| With the rapid development of our country’s economy and society, the city pattern is gradually changing from single-center "radial" to multi-center "network". City regional railway, as a fast, high-capacity, public-transport mode of passenger traffic, which connects city center, surrounding satellite towns and suburban towns, has more and more prominent advantages, and will become a hotspot of city public transportation system. In this paper, taking bogie-based braking system of city regional EMU as an object, the following research work is accomplished:(1) Based on the development of city regional railway in China and overseas, the technical characteristics of city regional railway and EMU are analyzed.(2) From the aspects of control system, bogie equipment, air supply system, towing equipment, the composition and principle of bogie-based braking system for city regional EMU are described in detail, and topology of control system and principle of pneumatic braking control unit are deeply analyzed.(3) Based on comprehensive analysis of functional requirements of bogie-based braking system, the software module of braking control unit is divided, and interface, architecture, implementation of each module are analyzed and designed in detail.(4) In order to identify BCU of different positions within a CAN unit, a conversion scheme between internal CAN and external CAN message ID is proposed.(5) Based on comprehensive analysis of ED-EP cooperation, an optimization scheme of avoiding ED-EP superposition is proposed: within a specified time limit(according to the rising time of ED brake force) from brake starting(or braking level increasing), BCU treats ED capacity as realized ED force to supply EP brake;and later, EP brake supplement is on based on ED actual value from TCU.(6) Based on studying ED-EP conversion of stopping brake, the following control principles are put forward:First control EP brake commands to rise, and after a specified time limit(which is determined according to the difference between EP response time and ED response time),control ED brake commands to decline;Apply EP brake in all bogies synchronously to compensate the decline of ED force.(7) From the perspective of TCMS and TCU, choice between MVB port data from two gateway valves within a CAN unit is proposed.(8) Taking bogie-based braking system for Wenzhou regional EMU of line S1 as an example, by means of hardware in the loop simulation test bench, comprehensive test of braking force distribution function is conducted and diagrams of braking commands of each bogie varying with time under different conditions are generated. The test results show that the braking force distribution module achieves expected results. |
PDF Full Text Request