Energy management control strategy of multi-mode hybrid electric vehicle based on energy efficiency maximization

Abstract

The invention discloses an energy management control strategy of a multi-mode hybrid electric vehicle based on energy efficiency maximization, which is divided into two layers. The inner layer is an efficiency normalization maximization strategy, which is based on the efficiency analysis method of the global normalization efficiency factor. It is used to calculate the optimal energy distribution law, and can deal with the energy efficiency optimization problems of the hybrid mode and the pure electric mode at the same time. The outer layer is a dynamic programming, which is used to deal with the mode switching problem of multi-mode hybrid electric vehicle, and to solve the optimal mode switching commands, which can make the optimal mode switching control commands on the premise of avoidingfrequent shifting and shifting energy loss and improving the smoothness of shifting. The outer layer and the inner layer coordinate with each other to form a near-optimal energy management control strategy NEMS +, which is suitable for multi-mode hybrid electric vehicle. This method not only realizes the optimization of energy management control strategy, but also guarantees the smoothness of mode switching and the reasonable mode switching frequency.

Description

technical field [0001] The invention relates to an energy management control strategy for a hybrid electric vehicle, in particular to an energy management control strategy for a multi-mode hybrid electric vehicle that takes into account shift strategies. Background technique [0002] Before the specific energy and life of power batteries are greatly improved, the cost of fuel cells and the safety of hydrogen storage are reduced, hybrid electric vehicles are considered to be the most ideal energy-saving and environmentally friendly vehicle technology. Compared with traditional internal combustion engine vehicles, hybrid vehicles have at least two energy sources, which are electrical energy and fuel internal energy in general hybrid electric vehicles. How to control and utilize the characteristics of these two energy sources to complement each other, and to maximize the use of energy while ensuring the normal driving of the vehicle is the focus and difficulty of hybrid electri...

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Problems solved by technology

However, the optimal characteristics of this method have only been proven on parallel hybrid electric vehicles, and have not been proved for power split hybrid electric vehicles with more complex dynamic relations; meanwhile, the optimal equivalent oil-to-electricity conversion factor will change with the working conditions and it cannot handle the mode switching problem, making it unsuitable for energy management control optimization of multi-mode hybrid electric vehicles

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