Subway Train Braking System: A Fuzzy Based Hardware Approach | Science Publications

American Journal of Applied Sciences

Mamun B.I. Reaz¹  Badariah Bais¹  Hafizah Husain¹  Jubayer Jalil¹ 

关键词: Fuzzy logic;    fuzzy controller;    braking system;    Field-Programmable Gate Arrays (FPGA);    brake pressure;    accurate response;    defuzzification module;    proposed approach;    rule selector;    subway train;    rule selector;    brake pressure;   

DOI  :  10.3844/ajassp.2011.740.747

学科分类：自然科学（综合）

来源: Science Publications

【 摘 要 】

Problem statement: Automated subway train-braking system require perfection, efficiencyand fast response. In order to cope with this concerns, an appropriate algorithm need to be developedwhich need to be implemented in hardware for faster response. Approach: In this research, the FPGArealization of fuzzy based subway train braking system has been presented on an Alter FLEX10Kdevice to provide an accurate and increased speed of convergence of the network. The fuzzy basedsubway train braking system is comprised of fusilier, inference, rule selector and defuzzifier modules.Sixteen rules are identified for the rule selector module. After determining the membership functionsand its fuzzy variables, the Max-Min Composition method and Madman-Min implication operator areused for the inference module and the Centre of Gravity method is used for the defuzzification module.Each module is modeled individually using behavioral VHDL. The layers are then connected usingstructural VHDL. Two 8-bit and one 8-bit unsigned digital signals are used for input and outputrespectively. Six ROMs are defined in order to decrease the chances of processing and increasing thethroughput of the system. Results: Functional simulations were commenced to verify the functionalityof the individual modules and the system as well. We have validated the hardware implementation ofthe proposed approach through comparison, verification and analysis. The design has utilized 2372units of LC with a system frequency of 139.8MHz. Conclusion: In this research, the FPGA realizationof fuzzy brake system of subway train has been successfully implemented with minimum usage oflogic cells. The validation study with C model shows that the hardware model is appropriate and thehardware approach shows faster and accurate response with full automatic control.

【 授权许可】

Unknown