A Novel Dynamic Measurement System for Evaluating the Braking Coordination of Articulated Vehicles

The braking coordination between tractor and semitrailer is vital to the safety of articulated vehicles. traditional evaluation about braking coordination is based on the pressure measurement along air braking pipeline,which needs to change original braking structure to install gauges and cannot directly reflect the final braking coordination of different wheels. to overcome these limitations,this paper proposes a novel dynamic measurement system for evaluating the braking coordination of articulated vehicles. during the brake test,all wheel velocities of the whole articulated vehicle are synchronously obtained through a specially designed distributed acquisition platform. to effectively eliminate gross errors and noises in wheel angular velocity data,a 3-order autoregressive (ar) model and an improved-thresholding wavelet filtering algorithm are developed. further,a novel direct evaluation method about braking coordination is proposed according to the differences in angular velocity dropping time of all wheels. finally,the overall system is assessed through real field tests. the results validate the feasibility and effectiveness of the proposed system. © 2016 xu li et al.