AAA recently deemed clean diesel engines a top new vehicle technology, along with electric and plug-in hybrid cars, and various safety and engine technologies. "Modern diesel engines are clean, quiet, refined and powerful. They also are economical, often providing a 30% boost in fuel economy with a corresponding decline in carbon dioxide emissions compared to gasoline engines offering comparable performance," noted the car club's release.
So, on the heels of the AAA announcement, the Diesel Technology Forum issued a press release with some interesting data about diesels and hybrid cars. (The Diesel Technology Forum is a non-profit organization to "raise awareness about the importance of diesel engines." Forum members represent the three elements of" the modern clean-diesel system:" Advanced engines, vehicles and equipment, clean diesel fuel and emissions-control systems.")
Points made by forum Executive Director Allen Schaeffer in the release include:
New diesel automobiles are extremely fuel efficient, typically getting 20 to 40% more miles to the gallon than a comparable gasoline engine.
A Carnegie Mellon Tepper School of Business study highlighted that despite the slightly higher purchase price associated with diesels, they are a good value compared to gasoline-powered vehicles because of lower operating costs and higher resale value. [Ed. Note: My dealer keeps wanting to buy back by 2004 diesel wagon.]
While almost 50% of new autos sold in Europe are diesel-powered [Ed. Note: Due in large part to the tax structure], slightly more than 3.3% U.S. cars, lights trucks, and vans in operation are diesels, according to R.L. Polk and Company.
Sales of clean diesel cars increased by 37% in 2010, while hybrid sales fell about 6% in the same period. [Ed. Note: But the base number of vehicles is probably way larger for hybrids than diesels.] Month-over-month sales of all clean diesel cars were up 14% in December over November 2009, and 18.6% over December 2009. The new February 2011 diesel sales statistics reflect this continued increase in U.S. sales.
Currently, more than half of all service stations having diesel fuel available, up from only 42% just five years ago. [Ed. Note: Maybe in his neighborhood!] Coupled with the ability to also use bio and renewable diesel fuels, consumers are finding diesel power "an easier technology of choice."
OK, readers, why not comment with your take on all this diesel stuff?
I just don't understand why Americans don't like diesels when the rest of the world has already embraced them. When Americans think of diesel I'm sure more often than not they think of [url=http://www.stylintrucks.com]trucks[/url]. They are now very clean, not very noisy and not to mention diesel is cheap too. Carmakers should consider bringing their models stateside!
FWIW, alternative fuels are much better for air quality in either diesel or flex-fuel engines. When I switched to biodiesel, my opacity went from 8.0 to 0.9. That difference in air quality translates to better quality of life for those of us who breathe air.
Japan manufactures the largest number of hybrids and the recent tsunami and earthquake has severely reduced production. However, with a six week shipping delay, the impact only started to show up in April and will be fully realized in May. On Friday April 29, my Toyota dealer was out of Prius.
It is very likely that hybrid production and sales won't recover until the fall. In the meanwhile, it is likely we'll see much higher mark-ups as supply dries up.
Picking the right tool for the right job, one needs to evaluate their urban versus highway driving. Brake pads, diesels wear them out and hybrids don't. Wearing out brake pads is the inertial penalty that diesels pay in an urban environment. In contrast, towns and cities are where hybrids and electric vehicles excel. But even on the highway, at best, smaller parity with a Prius.
Recently we had 112 hours of power outage in North Alabama when tornadoes sliced up the TVA power transmission lines. But our 2003 Prius with a 1 kW inverter ran burning about 2 gallons per day to provide lights, TV, radio, and the gas furnace when temperatures dipped down. The hybrid provides continuous power from the traction battery and runs the engine only as needed to recharge the battery. Unlike a generator, the catalytic converter eliminates the carbon monoxide risk, the muffler makes inaudible beyond our property line, and the 11.5 gallon tank holds enough to gas to run four days with 'no shutdown' refueling.
Since 2005 when I added the inverter, we have averaged at least one use per year for periods ranging from a couple of hours to over four days. But more importantly, the hybrid is becoming the core of home, co-generation, something a constantly running diesel will have a hard time matching ... if ever.
Basically, most people in the US think of only fossil fuel. No matter how clean the diesel engines get, they will still be fossil fuel engines. More progress must be made in the battery and alternate energy to make it viable primary means, not a viable alternate source. If more heads starts to think of this, we will be more close to the solution rather than diluting the efforts in all directions.
My 2005 VW Golf diesel starts just fine at -20°F without a block heater. Winterized fuel, a good battery and a healthy engine is all it takes. Since the engine is so cold-blooded, I don't get heat for several miles. That is easily cured by partially blocking the radiator grill - something the new Ford Focus does to speed its warmup.
An engine design which combines aspects of diesels and Otto cycle engines is the HCCI. http://en.wikipedia.org/wiki/Homogeneous_charge_compression_ignition This engine runs on gasoline or similar lighter fuel. It starts and idles with spark ignition, but, once warmed up, crosses over to compression ignition. I know Ford, GM, Mercedes-Benz, Honda and VW are working on them. This will be challenging to get right.
Lots of articles on new engine, hybrid, electric car and battery developments at
How about a propane fired pre-start for a diesel engine in cold weather? This can also be fired up to keep the fuel warm too.
However, most folks use electric block heaters in very cold weather. Why not use this approach to also heat the fuel?
Hmmm, could the fuel be used to cool the engine so the heat energy be recycled into preheating the fuel? Food for thought...
Diesel's Achilles' heel is that the fuel can get way too viscous in the winter time if you live north of the Mason-Dixon line. Now if a diesel vehicle had a self-start mechanism that would periodically kick in to warm up the engine and fuel system via some sort of heat transfer mechanism then this weakness would go away.
If moderate or full hybrid lower emmisions are possible if engine kept running charging battery pack if not full. Warm up/shut down efficiency losses and emmision increases are minimised.
PS I am an EE but probably should have been an ME! Cool stuff
Two optimum solutions exist:
hybrid diesel light - Add just enough electric assist to get regen braking energy and off zero starting and re-starting the diesel at stop and go.
2nd) Atkins cycle can be applied to diesel as well with some engineering challenges, but do-able.
Highest MPG and lowest emmisions AND CHEAPEST if done this way
Join our online Radio Show on Friday 11th July starting at 2:00pm Eastern, when EETimes editor of all things fun and interesting, Max Maxfield, and embedded systems expert, Jack Ganssle, will debate as to just what is, and is not, and embedded system.