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Diesel particulates (aka: soot) comes from unburned fuel during the combustion process due to insufficient heat in the combustion chamber. This can be reduced w
by zelon88 8y ago
Diesel particulates (aka: soot) comes from unburned fuel during the combustion process due to insufficient heat in the combustion chamber. This can be reduced with software that eases into the throttle instead of literally translating the input from the gas pedal into throttle input. Applying the throttle slower results in more complete fuel burn. Here in the USA when you crank up your injectors to create the black cloud of smoke it's called "rolling coal." It's how you get more power out of a diesel engine without changing anything else. Just pour in more fuel. Because they don't have butterfly valves in the intake or throttle plates, diesel engines usually operate at or in excess of 100% volumetric efficiency. So while a 2.0L gas engine will consume 900cc of air at partial throttle, a diesel engine WILL ALMOST ALWAYS consume approximately it's displacement worth of air on an intake stroke. So a 2.0L diesel, even at part throttle, is consuming around 2.0L (or more) of air per intake stroke.
So to limit particulates, add a throttle limiter that limits throttle changes to a certain speed where the temperature of combustion increases proportionate to the fuel being injected.
You can also reduce soot output by filtering the fuel. You can refine diesel until you're blue in the face, but the fact of the matter is you get to a point where the cost of refining it isn't worth the benefit coming out of the tail pipe.
Not to mention the soot falls back to Earth and doesn't stay in the atmosphere as long as you think it does. So much of that black cloud is getting washed into your sewers when it rains.
You've found a bug in your code and you want to throw it all out and start over?
- jeffwass 8y agoThis doesn’t even touch on NOx emissions, which are way worse (at least for me). Though you appear to have some vested interest in the proliferation of Diesel engines.
- zelon88 8y agoMy vested interest comes as a result of enjoying vehicles. I am as much a gearhead as I am a hacker, and seeing something so efficient, so powerful, and so useful that LITERALLY built the industrialized world by powering 18 wheeled trucks and trains and container ships get crapped on by people who don't even know what the difference between their Corolla and a diesel engine actually are. I owned a 1990 CTD Dodge W350 truck and that thing would do a brakestand from a 3rd gear clutch drop AT IDLE... with 300k miles on the clock. Find me a V8 gasser that can do that and pull a trailer through the Kangamangus at 20+mpg.
- tdr 8y ago1) if it’s so simple, why isn’t it done yet? And no trade-offs? 2) references please (for you arguments)
- zelon88 8y agoThe trade off is drive-ability and throttle feel. The vehicle will feel sluggish, but it won't "roll coal" if you ease into the throttle. This can be proven by gasp actually driving a diesel powered vehicle and a) stomping on the gas pedal and b) easing into the gas pedal. The more common solution it diesel particulate filters in-line of the exhaust pipe that cause the soot to completely burn off. This is a trade-off because the DPF requires maintenance. Some systems even go so far as to implement aggressive exhaust gas recycling, pumping already burned exhaust back into the intake to be burned again. And for references... 1. Why do diesels produce black smoke..... https://commercial.lubrizoladditives360.com/black-smoke-cause-impact-and-prevention/ https://commercial.lubrizoladditives360.com/black-smoke-caus... 2. What is diesel exhaust..... https://en.wikipedia.org/wiki/Diesel_exhaust https://en.wikipedia.org/wiki/Diesel_exhaust 3. Diesel misconceptions..... https://phys.org/news/2011-06-myths-diesel.html https://phys.org/news/2011-06-myths-diesel.html
- jeffwass 8y agoThese are carefully cherry picked. Your diesel misconceptions link only addresses soot particulates but not NOX or other toxins.