Effect of fractional order damping control on braking performance for electric vehicles

摘要

Active suspensions are an object of interest nowadays, they have been a topic of research for decades due to their key role in Global Chassis Control (GCC). Indeed, a well-controlled active suspension system may considerably improve not only the passenger comfort by compensating the chassis dynamics but also road handling by minimizing the dynamics of the wheels normal forces. It may enhance vehicle stability by controlling the wheel load distribution, which influences the lateral and longitudinal dynamics to provide better steering performance, and safety by reducing the braking distance. The main contribution of this paper is to study the impact of fractional order (FO) control methods in the context of an active suspension system and in particular fractional order damping control. We derive two optimal damping control strategies: a comfort-oriented and a road holding oriented strategy, based on non-integer derivation of suspension deflection. The relevant benefits of both methods on vehicle response while driving on rough roads and during braking are evaluated using computer simulations applied on a two-wheel vehicle model.