TDI is a registered trademark of Volkswagen AG [ 1 ] . TDI是一個註冊商標的大眾汽車公司[ 1 ] 。
The engine uses direct injection , where a fuel injector sprays atomised fuel directly into the main combustion chamber of each cylinder, rather than the pre-combustion chamber prevalent in older diesels which used indirect injection .該引擎採用直接噴射 ，在噴油器燃油噴射atomised的主要直接進入燃燒室的每個氣缸，而不是預先燃燒室中普遍存在老年人柴油使用間接注射 。 The engine is coupled with a turbocharger to increase the amount of air going into the engine cylinders, and an intercooler to lower the temperature (and therefore increase the density ) of the air from the turbo, thereby increasing the amount of fuel that can be injected and combusted.發動機加上渦輪增壓器 ，以增加空氣進入發動機氣缸，和一個冷卻器 ，以降低溫度（並因此增加密度 ）的空氣從渦輪增壓，從而增加了數量的燃料，可注射和燃燒。 These, in combination, allow for greater engine performance (from a more complete combustion process compared to indirect injection), while also decreasing emissions and providing more torque than its petrol engined counterpart.這些結合，允許更大的發動機性能（從更完整的燃燒過程相比，間接注射） ，同時減少排放量，並提供更大的扭矩比汽油發動機的對應。
Similar technology has been used by other companies but "TDI" refers to these Volkswagen Group engines.類似的技術已經被其他公司使用，但“貿發指數”是指這些大眾汽車集團發動機。 Normally-aspirated engines (those without a turbocharger) made by Volkswagen Group use the label Suction Diesel Injection (SDI).通常吸氣引擎（那些沒有渦輪增壓器）由大眾汽車集團使用標籤吸入柴油噴射 （ SDI公司） 。
The reduced material volume of the direct injection diesel engine reduces heat losses, and thereby increases engine efficiency , at the expense of increased combustion noise.減少材料量的直噴式柴油機降低熱損失，從而增加發動機的效率 ，以犧牲更多的燃燒噪聲。 A direct injection engine is also easier to start when cold, due to more efficient placing and usage of glowplugs .直噴發動機也容易冷啟動時，由於更有效地與使用glowplugs 。
History
The first Volkswagen Group TDI engine was a 2.5L inline five-cylinder introduced in the Audi 100 in 1989.大眾汽車集團的第一TDI發動機是2.5L 直列五缸引進奧迪100在1989年。 The TDI arrangement has been enhanced by improving the efficiency of the turbocharger, increasing the pressure at which fuel can be injected, and more precisely timing when the injection of fuel takes place.了TDI安排加強了提高其效率的渦輪增壓器，增加了壓力，而燃料可注射，和更準確的時間時，注射燃料發生。 There have been a few major generations, starting with what are known as "VE" engines.有一些重大的後代，從所謂的“虛擬企業”的引擎。 In 2000, the Pumpe Düse (PD, variously translated "pump nozzle", "unit injector", "pump injector") engine began to appear in Europe , eventually coming to North America a few years later. 2000年， 泵諾拉杜絲 （鈀，各種翻譯“泵噴嘴” ， “單位注射器” ， “泵噴嘴” ）引擎開始出現在歐洲 ，最終來到北美洲幾年之後。
The PD design was a reaction to the development of common rail fuel injection by competitors - an attempt by Volkswagen Group to create an in-house technology of comparable performance that would not require any royalties to be paid. [ citation needed ] While Pumpe-Düse engines had a significantly higher injection pressure than older engines, they are not a match with the very latest common rail, [ citation needed ] and weren't able to control injection timing as precisely (a major factor in improving emissions). [ citation needed ] New engines appearing in 2009 model year Volkswagens are using the common-rail technique with piezoelectric injectors.帕金森病是一種反應設計的發展共軌燃油噴射的競爭對手-試圖通過大眾汽車集團建立了一個內部技術的性能，不會要求任何版稅支付。 [ 引文需要 ]雖然泵-諾拉杜絲發動機有一個顯著高於注射壓力比年長發動機，它們是不是符合最新的共軌， [ 引文需要 ]和無法控制噴油定時準確（一個主要因素，改善排放量） 。 [ 引文需要 ]新引擎出現在2009年大眾汽車使用的是共軌技術， 壓電式噴射器
~ from 維基百科
