The Fuzzy Logic Control Of Parallel Hybrid Electric Vehicle

Firstly, this paper gives an analysis on the types and hybrid configurations of hybrid electric vehicle, and summarizes the characters of all the driving types and their working conditions. Secondly, expatiate the control idea and the control strategy of the parallel hybrid electric vehicle, compare the difference of these control strategy, conform the control strategy based on fuzzy logic control, then, introduce the basic theory of the fuzzy logic simply. Last we sets the simulation model suitable for parallel hybrid electric vehicle, analysis the energy flow in each mode which incorporates the mode of operation of the vehicle i.e., acceleration, cruise, deceleration and so on. A variable-structured fuzzy logic controller for energy management of a parallel-hybrid electric vehicle is proposed. The proposed controller is implemented in terms of a hierarchical structure in which incorporates the mode of operation of the vehicle as well as empirical knowledge of energy flow in each mode. Moreover, the rule set for each mode of operation of the vehicle is designed in view of an overall energy management strategy that uses efficiency maps to analyze components; the state of battery charge is sustenance, and shift operating points to optimum regions. The proposed control system is evaluated via computational simulations under the NEDC urban drive cycle. Simulation results show that the proposed variable-structured fuzzy logic control strategy is effective over the entire operating range of the vehicle in terms of performance, fuel economy, at the same time state of battery charge is balanced.