【導(dǎo)讀】狀、存在問題及解決措施進(jìn)行了論述。發(fā)動機廢氣渦輪增壓器是汽車。被采用，甚至CNG汽車，微型汽車和摩托車上也出現(xiàn)了渦輪增壓器?，F(xiàn)在已經(jīng)有了TSI的新技術(shù)。TSI發(fā)動機的設(shè)計非常巧妙，它實際上。一起裝到一臺發(fā)動機里面。上文我們講到渦輪增壓發(fā)動機在較低和較。一個機械增壓裝置，并讓它在低轉(zhuǎn)速時加大進(jìn)氣壓力。低到高轉(zhuǎn)速的全段又一動力表現(xiàn)。濟性不但得到了顯著提高而目?嚴(yán)格，增壓技術(shù)越來越受到重視。害提出了更高的要求，從而促使車用汽油機增壓的發(fā)展。究，并取得了可喜的成果。隨著廢氣渦輪增壓器的設(shè)計、制造以及材。行車，由于空氣稀薄，明顯地感到動力不足。經(jīng)廢氣渦輪增壓后的汽油發(fā)動機排出的有害氣體大大降低。改進(jìn)增壓器、化油器及排氣管布置，污染還能進(jìn)一步減輕。大的動力性能;當(dāng)進(jìn)入市區(qū)行駛時，截斷增壓，發(fā)動機排氣總量減小，亦可減輕城市污染。汽油機增壓的發(fā)展相對較晚，技術(shù)水平也落后于柴油機。

　　

【正文】 again in the cool, the 吉林農(nóng)業(yè)大學(xué)發(fā)展學(xué)院 畢業(yè)設(shè)計論文 density increases, so that the power, torque addition, Turbocharged also help reduce NOx and particulate emissions levels, reducing diesel NOx postprocessing difficulties. The cooling in the cold the way to have the following 3 types: (1) air to air intercooler。 (2) intercooler of water on the air。 (3) of air between the oil cooler. Water cooler air circulating water can be divided into use of the engine and separate water circulation system 2 former device is simple, according to the actual conditions of space and directly installed in the vehicle engine , But the engine itself on the high temperature of wood, about about 80 90 ℃ , air cooling can get a limited the latter case, because the lower temperature cooling can be used Water, so the cooling effect of pressurized air good, but need to set up a separate cooling water system, so It can only be used for stationary industrial diesel engines or marine the oil cooler and the air Similarity between the cooler water on the air. Aircooling can be used for difficult to obtain in the low temperature cooling water the following 2 methods (1) It is inflated through the tube will be installed to separate the front and the radiator, the use of mounted Diesel engine cooling air supply fan for cooling, pressurized air can be cooled to the temperature 50 }600C o However, due to air heat transfer coefficient is much lower than water, so the volume of airwater air cooler than generally be arranged directly in the cold water tank in the front and engine cooling, but should be close to the supercharger. (2) set in front of a fan inlet, a dedicated motor lx move, the cooling effect of the most Good, but the design general, the higher pressure ratio, the use of the more significant the effect of cold, With the greater need in the adopted a supercharged engine in the cold depends on the increase Compressive strength, but also with the engine uses and conditions of use and other factors, used to weigh. In parison, aircooled for greater development potential, particularly high temperature cooling car Engines, it should give priority toair intercooler. Now monly used in vehicle engine is water cooled, because of its simple design, small size, easy in the future may be developed to the aircooled side. 吉林農(nóng)業(yè)大學(xué)發(fā)展學(xué)院 畢業(yè)設(shè)計論文 release valve Highspeed highload diesel engines, exhaust flow, and thus the exhaust energy, leading to the vortex Round of high speed supercharger, boost pressure is also high, but lowspeed diesel engines, even if the increase in load, exhaust gas flow is not large, and thus boost the air pressure is low, the engine torque increment is too a way to improve, you can use a small capacity turbochargers and mediumspeed diesel engine matched to enhance the mediumspeed diesel engine when the appeared to boost diesel engine high speed high load, the turbocharger problem of excessive bypass valve used for this purpose, the high speed and high load, the bypass valve open, let go of part of the emissions to reduce the turbocharger speed, the control pressure ratio. Deflated present mainly in the following way 2: (1) part of the exhaust into the atmosphere。 (2) some of the pressurized air into the atmosphere. From the thermodynamic point of view, put the exhaust pressurized air is more than the place is not ideal, but in fact both the impact on fuel consumption rate is not very monly used in vehicle engines is part of the exhaust into the atmosphere. A gasoline engine turbocharging system status Car CAlOB Liberation turbocharged engine system shown in Figure temperature engine exhaust gas through the branch exhaust pipe inflow turbocharger turbine shell, and then flows through the nozzle ring, playing in a higher speed gas in the turbine For powerdriven expansion of the pressor impeller coaxial turbines for power by the people back pressor and press the air intake to improve the flow and air diffuser and then through the diffuser, the flow rate decreased, the pressure and fuel mixture by the leaders of the cylinder role of boost pressure control valve when boost pressure is reached after the rating, the remaining power of the exhaust air bypass people to maintain good engine torque the supercharging pressure control valve to control the automatic adjustment. Floating bearing turbocharger to maintain the normal operation, the input of lubricant must ensure that adequate flow and pressure, in order to get a good bearing lubrication and line should be smooth. Carburetor float chamber is pressurized, so still need booster pumps to ensure adequate flow and pressure the most. In the carburetor on the turbocharged engine, but also the arrangement of booster the turbocharger on the carburetor, known as prebooster program (Figure 1), otherwise known as postbooster engines with multiple carburetors, turbochargers arrangement will bring great and rear has its own characteristics, according to the specific 吉林農(nóng)業(yè)大學(xué)發(fā)展學(xué)院 畢業(yè)設(shè)計論文 program adopted Circumstances. Preprogram characteristics of the turbocharger is to first press the air, the air density and pressure increase until after the fuel mixture into the advantages are: ① carburetor mounting position unchanged, the throat size is also not of short trip, the engine is better sensitivity, ② air temperature after pression is conducive to fuel vaporization, ③ engine backfire, not damaged pressor impeller, ④ turbocharger failure, easy with the engine disadvantages are: ① pressurized carburetor work, should be strictly s