Main air supply unit for railway vehicle, fault monitoring method and testing method

Abstract

The invention discloses a main air supply unit for a rail vehicle, a fault monitoring method and a testing method, and relates to the technical field of rail traffic, the main air supply unit comprises an air compressor, a drying device and a monitoring module, the monitoring module is used for monitoring the altitude or atmospheric pressure of the position where the rail vehicle is located in real time, and the air compressor is used for monitoring the air compressor; according to the altitude or the atmospheric pressure, a control signal is generated and sent to the drying device; the drying device comprises a first dryer and a second dryer, and the first dryer and the second dryer are used for drying compressed air generated by the air compressor and conducting back-blowing regeneration operation according to the control signal so that the current volume flow of the main air supply unit can be in positive correlation with the altitude. The two dryers are adopted as drying devices, the air volume which can be processed by one large dryer can be achieved, the monitoring module communicates with the vehicle in real time, and the volume flow of the main air supply unit after drying is adjusted according to the altitude or the atmospheric pressure of a vehicle running area.

Description

Technical Field

[0001] The present invention relates to the field of rail transportation technology, and in particular to a main air supply unit, a fault monitoring method and a testing method for a rail vehicle. Background Art

[0002] The air supply capacity and stability of the main air supply unit have a great impact on the safety of vehicle operation. Its function is to provide compressed air for the main air duct of rail transit vehicles to support the operation of rail vehicle braking system, air spring system, pantograph system and other auxiliary systems.

[0003] When rail transit vehicles operate at low altitudes, the external atmospheric pressure is low, and the volumetric flow rate of the main air supply unit required to match the vehicle's air consumption is low. When the vehicle operates at high altitudes, the mass flow rate of the main air supply unit with the same volumetric flow rate will drop significantly, failing to meet the vehicle's air consumption requirements, necessitating the use of a main air supply unit with a larger volumetric flow rate. However, when a vehicle using a high-capacity main air supply unit operates at low altitudes, the main air supply unit's volumetric flow rate is high, exceeding the vehicle's air consumption requirements, resulting in low main air supply unit operating efficiency and a high risk of lubricant emulsification.

[0004] Main air supply units with different flow rates require dryers with different air handling capacities. High-volume main air supply units require dryers with larger air handling capacities. However, to achieve the desired drying effect, dryers with larger air handling capacities typically require larger drying towers. If a rail transit vehicle lacks a dedicated machinery room for the main air supply unit and the main air supply unit must be installed in an undercarriage equipment compartment, the overall height of the main air supply unit is typically strictly limited, making it impossible to use dryers with larger drying towers.

[0005] This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. No statement herein is admitted to be prior art by virtue of its inclusion in this section. Summary of the Invention

[0006] In order to solve at least one of the technical problems existing in the main air supply unit of the rail transit vehicle mentioned in the background technology, the present invention proposes a main air supply unit, a fault monitoring method and a testing method for rail transit vehicles that can be used in areas with different altitudes.

[0007] In a first aspect, an embodiment of the present invention provides a main air supply unit for a rail vehicle, comprising: an air compressor, a drying device, and a monitoring module, wherein:

[0008] The monitoring module is used to monitor the altitude or atmospheric pressure of the location of the rail vehicle in real time, and generate a control signal to the drying device according to the altitude or atmospheric pressure;

[0009] The drying device includes a first dryer and a second dryer, the first dryer and the second dryer are used to dry the compressed air generated by the air compressor, and perform a back-blowing regeneration operation according to the control signal so that the current volume flow of the main air supply unit is positively correlated with the altitude.

[0010] In some optional aspects of this embodiment, the control signal includes a first disconnect signal, a second disconnect signal, a first close signal, and a second close signal, and the monitoring module is further configured to:

[0011] In response to monitoring that the altitude is greater than or equal to a preset altitude or the atmospheric pressure is less than a preset atmospheric pressure threshold, generating the first circuit breaker signal and the second circuit breaker signal, and transmitting the first circuit breaker signal to the first dryer and the second circuit breaker signal to the second dryer;

[0012] In response to monitoring that the altitude is less than a preset altitude or the atmospheric pressure is less than a preset atmospheric pressure threshold, generating the first closing signal and the second closing signal, and transmitting the first closing signal to the first dryer and the second closing signal to the second dryer.

[0013] In some optional aspects of this embodiment, the first dryer includes a first nozzle, a second nozzle, a first solenoid valve, a first drying tower and a second drying tower; the second dryer includes a third nozzle, a fourth nozzle, a second solenoid valve, a third drying tower and a fourth drying tower;

[0014] The first nozzle and the third nozzle are in an open state, the second nozzle is electrically connected to the first solenoid valve, and the fourth nozzle is electrically connected to the second solenoid valve. The first drying tower, the second drying tower, the third drying tower, and the fourth drying tower all include an adsorbent, and the adsorbent is used to dry the compressed air generated by the air compressor;

[0015] In response to the first solenoid valve receiving the first disconnection signal and the second solenoid valve receiving the second disconnection signal, the first solenoid valve and the second solenoid valve are disconnected; a backflush regeneration operation is performed on the adsorbent based on the first nozzle and the third nozzle, so that the current volume flow of the main air supply unit is a first volume flow;

[0016] In response to the first solenoid valve receiving the first closing signal and the second solenoid valve receiving the second closing signal, the first solenoid valve and the second solenoid valve are closed; a backflush regeneration operation is performed on the adsorbent based on the first nozzle, the second nozzle, the third nozzle, and the fourth nozzle, so that the current volume flow of the main air supply unit is a second volume flow;

[0017] Wherein, the first volume flow rate is greater than the second volume flow rate.

[0018] In some optional aspects of this embodiment, the first drying tower satisfies: when in operation, the pressure inside the first drying tower is greater than a second preset pressure threshold; when in backflush regeneration state, the pressure inside the first drying tower is less than the first preset pressure threshold;

[0019] The second drying tower satisfies: when in operation, the pressure inside the second drying tower is greater than a second preset pressure threshold; when in backflush regeneration state, the pressure inside the second drying tower is less than a first preset pressure threshold;

[0020] The third drying tower satisfies: when in operation, the pressure inside the third drying tower is greater than the second preset pressure threshold; when in backflush regeneration state, the pressure inside the third drying tower is less than the first preset pressure threshold;

[0021] The fourth drying tower satisfies: when in operation, the pressure inside the fourth drying tower is greater than a second preset pressure threshold; when in backflush regeneration state, the pressure inside the fourth drying tower is less than a first preset pressure threshold.

[0022] In some optional aspects of this embodiment, the first dryer further includes a first pressure switch electrically connected to the first drying tower and a second pressure switch electrically connected to the second drying tower; the second dryer further includes a third pressure switch electrically connected to the third drying tower and a fourth pressure switch electrically connected to the fourth drying tower; wherein:

[0023] The first pressure switch meets the following conditions: it is disconnected when the pressure in the first drying tower is lower than a first preset pressure threshold, and is connected when the pressure in the first drying tower is higher than a second preset pressure threshold;

[0024] The second pressure switch meets the following conditions: it is disconnected when the pressure in the second drying tower is lower than a first preset pressure threshold, and is connected when the pressure in the second drying tower is higher than a second preset pressure threshold;

[0025] The third pressure switch meets the following conditions: it is disconnected when the pressure in the third drying tower is lower than a first preset pressure threshold, and is connected when the pressure in the third drying tower is higher than a second preset pressure threshold;

[0026] The fourth pressure switch meets the following conditions: it is disconnected when the pressure in the fourth drying tower is lower than a first preset pressure threshold, and it is connected when the pressure in the fourth drying tower is higher than a second preset pressure threshold.

[0027] In some optional aspects of this embodiment, the first pressure switch is connected in series with the third pressure switch and is connected to the monitoring module via a first state monitoring line; the second pressure switch is connected in series with the fourth pressure switch and is connected to the monitoring module via a second state monitoring line;

[0028] The monitoring module is further configured to:

[0029] receiving a first status monitoring signal sent by the first status monitoring line and a second status monitoring signal sent by the second status monitoring line;

[0030] In response to monitoring that the first state monitoring signal and the second state monitoring signal meet at least one of preset signal failure conditions, it is determined that the drying device fails.

[0031] In some optional aspects of this embodiment, the preset signal failure condition includes a first preset signal failure sub-condition, a second preset signal failure sub-condition, a third preset signal failure sub-condition, and a fourth preset signal failure sub-condition, wherein:

[0032] The first preset signal fault sub-condition is: the time during which the first state monitoring signal and the second state monitoring signal are simultaneously low level signals is greater than a first preset time threshold;

[0033] The second preset signal fault sub-condition is: the time during which the first state monitoring signal and the second state monitoring signal or both are high level signals is greater than a first preset time threshold;

[0034] The third preset signal fault sub-condition is: the time during which the first state monitoring signal is a high level signal or a low level signal is greater than a second preset time threshold;

[0035] The fourth preset signal failure sub-condition is: the time during which the second state monitoring signal is a high level signal or a low level signal is greater than a second preset time threshold.

[0036] In some optional aspects of this embodiment, the first volumetric flow rate includes a first volumetric sub-flow rate corresponding to the first dryer and a second volumetric sub-flow rate corresponding to the second dryer; the second volumetric flow rate includes a third volumetric sub-flow rate corresponding to the first dryer and a fourth volumetric sub-flow rate corresponding to the second dryer;

[0037] The monitoring module is further configured to:

[0038] In response to monitoring that the first volume sub-flow and the second volume sub-flow satisfy at least one of first preset volume flow failure conditions, determining that the drying device is in failure;

[0039] In response to monitoring that the third volume sub-flow and the fourth volume sub-flow satisfy at least one of second preset volume flow failure conditions, determining that the drying device is in failure.

[0040] In some optional modes of the embodiment, the first preset volume flow failure conditions include first preset volume flow failure sub-conditions and second preset volume flow failure sub-conditions; and the second preset volume flow failure conditions include third preset volume flow failure sub-conditions and fourth preset volume flow failure sub-conditions, wherein:

[0041] The first preset volume flow failure sub-condition is that a maximum value of the first volume sub-flow and the second volume sub-flow is greater than a preset volume flow threshold value;

[0042] The second preset volume flow failure sub-condition is that an absolute value of a difference between the first volume sub-flow and the second volume sub-flow accounts for a proportion of a sum of the first volume sub-flow and the second volume sub-flow, and the proportion is greater than a preset proportion threshold value;

[0043] The third preset volume flow failure sub-condition is that a maximum value of the third volume sub-flow and the fourth volume sub-flow is greater than a preset volume flow threshold value;

[0044] The fourth preset volume flow failure sub-condition is that an absolute value of a difference between the third volume sub-flow and the fourth volume sub-flow accounts for a proportion of a sum of the third volume sub-flow and the fourth volume sub-flow, and the proportion is greater than a preset proportion threshold value.

[0045] In some optional modes of the embodiment, the air compressor further comprises an air filter, a first safety valve, a cooler, a hose, a second safety valve, a first overflow valve, and a first filter, wherein:

[0046] The air filter is configured to filter air entering the air compressor from the outside;

[0047] The first safety valve is configured to protect the air compressor;

[0048] The cooler is configured to cool the compressed air;

[0049] The hose is configured to prevent vibration generated when the air compressor is working from being directly transmitted to the drying device;

[0050] The second safety valve is used to protect the drying device;

[0051] The overflow valve is used to establish the pressure required for monitoring the dual-tower state switching of the first dryer or the second dryer when the total air pressure is less than a third preset pressure threshold;

[0052] The filter is used to filter foreign particles in the dried compressed air.

[0053] In a second aspect, an embodiment of the present invention further provides a method for monitoring a fault of the main air supply unit described in the first aspect, the method comprising:

[0054] receiving a first status monitoring signal sent by a first status monitoring line and a second status monitoring signal sent by a second status monitoring line;

[0055] In response to monitoring that the first state monitoring signal and the second state monitoring signal meet at least one of preset signal failure conditions, it is determined that the drying device fails.

[0056] In some optional manners of this embodiment, the preset signal failure condition includes a first preset signal failure sub-condition, a second preset signal failure sub-condition, a third preset signal failure sub-condition, and a fourth preset signal failure sub-condition, wherein:

[0057] The first preset signal fault sub-condition is: the time during which the first state monitoring signal and the second state monitoring signal are simultaneously low level signals is greater than a first preset time threshold;

[0058] The second preset signal fault sub-condition is: the time during which the first state monitoring signal and the second state monitoring signal or both are high level signals is greater than a first preset time threshold;

[0059] The third preset signal fault sub-condition is: the time during which the first state monitoring signal is a high level signal or a low level signal is greater than a second preset time threshold;

[0060] The fourth preset signal failure sub-condition is: the time during which the second state monitoring signal is a high level signal or a low level signal is greater than a second preset time threshold.

[0061] In some optional aspects of this embodiment, the altitude or atmospheric pressure of the location of the rail vehicle is monitored in real time, and a control signal is generated to the drying device according to the altitude or atmospheric pressure;

[0062] After the drying device performs a back-blowing regeneration operation according to the control signal, the current volume flow of the main air supply unit is monitored, and whether the drying device fails is determined based on the current volume flow.

[0063] In some optional aspects of this embodiment, the current volumetric flow is a first volumetric flow or a second volumetric flow, the first volumetric flow includes a first volumetric sub-flow corresponding to the first dryer and a second volumetric sub-flow corresponding to the second dryer; the second volumetric flow includes a third volumetric sub-flow corresponding to the first dryer and a fourth volumetric sub-flow corresponding to the second dryer;

[0064] Wherein, determining whether the drying device fails according to the current volume flow rate includes:

[0065] In response to monitoring that the first volume sub-flow rate and the second volume sub-flow rate satisfy at least one of a first preset volume flow rate fault condition, determining that the drying device has failed;

[0066] In response to monitoring that the third volume sub-flow rate and the fourth volume sub-flow rate satisfy at least one of a second preset volume flow rate failure condition, it is determined that the drying device fails.

[0067] In some optional aspects of this embodiment, the first preset volume flow fault condition includes a first preset volume flow fault sub-condition and a second preset volume flow fault sub-condition; the second preset volume flow fault condition includes a third preset volume flow fault sub-condition and a fourth preset volume flow fault sub-condition, wherein:

[0068] The first preset volume flow fault sub-condition is: the maximum value of the first volume sub-flow and the second volume sub-flow is greater than a preset volume flow threshold;

[0069] The second preset volume flow fault sub-condition is: a ratio of an absolute value of a difference between the first volume sub-flow and the second volume sub-flow to a sum of the first volume sub-flow and the second volume sub-flow is greater than a preset ratio threshold;

[0070] The third preset volume flow fault sub-condition is: the maximum value of the third volume sub-flow and the fourth volume sub-flow is greater than a preset volume flow threshold;

[0071] The fourth preset volume flow fault sub-condition is: a ratio of an absolute value of a difference between the third volume sub-flow and the fourth volume sub-flow to a sum of the third volume sub-flow and the fourth volume sub-flow is greater than a preset ratio threshold.

[0072] In a third aspect, an embodiment of the present invention further provides a method for testing the main air supply unit described in the first aspect, the method comprising:

[0073] performing a power-off operation on a first solenoid valve of the first dryer and a second solenoid valve of the second dryer;

[0074] Starting the main air supply unit and continuously running it for a preset time, obtaining a first test volume flow corresponding to the first dryer and a second test volume flow corresponding to the second dryer from a preset first flow meter and a preset second flow meter;

[0075] In response to determining that the first test volumetric flow rate and the second test volumetric flow rate satisfy at least one of a first preset volumetric flow rate test condition, it is determined that the drying device has failed the test.

[0076] In some optional aspects of this embodiment, the first preset volume flow test condition includes a first preset volume flow test sub-condition and a second preset volume flow test sub-condition, wherein:

[0077] The first preset volume flow test sub-condition is: the maximum value of the first test volume flow and the second test volume flow is greater than a preset test volume flow threshold;

[0078] The second preset volume flow test sub-condition is: a ratio of an absolute value of a difference between the first test volume flow and the second test volume flow to a sum of the first test volume flow and the second test volume flow is greater than a preset test ratio threshold.

[0079] In some optional aspects of this embodiment, power is supplied to the first solenoid valve of the first dryer and the second solenoid valve of the second dryer;

[0080] Starting the main air supply unit and continuously running it for a preset time, obtaining a third test volume flow corresponding to the first dryer and a fourth test volume flow corresponding to the second dryer from a preset first flow meter and a preset second flow meter;

[0081] In response to determining that the third test volumetric flow rate and the fourth test volumetric flow rate satisfy at least one of a second preset volumetric flow rate test condition, it is determined that the drying device has failed the test.

[0082] In some optional aspects of this embodiment, the second preset volume flow test condition includes a third preset volume flow test sub-condition and a fourth preset volume flow test sub-condition, wherein:

[0083] The third preset volume flow test sub-condition is: the maximum value of the third test volume flow and the fourth test volume flow is greater than a preset volume flow threshold;

[0084] The fourth preset volume flow test sub-condition is that the absolute value of the difference between the third test volume flow and the fourth test volume flow accounts for a proportion greater than a preset proportion threshold value of the sum of the third test volume flow and the fourth test volume flow.

[0085] In some optional manners of the embodiment, a power-off operation is performed on the first electromagnetic valve of the first dryer and the second electromagnetic valve of the second dryer.

[0086] Based on a preset test sequence table, the main air supply unit is sequentially subjected to start-up and shutdown operations, and after the current sequence number operation is completed, the next sequence number operation is entered immediately.

[0087] During the operation of the main air supply unit, the time when the four pressure switches of the drying device are in the on and off states is monitored and recorded in real time, and a preset fault logic table is used for judgment, and if a fault is reported, it is determined that the drying device fails to pass the test.

[0088] The main air supply unit, the fault monitoring method and the test method for the rail vehicle provided by the embodiment of the application propose a technical solution in which the main air supply unit uses two dryers as drying devices, the two smaller dryers can achieve the processable air volume of one large dryer, and the height and size of the two smaller dryers are controllable, which can meet the requirement of installing the main air supply unit in the under-vehicle equipment cabin. The monitoring module communicates with the vehicle in real time, collects the altitude data or atmospheric pressure data of the area where the vehicle is located in real time, and adjusts the monitoring method of the volume flow of the main air supply unit after drying according to the altitude or atmospheric pressure of the area where the vehicle is located. The logic is simple and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0089] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor. In the drawings:

[0090] Figure 1 It is a composition pneumatic principle diagram of the main air supply unit in the embodiment of the application.

[0091] Figure 2 It is a composition pneumatic principle diagram of the first dryer in the embodiment of the application.

[0092] Figure 3 It is a composition pneumatic principle diagram of the second dryer in the embodiment of the application.

[0093] Figure 4Schematic diagram of the connection method of four pressure switch contacts of the drying device in an embodiment of the present invention;

[0094] Figure 5 This is a flow chart of a method for monitoring a fault of a main air supply unit according to an embodiment of the present invention;

[0095] Figure 6 This is a flow chart of a method for testing a main air supply unit according to an embodiment of the present invention;

[0096] Figure 7 This is a second flow chart of a method for testing a main air supply unit according to an embodiment of the present invention;

[0097] Figure 8 This is a third flow chart of a method for testing a main air supply unit according to an embodiment of the present invention;

[0098] Figure 9 This is a pneumatic principle diagram for testing the working status of the drying device of the main air supply unit in an embodiment of the present invention. DETAILED DESCRIPTION

[0099] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0100] In a first aspect, an embodiment of the present invention provides a main air supply unit for a rail vehicle, such as Figure 1 As shown, it includes: an air compressor 2, a drying device 7 and a monitoring module 10, wherein:

[0101] The monitoring module is used to monitor the altitude or atmospheric pressure of the location of the rail vehicle in real time, and generate a control signal to the drying device according to the altitude or atmospheric pressure;

[0102] The drying device includes a first dryer 71 and a second dryer 72, which are used to dry the compressed air generated by the air compressor and perform back-blowing regeneration operations according to the control signal so that the current volume flow of the main air supply unit is positively correlated with the altitude.

[0103] In some optional aspects of this embodiment, the current volume flow of the main air supply unit is negatively correlated with the atmospheric pressure.

[0104] In some optional embodiments of this embodiment, such as Figure 1As shown, it also includes: an air filter 1, a first safety valve 3, a cooler 4, a hose 5, a second safety valve 6, a first overflow valve 8 and a first filter 9, wherein:

[0105] The air filter is used to filter the air entering the air compressor from the outside;

[0106] The first safety valve is used to protect the air compressor;

[0107] The cooler is used to cool the compressed air;

[0108] The hose is used to prevent the vibration generated by the air compressor during operation from being directly transmitted to the drying device;

[0109] The second safety valve is used to protect the drying device;

[0110] The overflow valve is used to establish the pressure required for monitoring the dual-tower state switching of the first dryer or the second dryer when the total air pressure is less than a third preset pressure threshold;

[0111] The filter is used to filter foreign particles in the dried compressed air.

[0112] Specifically, such as Figure 1 As shown, the air filter can filter the air entering the air compressor from the outside. The air compressor can be of screw type, piston type, vane type, etc., driven by an electric motor to produce compressed air. The first safety valve can protect the air compressor to prevent the air compressor from being damaged by pipeline blockage or excessive air pressure. The cooler can cool the lubricating oil and compressed air. The hose can prevent the vibration generated by the air compressor during operation from being directly transmitted to the drying device. The second safety valve can protect the drying device to prevent the drying device from being damaged by pipeline blockage or excessive air pressure. The first overflow valve can prioritize establishing the pressure required to monitor the state switching of the dryer's dual towers when the total air pressure is low. The first filter can filter dust particles and suspended oil in the compressed air after drying.

[0113] The monitoring module can control the start and stop of the main air supply unit and monitor the operating status of the main air supply unit. The monitoring module can be an independent control device or integrated into the vehicle brake control unit (BCU) or vehicle control and management system (TCMS), which is not limited in this application.

[0114] The drying device is composed of two identical dryers, both of which are identical heatless regeneration adsorption double-tower dryers, namely a first dryer 71 and a second dryer 72, which can absorb moisture in compressed air.

[0115] Furthermore, the structure of the first dryer is as follows Figure 2 Shown, including:

[0116] The first drying tower 711, the second drying tower 712, the first pressure switch 713, the second pressure switch 714, the first nozzle 715, the second nozzle 716, the first solenoid valve 717, the two-way check valve 718 of the first dryer, the third solenoid valve 719, the fifth solenoid valve 7110 and the first muffler 7111.

[0117] Furthermore, the structure of the second dryer is as follows Figure 3 Shown, including:

[0118] The third drying tower 721, the fourth drying tower 722, the third pressure switch 723, the fourth pressure switch 724, the third nozzle 725, the fourth nozzle 726, the second solenoid valve 727, the two-way check valve 728 of the second dryer, the fourth solenoid valve 729, the sixth solenoid valve 7210 and the second muffler 7211.

[0119] The monitoring module is used to monitor the altitude or atmospheric pressure of the rail vehicle in real time, and generate a control signal to the drying device according to the altitude or atmospheric pressure.

[0120] It should be noted that the first nozzle 715 of the first dryer and the first nozzle of the second dryer, namely the third nozzle 725, are in a normally open state. When only the pipelines where these two nozzles are located are connected, the air consumption for back-blowing regeneration of the dryer is relatively small, and the volume flow of the main air supply unit after drying is relatively large, which can meet the air consumption required for the vehicle when operating in high-altitude areas; the connection or disconnection of the pipelines where the second nozzle 716 of the first dryer and the second nozzle of the second dryer, namely the fourth nozzle 726, are located are respectively controlled by the first solenoid valve 717 of the first dryer and the second solenoid valve 727 of the second dryer. When the pipelines where these two nozzles are located are connected, the air consumption for back-blowing regeneration of the dryer increases, and the volume flow of the main air supply unit after drying decreases, which can match the air consumption required for the vehicle when operating in low-altitude areas.

[0121] Therefore, based on the fact that the control signal in this embodiment includes a first disconnect signal, a second disconnect signal, a first close signal, and a second close signal, the monitoring module is further configured to:

[0122] In response to monitoring that the altitude is greater than or equal to a preset altitude, determining that the rail vehicle is in a high altitude area, generating the first trip signal and the second trip signal, transmitting the first trip signal to the first dryer and transmitting the second trip signal to the second dryer;

[0123] In response to monitoring that the altitude is less than a preset altitude, it is determined that the rail vehicle is in a low-altitude area, and the first closing signal and the second closing signal are generated, and the first closing signal is transmitted to the first dryer and the second closing signal is transmitted to the second dryer.

[0124] In some optional manners of the embodiment, the monitoring module is further used for:

[0125] In response to monitoring that the atmospheric pressure is less than a preset atmospheric pressure threshold, it is determined that the rail vehicle is in a high-altitude area, and the first opening signal and the second opening signal are generated, and the first opening signal is transmitted to the first dryer and the second opening signal is transmitted to the second dryer.

[0126] In response to monitoring that the atmospheric pressure is greater than or equal to a preset pressure threshold, it is determined that the rail vehicle is in a low-altitude area, and the first closing signal and the second closing signal are generated, and the first closing signal is transmitted to the first dryer and the second closing signal is transmitted to the second dryer.

[0127] Wherein, the preset altitude and the preset atmospheric pressure threshold can be set by the person skilled in the art according to the actual situation, and the present application does not limit this.

[0128] Further, the first dryer and the second dryer are used to dry the compressed air generated by the air compressor, and according to the control signal, the backflushing regeneration operation is performed, so that the current volume flow of the main air supply unit is positively correlated with the altitude, or the current volume flow of the main air supply unit is negatively correlated with the atmospheric pressure.

[0129] Wherein, the first nozzle and the third nozzle are in an open state, the second nozzle is electrically connected with the first electromagnetic valve, the fourth nozzle is electrically connected with the second electromagnetic valve, the first drying tower, the second drying tower, the third drying tower and the fourth drying tower all include an adsorbent, and the adsorbent is used to dry the compressed air generated by the air compressor.

[0130] In response to the first electromagnetic valve receiving the first opening signal and the second electromagnetic valve receiving the second opening signal, the first electromagnetic valve and the second electromagnetic valve are opened; based on the first nozzle and the third nozzle, the adsorbent is subjected to the backflushing regeneration operation, so that the current volume flow of the main air supply unit is a first volume flow.

[0131] In response to the first electromagnetic valve receiving the first closing signal and the second electromagnetic valve receiving the second closing signal, the first electromagnetic valve and the second electromagnetic valve are closed; based on the first nozzle, the second nozzle, the third nozzle and the fourth nozzle, a blowback regeneration operation is performed on the adsorbent, so that the current volume flow of the main air supply unit is a second volume flow;

[0132] The first volume flow is greater than the second volume flow.

[0133] In some optional manners of the embodiment, the first drying tower satisfies: when in a working state, the pressure in the first drying tower is greater than a second preset pressure threshold; when in a blowback regeneration state, the pressure in the first drying tower is less than a first preset pressure threshold.

[0134] The second drying tower satisfies: when in a working state, the pressure in the second drying tower is greater than the second preset pressure threshold; when in a blowback regeneration state, the pressure in the second drying tower is less than the first preset pressure threshold.

[0135] The third drying tower satisfies: when in a working state, the pressure in the third drying tower is greater than the second preset pressure threshold; when in a blowback regeneration state, the pressure in the third drying tower is less than the first preset pressure threshold.

[0136] The fourth drying tower satisfies: when in a working state, the pressure in the fourth drying tower is greater than the second preset pressure threshold; when in a blowback regeneration state, the pressure in the fourth drying tower is less than the first preset pressure threshold.

[0137] Specifically, when the drying towers of the first dryer 71 and the second dryer 72 are in a working state, the compressed air can be dried, and the pressure in the drying tower will be higher than P2; when the drying towers of the first dryer 71 and the second dryer 72 are in a blowback regeneration state, the adsorbent will be dehydrated and dried, and the pressure in the drying tower will be lower than P1. When the main air supply unit is in a shutdown state, the pressure in the drying tower is not monitored, and the state of the drying tower is not judged.

[0138] Further, the four pressure switches (713, 714, 723 and 724) can monitor the states of the corresponding drying towers. The four pressure switches are the same, and the pressure switch contacts of the four pressure switches can be disconnected when the pressure is lower than P1 and connected when the pressure is higher than P2. The P1 is generally 250 kPa to 350 kPa, and the P2 is generally 300 kPa to 400 kPa.

[0139] In some optional aspects of this embodiment, the first dryer further includes a first pressure switch electrically connected to the first drying tower and a second pressure switch electrically connected to the second drying tower; the second dryer further includes a third pressure switch electrically connected to the third drying tower and a fourth pressure switch electrically connected to the fourth drying tower; wherein:

[0140] The first pressure switch meets the following conditions: it is disconnected when the pressure in the first drying tower is lower than a first preset pressure threshold, and is connected when the pressure in the first drying tower is higher than a second preset pressure threshold;

[0141] The second pressure switch meets the following conditions: it is disconnected when the pressure in the second drying tower is lower than a first preset pressure threshold, and is connected when the pressure in the second drying tower is higher than a second preset pressure threshold;

[0142] The third pressure switch meets the following conditions: it is disconnected when the pressure in the third drying tower is lower than a first preset pressure threshold, and is connected when the pressure in the third drying tower is higher than a second preset pressure threshold;

[0143] The fourth pressure switch meets the following conditions: it is disconnected when the pressure in the fourth drying tower is lower than a first preset pressure threshold, and it is connected when the pressure in the fourth drying tower is higher than a second preset pressure threshold.

[0144] Specifically, such as Figure 4 As shown, the contacts of the first pressure switch 713 of the first dryer and the contacts of the first pressure switch, i.e., the third pressure switch 723, of the second dryer are connected in series. When the first drying tower 711 of the first dryer and the first drying tower, i.e., the third drying tower 721 of the second dryer are both in working state, the dryer state monitoring signal A circuit will output a high-level signal to the monitoring module; when any of the first drying tower 711 of the first dryer and the first drying tower, i.e., the third drying tower 721 of the second dryer is in non-working state, the dryer state monitoring signal A circuit will output a low-level signal to the monitoring module.

[0145] The contacts of the second pressure switch 714 of the first dryer are connected in series with the contacts of the second pressure switch, or fourth pressure switch 724, of the second dryer. When both the second drying tower 712 of the first dryer and the second drying tower 722 of the second dryer are in operation, the dryer status monitoring signal circuit B outputs a high-level signal to the monitoring module. When either the second drying tower 712 of the first dryer or the second drying tower 722 of the second dryer is in non-operational status, the dryer status monitoring signal circuit B outputs a low-level signal to the monitoring module.

[0146] In some optional aspects of this embodiment, the first pressure switch is connected in series with the third pressure switch and is connected to the monitoring module via a first state monitoring line; the second pressure switch is connected in series with the fourth pressure switch and is connected to the monitoring module via a second state monitoring line;

[0147] The monitoring module is further configured to:

[0148] receiving a first status monitoring signal sent by the first status monitoring line and a second status monitoring signal sent by the second status monitoring line;

[0149] In response to monitoring that the first state monitoring signal and the second state monitoring signal meet at least one of preset signal failure conditions, it is determined that the drying device fails.

[0150] In some optional aspects of this embodiment, the preset signal failure condition includes a first preset signal failure sub-condition, a second preset signal failure sub-condition, a third preset signal failure sub-condition, and a fourth preset signal failure sub-condition, wherein:

[0151] The first preset signal fault sub-condition is: the time during which the first state monitoring signal and the second state monitoring signal are simultaneously low level signals is greater than a first preset time threshold;

[0152] The second preset signal fault sub-condition is: the time during which the first state monitoring signal and the second state monitoring signal or both are high level signals is greater than a first preset time threshold;

[0153] The third preset signal fault sub-condition is: the time during which the first state monitoring signal is a high level signal or a low level signal is greater than a second preset time threshold;

[0154] The fourth preset signal failure sub-condition is: the time during which the second state monitoring signal is a high level signal or a low level signal is greater than a second preset time threshold.

[0155] In some optional aspects of this embodiment, the first volumetric flow rate includes a first volumetric sub-flow rate corresponding to the first dryer and a second volumetric sub-flow rate corresponding to the second dryer; the second volumetric flow rate includes a third volumetric sub-flow rate corresponding to the first dryer and a fourth volumetric sub-flow rate corresponding to the second dryer;

[0156] The monitoring module is further configured to:

[0157] In response to monitoring that the first volume sub-flow rate and the second volume sub-flow rate satisfy at least one of a first preset volume flow rate fault condition, determining that the drying device has failed;

[0158] In response to monitoring that the third volume sub-flow and the fourth volume sub-flow satisfy at least one of second preset volume flow fault conditions, it is determined that the drying device is faulty.

[0159] In some optional manners of the embodiment, the first preset volume flow fault conditions include a first preset volume flow fault sub-condition and a second preset volume flow fault sub-condition; and the second preset volume flow fault conditions include a third preset volume flow fault sub-condition and a fourth preset volume flow fault sub-condition, wherein:

[0160] The first preset volume flow fault sub-condition is that a maximum value of the first volume sub-flow and the second volume sub-flow is greater than a preset volume flow threshold value;

[0161] The second preset volume flow fault sub-condition is that an absolute value of a difference between the first volume sub-flow and the second volume sub-flow accounts for a proportion of a sum of the first volume sub-flow and the second volume sub-flow, and the proportion is greater than a preset proportion threshold value;

[0162] The third preset volume flow fault sub-condition is that a maximum value of the third volume sub-flow and the fourth volume sub-flow is greater than a preset volume flow threshold value;

[0163] The fourth preset volume flow fault sub-condition is that an absolute value of a difference between the third volume sub-flow and the fourth volume sub-flow accounts for a proportion of a sum of the third volume sub-flow and the fourth volume sub-flow, and the proportion is greater than a preset proportion threshold value.

[0164] The drying device of the main air supply unit adopts two dryers. If the compressed air flow through the two dryers is too different when the main air supply unit is running, the service life of the adsorbents of the two dryers may be greatly different, and the adsorbent replacement period cannot be unified. In addition, if the working regeneration switching periods of the two dryers are not synchronized when the main air supply unit is running, and the difference between the switching periods exceeds the design threshold value, the drying device may be reported as faulty. Therefore, it is necessary to test the working state of the drying device when the main air supply unit is running, especially the compressed air flow through the two dryers and the synchronization of the working regeneration switching periods of the two dryers.

[0165] In a second aspect, as Figure 5 The embodiment of the present application also provides a fault monitoring method for the main air supply unit of the first aspect, which comprises:

[0166] S1, receiving a first state monitoring signal sent by a first state monitoring line and a second state monitoring signal sent by a second state monitoring line;

[0167] S2, in response to monitoring that the first state monitoring signal and the second state monitoring signal satisfy at least one of the preset signal fault conditions, determining that the drying device is malfunctioning.

[0168] In some optional manners of the embodiment, the preset signal fault conditions include a first preset signal fault sub-condition, a second preset signal fault sub-condition, a third preset signal fault sub-condition, and a fourth preset signal fault sub-condition, wherein:

[0169] The first preset signal fault sub-condition is that the first state monitoring signal and the second state monitoring signal are low-level signals at the same time for more than a first preset time threshold;

[0170] The second preset signal fault sub-condition is that the first state monitoring signal and the second state monitoring signal are high-level signals at the same time for more than a first preset time threshold;

[0171] The third preset signal fault sub-condition is that the first state monitoring signal is a high-level signal or a low-level signal for more than a second preset time threshold;

[0172] The fourth preset signal fault sub-condition is that the second state monitoring signal is a high-level signal or a low-level signal for more than a second preset time threshold.

[0173] In some optional manners of the embodiment, as shown in Figure 5 The method further includes:

[0174] S3, monitoring the altitude or atmospheric pressure of the location where the rail vehicle is located in real time, and generating a control signal to the drying device according to the altitude or atmospheric pressure;

[0175] S4, after the drying device performs the blowback regeneration operation according to the control signal, monitoring the current volume flow of the main air supply unit, and determining whether the drying device is malfunctioning according to the current volume flow.

[0176] In some optional manners of the embodiment, the current volume flow is a first volume flow or a second volume flow, the first volume flow includes a first volume sub-flow corresponding to the first dryer and a second volume sub-flow corresponding to the second dryer, and the second volume flow includes a third volume sub-flow corresponding to the first dryer and a fourth volume sub-flow corresponding to the second dryer;

[0177] The determining whether the drying device is malfunctioning according to the current volume flow includes:

[0178] In response to monitoring that the first volume sub-flow rate and the second volume sub-flow rate satisfy at least one of a first preset volume flow rate fault condition, determining that the drying device has failed;

[0179] In response to monitoring that the third volume sub-flow rate and the fourth volume sub-flow rate satisfy at least one of a second preset volume flow rate failure condition, it is determined that the drying device fails.

[0180] In some optional aspects of this embodiment, the first preset volume flow fault condition includes a first preset volume flow fault sub-condition and a second preset volume flow fault sub-condition; the second preset volume flow fault condition includes a third preset volume flow fault sub-condition and a fourth preset volume flow fault sub-condition, wherein:

[0181] The first preset volume flow fault sub-condition is: the maximum value of the first volume sub-flow and the second volume sub-flow is greater than a preset volume flow threshold;

[0182] The second preset volume flow fault sub-condition is: a ratio of an absolute value of a difference between the first volume sub-flow and the second volume sub-flow to a sum of the first volume sub-flow and the second volume sub-flow is greater than a preset ratio threshold;

[0183] The third preset volume flow fault sub-condition is: the maximum value of the third volume sub-flow and the fourth volume sub-flow is greater than a preset volume flow threshold;

[0184] The fourth preset volume flow fault sub-condition is: a ratio of an absolute value of a difference between the third volume sub-flow and the fourth volume sub-flow to a sum of the third volume sub-flow and the fourth volume sub-flow is greater than a preset ratio threshold.

[0185] Specifically, the monitoring method of the present invention is as follows:

[0186] C1. When the main air supply unit is running, the monitoring module monitors the dryer status monitoring signal A and the dryer status monitoring signal B in real time. If any of the following situations occurs, it is determined that the drying device is faulty:

[0187] (1) After the main air supply unit is started, the two signals are simultaneously high or low for more than 30 seconds;

[0188] (2) The continuous duration of the dryer status monitoring signal A or the dryer status monitoring signal B being high or low exceeds 180 seconds.

[0189] C2. When the main air supply unit is running, the monitoring module communicates with the vehicle in real time, collects altitude data or atmospheric pressure data of the area where the vehicle is located in real time, and performs the following judgments and operations:

[0190] When the altitude of the vehicle is greater than or equal to h, the atmospheric pressure is low (i.e., the atmospheric pressure is less than the preset atmospheric pressure threshold), and the volume flow of the main air supply unit that matches the air consumption of the vehicle's braking system, air spring system, bow lifting system, etc. is large. The first solenoid valve 717 of the first dryer and the second solenoid valve 727 of the second dryer are in the disconnected state, and the adsorbent is only back-blown and regenerated through the first nozzle 715 of the first dryer and the first nozzle of the second dryer, i.e., the third nozzle 725. The regeneration gas consumption is low, which can ensure a larger volume flow of the main air supply unit after drying.

[0191] When the vehicle's altitude is lower than h, the atmospheric pressure is high (i.e., the atmospheric pressure is greater than or equal to the preset atmospheric pressure threshold), and the volumetric flow of the main air supply unit, which matches the air consumption of the vehicle's braking system, air spring system, and bow lifting system, decreases. The monitoring module controls the first solenoid valve 717 of the first dryer and the second solenoid valve 727 of the second dryer to enter the on state. Adsorbent backflushing regeneration can be performed through the first nozzle 715 of the first dryer, the second nozzle 716 of the first dryer, the first nozzle of the second dryer, i.e., the third nozzle 725, and the second nozzle of the second dryer, i.e., the fourth nozzle 726. This increases the regeneration gas consumption and reduces the volumetric flow of the main air supply unit after drying. Under the same vehicle gas consumption, the operating rate of the main air supply unit can be effectively improved, reducing the risk of lubricating oil emulsification.

[0192] Thirdly, as Figure 6 As shown, an embodiment of the present invention further provides a method for testing the main air supply unit described in the first aspect, the method comprising:

[0193] A1. De-energize the first solenoid valve of the first dryer and the second solenoid valve of the second dryer;

[0194] A2. Start the main air supply unit and run it continuously for a preset time, and obtain a first test volume flow corresponding to the first dryer and a second test volume flow corresponding to the second dryer from a preset first flow meter and a preset second flow meter;

[0195] A3. In response to determining that the first test volumetric flow rate and the second test volumetric flow rate satisfy at least one of a first preset volumetric flow rate test condition, determine that the drying device fails the test.

[0196] In some optional aspects of this embodiment, the first preset volume flow test condition includes a first preset volume flow test sub-condition and a second preset volume flow test sub-condition, wherein:

[0197] The first preset volume flow test sub-condition is: the maximum value of the first test volume flow and the second test volume flow is greater than a preset test volume flow threshold;

[0198] The second preset volume flow test sub-condition is: a ratio of an absolute value of a difference between the first test volume flow and the second test volume flow to a sum of the first test volume flow and the second test volume flow is greater than a preset test ratio threshold.

[0199] In some optional embodiments of this embodiment, such as Figure 7 As shown, it also includes:

[0200] A4. Powering the first solenoid valve of the first dryer and the second solenoid valve of the second dryer;

[0201] A5. Start the main air supply unit and run it continuously for a preset time, and obtain a third test volume flow corresponding to the first dryer and a fourth test volume flow corresponding to the second dryer from a preset first flow meter and a preset second flow meter;

[0202] A6. In response to determining that the third test volumetric flow rate and the fourth test volumetric flow rate satisfy at least one of a second preset volumetric flow rate test condition, determine that the drying device fails the test.

[0203] In some optional aspects of this embodiment, the second preset volume flow test condition includes a third preset volume flow test sub-condition and a fourth preset volume flow test sub-condition, wherein:

[0204] The third preset volume flow test sub-condition is: the maximum value of the third test volume flow and the fourth test volume flow is greater than a preset volume flow threshold;

[0205] The fourth preset volume flow test sub-condition is: a ratio of an absolute value of a difference between the third test volume flow and the fourth test volume flow to a sum of the third test volume flow and the fourth test volume flow is greater than a preset ratio threshold.

[0206] In some optional embodiments of this embodiment, such as Figure 8 As shown, it also includes:

[0207] A7. De-energize the first solenoid valve of the first dryer and the second solenoid valve of the second dryer;

[0208] A8. Start and stop the main air supply unit in sequence based on the preset test sequence table, and immediately proceed to the next sequence operation after the current sequence operation is completed;

[0209] A9. During the operation of the main air supply unit, the time when the four pressure switches of the drying device are in the on and off states is monitored and recorded in real time, and a judgment is made according to the preset fault logic table. If a fault is reported, it is determined that the drying device has failed the test.

[0210] In a specific example, the working state test scheme of the drying device of the present invention is as follows, wherein the pneumatic principle of the test scheme is as follows: Figure 9 As shown:

[0211] Figure 9 In the figure, the air filter 1, the air compressor 2, the first safety valve 3, the cooler 4, the hose 5, the second safety valve 6, the first dryer 71, the second dryer 72, the first overflow valve 8, and the precision filter 9 are the same as the components with corresponding codes in the main air supply unit described above.

[0212] Air cylinder 11 and air cylinder 15 are the same air cylinders with a volume ≥50L; flow meter 12 and flow meter 16 are the same compressed air flow meter; the second overflow valve 13 and the first overflow valve 8 are the same overflow valve; the precision filter 14 and the precision filter 9 are the same precision filters.

[0213] The test scheme steps are as follows:

[0214] D1. Power is turned off to the first solenoid valve 717 in the first dryer 71 and the second solenoid valve 727 in the second dryer 72. Both are in the disconnected state. Adsorbent backflushing and regeneration are now performed only through the first nozzle 715 of the first dryer and the first and third nozzles 725 of the second dryer. The main air supply unit has a high volumetric flow rate after drying. After starting the main air supply unit and operating it continuously for 10 minutes, record the volumetric flow rates Q1 and Q2 displayed by flowmeters 12 and 16, respectively. Q1 and Q2 must simultaneously meet the following two conditions:

[0215] (1) max{Q1, Q2} ≤ Q0 × (1-η), where Q0 and η are the maximum air volume and minimum backflush regeneration air consumption rate of the dryer under the premise of ensuring the drying effect and the specified desiccant life.

[0216] (2) |Q1-Q2| / (Q1+Q2)≤10%.

[0217] If Q1 and Q2 cannot meet the above two conditions at the same time, the cause of the problem should be checked and corrected.

[0218] D2. Power is supplied to the first solenoid valve 717 of the first dryer 71 and the second solenoid valve 727 of the second dryer 72, both of which are in the on state. Adsorbent backflushing and regeneration will now proceed through the first nozzle 715 of the first dryer, the second nozzle 716 of the first dryer, the first nozzle (third nozzle 725) of the second dryer, and the second nozzle (fourth nozzle 726) of the second dryer. The volumetric flow rate of the main air supply unit will significantly decrease after drying. After starting the main air supply unit and operating it continuously for 10 minutes, record the volumetric flow rates Q3 and Q4 displayed by flowmeters 12 and 16, respectively. Q3 and Q4 must simultaneously meet the following two conditions:

[0219] (1) max{Q3, Q4}≤Q0×(1-η), where Q0 and η are the maximum air volume and minimum backflush regeneration air consumption rate of the dryer under the premise of ensuring the drying effect and the specified desiccant life.

[0220] (2) |Q3-Q4| / (Q3+Q4)≤10%.

[0221] If Q3 and Q4 cannot meet the above two conditions at the same time, the cause of the problem should be checked and corrected.

[0222] D3. Power is not supplied to the first solenoid valve 717 of the first dryer 71 and the second solenoid valve 727 of the second dryer 72; both are in the off state. Start and stop the main air supply unit in the order shown in Table 1 below. After the current operation is completed, immediately proceed to the next operation.

[0223] During the operation of the main air supply unit, the time when the four pressure switches of the drying device are in the on and off states should be monitored and recorded in real time, and the fault logic in Table 2 below should be used for judgment. If a fault is reported, the cause of the problem should be checked and corrected.

[0224] Table 1

[0225]

[0226] The present invention proposes a technical solution in which the main air supply unit adopts two dryers as drying devices. The two smaller dryers can achieve the air volume that can be processed by one large dryer, and the height dimensions of the two smaller dryers are controllable, which can meet the requirement of installing the main air supply unit in the equipment compartment under the vehicle.

[0227] The two dryers in the main air supply unit drying device described in the present invention are identical and each is equipped with two backflush regeneration nozzles. When the vehicle is operating at high altitudes, the required main air supply unit volumetric flow rate is relatively high. Only the first nozzles of the two dryers are used for adsorbent backflush regeneration, reducing backflush regeneration gas consumption and ensuring a relatively high post-drying volumetric flow rate of the main air supply unit. When the vehicle is operating at low altitudes, the required main air supply unit volumetric flow rate is relatively low. All four nozzles of the two dryers are used for adsorbent backflush regeneration, increasing backflush regeneration gas consumption and reducing the post-drying volumetric flow rate of the main air supply unit. This can effectively improve the operating efficiency of the main air supply unit and reduce the risk of lubricating oil emulsification.

[0228] Table 2

[0229]

[0230] This application proposes a monitoring method that communicates with the vehicle in real time through the monitoring module, collects the altitude data or atmospheric pressure data of the vehicle's area in real time, and adjusts the volume flow rate of the main air supply unit after drying according to the altitude or atmospheric pressure of the vehicle's operating area. The logic is simple and reliable.

[0231] Under normal circumstances, using one dryer requires two dryer status signals to be output to the monitoring module; using two dryers requires four dryer status signals to be output to the monitoring module before the monitoring module can determine whether the dryers are functioning properly. This application proposes a technical solution that connects the first drying tower pressure switch contacts of the two dryers in series, and the second drying tower pressure switch contacts of the two dryers in series, and then outputs two signals to the monitoring module. The monitoring module reserves only two signal input ports, making it compatible with both the one-dryer and two-dryer solutions.

[0232] The present invention proposes a test scheme for testing the compressed air flow rate through two dryers. Based on this test scheme, it can be confirmed that when the main air supply unit is in two states: a larger volumetric flow rate after drying and a smaller volumetric flow rate after drying, the compressed air flow rate through the two dryers is within a reasonable range, and there will be no problem of a large difference between the two or the compressed air flow rate through any dryer exceeding the air volume that the dryer can handle.

[0233] The present invention proposes a test scheme for testing whether the working regeneration state switching of the two dryers of the main air supply unit is normal. Based on this test scheme, the adverse effects of the main air supply unit's different operating times and different downtime conditions on the working regeneration state switching of the two dryers can be confirmed and eliminated.

[0234] It can be understood that the above examples are merely examples listed for a better understanding of the technical solutions of the embodiments of the present invention, and are not intended to be the sole limitation on the embodiments of the present invention.

[0235] It should be noted that, in the description of this application, the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0236] It should also be noted that, in the description of the present application, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0237] In the embodiments of this application, the singular forms "a," "the," etc. include plural forms and should be broadly understood to mean "a" or "a type" rather than being limited to "one." Furthermore, the term "said" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. Furthermore, the term "according to" should be understood to mean "at least in part based on...", and the term "based on" should be understood to mean "at least in part based on...", unless the context clearly indicates otherwise.

[0238] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this disclosure can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions of this disclosure can be achieved. This is not a limitation herein.

[0239] The above specific embodiments do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure shall be included within the scope of protection of this disclosure.

[0240] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A main air supply unit for a rail vehicle, characterized in that: include: Air compressor, drying unit and monitoring module, including: The monitoring module is used to monitor the altitude or atmospheric pressure of the location of the rail vehicle in real time, and generate a control signal to the drying device according to the altitude or the atmospheric pressure; The drying device includes a first dryer and a second dryer, the first dryer and the second dryer are used to dry the compressed air generated by the air compressor, and perform a back-blowing regeneration operation according to the control signal so that the current volume flow of the main air supply unit is positively correlated with the altitude.

2. The main air supply unit according to claim 1, characterized in that: The control signal includes a first disconnect signal, a second disconnect signal, a first close signal, and a second close signal, and the monitoring module is further configured to: In response to monitoring that the altitude is greater than or equal to a preset altitude or the atmospheric pressure is less than a preset atmospheric pressure threshold, generating the first circuit breaker signal and the second circuit breaker signal, and transmitting the first circuit breaker signal to the first dryer and the second circuit breaker signal to the second dryer; In response to monitoring that the altitude is less than a preset altitude or the atmospheric pressure is greater than or equal to a preset atmospheric pressure threshold, the first closing signal and the second closing signal are generated, and the first closing signal is transmitted to the first dryer and the second closing signal is transmitted to the second dryer.

3. The main air supply unit according to claim 2, characterized in that: The first dryer includes a first nozzle, a second nozzle, a first solenoid valve, a first drying tower and a second drying tower; the second dryer includes a third nozzle, a fourth nozzle, a second solenoid valve, a third drying tower and a fourth drying tower; The first nozzle and the third nozzle are in an open state, the second nozzle is electrically connected to the first solenoid valve, and the fourth nozzle is electrically connected to the second solenoid valve. The first drying tower, the second drying tower, the third drying tower, and the fourth drying tower all include an adsorbent, and the adsorbent is used to dry the compressed air generated by the air compressor; In response to the first solenoid valve receiving the first disconnection signal and the second solenoid valve receiving the second disconnection signal, the first solenoid valve and the second solenoid valve are disconnected; a backflush regeneration operation is performed on the adsorbent based on the first nozzle and the third nozzle, so that the current volume flow of the main air supply unit is a first volume flow; In response to the first solenoid valve receiving the first closing signal and the second solenoid valve receiving the second closing signal, the first solenoid valve and the second solenoid valve are closed; a backflush regeneration operation is performed on the adsorbent based on the first nozzle, the second nozzle, the third nozzle, and the fourth nozzle, so that the current volume flow of the main air supply unit is a second volume flow; Wherein, the first volume flow rate is greater than the second volume flow rate.

4. The main air supply unit according to claim 3, characterized in that: The first drying tower satisfies: when in operation, the pressure inside the first drying tower is greater than a second preset pressure threshold; when in backflush regeneration state, the pressure inside the first drying tower is less than the first preset pressure threshold; The second drying tower satisfies: when in operation, the pressure inside the second drying tower is greater than a second preset pressure threshold; when in backflush regeneration state, the pressure inside the second drying tower is less than a first preset pressure threshold; The third drying tower satisfies: when in operation, the pressure inside the third drying tower is greater than the second preset pressure threshold; when in backflush regeneration state, the pressure inside the third drying tower is less than the first preset pressure threshold; The fourth drying tower satisfies: when in operation, the pressure inside the fourth drying tower is greater than a second preset pressure threshold; when in backflush regeneration state, the pressure inside the fourth drying tower is less than a first preset pressure threshold.

5. The main air supply unit according to claim 4, characterized in that: The first dryer further includes a first pressure switch electrically connected to the first drying tower and a second pressure switch electrically connected to the second drying tower; the second dryer further includes a third pressure switch electrically connected to the third drying tower and a fourth pressure switch electrically connected to the fourth drying tower; wherein: The first pressure switch meets the following conditions: it is disconnected when the pressure in the first drying tower is lower than a first preset pressure threshold, and is connected when the pressure in the first drying tower is higher than a second preset pressure threshold; The second pressure switch meets the following conditions: it is disconnected when the pressure in the second drying tower is lower than a first preset pressure threshold, and is connected when the pressure in the second drying tower is higher than a second preset pressure threshold; The third pressure switch meets the following conditions: it is disconnected when the pressure in the third drying tower is lower than a first preset pressure threshold, and is connected when the pressure in the third drying tower is higher than a second preset pressure threshold; The fourth pressure switch meets the following conditions: it is disconnected when the pressure in the fourth drying tower is lower than a first preset pressure threshold, and it is connected when the pressure in the fourth drying tower is higher than a second preset pressure threshold.

6. The main air supply unit according to claim 5, characterized in that: The first pressure switch is connected in series with the third pressure switch and is connected to the monitoring module via a first state monitoring line; the second pressure switch is connected in series with the fourth pressure switch and is connected to the monitoring module via a second state monitoring line; The monitoring module is further configured to: receiving a first status monitoring signal sent by the first status monitoring line and a second status monitoring signal sent by the second status monitoring line; In response to monitoring that the first state monitoring signal and the second state monitoring signal meet at least one of preset signal failure conditions, it is determined that the drying device fails.

7. The main air supply unit according to claim 6, characterized in that: The preset signal failure condition includes a first preset signal failure sub-condition, a second preset signal failure sub-condition, a third preset signal failure sub-condition, and a fourth preset signal failure sub-condition, wherein: The first preset signal fault sub-condition is: the time during which the first state monitoring signal and the second state monitoring signal are simultaneously low level signals is greater than a first preset time threshold; The second preset signal fault sub-condition is: the time during which the first state monitoring signal and the second state monitoring signal or both are high level signals is greater than a first preset time threshold; The third preset signal fault sub-condition is: the time during which the first state monitoring signal is a high level signal or a low level signal is greater than a second preset time threshold; The fourth preset signal failure sub-condition is: the time during which the second state monitoring signal is a high level signal or a low level signal is greater than a second preset time threshold.

8. The main air supply unit according to claim 3, characterized in that: The first volume flow includes a first volume sub-flow corresponding to the first dryer and a second volume sub-flow corresponding to the second dryer; the second volume flow includes a third volume sub-flow corresponding to the first dryer and a fourth volume sub-flow corresponding to the second dryer; The monitoring module is further configured to: In response to monitoring that the first volume sub-flow rate and the second volume sub-flow rate satisfy at least one of a first preset volume flow rate fault condition, determining that the drying device has failed; In response to monitoring that the third volume sub-flow rate and the fourth volume sub-flow rate satisfy at least one of a second preset volume flow rate failure condition, it is determined that the drying device fails.

9. The main air supply unit according to claim 8, characterized in that: The first preset volume flow fault condition includes a first preset volume flow fault sub-condition and a second preset volume flow fault sub-condition; The second preset volume flow fault condition includes a third preset volume flow fault sub-condition and a fourth preset volume flow fault sub-condition, wherein: The first preset volume flow fault sub-condition is: the maximum value of the first volume sub-flow and the second volume sub-flow is greater than a preset volume flow threshold; The second preset volume flow fault sub-condition is: a ratio of an absolute value of a difference between the first volume sub-flow and the second volume sub-flow to a sum of the first volume sub-flow and the second volume sub-flow is greater than a preset ratio threshold; The third preset volume flow fault sub-condition is: the maximum value of the third volume sub-flow and the fourth volume sub-flow is greater than a preset volume flow threshold; The fourth preset volume flow fault sub-condition is: a ratio of an absolute value of a difference between the third volume sub-flow and the fourth volume sub-flow to a sum of the third volume sub-flow and the fourth volume sub-flow is greater than a preset ratio threshold.

10. The main air supply unit according to claim 1, characterized in that: Also includes: Air filter, first safety valve, cooler, hose, second safety valve, first overflow valve and first filter, including: The air filter is used to filter the air entering the air compressor from the outside; The first safety valve is used to protect the air compressor; The cooler is used to cool the compressed air; The hose is used to prevent the vibration generated by the air compressor during operation from being directly transmitted to the drying device; The second safety valve is used to protect the drying device; The overflow valve is used to establish the pressure required for monitoring the dual-tower state switching of the first dryer or the second dryer when the total air pressure is less than a third preset pressure threshold; The filter is used to filter foreign particles in the dried compressed air.

11. A method for monitoring a fault of a main air supply unit according to any one of claims 1 to 10, characterized in that: include: receiving a first status monitoring signal sent by a first status monitoring line and a second status monitoring signal sent by a second status monitoring line; In response to monitoring that the first state monitoring signal and the second state monitoring signal meet at least one of preset signal failure conditions, it is determined that the drying device fails.

12. The fault monitoring method according to claim 11, characterized in that: The preset signal failure condition includes a first preset signal failure sub-condition, a second preset signal failure sub-condition, a third preset signal failure sub-condition, and a fourth preset signal failure sub-condition, wherein: The first preset signal fault sub-condition is: the time during which the first state monitoring signal and the second state monitoring signal are simultaneously low level signals is greater than a first preset time threshold; The second preset signal fault sub-condition is: the time during which the first state monitoring signal and the second state monitoring signal or both are high level signals is greater than a first preset time threshold; The third preset signal fault sub-condition is: the time during which the first state monitoring signal is a high level signal or a low level signal is greater than a second preset time threshold; The fourth preset signal failure sub-condition is: the time during which the second state monitoring signal is a high level signal or a low level signal is greater than a second preset time threshold.

13. The fault monitoring method according to claim 11, characterized in that: Also includes: monitoring the altitude or atmospheric pressure of the location of the rail vehicle in real time, and generating a control signal to the drying device according to the altitude or atmospheric pressure; After the drying device performs a back-blowing regeneration operation according to the control signal, the current volume flow of the main air supply unit is monitored, and whether the drying device fails is determined based on the current volume flow.

14. The fault monitoring method according to claim 13, characterized in that: The current volumetric flow is a first volumetric flow or a second volumetric flow, wherein the first volumetric flow includes a first volumetric sub-flow corresponding to the first dryer and a second volumetric sub-flow corresponding to the second dryer; The second volumetric flow rate includes a third volumetric sub-flow rate corresponding to the first dryer and a fourth volumetric sub-flow rate corresponding to the second dryer; Wherein, determining whether the drying device fails according to the current volume flow rate includes: In response to monitoring that the first volume sub-flow rate and the second volume sub-flow rate satisfy at least one of a first preset volume flow rate fault condition, determining that the drying device has failed; In response to monitoring that the third volume sub-flow rate and the fourth volume sub-flow rate satisfy at least one of a second preset volume flow rate failure condition, it is determined that the drying device fails.

15. The fault monitoring method according to claim 14, characterized in that: The first preset volume flow fault condition includes a first preset volume flow fault sub-condition and a second preset volume flow fault sub-condition; The second preset volume flow fault condition includes a third preset volume flow fault sub-condition and a fourth preset volume flow fault sub-condition, wherein: The first preset volume flow fault sub-condition is: the maximum value of the first volume sub-flow and the second volume sub-flow is greater than a preset volume flow threshold; The second preset volume flow fault sub-condition is: a ratio of an absolute value of a difference between the first volume sub-flow and the second volume sub-flow to a sum of the first volume sub-flow and the second volume sub-flow is greater than a preset ratio threshold; The third preset volume flow fault sub-condition is: the maximum value of the third volume sub-flow and the fourth volume sub-flow is greater than a preset volume flow threshold; The fourth preset volume flow fault sub-condition is: a ratio of an absolute value of a difference between the third volume sub-flow and the fourth volume sub-flow to a sum of the third volume sub-flow and the fourth volume sub-flow is greater than a preset ratio threshold.

16. A method for testing the main air supply unit according to any one of claims 1 to 10, characterized in that: include: performing a power-off operation on a first solenoid valve of the first dryer and a second solenoid valve of the second dryer; Starting the main air supply unit and continuously running it for a preset time, obtaining a first test volume flow corresponding to the first dryer and a second test volume flow corresponding to the second dryer from a preset first flow meter and a preset second flow meter; In response to determining that the first test volumetric flow rate and the second test volumetric flow rate satisfy at least one of a first preset volumetric flow rate test condition, it is determined that the drying device has failed the test.

17. The testing method according to claim 16, characterized in that: The first preset volume flow test condition includes a first preset volume flow test sub-condition and a second preset volume flow test sub-condition, wherein: The first preset volume flow test sub-condition is: the maximum value of the first test volume flow and the second test volume flow is greater than a preset test volume flow threshold; The second preset volume flow test sub-condition is: a ratio of an absolute value of a difference between the first test volume flow and the second test volume flow to a sum of the first test volume flow and the second test volume flow is greater than a preset test ratio threshold.

18. The testing method according to claim 16, characterized in that: Also includes: performing a power supply operation on a first solenoid valve of the first dryer and a second solenoid valve of the second dryer; Starting the main air supply unit and continuously running it for a preset time, obtaining a third test volume flow corresponding to the first dryer and a fourth test volume flow corresponding to the second dryer from a preset first flow meter and a preset second flow meter; In response to determining that the third test volumetric flow rate and the fourth test volumetric flow rate satisfy at least one of a second preset volumetric flow rate test condition, it is determined that the drying device has failed the test.

19. The testing method according to claim 18, characterized in that: The second preset volume flow test condition includes a third preset volume flow test sub-condition and a fourth preset volume flow test sub-condition, wherein: The third preset volume flow test sub-condition is: the maximum value of the third test volume flow and the fourth test volume flow is greater than a preset volume flow threshold; The fourth preset volume flow test sub-condition is: a ratio of an absolute value of a difference between the third test volume flow and the fourth test volume flow to a sum of the third test volume flow and the fourth test volume flow is greater than a preset ratio threshold.

20. The testing method according to claim 16, wherein: Also includes: performing a power-off operation on a first solenoid valve of the first dryer and a second solenoid valve of the second dryer; Start and stop the main air supply unit in sequence based on the preset test sequence table, and immediately enter the next sequence operation after the current sequence operation is completed; During the operation of the main air supply unit, the time when the four pressure switches of the drying device are in the on and off states is monitored and recorded in real time, and a judgment is made according to a preset fault logic table. If a fault is reported, it is determined that the drying device has failed the test.

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