LPG on gasoline direct injection engines
LPG on gasoline direct injection engines
(OP)
Direct injection is spreading quickly as environmental legislation is more severe. What future to bi-fuel(LPG and gasoline) cars? Would it be possible to use the same injector to one or another fuel(both on liquid fase, of course)? Any ideas? Thanks!





RE: LPG on gasoline direct injection engines
With regard to injecting liquid LPG through a GDI injector I suspect that the lack of lubricity would be one big problem followed by ice formation. No fundamental reason why it couldn't be made to work, but I suspect a different injector would be required making Bi-Fuel tricky.
RE: LPG on gasoline direct injection engines
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RE: LPG on gasoline direct injection engines
The idea is being looked at.
http://www.me.utexas.edu/~sae/37chevy.html
RE: LPG on gasoline direct injection engines
RE: LPG on gasoline direct injection engines
Franz
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RE: LPG on gasoline direct injection engines
RE: LPG on gasoline direct injection engines
Maybe the minimum amount to be effective already causes smoke problems?
I have access to some technologies with plastic bearings that can far outperform metals under some circumstances with no external lubrication.
Regards
pat pprimmer@acay.com.au
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RE: LPG on gasoline direct injection engines
Regarding gasoline GDI the problem is that the control is quite tricky and achieving the theoretical benefits in practise has proved to be difficult. There is a lot of development work at the moment though including running in HCCI mode for part of the load range.
RE: LPG on gasoline direct injection engines
RE: LPG on gasoline direct injection engines
Another research reported about the poor fuel consumption and tailpipe emission.
RE: LPG on gasoline direct injection engines
High Pressure CNG has an advantage over LPG since it is not compressible into a liquid. Injecting liquid propane directly into a cylinder will quickly cool the interior of the combustion area and may result in combustion pockets, high HC, and poor drivability. Azimo's reports are correct.
DI has its place and can provide very good performance, and this process is a "hot topic" in many research facilities.
Franz
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Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: LPG on gasoline direct injection engines
The two-phase nature of LPG makes it problematic for handling as a liquid. This issue may well be exacerbated in the high temperature environment of a direct injector.
It would be remarkable indeed for an injector design that was optimized for gasoline to be at all suited to liquid LPG.
Direct CNG injection (gaseous phase, of course) is showing some promise. Check out www.westport.com
RE: LPG on gasoline direct injection engines
I wasn’t able to find any information on your link, hemi. Please take a look at it, thank you again
RE: LPG on gasoline direct injection engines
http://www.westport.com/expertise/injectors.php
RE: LPG on gasoline direct injection engines
I'm not familiar with auto engine technology that well, how much stratification can you achive?
We have slow speed natural gas engines as drivers for our natural gas pipeline. These turn at about 300 rpm and have very poor mixing characteristics. I have seen some discussion about duel fuel for these units. When you lean burn these engines it is diffucult to get them to ignite. People use pre-combustion chamber igniters, but the rich mixture in the pre-combustion chamber causes enough Nox, that it is a significant portion of your total Nox output. The idea was to use a liquid fuel in the precombustion chamber to light the lean natural gas mixture in the main chamber. The liquid burned was very small and was in this situation much cleaner than the vapor fuel alone. The natural gas fuel was introduced in the air manifold for this application.
RE: LPG on gasoline direct injection engines