串联混合动力推土机能量管理控制策略研究

发布时间：2019-04-17 13:15

【摘要】：推土机作为土方作业机械,其作业工况复杂,负载变化频繁,且传统液力机械传动方式能量利用率低、能耗高、排放差。同时,随着环境污染与能源紧张问题日趋严重,混合动力作为一种有效的节能减排技术是改善推土机燃油经济性的最佳途径。对于混合动力系统来说,设计合理的能量管理策略是提高推土机燃油经济性的关键。混合动力能量管理策略根据推土机行驶作业特性及各部件工作特性,实现对多动力源的合理分配,降低推土机的燃油消耗,达到节能减排的目的。本文以串联混合动力推土机为研究对象,以降低推土机燃油消耗为目的,对串联混合动力推土机能量管理策略进行研究。本文主要研究内容如下:(1)通过对混合动力履带车辆结构的分析研究,确定串联混合动力推土机的结构及参数,对串联混合动力推土机的工作模式进行详细的分析。(2)采用后向式仿真建模,通过理论建模与实验数据建模相结合的方法建立发动机、发电机、超级电容、驱动电机等模型。基于MATLAB/simulink搭建混合动力推土机仿真平台,通过行驶作业性能的仿真分析对其进行验证,为能量管理策略的研究分析提供仿真平台。(3)通过对基于确定规则的能量管理策略工作原理的分析研究,采用恒温器式+功率跟随式能量管理策略。确定发动机最佳燃油消耗输出功率区间和超级电容SOC的上下限,设计适用于推土机的能量管理策略。通过仿真分析表明,与传统结构相比推土机燃油经济性提高了23.1%。(4)考虑推土机的行驶作业特性,提出基于模糊控制的能量管理控制策略。根据模糊控制理论知识,结合整车仿真平台及推土机的工况特点,设计模糊控制器的输入输出和模糊控制规则,利用MATLAB模糊控制工具箱完成模糊控制策略模型。通过仿真分析表明,与传统结构推土机相比燃油经济性提高了25.3%,与基于确定规则的能量管理策略相比能够更合理的分配整机能量,显著的改善了推土机的燃油经济性。
[Abstract]:As a earthmoving machine, bulldozer is characterized by complex working conditions, frequent load changes, low energy utilization, high energy consumption and poor emission in the traditional hydraulic mechanical transmission mode. At the same time, as environmental pollution and energy shortage become more and more serious, hybrid power as an effective energy-saving and emission-reducing technology is the best way to improve the fuel economy of bulldozers. For hybrid power system, the design of reasonable energy management strategy is the key to improve the fuel economy of bulldozer. According to the operating characteristics of bulldozers and the working characteristics of various components, the hybrid energy management strategy can realize the rational distribution of multi-power sources, reduce the fuel consumption of bulldozers, and achieve the purpose of saving energy and reducing emissions. In this paper, the energy management strategy of the series hybrid bulldozer is studied in order to reduce the fuel consumption of the bulldozer. The main contents of this paper are as follows: (1) by analyzing and studying the structure of hybrid tracked vehicle, the structure and parameters of series hybrid bulldozer are determined. The working mode of series hybrid bulldozer is analyzed in detail. (2) backward simulation modeling is adopted to build engine, generator and super capacitor by combining theoretical modeling with experimental data modeling. Driving motor and other models. The simulation platform of hybrid bulldozer based on MATLAB/simulink is built and verified by simulation analysis of driving performance. It provides a simulation platform for the research and analysis of energy management strategy. (3) through the analysis of the working principle of the energy management strategy based on the rule of determination, the thermostat power follower energy management strategy is adopted. The optimal output power range of engine fuel consumption and the upper and lower limits of supercapacitor SOC are determined, and the energy management strategy suitable for bulldozer is designed. Simulation analysis shows that the fuel economy of bulldozer is improved by 23.1% compared with traditional structure. (4) considering the driving characteristics of bulldozer, an energy management control strategy based on fuzzy control is proposed. According to the knowledge of fuzzy control theory and the characteristics of whole vehicle simulation platform and bulldozer, the input and output of fuzzy controller and fuzzy control rules are designed, and the fuzzy control strategy model is completed by using MATLAB fuzzy control toolbox. The simulation results show that the fuel economy of the bulldozer is improved by 25.3% compared with the traditional bulldozer, and the energy distribution of the bulldozer is more reasonable than that of the energy management strategy based on the defined rules, and the fuel economy of the bulldozer is significantly improved.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU623.5

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