judged, and the cycle is continued; if the total wind pressure reaches the upper limit, the device is directly stopped.

[0137] Assuming that the rated air volume of the selected fan is Q0 and the speed is n0 when the compressor is applied in a plain area. l0 .

[0138] Formula (8) can be transformed as:

[0139]

[0140] q dmi represents the mass flow rate consumed by the dryer regeneration under any altitude condition;

[0141] represents the gas volume flow rate consumed by the dryer regeneration under ideal conditions (p0=1 standard atmospheric pressure, T0=20°C);

[0142] p0 represents the air density under ideal conditions;

[0143] p w represents the rated relative working pressure of the compressor;

[0144] p0 represents the standard atmospheric pressure;

[0145] p i represents the atmospheric pressure in any altitude area.

[0146] From the above equation, the working pressure p w = 750 kPa at 5000 m altitude, the atmospheric pressure p i = 54 kPa, the regeneration air consumption of the dryer is only affected by 5.6% of the altitude, which can be ignored. Therefore, the mass flow rate of the air compressor at different altitudes can be considered as constant. The circulation of the lubricating oil is not affected by the altitude, and the mass flow rate of the lubricating oil through the cooler is also constant.

[0147] Based on the above assumptions, according to the heat exchange formula:

[0148] Q i = cm i ΔT (16)

[0149] where Q i is the heat flow of heat exchange;

[0150] c is the specific heat capacity;

[0151] m i is the mass flow rate of the heat exchange medium;

[0152] ΔT is the temperature difference before and after the cooling medium / cooling fluid.

[0153] From equation (16), if only the altitude change is considered, the variable affected is m i , i.e. the mass flow rate of the cooling medium and the cooling medium. The mass flow rate of the compressor cooling medium (compressed air and lubricating oil) is constant, as long as the mass flow rate of the cooling fan is constant, the temperature of the compressor lubricating oil and compressed air outlet can be met.

[0154] q lm0 = q lmi (17)

[0155] In a certain speed range, it is approximately considered that the speed of the fan is proportional to the air volume, and thus:

[0156]

[0157] n l0 represents the speed of the cooling fan motor n li represents the speed of the cooling fan motor required under any altitude condition q lv0 represents the volume flow rate of the cooling air provided by the cooling fan under ideal conditions q lvi represents the volume flow rate of the cooling air provided by the cooling fan under any altitude condition q lm0 represents the mass flow rate of the cooling air provided by the cooling fan under ideal conditions q lmip0 represents the mass flow of cooling air provided by the cooling fan under any altitude condition p represents the atmospheric pressure under ideal conditions i p represents the atmospheric pressure under any altitude condition

[0158] From equations (17)-(18), we have:

[0159]

[0160] Further, the speed control process and implementation of the cooling fan motor are shown in Figure 3 After the air source device is started, the current speed of the compressor motor calculated by the electronic control unit is read.

[0161] If the current air compressor motor is running at the maximum speed, the cooling fan motor is also running at the maximum speed until it stops when the total air pressure reaches the upper limit.

[0162] If the current air compressor motor is running at the base speed, the cooling fan motor is also running at the base speed, and the value of the lubricating oil temperature sensor is monitored after a delay of 3 minutes when the lubricating oil temperature tends to be stable.

[0163] If the current air compressor motor speed does not meet the above conditions, first determine the gear i of the current compressor motor, then determine the speed of the cooling fan motor according to the result calculated by equation (19), and continuously monitor the speed of the compressor motor. If the gear changes, recalculate the speed of the cooling fan motor according to the value of equation (19). If the speed of the compressor motor does not change, monitor the value of the lubricating oil temperature sensor after a delay of 3 minutes when the lubricating oil temperature tends to be stable.

[0164] If the lubricating oil temperature rise rate is less than 2℃ / min, determine whether the lubricating oil temperature is within the normal range [T min , T max ]. Where T min is the opening temperature of the screw air compressor set temperature control valve. If the oil temperature is lower than T min , the temperature control valve does not open the lubricating oil and does not participate in the cooling cycle, and the cooler does not work. If the lubricating oil temperature is within the normal range, the cooler motor continues to run at the current speed until the air source device stops when the total air pressure reaches the upper limit. If the lubricating oil temperature is not within the normal range, it indicates that the lubricating oil temperature is too high, and the cooling fan increases the speed in a certain step, and then the lubricating oil temperature rise rate and the lubricating oil temperature range are judged in a cycle.

[0165] If the temperature rise of the lubricating oil is greater than or equal to 2℃ / min, it indicates that the temperature of the lubricating oil rises too fast at this time. At this time, it is first determined whether the temperature of the lubricating oil reaches the early warning value. If the early warning value is reached, the vehicle is warned to stop and monitor; if the early warning value is not reached, the cooling fan is increased in speed by a certain step, and then the two conditions of the lubricating oil temperature rise rate and the lubricating oil temperature interval are cycled to determine.

[0166] Further, the mass G of moisture adsorbed by the adsorption bed in the adsorption cycle of the non-thermal regenerative adsorption type double-tower dryer s is:

[0167]

[0168] wherein q v is the air volume flow rate under pressure through the drying tower;

[0169] p a is the density of the gas being treated at the inlet pressure and temperature of the dryer;

[0170] d is the difference in moisture content of the gas before and after passing through the adsorption bed;

[0171] T is the adsorption time;

[0172] is the adsorbent packing allowance.

[0173] Equation (20) can also be expressed as:

[0174]

[0175] wherein q m is the air mass flow rate through the drying tower, i.e. the exhaust mass flow rate of the air compressor. Since the principle of frequency conversion and speed regulation of the air source device is to provide the vehicle with a constant mass flow rate of compressed air (i.e. the mass flow rate after drying) at different altitudes, according to equation (15), the regeneration air quantity of the dryer at different altitudes has little effect on the exhaust quantity of the air compressor, and the mass flow rate of the air compressor exhaust can be approximately considered constant. In addition, the packing design of the adsorbent has a certain allowance, so the switching period of the dryer can be set constant, and the electronic control unit can switch according to the fixed switching period set.

[0176] From the above description, the variable frequency air source device for EMUs, the control method and system provided by the application can automatically adjust the exhaust capacity and cooling air volume of the air source device according to the running altitude environment of the vehicle, thereby ensuring the normal air supply to the EMU and the stable and reliable work of the air source device, avoiding the problems of insufficient exhaust capacity, excessive exhaust capacity, large volume and weight of the air compressor unit and over-temperature of the air compressor unit in the high and low altitude fluctuation line, improving the environmental adaptability of the EMU and expanding the coverage of the EMU. At the same time, the method of compressor motor frequency control based on mass flow as the basic variable, the speed control method of the cooling fan and the control method of the double-tower dryer switching are proposed, which can ensure that the influence of altitude is fully considered in the control process, effectively provide stable and reliable compressed air for the vehicle air equipment and ensure the running safety of the vehicle.

[0177] In an embodiment, referring to Figure 5 , the required motor speed of the compressor motor is determined according to the rated working relative pressure of the air compressor, the current atmospheric pressure in the temperature and pressure signal, the volumetric efficiency of the air compressor and the basic rotating speed of the compressor motor, to generate a compressor motor speed control signal and adjust the displacement of the compressor, including:

[0178] Based on the same inventive concept, the embodiments of the application also provide a variable frequency air source control system for EMUs, which can be used to implement the method described in the above embodiments, as described in the following embodiments. Since the principle of solving problems of the variable frequency air source control system for EMUs is similar to that of the variable frequency air source control method for EMUs, the implementation of the variable frequency air source control system for EMUs can refer to the implementation of the method of determining the software performance benchmark, and the repeated parts will not be described here. The term "unit" or "module" used below can be a combination of software and / or hardware that implements a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware or a combination of software and hardware is also possible and is conceived.

[0179] In an embodiment, referring to Figure 6 , in order to be able to automatically adjust the exhaust capacity and cooling air volume of the air source device and the switching of the double-tower dryer according to the running environment of the vehicle, the application provides a variable frequency air source control system for EMUs, which comprises: a compressor displacement adjustment unit 401, a shutdown early warning unit 402 and a cooling air volume adjustment unit 403.

[0180] The compressor displacement adjusting unit 401 is configured to determine the required motor rotating speed of the compressor motor according to the rated working relative pressure of the air compressor, the current atmospheric pressure in the temperature-pressure signal, the volumetric efficiency of the air compressor, and the basic rotating speed of the compressor motor, and the electronic control unit generates a compressor motor rotating speed control signal by calculation and adjusts the displacement of the compressor according to the compressor motor rotating speed control signal.

[0181] The shutdown early warning unit 402 is configured to determine whether to output an air compressor shutdown early warning according to the current lubricating oil temperature in the temperature-pressure signal.

[0182] The cooling air volume adjusting unit 403 is configured to, if not, determine the required motor rotating speed of the cooling fan motor according to the current rotating speed of the compressor motor and the current atmospheric pressure in the temperature-pressure signal, generate a cooling fan motor rotating speed control signal, control the cooling air volume of the cooler according to the cooling fan motor rotating speed control signal, and fine-tune the rotating speed of the cooling fan motor according to the adjusted current lubricating oil temperature.

[0183] In an embodiment, referring to Figure 7 The compressor displacement adjusting unit 401 comprises a change determining module 501, a compressor motor rotating speed calculating module 502, and a compressor displacement adjusting module 503.

[0184] The change determining module 501 is configured to determine whether the change amount of the current atmospheric pressure relative to the standard atmospheric pressure exceeds a threshold value.

[0185] The compressor motor rotating speed calculating module 502 is configured to, if yes, calculate the required motor rotating speed of the compressor motor according to the rated working relative pressure, the current atmospheric pressure, the volumetric efficiency, the basic rotating speed of the compressor motor, the transmission ratio of the compressor motor and the compressor main shaft, and the stroke volume of the air compressor.

[0186] The compressor displacement adjusting module 503 is configured to generate the compressor motor rotating speed control signal according to the required motor rotating speed of the compressor motor and send it to the frequency converter, and then the frequency converter outputs alternating current of a corresponding frequency to control the rotating speed of the compressor motor, so as to adjust the displacement of the compressor.

[0187] From the hardware aspect, in order to automatically adjust the exhaust volume and cooling and drying efficiency of the air source device according to the running environment of the vehicle, the present application provides an embodiment of an electronic device for implementing all or part of the contents of the control method of the frequency conversion air source of the motor train unit, which specifically comprises the following contents:

[0188] Processor, Memory, Communications Interface and Bus; wherein the Processor, Memory, Communications Interface complete the mutual communication through the Bus; the Communications Interface is used to realize the information transmission between the motor train unit variable frequency air source device and the core business system, user terminal and related database and other related devices; the logic controller can be a desktop computer, tablet computer and mobile terminal, etc., and the embodiment is not limited thereto. In the embodiment, the logic controller can refer to the embodiment of the motor train unit variable frequency air source control method and the embodiment of the motor train unit variable frequency air source device, the contents of which are incorporated herein, and the repeated parts will not be described again.

[0189] It can be understood that the user terminal can include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a personal digital assistant (PDA), a vehicle-mounted device, a smart wearable device, etc. The smart wearable device can include smart glasses, a smart watch, a smart bracelet, etc.

[0190] In actual application, part of the motor train unit variable frequency air source control method can be executed on the electronic device as described above, or all operations can be completed in the client device. Specifically, the selection can be made according to the processing capacity of the client device and the use scene limitation of the user, etc. The present application is not limited thereto. If all operations are completed in the client device, the client device can further include a processor.

[0191] The above-mentioned client device can have a communication module (i.e. a communication unit) and can be communicatively connected with a remote server to realize data transmission with the server. The server can include a server of the task scheduling center side, and the server of the intermediate platform can also be included in other implementation scenarios, such as the server of the third-party server platform communicatively connected with the server of the task scheduling center. The server can include a single computer device, a server cluster composed of multiple servers, or a distributed server structure.

[0192] Figure 8 A schematic block diagram of the system structure of the electronic device 9600 of the embodiment of the present application is shown in FIG. 9. As shown in FIG. 9, the electronic device 9600 can include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. It is worth noting that the structure shown in FIG. 9 is exemplary; other types of structures can also be used to supplement or replace the structure to realize telecommunication functions or other functions. Figure 8 Figure 8 The structure shown in FIG. 9 is exemplary; other types of structures can also be used to supplement or replace the structure to realize telecommunication functions or other functions.

[0193] ​In one embodiment, the variable frequency air source control method for high-speed trains can be integrated into the central processing unit 9100. The central processing unit 9100 can be configured to perform the following control:

[0194] S101: Determine the required motor speed of the compressor motor based on the rated operating relative pressure of the air compressor, the current atmospheric pressure in the temperature and pressure signal, the volumetric efficiency of the air compressor, and the base speed of the compressor motor, so as to generate a compressor motor speed control signal, and adjust the discharge volume of the compressor according to the compressor motor speed control signal;

[0195] S102: Determine whether to output an air compressor shutdown warning based on the current lubricating oil temperature in the temperature and pressure signal;

[0196] S103: If not, determine the required motor speed of the cooling fan motor based on the current motor speed of the cooling fan motor and the current atmospheric pressure in the temperature and pressure signal, so as to generate a speed control signal for the cooling fan motor, and control the cooling air volume generated by the cooling fan according to the speed control signal for the cooling fan motor, so as to maintain the lubricating oil temperature in a preset stable range.

[0197] As described above, the variable frequency air source device, control method, and system for high-speed trains provided in this application can automatically adjust the exhaust volume and cooling air volume of the air source device according to the operating altitude environment of the vehicle, thereby ensuring normal air supply to the high-speed train and its own stable and reliable operation. This avoids problems such as insufficient exhaust volume, excessive exhaust volume, large size and weight, and overheating of air compressor units that occur on lines with varying altitudes when using fixed volumetric flow rate air compressor units. This improves the environmental adaptability of the high-speed train and expands the coverage of its application. At the same time, the application proposes a method for variable frequency control of the compressor motor based on mass flow rate as a basic variable, a speed control method for the cooling fan, and a control method for switching between dual-tower dryers. This ensures that the control process fully considers the influence of altitude, effectively provides stable and reliable compressed air for the vehicle's air supply equipment, and ensures the safe operation of the vehicle.

[0198] In another embodiment, the variable frequency air source control system for high-speed trains can be configured separately from the central processing unit 9100. For example, the data composite transmission device variable frequency air source control system for high-speed trains can be configured as a chip connected to the central processing unit 9100, and the function of the variable frequency air source control method for high-speed trains can be realized through the control of the central processing unit.

[0199] like Figure 8 As shown, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is worth noting that the electronic device 9600 does not necessarily need to include these components.Figure 8 All components shown; in addition, the electronic device 9600 may also include Figure 8 For components not shown, please refer to existing technologies.

[0200] like Figure 8 As shown, the central processing unit 9100, sometimes also referred to as a controller or operating control, may include a microprocessor or other processor device and / or logic device, which receives inputs and controls the operation of various components of the electronic device 9600.

[0201] The memory 9140 may be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It may store the aforementioned failure-related information, and also store a program for executing that information. The central processing unit 9100 may execute the program stored in the memory 9140 to perform information storage or processing, etc.

[0202] Input unit 9120 provides input to central processing unit 9100. Input unit 9120 may be, for example, a keypad or touch input device. Power supply 9170 provides power to electronic device 9600. Display 9160 displays images and text. Display may be, for example, an LCD display, but is not limited thereto.

[0203] The memory 9140 can be a solid-state memory, such as a read-only memory (ROM), random access memory (RAM), a SIM card, etc. It can also be a memory that retains information even when power is off, can be selectively erased, and contains more data; examples of this type of memory are sometimes referred to as EPROMs. The memory 9140 can also be some other type of device. The memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application / function storage unit 9142 for storing application programs and function programs or processes for executing the operation of the electronic device 9600 via the central processing unit 9100.

[0204] The memory 9140 may also include a data storage unit 9143 for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit 9144 of the memory 9140 may include various drivers for the electronic device's communication functions and / or for performing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0205] The communication module 9110 is a transmitter / receiver that transmits and receives signals via the antenna 9111. The communication module (transmitter / receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, as in the case of a conventional mobile communication terminal.

[0206] Based on different communication technologies, a plurality of communication modules 9110, such as a cellular network module, a Bluetooth module, and / or a wireless local area network module, can be provided in the same electronic device. The communication module (transmitter / receiver) 9110 is also coupled to the speaker 9131 and the microphone 9132 via the audio processor 9130 to provide audio output via the speaker 9131 and receive audio input from the microphone 9132, thereby implementing a conventional telecommunication function. The audio processor 9130 can include any suitable buffer, decoder, amplifier, etc. In addition, the audio processor 9130 is coupled to the central processor 9100, thereby enabling recording on the local device via the microphone 9132 and playing stored sound on the local device via the speaker 9131.

[0207] The embodiment of the present application further provides a computer readable storage medium capable of implementing all steps of the motor train set variable frequency air source control method in the above-mentioned embodiment, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement all steps of the motor train set variable frequency air source control method in the above-mentioned embodiment, for example, the processor executes the computer program to implement the following steps:

[0208] S101: determining the required motor rotating speed of the compressor motor according to the rated working relative pressure of the air compressor, the current atmospheric pressure in the temperature and pressure signal, the volumetric efficiency of the air compressor and the basic rotating speed of the compressor motor, to generate a compressor motor rotating speed control signal, and adjusting the exhaust volume of the compressor according to the compressor motor rotating speed control signal;

[0209] S102: judging whether the air compressor shutdown early warning needs to be output according to the current lubricating oil temperature in the temperature and pressure signal;

[0210] S103: if not, determining the required motor rotating speed of the cooling fan motor according to the current motor rotating speed of the cooling fan motor and the current atmospheric pressure in the temperature and pressure signal, to generate a rotating speed control signal of the cooling fan motor, and controlling the cooling air volume generated by the cooling fan according to the rotating speed control signal of the cooling fan motor, so that the lubricating oil temperature is maintained in a preset stable interval.

[0211] From the above description, the high-speed train set variable frequency air source device, the control method and the system provided by the application can automatically adjust the exhaust capacity and the cooling air volume of the air source device according to the running altitude environment of the vehicle, so as to ensure the normal air supply of the high-speed train set and the stable and reliable work of the air source device, avoid the problems of insufficient exhaust capacity, excessive exhaust capacity, large volume weight and over-temperature of the air compressor set in the high-low fluctuation line, improve the environmental adaptability of the high-speed train set, and expand the coverage range of the high-speed train set. At the same time, the method of compressor motor variable frequency control based on mass flow as the basic variable, the speed control method of the cooling fan and the control method of the double-tower dryer switching are proposed, so as to ensure that the influence of altitude is fully considered in the control process, and stable and reliable compressed air is effectively provided for the vehicle air equipment, and the running safety of the vehicle is ensured.

[0212] Those skilled in the art will appreciate that embodiments of the application can be supplied as methods, apparatus, or computer program products. Accordingly, the application can be embodied in the form of complete hardware embodiments, complete software embodiments, or embodiments combining software and hardware aspects. Furthermore, the application can be embodied in the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage media, etc.) having computer usable program code embodied thereon.

[0213] The present application is described with reference to the flowcharts and / or block diagrams of the methods, apparatus (devices), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, as well as combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a device that implements the flow Figure 1 The device that implements the functions specified in one flow or multiple flows and / or blocks. Figure 1 The device that implements the functions specified in one flow or multiple flows and / or blocks.

[0214] These computer program instructions can also be stored in a computer-readable memory that can direct the computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including instruction devices that implement the flow Figure 1 The device that implements the functions specified in one flow or multiple flows and / or blocks. Figure 1 The device that implements the functions specified in one flow or multiple flows and / or blocks.

[0215] These computer program instructions can also be loaded into a computer or other programmable data processing devices, so that a series of operational steps are generated to realize the computer-implemented processes, and the instructions executed on the computer or other programmable devices provide a process for implementing the functions specified in the flowchart Figure 1 one flow or multiple flows and / or the functions specified in the block Figure 1 Figure 1 one flow or multiple flows and / or the functions specified in the block

[0216] The principles and implementation manners of the present application are described in the specific embodiments. The above embodiment descriptions are only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed, and the above descriptions should not be understood as limitations on the present application.

Claims

1. A variable frequency air source device for a motor train unit, characterized by, The air compressor comprises: An air inlet filter (1), a frequency converter (2), a compressor motor (3), a compressor head (4) connected with the compressor motor (3), a cooler (6), a dryer (7), a precision filter (8), an electronic control unit (9), and a temperature and pressure sensor; Wherein, the ambient air enters the compressor head (4) through the air inlet filter (1) for compression, and then sequentially passes through the cooler (6), the dryer (7) and the precision filter (8) for treatment, so as to meet the air quality required by the downstream air equipment; The electronic control unit (9) controls the frequency converter (2) to output a compressor motor speed control signal according to the temperature and pressure signal collected by the temperature and pressure sensor and the total air pressure signal obtained, so as to adjust the exhaust volume of the compressor; and controls the cooling air volume of the cooler (6) according to the temperature and pressure signal and the speed signal of the compressor motor (3) generated in advance.

2. The variable frequency air supply device for a motor train unit according to claim 1, characterized by The cooler (6) comprises a cooling fan motor (13), a cooler fan (14) and a radiator (15); wherein, the electronic control unit (9) controls the speed of the cooling fan motor (13) according to the temperature and pressure signal and the speed signal of the compressor motor (3), so as to control the cooling air volume of the cooler fan (14).

3. The variable frequency air supply device for a motor train unit according to claim 1, characterized by The temperature and pressure sensor comprises an atmospheric pressure sensor (10) and a lubricating oil temperature sensor (11) connected with the compressor head (4).

4. A variable frequency air source control method for a train set, applied to the variable frequency air source device for a train set in any one of claims 1 to 3, characterized in that, The air compressor comprises: According to the rated working relative pressure of the air compressor, the current atmospheric pressure in the temperature and pressure signal, the volumetric efficiency of the air compressor, and the basic speed of the compressor motor, the required motor speed of the compressor motor is determined to generate a compressor motor speed control signal, and the exhaust volume of the compressor is adjusted according to the compressor motor speed control signal; According to the current lubricating oil temperature in the temperature and pressure signal, it is judged whether the air compressor shutdown warning needs to be output; If not, the required motor speed of the cooling fan motor is determined according to the current motor speed of the cooling fan motor and the current atmospheric pressure in the temperature and pressure signal to generate a speed control signal of the cooling fan motor, and the cooling air volume generated by the cooling fan is controlled according to the speed control signal of the cooling fan motor, so that the lubricating oil temperature is maintained in the preset stable interval.

5. The control method of the variable frequency air source for the EMU according to claim 4, characterized in that, According to the rated working relative pressure of the air compressor, the current atmospheric pressure in the temperature and pressure signal, the volumetric efficiency of the air compressor, and the basic speed of the compressor motor, the required motor speed of the compressor motor is determined to generate a compressor motor speed control signal, and the exhaust volume of the compressor is adjusted according to the compressor motor speed control signal, comprising: It is judged whether the change amount of the current atmospheric pressure relative to the standard atmospheric pressure exceeds a threshold value; If yes, the required speed of the current compressor motor is calculated according to the rated working relative pressure, the current atmospheric pressure, the volumetric efficiency, the basic speed of the compressor motor, the transmission ratio of the compressor motor and the compressor main shaft, and the stroke volume of the air compressor. According to the motor rotating speed required by the current compressor motor, the compressor motor rotating speed control signal is generated and sent to the frequency converter, so that the frequency converter outputs alternating current of corresponding frequency to control the rotating speed of the compressor motor, and the displacement of the compressor is adjusted.

6. A variable frequency air source control system for a motor train unit, characterized by, Comprise: The compressor displacement adjustment unit is used for determining the motor rotating speed required by the compressor motor according to the rated working relative pressure of the air compressor, the current atmospheric pressure in the temperature and pressure signal, the volumetric efficiency of the air compressor and the basic rotating speed of the compressor motor, and the electronic control unit generates the compressor motor rotating speed control signal by calculation and adjusts the displacement of the compressor according to the compressor motor rotating speed control signal. The shutdown early warning unit is used for judging whether the air compressor shutdown early warning needs to be output according to the current lubricating oil temperature in the temperature and pressure signal. The cooling air volume adjustment unit is used for determining the motor rotating speed required by the cooling fan motor according to the current rotating speed of the compressor motor and the current atmospheric pressure in the temperature and pressure signal, generating the cooling fan motor rotating speed control signal, controlling the cooling air volume of the cooler according to the cooling fan motor rotating speed control signal, and fine-tuning the rotating speed of the cooling fan motor according to the adjusted current lubricating oil temperature.

7. The frequency conversion air source control system for a train set according to claim 6, characterized in that, The compressor displacement adjustment unit comprises: The change judgment module is used for judging whether the change amount of the current atmospheric pressure relative to the standard atmospheric pressure exceeds a threshold value. The compressor motor rotating speed calculation module is used for calculating the motor rotating speed required by the compressor motor according to the rated working relative pressure, the current atmospheric pressure, the volumetric efficiency, the basic rotating speed of the compressor motor, the transmission ratio of the compressor motor and the compressor main shaft and the stroke volume of the air compressor if the change amount exceeds the threshold value. The compressor displacement adjustment module is used for generating the compressor motor rotating speed control signal according to the motor rotating speed required by the compressor motor and sending it to the frequency converter, so that the frequency converter outputs alternating current of corresponding frequency to control the rotating speed of the compressor motor, and the displacement of the compressor is adjusted.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to realize the steps of the EMU variable frequency air source control method in any one of claims 4 to 5.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the EMU variable frequency air source control method in any one of claims 4 to 5.

10. A computer program product comprising computer programs / instructions, characterized in that, The computer program / instruction is executed by the processor to realize the steps of the EMU variable frequency air source control method in any one of claims 4 to 5.

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