Research On The Stopping Brake Process Of Metro Vehicles

Engineering vehicles in this paper to ningbo line 1 as the background,through debugging in practical engineering application problems for vehicle frequently owe mark basis points,to owe the reason to do a thorough analysis and put forward the solving measures,and on the basis of the logic control of the vehicle parking brake process,numerical algorithm,cooperate way are discussed in this paper,and gives the design direction,on the basis of owe standard solution,the optimal control strategy,achieve the whole domain in the process of parking brake response and dynamic.This paper aimed at the analysis of the engineering problems as the inductive and deductive methods.To owe the phenomenon of the environment,working condition of horizontal alignment,refine the problem factors,confirm the object of study for in the first phase of line 1,line in mixed run debug line 1 issue of the vehicle;Through the record program in advance,arrange the scene again and field with the car,to owe the degree,further confirmed that the frequency of the and get enough data effectively;In data analysis,in line with from exogenous to endogenous,from data to algorithm,logic from phenomenon to essence,from owe standard as a starting point,that can jump from electric braking to zero,the hybrid braking and electrical braking to zero contact analysis,the difference of the net pressure is high,the electric braking performance condition,braking chopper threshold setting and other aspects of analysis,finally obtained the owe the underlying root causes is the first and second stage vehicle traction system of chopper threshold setting is not unified conclusion.And in the process,detect the first and second phase of the vehicle network the precision of the pressure sensor,there are differences in unity chopper threshold,the difference is still likely to owe target,to prevent problems happen again,for the differences by modifying the current setting of protection operation,the application level.In solving engineering problems,on the basis of this paper to keep hybrid braking,braking,and studied the implementation of the electric braking to zero.Combined with theoretical curve design,signal system debugging of the actual curve,analyses the external characteristic of typical,according to their respective can coordinate the logic signal,trigger conditions,and based on the real-time vehicle velocity,a given acceleration,seaborne real-time acceleration,vehicle load,the gear transmission ratio,parameters such as wheel diameter,correction coefficient as a function of independent variables were studied.On this basis,by creating some theoretical scenarios,studied the brake output characteristic of each variable changes such as curve of high and low,marginal variation,a turning point,and cooperate with the numerical,etc.Through the study of this paper,we could see the parking brake is dependent on the process of the electric braking of vehicle itself,air brake performance,also with signal control model,matching algorithm,the traction power supply voltage of the power supply system,the change of the single factor all have far-reaching influence,should be comprehensively considered in the design.Moreover,parking brake control strategy and the detailed algorithm of three ways,each other is a complex restriction system,based on vehicle speed,acceleration and other variables as the input of real-time computing dynamic control strategy,can the impulse rate limit within the scope of a greater degree of play to the braking ability to improve braking efficiency and comfort.