Simulation Research on Fuel Consumption Reduction Strategy of 48V Micro Hybrid Electric Vehicles

Abstract

The regulations for energy conservation and emission reduction have become increasingly stringent for the automotive industry. Under the current technology and industry background, traditional internal combustion engine vehicles adopt various mainstream energy-saving technologies, and it is still difficult to meet the fuel consumption target value, and the technical cost of R&D is above 10,000 yuan. The 48V micro- hybrid system has great advantages in terms of R&D difficulty and R&D cost compared to the strong-hybrid and pure-electric systems, and has a good fuel-saving effect. 48V micro-hybrid system is the most effective technology to achieve energy-saving and emission-reduction goals through low-cost at this stage. With the increasingly stringent regulations for energy conservation and emission reduction in various countries, more and more automakers and auto parts suppliers have begun to develop 48V micro- hybrid systems. In this paper, a simulation study of the 48V micro-hybrid system to reduce fuel consumption strategy is carried out, including intelligent start and stop, brake energy recovery, torque assist and battery management. Select a specific vehicle type and use the full vehicle power simulation software Cruise to build a 48V micro-hybrid vehicle model, including engine model, BSG motor model, battery model, tire model, etc., and use MATLAB/Simulink to implement the corresponding control strategy. Carry out a co-simulation with the vehicle model entered into Cruise. Under specific conditions, compare the fuel consumption of the original car and the car equipped with a 48V micro-mix system. Simulation results show that under NEDC conditions, the fuel consumption of this model equipped with a 48V micro-mix system can be reduced by approximately 15% compared to the original vehicle. At the same time, the simulation by changing the capacity of the battery shows that continuously increasing the capacity of the battery does not greatly improve the fuel saving effect.