Hybrid electric vehicle energy optimization management method considering battery performance degradation

Abstract

The invention discloses a hybrid electric vehicle energy optimization management method considering battery performance degradation. The method includes the following steps that according to a Chinesecity typical cycle working condition, an energy management optimal control strategy taking fuel consumption and battery performance degradation into balanced consideration for an electric quantity sustaining type hybrid electric vehicle is made, battery power serves as a control variable, the state of charge serves as a state variable, a weight factor is introduced, the sum of fuel consumption cost, battery performance degradation cost and electric quantity sustaining cost at each stage serves as an objective function, and a global optimal control problem is generated and solved through a discrete dynamic programming algorithm; and finally a control rule capable of being used for the real vehicle is extracted according to an optimization result. Compared with the prior art, on the basis that fuel economy is guaranteed, increased battery inner resistance can be effectively reduced, the battery peak power is increased, the service life of the battery is prolonged, the power performanceof the vehicle can be improved, and the total use cost of the vehicle is reduced.

Description

technical field [0001] The invention belongs to the technical field of energy management of hybrid electric vehicles, and in particular relates to an energy optimization management method of hybrid electric vehicles considering battery performance attenuation. Background technique [0002] In the era of global energy shortage and increasing awareness of environmental protection, coupled with the development of the automobile industry, traditional internal combustion engine vehicles can no longer meet the requirements of the current era due to their high pollution and high energy consumption. The development of energy-saving and new energy vehicles is imminent. Due to the technical limitations of pure electric vehicle battery mileage and energy density in new energy vehicles, the current hybrid vehicles are gradually being favored by vehicle developers and consumers. A hybrid vehicle is a vehicle that combines the engine, motor and battery through a control system. It combine...

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Problems solved by technology

For example, the Chinese patent publication number is CN104627167A, and the publication date is 2015-5-20, which discloses a hybrid electric vehicle energy management method considering battery life, which uses the sum of fuel consumption cost and battery capacity decay cost as the control strategy cost function, It can effectively improve the battery life, without considering that the hybrid electric vehicle works in the power maintenance mode, and its battery is a power battery, and the battery capacity decay model is not suitable for the hybrid electric vehicle

[0004] In addition, hybrid control strategies can generally be divided into rule control strategies and optimal control strategies. Although rule control strategies are often used in real-time control, the determination of the rules often requires repeated debugging based on experience or intuitive observations due to the lack of accurate mathematical models. Therefore, its performance level is very dependent on the adjustment of rules, and the dynamic programming global optimization management strategy with excellent performance in domestic research cannot be directly applied to real-time control because of offline optimization.

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