Gasoline Direct Injection engine (GDI and TGDI) - what is it, what does it promise and what are its drawbacks? - paultan.org
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【直接噴射 省油引擎性能高】GDI缸內直噴引擎 為了節能，並在不降低燃油效率的情況下，能有更大的動力輸出，於是GDI缸內直噴引擎誕生了。 GDI是汽油直接噴射系統的簡稱，利用電子控制噴射的方法，直接將汽油噴入引擎汽缸內，是一種燃油供應方式。缸內直噴引擎的優點是：改善動態反應，增加進氣效率，可以在很稀薄的混合比燃燒，降低油耗污染。 缸內直噴引擎，在壓縮行程結束前，直接對燃燒室噴射，能精準控制噴油量，混合比例提高了，而且不用擔心缸內自燃的問題，藉由提高壓縮比讓動力上升不少。 缸內直噴引擎省油的原因： ◆不需要使用節氣門來控制負載，因此就可以省去進氣時，所需付出的負功，而且體積效率也會比較高。 ◆可以避免燃料與空氣提早自燃，引擎的壓縮比提高，以提升熱效率，且可以使用辛烷值較低的汽油。 ◆使用分層燃燒模式時，火焰不會直接接觸汽缸壁與活塞，故可以有效降低熱損失；此外，在減速時，缸內直噴引擎還可以切換成斷油模式。 缸內直噴引擎不僅省油，還兼顧到車輛行駛狀況，與負載改變時所需之功率輸出，缸內直噴引擎運轉區域和燃燒程序之關係： • 在低負載條件，使用分層進氣燃燒，以降低油耗。 燃油在壓縮行程注入燃燒室
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