Matching method of EPS composite power supply of heavy-duty commercial vehicle based on power demand

Abstract

The invention discloses a matching method of an EPS composite power supply of a heavy-duty commercial vehicle based on the power demand. The matching method comprises the steps that the rotating angleof a steering wheel, the vehicle speed and the time are collected through a test, data are processed, and thus the maximum time t<dmax> for completing single-time steering and the minimum interval time t<jmin> of two times of steering are obtained; the critical vehicle speed and the critical steering power P<seps> are solved through an analytic expression of steering resisting moment changed withthe vehicle speed; the ultimate steering power P<Mmax> needing to be output by a power-assisted steering motor is solved according to in-situ steering resisting moment; the t<dmax>, the t<jmin>, theP<seps> and the P<Mmax> are synthesized, the range of the capacitance of a supercapacitor set is calculated based on the discharge demand, and the capacitance of the supercapacitor set is determined based on the charging demand; and then the charging limited power and the discharge limited power of the supercapacitor set are calculated, the maximum electrical load of a vehicle electrical applianceand the critical steering power are combined to be matched with the output power of the vehicle power supply. The vehicle power supply and supercapacitors in the EPS composite power supply of the heavy-duty commercial vehicle are matched rapidly and advantageously, so that power distribution is more reasonable under the premise that the using requirements are met, and the energy utilization rateof the composite power supply is increased.

Description

technical field [0001] The invention relates to the technical field of automobile steering, in particular to a matching method of EPS composite power supply for heavy commercial vehicles based on power demand. Background technique [0002] Compared with hydraulic power steering (HPS), electric power steering (EPS) has been widely used in light vehicles due to its excellent performance and lower energy consumption. However, the front axle load of heavy-duty commercial vehicles is large, and the steering resistance torque that the steering system needs to overcome during low-speed steering is large, so that the power supply system of the whole vehicle cannot meet the power required by the EPS power-assisted motor for low-speed steering. Therefore, the existing EPS solution is not suitable for heavy-duty commercial vehicles. commercial vehicle. [0003] Although the steering power required for heavy-duty commercial vehicles to turn on the spot is large, most of the time they a...

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Problems solved by technology

Although the above patents propose the application based on composite power EPS, there i

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