Supervisory Control Algorithm Design of a 48V 4WD Hybrid Electric Vehicle with Fuel Efficiency Analysis

Presented in this paper is a 48 V-powernet-based powertrain structure with a front-wheel drive system that includes an engine and a 48 V BSG and a rear-wheel drive system driven by a traction motor without a mechanical link to the front-drive axle. The power distribution algorithm of the hybrid supervisory controller includes an electric drive mode by the rear-wheel drive motor as well as a hybrid electric control mode between the engine and the two drive motors. The results of the fuel economy simulation for the 4 WD 48 V mild hybrid system that was performed in the study are presented in this paper, along with the results of the analysis of the varying of the capacity of the rear-drive motor from 5 to 15 kW. The fuel efficiency improvement of the front engine is also compared with that of the BSG.This paper introduces a power distribution algorithm for the mild hybrid drive system model, and presents a design guideline for selecting the capacity of the rear-drive motor based on the simulation results for fuel economy and efficiency improvement.본 연구는 산업통상자원부 및 산업기술평가관리원(KEIT) 산업기술혁신사업 “48 V 기반 마일드 하이브리드의 최적 연비 구현을 위한 구조 탐색 및 제어 기술 개발(10076437)” 과제와 과학기술정보통신부 및 정보통신기술진흥센터의 대학ICT연구센터육성지원사업(IITP-2017- 2012-0-00628)의 연구결과로수행되었다