
By: Rob Parker
If automotive fuel trends paralleled the fashion industry, diesel would have a reputation for being something akin to polyester: old fashioned, uncomfortable, and kind of smelly. The reality is that, despite the unappealing odor, diesel fills our air with fewer toxic chemicals than petrol, and diesel engines go farther on a single tank of fuel, at times rivaling - and even exceeding - hybrid fuel economy numbers.
Despite this, we still tend to think of diesel in terms of what we might get stuck behind in traffic: large trucks, and buses with rooftop exhaust pipes. Avoidance of diesel, however, is something we ought to rethink, especially for those of us who live in places where hard freezes are rare (diesel can thicken when the temperatures are too cold). Two major car makers, Audi and Toyota, are helping us to do this, by building diesel fueled automobiles for the general market, which are rolling off the assembly lines right now.
Audi was the first to tout their new diesel offerings. They've formed a division in charge of their explorations into clean diesel, which they refer to as TDI, and have it set up to find technology that will meet vehicle emissions regulations in all 50 U.S. states.
The acronym "TDI" actually stands for "turbocharged direct injection" and it refers to a collection of systems and technologies that target particulate and NoX output, and also makes sure that Audi's diesel fueled vehicles meet California's emissions controls that are among the toughest in the world today. "TDI" also refers to the actual power-trains and diesel engines that Audi builds.
The first diesel Audi offers will be the Q7 TDI V-6 SUV, and it's designed to meet emissions standards from 2009 onward.
Audi will be including the TDI designation on their nameplates to help car buyers tell which vehicles have clean diesel technology, and all the benefits thereof, including faster acceleration and lower fuel consumption over all.
Meanwhile, Toyota has been involved in a series of negotiations with Japanese diesel expert Isuzu, over the possibility of shared technology, and will also be offering diesel powered cars by 2012 if not sooner.
Initial reports of the Toyota Isuzu collaboration surfaced in July, with announcements made in August that plans were going forward. Among the reports made was the news that Isuzu has invested in a plant in Hokkaido, Japan, so that they can supply 200,000 low-emission diesel engines a year to Toyota.
This collaboration cannot really be a surprising, since Toyota bought a 5.9 percent stake in Isuzu in November of 2006. Since then, the two companies have talked about sharing resources for field research, development of small diesel engines, and other alternative fuel technology.
Toyota has long demonstrated their commitment to green fuel. While they were not the first major manufacturer to offer hybrid technology (that distinction goes to rival Honda), their Prius remains the standard for the concept.
With major makers moving diesel into the general market, it would not be surprising if, in a few years, instead of complaining when they are stuck behind a bus, drivers comment that they are trapped behind a car still using that old-style fuel.
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