Straddle type monorail vehicle air compressor control method and system

Abstract

The invention discloses a straddle type monorail vehicle air compressor control method and system, and belongs to the field of rail train air compressor control. The method is applied to two air compressors, located in different carriages, of a straddle type monorail vehicle air supply system, and comprises the steps that one air compressor and a pressure sensor of the air compressor are selected as a main control unit, and the other air compressor and a pressure sensor of the air compressor are automatically used as a standby unit; acquiring a pressure signal of the main control unit in real time; and according to the pressure signal of the main control unit, the start and stop of the main control unit and the standby unit are controlled in a grading manner. Through a staged control strategy, on the basis of comprehensively meeting various working condition requirements of the vehicle, noise pollution generated by continuous double-machine operation is effectively reduced, the risk of lubricating oil emulsification caused by too short starting and stopping time is reduced, the power grid impact on a vehicle electrical system is remarkably relieved, and the safety of the vehicle is improved. Therefore, overall optimization is achieved in the aspects of reliability, economical efficiency and comfort.

Description

Technical Field

[0001] This invention belongs to the field of air compressor control for rail trains. Specifically, this invention relates to a control method and system for an air compressor in a straddle-type monorail vehicle. Background Technology

[0002] Currently, in monorail straddle-type rail transit systems, whether using 4-car or 6-car trains, the air supply system is typically powered by two air compressors. Due to the unique structural form and spatial layout of monorail vehicles, the exhaust capacity of a single air compressor cannot independently meet the air requirements of the entire vehicle. Therefore, the system design must rely on the coordinated operation of two air compressors, starting and running simultaneously to ensure stable air supply pressure and flow. Based on this technical requirement, the current control strategy employs a two-compressor linkage control logic, achieving synchronous start-up and synchronous shutdown.

[0003] While this control method is structurally simple, it reveals several significant drawbacks in actual operation. First, the simultaneous start-up of both compressors generates substantial instantaneous noise, significantly impacting the surrounding acoustic environment. Second, under normal operating conditions, the overall running time of the air compressors is relatively short, resulting in insufficient temperature rise of the internal lubricating oil. This makes it difficult to effectively evaporate moisture mixed in the oil, increasing the risk of lubricating oil emulsification over long-term operation, affecting lubrication performance and equipment lifespan. Furthermore, the simultaneous start-up and shutdown of two high-power devices creates a significant current surge in the vehicle's power supply system within a short period, potentially affecting the stable operation of other onboard electrical equipment and negatively impacting the load balance of the power system. Therefore, the current control strategy has room for optimization in terms of operational economy, equipment maintenance, and system compatibility.

[0004] Therefore, this invention proposes a control method and system for an air compressor in a straddle-type monorail vehicle. Summary of the Invention

[0005] This invention aims to overcome the shortcomings of existing technologies and proposes a control method and system for an air compressor in a straddle-type monorail vehicle to achieve the following objectives: through a phased control strategy, it effectively reduces noise pollution caused by continuous dual-machine operation, reduces the risk of lubricating oil emulsification due to excessively short start-stop times, and significantly mitigates the impact on the power grid of the vehicle's electrical system, thereby achieving overall optimization in terms of reliability, economy, and comfort, while fully meeting the needs of various operating conditions of the vehicle.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a control method for air compressors in straddle-type monorail vehicles, the method being applied to two air compressors located in different carriages of the air supply system of straddle-type monorail vehicles, comprising: Select one air compressor and its pressure sensor as the main control unit, and the other air compressor and its pressure sensor automatically serve as the backup unit. Real-time acquisition of pressure signals from the main control unit; Based on the pressure signal from the main control unit, the start-up and shutdown of the main control unit and the backup unit are controlled in stages.

[0007] Preferably, the start and stop of the main control unit and the backup unit are controlled in stages according to the pressure signal of the main control unit, including: preset a first pressure threshold and a second pressure threshold, wherein the first pressure threshold is less than the second pressure threshold; when 0 < the pressure of the main control unit ≤ the first pressure threshold, the main control unit and the backup unit are controlled to start running simultaneously.

[0008] Preferably, the start and stop of the main control unit and the backup unit are controlled in stages according to the pressure signal of the main control unit, including: when the pressure of the main control unit is less than the first pressure threshold and less than the second pressure threshold, the main control unit is controlled to start or continue to work, while the backup unit is stopped.

[0009] Preferably, the start and stop of the main control unit and the backup unit are controlled in stages according to the pressure signal of the main control unit, including: when the pressure of the main control unit is greater than the second pressure threshold, the main control unit and the backup unit are both controlled to stop.

[0010] Preferably, the first pressure threshold is set to 6.5 bar, and the second pressure threshold is set to 9 bar.

[0011] Preferably, the method further includes: when only the main control unit is running, if within a preset period of time, the first rise threshold is less than the pressure rise of the main control unit and the pressure rise is less than the preset second rise threshold, then it is determined that the current main control unit is not supplying enough gas, and the standby unit is immediately started.

[0012] Preferably, regardless of how many air compressors are running, if the pressure rise of the main control unit is less than or equal to a preset first rise threshold within a preset period of time, the pressure signal of the current main control unit is determined to be invalid. Correspondingly, the standby unit is started and used as the new main control unit, and the original main control unit becomes the new standby unit.

[0013] Preferably, the first rise threshold is 0.3 bar and the second rise threshold is 0.5 bar.

[0014] Preferably, the method further includes: presetting a reliable range for the pressure signal of the main control unit; when the pressure signal of the main control unit exceeds the reliable range, determining that the pressure signal of the current main control unit is unreliable; correspondingly, controlling the backup unit to start and using it as the new main control unit, and then the original main control unit becomes the new backup unit.

[0015] This application also provides a straddle-type monorail vehicle air compressor control system, using the above-described straddle-type monorail vehicle air compressor control method, characterized in that: the system includes: Controller; The main control unit includes the main control air compressor and the main control pressure sensor; The backup unit includes a backup air compressor and a backup pressure sensor; The controller is connected to the main control air compressor, the main control pressure sensor, the standby air compressor, and the standby pressure sensor respectively, and is used to acquire the data collected by the main control pressure sensor and the standby pressure sensor, and control the start and stop of the main control air compressor and the standby air compressor accordingly; the main control pressure sensor and the standby pressure sensor are both used to collect the air supply pressure of the air supply system.

[0016] The technical effects of this invention are as follows: This invention employs a tiered control mechanism for the start-stop control of two air compressors. This not only effectively ensures the vehicle's pneumatic needs under different operating conditions but also significantly reduces equipment operating noise, minimizes the risk of lubricating oil emulsification caused by frequent start-stop cycles, and effectively mitigates the instantaneous impact on the vehicle's electrical grid. This achieves a comprehensive improvement in economy, reliability, and environmental friendliness. Furthermore, the air compressor control system of this invention has adaptive operating condition capabilities. When high loads or extreme environmental conditions are detected, the standby air compressor is dynamically activated, forming a dual-machine coordinated air supply to ensure continuous and stable air pressure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a control method for an air compressor in a straddle-type monorail vehicle, provided as an embodiment of the present invention. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. This is to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solutions of the present invention, and to facilitate its implementation. It should be noted that the terms "first," "second," etc., used in this application are only for the convenience of describing the technical solutions and to distinguish components; the corresponding component configurations may be the same or different, and are not intended to limit the scope of this application. To make the technical solutions of the present invention clearer, the present invention will be explained and illustrated through the following embodiments.

[0019] To address the issues of response lag and insufficient energy efficiency in current air compressor control strategies, this invention provides a method for controlling air compressors in straddle-type monorail vehicles. The method is applied to two air compressors located in different carriages within the air supply system of a straddle-type monorail vehicle. The method includes: Select one air compressor and its pressure sensor as the main control unit, and the other air compressor and its pressure sensor automatically serve as the backup unit. Real-time acquisition of pressure signals from the main control unit (i.e., the gas supply pressure of the gas supply system collected by the pressure sensor of the main control unit); Based on the pressure signal from the main control unit, the start-up and shutdown of the main control unit and the backup unit are controlled in stages.

[0020] In this embodiment, the selection of the main control unit and the backup unit adopts an alternating single-day and double-day rotation mechanism, allowing the two air compressors and their sensors to take turns serving as the main control unit. By periodically alternating the use of the two air compressors, excessive wear caused by a single device serving as the main control unit for an extended period can be avoided. This balanced usage method keeps the two devices at similar levels of wear, thereby extending the overall system's service life.

[0021] This embodiment controls the start and stop of the main control unit and the backup unit in stages according to the pressure signal of the main control unit, including three stages: when the initial system pressure is lower than the set threshold, two air compressors are started simultaneously to quickly build up pressure; when the pressure reaches the preset working range, the system will automatically switch the operation mechanism according to odd and even days; after entering the stable operation stage, it will switch to a single air compressor-dominated mode to balance energy efficiency and equipment life.

[0022] Specifically, a first pressure threshold and a second pressure threshold are preset, wherein the first pressure threshold is less than the second pressure threshold; when 0 < the pressure of the main control unit ≤ the first pressure threshold, the main control unit and the backup unit are controlled to start running simultaneously.

[0023] When the pressure of the main control unit is less than the first pressure threshold and less than or equal to the second pressure threshold, the main control unit is controlled to start or remain in operation, while the backup unit is stopped.

[0024] When the pressure of the main control unit exceeds the second pressure threshold, both the main control unit and the backup unit are stopped.

[0025] In this embodiment, the first pressure threshold is set to 6.5 bar, and the second pressure threshold is set to 9 bar. In specific implementations, the appropriate threshold can be flexibly selected based on actual conditions. Figure 1As shown, vehicle A's air compressor and its pressure sensor are designated as the main control unit. When the pressure is between 0 and 6.5 bar, both air compressors are controlled to start simultaneously. Once vehicle A's air compressor reaches 6.5 bar, vehicle B's air compressor stops working, while vehicle A's air compressor continues to operate until the pressure rises to 9.0 bar, at which point it automatically stops. During subsequent operation, if vehicle A's air compressor pressure drops below 6.5 bar due to vehicle air consumption, the system will restart vehicle A's air compressor, restoring its pressure to 9.0 bar before stopping. When vehicle B's air compressor and its pressure sensor act as the main control unit, its control logic is completely consistent with vehicle A's, only the master-slave roles are reversed, thus ensuring stable and efficient air supply control in both modes.

[0026] Traditional control methods involve two air compressors operating completely independently or simply starting and stopping simultaneously. This invention, however, designates a master control unit that uses a unified pressure signal to direct both air compressors, avoiding frequent or oscillating starts and stops caused by slight differences in the signals from two pressure sensors, thus reducing mechanical wear. Furthermore, by setting two pressure thresholds, it achieves stepped start-stop control of the air compressors. At low airflow rates, only the master compressor is activated, allowing the standby compressor to rest. This avoids energy waste caused by simultaneous operation of both compressors under low load conditions, aligning with the trend of energy-saving operation of air compressors. Simultaneously, this balanced operation strategy helps to balance the cumulative operating time and wear of the two compressors, preventing overuse of a single compressor and extending the overall lifespan of the air supply system.

[0027] When the vehicle is under severe operating conditions, air consumption increases significantly, and the exhaust volume of a single air compressor is insufficient to meet system requirements. Therefore, this embodiment adds corresponding detection logic: when only the main control unit is running, if within a preset time period, the first rise threshold is less than the pressure rise of the main control unit and the pressure rise is less than a preset second rise threshold, it is determined that the current air supply to the main control unit is insufficient, and the backup unit is immediately activated. For example, when only a single air compressor is running, if the pressure rise of the main control unit is less than 0.5 bar within a 60-second time window, the control unit will automatically determine that the current air supply is insufficient and immediately send a start request to the other air compressor. This linkage mechanism can quickly respond to changes in system pressure, achieving coordinated operation of both compressors, effectively increasing the total air supply, thereby ensuring that the train can still obtain a continuous and stable air supply under severe operating conditions.

[0028] Furthermore, this embodiment also significantly enhances the detection and handling capabilities for fault conditions: specifically, this embodiment continuously monitors the effectiveness of the vehicle pressure signal, including: Regardless of the number of air compressors running, if the pressure rise of the main control unit is less than or equal to a preset first rise threshold within a preset time period, the pressure signal of the current main control unit is determined to be faulty. Correspondingly, the standby unit is activated and becomes the new main control unit, while the original main control unit becomes the new standby unit. For example, if a pressure change of less than 0.3 bar is detected within a 75-second time window, it is considered that there is no effective pressure feedback response, the pressure signal of the current main control unit is determined to be faulty, and the main control switching mechanism is triggered, activating the standby control unit to continue system operation.

[0029] In this embodiment, the first rise threshold is 0.3 bar and the second rise threshold is 0.5 bar. In specific implementation, the two thresholds can be flexibly selected according to the actual situation.

[0030] The effectiveness of continuously monitoring vehicle pressure signals also includes: A reliable range (e.g., 0-10 bar) is preset for the pressure signal of the main control unit. When the pressure signal of the main control unit exceeds the reliable range, it is determined that the pressure signal of the current main control unit is unreliable. Correspondingly, the backup unit is started and used as the new main control unit, and the original main control unit becomes the new backup unit, thereby avoiding system failure due to a single abnormal signal.

[0031] This embodiment also provides a straddle-type monorail vehicle air compressor control system, using the above-described straddle-type monorail vehicle air compressor control method, the system comprising: Controller; The main control unit includes the main control air compressor and the main control pressure sensor; The backup unit includes a backup air compressor and a backup pressure sensor; The controller is connected to the main control air compressor, the main control pressure sensor, the standby air compressor, and the standby pressure sensor respectively, and is used to acquire the data collected by the main control pressure sensor and the standby pressure sensor, and control the start and stop of the main control air compressor and the standby air compressor accordingly; the main control pressure sensor and the standby pressure sensor are both used to collect the air supply pressure of the air supply system.

[0032] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A control method for an air compressor in a straddle-type monorail vehicle, characterized in that: The method is applied to two air compressors located in different carriages of a straddle-type monorail vehicle's air supply system, including: Select one air compressor and its pressure sensor as the main control unit, and the other air compressor and its pressure sensor automatically serve as the backup unit. Real-time acquisition of pressure signals from the main control unit; Based on the pressure signal from the main control unit, the start-up and shutdown of the main control unit and the backup unit are controlled in stages.

2. The method for controlling an air compressor in a straddle-type monorail vehicle according to claim 1, characterized in that: Based on the pressure signal from the main control unit, the start and stop of the main control unit and the backup unit are controlled in stages, including: presetting a first pressure threshold and a second pressure threshold, wherein the first pressure threshold is less than the second pressure threshold; when 0 < the pressure of the main control unit ≤ the first pressure threshold, the main control unit and the backup unit are controlled to start running simultaneously.

3. The method for controlling an air compressor in a straddle-type monorail vehicle according to claim 2, characterized in that: Based on the pressure signal from the main control unit, the start and stop of the main control unit and the backup unit are controlled in stages, including: when the pressure of the main control unit is less than the first pressure threshold and less than the second pressure threshold, the main control unit is controlled to start or remain in operation, while the backup unit is stopped.

4. The air compressor control method for a straddle-type monorail vehicle according to claim 3, characterized in that: Based on the pressure signal from the main control unit, the start and stop of the main control unit and the backup unit are controlled in stages, including: when the pressure of the main control unit is greater than the second pressure threshold, both the main control unit and the backup unit are controlled to stop.

5. The method for controlling an air compressor in a straddle-type monorail vehicle according to claim 4, characterized in that: The first pressure threshold is set to 6.5 bar, and the second pressure threshold is set to 9 bar.

6. A method for controlling an air compressor in a straddle-type monorail vehicle according to claim 4 or 5, characterized in that: The method further includes: when only the main control unit is running, if within a preset period of time, the first rise threshold is less than the pressure rise of the main control unit and the second rise threshold is less than the preset pressure rise threshold, then it is determined that the current main control unit is not supplying enough gas, and the standby unit is immediately started.

7. The method for controlling an air compressor in a straddle-type monorail vehicle according to claim 6, characterized in that: Regardless of how many air compressors are running, if the pressure rise of the main control unit is less than or equal to the preset first rise threshold within a preset period of time, the pressure signal of the current main control unit is determined to be invalid. Correspondingly, the backup unit is started and used as the new main control unit, while the original main control unit becomes the new backup unit.

8. The method for controlling an air compressor in a straddle-type monorail vehicle according to claim 7, characterized in that: The first rise threshold is 0.3 bar, and the second rise threshold is 0.5 bar.

9. A method for controlling an air compressor in a straddle-type monorail vehicle according to claim 4 or 5, characterized in that: The method further includes: presetting a reliable range for the pressure signal of the main control unit; when the pressure signal of the main control unit exceeds the reliable range, determining that the pressure signal of the current main control unit is unreliable; correspondingly, controlling the backup unit to start and using it as the new main control unit, then the original main control unit becomes the new backup unit.

10. A straddle-type monorail vehicle air compressor control system, using the straddle-type monorail vehicle air compressor control method according to any one of claims 1-9, characterized in that: The system includes: Controller; The main control unit includes the main control air compressor and the main control pressure sensor; The backup unit includes a backup air compressor and a backup pressure sensor; The controller is connected to the main control air compressor, the main control pressure sensor, the standby air compressor, and the standby pressure sensor respectively, and is used to acquire the data collected by the main control pressure sensor and the standby pressure sensor, and control the start and stop of the main control air compressor and the standby air compressor accordingly; the main control pressure sensor and the standby pressure sensor are both used to collect the air supply pressure of the air supply system.

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