【摘要】：推土機作為土方作業(yè)機械,其作業(yè)工況復雜,負載變化頻繁,且傳統(tǒng)液力機械傳動方式能量利用率低、能耗高、排放差。同時,隨著環(huán)境污染與能源緊張問題日趨嚴重,混合動力作為一種有效的節(jié)能減排技術是改善推土機燃油經濟性的最佳途徑。對于混合動力系統(tǒng)來說,設計合理的能量管理策略是提高推土機燃油經濟性的關鍵�；旌蟿恿δ芰抗芾聿呗愿鶕仆翙C行駛作業(yè)特性及各部件工作特性,實現對多動力源的合理分配,降低推土機的燃油消耗,達到節(jié)能減排的目的。本文以串聯(lián)混合動力推土機為研究對象,以降低推土機燃油消耗為目的,對串聯(lián)混合動力推土機能量管理策略進行研究。本文主要研究內容如下:(1)通過對混合動力履帶車輛結構的分析研究,確定串聯(lián)混合動力推土機的結構及參數,對串聯(lián)混合動力推土機的工作模式進行詳細的分析。(2)采用后向式仿真建模,通過理論建模與實驗數據建模相結合的方法建立發(fā)動機、發(fā)電機、超級電容、驅動電機等模型�；贛ATLAB/simulink搭建混合動力推土機仿真平臺,通過行駛作業(yè)性能的仿真分析對其進行驗證,為能量管理策略的研究分析提供仿真平臺。(3)通過對基于確定規(guī)則的能量管理策略工作原理的分析研究,采用恒溫器式+功率跟隨式能量管理策略。確定發(fā)動機最佳燃油消耗輸出功率區(qū)間和超級電容SOC的上下限,設計適用于推土機的能量管理策略。通過仿真分析表明,與傳統(tǒng)結構相比推土機燃油經濟性提高了23.1%。(4)考慮推土機的行駛作業(yè)特性,提出基于模糊控制的能量管理控制策略。根據模糊控制理論知識,結合整車仿真平臺及推土機的工況特點,設計模糊控制器的輸入輸出和模糊控制規(guī)則,利用MATLAB模糊控制工具箱完成模糊控制策略模型。通過仿真分析表明,與傳統(tǒng)結構推土機相比燃油經濟性提高了25.3%,與基于確定規(guī)則的能量管理策略相比能夠更合理的分配整機能量,顯著的改善了推土機的燃油經濟性。
[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.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU623.5

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