A freight train operation control method based on LKJ

Abstract

The present invention provides a freight train operation control method based on a train operation monitoring and recording device (LKJ). By refining LKJ control data in small amounts and optimizing the LKJ control method, the problems of unexpected braking, over-advancing, etc. caused by the freight train during the operation of the hook pressing operation and the permissive signal control are solved, the effective control of the hook pressing operation is realized, the occurrence of unexpected braking during the hook pressing operation is prevented, the optimization and subdivision of the permissive signal control is realized, the over-advancing signal machine is prevented, the potential risk of safety accidents during the operation of the freight train is completely avoided, and the availability and safety of the LKJ are improved.

Description

Technical Field

[0001] The present invention relates to the field of train control in the railway industry, and in particular to a freight train operation control method based on a train operation monitoring and recording device (LKJ). Background Art

[0002] LKJ is a train speed control system that aims to prevent trains from overrunning signals, overspeeding and assisting drivers in improving their operating capabilities. It is the train central equipment for railway informatization. With the rapid development of China's railways, some new demands have been continuously put forward, prompting LKJ to continuously optimize and upgrade its control logic and control functions in order to further optimize and improve its role in ensuring railway transportation safety.

[0003] At present, in order to solve the problem of difficulty in starting due to heavy loads, freight trains usually adopt special control methods when starting the train and when reducing unnecessary stops during operation: (1) After stopping at the station, the driver usually controls the train to run in the reverse direction to appropriately compress the coupler when starting, thereby reducing the traction resistance of the locomotive and allowing the train to start; (2) When the train encounters a stop signal on an uphill ramp in an automatic block section, in order to avoid the problem of difficulty in starting after stopping, a permissive signal is installed on the through signal, so that LKJ can monitor the freight train passing the signal with a fixed speed limit of 20 km / h in the current operating scenario.

[0004] When the above control method is used to monitor the operation of freight trains, the following defects exist: (1) When the hook pressing operation is performed, the locomotive runs in the reverse direction. At this time, the locomotive signal cannot receive the track circuit signal, and the locomotive signal outputs no code H. According to the requirements of the "LKJ Control Mode Setting Specification", when LKJ receives the H code and the HU code turns to no code, it will output emergency braking, which seriously affects the normal operation of the driver. (2) When performing permissive signal control, if the locomotive signal information is HU code or H code, it is inconsistent with the permissive signal control method, and there is a possibility that the on-board and ground data may not match. If the parking control is released, there is a risk of over-running the signal. Summary of the invention

[0005] The purpose of the present invention is to solve the defects of the above-mentioned existing control methods and provide a freight train operation control method based on a train operation monitoring and recording device (LKJ). The present invention optimizes the control method of LKJ, solves the problems of unexpected braking, over-advancing, etc. caused by the freight train during the operation of the hook pressing operation and the permissive signal control, realizes effective control of the hook pressing operation, and prevents the occurrence of unexpected braking during the hook pressing operation; realizes the optimized subdivision of the permissive signal control, and prevents over-advancing signal machines.

[0006] The present invention provides a freight train operation control method based on LKJ, which realizes effective control of hook pressing operation and prevents the occurrence of unexpected braking during the hook pressing operation;

[0007] The steps of this method are as follows:

[0008] When the train starts to press the hook,

[0009] 1) LKJ detects that the handle direction is opposite to the direction when the train was aligned with the mark, and allows the train to reverse and compress the coupler; when the reverse distance does not exceed the allowable reverse distance D, the locomotive signal HU turns to no code and does not output emergency braking; when the reverse distance exceeds the allowable reverse distance, LKJ outputs emergency braking;

[0010] 2) The remaining distance shown on the screen decreases according to the distance traveled when the train is reversing, which is convenient for the driver to observe.

[0011] The method also solves the problems of unexpected braking and over-advancing caused by freight trains during special operations. When a freight train runs in an automatic block section and a stop signal is displayed by a passing signal, the permissive signal control of LKJ is subdivided according to the locomotive signal code position.

[0012] The present invention has the following technical effects: the method does not require the user to add additional submission data, but only needs to refine the control data in a small amount when compiling the data; for the LKJ control software, the changes and modifications are also limited to the scope of independent functions, and the feasibility is relatively high. It can promote the combination of the control mode of LKJ with the actual needs of on-site operations, solve the risks that may exist in the current LKJ control mode, and improve the availability and safety of LKJ. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Control flow chart for preventing unexpected braking during train hook pressing operation;

[0014] Figure 2 A control flow chart for adding code position judgment to allow signal control. DETAILED DESCRIPTION

[0015] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, without departing from the inventive concept, several variations and improvements may be made, which all belong to the protection scope of the present invention.

[0016] When a freight train is carrying out a transportation task, after stopping at a station, when it starts, because the train is very heavy, the traction resistance at the start is very large, and the traction force of the front of the train is limited. It is easy for the locomotive and the following car to break the hook due to insufficient power to pull the entire train. The existing control method is that the driver operates the locomotive to reverse, and by appropriately compressing the coupler, each coupler is in a relaxed or compressed state, and then starts forward. At this time, when pulling the first car, the couplers of the first and second cars are in a relaxed state, and the resistance of the cars after the second car will hardly act on the locomotive, so the locomotive will start easily. By analogy, the whole process can be regarded as the locomotive pulling the cars one by one.

[0017] The "hook pressing" operation can start the train section by section, thus greatly reducing the resistance during starting and ensuring the acceleration process of the front of the train. During this process, the train will have a large displacement backwards, and the more forward the carriage is, the greater the displacement will be, resulting in the locomotive signal not receiving the track circuit signal, and the locomotive signal outputting no code H. According to the requirements of the "LKJ Control Mode Setting Specification", when LKJ receives the H code and the HU code turns to no code, it will output emergency braking, which seriously affects the normal operation of the driver.

[0018] During the operation of freight trains, in the automatic block section, when a freight train encounters a stop signal displayed by a passing signal on an uphill road, it is easy to have difficulty starting after stopping, and even disrupt the railway operation order due to requests for rescue, affecting the efficiency of railway transportation. The existing control method is that if a passing signal is set at a location where it is difficult for a freight train to start after stopping on an uphill road, a permissive signal is installed on the passing signal. According to the requirements of the "LKJ Control Mode Setting Specification": When a freight train encounters a locomotive signal information of a stop signal before a passing signal with a permissive signal installed in the on-board data, LKJ calculates and generates a control mode curve with the signal as the control target point, and determines 20km / h as the fixed mode speed limit value to monitor the train passing the signal.

[0019] In the existing control mode of LKJ, if a stop signal is received before the permissive signal, including HB code, HU code, H code, and stop signal without code but logical judgment, it will be opened according to the permissive signal and the permissive signal stop control will be released. However, there are differences between the relevant regulations in the "Railway Technical Management Regulations (Conventional Railway Part)" (hereinafter referred to as the "Technical Regulations") and the existing permissive signal control method of LKJ, as follows:

[0020] According to Article 435 of the Technical Regulations, the locomotive signal is half yellow and half red flashing, indicating that the approaching train, the train approaching route or the train approaching route signal displays the guidance signal or the passing signal displays the permission signal. According to Article 9.0.7 of the Railway Signal Design Specifications, in the automatic block section, when the passing signal displays the permission signal, the track circuit should send the HB code.

[0021] Therefore, only when LKJ receives the HB code of the locomotive signal can the ground open permission signal be determined. The current LKJ permission signal control method believes that when a stop signal including the HB code is received, the ground open permission signal can be determined, which is larger than the range of determining the permission signal stipulated in the Technical Regulations, and there are safety hazards.

[0022] According to the locomotive signal code position, the permissive signal control is analyzed separately: (1) When the locomotive signal has no code but is logically judged to be a stop signal, considering Article 316 of the "Technical Regulations", when the permissive signal light is off, the driver is still allowed to pass the permissive signal after confirming that the signal is equipped with a permissive signal. The control of LKJ before the permissive signal can allow the stop control to be automatically released when the track circuit has no code and the logic judges it as a stop signal. (2) If the locomotive signal information is HU code or H code, it is inconsistent with the rule that HB code is a permissive signal stipulated in the "Technical Regulations". If the stop control is released according to the "LKJ Control Mode Setting Specifications", there is a risk of over-running the signal.

[0023] In view of the defects of the above-mentioned LKJ control mode, the present invention solves the problems of unexpected braking, over-advancing and so on caused by the freight train performing the above-mentioned special operations during operation by optimizing the control method of LKJ, realizes effective control of the hook pressing operation, prevents the occurrence of unexpected braking during the hook pressing operation, and improves the LKJ's assistance to the driver; realizes the optimized subdivision of the permissible signal control and prevents over-advancing signals.

[0024] The LKJ-based freight train operation control method of the present invention comprises the following implementation steps:

[0025] When the train starts to press the hook:

[0026] 1) LKJ detects that the direction of the handle is opposite to the direction when the train is started, allowing the train to reverse and compress the coupler. When the reverse distance does not exceed the allowable reverse distance, the locomotive signal HU turns to no code and does not output emergency braking; when the reverse distance exceeds the allowable reverse distance, LKJ outputs emergency braking.

[0027] The allowed distance for regression is calculated by the following formula and rounded up:

[0028]

[0029] In formula (1), n ​​is the number of vehicles; l is the coupling clearance, in mm.

[0030] The number of vehicles n is determined according to the set parameters input by the driver, and the coupling gap l can be selected according to the coupler model.

[0031] 2) The remaining distance shown on the screen should be reduced according to the distance traveled when the train is reversing to facilitate the driver's observation.

[0032] The permissive signal control of LKJ is revised as follows:

[0033] 1) When a freight train passes a passing signal with a permissive signal set in the onboard data, and the locomotive signal information is HB code or no code determined by logic, LKJ calculates and generates a control mode curve with the signal as the control target point, and determines 20km / h as the fixed mode speed limit value to monitor the train passing the signal until the next passing signal (station entry signal).

[0034] 2) If the locomotive signal information is HU code or H code, the freight train still needs to press the stop-and-go control before the passing signal with the on-board data set to be equipped with a permissive signal, and the stop control will be released after stopping for 2 minutes.

[0035] The basic contents of the freight train operation control method based on LKJ described in the present invention are: (1) when the train starts to press the hook, LKJ detects that the direction of the handle is opposite to the direction when the train starts to press the hook, and allows the train to retreat to press the hook. According to the formula (1) in the implementation steps of the above content, the allowable retreat distance is calculated. When the locomotive signal HU code and H code are converted to no code, and the retreat distance does not exceed the allowable retreat distance, the emergency brake is not output; when the retreat exceeds the allowable retreat distance, LKJ outputs the emergency brake. At the same time, during the train retreat process, the remaining distance displayed on the screen display should decrease according to the running distance to assist the driver in observation. (2) When a freight train is running in an automatic block section and the passing signal shows a stop signal, the LKJ's permissive signal control can be optimized and subdivided according to the locomotive signal code: If the locomotive signal information is HB code or no code determined by logic, LKJ calculates and generates a control mode curve with the signal as the control target point, and determines 20km / h as the fixed mode speed limit to monitor the train passing the signal; if the locomotive signal information is HU code or H code, the freight train still needs to press the stop-go control before the on-board data has been set to the passing signal equipped with a permissive signal, and the stop control will be released after stopping for 2 minutes.

[0036] LKJ Press Figure 1 and Figure 2 The control process described implements the freight train operation control method described in the present invention. Figure 1 It describes the control process of preventing unexpected braking during the train hook pressing operation. Figure 2The control flow of adding code position judgment to allow signal control is described.

[0037] The LKJ-based freight train operation control method of the present invention does not require the user to add additional basic line data and control data, but only needs to refine the control data in a small amount when compiling the data; for the LKJ control software, the changes and modifications are also limited to the independent functions such as HU code conversion to non-code, permissible signal control, etc., and the feasibility is relatively high. The method described in the present invention can promote the combination of the LKJ control mode with the actual needs of on-site operations, solve the risks that may exist in the current LKJ control mode, and improve the availability and safety of LKJ.

[0038] Preferred Embodiments

[0039] When the train starts to perform the hook pressing operation, LKJ detects the direction of the handle and finds that it is opposite to the direction when the train starts to align with the mark. Combined with the scene, it determines that it is in the hook pressing operation state at this time, and calculates the allowable retreat distance according to formula (1) in the implementation steps of the aforementioned invention content. According to the relationship between the retreat distance and the allowable retreat distance, LKJ monitors the train and outputs the corresponding control logic.

[0040] In order to understand the design of the present invention, the solution to this problem will be described below with specific examples.

[0041] When the freight train is performing hook pressing operation, the number of vehicles in the train is 100, the hook is No. 13, and the value is 19.5mm. The allowable distance for retreat is: 2 / 3×100×19.5=1.3m, rounded up to 2m, that is, when performing hook pressing operation, if the locomotive signal HU code and H code are converted to no code, if the retreat distance is less than or equal to 2m, no braking is output; if it exceeds 2m, emergency braking is output.

[0042] The above content describes the basic scheme, main features and advantages of the present invention, especially shows the essence of the present invention - by a small amount of refinement of LKJ control data and optimization of LKJ control method, the problems of unexpected braking, over-advancement caused by the hook pressing operation and permissive signal control of freight trains during operation are solved, and the potential risk of safety accidents caused by freight trains during operation is completely avoided.

[0043] The above is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A freight train operation control method based on LKJ, which realizes effective control of the hook pressing operation and prevents the occurrence of unexpected braking during the hook pressing operation; The steps of this method are as follows: When the train starts to press the hook, 1) LKJ detects that the handle direction is opposite to the direction when the train was aligned with the mark, and allows the train to reverse and compress the coupler; when the reverse distance does not exceed the allowable reverse distance D, the locomotive signal HU turns to no code and does not output emergency braking; when the reverse distance exceeds the allowable reverse distance, LKJ outputs emergency braking; 2) The remaining distance shown on the screen decreases according to the distance traveled when the train is reversing, which is convenient for the driver to observe.

2. The method according to claim 1, characterized in that: The allowed receding distance D is calculated by the following formula and rounded up: In formula (1), n ​​is the number of vehicles; l is the coupling clearance, in mm; The number of vehicles n is determined according to the set parameters input by the driver, and the coupling gap l can be selected according to the coupler model.

3. The method according to claim 1, characterized in that The method also solves the problems of unexpected braking and over-advancing caused by freight trains during special operations. When a freight train runs in an automatic block section and a stop signal is displayed by a passing signal, the permissive signal control of LKJ is subdivided according to the locomotive signal code position.

4. The method according to claim 3, characterized in that The method subdivides the permissible signal control of LKJ into: 1) When a freight train is in front of a passing signal equipped with a permissive signal and the locomotive signal information is HB code or no code determined by logic, the LKJ calculates and generates a control mode curve with the signal as the control target point, and determines 20km / h as the fixed mode speed limit value to monitor the train passing the signal until the next passing signal; 2) If the locomotive signal information is HU code or H code, the freight train will still press the stop-and-go control before the passing signal with the on-board data set to be equipped with a permissive signal, and the stop control will be released after stopping for 2 minutes.

5. The method according to claim 2 or 4, characterized in that: The method does not require the user to add additional basic line data and control data, and only requires a small amount of refinement of the control data when compiling the data; for the LKJ control software, changes and modifications are also limited to the functional scope of HU code to non-code and allowable signal control.

Images