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Rail transit vehicle and reference speed calculation method thereof

A rail transit vehicle and reference speed technology, which is applied in the field of rail transit vehicles and their reference speed calculation, can solve the problems of long braking distance, potential safety hazards, and misjudgment of anti-skid working conditions of subway vehicles, so as to prolong the service life and prevent wheel Scuffing, the effect of reducing abnormal vibration

Inactive Publication Date: 2020-12-29
QINGDAO SRI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The reference speed is a necessary condition for the anti-skid system to perform anti-skid control. The wrong calculation of the reference speed will cause the anti-skid control system to misjudge the anti-skid condition, which may lead to an excessively long braking distance of the subway vehicle, which poses a serious safety hazard

Method used

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  • Rail transit vehicle and reference speed calculation method thereof
  • Rail transit vehicle and reference speed calculation method thereof
  • Rail transit vehicle and reference speed calculation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] see figure 1 , Topological diagram of the communication network of the anti-skid system of subway vehicles.

[0036] figure 1 Described is an embodiment of the present invention, the subway car in this embodiment is made up of 6 car formations, uses 3 cars as an internal control control unit, so the antiskid system communication network of 6 car formation subway cars consists of two identical The internal control unit is composed.

[0037] A subway vehicle has two bogies, and each subway vehicle has two hosts. The anti-skid control of the subway vehicle belongs to the frame control method, that is, one bogie is controlled by a master host or a controlled host.

[0038] A bogie has two shafts, and there is a speed sensor on each shaft (the speed sensor is the sampling point) to collect the speed of the shaft, that is, each master host or controlled host collects two speed signals.

[0039]The hot standby redundant main control host or the controlled host sends the col...

Embodiment 2

[0042] see figure 2 , the calculation process of the effective speed of the subway vehicle anti-skid system includes:

[0043] Step 1: After the system is started, the main control host or the controlled host first performs fault diagnosis, and if there is a fault affecting the speed acquisition, stop the speed acquisition.

[0044] In step 1, the fault that affects the speed acquisition means that neither of the two main control hosts of an internal control unit can obtain the speed signal.

[0045] Step 2: If the master host or the controlled host works normally, the master host or the controlled host collects the two speed signals.

[0046] Step 3: If the master host or the controlled host can collect the speed signal, judge the collected speed signal. If the collected speed signal is within the range of the minimum and maximum values ​​preset by the system (if the normal operating speed of the vehicle is 0 to 100. The minimum speed (minimum value) can be 0, and the maxi...

Embodiment 3

[0050] see image 3 , the calculation method of the reference speed of the subway vehicle anti-skid system includes:

[0051] Step 1: After the system is started, the main control host first performs fault diagnosis. If both main control hosts fail, the internal control unit cannot calculate the effective reference speed; if the main control host 1 is normal (regardless of whether the main control host 2 is normal or failure), the main control host 1 is in the working state to calculate the reference speed. If the main control host 1 fails and the main control host 2 is normal, then the main control host 2 is in the working state to calculate the reference speed.

[0052] Step 2: If both the main control host 1 and the main control host 2 fail, the controlled host in the same internal control unit cannot receive a valid reference speed, and the controlled host sends the reference speed failure result to other devices on the CAN network through CAN.

[0053] Step 3: According...

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Abstract

The invention discloses a rail transit vehicle and a reference speed calculation method thereof. The method comprises the steps that the rail transit vehicle is divided into a plurality of internal control units, and each internal control unit comprises K sections of vehicles; for any internal control unit, all speed signals of the internal control unit are collected in real time within a time period, if all the speed signals are valid, whether the difference value between the maximum value and the second maximum value in all the speed signals is smaller than a set threshold value A or not isjudged, if yes, the maximum value is set as the reference speed of the internal control unit, and otherwise, the second maximum value is selected as the reference speed of the internal control unit; if the percentage of the number of the effective speed signals and the number of all the speed signals is larger than a%, the reference speed is set to be the maximum value in the effective speed signals; and if the percentage of the number of the effective speed signals and the number of all the speed signals is less than or equal to a%, the anti-skid control function of the internal control unitis closed. The precision of reference speed selection of a subway vehicle anti-skid system is greatly improved.

Description

technical field [0001] The invention relates to the field of rail transit, in particular to a rail transit vehicle and a reference speed calculation method thereof. Background technique [0002] At present, the braking method of my country's rail transit trains is adhesive braking, that is, the braking method that generates braking force through the adhesion between the wheel and rail. The research shows that the adhesion coefficient between the wheel and the rail will decrease with the increase of the running speed, and the braking force is also constrained by the adhesion effect. If the braking force exceeds the adhesion between the wheel and the rail, sliding will occur between the wheel and the rail. During the sliding process, the temperature of the wheel tread will gradually increase, causing the tread to be scratched, which will increase the abnormal vibration of the bogie. , reducing the service life of each component, reducing the comfort of passengers, and at the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B61L25/02
CPCB61L25/021
Inventor 周士华石亿晏义张一鸣武小平刘爱明
Owner QINGDAO SRI TECH CO LTD
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