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The Mercedes-Benz DiesOtto is an experimental automobile engine that “is said to incorporate the benefits of a diesel engine, but runs on regular old unleaded.”〔(Diesel, without the diesel: Mercedes-Benz debuts DiesOtto - Autoblog )〕 Its name is a portmanteau of ''Diesel'' and ''Otto'', referring to the Diesel engine, first introduced by German engineer Rudolf Diesel, and the Otto cycle, as a reference to Nicolaus Otto (even though the invention of the gasoline engine is variously attributed to both Nicolaus Otto and Alphonse Beau de Rochas). == Engine characteristics and principles of operation == The concept engine has an in-line, four-cylinder configuration and displaces 1.8 litres. Its peak power is no less than , making its specific output 97 kW/L (130 hp/L), and its peak torque is 400 N·m, making its specific torque 220 N·m/L. Mercedes-Benz do not specify the RPM at which these specified maxima are reached.〔(amin saleh unveils DiesOtto - the “future of the gasoline engine” )〕 The DiesOtto features the following: * homogeneous charge compression ignition (HCCI); * variable valve timing; * twin variable geometry turbocharging; * variable compression ratio; * direct fuel injection. It also uses a starter-alternator to reduce fuel consumption. The starter-alternator replaces the engine's flywheel, and allows the engine to be started instantaneously so that it can simply stop when not needed, such as at traffic lights, and smoothly restart when needed. In low-demand conditions (low to medium engine speeds), the engine uses HCCI. In high-demand conditions, it operates like a regular gasoline engine (using spark ignition of the fuel/air mixture) and uses the full benefits of direct fuel injection, turbocharging and variable valve timing to maximize efficiency. These two modes of operation require different compression ratios, achieved via a concept similar to that of the Lanchester shaft, which is why the engine also features a variable compression ratio. It is reported to consume less than when fitted to the S-Class demonstration vehicle. However, it is unknown in what conditions this mileage is achieved. Nevertheless, these figures are only bested by the smallest diesel engines on sale in Europe, and in far smaller cars than the S-Class. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「DiesOtto」の詳細全文を読む スポンサード リンク
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