Particulate Filters for Gasoline Direct Injection Engines?

2003silverado wrote:

I, and I think others on this forum have sacrificed the power of the diesels for the simplicity and lower cost of repair of the gas engines. Not trying to start a fight because I know a lot of people with the newer diesels like them better than the trucks of a decade ago, but I don't know anyone that wouldn't rather have the engines today without the emission systems.

I'm in that group.

Looks like they are going to make the gas engines too complicated for their own good along with the diesels. Up until 2007 diesels used to be considered the pillars of reliability due to their relative simplicity, mainly due to the lack of an ignition system. Since 2007 diesels have been made more complicated in the name of reduced emissions, and it seems most of the problems with the diesels is due to the emissions systems, or the injection systems that are also designed to reduce emissions.

I, and I think others on this forum have sacrificed the power of the diesels for the simplicity and lower cost of repair of the gas engines. Not trying to start a fight because I know a lot of people with the newer diesels like them better than the trucks of a decade ago, but I don't know anyone that wouldn't rather have the engines today without the emission systems.

jus2shy wrote:
One of the proposed approaches of handling particulate matter from a GDI motor: SAE Article on GDI.

Some interesting notes.

• Looks like Audi will join the ranks of Toyota in implementing a port and direct injection setup to help aid in reducing soot emissions (probably with the added side effect of washing the backs of the intake valves as well).
  
• Particulate filters are also noted as a possible way to curb soot emissions.
  
• Also seems like they're looking to higher injection pressures and increasing fuel atomization, getting the injection scheme closer to that of diesels. I have to wonder how that will work with a fuel that has even less lubricating properties than Diesel. Hopefully they don't use the CP4 as a springboard for designing a new injection system ;)

The 2017-2022 time period will be interesting in the world of the Internal Combustion Engine (gasoline specifically).

Do some research on the direct injected 2 stroke outboard motors if you want some examples of how gasoline can be injected at higher pressures.

GDICI is also in the works and beyond the proof of concept stages

Another potential is vaporizing the gasoline just before DI, but the pressures
involved 'almost' phase changes it back into a liquid...that is where tons of
patents *WILL* be

My bet is in pre-chambers. Either or for both liquid gasoline and vaporized gas

Current prototypes of GDICI has exhaust particulates and NOx in the same realm
of diesel

Currently, the Fed's have grants for sewage treatment plants in the Continental USA
for flare off gases to be converted into LNG for automotive use. I'm not a fan
of that, yet. My work in solid state compressors beats all of the piston compressors
both in efficiency and longevity. My city's PW's has an approx $2.5M grant just
for that, but am skeptical of how many gallons per day, vs the city fleet and
the ROI of such a venture

When was still considering moving to diesel...research found that the next gen
(now the current gen) would have very, very onerous smog controls. Within that,
the discussion of after burners, etc does do the trick on particulates, but the
gases formed were not easily controlled...back to particulate filters, etc

The CP4 has nothing nifty anymore and it's 'main' weakness if that the piston
rod is NOT captured on the cam (crank), nor piston bottom. Another, but not the
only other, weakness is that they used the diesel as the cam/follower/etc lube & coolant

So another piston like pump with a captured piston to rod to crank would be less
likely to have similar issues. A caged desmodromic setup would be way better

Going back to a supplemental port injector kinda sorta defeats one of the key
benefits of GDI and that is no fuel in the manifold...therefore higher
advance without detonation.

All of he papers read up till now, says GDICI works and am hopeful they will
do some work on larger displacement ICE's

Too many look to reduce displacement as the main means of increasing MPG with
a highly stressed, small displacement ICE. I like larger displacement
variable displacement and think the patents have been keeping others
away to stay with the small displacement, but highly stressed

There is yet, another particulate filter, but can't say anything more on that
till they announce. That will work for both gasser and diesel. Of course after
they file and have OEMs lined up for proto's