Method for calculating train safety overspeed prevention and braking distance

Abstract

The invention discloses a method for calculating train safety overspeed prevention and braking distance. The method includes the following steps: circularly calculating variation delta Si of the distance and a real-time speed vi, accumulating the variation delta Si of the distance to total braking distance S, and judging whether or not unsafe conditions are triggered every time of circulation, wherein the variation delta Si of the distance is shown in the description, the total braking distance S is shown in the description, i and n are positive integers, and delta t is variation of time; if so, executing safe output to allow a train to brake and decelerate; otherwise, executing a next circulation till trigger is quitted normally. The invention provides a special implementation method of a safe braking model; an accurate and complete out-of-control acceleration braking curve can be obtained through calculation; the worst condition for out-of-control acceleration is taken into full consideration; influences brought by passenger weight distribution are considered; an accurate guarantee is provided for speed safety and safety intervals of train operation; safety and operation efficiency are improved.

Description

technical field [0001] The invention belongs to the field of urban rail transit safety signals, in particular to a calculation method for train overspeed protection or braking distance applied in an automatic train control system (ATC). Background technique [0002] In the field of urban rail transit safety signals, the on-board system is required to prevent the occurrence of train speed exceeding the civil construction speed required by the line and the train running beyond the authorized operating area of ​​the system according to the current train position, speed, vehicle environment, and line environment, so as to avoid derailment, collision, etc. The occurrence of vicious accidents ensures safe train intervals and improves driving efficiency. [0003] At present, the usual method is relatively simple, which is to use the train as a mass point and use the kinetic energy equation According to different limit sections, segmental calculations are performed to determine wh...

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Problems solved by technology

[0003] At present, the usual method is relatively simple, which is to use the train as a mass point and use the kinetic energy equation According to different limit sections, segmental calculations are performed to determine whether the train will exceed the speed limit ahead or the authorized operating area. The problem brought by this method is that it cannot truly reflect the actual train operation situation. In order to ensure safety, it will be increased interval between trains

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