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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.