Rest In Peace, old friend, your work is finished..... 
If you want ON or OFF the DIESEL ”KnOcK” LIST jut FReepmail me..... This is a fairly HIGH VOLUME ping list on some days.....
Posted on 09/12/2013 8:20:16 AM PDT by Red Badger
Rest In Peace, old friend, your work is finished.....
If you want ON or OFF the DIESEL ”KnOcK” LIST jut FReepmail me..... This is a fairly HIGH VOLUME ping list on some days.....
This doesn’t sound practical to me.
(1) Carbon build up will eventually cause pre-det issues with the natural gas being sucked in through the intake stroke, as the engine ages.
(2) Have to put two fuels in your car, granted it won’t be a lot of diesel all told, still annoying.
More practical would be if they had figured out a reliable injector pump design that could inject CNG into the cylinders at the required pressures for diesel ignition of natural gas. That is probably a very tough problem though... mechanically speaking. Also, increasing engine robustness while reducing weight, to handle the higher compression ratios required (ethanol takes 23:1, I’d expect natural gas to be somewhere between ethanol and diesel... have not looked this up).
A sensor that measures pressure in the cylinders plays a key part...
...aaaand there's one of the major technical hurdles, at least as I'm aware of. I haven't looked into it in a while. That pressure sensor is going to see on the order of 100 million pressure cycles over the life of the engine. That's a lot.
2.41 what per 100 km?
2.4 LITERS, That’s an ‘L’ not a ‘1”.........
And in the years prior to invention of petroleum fueled engines....machinery (pumps and lifts for coal mines) were fueled by pulverized coal.
It doesn’t look to me like they’ve solved an important issue in natural gas-diesel engines. Surprisingly, it’s soot. Liquid fuel disperses quite evenly in a diesel combustion chamber. Gas doesn’t disperse evenly. This leaves pockets of gas rich zones which have insufficient oxygen, and create soot. You know, the black stuff you see coming from diesel trucks when they accelerate. It seems like some in the “Green” community don’t like this.
http://www.angellabsllc.com
http://ecomotors.com
We have "dual fuel" trucks in the US, that run on natural gas or diesel. While there's natural gas, it runs with gas plus a little diesel. When the natural gas tank is empty, it runs on pure diesel. This is a more practical arrangement until the natural gas infrastructure is built up better.
To calculate the CO2 emission from a fuel the carbon content of the fuel must be multiplied with the ratio of molecular weight CO2 (44) to the molecular weight Carbon 12 -> 44 / 12 = 3.7
Carbon Dioxide emission can be calculated as
qCO2 = cf / hf CCO2/Cm (1)
where
qCO2 = specific CO2 emission (CO2/kWh)
cf = specific carbon content in the fuel (kgC/kgfuel)
hf = specific energy content (kWh/kgfuel)
Cm = specific mass Carbon (kg/mol Carbon)
CCO2 = specific mass Carbon Dioxide (kg/mol CO2)
Angel Labs has a very old engine concept. Probably doomed to wankel status.
Not sure about the other design from EcoMotors. Looks very interesting. Submarine and some locomotive motors used that opposed piston tech, just not the opposed cylinder part.
The motors that were so reliable in subs, were never really popular in locomotives, they tended not to hold up in over the road use.
http://www.angellabsllc.com/resourse.html
Best is to download the excel demo and watch it.
“...aaaand there’s one of the major technical hurdles, at least as I’m aware of. I haven’t looked into it in a while. That pressure sensor is going to see on the order of 100 million pressure cycles over the life of the engine. That’s a lot.”
Piezo might be able to do it.
Thanks.
No disrespect: but lookup Otto Lutz and the swing piston engine. Old news, terrible design, all the Wankel sealing issues. The Wankel is dead for a reason, and the swing piston engine has not seen a commercial application yet.
And in a world where CO2 emissions don't matter because AGW is no longer an issue, we need to concentrate on the highest possible efficiency, regardless of the CO2 levels.
Lowering CO and NOX I can understand...
That’s what we use - Kistler. They’re pricey and finicky. Not sure how well they last in continuous use. Not saying 100e6 + cycles isn’t possible. I just think it’s dicey for a low cost automotive part.
Not even close, the swing-piton engine is a reciprocating engine, the Angellabs engine is not. Download the excel file and watch it.
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