Study on Vehicle Velocity Controller for the Energy Regeneration System of the Hydraulic Hybrid Vehicle

Abstract

This paper simplifies the energy regeneration-based vehicle velocity system of the hydraulic hybrid bus into a process in which the extension rod of the hydraulic cylinder drives the secondary-element variable delivery pump/motor to change its displacement. This process enables braking of the vehicle and also allows recovery of energy. Based on the mathematical model established for the system, the fuzzy self-adaptive PID controller is designed and the compared with the conventional PID controller with respect to their impact on system performance.