Hybrid vehicle combined type energy management method

Abstract

The invention relates to a hybrid vehicle combined type energy management method. The hybrid vehicle combined type energy management method comprises the following steps that high-voltage bus demand power, a torque requirement of a drive motor and a torque requirement of a brake system are obtained through signals such as an accelerator pedal, a brake pedal opening degree and an actual rotation speed of the drive motor and checked maximum charge-discharge power of an energy storage system; a SOC of the energy storage system is corrected based on the checked maximum charge-discharge power of the energy storage system and the bus power; a basic switching strategy based on the upper and lower limitation of the SOC and an engine switching control strategy with trigger-turning-on during high-power requirements and trigger-turning-off during large brake are developed, an improved equivalent fuel consumption minimization strategy is used and important parameters are optimized by self-learningmethod to realize the optimal power distribution; and finally, the engine switching strategy and an energy management strategy are combined. Compared with the prior art, the hybrid vehicle combined type energy management method enables the control of the engine and the drive motor to be more accurate and efficient, and the oil saving potential under the single energy storage system is improved, and the cycle life of a lithium battery pack under the single energy storage system is prolonged.

Description

Technical field [0001] The invention relates to a hybrid power vehicle energy management method, in particular to a hybrid power vehicle composite energy management method. Background technique [0002] At this stage, pure electric vehicles have disadvantages such as high cost, fast battery life decay, and short driving range, and they have not yet been widely promoted. The tandem electric vehicle equipped with a high-efficiency diesel generator set has a lower cost and higher fuel-saving potential. It is an ideal power system structure for the transition to a pure electric system. Series hybrid electric vehicles are divided into three stages: the pure electric driving range, the energy adjustment stage of the energy storage device, and the electric energy balance operation stage. The electric energy balance operation stage accounts for a relatively high proportion, which is important for the fuel economy and circulation of series electric vehicles. The effect of charge and disc...

AI Technical Summary

Problems solved by technology

The reason for the large consumption of the braking system is that the braking recovery capacity is low, which is reflected in the low maximum charging power of the energy storage system and the recovery power occupied by the engine during braking. The reason for the large consumption of the energy storage system is, on the one hand, The charging and discharging efficiency of the lithium battery pack is relatively low. On the other hand, the charging and discharging depth of the lithium battery pack is also relatively high under a single energy storage system. Under the composite energy storage system, only the supercapacitor bank with high charging and discharging efficiency is charged and discharged.

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