T*U
发帖数: 22634 | 1 http://www.msn.com/en-us/autos/news/mazdas-next-gen-skyactiv-engines-will-drop-spark-plugs-in-favor-of-high-compression/ar-AAlV9gi?li=BBisPVf&ocid=spartanntp
Homogeneous charge compression ignition, or HCCI, is the black art of of
internal combustion engines that aims to produce diesel-like fuel efficiency
for the cost of gasoline. Although some of its competitors have developed
and subsequently given up on the tech, Mazda confirmed that the next-
generation of SkyActiv engines will employ HCCI technology, improving fuel
economy by 30 percent and at the same time reducing exhaust emissions.
According to Nikkei, a new SkyActiv family of engines is set to debut under
the hood of the next-gen Mazda3 sometime in 2018 before making its way into
other vehicles. In simple terms, an engine that uses HCCI burns the air/fuel
mix using pressure instead of with spark plugs, just like a diesel. At 14:1
, Mazda's gasoline engines already have some of the highest compression
ratios out there, but a move to HCCI means cranking up the compression to 18
:1.
While the tech sounds relatively straightforward, using HCCI means dealing
with a number of side issues. It's one of those "on paper" ideas that
compounds problems when put into practice. Heat, revs, and fuel must all be
carefully managed as gasoline doesn't burn the same way as diesel. Mazda is
mum on details, but the automaker seems confident that the issues have been
sorted. If the new engines do indeed make it to market with HCCI, Mazda will
have out-engineered GM, Daimler, and Hyundai, all of which have tried and
failed to develop HCCI engines in a cost-effective package.
With the market moving towards electrification, it's interesting to see
Mazda still focusing so heavily on traditional internal combustion gasoline
engines. It's an indication of where they see the market heading for the
next few years. Although the automaker has been hesitant to move forward
with hybrid and electric powertrains, Nikkei also reports that Mazda will
begin mass production of EVs in 2019. | l*****6
发帖数: 7881 | 2 这个靠谱吗？真成功的话还是很牛逼的。
efficiency
under
into
fuel
【在 T*U 的大作中提到】
: http://www.msn.com/en-us/autos/news/mazdas-next-gen-skyactiv-engines-will-drop-spark-plugs-in-favor-of-high-compression/ar-AAlV9gi?li=BBisPVf&ocid=spartanntp
: Homogeneous charge compression ignition, or HCCI, is the black art of of
: internal combustion engines that aims to produce diesel-like fuel efficiency
: for the cost of gasoline. Although some of its competitors have developed
: and subsequently given up on the tech, Mazda confirmed that the next-
: generation of SkyActiv engines will employ HCCI technology, improving fuel
: economy by 30 percent and at the same time reducing exhaust emissions.
: According to Nikkei, a new SkyActiv family of engines is set to debut under
: the hood of the next-gen Mazda3 sometime in 2018 before making its way into
: other vehicles. In simple terms, an engine that uses HCCI burns the air/fuel
| p*********r
发帖数: 4593 | 3 像柴油机一样，用铁铸的 engine.
如果真搞出来，那 engine 几乎是 maintenance free. |
|
