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Abstract
- Thanks to a new exhaust-gas sulfur-trap scheme, Toyota's "diesel particulate NOx reduction" (DPNR) system for light-duty diesel vehicles is starting to show potential for possible U.S. EPA Tier-2, Bin-5 certification, if Toyota ever decides that diesel cars are worth marketing in North America.
In the U.S., a slightly higher 15-ppm sulfur ULSD is also widely available. Nevertheless, 500-ppm sulfur diesel is still widely available for some older highway vehicles as well as virtually all non-road diesel vehicles in the U.S., Akira pointed out.
So, while the DPNR system theoretically might be "possible" for the Bin-5 U.S. market with <15-ppm ULSD, the wide availability of higher-sulfur diesel remaining in the U.S. could block introduction because of misfueling concerns, Akira told us.