A control system for a bolster replacement vehicle having a back-up power device

Abstract

The application provides a control system of a pillow car with a backup power device, comprising: an engine, which is used for providing power for a walking control system; a backup motor pump, which is connected to the walking control system through a walking backup oil circuit, and is used for providing power for the walking control system when the engine fails; and a battery pack, which is used for providing power for the backup motor pump; the backup motor pump is used for supplying oil to the walking control system, so that the pillow car with a failure can be quickly removed from a track, the operation order of subsequent trains is avoided from being affected, and a safety accident is avoided from being caused, and the backup motor pump meeting the use requirement is calculated through a power selection formula of the backup motor pump.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sleeper changing vehicles, in particular to a sleeper changing vehicle control system with a backup power device. BACKGROUND

[0002] With the continuous improvement of the mechanization level of railway line maintenance, the sleeper changing vehicle (also known as a sleeper changing machine or a sleeper maintenance vehicle) has become an indispensable important equipment in railway maintenance operations. The sleeper changing vehicle usually has autonomous walking ability and can complete tasks such as replacement, recycling and transportation of sleepers on the railway track, greatly improving the operation efficiency and line maintenance quality. For example, Chinese patent document CN213232987U discloses a sleeper changing machine for replacing railway sleepers.

[0003] Once the engine of the sleeper changing vehicle is damaged or fails, the sleeper changing vehicle will lose the self-walking ability and be forced to stay on the railway track, unable to timely evacuate the operation section.

[0004] Due to heavy railway line transportation tasks and high train operation density, the stay of the sleeper changing vehicle on the track will directly cause line congestion, seriously affecting the subsequent train operation order, and even may cause safety accidents. At present, there is still a lack of effective emergency handling mechanism or alternative power scheme for the sudden stop caused by the engine failure of the sleeper changing vehicle, mainly relying on temporary changes in the operation plan or arranging a rescue locomotive for towing, which has a long response cycle and low disposal efficiency, and is difficult to meet the needs of modern railway efficient and safe operation. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a sleeper changing vehicle control system with a backup power device to solve the problems mentioned in the background section.

[0006] The present application is realized by the following technical solutions:

[0007] A sleeper changing vehicle control system with a backup power device, comprising:

[0008] An engine for providing power to a walking control system, further comprising:

[0009] A backup motor pump connected to the walking control system through a walking backup oil circuit, which provides power to the walking control system through the backup motor pump when the engine fails;

[0010] A battery pack providing power to the backup motor pump;

[0011] The power of the backup motor pump satisfies the following formula calculation:

[0012] ;

[0013] wherein, P represents the rated power of the backup motor pump, in KW; Pmin represents the minimum power requirement to meet the corresponding working condition; C represents the base rolling resistance coefficient of the track-laying vehicle on the track bed or ground; C represents the additional resistance coefficient when the track-laying vehicle is off the track; H represents the rail head height of the railway track, in meters; L represents the horizontal distance of wheel rolling when the track-laying vehicle is off the track, in meters; M represents the full load mass of the track-laying vehicle, in kg; g represents the acceleration of gravity, in m / s 2 ; Vmin represents the minimum evacuation speed, in km / h; η represents the transmission efficiency of the walking control system.

[0014] Further, a super capacitor is further included, which provides the backup motor pump with instantaneous power exceeding its rated power , and satisfies , P represents the rated power of the backup motor pump, in KW;

[0015] Under normal circumstances, the backup motor pump is powered by the battery pack;

[0016] Under emergency circumstances, the backup motor pump is powered by the super capacitor.

[0017] Further, the power of the backup motor pump satisfies the following formula calculation:

[0018] ;

[0019] wherein, τ represents the thermal time constant of the backup motor pump; T represents the planned overload duration of the backup motor pump.

[0020] Further, a controller and an oil pressure sensor are further included, the oil pressure sensor is arranged on the walking backup oil circuit; the controller is electrically connected with the engine, the backup motor pump and the oil pressure sensor;

[0021] The controller is configured to, when receiving the start signal of the engine, execute the following self-checking process:

[0022] S1: control to start the backup motor pump, provide power for the backup motor pump through the battery pack, and establish oil pressure;

[0023] S2: reading the oil pressure sensor and comparing with a preset pressure threshold, when the preset pressure threshold is met, the battery pack and the standby motor pump meet the use requirements.

[0024] Further, the controller is further configured to:

[0025] A self-check trigger counter is provided in the internal memory to record the number of engine starts; the self-check trigger counter is incremented each time the controller receives a signal that the engine start is successful;

[0026] When the value of the self-check trigger counter reaches or exceeds a preset threshold N, the controller will automatically perform the self-check process after obtaining the engine start signal;

[0027] After the self-check process is completed, the controller clears the self-check trigger counter and restarts counting.

[0028] Further, the controller is further configured to:

[0029] An absolute timestamp of the last successful completion of the self-check process is recorded in the internal memory;

[0030] Each time the engine start signal is obtained, the interval between the current time and the absolute timestamp of the last self-check process is calculated;

[0031] If the interval reaches or exceeds a preset time threshold T, regardless of the value of the self-check trigger counter, the self-check process is immediately automatically performed in priority;

[0032] After the process is completed, the timestamp of the last self-check process is updated to the current time, and the self-check trigger counter is cleared.

[0033] Further, the standby motor pump is provided with a priority valve after its process, and the priority valve is used to avoid the oil pressure of the travel control system acting on the standby motor pump.

[0034] The beneficial effects of the present application are: a control system of a sleeper changing vehicle with a backup power device, comprising: an engine, the engine is used to provide power for a walking control system; a backup motor pump, the backup motor pump is connected to the walking control system through a walking backup oil circuit, and when the engine fails, the backup motor pump provides power for the walking control system; a battery pack, the battery pack provides power for the backup motor pump; the backup motor pump supplies oil to the walking control system, so that the sleeper changing vehicle can be quickly removed from the track, avoiding affecting the operation order of the subsequent train and causing safety accidents. Compared with the traditional scheme which needs to wait for external rescue vehicles and manually connect, the time consumption is often more than 15 minutes; the present application uses the backup power system of the sleeper changing vehicle to realize "self-rescue", and the removal can be completed within 5 minutes, greatly reducing the rescue time of the sleeper changing vehicle, and saving the operation cost caused by long-term standby of the rescue vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a structural connection diagram of the control system of the sleeper changing vehicle of the present application. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. It should be noted that the description of the embodiments is used to help understand the present application, but does not constitute a limitation on the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as there is no conflict.

[0037] Referring to Figure 1 The control system of the sleeper changing vehicle with a backup power device comprises: an engine, the engine is used to provide power for a walking control system, specifically:

[0038] The walking control system comprises a closed walking pump, a closed hydraulic control valve group, a walking motor and a normally closed brake control valve, wherein:

[0039] The power output shaft of the engine is mechanically connected with the driving shaft of the closed walking pump to drive the closed walking pump to rotate;

[0040] It also comprises a high-pressure circulating oil circuit and a low-pressure circulating oil circuit connected in series with the closed walking pump, the closed hydraulic control valve group and the walking motor, and the closed walking pump converts mechanical energy into hydraulic energy to establish a closed circulation with high and low pressure alternately between the high-pressure circulating oil circuit and the low-pressure circulating oil circuit;

[0041] Further comprising a brake release oil path, the brake release oil path connects the closed traveling pump, the normally closed brake control valve and the traveling motor; when the normally closed brake control valve is in the closed position without control oil pressure, the traveling motor stops running; when the engine is running normally, the control oil output by the closed traveling pump is transmitted to the normally closed brake control valve through the brake release oil path to change the working position of the normally closed brake control valve, so that the traveling motor runs normally.

[0042] The above all belong to the prior art, by starting the engine, the power output shaft drives the closed traveling pump to rotate, the closed traveling pump outputs high-pressure oil -> closed hydraulic control valve group -> traveling motor, forms high pressure / low pressure closed circulation, realizes vehicle traveling.

[0043] At the same time, the closed traveling pump supplies oil to the normally closed brake control valve through the brake release oil path, the spool changes position -> releases the brake of the traveling motor -> the vehicle can normally travel.

[0044] The improvement of the present application is as follows:

[0045] Further comprising a standby power system, the standby power system comprises a standby motor pump, a traveling electromagnetic valve and a pressure reducing valve;

[0046] The standby motor pump is connected with the traveling electromagnetic valve through a traveling standby oil path, the traveling electromagnetic valve is connected with the traveling motor through a first traveling standby branch, so that when the engine fails, the traveling electromagnetic valve outputs hydraulic oil through the standby motor pump, the traveling electromagnetic valve controls the on-off, flow or direction of the hydraulic oil path to drive the traveling motor to complete the traveling action;

[0047] The traveling electromagnetic valve is connected with the pressure reducing valve through a second traveling standby branch, the pressure reducing valve is connected with the normally closed brake control valve, so that when the engine fails, the pressure reducing valve reduces the oil pressure input by the traveling electromagnetic valve to meet the oil pressure required by the normally closed brake control valve to complete the release of the restriction on the traveling motor.

[0048] The standby motor pump supplies oil to the traveling standby oil path, the traveling electromagnetic valve is connected with the pressure reducing valve through the second traveling standby branch, the pressure reducing valve is connected with the normally closed brake control valve, the pressure reducing valve reduces the oil pressure input by the traveling electromagnetic valve to meet the oil pressure required by the normally closed brake control valve to complete the release of the restriction on the traveling motor.

[0049] The standby motor pump supplies oil to the traveling standby oil path, the traveling electromagnetic valve is connected with the traveling motor through the first traveling standby branch, the traveling electromagnetic valve controls the on-off, flow or direction of the hydraulic oil path to drive the traveling motor to complete the traveling action.

[0050] Through the standby motor pump, oil is supplied to the walking control system, so that the fault sleeper changing vehicle can be quickly removed from the track, the subsequent train operation order is avoided, and a safety accident is avoided. Compared with the traditional scheme which needs to wait for external rescue vehicles and manually hang, the time consumption is often more than 15 minutes; the present application uses the standby power system of the sleeper changing vehicle to realize "self-rescue", and the removal can be completed within 5 minutes, so that the waiting time of the sleeper changing vehicle for rescue is greatly reduced, and the operation cost caused by long-term standby of the rescue vehicle is avoided.

[0051] Specifically, the first walking standby branch is two branches, and the two branches are connected with the high-pressure circulating oil circuit and the low-pressure circulating oil circuit through two first three-way valves; similarly, the brake release oil circuit and the second walking standby branch are connected through a second three-way valve. When the engine is damaged, the switching oil circuit of the first three-way valve and the second three-way valve is switched, so that the sleeper changing vehicle is driven to walk by the standby motor pump.

[0052] The power selection of the standby motor pump needs to consider many factors, which are as follows:

[0053] First, the emergency performance requirement needs to ensure that it can provide power for the core action of the sleeper changing vehicle in the emergency scene, including meeting the basic functions of "walking, steering and braking", and ensuring that the equipment can be safely removed or complete the key operation in an emergency;

[0054] Second, the space and weight limitation, since the installation space of the engine compartment is very compact, the power of the standby motor pump needs to be balanced with the compartment space and the overall vehicle weight, so as to avoid the equipment size / weight exceeding the standard due to high power, and to adapt to the existing installation layout;

[0055] Third, the cost control requirement, the power of the standby motor pump is positively correlated with its price, the higher the power, the higher the procurement cost, which needs to consider economy on the premise of meeting performance.

[0056] Therefore, the power selection of the standby motor pump needs to achieve "double adaptation": it needs to meet the power use needs in the emergency scene, and also needs to meet the space / weight constraints and price limitations, so as to balance performance, layout and cost, so as to meet the use demand of the standby motor pump through the following formula:

[0057] ;

[0058] Among them, represents the rated power of the standby motor pump, unit KW; represents the minimum power demand meeting the corresponding working condition; represents the basic rolling resistance coefficient of the sleeper changing vehicle on the track bed or the ground; represents the additional resistance coefficient of the sleeper changing vehicle when it is off the track; The rail head height of the railway track, in meters; The horizontal distance of wheel rolling when the sleeper changing vehicle is off the track, in meters; The full load mass of the sleeper changing vehicle, in kg; The gravitational acceleration, in m / s 2 ; The minimum evacuation speed, in km / h; The transmission efficiency of the walking control system.

[0059] As a further improvement, a super capacitor is further included, which provides the standby motor pump with instantaneous power exceeding its rated power , and satisfies , The rated power of the standby motor pump, in KW;

[0060] Under normal circumstances, the battery pack supplies power to the standby motor pump; in emergency situations, the super capacitor supplies power to the standby motor pump.

[0061] Under normal circumstances, the battery pack supplies power to the standby motor pump, which can stably meet the walking control system; in emergency situations, including excessive slope, excessive track height, soft and collapsed track bed due to rain, long-term rolling, etc., the battery pack is insufficient when driving, and the sleeper changing vehicle has a risk of stalling, and the super capacitor needs to provide instantaneous power to help escape. The super capacitor can quickly provide instantaneous power exceeding 1.5 times the conventional total power, which is beneficial to the rapid driving of the engineering vehicle out of the dangerous area.

[0062] The power of the standby motor pump satisfies the following formula calculation:

[0063] ;

[0064] Wherein, The thermal time constant of the standby motor pump; The planned overload duration of the standby motor pump.

[0065] By closely combining the thermal time constant of the standby motor pump , the upper limit of the planned overload duration is quantified, which can effectively avoid damage of the standby motor pump due to excessive overload time and thermal accumulation exceeding the safety range, greatly improving the reliability and service life of the standby power system under emergency overload working conditions, and ensuring the thermal stability of the motor when outputting instantaneous high power.

[0066] As an extension of the above embodiment, since the engine failure of the pillow changing vehicle belongs to a small probability event, there is a pain point that the standby power system needs to be used for a long time and may be invalid. In order to ensure the absolute reliability of the emergency function, the application realizes the automatic self-checking of the standby power system through the following settings, specifically:

[0067] Referring to Figure 1 It also includes a controller and an oil pressure sensor, and the oil pressure sensor is arranged on the walking standby oil circuit; the controller is electrically connected with the engine, the standby motor pump and the oil pressure sensor;

[0068] The controller is configured to execute the following self-checking process when receiving the start signal of the engine:

[0069] S1: control to start the standby motor pump, provide power for the standby motor pump through the battery pack, and establish oil pressure;

[0070] S2: read the oil pressure sensor and compare with the preset pressure threshold value, when the preset pressure threshold value is met, the battery pack and the standby motor pump meet the use requirement.

[0071] In step S1, it is verified that the battery pack has sufficient power reserve and stable power output, and the electrical connection and mechanical operation function of the standby motor pump are normal, which can successfully convert electrical energy into hydraulic energy.

[0072] In step S2, if the oil pressure sensor exceeds the preset pressure threshold value, it is directly proved that: first, the output performance of the standby motor pump is normal, which can establish effective pressure.

[0073] As an extension of the above embodiment, if the controller receives the start signal every time, the self-checking process of the standby power system will cause the following problems:

[0074] First, the user experience and operation efficiency problem: the complete self-checking process needs several seconds to complete pressure building, testing and resetting. Each time the vehicle is started, the driver needs to wait until the self-checking is completed before operating, which causes unnecessary start delay and breaks the continuity of operation. Especially in high-intensity operations that require frequent starting and stopping of vehicles, this waiting time will significantly reduce the operation efficiency and cause the driver's dissatisfaction.

[0075] Secondly, too frequent self-checking process weakens the core ability of emergency support: the fundamental mission of the standby power system is to provide emergency energy when the engine fails. The power reserve of its battery pack is a limited valuable resource. Each time the self-checking process drives the standby motor pump to idle and operates the electromagnetic valve to reverse, it will substantially consume the battery pack power. If the vehicle is started every time, it is equivalent to continuously wasting the "life-saving electricity" reserved for emergency situations under non-emergency conditions. It may lead to the battery pack power being partially depleted due to frequent self-checking when a real failure occurs, and the standby system cannot support the required escape or rescue action, making the standby system useless.

[0076] Therefore, in view of the above technical problems, the present application also includes the following operations:

[0077] The controller is further configured to:

[0078] A self-check trigger counter is provided in the internal memory for recording the number of engine starts; each time the controller receives a signal that the engine starts successfully, the self-check trigger counter is incremented;

[0079] When the value of the self-check trigger counter reaches or exceeds a preset threshold N, the controller will automatically perform the self-checking process of the standby power system after obtaining the start signal;

[0080] After the self-checking process is completed, the controller clears the self-check trigger counter and starts counting again.

[0081] The above mechanism can associate the frequency of self-checking with the actual use intensity of the vehicle, ensuring that the standby power system can be periodically and effectively verified, and completely avoiding the problems of component life loss and energy waste caused by excessive detection, fundamentally solving the contradiction between "detection necessity" and "system loss".

[0082] To further ensure the reliability of the replacement pillow car after long-term idle, the self-check trigger strategy of the present system also introduces a forced detection mechanism in the time dimension. The internal memory of the controller will persistently store the absolute time stamp of the last successful completion of the self-checking process. The controller is connected to a real-time clock circuit, which provides a weak maintenance current from the storage battery after the vehicle is completely turned off, to ensure uninterrupted and lossless timing.

[0083] The controller is further configured to:

[0084] The absolute time stamp of the last successful completion of the self-checking process is recorded in the internal memory;

[0085] Whenever a start signal is obtained, the interval between the current time and the last self-check time stamp is calculated;

[0086] If the interval days reach or exceed a preset time threshold T (for example, T=30 days), the self-checking process of the backup power system is automatically performed immediately regardless of the value of the self-checking trigger counter;

[0087] After the process is completed, the last self-checking timestamp is updated to the current time, and the self-checking trigger counter is cleared.

[0088] The backup motor pump is provided with a priority valve after its working procedure, and the priority valve is used for pressure relief of the tool backup oil circuit and the traveling backup oil circuit. Since the power of the backup motor pump is much smaller than that of the engine, the backup motor pump is more sensitive to overload and pressure impact. At the moment when the backup system is started, high pressure is maintained in the oil circuit due to the operation of the engine, and then the backup motor pump is switched to work after the engine is damaged, and the backup motor pump will face huge starting torque and impact load.

[0089] Therefore, when the backup motor pump works, the hydraulic oil flows to the subsequent oil circuit through the priority valve, and the outlet pressure of the backup motor pump is maintained at a low level, so that the high-pressure oil can flow back to the oil tank through the pressure relief channel, avoiding the high-pressure oil acting on the backup motor pump and causing the backup motor pump to be burned out.

[0090] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0091] In the description of the present application, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features.

[0092] The above description is only the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A control system for a gondola car with a backup power device, comprising: an engine for providing power for a walking control system, characterized in that it further comprises: a backup motor pump connected to the walking control system through a walking backup oil circuit, and providing power for the walking control system through the backup motor pump when the engine fails; a battery pack providing power for the backup motor pump; the power of the backup motor pump satisfies the following formula calculation: ； wherein, represents the rated power of the standby motor pump, unit KW; represents the minimum power requirement meeting the corresponding working condition; represents the base rolling resistance coefficient of the track panel car on the track bed or ground; represents the additional resistance coefficient when the track panel car is off the track; represents the rail head height of the railway track, unit meter; represents the horizontal distance of wheel rolling when the track panel car is off the track, unit meter; represents the full load mass of the track panel car, unit kg; represents the acceleration of gravity, unit m / s 2 ; represents the minimum evacuation speed, unit km / h; represents the transmission efficiency of the walking control system; Also included is a super capacitor that provides the backup motor pump with instantaneous power beyond its rated power , and satisfies , represents the rated power of the backup motor pump, in KW under normal circumstances, the backup motor pump is powered by the battery pack; in an emergency, the backup motor pump is powered by the super capacitor; the power of the backup motor pump satisfies the following formula calculation: ； wherein, represents a thermal time constant of the backup motor pump; represents a planned overload duration of the backup motor pump.

2. A control system for a pillow car having a backup power unit as defined in claim 1, wherein: further comprising a controller and an oil pressure sensor, the oil pressure sensor is arranged in the walking backup oil circuit; the controller is electrically connected with the engine, the backup motor pump and the oil pressure sensor; the controller is configured to perform the following self-checking process when receiving the start signal of the engine: S1: control to start the backup motor pump, provide power for the backup motor pump through the battery pack, and establish oil pressure; S2: read the oil pressure sensor and compare with the preset pressure threshold value, when the preset pressure threshold value is met, the battery pack and the backup motor pump meet the use requirement.

3. A control system for a gondola car having a backup power unit as defined in claim 2, wherein: the controller is further configured to: a self-checking trigger counter is provided in the internal memory for recording the number of engine starts; the self-checking trigger counter is incremented each time the controller receives a signal that the engine starts successfully; when the value of the self-checking trigger counter reaches or exceeds a preset threshold N, the controller will automatically execute the self-checking process after obtaining the engine start signal; after the completion of the self-checking process, the controller clears the self-checking trigger counter and restarts the counting.

4. A control system for a pillow switching vehicle having a backup power unit as defined in claim 3, wherein: the controller is further configured to: record the absolute time stamp of the last successful completion of the self-checking process in the internal memory; calculate the interval days between the current time and the absolute time stamp of the last self-checking process each time the engine start signal is obtained; if the interval days reach or exceed a preset time threshold T, the self-checking process will be automatically executed immediately regardless of the value of the self-checking trigger counter; after the completion of the process, update the time stamp of the last self-checking process to the current time and clear the self-checking trigger counter.

5. The control system for a pillow switching car having a backup power unit according to claim 1, wherein: the backup motor pump is provided with a priority valve after its process, the priority valve is used to avoid the oil pressure of the walking control system acting on the backup motor pump.

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