Pantograph rising time detection method and device

Abstract

The application discloses a pantograph ascending time detection method and device, comprising the following steps: S1, judging whether the current pantograph network voltage value meets the condition: the pantograph network voltage value is greater than the first set voltage value and the pantograph network voltage value rising rate is greater than the set rate value; if yes, the current time is determined as the pantograph ascending start time; S2, when the current pantograph network voltage value is greater than the second set voltage value, the current time is determined as the pantograph ascending completion time; S3, the pantograph ascending time is obtained by subtracting the pantograph ascending start time from the pantograph ascending completion time. Compared with the prior art, the application has lower cost than the prior pantograph ascending time detection method based on image recognition. In addition, the pantograph ascending time is not different due to different catenary heights, and a unified standard can be set for the normal pantograph ascending time, so that whether the pantograph normally ascends can be more accurately judged.

Description

Technical Field

[0001] This invention relates to the field of rail transit technology, specifically to a method and device for detecting the pantograph raising time. Background Technology

[0002] The pantograph raising time is a crucial indicator of its health. Currently, most pantograph raising time checks rely on manual inspection within the depot. Railway workers use timing devices to test whether the pantograph is functioning correctly. This method is inefficient and prone to inaccurate results due to human error in readings. Some domestic methods rely on specialized testing devices that require removing the pantograph from the locomotive roof and mounting it on these devices for raising time measurement. This offline testing method, requiring pantograph removal, cannot meet practical needs.

[0003] With the development of computer vision technology, some studies have also focused on pantograph image recognition methods to detect pantograph raising time. For example, Chinese invention patent application CN113256723A discloses an automatic detection method for pantograph raising and lowering time and pantograph head displacement curve. This method adds marker points to the existing pantograph and uses machine vision algorithms to monitor these marker points in real time to obtain the pantograph raising and lowering time. Its disadvantages are: firstly, the above-mentioned pantograph raising time detection method requires high algorithm accuracy and video clarity, resulting in high costs; secondly, due to the inconsistent height of the overhead contact line, even if the pantograph is raised normally, the actual raising time will vary depending on the raising height, making it difficult to set a unified standard for the normal raising time. Summary of the Invention

[0004] This invention provides a method and apparatus for detecting the pantograph raising time. One objective is to solve the technical problem that the existing technology requires high accuracy of the algorithm and clarity of the video, resulting in high costs. Another objective is to solve the technical problem that it is difficult to set a unified standard for the normal pantograph raising time.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] On the one hand, a method for detecting the pantograph raising time is provided, comprising the following steps:

[0007] S1. Determine if the current pantograph voltage value meets the following conditions: the pantograph voltage value is greater than the first set voltage value and the pantograph voltage value rise rate is greater than the set rate value; if so, determine the current time as the start time of pantograph raising.

[0008] S2. When the current pantograph voltage is greater than the second set voltage value, the current time is determined as the time when the pantograph raising is completed.

[0009] S3. Subtract the starting time of raising the pantograph from the completion time of raising the pantograph to obtain the raising time of the pantograph.

[0010] Among them, the first set voltage value and the second set voltage value satisfy the following conditions: Un < Up1 < Us < Up2; where Un is the pantograph network voltage value in the lowering state, Up1 is the first set voltage value, Us is the pantograph network voltage value when the pressure switch feeds back a high level, and Up2 is the second set voltage value.

[0011] The pantograph is an articulated mechanical component, and its raising and lowering are directly controlled by an airbag device. After the pantograph head rises, it contacts the catenary wire, collects current from the catenary, and transmits it to the vehicle through the roof bus for use by the locomotive. Generally, equipment such as pantograph solenoid valves, pressure switches, and network voltage sensors are installed on the vehicle to monitor the state of the pantograph.

[0012] The raising process of the pantograph is as follows: When the driver operates the raising key, the train control system controls the pantograph solenoid valve to be energized, and compressed air enters the airbag device to raise the pantograph. When the raising air pressure reaches the preset value, the pressure switch feeds back a high level, and the network voltage sensor real-time collects the voltage at the pantograph head, that is, the above-mentioned pantograph network voltage value. When the pantograph head contacts the catenary, the voltage collected by the network voltage sensor is the catenary network voltage value, that is, the pantograph network voltage value is equal to the catenary network voltage value.

[0013] By using the existing detection equipment of the pantograph, the present invention can detect the raising time of the pantograph when the pantograph is normally raised without disassembling the pantograph or adding additional equipment. Compared with the method for detecting the raising time of the pantograph based on image recognition, the cost of the present invention is lower. Secondly, in the traditional sense, the starting time of raising the pantograph refers to the moment when the pantograph starts to rise, while the present invention redefines the starting time of raising the pantograph as the moment when the pantograph approaches the catenary to generate an arc (at this time, the pantograph network voltage value is greater than the first set voltage value and the rising rate of the pantograph network voltage value is greater than the set rate value). Since the distance between the pantograph and the catenary is relatively fixed when the pantograph approaches the catenary to generate an arc, the raising time will not vary due to different catenary heights, and a unified standard can be set for the normal raising duration, so that it can be more accurately determined whether the pantograph is normally raised.

[0014] It should be noted that if only the condition that the pantograph voltage is greater than the first set voltage value is met, the detected induced voltage in the pantograph-unraised state will vary under different line conditions due to differences in the distance between the pantograph and the contact wire or the real-time voltage of the contact wire, potentially exceeding the first set voltage value and causing misjudgment. If only the condition that the voltage rise rate is greater than the set rate is met, during maintenance in the depot, if the contact wire is suddenly energized, the voltage detected by the pantograph will suddenly increase from 0V to the induced voltage value, possibly causing misjudgment. Therefore, only when both conditions are met simultaneously can the start time of pantograph raising be correctly identified.

[0015] In some embodiments, when the current pantograph grid voltage does not meet the conditions but the pressure switch feedback is high, the current time is determined as the start time for pantograph raising; the pressure switch feedback is high when the pantograph raising air pressure reaches a preset pressure value. It should be noted that the preset pressure value can be flexibly set according to actual conditions, and the standard normal pantograph raising time is also adjusted accordingly based on the preset pressure value. The pantograph raising start time determined based on the pantograph grid voltage value and the pantograph raising start time determined based on the pressure switch can be the same or different. If they are different, only the respective standard normal pantograph raising time needs to be set accordingly.

[0016] In some embodiments, before step S1, the process may include: if the pantograph raising condition is not met or the pantograph malfunctions, the process ends; if the pantograph raising condition is met and the pantograph is not malfunctioning, and the duration of the action signal emitted by the pantograph solenoid valve exceeds a set time, the process proceeds to step S1.

[0017] The pantograph solenoid valve sends an action signal when the pantograph lifting switch is turned on.

[0018] In some embodiments, after the pantograph raising time detection begins, if the pantograph voltage value is outside the normal range and persists for a certain period of time, the pantograph raising time detection is terminated.

[0019] In another aspect, a pantograph raising time detection device is provided, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above method.

[0020] In another aspect, a computer-readable storage medium is provided that stores a computer program / instructions thereon, which, when executed by a processor, implement the steps of the above-described method.

[0021] In another aspect, a computer program product is provided, including a computer program / instructions that, when executed by a processor, implement the steps of the above-described method.

[0022] This invention has at least the following technical effects or advantages: By utilizing existing pantograph solenoid valves, pressure switches, and contact network voltage sensors, the pantograph raising time can be detected during normal pantograph raising without disassembling the pantograph or adding additional equipment. Compared to existing pantograph raising time detection methods based on pantograph image recognition, this invention has lower costs. Secondly, the raising time does not vary with the height of the contact network, allowing for a unified standard to be set for normal raising time, thus enabling more accurate determination of whether the pantograph is raising normally. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating a pantograph raising time detection method according to an embodiment of the present invention. Detailed Implementation

[0024] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0025] Example 1

[0026] See Figure 1 This paper presents a method for detecting the pantograph raising time, utilizing existing pantograph solenoid valves, pressure switches, and grid voltage sensors found on locomotives. The pantograph on existing locomotives is an articulated mechanical component, and its raising and lowering are directly controlled by an air spring device. After the pantograph head rises, it contacts the contact wire, collects current from the contact wire, and transmits it to the locomotive through the roof busbar for locomotive use. Generally, locomotives are equipped with pantograph solenoid valves, pressure switches, grid voltage sensors, and other equipment to monitor the pantograph's status.

[0027] The pantograph raising process on existing locomotives is as follows: When the driver operates the pantograph raising lever, the train control system controls the pantograph solenoid valve to be energized, and compressed air enters the airbag device to raise the pantograph. When the pantograph raising air pressure reaches the preset value, the pressure switch feeds back a high level, and the grid voltage sensor collects the voltage at the pantograph head in real time. When the pantograph head contacts the contact wire, the collected voltage is the contact wire grid voltage value.

[0028] The method includes the following steps:

[0029] S1. Determine whether the current pantograph voltage value meets the following conditions: the pantograph voltage value is greater than the first set voltage value and the pantograph voltage value rise rate is greater than the set rate value; if yes, then determine that the current time is the start time of pantograph raising; if no, then further determine whether the pressure switch feedback is high level; if the pressure switch feedback is high level, then determine that the current time is the start time of pantograph raising.

[0030] S2. When the current pantograph voltage is greater than the second set voltage value, the current time is determined as the time when the pantograph raising is completed.

[0031] S3. Subtract the moment when the pantograph rising is completed from the moment when the pantograph rising starts to obtain the pantograph rising time;

[0032] Among them, the pressure switch feeds back a high level when the pantograph rising air pressure reaches the preset pressure value; the first set voltage value and the second set voltage value satisfy the following conditions: Un < Up1 < Us < Up2; where Un is the pantograph network voltage value in the pantograph lowering state, Up1 is the first set voltage value, Us is the pantograph network voltage value when the pressure switch feeds back a high level, and Up2 is the second set voltage value. Specifically, the first set voltage value Up1 can be set to 2 kV, the set rate value can be set to 6 V / s, and the second set voltage value Up2 can be set to 17 kV.

[0033] As a preferred solution, before step S1, it further includes: if the pantograph rising condition is not satisfied or the pantograph is faulty, then end; if the pantograph rising condition is satisfied and the pantograph is not faulty, and the duration of the action signal sent by the pantograph solenoid valve exceeds the set time (such as 200 ms), then enter S1; where the pantograph solenoid valve sends an action signal when the pantograph rising key switch is turned on.

[0034] As a preferred solution, after starting the detection of the pantograph rising time, if the pantograph network voltage value is not within the normal range (such as less than 0 V or greater than 35 kV) and lasts for a certain time, then it is determined that the network voltage sensor is faulty and the detection of the pantograph rising time is exited.

[0035] Embodiment 2

[0036] A device for detecting the pantograph rising time of a pantograph includes a memory, a processor, and a computer program stored on the memory. The processor executes the computer program to implement the steps of the above method.

[0037] Embodiment 3

[0038] A computer-readable storage medium has a computer program / instructions stored thereon. When the computer program / instructions are executed by a processor, the steps of the above method are implemented.

[0039] Embodiment 4

[0040] A computer program product includes a computer program / instructions. When the computer program / instructions are executed by a processor, the steps of the above method are implemented. A computer program product includes a computer program / instructions. When the computer program / instructions are executed by a processor, the steps of the above method are implemented.

[0041] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0042] Similarly, it should be understood that, in order to streamline this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed invention requires more features than expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of the invention.

[0043] Those skilled in the art will understand that the modules, units, or groups of devices in the examples disclosed herein can be arranged in the device as described in this embodiment, or alternatively, can be located in one or more devices different from the device in this example. The modules in the foregoing examples can be combined into a single module or further divided into multiple sub-modules.

[0044] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or groups in the embodiments can be combined into a single module, unit, or group, and further, they can be divided into multiple sub-modules, sub-units, or sub-groups. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0045] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are meant to be within the scope of the invention and form different embodiments.

[0046] Furthermore, some of the embodiments described herein are methods or combinations of method elements that can be implemented by a processor of a computer system or by other means of performing the functions. Therefore, a processor having the necessary instructions for implementing the methods or method elements forms means for implementing the methods or method elements. Furthermore, the elements described herein in the apparatus embodiments are examples of means for implementing the functions performed by elements for the purposes of carrying out the invention.

[0047] The various techniques described herein can be implemented in combination with hardware or software, or a combination thereof. Thus, the methods and apparatus of the present invention, or certain aspects or portions thereof, can take the form of program code (i.e., instructions) embedded in a tangible medium, such as a floppy disk, CD-ROM, hard disk, or any other machine-readable storage medium, wherein when the program is loaded into and executed by a machine such as a computer, the machine becomes an apparatus for practicing the present invention.

[0048] When the program code is executed on a programmable computer, the computing device generally includes a processor, a processor-readable storage medium (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device. The memory is configured to store program code; the processor is configured to execute the method of the present invention according to instructions in the program code stored in the memory.

[0049] By way of example, and not limitation, computer-readable media include computer storage media and communication media. Computer storage media stores information such as computer-readable instructions, data structures, program modules, or other data. Communication media generally embodies computer-readable instructions, data structures, program modules, or other data in the form of modulated data signals such as carrier waves or other transmission mechanisms, and includes any information delivery medium. Any combination of the above is also included within the scope of computer-readable media.

[0050] As used herein, unless otherwise specified, the use of ordinal numbers such as “first,” “second,” “third,” etc., to describe ordinary objects merely indicates different instances of similar objects and is not intended to imply that the objects being described must have a given order in time, space, ordering, or any other manner.

[0051] Although the invention has been described with reference to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and instructional purposes, and not for the purpose of interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the invention is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

[0052] Finally, it should be noted that this invention does not explain in detail the common knowledge recognized by those skilled in the art. The above description is only a specific embodiment of this invention and is not intended to limit this invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

Claims

1. A method for detecting the pantograph raising time, characterized in that, The method includes the following steps: S1. Determine whether the current pantograph network voltage value meets the conditions: the pantograph network voltage value is greater than the first set voltage value and the rising rate of the pantograph network voltage value is greater than the set rate value; if so, determine the current moment as the starting moment of raising the pantograph; S2. When the current pantograph network voltage value is greater than the second set voltage value, determine the current moment as the completion moment of raising the pantograph; S3. Subtract the starting moment of raising the pantograph from the completion moment of raising the pantograph to obtain the raising time; Wherein, the first set voltage value and the second set voltage value meet the following conditions: Un < Up1 < Us < Up2; where Un is the pantograph network voltage value in the lowering state, Up1 is the first set voltage value, Us is the pantograph network voltage value when the pressure switch feeds back a high level, and Up2 is the second set voltage value.

2. The pantograph raising time detection method according to claim 1, characterized in that: When the current pantograph network voltage value does not meet the conditions but the pressure switch feeds back a high level, determine the current moment as the starting moment of raising the pantograph; the pressure switch feeds back a high level when the raising air pressure reaches the preset pressure value.

3. The pantograph raising time detection method according to claim 1 or 2, characterized in that, Before step S1, it further includes: if the raising conditions are not met or the pantograph fails, end; if the raising conditions are met and the pantograph is fault-free, and the duration of the action signal sent by the pantograph solenoid valve exceeds the set time, enter S1; Wherein, the pantograph solenoid valve sends an action signal when the raising key switch is turned on.

4. The pantograph raising time detection method according to claim 3, characterized in that: After the detection of the raising time starts, if the pantograph network voltage value is not within the normal range and lasts for a certain time, exit the detection of the raising time.

5. A pantograph raising time detection device, comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the steps of the method according to any one of claims 1-4.

6. A computer-readable storage medium having a computer program / instructions stored thereon, characterized in that, When the computer program / instructions are executed by the processor, the steps of the method according to any one of claims 1-4 are implemented.

7. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, the steps of the method according to any one of claims 1-4 are implemented.

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