Abstract
Keywords:
FCHEV (Fuel Cell Hybrid Electric Vehicle), Battery SOC (State of Charge), Power distribution control strategy, Fuzzy logic controller, Fuel economy.
Abstract
This paper presents a new type of fuzzy logic-based power control strategy for a fuel cell hybrid electric vehicle to improve fuel economy while maintaining the battery SOC. Since the fuel cell system has inherent limitation such as slow response time and low fuel efficiency especially at the low power region, the battery system has come to be used to assist the fuel cell system. To maximize the advantage of this hybrid type of configuration, the power distribution control strategy is required for the two power sources: the fuel cell system and the battery system. The required fuel cell power is procured using fuzzy rule base by referring the vehicle driving status and the battery status. In order to show the validity and the effectiveness of suggested power control strategy, some simulations are performed using a mid-size vehicle for three types of standard drive cycles. First, it is shown that the fuzzy logic-based power control strategy improves the fuel economy compared with the static power control strategy. Second, the robustness of proposed power control strategy is verified against system parameter variations.