還在研發中的新發動機技術,25%提高mpg:Hyundai Developing Gasoline-Burning Compre

來源: soccer88 2016-08-24 11:46:02 [] [博客] [舊帖] [給我悄悄話] 本文已被閱讀: 次 (3991 bytes)

Hyundai Developing Gasoline-Burning Compression-Ignition Engine

 
November 18, 2013 at 2:37 pm by | Photography by Mike Parris

Despite our unabashed love for the prodigious torque and impressive fuel economy of diesel engines, the fuel itself does actually have a few drawbacks. It’s often more expensive than gasoline; while it contains 15 percent more potential energy than gasoline, it’s also 15 percent dirtier; and burning it usually requires the use of costly components, such as high-pressure fuel pumps, particulate filters, and urea-injection systems. To get around those drawbacks, Hyundai is developing a gasoline-burning compression-ignition engine in conjunction with Delphi and the University of Wisconsin.

 

Hyundai says that its under-development mill, which it calls GDCI (Gasoline Direct Compression Ignition), will achieve a 25 percent improvement in mileage compared to its current crop of spark-ignition gas engines. Unlike some other automakers’ previous attempts at gasoline-burning compression ignition, Hyundai will not fit the engine with any spark- or glow plugs. Instead, ignition will be achieved only after pre-heated air has been compressed and fuel is injected after top dead center, resulting in an efficiency-maximized power stroke. This is different than homogeneous-charge compression-ignition (HCCI) engines, which inject fuel earlier in the intake stroke and compress the well-mixed fuel and air charge until it achieves autoignition. (Read more about HCCI here, here, and here.) In Hyundai’s GDCI engine, as much as 40 percent of the intake air will actually be recirculated exhaust because the inert gas reduces nitrous-oxide emissions. Hyundai also says that an intake heater would likely be fitted for extreme cold starts.

The Korean automaker says that cost will be kept down in comparison to a diesel motor because its engine will use conventional solenoid injectors rather than the costly piezo units commonly found in today’s diesel engines. And Hyundai says that it can navigate around the cost of diesel engines’ high-pressure fuel pumps by running fuel pressures of less than 500 bar compared to a diesel unit’s 1800–2000-bar operating range.

The project hasn’t been tested outside of a controlled environment and on an dynamometer, but Hyundai said that preliminary results have been “very, very promising.” At this stage, we remain some time away from seeing a production-spec product—if it happens at all—but Hyundai is confident that it will be selling cars powered by gasoline-burning compression-ignition engines within the next 10 years.

所有跟帖: 

好像尼桑也在搞這玩意兒。 -bluesmich- 給 bluesmich 發送悄悄話 (0 bytes) () 08/24/2016 postreply 13:11:34

直接談談有啥好外! -Tiger666- 給 Tiger666 發送悄悄話 (0 bytes) () 08/24/2016 postreply 13:33:43

哦哦,試著總結一下 -soccer88- 給 soccer88 發送悄悄話 soccer88 的博客首頁 (146 bytes) () 08/24/2016 postreply 13:38:34

很想知道怎麽樣讓高壓油泵密封. 柴油可以形成自身油封, 汽油可能不行. 而且汽油沒有潤滑作用, 油泵的壽命也是問題. -花椒- 給 花椒 發送悄悄話 (0 bytes) () 08/24/2016 postreply 13:42:57

好問題 -soccer88- 給 soccer88 發送悄悄話 soccer88 的博客首頁 (654 bytes) () 08/24/2016 postreply 13:57:35

老兄是學機械的嗎? -soccer88- 給 soccer88 發送悄悄話 soccer88 的博客首頁 (0 bytes) () 08/24/2016 postreply 14:22:16

不是。 隻是喜歡動手。 -花椒- 給 花椒 發送悄悄話 (0 bytes) () 08/24/2016 postreply 17:07:59

以前在船廠時知道柴油機高壓噴嘴開關要快關時不能有油滴。否則積碳。沒有橡膠密封都是鋼黃銅結構,都研磨過。 -老子說兩句- 給 老子說兩句 發送悄悄話 (0 bytes) () 08/24/2016 postreply 15:50:19

壓縮比得有多大空氣得多熱汽油才能自然? -MoonRiverMe- 給 MoonRiverMe 發送悄悄話 (59 bytes) () 08/24/2016 postreply 15:24:42

runs a 14.8:1 compression ratio -soccer88- 給 soccer88 發送悄悄話 soccer88 的博客首頁 (188 bytes) () 08/24/2016 postreply 16:11:10

這得要巨大的EGR回路? -68245- 給 68245 發送悄悄話 (169 bytes) () 08/24/2016 postreply 15:54:59

as much as 40 percent of the intake air will actually be recircu -soccer88- 給 soccer88 發送悄悄話 soccer88 的博客首頁 (0 bytes) () 08/24/2016 postreply 16:05:20

Ultra Efficient Light Duty Powertrain -soccer88- 給 soccer88 發送悄悄話 soccer88 的博客首頁 (170 bytes) () 08/24/2016 postreply 16:20:02

最關鍵的沒說:Emission。類似的很早就有了但是尾氣沒法過關 -yyang3- 給 yyang3 發送悄悄話 (0 bytes) () 08/24/2016 postreply 17:55:32

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