Train sewage tank sewage suction control method and system and readable storage medium

Abstract

The application discloses a train sewage tank sewage suction control method and system and a readable storage medium, and relates to the technical field of trains. The train sewage tank sewage suction control method comprises the following steps: determining a target sewage tank to be suctioned; after detecting that an external sewage suction device is connected with a sewage discharge interface of the target sewage tank, controlling the target sewage tank to enter a sewage suction state; in the sewage suction state, turning on a sewage discharge channel of the target sewage tank and controlling the external sewage suction device to perform sewage suction; according to the emptying state of the target sewage tank, stopping the sewage suction and closing the sewage discharge channel; after the sewage discharge channel is closed, separating the external sewage suction device from the sewage discharge interface and controlling the target sewage tank to exit the sewage suction state. The train sewage tank sewage suction control method and system and the readable storage medium can effectively solve the problem that sewage suction operation and original negative pressure control logic of a sewage tank are difficult to coordinate in the sewage suction process of a train negative pressure maintaining type sewage tank.

Description

Technical Field

[0001] This invention relates to the field of train technology, and more specifically, to a method, system, and readable storage medium for controlling the suction of train waste tanks. Background Technology

[0002] Rail vehicles are typically equipped with a waste collection system to collect sewage and wastewater generated in the toilets. The sewage tanks in the waste collection system mainly include atmospheric pressure sewage tanks and negative pressure maintaining sewage tanks. Among them, the negative pressure maintaining sewage tank maintains a predetermined negative pressure during normal operation, and the negative pressure status inside the tank is monitored and adjusted by a corresponding negative pressure detection device, negative pressure generating device and controller. When the sewage tank fails to form the required negative pressure within the set time, the controller will usually generate a fault alarm.

[0003] After a train enters a maintenance depot, preparation depot, or stops at a station, it needs to use external sewage suction equipment to remove the sewage from the sewage tank. Normal pressure sewage tanks can be suctioned after the sewage discharge channel is opened, while negative pressure sewage tanks involve the coordination between changes in negative pressure inside the tank, the working status of the sewage collection system, and the sewage suction operation status during the sewage suction process. Existing sewage suction operations usually rely on operators to operate valves and sewage suction equipment according to the site conditions.

[0004] During the suction process of a negative pressure maintaining sewage tank, if the suction operation is not coordinated with the original negative pressure control process of the sewage collection system, the negative pressure generating device may continue to work during the suction or generate an invalid fault alarm. Improper operation sequence may also cause the sewage tank to be subjected to abnormal pressure difference, affecting the normal progress of the suction operation and subsequent system recovery. Therefore, the safety and reliability of the suction process depend heavily on the manual operation experience.

[0005] In summary, how to solve the problem of the difficulty in coordinating the sewage suction operation with the original negative pressure control logic of the sewage tank during the sewage suction process of the train negative pressure maintaining type sewage tank is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a method, system and readable storage medium for controlling the suction of a train sewage tank, which can effectively solve the problem that the suction operation and the original negative pressure control logic of the sewage tank are difficult to coordinate during the suction process of a train negative pressure maintaining sewage tank.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A method for controlling sewage suction in a train sewage tank includes: Identify the target waste bin to be vacuumed; After detecting that the external suction device is connected to the drain port of the target sewage tank, the target sewage tank is controlled to enter the suction state; In the state where the sewage can be suctioned, the sewage discharge channel of the target sewage tank is opened, and the external sewage suction device is controlled to perform sewage suction. Stop vacuuming and close the sewage discharge channel based on the emptying status of the target sewage tank; After the sewage discharge channel is closed, the external sewage suction device is separated from the sewage discharge interface, and the target sewage tank is controlled to exit the sewage suction state; In the case that the target waste tank is a negative pressure maintaining waste tank, controlling the target waste tank to enter the waste-absorbing state includes: connecting the target waste tank to the outside and preventing the target waste tank from restoring negative pressure; and opening the waste discharge channel after the negative pressure in the target waste tank meets the preset conditions.

[0008] In some technical solutions, the absorbent state includes at least one of the following: The negative pressure generating device corresponding to the target waste tank stops working; The pipes connecting the toilet to the target sludge tank should be kept closed; Fault alarms caused by changes in negative pressure in the target waste tank are suspended or disabled; The connection between the target waste bin and the outside world is open.

[0009] In some technical solutions, determining the target waste bin includes: Obtain the liquid level information of the train's sewage tank; The target waste tank is determined based on the liquid level information; The train also sends sewage tank configuration information to the external sewage suction equipment, which at least indicates the working pressure type of the sewage tank.

[0010] In some technical solutions, before detecting the connection between the external suction device and the sewage discharge interface, the following steps are also included: Identify the location of the sewage discharge port; Based on the location of the sewage discharge port, control the movable interface to dock with the sewage discharge port; The connection status between the movable interface and the sewage outlet is detected by a connection detection device.

[0011] In some technical solutions, when the target waste tank is a negative pressure maintaining waste tank: The control valve is opened to connect the target waste tank to the outside environment; Detect whether the connecting valve is fully open and the negative pressure state inside the target waste tank; When the connecting valve is fully open and the negative pressure condition meets the preset condition, the sewage discharge channel is allowed to be opened.

[0012] In some technical solutions, the emptying status of the target waste tank is determined based on at least one of the following information: Liquid level information output by a liquid level detection device installed inside the target sludge tank; Liquid level information obtained by identifying a liquid level display device installed on the outside of the train; Logical relationship between multiple liquid level detection signals.

[0013] In some technical solutions, the train sewage tank suction control method further includes at least one of the following: During the vacuuming process, the connection status between the external vacuuming device and the sewage outlet is detected, and when an abnormal separation is detected, the vacuuming is stopped, the sewage outlet is closed, and an abnormal information is output. After the sewage suction is completed, check whether the sewage discharge channel is closed in place, and allow the external sewage suction equipment to be separated from the sewage discharge interface after the sewage discharge channel is closed in place; If the target waste tank is a negative pressure maintaining waste tank, close the communication channel between the target waste tank and the outside world, and control the target waste tank to restore negative pressure.

[0014] A train sewage tank suction control system includes: The target determination module is used to determine the target sludge bin to be vacuumed. The connection judgment module is used to detect whether the sewage discharge interface of the target sewage tank is in a connected state; The status control module is used to control the target sewage tank to enter the sewage suction state after the sewage discharge interface is in the connected state; The sludge suction control module is used to open the sludge discharge channel of the target sludge tank in the sludge suction state and output a sludge suction start command; The emptying judgment module is used to determine that the sludge suction is complete based on the emptying status of the target sludge tank; The end control module is used to output a suction stop command and close the sewage discharge channel after the sewage suction is completed, and to control the target sewage tank to exit the suctionable state after the sewage discharge interface is disconnected. In the case where the target waste tank is a negative pressure maintaining waste tank, the state control module is used to connect the target waste tank to the outside and prevent the target waste tank from restoring negative pressure, and the sewage suction control module is used to open the sewage discharge channel after the negative pressure in the target waste tank meets the preset conditions.

[0015] In some technical solutions, the train sewage tank suction control system further includes at least one of the following modules: The communication module is used to acquire sludge tank configuration information and liquid level information, and to transmit sludge suction control information; The interface status acquisition module is used to acquire the connection status of the sewage discharge interface; Valve position status acquisition module, used to acquire the open / closed position status of drain valve and / or connecting valve; The pressure status acquisition module is used to acquire the negative pressure status inside the negative pressure maintaining type sludge tank; The liquid level status acquisition module is used to acquire the liquid level status of the target sludge tank; The fault protection module is used to stop the suction, close the discharge channel and / or output fault information when an abnormal interface separation, abnormal valve action or communication is detected.

[0016] A readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the train sewage tank suction control method described in any of the preceding claims.

[0017] The train sewage tank suction control method provided by this invention has at least the following advantages compared with the prior art: 1. By controlling the target sewage tank to enter the sewage suction state after confirming that the external sewage suction equipment is connected to the sewage discharge interface, the interface connection status and the sewage tank status switching can be correlated, avoiding the sewage discharge channel from being connected in advance before the sewage suction equipment is connected, thus improving the reliability of the sewage suction start-up process.

[0018] 2. For negative pressure maintaining type sewage tanks, by first connecting the sewage tank to the outside and suppressing the sewage tank from restoring negative pressure, and then opening the sewage discharge channel after the negative pressure in the tank meets the preset conditions, the interference of the negative pressure control process on the sewage suction operation can be reduced, and the risk of abnormal pressure difference caused by opening the sewage discharge channel when the negative pressure in the tank is not fully released can be reduced.

[0019] 3. By opening the sewage discharge channel and performing sewage suction when the sewage can be suctioned, and then stopping sewage suction and closing the sewage discharge channel according to the emptying status of the sewage tank, the timing of the end of sewage suction can be matched with the actual emptying status of the sewage tank, reducing the situation of insufficient sewage suction or ineffective continuous sewage suction.

[0020] 4. By closing the sewage channel and then separating the external sewage suction equipment from the sewage interface, and controlling the sewage tank to exit the sewage suction state, an orderly control process of connection, sewage suction, closure, separation and state restoration can be formed, reducing the risk of sewage leakage or abnormal sewage tank status when the interface is separated, and improving the safety and consistency of the entire sewage suction process.

[0021] The train waste tank suction control system and readable storage medium provided by the present invention directly or indirectly reference the above-mentioned train waste tank suction control method and have the same beneficial effects. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic flowchart of the train sewage tank suction control method provided by the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Train sewage suction usually relies on manual operation of external sewage suction equipment and related valves. When the sewage suction operation lacks coordination with the original negative pressure control process of the sewage tank, it may cause the negative pressure generating device to malfunction, false alarms, abnormal pressure difference, and abnormal system recovery. As a result, the safety and reliability of the sewage suction process are highly dependent on human experience.

[0026] In view of the above issues, refer to Figure 1 This application provides a method, system, and readable storage medium for controlling the suction of a train waste tank, which can effectively solve the problem of difficulty in coordinating the suction operation with the original negative pressure control logic of the waste tank during the suction process of a train negative pressure maintaining waste tank.

[0027] Specifically, a method for controlling sewage suction in train sewage tanks is provided, including: S1. Determine the target waste bin to be vacuumed; S2. After detecting that the external suction device is connected to the drain interface of the target sewage tank, control the target sewage tank to enter the suction state. S3. In the state where suction is possible, open the sewage discharge channel of the target sewage tank and control the external sewage suction equipment to perform sewage suction; S4. Stop vacuuming and close the drain channel according to the emptying status of the target sludge tank; S5. After the sewage discharge channel is closed, the external sewage suction equipment is separated from the sewage discharge interface, and the target sewage tank is controlled to exit the sewage suction state. In the case that the target waste tank is a negative pressure maintaining waste tank, controlling the target waste tank to enter the waste suction state includes: connecting the target waste tank to the outside and preventing the target waste tank from restoring negative pressure; and opening the waste discharge channel after the negative pressure in the target waste tank meets the preset conditions.

[0028] Using the waste tank to be processed as the controlled object, a continuous control process is formed, consisting of interface connection confirmation, waste tank status switching, waste discharge channel opening, waste suction execution, emptying judgment, channel closure, interface separation, and status restoration. The waste tank is only allowed to enter a state suitable for waste suction after confirming that the external waste suction equipment has been connected, thereby avoiding accidental discharge of waste when the waste suction equipment has not been connected. For negative pressure maintaining waste tanks, the negative pressure inside the tank is first released and the re-establishment of negative pressure is temporarily prevented. Then, the waste discharge channel is opened after the negative pressure reaches the condition that allows waste discharge. This coordinates the original negative pressure control process of the train with the external waste suction operation, reducing the impact of abnormal pressure difference, repeated vacuuming, and invalid fault alarms on the waste suction operation.

[0029] In one specific application, the train control system sends the liquid level and related operating information of each sewage tank to the platform-side controller. The platform-side controller identifies the sewage tank that needs to be vacuumed and controls the movable interface to move to the corresponding sewage outlet. When the connection detection switch at the sewage valve port confirms that the interface has been inserted, the sewage system controller puts the sewage tank into the vacuuming state. For negative pressure maintaining sewage tanks, the sewage system controller first controls the opening of the connecting valve to connect the sewage tank to the atmosphere, while simultaneously prohibiting the vacuum generator from working and keeping the pipeline valve between the toilet and the sewage tank closed. When the vacuum switch indicates that the negative pressure in the tank has been released, it controls the opening of the sewage valve and sends a start-up message to the vacuuming equipment. When the zero liquid level signal indicates that the sewage tank has been emptied, the vacuuming equipment stops working, the sewage valve closes, the interface is retracted, the connecting valve closes, and then the vacuum generator re-establishes the negative pressure in the sewage tank, restoring the sewage tank to normal working state. For atmospheric pressure sewage tanks, the process of venting to depressurize and restoring negative pressure can be omitted.

[0030] In some cases, the target sewage tank can be automatically selected by the platform controller, or designated by the train control system, maintenance personnel, or preset work tasks; external sewage suction equipment can be fixedly installed on the platform or in the maintenance depot, or installed on battery-powered vehicles, AGVs, or other unmanned mobile carriers; whether the negative pressure inside the tank meets the sewage discharge conditions can be determined by a vacuum switch, pressure sensor, differential pressure sensor, or preset depressurization time; the sewage discharge channel can be controlled by electric valves, pneumatic valves, solenoid valves, or other controllable opening and closing components; suppressing negative pressure recovery can be achieved by stopping the vacuum generator, or by cutting off the vacuum pipeline, pausing the negative pressure control program, or writing a sewage suction condition flag to the original controller, thus adapting to different vehicle models and different sewage collection system architectures.

[0031] In some embodiments, a vacuumable state includes at least one of the following: The negative pressure generating device corresponding to the target waste tank stops working; Keep the pipes connecting the toilet to the target sludge tank closed; Fault alarms caused by changes in negative pressure in the target waste tank are suspended or disabled; The connection between the target waste tank and the outside world is open.

[0032] The "Suctionable" status indicates that the sludge tank and its associated equipment have switched from normal operating conditions to external suction conditions. By stopping the negative pressure generator, keeping the toilet side piping closed, suspending alarms related to negative pressure changes, and keeping the sludge tank connected to the outside, the normal operating logic can be prevented from continuing to intervene during suction, thereby reducing the repeated starting of the vacuum generator, the toilet continuing to discharge waste into the sludge tank, and the generation of invalid fault information.

[0033] In practical applications, the toilet system controller sets a suction condition flag after receiving a sewage connection confirmation signal. During the validity period of this flag, the controller does not open the pipeline valve between the toilet and the sewage tank, does not perform vacuuming of the sewage tank, and suspends the vacuuming timeout alarm triggered by the disappearance of the vacuum switch signal. For negative pressure maintaining sewage tanks, the connecting valve remains open during suction to allow the pressure inside the tank to tend to balance with the external pressure. After suction is completed and the sewage valve, connecting valve, and interface status meet the recovery conditions, the controller clears the suction condition flag and restores the original toilet control, negative pressure control, and fault monitoring logic.

[0034] The vacuuming status can be represented by software status bits, state machine nodes, relay interlock signals, or hardware mode switches; alarm handling can be done by complete suspension, delayed triggering, temporary shielding, or marking the corresponding event as a normal vacuuming event and not recording it in the fault record; in scenarios with high safety requirements, the vacuuming status can also include additional conditions such as the train being stationary, the corresponding toilet being locked, the vacuuming interface being locked in place, or no one entering the vacuuming area, to further improve the safety of the vacuuming process.

[0035] In some embodiments, determining the target sludge bin includes: Obtain the liquid level information of the train's sewage tank; Determine the target waste tank based on the liquid level information; The train also sends sewage tank configuration information to external sewage suction equipment, which at least indicates the working pressure type of the sewage tank.

[0036] Determining the target for suction by the liquid level in the sludge tank allows the suction task to be matched with the actual storage status of each sludge tank, avoiding ineffective operations on sludge tanks with low liquid levels. Sending the working pressure type of the sludge tank to the external suction equipment allows the suction equipment or control system to distinguish between atmospheric pressure sludge tanks and negative pressure maintaining sludge tanks, and select the control process appropriate for the sludge tank type.

[0037] In practical applications, the train control system transmits information such as the liquid level of each carriage's sewage tank, the type of sewage tank, and whether an under-car liquid level display device is installed to the platform sewage suction equipment via a wireless network. The platform-side controller determines which carriage needs to be suctioned based on the liquid level and dispatches the corresponding sewage suction equipment. In scenarios where each carriage is equipped with one set of sewage suction equipment, multiple sewage tanks can be suctioned simultaneously. In scenarios where the number of sewage suction equipment is less than the number of sewage tanks to be suctioned, the operation priority can be determined according to the liquid level from high to low, the order of carriage positions, or the train's stopping time.

[0038] Waste tank configuration information can be transmitted via wireless LAN, train ground communication network, mobile communication network, near-field communication, or wired interface within the depot. When vehicle configuration information cannot be directly obtained, the waste tank type can be determined based on car number, vehicle database, electronic tag, QR code, or image recognition of the external structure of the waste tank. For example, the presence of a connecting valve can be used to determine whether the waste tank is a negative pressure maintaining type. The target waste tank can also be determined by combining the remaining stopping time, the availability of the waste suction equipment, and the trend of waste tank level changes, thereby improving the scheduling efficiency of multi-car waste suction tasks.

[0039] In some embodiments, before detecting the connection between the external suction device and the drain port, the method further includes: Identify the location of the sewage discharge interface; Based on the location of the sewage discharge interface, control the movable interface to connect with the sewage discharge interface; The connection status between the movable interface and the sewage outlet is detected by a connection detection device.

[0040] By identifying the location of the sewage outlet and controlling its movement to complete the connection, the need for operators to drag the suction pipe, manually search for the outlet, and manually connect the pipe can be reduced. The connection detection device provides a real connection confirmation signal, ensuring that subsequent valve actions are based on a reliable connection, thereby reducing the risk of leakage caused by opening the sewage channel if the outlet is not properly connected.

[0041] In newly built stations or maintenance depots, the sewage suction equipment can be installed on a sliding track extending along the train direction. Its moving interface is equipped with an autonomous identification probe, a drive mechanism, and a sewage suction pipeline. After the identification probe locates the sewage tank discharge port, the controller controls the sewage suction equipment to move along the track to the target position and causes the moving interface to extend towards the train. In existing stations, the sewage suction device can be installed on a battery-powered vehicle or other unmanned vehicle. The longitudinal positioning is achieved by the movement of the vehicle, and the final connection is completed by the telescopic mechanism of the interface. A micro switch, magnetic switch, or proximity switch is installed at the sewage valve port. When the interface is inserted into place, a connection confirmation signal is output to the sewage system controller.

[0042] The interface position can be identified by ordinary cameras, depth cameras, LiDAR, ultrasonic sensors, structured light devices, or preset positioning marks; the moving interface can be driven by robotic arms, linear modules, three-axis motion platforms, flexible traction mechanisms, or telescopic pipelines; the connection status can be detected by position switches, as well as by the status of locking mechanisms, sealing pressure, contact pressure, electrical contacts, or changes in pipeline negative pressure; in some cases, dual confirmation by position detection and sealing detection can be used, and the subsequent sewage suction process is only allowed when both detection results meet the requirements.

[0043] In some embodiments, when the target waste tank is a negative pressure maintaining waste tank: The control valve is opened to connect the target waste tank to the outside environment; Check whether the connecting valve is fully open and the negative pressure status inside the target waste tank; When the connecting valve is fully open and the negative pressure condition meets the preset conditions, the sewage discharge channel is allowed to be opened.

[0044] In a negative pressure maintaining sewage tank, the opening state of the connecting valve and the negative pressure state inside the tank together constitute the opening conditions of the sewage discharge channel. This dual judgment can avoid direct sewage suction when the connecting valve is not actually opened or when the tank still maintains a high negative pressure, thereby reducing the risk of the sewage tank deforming due to excessive pressure difference between the inside and outside and improving the reliability of valve control sequence.

[0045] The connecting valve and the drain valve can be electric or pneumatic, and each valve body is equipped with an open and closed position detection switch, which can be a micro switch or a magnetic switch. After confirming the connection of the suction interface, the sewage system controller outputs a connecting valve opening command and simultaneously prohibits the vacuum generator from continuing to evacuate. The controller only outputs a drain valve opening command when the connecting valve opening signal is valid and the vacuum switch signal indicates that the negative pressure inside the tank has been released. If the connecting valve does not open to the correct position within the specified time or the vacuum switch continuously indicates that there is negative pressure inside the tank, the drain valve remains closed and can output corresponding abnormal information.

[0046] Negative pressure inside the chamber can be determined by a single-point vacuum switch or by a continuously output pressure sensor. The condition for allowing sewage discharge is that the difference between the pressure inside the chamber and the atmospheric pressure is less than a preset threshold. Alternatively, the sewage valve can be opened after a preset delay after the valve is fully opened, or any two of the valve position signal, pressure signal, and delay condition can be used for cross-confirmation. The connecting valve can be a normally closed structure so that it can be automatically closed in case of power failure or malfunction, or a manual bypass mechanism can be set up so that manual handling can be performed when the automatic control fails.

[0047] In some embodiments, the emptying status of the target sludge tank is determined based on at least one of the following information: Liquid level information output by a liquid level detection device installed inside the target sludge tank; Liquid level information obtained by identifying a liquid level display device installed on the outside of the train; Logical relationship between multiple liquid level detection signals.

[0048] By determining the emptying status through the internal liquid level signal of the sludge tank, the identification result of the external liquid level display, or the logical relationship between multiple liquid level signals, the timing of stopping sludge suction can be matched with the actual remaining amount in the sludge tank. This determination can reduce the situation where sludge suction stops before the tank is emptied or continues to suction even after the tank has been emptied, and can also detect anomalies in individual detectors by using multi-level liquid level signals.

[0049] Passenger car waste tanks typically have three liquid level detection positions, while EMU waste tanks typically have five, with the lowest position corresponding to a zero liquid level. When the zero liquid level switch is triggered, the train control system sends the corresponding liquid level information to the waste suction equipment in real time, and the equipment stops suction accordingly. For trains equipped with undercarriage liquid level display devices, the image recognition component on the waste suction equipment can observe the display device. When it detects that only the zero liquid level indicator light is active, it is determined that the waste tank has been emptied. If a liquid level signal is suspected of being faulty, its reliability can be determined by combining the high and low sequence and change process of the other liquid level signals.

[0050] The liquid level detection device can be a float switch, capacitive level gauge, ultrasonic level gauge, radar level gauge, pressure level gauge, or weight detection device; the emptying status can also be determined by combining the flow rate of the suction pipeline, the pipeline pressure, the load of the suction pump, or the duration of continuous no sewage outflow; in some cases, the liquid level signal can be delayed for confirmation, shake filtering, and continuous multiple sampling to avoid frequent start-stop of the suction equipment due to liquid level fluctuations; considering the need for system simplification, only a reliable zero liquid level signal can be used as the basis for stopping suction.

[0051] In some embodiments, the train sewage tank suction control method further includes at least one of the following: During the vacuuming process, the connection status between the external vacuuming equipment and the sewage discharge interface is detected, and the vacuuming is stopped, the sewage discharge channel is closed and an abnormal information is output when an abnormal separation is detected. After the vacuuming is completed, check whether the sewage discharge channel is closed properly, and allow the external vacuuming equipment to be separated from the sewage discharge interface after the sewage discharge channel is closed properly; If the target waste tank is a negative pressure maintaining waste tank, close the connection between the target waste tank and the outside world, and control the target waste tank to restore negative pressure.

[0052] Continuous monitoring of the interface connection during sewage suction allows for timely cessation of operations and disconnection of the sewage channel in case of accidental interface detachment; interface separation is only permitted after the sewage channel is fully closed, reducing sewage leakage caused by valves not being closed; the negative pressure maintaining sewage tank can return to normal sewage collection state by reclosing the external connection channel and restoring negative pressure after sewage suction is completed, and the valve closure status can be verified using the negative pressure recovery results.

[0053] During the sewage suction process, the connection detection switch at the sewage discharge valve remains active. If the interface becomes detached, the sewage system controller immediately closes the sewage discharge valve and sends a stop command to the sewage suction equipment, while simultaneously reporting the interface detachment abnormality to the train control system. After normal sewage suction is completed, the controller first closes the sewage discharge valve and confirms the valve status through the valve's closed position detection switch. After confirmation, it retracts the movable interface and then closes the connecting valve. Subsequently, the vacuum generator is started to re-vacuum the sewage tank. If the vacuum switch recovers its effectiveness within the set time, it indicates that the sewage tank's sealing status is basically normal. If negative pressure cannot be established, a vacuum timeout fault is output, and the toilet corresponding to that sewage tank can be disabled.

[0054] When the drain valve is not fully closed, disconnection of the interface can be prohibited and the equipment can be kept locked until the valve is closed or manually released. In systems equipped with check valves, quick-shut-off valves, or leak-proof joints, interface disconnection is also permitted, while an abnormal valve output is displayed and the corresponding toilet is disabled. In the event of communication interruption, the system can switch to on-site manual observation and manual control based on the remaining operating time, or immediately prohibit sewage suction and close the relevant valves. When the valve is stuck, the system can control the valve to repeat its operation, switch to the backup drive circuit, or directly enter the fault protection state. The interface locking mechanism can also adopt a mechanical self-locking structure, so that the interface cannot be physically separated when the drain channel is not closed.

[0055] This application also provides a method for scheduling sewage suction tasks in trains with multiple sewage boxes, including: Acquire liquid level and location information of multiple sewage tanks in the train, and acquire the working status and operating location information of multiple sewage suction devices; Based on the liquid level information, the target sludge tank to be vacuumed is determined from multiple sludge tanks, and a set of vacuuming tasks including the target sludge tank is generated. The priority of the corresponding sludge suction task is determined based on the liquid level information of each target sludge tank. Based on the task priority, the location information of the target sludge tank, and the operation location information of the sludge suction equipment that is in a usable state, the sludge suction task is assigned to the corresponding sludge suction equipment; Control the vacuuming equipment assigned a vacuuming task to move to the corresponding target vacuum tank and perform vacuuming; Obtain the task execution status of each vacuuming device, and update the vacuuming task set and the working status of multiple vacuuming devices when the vacuuming task is completed or the vacuuming device is unable to continue performing the vacuuming task, so as to reallocate the unfinished vacuuming tasks.

[0056] Specifically, when a train enters or is about to enter the sewage suction area, the train control system sends the liquid level, location of each sewage tank, and sewage tank configuration information to the sewage suction equipment controller. The sewage suction equipment controller adds sewage tanks whose liquid levels meet the suction conditions to the task set and determines the task priority according to the liquid level from high to low, so that sewage tanks with larger storage capacity are given priority to be suctioned, reducing the possibility that high-liquid-level sewage tanks have not been suctioned before the train leaves the station.

[0057] When each carriage is equipped with a set of sewage suction equipment, the sewage suction equipment controller can directly assign each sewage tank task to the corresponding sewage suction equipment and control multiple sets of sewage suction equipment to work in parallel. When the number of sewage suction equipment is less than the number of target sewage tanks, the available sewage suction equipment can be assigned to the target sewage tanks with higher priority. After the current task is completed, the released sewage suction equipment will continue to be assigned to the target sewage tanks in the task set that have not yet been completed and have the highest priority.

[0058] When multiple vacuuming devices can perform the same vacuuming task, the appropriate device can be selected based on the positional relationship between the vacuuming device and the target waste bin. For example, the vacuuming device with a shorter travel distance, an earlier expected arrival time, or one that is not currently performing other tasks can be given priority. This reduces the idle travel time of the devices and increases the number of waste bins that can be vacuumed within a limited vacuuming time.

[0059] During the execution of a sewage suction task, the sewage suction equipment controller continuously receives the interface connection status, sewage suction status, and emptying status. When the target sewage tank is emptied, the corresponding task is marked as completed and the sewage suction equipment is released. When an interface connection failure, equipment failure, or communication abnormality occurs, the corresponding task is marked as pending reassignment, and other available sewage suction equipment is selected to continue execution, so as to avoid the entire task queue from being stalled due to the failure of a single sewage suction equipment.

[0060] This application also provides a train sewage tank suction control system, including: The target determination module is used to determine the target sludge bin to be vacuumed. The connection judgment module is used to detect whether the sewage discharge interface of the target sewage tank is in a connected state; The status control module is used to control the target sewage tank to enter the sewage suction state after the sewage discharge interface is in the connected state; The sludge suction control module is used to open the sludge discharge channel of the target sludge tank when sludge suction is possible, and to output a sludge suction start command; The emptying judgment module is used to determine whether the sludge suction is complete based on the emptying status of the target sludge tank; The end control module is used to output a suction stop command and close the sewage discharge channel after the sewage suction is completed, and to control the target sewage tank to exit the sewage suction state after the sewage discharge interface is disconnected; In the case of a negative pressure maintaining type sewage tank, the status control module is used to connect the target sewage tank to the outside world and prevent the target sewage tank from restoring negative pressure, while the sewage suction control module is used to open the sewage discharge channel after the negative pressure in the target sewage tank meets the preset conditions.

[0061] The target selection, interface status judgment, sludge tank status control, sludge suction start / stop, emptying judgment, and end recovery are configured as functional modules, so that each control stage can cooperate with each other in a predetermined order. For negative pressure maintaining sludge tanks, the status control function is responsible for completing depressurization and negative pressure recovery suppression, and the sludge suction control function only allows sludge discharge after the negative pressure condition is met, thereby realizing the linkage control between negative pressure status and sludge suction action.

[0062] Each functional module can be deployed in the train toilet system controller, train control system, and platform sewage suction equipment controller. The target determination module selects the target based on the liquid level of each sewage tank, the connection judgment module receives the signal from the sewage discharge valve detection switch, the status control module controls the connecting valve, vacuum generator, toilet side pipeline valve, and alarm status, the sewage suction control module controls the sewage discharge valve and sends start information to the platform equipment, the emptying judgment module processes the zero liquid level signal or the external liquid level display recognition result, and the end control module sequentially completes the sewage suction stop, sewage discharge valve closure, interface retraction, connecting valve closure, and negative pressure restoration. The train-side and platform-side controllers can exchange liquid level, valve status, and sewage suction control information via a wireless network.

[0063] Each module can be centrally located in a single controller or distributed across multiple controllers on the train side and the ground side. The controller can be a PLC, vehicle control unit, industrial computer, microcontroller, or edge computing device. In terms of software, each module can be implemented using a state machine, control program, or inter-calling program unit. In terms of hardware, it can be implemented using relay interlocking, logic gate circuits, or independent control boards. Some functional modules can be combined, for example, connection judgment and abnormal protection can be combined into an interface management module, or status control and termination control can be combined into a waste tank condition management module, thereby adapting to different hardware resources and control architectures.

[0064] In some embodiments, the train sewage tank suction control system further includes at least one of the following modules: The communication module is used to acquire sludge tank configuration information and liquid level information, and to transmit sludge suction control information; The interface status acquisition module is used to acquire the connection status of the sewage discharge interface; Valve position status acquisition module, used to acquire the open / closed position status of drain valve and / or connecting valve; The pressure status acquisition module is used to acquire the negative pressure status inside the negative pressure maintaining type sludge tank; The liquid level status acquisition module is used to acquire the liquid level status of the target sludge tank; The fault protection module is used to stop the suction, close the discharge channel and / or output fault information when an abnormal interface separation, abnormal valve action or communication is detected.

[0065] The communication module can receive information from the train regarding the sewage tank level, sewage tank type, and undercarriage level display configuration, and transmit valve opening, sewage suction start, and sewage suction stop information to the sewage suction equipment; the interface status acquisition module connects to the micro switch or magnetic switch at the sewage discharge valve port; the valve position status acquisition module connects to the open and closed position detection switches of the connecting valve and the sewage discharge valve; the pressure status acquisition module connects to the vacuum switch; the liquid level status acquisition module receives signals or image recognition results from multiple liquid level switches in the sewage tank; the anomaly protection module determines interface detachment, valve jamming, liquid level signal inconsistencies, and communication interruptions based on the above signals, and executes corresponding stop, shut-off, alarm, or toilet disabling operations.

[0066] The communication module can use CAN bus, Ethernet, wireless LAN, cellular network, or dedicated short-range wireless communication; the interface and valve position status can be obtained by limit switches, Hall switches, photoelectric switches, current detection, or encoders; the pressure status can be obtained by vacuum switches or analog pressure sensors; the abnormal protection module can adopt a local priority control strategy, in which the train-side controller independently closes the sewage valve when communication is interrupted, or it can adopt a ground-side priority control strategy, in which the sewage suction equipment stops the negative pressure source or sewage suction pump first; in order to improve reliability, redundant detection devices can be set for critical states, and the consistency of multiple detection results can be verified.

[0067] This application also provides a readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the train sewage tank suction control method described above.

[0068] The computer program may include a sludge tank information management program, an interface status acquisition program, a valve interlock program, a sludge suction state machine, a liquid level judgment program, and a fault handling program. When the program is running, the processor periodically acquires signals from the interface detection switch, valve position detection switch, vacuum switch, and liquid level switch, and outputs control commands to the connecting valve, drain valve, vacuum generator, and sludge suction equipment according to the current status. The sludge suction state machine can be sequentially set to states such as idle, docked, depressurized, sludge suction, emptying confirmation, closed, disconnected, and restored, and will only enter the next state after the allowable conditions of the previous state are met.

[0069] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0070] The above provides a detailed description of the train waste tank suction control method, system, and readable storage medium provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A method for controlling sewage suction in a train sewage tank, characterized in that, include: Identify the target waste bin to be vacuumed; After detecting that the external suction device is connected to the drain port of the target sewage tank, the target sewage tank is controlled to enter the suction state; In the state where the sewage can be suctioned, the sewage discharge channel of the target sewage tank is opened, and the external sewage suction device is controlled to perform sewage suction. Stop vacuuming and close the sewage discharge channel based on the emptying status of the target sewage tank; After the sewage discharge channel is closed, the external sewage suction device is separated from the sewage discharge interface, and the target sewage tank is controlled to exit the sewage suction state; In the case that the target waste tank is a negative pressure maintaining waste tank, controlling the target waste tank to enter the waste-absorbing state includes: connecting the target waste tank to the outside and preventing the target waste tank from restoring negative pressure; and opening the waste discharge channel after the negative pressure in the target waste tank meets the preset conditions.

2. The train sewage tank suction control method according to claim 1, characterized in that, The absorbable state includes at least one of the following: The negative pressure generating device corresponding to the target waste tank stops working; The pipes connecting the toilet to the target sludge tank should be kept closed; Fault alarms caused by changes in negative pressure in the target waste tank are suspended or disabled; The connection between the target waste bin and the outside world is open.

3. The train sewage tank suction control method according to claim 1, characterized in that, Determining the target sludge bin includes: Obtain the liquid level information of the train's sewage tank; The target waste tank is determined based on the liquid level information; The train also sends sewage tank configuration information to the external sewage suction equipment, which at least indicates the working pressure type of the sewage tank.

4. The train sewage tank suction control method according to claim 1, characterized in that, Before detecting the connection between the external suction device and the drain port, the process further includes: Identify the location of the sewage outlet; Based on the location of the sewage discharge port, control the movable interface to dock with the sewage discharge port; The connection status between the movable interface and the sewage outlet is detected by a connection detection device.

5. The train sewage tank suction control method according to claim 1, characterized in that, In the case where the target waste tank is a negative pressure maintaining waste tank: The control valve is opened to connect the target waste tank to the outside environment; Detect whether the connecting valve is fully open and the negative pressure state inside the target waste tank; When the connecting valve is fully open and the negative pressure condition meets the preset condition, the sewage discharge channel is allowed to be opened.

6. The train sewage tank suction control method according to claim 1, characterized in that, The emptying status of the target sludge tank is determined based on at least one of the following: Liquid level information output by a liquid level detection device installed inside the target sludge tank; Liquid level information obtained by identifying a liquid level display device installed on the outside of the train; Logical relationship between multiple liquid level detection signals.

7. The train sewage tank suction control method according to claim 1, characterized in that, It also includes at least one of the following: During the vacuuming process, the connection status between the external vacuuming device and the sewage outlet is detected, and when an abnormal separation is detected, the vacuuming is stopped, the sewage outlet is closed, and an abnormal information is output. After the sewage suction is completed, check whether the sewage discharge channel is closed in place, and allow the external sewage suction equipment to be separated from the sewage discharge interface after the sewage discharge channel is closed in place; If the target waste tank is a negative pressure maintaining waste tank, close the communication channel between the target waste tank and the outside world, and control the target waste tank to restore negative pressure.

8. A train sewage tank suction control system, characterized in that, include: The target determination module is used to determine the target sludge bin to be vacuumed. The connection judgment module is used to detect whether the sewage discharge interface of the target sewage tank is in a connected state; The status control module is used to control the target sewage tank to enter the sewage suction state after the sewage discharge interface is in the connected state; The sludge suction control module is used to open the sludge discharge channel of the target sludge tank in the sludge suction state and output a sludge suction start command; The emptying judgment module is used to determine that the sludge suction is complete based on the emptying status of the target sludge tank; The end control module is used to output a suction stop command and close the sewage discharge channel after the sewage suction is completed, and to control the target sewage tank to exit the suctionable state after the sewage discharge interface is disconnected. In the case where the target waste tank is a negative pressure maintaining waste tank, the state control module is used to connect the target waste tank to the outside and prevent the target waste tank from restoring negative pressure, and the sewage suction control module is used to open the sewage discharge channel after the negative pressure in the target waste tank meets the preset conditions.

9. The train sewage tank suction control system according to claim 8, characterized in that, It also includes at least one of the following modules: The communication module is used to acquire sludge tank configuration information and liquid level information, and to transmit sludge suction control information; The interface status acquisition module is used to acquire the connection status of the sewage discharge interface; Valve position status acquisition module, used to acquire the open / closed position status of drain valve and / or connecting valve; The pressure status acquisition module is used to acquire the negative pressure status inside the negative pressure maintaining type sludge tank; The liquid level status acquisition module is used to acquire the liquid level status of the target sludge tank; The fault protection module is used to stop the suction, close the discharge channel and / or output fault information when an abnormal interface separation, abnormal valve action or communication is detected.

10. A readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the train sewage tank suction control method according to any one of claims 1 to 7.

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