A control strategy and control parameter optimization method for a hydraulic-electric hybrid system

Abstract

The invention belongs to the field of hybrid power and discloses a control strategy of fluid and power combination hybrid power system and a method for optimizing control parameter. The driver ascertains the expected torque of the finished automobile in the current state so as to judge the running mode in which the hybrid power system should be. The driver ascertains the torque distribution of the fluid and power combination hybrid power system in the current state and a target value of an engine so as to achieve the demand of operational purpose. The control strategy of fluid and power combination hybrid power system and method for optimizing control parameter achieve a control method for energy of fluid and power combination hybrid power system, that is, give consideration to fuel economy and storage battery durability. Besides, the control strategy of fluid and power combination hybrid power system and method for optimizing control parameter optimize the key control parameter.

Description

technical field [0001] The invention relates to a control strategy and a control parameter optimization method of a hydraulic-electric compound hybrid power system, belonging to the field of hybrid power. Background technique [0002] With the rapid development of industrial technology in China, the problems of irrational use of energy and air pollution are becoming more and more prominent. Hybrid technology is recognized as one of the effective measures to solve the energy crisis and environmental pollution. At present, it is difficult for a single energy storage device to meet the high power density and high energy density requirements of the hybrid power system at the same time. Due to the limitation of internal resistance, the instantaneous charging and amplifying current of the battery is small, resulting in low power system efficiency and poor braking energy recovery. , while supercapacitors and fuel cells have obvious cost and technical safety issues. Although hydraul...

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Problems solved by technology

At present, it is difficult for a single energy storage device to meet the high power density and high energy density requirements of the hybrid power system at the same time. Due to the limitation of internal resistance, the instantaneous charging and amplifying current of the battery is small, resulting in low power system efficiency and poor braking energy recovery. , while supercapacitors and fuel cells have obvious cost and technical safety issues. Although hydraulic accumulators have high power density and mature technology, their relatively small energy density limits the application of this technology to a certain extent. Widely used in power vehicles, so hydraulic-electric hybrid power will be the main direction of hybrid power development in the future. At present, there is no control strategy and control parameter optimization method for hydraulic-electric hybrid power systems in China.

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