meridian wrote:
為什麼不是?
有人規定一定要曲軸轉一圈完成進壓爆排才是阿金森循環嗎?
那Mazda轉子引擎曲軸轉半圈就可以完成進壓爆排, 是不是奧圖循環??...(恕刪)
不是阿特金森就不是阿特金森~
把轉子引擎拉進來扯搞烏賊混，6AR-FE 也不會成真正的阿特金森循環!
就如 大金空調，真的是日本第一嗎?
男主角竟然是松江路大樓的高層長官咧!
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sunlight_huang wrote:
不是阿特金森就不是阿特金森~
把轉子引擎拉進來扯搞烏賊混，6AR-FE 也不會成真正的阿特金森循環!
就如 大金空調，真的是日本第一嗎?
男主角竟然是松江路大樓的高層長官咧!
以下是維基百科對現代阿特金森循環的定義，米勒引擎就是掛個渦輪，用自創觀點去硬坳公認的事實，毫無理性也沒有意義。
至於大金空調在全球官網宣稱是世界第一，是不是日本第一我就不清楚了，不過人家現在台灣也只有宣稱他是全球第一，你也不用急著扣他帽子。
Modern Atkinson cycle engines
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.
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.
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sunlight_huang wrote:
哈哈，您都說出了! 四行程結構引擎奧圖循環膨脹比等于壓縮比不可變!
利用閥門動作回吐吸氣來降低壓縮比假裝成 阿特金森循環?
所以 四千轉的6AR算是 1.9引擎扭力才會輸 2.0舊引擎，到4700rpm 的扭力峰值也沒有壓縮比 12 引擎的表現!
車商如何說，你們就如何信吧! 模擬跟假裝是沒差的!
當然有差啊, 你所謂的"假的"效率比真的還高, 所以真的根本沒人用
有啦, honda有一個紙上談兵階段的EXLink engine
前面有講了, 推回部分空氣回歧管, 可以減少歧管真空, 減少低轉速時的pumping loss, 增加低轉速時引擎效率
這是一舉數得的做法, 並不是什麼假的就可以"一言以棄之", 不過你可能鴨子聽雷吧
