Improved Self-Tuning Fuzzy Proportional-Integral-Derivative Versus Fuzzy-Adaptive Proportional-Integral-Derivative for Speed Control of Nonlinear Hybrid Electric Vehicles

The objective of this paper is to identify the suitable advance controller among optimized proportional-integral-derivative (O-PID), improved self-tuning fuzzy-PID (ISTF-PID), advanced fuzzy nonadaptive PID (AF-NA-PID), and AF-adaptive PID (AF-A-PID) controllers for speed control of nonlinear hybrid electric vehicle (HEV) system. The conventional PID (C-PID) controller cannot tackle the nonlinear systems effectively and gives a poor tracking and disturbance rejection performance. The performances of HEV with the proposed advance controllers are compared with existing C-PID, STF-PID, and conventional fuzzy PID (C-F-PID) controllers. The proposed controllers are designed to achieve the desired vehicle speed and rejection of disturbance due to road grade with reduced pollution and fuel economy.