Darren Wu wrote:
帳面上的馬力與扭力...(恕刪)
Sorry 沒說清楚
根據報導 這個引擎搭載在B9 A4上才有整體結果
新世代B9 A4也上了輕量化技術(少100kg) 對油耗幫助也很大
柴油還是有它的優勢在... 車體輕量化 油耗會更好
hbd wrote:
汽油吃得少就怕機油討...(恕刪)
我的2013年生產的A6 2.0T 每10000公里保養 機油尺掉1/5 200cc
現在已跑50000公里了 都是這樣 算正常了吧
你的還有嘛?
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blhsing wrote:
我稍微讀了一下這顆...(恕刪)
不知道, 是英文 or 技術有問題..還是外行人來解釋內行人的問題.....差太多了吧...
Audi 提高壓縮比的,高效率稀薄燃燒.....比起..偷馬力的 Atkinson cycle.用降低壓比, 降低燃燒效率是兩碼事吧...
Modern Atkinson cycle engines[edit]
A small engine with Atkinson-style linkages between the piston and flywheel. Modern Atkinson cycle engines do away with this complex energy path.
Recently, the term "Atkinson cycle" has been used to describe a modified Otto cycle engine in which the intake valve is held open longer than normal to allow a reverse flow of intake air into the intake manifold. The effective compression ratio is reduced (for a time the air is escaping the cylinder freely rather than being compressed) but the expansion ratio is unchanged. This means the compression ratio is smaller than the expansion ratio. Heat gained from burning fuel increases the pressure, thereby forcing the piston to move, expanding the air volume beyond the volume when compression began. The goal of the modern Atkinson cycle is to allow the pressure in the combustion chamber at the end of the power stroke to be equal to atmospheric pressure; when this occurs, all the available energy has been obtained from the combustion process. For any given portion of air, the greater expansion ratio allows more energy to be converted from heat to useful mechanical energy meaning the engine is more efficient.
The disadvantage of the four-stroke Atkinson cycle engine versus the more common Otto cycle engine is reduced power density. Due to a smaller portion of the compression stroke being devoted to compressing the intake air, an Atkinson cycle engine does not take in as much air as would a similarly designed and sized Otto cycle engine.
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suarthur wrote:我想是你的英文閱讀或理解能力有問題。Audi自己在官方新聞稿裡都說這顆新引擎的重點是採用「與Miller cycle相同概念」的技術了，只差沒有使用Miller cycle的機械增壓，而使用Miller cycle卻沒有使用機械增壓就是使用Atkinson cycle。
不知道, 是英文 or 技術有問題..還是外行人來解釋內行人的問題.....差太多了吧...
Audi 提高壓縮比的,高效率稀薄燃燒.....比起..偷馬力的 Atkinson cycle.用降低壓比, 降低燃燒效率是兩碼事吧...
Audi文宣："The breakthrough of the 2.0 TFSI lies in a new combustion method. At its core its principle is comparable to the Miller cycle."
Atkinson cycle:
http://en.wikipedia.org/wiki/Atkinson_cycle
"Four-stroke engines of this type that use the same type of intake valve motion but with a supercharger to make up for the loss of power density are known as Miller cycle engines."
Miller cycle:
http://en.wikipedia.org/wiki/Miller_cycle#Atkinson_cycle_engine
"A similar delayed-valve closing method is used in some modern versions of Atkinson cycle engines, but without the supercharging."
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