【摘要】：發(fā)動機潤滑用變量機油泵是在定量機油泵基礎上發(fā)展而來的新技術,其排量隨發(fā)動機工況改變,可降低能耗2%至3%。本文以電磁開關齒輪式變量機油泵為研究對象,建立其數(shù)學模型及一維流動模型并以試驗驗證,并對油泵內流體運動特性進行分析并優(yōu)化。首先,在分析齒輪式變量機油泵工作原理和數(shù)學模型的基礎上,建立齒輪泵及變量機油泵一維仿真模型。通過兩種方法模擬齒輪泵內各部分容積及容積間通流面的變化,一是CAD測量法,二是搭建齒輪泵流量公式法。將齒輪泵與恒壓閥、電磁閥等連接起來建立完整的變量機油泵模型,并通過臺架試驗驗證模型精度。然后,仿真分析機油泵流體特性及控制機構的運動特性。主要包括濾清器后壓力流量變化;恒壓閥運動特性及其結構參數(shù)對油泵特性的影響;根據(jù)主從動齒輪嚙合寬度計算不同轉速下的容積效率;分析濾清器及發(fā)動機阻尼變化對油泵性能的影響等。研究表明,變量機油泵在發(fā)動機啟動階段實質為定量泵,當轉速達到1462r/min時進入變量階段,恒壓閥控制濾清器后的油壓相對穩(wěn)定,其結構參數(shù)決定著油壓大小。最后,通過分析油泵特性確定優(yōu)化目標并對其優(yōu)化。在油泵油壓及流量設計范圍內,以減小穩(wěn)態(tài)時的油壓波動及電磁閥關閉時的沖擊油壓為優(yōu)化目標,選定優(yōu)化變量并確定約束范圍,利用NLPQL算法對齒輪及恒壓閥參數(shù)進行優(yōu)化。優(yōu)化后的低壓穩(wěn)態(tài)壓力波動減小25.88%,高壓穩(wěn)態(tài)波動減小25.91%,沖擊油壓明顯減弱。本文旨在通過建模及試驗分析電磁開關齒輪式變量機油泵特性并對其進行優(yōu)化,可為油泵概念設計及改進更改提供技術支持。另外,本文所用變量齒輪泵的一維建模方法對其他變量容積泵建模有一定參考價值。
[Abstract]:Variable engine oil pump for engine lubrication is a new technology developed on the basis of quantitative engine oil pump. Its displacement can reduce energy consumption by 2% to 3% with the change of engine working condition. In this paper, the mathematical model and one-dimensional flow model of electromagnetic switched gear variable engine oil pump are established and verified by experiments, and the fluid motion characteristics in oil pump are analyzed and optimized. Firstly, on the basis of analyzing the working principle and mathematical model of gear variable engine oil pump, the one-dimensional simulation model of gear pump and variable engine oil pump is established. Two methods are used to simulate the change of volume and flow surface between different parts of gear pump, one is CAD measurement method, the other is the method of setting up the flow formula of gear pump. The gear pump is connected with constant pressure valve and solenoid valve to establish a complete model of variable engine oil pump, and the accuracy of the model is verified by bench test. Then, the fluid characteristics of the oil pump and the motion characteristics of the control mechanism are analyzed by simulation. It mainly includes the change of pressure and flow after filter, the effect of constant pressure valve movement and its structure parameters on oil pump characteristics, the calculation of volumetric efficiency under different rotational speeds according to the meshing width of main driven gear. The influence of filter and engine damping on the performance of oil pump is analyzed. The results show that the variable engine oil pump is a quantitative pump in the starting stage of the engine. When the rotational speed reaches 1462r/min, the oil pressure is relatively stable after the constant pressure valve controls the filter, and its structure parameters determine the oil pressure. Finally, the optimization objective is determined by analyzing the characteristics of the oil pump and its optimization. In the design range of oil pressure and flow of oil pump, the optimization objective is to reduce the fluctuation of oil pressure in steady state and the impact oil pressure when solenoid valve is closed. The optimization variables are selected and the constraint range is determined. The parameters of gear and constant pressure valve are optimized by NLPQL algorithm. After optimization, the fluctuation of low pressure steady state pressure and high pressure steady state pressure are reduced by 25.88 and 25.91 respectively, and the impact oil pressure is obviously weakened. The purpose of this paper is to analyze and optimize the characteristics of electromagnetic switched gear variable engine oil pump by modeling and testing, which can provide technical support for the conceptual design and improvement of oil pump. In addition, the one-dimensional modeling method of variable gear pump used in this paper has certain reference value for other variable volume pump modeling.
【學位授予單位】：上海工程技術大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U464.137.1

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