Hybrid electric vehicle compound power supply with maximally optimized energy efficiency and method of hybrid electric vehicle compound power supply

Abstract

The invention discloses a hybrid electric vehicle compound power supply with maximally optimized energy efficiency and a method of the hybrid electric vehicle compound power supply. The compound power supply comprises a storage battery, a super-capacitor and a DC / DC converter, wherein the super-capacitor is serially connected with the DC / DC converter and then parallelly connected with the storage battery. The optimization method includes the steps: building mathematic models of the storage battery, the super-capacitor and the DC / DC converter; solving the loss of each model and the total power loss; concluding limiting conditions of the total loss to obtain an energy efficiency maximizing optimization model; solving by an approximate programming method; approximating a target function and constraint conditions of the optimization model as a linear function, solving the linear function by a simplex method, and taking an optimal solution meeting original conditions as a final solution of the optimization model. Power loss of an optimized compound power supply energy storage system is greatly reduced as compared with power loss before optimization, and energy use rate is increased. Working points of high-efficiency areas of the storage battery and the super-capacitor are increased and more densely distributed.

Description

technical field [0001] The invention relates to an energy storage device of a hybrid electric vehicle and an energy efficiency optimization method thereof. A supercapacitor is connected in parallel with a battery through a DC / DC converter to form a composite power supply, and the energy efficiency of the composite power supply is optimized. Background technique [0002] Due to the rising oil prices and the deteriorating global warming problem, the automotive industry has been exploring a solution to improve fuel efficiency and reduce carbon dioxide emissions. Hybrid vehicles have developed due to their advantages in energy saving and environmental protection. become an inevitable trend. [0003] However, at present, the power performance of hybrid electric vehicles is still inferior to that of traditional fuel vehicles. The main reason is that the battery energy storage system has low specific power and short cycle life. It is difficult for the battery to meet the high power...

AI Technical Summary

Problems solved by technology

[0003] However, the power performance of hybrid electric vehicles is still not as good as that of traditional fuel vehicles. The main reason is that the battery energy storage system has low specific power and short cycle life. It is difficult for the battery to meet the high power of the load when the hybrid electric vehicle starts and accelerates instantaneously. Density requirements and sufficient energy recovery during rapid braking greatly limit the rapid development of hybrid vehicles

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