第一篇：无人机的中英文对照
Unmanned Aerial Vehicle(UAV)
无人驾驶飞机
An unmanned aerial vehicle(UAV), commonly known as a drone, is an aircraft without a human pilot onboard.Its flight is either controlled autonomously by computers in the vehicle, or under the remote control of a navigator, or pilot(in military UAVs called a Combat Systems Officer on UCAVs)on the ground or in another vehicle.无人驾驶飞机,俗称无人机,即无需驾驶员在机内驾驶的飞机。其飞行时接受的并不是机内电脑的自动控制，也不是导航员的远程控制，更不是来自地面或另一飞机上无人作战机指挥官的控制.There are a wide variety of drone shapes, sizes, configurations, and characteristics.Historically, UAVs were simple remotely piloted aircraft, but autonomous control is increasingly being employed.无人机种类繁多,在外形、大小、结构和性能上各有千秋。过去无人驾驶飞机只是简单的远程人工驾驶飞机，而现在越来越多的的无人机都采用了自动控制驾驶。
Their largest use is within military applications.UAVs are also used in a small but growing number of civil applications, such as firefighting or nonmilitary security work, such as surveillance of pipelines.UAVs are often preferred for missions that are too “dull, dirty, or dangerous” for manned aircraft.无人机最广泛地运用于军事领域，在民用领域，如消防事业或管道监控这样的非军事保障工作中也占有小额比重，并有所增长。对载人飞机来说，那些“无聊、肮脏或危险的”任务，就可以利用无人机来执行。
History
The earliest attempt at a powered unmanned aerial vehicle was A.M.Low's “Aerial Target” of 1916.Nikola Tesla described a fleet of unmanned aerial combat vehicles in 1915.A number of remote-controlled airplane advances followed, including the Hewitt-Sperry Automatic Airplane, during and after World War I, including the first scale RPV(Remote Piloted Vehicle), developed by the film star and model airplane enthusiast Reginald Denny in 1935.More were made in the technology rush during World War II;these were used both to train antiaircraft gunners and to fly attack missions.Jet engines were applied after World War II, in such types as the Teledyne Ryan Firebee I of 1951, while companies like Beechcraft also got in the game with their Model 1001 for the United States Navy in 1955.Nevertheless, they were little more than remote-controlled airplanes until the Vietnam Era.机动无人驾驶飞机最早的开发在1916年 A.M 罗的“空中目标”里。尼古拉·泰斯拉曾于1915年提出建造无人驾驶作战机队的构想。随之而来的是一系列远程控制飞机的进步，如休伊特·斯佩里开发的自动化飞机；在一战期间及其结束后，还有由电影演员、飞机模型爱好者雷金纳德丹尼于1935年研发的第一架远程人工驾驶飞机。二战期间，科学技术迅猛的发展使无人机有了更多的进步，无人机不仅用于训练防空炮手，还用于空中攻击训练。二战结束后，无人机增添了喷气发动机这一配置，这样配置的飞机有泰勒雷恩公司1951年研发的AGM-34火蜂，还有山毛榉飞机公司于1955年为美国海军舰队研发的1001。
The birth of U.S.UAVs(called RPVs at the time)began in 1959 when United States Air Force(USAF)officers, concerned about losing pilots over hostile territory, began planning for the use of unmanned flights.This plan became intensified when Francis Gary Powers and his “secret” U-2 were shot down over the Soviet Union in 1960.Within days, the highly classified UAV program was launched under the code name of “Red Wagon.”The August 2 and August 4, 1964, clash in the Tonkin Gulf between naval units of the U.S.and North Vietnamese Navy initiated America's highly classified UAVs into their first combat missions of the Vietnam War.When the “Red Chinese” showed photographs of downed U.S.UAVs via Wide World Photos, the official U.S.response was, “no comment.”
美国无人机（当时称为远程控制飞机）的诞生始于1959，这是由于美国空军指挥官在考虑到反恐行动中的飞行员损伤后，决心使用无人飞行机。1960年在弗兰西斯加里鲍尔斯的U-2 隐形战机苏联击落事件后，这一计划的开展得以加速。数日之内，高度机密的无人机项目便以“红色小马车”为代号开始运行了。1964年8月2号及8月4号，在东京湾爆发的美国海军部门与越南北方海军的冲突事件，即标志着美国高度机密的无人机项目第一次在越战中执行军事任务。而在中国共产党在“世界照片博览”中展示美国无人机的照片后，美国空军方面的回复却是，“无可奉告”。
Only on February 26, 1973, during testimony before the United States House Committee on Appropriations, did the U.S.military officially confirm that they had been utilizing UAVs in Southeast Asia(Vietnam).While over 5,000 U.S.airmen had been killed and over 1,000 more were either missing in action(MIA), or captured(prisoners of war/POW);the USAF 100th Strategic Reconnaissance Wing had flown approximately 3,435 UAV missions during the war, at a cost of about 554 UAVs lost to all causes.In the words of USAF General George S.Brown, Commander, Air Force Systems Command in 1972, “The only reason we need(UAVs)is that we don't want to needlessly expend the man in the cockpit.”Later that same year, General John C.Meyer, Commander in Chief, Strategic Air Command, stated, “we let the drone do the high-risk flying...the loss rate is high, but we are willing to risk more of them...they save lives!”
直到1973年2月26日,美国军方才在美国国会拨款宣言中正式承认对东南亚(越南)使用无人机。而在战争中，超过5000名飞行员被无情杀害，有一千多名飞行员或是失踪，或是被俘；美国空军侦查战略共派遣了约3435架无人机参与战争，由于各种原因，有554架无人机丢失。空军上将乔治 S.布朗，也是197
2年空军系统司令部的指挥官曾说：“我们需要无人机的唯一原因是因为我们不想在战场上有不必要的损伤。”后来，也是在那一年，约翰C.迈耶上将，美国空军战略司令部首席指挥官也发表声明： “我们让无人机去执行那些高风险的飞行任务„„尽管它们的损伤率很高，但我们宁愿冒这些风险„„因为它们拯救的是生命！”
During the 1973 Yom Kippur War, Syrian missile batteries in Lebanon caused heavy damage to Israeli fighter jets.As a result, Israel developed the first modern UAV.Israel pioneered the use of UAVs for real-time surveillance, electronic warfare and decoys.The images and radar decoying provided by these UAVs helped Israel to completely neutralize the Syrian air defenses at the start of the 1982 Lebanon War, resulting in no pilots downed.1973年赎罪日战争期间，叙利亚在黎巴嫩所发射的导弹令以色列喷气式战斗机造成了严重损伤。因此，以色列开发了世界上第一台现代化无人飞行机。以色列首创以无人机担任实时监控任务，开创电子战争以及电子诱饵的先河。这些无人机提供的影响及雷达诱饵使得叙利亚空军在1982年黎巴嫩战争中的作用大打折扣，并且无一名以色列飞行员发生坠机事件。
With the maturing and miniaturization of applicable technologies as seen in the 1980s and 1990s, interest in UAVs grew within the higher echelons of the U.S.military.In the 90s the U.S.Department of Defense began to buy UAVs from Israel.The Navy bought the Pioneer UAV, which is still in use.Many of these Israeli and newly developed U.S.UAVs were used in the 1991 Gulf War.20世纪八九十年代，随着应用型科技的成熟化与微型化，美国军方对无人机的兴趣大幅提升。在90年代，美国国防部开始从以色列采购无人机。美国海军采购的先锋无人机至今仍在使用。其中，许多在以色列购买在美国得以改进，并于海湾战争中使用。
UAVs were seen to offer the possibility of cheaper, more capable fighting machines that could be used without risk to aircrews.Initial generations were primarily surveillance aircraft, but some were armed(such as the General Atomics MQ-1 Predator, which utilized AGM-114 Hellfire air-to-ground missiles).An armed UAV is known as an unmanned combat air vehicle(UCAV).无人机为美国军方提供了成本低廉、极富任务灵活性的战斗机器，使用这样的战斗机器不存在飞行人员伤亡的风险。最初的一代主要以侦察机为主，现在一些无人机已经装备了武器（例如RQ-1捕食者装备了AGM-114地狱火空对地导弹）。由无人机担任更多角色的军事设想，最初是侦察，现在则发展到了空对地攻击。装备有武器的无人机被称为无人驾驶作战飞机（UCAV）。
第二篇：中英文对照A
《美国口语惯用法例句集粹》Ａ
A(Page 1-4)
1.about
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6)
7)I'd like to know what this is all about.我想知道这到底是怎么回事。How about a fish sandwich? 来一块鱼肉三明治怎么样？What about me? 我怎么样？I'm not about to go in that old house.我是不会进那幢旧房子的！Yes I remember that night.What about it? 是的，我记得那个晚上，那又怎样？What's this all about? 这到底是怎么回事？It's about time you showed up!差不多是你该露面的时候了。
2.above
1)
2)Above all, I want everything quiet.首要的是：我要一切保持安定。Tom thinks he's above hard work.汤姆认为自己没必要努力工作。
3.act
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2)
3)
4)
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6)Would you please act out what happened? 你能把发生的事演示一下吗？Watch Ricky.He sometimes likes to act up in class.注意里基，他又是喜欢在课堂上捣蛋。That profane comedian needs to clean up his act.那个爱说粗言秽语的喜剧演员应该净化一下自己的言行。We need to get our act together and come to see you.我们需要统一意见后来见你。The newspapers called the earthquake an act of God.报纸上称那次地震为天灾。Masa is a class act.玛莎是位杰出的女性。
4.action
1)
2)
3)
4)We're going to bring action against our debtors.我们打算控告我们的债务人。Did you see any action in yesterday's ballgame? 昨晚的棒球比赛中你看到有什么有趣的精彩场面吗？Our community is going to take action against the proposed waste dump.我地区要采取行动反对那项垃圾处理场的提案。Jim wants to go where the action is.吉姆想去有刺激性的地方。
5.advantage
1)
2)Our opponents have a height advantage on us.我们的对手在身高上比我们占有优势。Nobody likes to be taken advantage of.没有人喜欢被捉弄（或：被欺骗、利用）
6.after
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2)
3)
4)I think that girl is after you.我想那女孩是在追你。It looks like things are gonna work out after all.看起来事情终会解决的。This soft drink has a nasty aftertaste.这软饮料有种让人难受的余味。I see your point, but don't you think it's way after the fact.我明白你的意思，但你不觉
得这已是“事后诸葛亮”了吗？
7.again
1)I could go to Japan again and again.我可以一而再、再而三地去日本。（注：意指不会感到
厌倦）
8.age
1)
2)Would you please act your age!请你做事要有一个与自己年龄相称的样子。This is a “coming of age” movie.这是一部成人影片。
9.air
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2)
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9)I need to go outside and get some air.我需要出去呼吸点新鲜空气。I don't know what's wrong, but can feel it in the air.虽然我不知道到底是出了什么差错，但我能隐隐约约感觉到。Mike was sad when they took his favorite program off the air.当迈克喜欢的节目被取消时，他感到很伤心。The sale of our house is still up in the air.我们的房子出勤率售一事还没有最后定下来。After winning the championship, I felt I could walk on air.获得冠军后，我飘飘欲仙。Your sister is such an airhead.你姐姐真是来个没有头脑的人。Janet Jackson's new song is getting lots of airplay.珍妮〃杰克逊的新歌到处都在不断地播放。That last time I took a plane, I got airsick.上次我乘飞机时晕机了。I hope there's no bad air between us.我希望我们之间的关系不要很别扭。
10.all
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13)It's looks like we won't be going after all.看起来最后我们还是不能去。We've all but finished the project.我们已几乎完成了那个项目。All in all I'd say it's been a very productive day.总的来说，我认为这一天过得很充实。Let's go all-out and win this game!让我们尽全力来打赢这场比赛。We knew it was all over when we saw the building burst.当我们看见那座建筑突然起火时，我们知道一切全完了。We wish you all the best.我们大家祝福你一切如意。If it's all the same to you, I'd just as soon not go.如果这对你都是一回事的话，我就不想去了。They were running from the police like all get-out.他们以极快的速度逃脱警察的追赶。I didn't see them come in at all.我根本高没有发现他们的进来。Let's settle this matter once and for all.让我们来把这个问题一次性地彻底解决掉。Mark is an all-around athlete.马克是一个全能运动员。Did you get to play in the all-star game? 你入选全明星队的比赛了吗？He bloke the all-time record in the 100-meter run at his school.他打破了他所在的学校
100米跑的历史最高记录。
11.alley
1)Working on cars isn't up my alley.修理汽车不是我拿手的活儿。
12.alone
1)
2)I just wanna be left alone.我只是想一个人呆会儿。Can't you just leave well enough alone? 你不能少管一些闲事吗？
13.along
1)
2)You knew all along what was going on.你从一开始就知道所发生的事。Debbie doesn't get along with Steve.戴比和史蒂夫相处得不好。
1)
2)
3)
4)
5)Mr.Pak came here searching for the American dream.帕克先生来到这儿寻求他的“美国梦”。Some foreigners become Americanized while living in the U.S.一些外国人在美国居住时被美国化了。Not having any job freedom would be totally unAmerican.没有选择职业的自由是完全违背美国精神传统的。Bill is an all-American quarterback.比尔是全美（橄榄球）明星赛的四分卫队员。I just can't go on the American way.我无法适应美国方式。
15.animal
1)
2)Water-skiing really brings out the animal in Tom.滑水运动真正激发出了汤姆的活力与激情。The young actor emits a lot of animal magnetism on the screen.那个年轻演员在荧幕
上充分显示出他的性魅力。
16.answer
1)I called Emi but there was no answer.我给埃米打了电话，但是没人接。
17.apple
1)
2)
3)
4)
5)Have you ever been to the Big Apple? 你去过纽约吗？Do I sense an apple of discord between you two? 你问我有没有感觉出你们两人之间的不和，是吗？Heather is the apple of my eye.希瑟是我的掌上明珠。Rita likes to keep everything in apple-pie order.丽塔喜欢把一切都弄得井井有条。Dennis has always been an apple polisher.丹尼斯一直就是一个马屁精。
18.arm
1)
2)
3)
4)You don't have to twist my arm to get me to go with you.用不着你强迫我跟你走。My father is a hopeless armchair quarterback.我爸爸是一个没救了的纸上谈兵的人。The suspects are armed and dangerous.嫌疑犯带有武器，十分危险。Every spring the park is filled with lovers walking arm in arm.每到春天公园里到处都是
手挽手散步的恋人。
19.around
1)
2)Coach Johnson has been around for 30 years.约翰逊教练已有三十年的经验了。Someone is on duty here around-the-clock.有人在这里昼夜值班。
20.as
1)
2)
3)
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6)It looks as if someone has already been here.看起来在人来过这里了。As for me, I'm going home.至于我，我准备回家。Marty is acting as if nothing happened.马蒂表现得像什么也没发生过一样。I want this room left as is.我希望这间房子保持原样。The changes will begin taking place as of tomorrow.变动从明天开始实施。Police are baffled as to the whereabouts of the kidnappers.警察局搜寻绑架者的工作受
挫。
1)
2)
3)
4)Our gas bill average about $50 a month.我们每个月的煤气费平均50美元。On the average, I'd say we eat chicken once a week.我们平均每周吃一次鸡肉。Kent describes himself as just an average Joe.肯特视自己为一名普通的美国人。On the average day, over 100,000 kids bring guns to school in the U.S.在美国平常日
子里，有100,000个孩子带手枪去上学。
22.away
1)
2)
3)
4)
5)What makes you think you're gonna get away with this? 是什么使你认为你可以免受处罚？I wish they'd do away with these complicated tax forms.我希望他们能费除掉这些复杂的税务表格。We're planning a weekend getaway for our anniversary.我们正在为庆祝我们的纪念日而安排一次周末的外出活动。Tom wants to run away from home.汤姆想从家里出逃。Dave and Kathy are going to steal away on vacation.戴夫和凯茜计划在假期里偷偷跑出
去。
第三篇：中英文对照
AEROFLEX “亚罗弗”保温 ALCO “艾科”自控 Alerton 雅利顿空调 Alfa laval阿法拉伐换热器 ARMSTRONG “阿姆斯壮”保温 AUX 奥克斯
BELIMO 瑞士“搏力谋”阀门 BERONOR西班牙“北诺尔”电加热器 BILTUR 意大利“百得”燃烧器 BOSIC “柏诚”自控 BROAD 远大
Burnham美国“博恩汉”锅炉 CALPEDA意大利“科沛达”水泵 CARLY 法国“嘉利”制冷配件 Carrier 开利 Chigo 志高
Cipriani 意大利斯普莱力
CLIMAVENETA意大利“克莱门特” Copeland“谷轮”压缩机 CYRUS意大利”赛诺思”自控 DAIKIN 大金空调
丹佛斯自控 Dorin “多菱”压缩机
DUNHAM-BUSH 顿汉布什空调制冷 DuPont美国“杜邦”制冷剂 Dwyer 美国德威尔 EBM “依必安”风机
ELIWELL意大利“伊力威”自控 Enfinilan 英国“英菲尼兰“阀门 EVAPCO美国“益美高”冷却设备 EVERY CONTROL意大利“美控” Erie 怡日
FRASCOLD 意大利“富士豪”压缩机 FRICO瑞典“弗瑞克”空气幕 FUJI “富士”变频器
FULTON 美国“富尔顿”锅炉 GENUIN “正野”风机 GREE 格力
GREENCOOL格林柯尔 GRUNDFOS “格兰富”水泵 Haier 海尔 Hisense 海信 HITACHI 日立
霍尼韦尔自控 Johnson 江森自控 Kelon 科龙
KRUGER瑞士“科禄格”风机 KU BA德国“库宝”冷风机 Liang Chi 良机冷却塔 LIEBERT 力博特空调 MARLEY “马利”冷却塔 Maneurop法国“美优乐”压缩机 McQuary 麦克维尔 Midea 美的 MITSUBISHI三菱
Munters 瑞典“蒙特”除湿机 Panasonic 松下 RANCO “宏高”自控
REFCOMP意大利“莱富康”压缩机 RIDGID 美国“里奇”工具 RUUD美国“路德”空调 RYODEN “菱电”冷却塔 SanKen “三垦”变频器 Samsung 三星 SANYO 三洋
ASWELL英国森威尔自控 Schneider 施耐德电气 SenseAir 瑞典“森尔”传感器 SIEMENS 西门子
SINKO ",28商机网;新晃“空调 SINRO “新菱”冷却塔 STAND “思探得”加湿器 SWEP 舒瑞普换热器 TECKA “台佳”空调 Tecumseh“泰康”压缩机 TRANE 特灵
TROX德国“妥思”风阀 VASALA芬兰“维萨拉”传感器 WILO德国“威乐”水泵 WITTLER 德国”威特”阀门 YORK 约克
ZENNER德国“真兰”计量
第四篇：中英文对照
医院中英文对照
发热门诊Have Fever主治医师Doctor-in-charge 供应室Supply Room谢绝入内No entering 红灯亮时谢绝入内No entering when red light
彩超、心电图Colorful Cardiogram/ECG住院楼Inpatient Building 透析血磁EndoscopeDept.护士Nueser康复理疗科RehabilitationPhysiotherapyDept.中药计价China medical price account肛肠科Ano-proctology
皮肤、肛肠、男性科、泌尿科候诊Dermatology、Ano-proctology、male Urology Clinic 皮肤科、肛肠科、男性科、泌尿科Dermatology、Ano-proctology、male Urology Dept 中医科Traditional Chinese Medicine五官科ENT Dept.男性科、泌尿科 Male urology Dept.安全出口Exit
预防保健科Medical center for health preventionand care
后勤科、药库Logistic Room、Seore入院登记In-patient Admisson 高压氧治疗Hyperbaric Oxygehation Therapy碎石中心ESWL Center 急救中心Emergency Center挂号收费Registration
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共轨技术
随着人们对低油耗、低废气排放、发动机低噪声的需求越来越大，对发动机和燃油喷射系统的要求也越来也高。对柴油发动机燃油喷射系统提出的要求也在不断增加。更高的压力、更快的开关时间，以及根据发动机工况修订的可变的流量速率曲线，已经使得柴油发动机具有良好的经济性、低污染、高动力性，因此柴油发动机甚至进入了豪华高性能轿车领域。达到这些需求的前提是拥有一个可以精确雾化燃油并具有高喷油压力的燃油喷射系统。同时，喷油量必须精确计算，燃油流量速率曲线必须有精确的计算模型，预喷射和二次喷射必须能够完成。一个可以达到以上需求的系统即共轨燃油喷射系统。
共轨系统包括以下几个主要的部分： ①低压部分，包含燃油共轨系统组件。
②高压系统，包含高压泵、油轨、喷油器和高压油管等组件。
电控柴油机系统EDC主要由系统模块，如传感器、电子控制单元和执行机构组成。共轨系统的主要部分即喷油器。它们拥有一个可以快速开关喷嘴的执行阀(电磁阀或压电触发器)，这就允许对每个气缸的喷射进行控制。
所有的喷油器都由一个共同的油轨提供燃油，这就是“共轨”的由来。在共轨燃油喷射系统中，燃油喷射和压力的产生是分开的。喷油压力的产生与发动机转速和喷油量无关。EDC控制每个组件。
(1)压力产生。
燃油喷射和压力的产生是通过蓄能器分离开来。将具有压力的燃油提供给为喷射做好准备的共轨系统的蓄能器。
由发动机驱动的连续运转的高压泵提供所需喷油的压力。无论发动机的转速高低，还是燃油喷射量的多少，油轨中的压力均维持在一定值。由于几乎一致的喷油方式，高压泵的设计可以小的多，而且它的驱动转矩可以比传统燃油喷射系统低，这源于高压泵的负载很小。
高压泵是径向活塞泵，在商用车上有时会使用内嵌式喷油泵。(2)压力控制
所应用的压力控制方法主要取决于系统。
一种控制油轨压力的方式是通过一个压力控制阀对高压侧进行控制。不需喷射的燃油通过压力控制阀流回到低压回路。这种控制回路允许油轨压力对不同工况(如负载变化时)迅速做出反应。
在第一批共轨系统中采用了对高压侧的控制。压力控制阀安装在燃油轨道上更可取，但是在一些应用中，它被直接安装在高压泵中。
另一种控制轨道压力的方式是进口端控制燃油供给。安装在高压泵的法兰上的计量单元保证了泵提供给油轨精确的燃油量，以维持系统所需要的喷油压力。
发生故障时，压力安全阀防止油轨压力超过最大值。
在进口端对燃油供给的控制减少了高压燃油的用量，降低了泵的输入功率。这对燃油消耗起到积极的作用。同时，流回油箱的燃油温度与传统高压侧控制的方法相比得到了降低。
双执行器系统也是一种控制轨道压力的方式，它通过计算单元对压力进行控制，并且通过压力控制阀对高压端进行控制，因此同时具备高压侧控制与进口端燃料供给控制的优势。
(3)燃油喷射
喷油器直接将燃料喷到发动机的燃烧室。它们由与燃油轨道直接相连的短高压油轨提供燃油。发动机的控制单元通过与喷油器结合在一起的控制阀的开闭控制喷油嘴的开关。
喷油器的开启时间和系统油压决定了燃油供给量。在恒压状态下，燃油供给量与电磁阀的开启时间成正比，因此与发动机或油泵的转速(以时间为计量的燃油喷射)无关。
(4)液压辅助动力
与传统燃油喷射系统相比，将压力的产生与燃油的喷射分离开来，有利于燃烧室的充分燃烧。燃油喷射压力在系统中基本可以自主选择。目前最高燃油压力为1600巴，将来会达到1800巴。
共轨系统通过引入预喷射或多次喷射可以进一步减少废气排放，也能明显降低燃烧噪声。通过多次触发高速转换阀的开闭可以在每个喷射周期内实现多达5次的喷射。喷油针阀的开闭动作是液压辅助元件助力的，以保证喷射结束的快速性。
(5)控制和调节
发动机的控制单元通过传感器检测加速踏板的位置以及发动机和车辆的当前工况。采集到的数据包括：
① 曲轴转速和转角； ② 燃油轨道的压力； ③ 进气压力；
④ 进气温度、冷却液温度和燃油温度； ⑤ 进气量； ⑥ 车速等。
电控单元处理输入信号。与燃烧同步，电控单元计算施加给压力控制阀或计算模块、喷油器和其他执行机构(如EGR阀，废气涡轮增压器)的触发信号。
喷油器的开关时间应很短，采用优化的高压开关阀和专业的控制系统即可实现。
根据曲轴和凸轮轴传感器的数据，对照发动机状态(时间控制)，角度/时间系统调节喷油正时。电控柴油机系统(EDC)可以实现对燃油喷射量的精确计算。此外，EDC还拥有额外的功能以进一步提高发动机的响应特性和便利性。
其基本功能包括对柴油燃油喷射正时的精确控制，和在给定压力下对油量的控制。这样，它们就保证了柴油发动机具有能耗低、运行平稳的特点。
其他开环和闭环控制功能用于减少废气排放和燃油消耗，或提供附加的可靠性和便利性，具体例子有：
① 废气在循环控制； ② 增压控制； ③ 巡航控制；
④ 电子防盗控制系统等。(6)控制单元结构。
由于发动机控制单元通常最多有8个喷油器输出口，所以超过八缸的发动机需要两个控制单元。它们通过内置高速CAN网络的“主/从”接口进行连接，因此也拥有较高的微控制器处理能力。一些功能被 分配给某个特定的控制单元(如燃料平衡控制)，其功能根据需求情况(如检测传感器信号)可以动态地分配给一个或多个控制单元。
The Common Rail Calls for lower fuel consumption, reduced exhaust-gas emission, and quiet engines are making greater demands on the engine and fuel-injection system.The demands placed on diesel-engine fuel-injection systems are continuously increasing.Higher pressures, faster switching times, and a variable rate-of-discharge curve modified to the engine operating state have made the diesel engine economical, clean, and powerful.As a result, diesel engines have even entered the realm of luxury-performance sedans.These demands can only be met by a fuel-injection pressure.At the same time the injected fuel quantity must be very precisely metered, and the rate-of-discharge curve must have an exact shape, and pre-injection and secondary injection must be performable.A system that meets these demands is the common-rail fuel-injection system.The main advantage of the common-rail system is its ability to vary injection pressure and timing over a broad scale.This was achieved by separating pressure generation(in the high-pressure pump)from the fuel-injection system(injection).The rail here acts as a pressure accumulator.Principle of the Common Rail The common-rail system consists of the following main component groups: ① The low-pressure stage, comprising the fuel-supply system components;② The high-pressure system, comprising components such as the high-pressure pump, fuel-rail, injector, and high-pressure fuel lines.The electronic diesel control(EDC), consisting of system modules, such as sensors, the electronic control unit, and actuators.The key components of the common-rail system are the injectors.They are fitted with a rapid-action valve(solenoid valve or piezo-triggered actuator)which opens and closes the nozzle.This permits control of the injection process for each cylinder.All the injectors are fed by a common fuel rail, this being the origin of the term “common rail”.In the common-rail fuel-injection system, the function of pressure generation and fuel injection are separate.The injection pressure is generated independent of the engine speed and the injected fuel quantity.The electronic diesel control(EDC)controls each of the components.(1)Pressure Generation.Pressure generation and fuel injection are separated by means of an accumulator volume.Fuel under pressure is supplied to the accumulator volume of the common
rail ready for injection.A continuously operating high-pressure pump driven by the engine produces the desired injection pressure.Pressure in the fuel rail is maintained irrespective of engine speed or injected fuel quantity.Owing to the almost uniform injection pattern, the high-pressure pump design can be much smaller and its drive-system torque can be lower than conventional fuel-injection systems.This results in a much lower load on the pump drive.The high-pressure pump is a radial-piston pump.On commercial vehicles, an in-line fuel-injection pump is sometimes fitted.(2)Pressure Control The pressure control method applied is largely dependent on the system.One way of controlling rail pressure is to control the high-pressure side by a pressure-control valve.Fuel not required for injection flows back to the low-pressure circuit via the pressure-control valve.This type of control loop allows rail pressure to react rapidly to changes in operating point(e.g.in the event of load changes).Control on the high-pressure side was adopted on the first common-rail systems.The pressure-control valve is mounted preferably on the fuel rail.In some applications, however, it is mounted directly on the high-pressure pump.Another way of controlling rail pressure is to control fuel delivery on the suction side.The metering unit flanged on the high-pressure pump makes sure that the pump delivers exactly the right quantity of fuel rail in order to maintain the injection pressure required by the system.In a fault situation, the pressure-relief valve prevents rail pressure from exceeding a maximum.Fuel-delivery control on the suction side reduces the quantity of fuel under high pressure and lowers the power input of the pump.This has a positive impact on fuel consumption.At the same time, the temperature of the fuel flowing back to the fuel tank is reduced in contrast to the control method on the high-pressure side.The two-actuator system is also a way of controlling rail pressure, which combines pressure control on the suction side via the metering unit and control on the high-pressure side via the pressure-control valve, thus marrying the advantages of high-pressure-side control and suction-side fuel-delivery control.(3)Fuel Injection.The injectors spray fuel directly into the engine’s combustion chambers.They are supplied by short high-pressure fuel lines connected to the fuel rail.The engine control unit controls the switching valve integrated in the injector to open and close
the injector nozzle.The injector opening times and system pressure determine the quantity of fuel delivered.At a constant pressure, the fuel quantity delivered is proportional to the switching time of the solenoid valve.This is, therefore, independent of engine or pump speed(time-based fuel injection).(4)Potential Hydraulic Power.Separating the functions of pressure generation and fuel injection opens up future degrees of freedom in the combustion process compared with conventional fuel-injection systems;the injection pressure at pressure at present is 160 MPa;in future this will rise to 180 MPa.The common-rail system allows a future reduction in exhaust-gas emissions by introducing pre-injection events or multiple injection events and also attenuating combustion noise significantly.Multiple injection events of up to five per injection cycle can be generated by triggering the highly rapid-action switching valve several times.The nozzle-needle closing action is hydraulically assisted to ensure that the end of injection is rapid.(5)Control and Regulation.The engine control unit detects the accelerator-pedal position and the current operating states of the engine and vehicle by means of sensors.The data collected includes:
① Crankshaft speed and angle;② Fuel-rail pressure;③ Charge-air pressure:
④ Intake air, coolant temperature, and fuel temperature: ⑤ Air-mass intake: ⑥ Road speed, etc.The electronic control unit evaluates the input signals.In sync with combustion, it calculates the triggering signals for the pressure-control valve or the metering unit, the injectors, and the other actuators(e.g.the EGR valve, exhaust-gas turbocharger actuators, etc.).The injector switching times, which need to be short, are achievable using the optimized high-pressure switching valves and a special control system.The angle/time system compares injection timing, based on data from the crankshaft and camshaft sensors, with the engine state(time control).The electronic diesel control(EDC)permits a precise metering of the injected fuel quantity.In
addition, EDC offers the potential for additional functions that can improve engine response and convenience.The basic functions involve the precise control of diesel-fuel injection timing and fuel quantity at the reference pressure.In this way, they ensure that the diesel engine has low consumption and smooth running characteristics.Additional open-and close-loop control functions perform the tasks of reducing exhaust-gas emissions and fuel consumption, or providing added safely and convenience.Some examples are:
① Control of exhaust-gas recirculation;② Boost-pressure control;③ Cruise control;
④ Electronic immobilizer, etc.(6)Control Unit Configuration.As the engine control unit normally has a maximum of only eight output stages for the injectors, engines with more than eight cylinders are fitted with two engine control units.They are coupled within the “ master/slave ” network via an internal, high-speed CAN interface.As a result, there is also a high microcontroller processing capacity available.Some functions are permanently allocated to a specific control unit(e.g.fuel-balancing control).Other can be dynamically allocated to one or many of the control units as situation demand(e.g.to detect sensor signals).
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