Performance Improvement for A-double Combination by introducing a Smart Dolly

This study is focusing on how much the performance of a tractor, semitrailer, dolly and semitrailer (A-double) combination can be improved by a controlled/smart dolly which is equipped with integrated (electric/hydraulic) propulsion, steering, and braking. The aim is to achieve similar performance as the tractor-semitrailer combination which only has half of the loading capability in volume or tonnes. The results showed that performances such as startability, gradeability, rearward amplification, and yaw damping, for the A-double with smart dolly have same or similar as the tractor-semitrailer.