SOME FINAL WORDS ON TIER 4 FINAL

摘要

Engine manufacturers outline technology paths intended to surmount last - for now - significant emissions hurdle. What is (fill in the blank) going to do for Tier 4 final?" While we may have written extensively about it in Diesel Progress for the last five years, tweeted about it, given speeches about it, participated in panel discussions about it, no subject continues to draw interest quite like the implementation of Tier 4 final engine emissions standards. With three different horsepower bands facing final standards over the next three years, people just can't seem to get enough information. They're always looking for that last nugget of data that will presumably make them feel more comfortable about what will be powering their machines for years to come. Because of the segmentation of the power bands and the different implementation dates for each, the flow of information has been anything but steady and consistent. At this writing, some engine manufacturers are continuing to shape their messages about their Tier 4 final strategies. John Deere, for instance, has not disclosed specifics on how they will meet the standards publicly, but in a statement told Diesel Progress that "we can say that technologies such as cooled EGR, variable geometry turbochargers and exhaust filters will likely be the foundation technologies for meeting final Tier 4 regulations."