2006 Volume 19 Issue 4 Pages 142-149
This paper discusses the integrated design strategy of CAS (Control Augmentation System) for vehicle handling quality improvement. This paper points out the similarity of the problem setting between CAS design and structure/control integrated design. As expected from the above similarity, it is observed that the phase crossover bandwidth of vehicle dynamics has crucial effect to the tracking performance for pilot control input. Furthermore, a finite bandwidth phase shaping with frequency-dependent weighting functions is proposed. Namely, the phase shaping in control bandwidth is achieved with no phase constraint in the higher frequency range. By the proposed technique, a CAS which achieves the phase shaping in the specified control bandwidth is easily designed via LMI (Linear Matrix Inequality) approach.