本文選題：增壓汽油機(jī) + 配氣相位�。� 參考：《吉林大學(xué)》2016年碩士論文

【摘要】：增壓進(jìn)氣道噴射汽油機(jī)在低轉(zhuǎn)速、大負(fù)荷工況下存在扭矩輸出偏低,加速響應(yīng)遲鈍等缺陷;在部分負(fù)荷工況下,傳統(tǒng)汽油機(jī)存在熱效率低,燃料能量利用率低,發(fā)動(dòng)機(jī)泵氣損失高等缺陷。針對(duì)上述問(wèn)題,本文在增壓PFI汽油機(jī)模型基礎(chǔ)上,調(diào)整配氣相位,分析其低速、大負(fù)荷工況下動(dòng)力輸出特性、部分負(fù)荷工況下燃油經(jīng)濟(jì)性提升的潛在能力,研究結(jié)論如下:第一,低轉(zhuǎn)速、全負(fù)荷工況。調(diào)整配氣相位,利用氣門(mén)重疊期的進(jìn)氣道、排氣道壓差,實(shí)現(xiàn)掃氣,提高充氣效率。本文研究轉(zhuǎn)速1200rpm、全負(fù)荷工況,結(jié)果表明:在進(jìn)氣門(mén)早開(kāi)角(IVO)為30°CA、排氣門(mén)晚關(guān)角(EVC)為20°CA時(shí),發(fā)動(dòng)機(jī)輸出最大扭矩。如氣門(mén)重疊角過(guò)大,會(huì)有部分燃油空氣混合氣流出氣缸外,造成燃油損失,影響發(fā)動(dòng)機(jī)的熱效率以及動(dòng)力輸出。當(dāng)氣門(mén)重疊角超過(guò)50°CA時(shí),發(fā)動(dòng)機(jī)扭矩急劇下降。第二,部分負(fù)荷工況�；贏tkinson循環(huán)發(fā)動(dòng)機(jī)原理,探索配氣相位影響燃油經(jīng)濟(jì)性的規(guī)律。研究轉(zhuǎn)速1600rpm、中小負(fù)荷工況,在平均有效壓力相同的情況下,隨著進(jìn)氣晚關(guān)角度的增加,發(fā)動(dòng)機(jī)的比油耗逐漸降低,尤其是在平均有效壓力小于6bar時(shí),隨著進(jìn)氣晚關(guān)角的增加,比油耗有降低趨勢(shì)。當(dāng)平均有效壓力超過(guò)6bar工況時(shí),比油耗隨著進(jìn)氣晚關(guān)角度的增加并沒(méi)有很大的降低,反而降低發(fā)動(dòng)機(jī)的扭矩輸出。中等負(fù)荷工況下,僅調(diào)節(jié)進(jìn)氣門(mén)相位不能實(shí)現(xiàn)全負(fù)荷控制,應(yīng)用節(jié)氣門(mén)與進(jìn)氣門(mén)配合工作,實(shí)現(xiàn)發(fā)動(dòng)機(jī)的全負(fù)荷控制。在轉(zhuǎn)速2400rpm、2800rpm、3200rpm、3600rpm下,中等負(fù)荷增壓狀態(tài)下,進(jìn)氣晚關(guān)角在原機(jī)55°CA的基礎(chǔ)上分別延遲至70°CA、85°CA、100°CA,節(jié)氣門(mén)開(kāi)度在20%、40%、60%、80%負(fù)荷下,發(fā)動(dòng)機(jī)的扭矩輸出分別降低約3%、8.6%、16.2%,比油耗分別降低了0.3%、0.5%、1.6%。在高轉(zhuǎn)速工況下,當(dāng)平均有效壓力超過(guò)10bar時(shí),隨著進(jìn)氣晚關(guān)角度的增加,比油耗不再發(fā)生變化。即在高轉(zhuǎn)速大負(fù)荷狀態(tài)下,進(jìn)氣晚關(guān)角度的變化并不能有效改善發(fā)動(dòng)機(jī)的經(jīng)濟(jì)性。當(dāng)平均有效壓力由4bar變化到10bar過(guò)程中,雖然進(jìn)氣晚關(guān)角度增加,但是比油耗的變化只在1.3%以?xún)?nèi),比油耗并沒(méi)有明顯降低。因此在大負(fù)荷工況下,進(jìn)氣晚關(guān)角度的增加并不能提高燃油經(jīng)濟(jì)性,而動(dòng)力輸出卻有所下降。
[Abstract]:The turbocharged intake port injection gasoline engine has some defects such as low speed, low torque output and slow acceleration under heavy load condition, while under partial load condition, the traditional gasoline engine has low thermal efficiency and low fuel energy utilization ratio.Engine pump gas loss high defects.In order to solve the above problems, based on the model of turbocharged PFI gasoline engine, this paper adjusts the phase of valve distribution, analyzes the characteristics of power output at low speed and high load, and the potential ability of improving fuel economy under partial load.The conclusions are as follows: first, low speed, full load condition.Adjust the phase of valve distribution, use the inlet of valve overlap period, exhaust port pressure difference, realize scavenging, improve the efficiency of inflation.In this paper, the rotating speed of 1200rpm is studied. The results show that the maximum torque of the engine is obtained when the inlet valve with an early opening angle of 30 擄CAand the exhaust valve with a late closing angle of 20 擄CA.If the valve overlap angle is too large, part of the fuel air mixture will flow out of the cylinder, resulting in fuel loss, which will affect the engine thermal efficiency and power output.When the valve overlap angle exceeds 50 擄CA, the engine torque drops sharply.Second, partial load condition.Based on the principle of Atkinson cycle engine, the effect of valve phase on fuel economy is explored.In the case of the same average effective pressure, the specific fuel consumption of the engine decreases gradually with the increase of the intake late closing angle, especially when the average effective pressure is less than 6bar, and with the increase of the inlet air late closing angle.There is a tendency to lower fuel consumption than oil consumption.When the average effective pressure exceeds the 6bar working condition, the specific fuel consumption does not decrease greatly with the increase of the intake late closing angle, but the torque output of the engine is reduced.Under the medium load condition, only adjusting the intake valve phase can not realize the full load control. The throttle and the intake valve are used to work together to realize the full load control of the engine.Under the condition of 2400rpmMN 2800rpmng 3200rpmng 3600rpm, under the condition of medium load supercharging, the intake late closing angle was delayed to 70 擄CA-85 擄CA-100 擄CA on the basis of 55 擄CA, respectively, and the throttle opening degree was 200.6080%, the torque output of the engine was reduced by about 38.6U 16.2and the fuel consumption was reduced by 0.3U 0.51.6.At high speed, when the average effective pressure exceeds 10bar, the specific fuel consumption will not change with the increase of the angle of late closing of inlet air.That is, under the condition of high speed and high load, the change of intake late closing angle can not effectively improve the engine economy.When the average effective pressure changes from 4bar to 10bar, the specific fuel consumption is only within 1.3%, although the inlet air closing angle increases, and the specific oil consumption does not decrease obviously.Therefore, under the heavy load condition, the increase of the intake late closing angle can not improve the fuel economy, but the power output is decreased.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TK411

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本文編號(hào)：1758334