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為何隔夜發動汽車,轉數會較高一陣子?
Oct 27th 2014, 15:05


ozaki0633 wrote:
就噴射引擎而言如果隔...(恕刪)

跟冷卻水的溫度有關。

怠速馬達有一個通道是接水管進出的,

當經過一夜冷卻的冷卻水水溫非常低,

怠速馬達偵測到如此低溫的冷卻水溫後,

會把訊息傳給內部電腦進而把節氣閥給打開,讓燃燒室進氣後燃油,

以提高轉速約1200轉讓引擎達到工作溫度,附加讓油溫也達到工作溫度。

引擎熱起來時把熱量傳給冷卻水以散熱,

冷卻水的水溫就慢慢升高了,

此時你看儀表板上的水溫表,會慢慢升高。

水溫升高的同時,節氣閥的開度也慢慢減少,

直到水溫達到標準溫度後(大約水溫表中間位置),

節氣閥完全關閉,此時車體會更安靜,轉速也降到800轉了。

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