Homogeneous Charge Compression Ignition

[CamaroSpike23]

Originally Posted by 2ndgenz28

If you read up on those crazy high mile cars from the past and was still a carb or early FI. They super heated the fuel to basically do like a refinery and crack the fuel molecules. The high heat and compression of like a diesel could do that right???
theoretically, yes.
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Now with the new cruise matching the VW diesel MPG on the highway [42MPG for both cars] you have to wonder if that’s the end of diesel in passenger cars. No real point if they don’t get allot better mileage with the fuel costing $1.50+ more per gallon.

dont see it being the end of diesel, just waiting to see diesel fuel economy to continue to rise. looking at the few diesel cars (not trucks) on the road today (not in sheer numbers, but the number of different diesel models in general), there hasn't been a huge growth in America just yet. over in Europe, thats another story.

Originally Posted by Dragoneye

HCCI + BAS...mmmmmmmm
You likey? me thinky...

I recall an article reporting on the real possibility of bringing a diesel Cruze to the states. I think it was something like 45+ hwy...

theres been articles reporting on the real possibility of just about every car on the road converting to diesel.

4.5L Duramax Camaro anyone?

[8cd03gro]

Originally Posted by CamaroSpike23

considering that it would be working with direct injection (like that of the V6 camaro), preignition wouldnt be that big of an issue as you wouldnt be injecting the fuel until right up until the point of ignition anyway. that added in with the exhaust gas that stays in the cylinder with this design would minimize the chance of preignition. to an extent, its the same way the V6 currently operates only without a spark plug to ignite the combustion mixture.


HCCI technology is old so to speak, but you dont see it in operation today (outside of diesels).


to further the discussion on "future" technologies... how bout GM's BAS system?
http://www.hybridcars.com/types-syst...-starters.html

another "old" technology, that is just barely starting to make its way into the mainstream automotive design.

How can you inject just before TDC on the compression stroke if you're creating ignition through compression?

[Mr. Wyndham]

Originally Posted by 8cd03gro

How can you inject just before TDC on the compression stroke if you're creating ignition through compression?

That's the computer timing. They'll know exactly how much pressure is required to ignite the fuel about to be injected, and shoot it in just before that point.

I suppose it could also reduce the chances of pre-ignition, since there won't be any fuel...

[DGthe3]

Originally Posted by 8cd03gro

How can you inject just before TDC on the compression stroke if you're creating ignition through compression?

Compressed air is hot. Introduce fuel into that hot air and it ignites.

[CamaroSpike23]

Originally Posted by 8cd03gro

How can you inject just before TDC on the compression stroke if you're creating ignition through compression?

see below

Originally Posted by DGthe3

Compressed air is hot. Introduce fuel into that hot air and it ignites.

this.


the overall basic operating principle is nearly identical to a modern diesel engine. both are compression ignition engines, both compress air, then inject fuel into the superheated/compressed air inside the cylinder and it auto-ignites. a key part of this setup is the use of capturing exhaust gases in the cylinder to help heat the incoming air charge. one of the other benefits of this type of system is the capability to run higher comp ratios. (like 15:1), which adds to the potential power output of the engine as well as helps burn the entire fuel/air mixture. and since there is no spark plug (or glow plug) to originate the ignition point (either by the spark or the heated plug) the fuel/air mix will ignite at more than one location nearly simultaneously allowing for a more complete burn of the mixture.