PROFESSIONAL ENGLISH UNIT 5 DIESEL FUEL INJECTION TEXTA Overview of Diesel Fuel Injection
UNIT 5 DIESEL FUEL INJECTION TEXT A Overview of Diesel Fuel Injection PROFESSIONAL ENGLISH
本次课学习内容 UNIT 5 DIESEL FUEL INJECTION TEXTA Overview of Diesel Fuel Injection e Overall Diesel Fuel System Injector Pump Types ● Diesel Injector Types Glow Plug and Intake Air Heaters
UNIT 5 DIESEL FUEL INJECTION TEXT A Overview of Diesel Fuel Injection • Overall Diesel Fuel System • Injector Pump Types • Diesel Injector Types • Glow Plug and Intake Air Heaters 本次课学习内容
本次课学习目标 ●掌握柴油机喷油系统的组成 ●掌握主要部件的型式及原理 ●掌握有关的专业名词与术语 了解翻译技巧—省略
本次课学习目标 ⚫ 掌握柴油机喷油系统的组成 ⚫ 掌握主要部件的型式及原理 ⚫ 掌握有关的专业名词与术语 ⚫ 了解翻译技巧—省略
NEW WORDS schematic [ski'maetik]a示意性的 alert[e"e:切v向…发出警报; clog[kg]v&n阻塞,堵塞 nozzle [noz(e)n喷嘴 jam[吗emv&n堵塞,拥挤 trap[ traep]n圈套,陷阱,捕集器 plunger[pAn吗可]n柱塞,活塞 rack[raek]n齿条 barrelr'baer()n桶;w装入桶内 helix I" hi: liks]n螺旋,螺旋状物
NEW WORDS schematic [ski'mætik] a.示意性的 alert [ə'lə:t] v.向…发出警报； clog [klɔg] v.&n.阻塞，堵塞 nozzle ['nɔz(ə)l] n.喷嘴 jam [ʤæm] v.&n.堵塞，拥挤 trap [træp] n.圈套，陷阱，捕集器 plunger ['plʌnʤə] n.柱塞，活塞 rack [ræk] n.齿条 barrel['bær(ə)l] n.桶；v.装入桶内 helix ['hi:liks] n.螺旋，螺旋状物
cutaway[ kAtwei]a切去一部分的,剖面的 instantly" instant]ad立即地,即刻地 variation [ veari' eian]n变化,变更,变种,变调 protrude[ pre'tru:dv突出,伸出 dudA]变迟钝;a迟钝的,不鲜明的,无光泽的 readily [red而]ad容易,欣然,乐意地
cutaway ['kʌtwei] a.切去一部分的，剖面的 instantly ['instæntli] ad.立即地，即刻地 variation [veəri'ei∫ən]n.变化，变更，变种，变调 protrude [prə'tru:d] v.突出，伸出 dull [dʌl] v.变迟钝；a.迟钝的，不鲜明的，无光泽的 readily ['redili] ad.容易，欣然，乐意地
PHRASES AND EXPRESSIONS water separator(油)水分离器 inline injector pump直列式喷油泵 delivery valve出油阀 segment gear扇形齿轮 transfer pump输送泵,输油泵 inline fuel pump管路串接式燃油泵 inward opening injector孔式喷油器 outward opening injector轴针式喷油器 glow plug预热塞 pumping chamber预压缩室(腔) wire mesh(金属、钢、塑料)丝网,线网
water separator （油）水分离器 inline injector pump 直列式喷油泵 delivery valve 出油阀 segment gear 扇形齿轮 transfer pump 输送泵，输油泵 inline fuel pump 管路串接式燃油泵 inward opening injector 孔式喷油器 outward opening injector 轴针式喷油器 glow plug 预热塞 pumping chamber 预压缩室（腔） wire mesh （金属、钢、塑料）丝网，线网 PHRASES AND EXPRESSIONS
Overview of Diesel Fuel Injection Diesel engines are used on some cars and light truckS. The diesel engine uses the heat of compression instead of a spark plug, to ignite the fuel. Diesel fuel injection is similar to gasoline injection, but requires higher injection pressures. Air is drawn into the cylinder and highly compressed. The compression is so high that the compressed air will reach temperatures of 1000F(538.2.C). At the precise time the piston has completed the compression stroke diesel fuel is sprayed into the combustion chamber, or an offset prechamber. The intense heat of the compressed air ignites the fuel, and the power stroke follows Overall Diesel Fuel System A schematic of a diesel fuel system layout is shown in Fig 5-1 ypical diesel system components include the tank, fuel pump filter, injection pump, injectors, and the necessary fuel lines. The system in Fig 5-1 is typical of newer systems that utilize a computer-controlled electronic fuel injection pump
Overview of Diesel Fuel Injection Diesel engines are used on some cars and light trucks. The diesel engine uses the heat of compression, instead of a spark plug, to ignite the fuel. Diesel fuel injection is similar to gasoline injection, but requires higher injection pressures. Air is drawn into the cylinder and highly compressed. The compression is so high that the compressed air will reach temperatures of 1000℉(538.2℃). At the precise time the piston has completed the compression stroke, diesel fuel is sprayed into the combustion chamber, or an offset prechamber. The intense heat of the compressed air ignites the fuel, and the power stroke follows. Overall Diesel Fuel System A schematic of a diesel fuel system layout is shown in Fig.5-1. Typical diesel system components include the tank, fuel pump, filter, injection pump, injectors, and the necessary fuel lines. The system in Fig.5-1 is typical of newer systems that utilize a computer-controlled electronic fuel injection pump
江GAGE FUEL FUEL FILTER ELECTRONIC SUPPLY FUEL INJECTION LINE PUMP FUEL TANK SOLENOID FEUL SENDER FUEL PUMP FUEL INJECTOR FUEL RETURN LINE Fig 5-1. An overall view of one particular diesel fuel injection system as used with a V-8 engine
Fig.5-1. An overall view of one particular diesel fuel injection system as used with a V-8 engine
Water In Fuel sensor Some vehicles are equipped with a water in fuel sensor that will alert the driver to the fact that water is present in the fuel [1]. The water may then be drawn off through a valve in the bottom of a water separator. Water is extremely damaging to the injection system Fuel filter Diesel fuel must be kept clean to avoid injector system trouble. Very small particles are enough to clog injector nozzles or jam the injector. Diesel fuel systems typically use one or more filters to trap dirt and other deposits Diesel Injection Pump Diesel fuel is injected directly into the cylinder at the top of the compression stroke. Due to the high compression(around 22: 1)used in diesel engines, the diesel injection pump must be capable of producing high pressures. Injector pump pressures vary greatly depending on the pump and engine. Pressures can range from 3000-15,000 psi(20 685-103 425 kPa)
Water In Fuel Sensor Some vehicles are equipped with a water in fuel sensor that will alert the driver to the fact that water is present in the fuel [1]. The water may then be drawn off through a valve in the bottom of a water separator. Water is extremely damaging to the injection system. Fuel Filter Diesel fuel must be kept clean to avoid injector system trouble. Very small particles are enough to clog injector nozzles or jam the injector. Diesel fuel systems typically use one or more filters to trap dirt and other deposits. Diesel Injection Pump Diesel fuel is injected directly into the cylinder at the top of the compression stroke. Due to the high compression (around 22:1) used in diesel engines, the diesel injection pump must be capable of producing high pressures. Injector pump pressures vary greatly depending on the pump and engine. Pressures can range from 3000-15,000 psi (20 685-103 425 kPa)
How the Injector Pump Produces Pressure By using a plunger operating in a cylinder, the pump traps fuel ahead of the plunger. When the plunger is forced up, it builds pressure on the fuel Pressure will be increased to the point at which the injector will open and spray fuel into the engine Pumps can use a single plunger for each injector or a single pump(often consisting of two or more opposing plungers )to serve all injectors[2] Injector Pump Types There are a number of injector pump designs. The most commonly used automobile and light truck diesel injector pumps are classified as inline or distributor both are mechanical pumps that pressurize the fuel and deliver it to the cylinders at the proper time for each Inline Injector Pump
How the Injector Pump Produces Pressure By using a plunger operating in a cylinder, the pump traps fuel ahead of the plunger. When the plunger is forced up, it builds pressure on the fuel. Pressure will be increased to the point at which the injector will open and spray fuel into the engine. Pumps can use a single plunger for each injector or a single pump (often consisting of two or more opposing plungers) to serve all injectors[2]. Injector Pump Types There are a number of injector pump designs. The most commonly used automobile and light truck diesel injector pumps are classified as inline or distributor. Both are mechanical pumps that pressurize the fuel and deliver it to the cylinders at the proper time for each. Inline Injector Pump