Electric-pneumatic composite braking control method for train

Abstract

The invention discloses an electric-pneumatic composite braking control method for a train. The train is divided into a plurality of bullet train trailer units, and electric-pneumatic composite braking is performed in each bullet train trailer unit; a traction control unit and a brake control unit are arranged on the bullet train trailer unit; the control method comprises the following steps thatS1, the traction control unit and the brake control unit receive a brake instruction and a brake level signal; S2, the traction control unit calculates an electric braking force theoretical value Fe0and executes electric braking force; the brake control unit calculates the unit brake requirement Fu, the bullet train brake requirement Fd and the trailer brake requirement Ft; S3, the traction control unit determines an electric braking force feedback value Fe, and sends the electric braking force feedback value Fe and an electric braking effective signal to the brake control unit; S4, the brakecontrol unit calculates the air brake supplementing amount of the bullet train and the trailer and executes air brake; signal delay is effectively reduced, the real-time performance of electric-pneumatic composite braking is enhanced, and the response speed of electric-pneumatic braking is increased.

Description

technical field [0001] The invention belongs to the field of rail transit vehicles, and specifically proposes an electro-pneumatic hybrid braking control method for trains. Background technique [0002] At present, the braking force of most urban rail trains comes from the electric braking force provided by the traction system and the air braking force provided by the braking system. The common braking and fast braking functions of the train all adopt the electric-pneumatic hybrid braking method. The braking force of the train is shared by electric braking and air braking, which requires an electro-pneumatic hybrid braking method to manage the coordination between the two braking forces. [0003] At present, there are mainly several ways of electro-pneumatic hybrid braking: [0004] (1) Calculated and controlled by the braking system [0005] The braking system calculates the total braking force demand of the train or unit according to the braking level and train load, and...

AI Technical Summary

Problems solved by technology

[0014] (1) The delay is large, causing the train to rush and the brake shoes to wear

[0015] When electric-pneumatic hybrid braking is performed, the braking system needs to send an electric braking request signal to the traction system first, and then the traction system receives the electric braking request signal to control the output of electric braking force, and finally sends an electric braking feedback signal to the braking system , this process will bring a large delay; the large delay problem cannot be avoided when the network participates in signal transmission

A large delay will cause the superimposition of air braking and electric braking, resulting in excessive train impulse, affecting passenger comfort, and increasing brake shoe wear

[0016] (2) The signal interface is complex

[0017] The complexity of the interface indicates that the probability of failure is greatly increased. When the electric braking request signal fails, the traction system cannot obtain the electric braking demand value, so that the electric braking force cannot be normally exerted, which will affect the entire electric-pneumatic hybrid braking process. , the braking reliability of the system is reduced

[0018] (3) High requirements for real-time and reliability of the network system

If the network system fails, the electro-pneumatic hybrid braking function will not be realized

[0020] (4) Poor adaptability to trains

[0021] The way of transmission through the network system has poor adaptability to the train, and requires a high-performance train network system, and the train has corresponding communication cables and interfaces, especially for some existing models with poor network system performance.

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