Haigang Cui

Design and Simulation of Fuzzy Control Strategy for Parallel Hybrid Electric Vehicle

A torque distribution controller based on the fuzzy logic for a double-clutch parallel hybrid electric vehicle was designed to determine the distribution of torque between engine and motor. Fuzzy logic controller is designed bases on speed, driver commands and battery state of charge. The motor auxiliary drive, ensuring the state of charge normal and providing a part of power to meet the needs of vehicle make the vehicle work in the best fuel economy state. The research results show that the fuzzy logic controller can well be assigned the torque between engine and motor. Compared to the tradition deterministic rule-based control strategy, the fuzzy logic control strategy can adjust the engine work point obviously, thereby enhancing the engine efficiency, improving fuel economy and emissions performance.

Offline Optimization of Plug-In Hybrid Electric Vehicle Energy Management Strategy Based on the Dynamic Programming

By using dynamic programming (DP) which is a kind of global optimization algorithm, an energy management control strategy for a parallel PHEV on different charging depleting range (CDR) had been studied. The results show that motor-dominant control strategy should be applied to the PHEV when CDR is less than 55km, and engine-dominant control strategy should be used when CDR is more than 55km. With optimal control strategies from DP, the best economic performance can be obtained as CDR is 55km; PHEV average equivalence fuel consumption can be reduced to 2.9L/100km which is 63% lower than that of prototype vehicle.