The Asahi Shimbun reports that Toyota has developed a next-generation clean diesel engine to meet stricter emissions standards in the US, and in Japan and the European Union in coming years.
Toyota reportedly hopes that its new engine—developed on its own, and not part of its new work with Isuzu—will help it expand its diesel sales. While seen as a leader in hybrids, Toyota does not have the same position with diesel technology. Honda has targeted introduction of its own clean-diesel solution for the US in 2009. (Earlier post.)
The unnamed sources cited in the report said that Toyota increased the combustion efficiency of the engine through improvements in injection nozzles to reduce engine out emissions, and then also improved a catalytic converter that reduces both particulates and NOx.
The report notes that Toyota is targeting worldwide introduction of its new clean-diesel technology diesel more quickly than that of BMW, which just announced its intention to introduce diesels in the US in 2008. (Earlier post.)
In 2005, diesel engine models accounted for 40% of Toyota’s parent-only unit sales in Europe. With the new engine, the company aims to increase the ratio to more than 50% by 2010. An earlier report by the Nihon Keizai Shimbun suggested that Toyota will use engines co-developed with Isuzu in the European models. The report also said that Toyota separately is developing a new generation of high-performance diesel engines. (Earlier post.)
The US EPA 2007 standards—which begin to map to the California vehicle standards at Tier 2 Bin 5—are currently the most stringent. Japan and the European Union are considering introducing comparably strict standards in 2009 and 2010, respectively.
Under the three standards, the cap for PM emissions will likely be comparable: about 0.005 grams per kilometer of driving for passenger cars. The US standards will be particularly stringent on oxides of nitrogen, while the European rules will call for lower emissions of carbon monoxide than the others.