A vehicle-mounted composite power supply for hybrid electric vehicles

Abstract

The invention discloses a vehicle-mounted hybrid power supply applied to a hybrid electric vehicle. The structure that a power battery is directly connected with a load, and a super capacitor is connected with a bidirectional DC / DC converter in series and is connected with the power battery in parallel is adopted. A power bus transmits the total power needed by a motor to the control strategy of the DC / DC converter, and the total power is distributed to the power battery and the super capacitor according to actual working condition needs through the control strategy of the DC / DC converter. The vehicle-mounted hybrid power supply can control the flowing of the electric power needs of the whole vehicle between the battery and the super capacitor, the fast and efficient charging and discharging characteristics of the super capacitor are fully utilized to relieve the impact of large currents on the battery, brake energy is recovered, the working life of the power supply is prolonged, and the peak clipping and valley filling idea of the hybrid power supply is achieved.

Description

technical field [0001] The invention relates to an energy storage device for a vehicle-mounted composite power supply of a hybrid electric vehicle. A power battery is used as a main energy source, a super capacitor is used as an auxiliary energy source, and a control strategy adopts self-adaptive fuzzy neural network control to realize reasonable distribution of energy. Background technique [0002] With the deterioration of the global environment and the increasing shortage of energy, hybrid electric vehicles have become a hot spot in the development of new vehicles. The performance and cost of power supply units for hybrid electric vehicles are an important basis and prerequisite for its role in energy conservation and emission reduction. At present, it is difficult for the high specific energy power battery used in hybrid electric vehicles and the high specific power power battery used in hybrid electric vehicles to independently meet the dual needs of power and energy fo...

AI Technical Summary

Problems solved by technology

However, the fuzzy logic control strategy lacks a systematic method when establishing fuzzification and defuzzification methods, mainly relying on experience and trial and error; it is difficult to summarize fuzzy control rules; change of situation

[0004] Both logic threshold control and fuzzy logic control are rule-based control strategies, but the threshold value in the fuzzy logic control strategy is fuzzy, and the formulation of rules is often obtained by manual experience and continuous trial and error, which is difficult to obtain automatically. Lack of systematic learning methods

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