Analysis of energy characteristics of electromechanical composite energy storage system for vehicles
Limiting multiple energy conversions when recovering braking energy in hybrid electric vehicles is a new technical solution for the dynamic coupling of flywheel and powertrain systems.In these systems,the kinetic energy lost by a decelerating rear wheel can be stored in two forms:as electrochemical energy stored in the battery or as kinetic energy for the next acceleration.First,the energy-conversion characteristics of accelerating and decelerating vehicles are analyzed to deduce the conversion efficiency of electromagnetic couplers at mechanical and electrical ports under the rated state.Second,based on a system model established using Matlab and simulink,the power characteristics and energy characteristics of the system are discussed for a vehicle decelerating from an initial speed of 60 to 42 km/h.During deceleration,the output power of the electromagnetic coupler increases from 1.257 to 1.546 kW.The transmission power is about 1.14-1.41 times the rated power.In this process,72.34％of the kinetic energy from the rear wheel can be directly stored in the flywheel,and 27.66％of the energy can be stored in the battery after being converted by the electric port of the electromagnetic coupler.Finally,we test the electromechanical composite energy storage system to verify the rationality of the system.
hybrid powerenergy recoveryflywheel energy storageelectromagnetic couplerenergy conversion
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维普
