The Research Of The Air Abs On Semi-trailer Combination Vehicles

ABS (Anti-lock braking system) is a dynamic braking system or mechanical-electrical device that can automatically adjust wheel. Locking wheel brake to prevent the effects of electromechanical integration, in order to gain the best braking system.The system can improve braking stability in the direction shorten braking distance, plays an important role in the safety of cars, has become an important vehicle active safety devices. Therefore, ABS, the domestic automobile industry is an important research topic and the focus of our projects.Semi-trailer combination vehicles is by partly hangs the trailer tractor and the semitrailer two major part is composed the automobile special-purpose vehicles, has the freight capacity in a big way, the transportation benefit is good and so on the merit, is center the long distance automobile freight transportation backbone strength and one of main development tendencies. In recent years, no matter was its quantity in the freight vehicle proportion, or it undertook the transported goods volume all year by year to increase in the path freight transportation proportion. Partly hangs the tractor-trailer vehicle height, the quality in a big way, the speed is quick, its traffic safety also more and more important.Braking stability in the direction to solve the issue of this paper is to study the Semi-trailer combination vehicles'air ABS controlling methods. ABS study in detail the basis of the theory of general structure and working principle of the main categories. Semi-trailer combination vehicles and analysis of the characteristics of air braking system; Semi-trailer combination vehicles'air ABS of the structure with the program and control methods.Based on a sliding rate of the control parameters reference adaptive fuzzy control strategy.A fuzzy control systems, and computer simulation, and analysis of simulation results.Semi-trailer combination vehicles'air ABS are two parts:Truck with the same general part of a tractor, a two-channel sensor program:front independent control principle adopted that two separate control two-wheel (wheel of the tractor-trailer) and low electoral principles of control.And the semi-trailer wheel (Tractor Trailer rear), ABS adopted SL structure.According to the simulation model, the corresponding model marked by the establishment of a Semi-trailer combination vehicles, the single model brake model a total of four mathematical model of tire model, and made a more detailed description of fuzzy control, Fuzzy MATLAB toolbox for subsequent use adaptive fuzzy controller for the establishment of the ABS,Simulation of MATLAB and use of mathematical models in a Semi-trailer combination vehicles Brake linear simulation,Simulation results show that ABS prevent Locking pressure, the effect of significantly reduced braking distance. Semi-trailer combination vehicles can guarantee safety in the braking process.According to the simulation results, analysis of the major factors affecting the air ABS, improving the feasibility of the proposal about air ABS.