A method for optimizing power supply parameters of hybrid power supply EPS

Abstract

The invention discloses a method for optimizing power supply parameters of a hybrid power supply EPS. The method includes: collecting electric load, steering wheel angle and vehicle speed of a whole vehicle electric appliance of a heavy-duty commercial vehicle in an operation period; calculating the steering resistance distance of commercial vehicles by simulation, and fitting the analytical expressions of steering resistance moment with respect to vehicle speed and steering wheel angle to determine the critical vehicle speed of very low speed steering; counting the maximum electric load, theminimum interval time between two very low speed steering and the maximum time of a single very low speed steering; taking the charging and discharging currents of the supercapacitor as optimization variables and the minimum capacitance value of the supercapacitor and the minimum rated output current of the vehicle power supply as optimization objectives, establishing a multi-objective optimization function and setting the optimization constraint conditions; adopting a MOPSO algorithm to solve the Pareto optimal solution, and obtaining the rated output current of the vehicle power supply and the capacitance of the supercapacitor. The method is conducive to reducing the rated output current of the vehicle power supply and the capacitance value of the supercapacitor in the composite power supply, and improving the utilization rate of the composite power supply.

Description

technical field [0001] The invention relates to the field of automobile steering systems, in particular to a method for optimizing power supply parameters of a composite power supply EPS. Background technique [0002] At present, heavy-duty commercial vehicles generally adopt a hydraulic power steering system (HPS) with a single power assist characteristic. "Floating"; in addition, whether the car is going straight or turning, the steering pump of the HPS has been running at high speed under the drive of the engine. According to the data, about 80% of the running mileage of the car is in a straight line, indicating that most of the energy consumed by the HPS belongs to Reactive loss. [0003] In recent years, Electric Power Steering (EPS) has been widely used in passenger cars and light commercial vehicles due to its advantages of safety, energy saving and environmental protection. EPS provides steering assist through the motor, and the magnitude of the assist is controlle...

AI Technical Summary

Problems solved by technology

The composite power supply involved in the above patents is composed of batteries and supercapacitors. In fact, it is not the batteries that provide power for the EPS system, but the generator. In addition, the above patents do not mention the parameter optimization method of the composite power supply.

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