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As a part of our efforts to conform to particulate emission regulation in the U.S., a particulate trap system has been developed that collects particulates using a filter and burns them by heat of the exhaust gas. In order to more easily burn the particulates, the system combines a platinum catalyst to lower the ignition temperature of particulates and a mechanism which causes the exhaust gas to bypass the filter during non-injection periods, thereby preventing a temperature drop of the filter. In the various driving tests conducted, including urban areas, almost no particulate deposits were found on the filter. This simplified particulate trap system is outlined in this paper.

NO, OH, and soot in combustion flame produced from burning at high temperature and pressure diesel fuel spray issuing from a single-hole injection nozzle was measured by laser induced fluorescence (LIF) and laser induced incandescence (LII) methods. The LIF images of OH showed that OH radical, distributed in a band-like zone outside the region of the flame luminescence observed, would persist even after the extinction of flame luminescence. The LIF images of NO showed that NO was located slightly outside the flame luminescence zone and that its region was almost the same as that of OH and would tended to increase in the latter period of the combustion process. Also, the LII images showed that the formation of soot would take place near the flame central zone coincident with the flame luminescence zone.