CN-117382709-B - Method for judging train no longer moves before door opening

CN117382709BCN 117382709 BCN117382709 BCN 117382709BCN-117382709-B

Abstract

The invention discloses a method for judging that a train does not move any more before a door is opened, comprising the following steps of S1, acquiring a train motion state; step S2, judging whether the train is stationary, if the train is stationary, entering step S3, obtaining a traction command state of the train in a traction command delay time window, step S4, judging whether a traction command is applied, if the traction command is applied, entering step S5, obtaining the traction force of the traction command state, step S6, judging whether the traction force is higher than an adhesive force threshold value, if the traction force is higher than the adhesive force threshold value, entering step S7, obtaining a time difference value between the last applied traction command which is higher than the adhesive force threshold value and the current moment, and step S8, judging whether the difference value exceeds the traction command delay time, if the traction command is applied, judging that the train is not moved any more. Jitter or movement of the train due to possible residual traction in transit is avoided.

Inventors

YU ZHIHAO

Assignees

上海电气泰雷兹交通自动化系统有限公司

Dates

Publication Date: 20260505
Application Date: 20231129

Claims (4)

1. A method for enabling a determination that a train is no longer moving prior to opening a door, comprising: Step S1, acquiring a train motion state; Step S2, judging whether the train is stationary, if the train is stationary, entering step S3, and if the train is not stationary, entering step S3 after the train is stationary; step S3, acquiring a traction command state of the train in a traction command delay time window; Step S4, judging whether a traction command is applied, and if the traction command is applied, entering step S5; Step S5, obtaining the traction force in the traction command state; Step S6, judging whether the traction force is higher than an adhesive force threshold value, if so, entering step S7; step S7, obtaining a time difference value between the last applied traction command higher than the adhesive force threshold and the current moment; Step S8, judging whether the difference exceeds the traction command delay, if not, returning to the step S1, and re-acquiring the traction command state of the train in the past period of time, if so, considering that the train does not move any more; in the step S6, when the condition that the train is stationary is satisfied, the train is stationary and the traction force is large in the past period of time Always less than the adhesion threshold 。
2. The method according to claim 1, wherein in the step S4, it is determined whether a traction command is applied, and if the traction command is not applied, the train is considered to be no longer moving.
3. The method for enabling determination of no longer moving of train before opening door as claimed in claim 1, wherein in step S6, the traction threshold is obtained when the train is running on a straight track Firstly, calculating a wheel track adhesion coefficient measured value in the following manner: ; Wherein, the As a measure of the adhesion coefficient of the wheel track, The traction force is dynamically output by the train, For an actual wheel-rail vertical load, Is the actual acceleration of the train.
4. A method for enabling determination of no longer moving of a train before opening of a door as claimed in claim 3, wherein the adhesion coefficient value is obtained by a sliding average of the calculated wheel-rail adhesion coefficient measurements Then traction threshold The calculation formula is as follows: 。

Description

Method for judging train no longer moves before door opening Technical Field The invention relates to the technical field of urban rail transit signals, in particular to a method for judging that a train is not moved any more before a door is opened. Background In the prior art, before the train is started, only whether the corresponding condition at the current moment is met is checked, and whether the kinetic energy accumulated by the train before is exhausted is not considered, so that a shaking and even moving scene still occurs when the train is started possibly. Such as when the train was previously applying a secondary pull but the train has not responded (the pull command is in the way), and at this point the door opening condition is just met, and the train waits for the brake to be fully applied for an excessive period of time. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a method for judging that a train is not moved before a door is opened, so that the shaking or movement of the train caused by possible residual traction in the way is avoided. The technical scheme for achieving the purpose is as follows: A method for enabling a determination that a train is no longer moving prior to opening a door, comprising: Step S1, acquiring a train motion state; Step S2, judging whether the train is stationary, if the train is stationary, entering step S3, and if the train is not stationary, entering step S3 after the train is stationary; step S3, acquiring a traction command state of the train in a traction command delay time window; Step S4, judging whether a traction command is applied, and if the traction command is applied, entering step S5; Step S5, obtaining the traction force in the traction command state; Step S6, judging whether the traction force is higher than an adhesive force threshold value, if so, entering step S7; step S7, obtaining a time difference value between the last applied traction command higher than the adhesive force threshold and the current moment; And S8, judging whether the difference exceeds the traction command delay, if not, returning to the step S1, and re-acquiring the traction command state of the train in the past period of time, and if so, considering that the train does not move any more. Preferably, in the step S4, it is determined whether a traction command is applied, and if the traction command is not applied, the train is considered to be no longer moving. Preferably, in the step S6, when the train runs on a flat track, the traction threshold Fs is obtained by first calculating the wheel-track adhesion coefficient measured value as follows: Ψ′=(f-m*a)/m; Wherein, ψ' is the measurement value of the wheel-rail adhesion coefficient, f is the magnitude of the traction force dynamically output by the train, m is the vertical load of the actual wheel-rail, and a is the actual acceleration of the train. Preferably, the adhesion coefficient value ψ is obtained by a sliding average method on the calculated wheel track adhesion coefficient measurement value, and then the traction force threshold value Fs is calculated according to the following formula: Fs=Ψ*m。 Preferably, in the step S6, when the condition that the train is stationary is satisfied, the magnitude f of the traction force is always smaller than the annual adhesion threshold Fs in a period of time in which the train is stationary. The invention has the advantages that whether the traction command is applied, whether the traction command is higher than the adhesive force threshold value or not and whether the traction command delay is exceeded or not are judged by judging whether the traction command delay is exceeded or not in a period of time for a stationary train, so long as the traction force of the train does not exceed the adhesive force threshold value all the time, the traction command delay is not required to be judged, and the train can be judged to not move any more as long as the difference between the traction command which is applied last time and the traction command which is higher than the adhesive force threshold value and the current time exceeds the traction command delay, and train shaking or movement caused by possible residual traction in the way is avoided. Drawings Fig. 1 is a flow chart of a method of the present invention for enabling a determination that a train is no longer moving before a door is opened. Detailed Description The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention a