Application Of Composite PID Fuzzy Control To ABS

Anti-lock Braking System(ABS) as one of automobile active safety devices can ensure operatability and stability when automobile brake,and avoid the occurrence of dangers such as pileup,sideslip,loss of steering and so on,then ensure the safeties of lives and property of drivers and passengers. But road conditions are complex and uncertain,ABS often has poor adaptability under different road surfaces.So this paper tries to use composite PID and fuzzy technology to improve ABS's adaptability,and around the center to discuss.First the preface proposes that this paper focuses on improvement of control method which is one of three ABS development trends,second introduces composition of ABS,installation type, basic control principle to make further research is easier to understand,and finally elaborates automotive modeling,PID and fuzzy control algorithm,simulaion and analysis.The last part as a key is divided into three parts,part one when analyzes automotive modeling introduces single wheel vehicle model,four wheel vehicle model,and vehicle model under ADAMS/Car at a different angle,because of different research needs these models are applied in different research areas. Part two is about PID and fuzzy control algorithm ,first it studies PID and fuzzy control,gives PID control parameters tuning method,and then introduces fuzzy control theory,application and development,design method,finally four composite PID and fuzzy control structure represented by PID and fuzzy control, fuzzy self-adaptive PID control,two-dimensional PID and fuzzy control,decomposed PID fuzyy control are proposed,and some control algorithms are derived and analyzed. In order to verify the performance of ABS based on PID control,fuzzy control,a composite PID and fuzzy control,simulation used single wheel vehicle model is done,and road surface includes high adhesion coefficient road surface, low adhesion coefficient road surface,high-low adhesion coefficient road surface,low-high adhesion coefficient road surface. The result shows that although composite PID and fuzzy control'performace under parts of road surface is also not good,compared with the other two control technology,its adaptability is improved greatly,the expected goals of this study is achieved.