Battery-electric-vehicle hybrid power system efficiency calculation model and optimization method

Abstract

The invention discloses a battery-electric-vehicle composite power system efficiency calculation model and an optimization method. The battery-electric-vehicle composite power system efficiency calculation model comprises a battery model, a working-mode logical judgment model, a demanded-power generation model, a system efficiency calculation model, a super capacitor and a DC-DC (direct current-direct current) inverter model. A simulation model is established under the environment of MATLAB / simulink, main consideration is given to loss of a battery and the super capacitor, efficiency characteristics of a motor is combined, system efficiency of the battery-electric-vehicle hybrid power is calculated, influences of variables of vehicle speed, vehicle acceleration and battery limit power on the system efficiency are compared, and a switching rule in a working mode is formulated. Therefore, energy utilization rate of a battery electric vehicle can be effectively increased, service life of the battery is prolonged, and travelling mileage is increased.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to an efficiency calculation model and an optimization method of a composite power supply system of pure electric vehicles. Background technique [0002] With the rapid development of the global automobile industry and the rapid growth of car ownership, the problems of energy crisis and environmental pollution are becoming more and more serious. With the official release of the "National "Twelfth Five-Year" Science and Technology Development Plan", the new energy vehicle industry technology will become a key area supported by the Ministry of Science and Technology in the next five years, so pure electric vehicles will receive more and more attention. [0003] As the government and society pay more and more attention to environmental pollution and energy issues, energy conservation and environmental protection have become one of the main goals of the development...

AI Technical Summary

Problems solved by technology

2. The battery and the supercapacitor are jointly driven, and the power required by the system is relatively large. The battery alone cannot meet the power requirements well, and the supercapacitor auxiliary battery is driven together.

[0004] At present, the division of single and dual drive of hybrid power electric vehicles mainly relies on experience, and there is no reasonable theoretical basis, resulting in low energy efficiency during driving, unreasonable use of batteries, shortened design life, and failure to maximize driving range.

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