本文關(guān)鍵詞： Atkinson循環(huán) 仿真設(shè)計(jì) 臺(tái)架標(biāo)定 燃油經(jīng)濟(jì)性　出處：《湖南大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：由于傳統(tǒng)Otto循環(huán)汽油機(jī)采用節(jié)氣門控制負(fù)荷,油耗高,熱效率低,不能滿足混合動(dòng)力汽車的需求,目前市場(chǎng)上混合動(dòng)力汽車普遍采用的是Atkinson循環(huán)汽油機(jī)。Atkinson循環(huán)汽油機(jī)由于具有高膨脹比、通過(guò)進(jìn)氣門晚關(guān)控制負(fù)荷的特點(diǎn),因此在熱效率、燃油消耗上較Otto循環(huán)汽油機(jī)有獨(dú)特的優(yōu)勢(shì),因此對(duì)Otto循環(huán)汽油機(jī)改進(jìn)設(shè)計(jì)為Atkinson循環(huán)進(jìn)行研究是很有必要的。本文采用數(shù)值模擬計(jì)算和實(shí)驗(yàn)驗(yàn)證相結(jié)合的方法,將某Otto循環(huán)汽油機(jī)改進(jìn)設(shè)計(jì)為Atkinson循環(huán)汽油機(jī),并對(duì)Atkinson循環(huán)汽油機(jī)的性能進(jìn)行實(shí)驗(yàn)分析以及對(duì)仿真方案進(jìn)行驗(yàn)證,論文主要工作和創(chuàng)新點(diǎn)如下:(1)在一維仿真軟件GT-POWER中建立原Otto循環(huán)汽油機(jī)仿真模型,通過(guò)軟件模擬計(jì)算并與實(shí)驗(yàn)結(jié)果進(jìn)行對(duì)比,誤差在5%以內(nèi),兩者有較好的吻合,驗(yàn)證了仿真模型的準(zhǔn)確性。(2)通過(guò)模擬計(jì)算從指示熱效率、泵氣損失和燃油消耗率方面對(duì)不同的壓縮比、進(jìn)氣凸輪工作包角、進(jìn)氣門關(guān)閉時(shí)刻進(jìn)行對(duì)比分析,選擇最佳壓縮比和進(jìn)氣凸輪工作包角,依據(jù)最佳改進(jìn)方案,對(duì)關(guān)鍵零部件進(jìn)行重新設(shè)計(jì),從而完成Atkinson循環(huán)汽油機(jī)的設(shè)計(jì)開發(fā)。(3)根據(jù)實(shí)驗(yàn)臺(tái)架標(biāo)定結(jié)果,從外特性、典型工況和萬(wàn)有特性方面對(duì)Atkinson循環(huán)發(fā)動(dòng)機(jī)性能和原機(jī)進(jìn)行對(duì)比分析,實(shí)驗(yàn)數(shù)據(jù)表明整機(jī)最低燃油消耗率降低至230g/(k W·h),再將實(shí)驗(yàn)結(jié)果和仿真計(jì)算結(jié)果進(jìn)行對(duì)比,驗(yàn)證仿真設(shè)計(jì)方案的合理性。
[Abstract]:Because the traditional Otto cycle gasoline engine uses throttle to control the load, the fuel consumption is high and the heat efficiency is low, so it can not meet the demand of the hybrid electric vehicle. At present, the Atkinson cycle gasoline engine. Atkinson cycle gasoline engine is widely used in the market. Because of its high expansion ratio and the characteristics of controlling the load through the late closing of the intake valve, it is of great importance in the thermal efficiency. The fuel consumption has a unique advantage over the Otto cycle gasoline engine, so it is necessary to study the improved design of the Otto cycle gasoline engine to Atkinson cycle. The method of numerical simulation and experimental verification is used in this paper. An improved Otto cycle gasoline engine is designed as a Atkinson cycle gasoline engine. The performance of the Atkinson cycle gasoline engine is analyzed experimentally and the simulation scheme is verified. The main work and innovation of this paper are as follows: (1) the original simulation model of Otto circulating gasoline engine is established in one-dimensional simulation software GT-POWER. The simulation results are compared with the experimental results, and the error is less than 5%, which is in good agreement with each other. The accuracy of the simulation model is verified. (2) the different compression ratio, the working angle of the intake cam and the closing time of the inlet valve are compared and analyzed from the aspects of indicated heat efficiency, pump gas loss and fuel consumption rate through the simulation calculation. Selecting the best compression ratio and the working angle of the intake cam, according to the best improvement scheme, redesigning the key parts, thus completing the design and development of the Atkinson cycle gasoline engine. The performance of the Atkinson cycle engine and the original engine are compared and analyzed in typical operating conditions and universal characteristics. The experimental data show that the minimum fuel consumption rate of the whole engine is reduced to 230 g / kg / kg W 路hU, and the experimental results are compared with the simulation results. The rationality of the simulation design is verified.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TK412

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本文編號(hào)：1484143