Nixon & Vanderhye P.C.
Exhaust gas cleaning device for internal combustion engine
The recycling timing schedule for a diesel particulate filter (DPF) can be easily and accurately determined. There is a differential pressure sensor that detects differential pressure &Dgr;P in the DPF, and an airflow meter that detects the flow velocity v in an exhaust path. An ECU calculates the quantity of deposited fine exhaust particles ML according to:ML=[&Dgr;P&#8722;(A&mgr;v+C&rgr;v2)]/(B&mgr;v+D&rgr;v2)Recycling of the filter is determined according to a determination formula used to compare the calculated deposited quantity ML to a reference quantity. In this way, the deposited quantity can be accurately obtained without using a map.
Denso Corporation
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Makoto Tsukasa Shinichiro Shigeto
Saito Kuboshima Okugawa Yahata