vvt可變氣門正時技術(shù)-資料下載頁
2024-11-17 15:47本頁面
【導(dǎo)讀】日本車省油的問題，有人一口咬定是因為日本車輕??他們也無法解釋同樣是噸的卡羅拉和捷達，前者比后者省油的問題；他們更無法解釋的QQ3比的F0費油的原因。其實這個問題提法就不大對，而是因為問什么樣的車省油。下面就由我來好好解釋。并能大大改善燃油經(jīng)濟性，有效提高汽車。的功率與性能該技術(shù)又減少油耗和廢氣排放。目前該技術(shù)又分為i-VTEC和VVT-i. 的進、排氣時機，并且進一步提高了發(fā)動機的功率。扭矩，VVT-i系統(tǒng)按控制器的安裝部位不同又可以分成多種。在節(jié)能經(jīng)濟領(lǐng)域，VVT遠(yuǎn)遠(yuǎn)比渦輪實用。不僅油耗表現(xiàn)更出色，保養(yǎng)也便宜。氣中的汽油含量低，汽油與空氣之比可達1：25以上。式推動，使混合氣體集中在位于燃燒室中央的火花塞周圍。發(fā)動機在車輛總重中所占的比例是不能忽略的，重量減輕的。據(jù)發(fā)動機負(fù)荷工況，停止部分氣門工作。正因如此，高轉(zhuǎn)速區(qū)域和低中轉(zhuǎn)速域所需求的氣門正時和升程?；谠摷夹g(shù)，Honda開發(fā)出了3款發(fā)動機。第一款是DOHCVTEC發(fā)動機，以高馬
【正文】 er using a hydraulically actuated shaft. The central pin is actuated by a smallprofile lobe on the camshaft, while the outer sleeve remains in continuous contact with two larger profiles on either side. Since there are effectively two cam contours on each intake camshaft, it is possible to apply two different valvelift curves. The phase angle, or timing, on each of the cams can be advanced or retarded using an electrohydraulically actuated adjuster. Small cam. Low lift. Optimum bustion VarioCam Plus offers a number of benefits when starting the engine from cold. Combustion is improved during the warmup process, thereby reducing emissions. The system also provides smoother idling while enhancing fuel economy. Under low throttle load:, VarioCam Plus uses a long positive overlap ., increases the period during which both valves are open simultaneously ?as a means of maximising fuel efficiency. Since a relatively high proportion of exhaust gas is present during bustion, there is also a significant reduction in NOx emissions. Fullthrottle mode: Large cam. High lift. Optimum performance, the valve gear is adjusted for optimum power and torque. The valve lift is switched to the high cam setting, enabling maximum torque output of 560 Nm on the 911 Turbo from as low as 2,700 rpm. The curve remains flat all the way to 4,600 rpm, covering a significant portion of the engine speed range. variocam plus 應(yīng)用實例 注意看凸輪軸上的凸輪數(shù)目 911 特飽 忘了型號的蛤蟆 gt2 沒有用 variocam plus 的破鞋機器 卡雷拉 GT 2020 boxter 米醋的 mivec 通過搖臂上一個滑塊的移動來控制不同的氣門升程 宏大在油電車上的 vtec 通過氣門搖臂內(nèi)的頂針的移動，能實現(xiàn)氣門關(guān)閉發(fā)動機空轉(zhuǎn)。 改進型的設(shè)計還能實現(xiàn)進氣門兩段升程調(diào)節(jié)。 這段錄像說明了切換過程。 宏大傳統(tǒng)的 DOHC Vtec 結(jié)構(gòu) 油電車還應(yīng)用了雙火花塞 宏大的引擎技術(shù)真是復(fù)雜。 偷油 (TOYOTA)的最新的 valvematic 技術(shù)。可變氣門正時和升程調(diào)節(jié)技術(shù)。 專利文檔比較長 ,看不下去。 nology/
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