Study On Braking Performance Of Automobile Abs Based On Virtual Prototyping Technology

The anti-lock braking systems (ABS) are an active safety device which can prevent the wheels from locking by regulating the wheel's braking force automatically to ensure the lateral stability and turning steering while braking and reduce the braking distance to get the best braking effects. With the science and technology development especially computer technology develop rapidly, it has produced important influence on ABS research. With the development and appliance of virtual-typing and on the basis of the before ABS research, the paper studies braking performance using differents of control algorithms of ABS by simulation.Firstly, the theory of ABS is analyzed, and virtual prototyping technology, computational metholds of multi-body dynamics and applied software ADAMS are studyed. Secondly, the whole vehicle dynamic model is built by the sofeware ADAMS/Car, and converting the common braking function to the anti-lock braking function by setting and changing the control varials of brake system. And the co-simulation model is constructed which consists of the control model based on differents of control algorithms by using MATLAB/Simulink and whole vehicle dynamic model. Thirdly, braking performance of automobile ABS is studyed based on differents of control algorithms. no ABS, automobile ABS based on P1R3 and P1R4 logic threshold control algorithm on the high adhesion coefficient road, automobile ABS based on logic threshold control algorithm on the low adhesion coefficient road and automobile ABS based on PID control algorithm, fuzzy control algorithm and fuzzy-PID control algorithm on the high adhesion coefficient road are studyed by simulation with corresponding co-simulation model. And the above simulation results based on differents of control algorithms are compared and analyzed. Each control algorithm's control parameter or threshold value is defined. Lastly, braking performance under different initial vehicle velocities and on different adhesion coefficient roads using logic threshold control algorithm, PID control algorithm and fuzzy control algorithm are analyzed and compared. Automobile ABS based on PID control algorithm and fuzzy control algorithm can get better effects than the conventional threshold control algorithm as the results of simulation test shows.