Nixon & Vanderhye P.C.
Exhaust gas purification system having particulate filter
An engine control unit of an exhaust gas purification system of an internal combustion engine measures a pressure difference between an upstream and a downstream of a diesel particulate filter (DPF) after heating the DPF at least to a predetermined temperature and maintaining the DPF at the temperature for a while. The DPF is disposed in an exhaust pipe of the engine. A soluble organic fraction included in particulate matters in exhaust gas can be eliminated at the predetermined temperature. The ECU calculates a quantity of the particulate matters trapped by the DPF from the measured pressure difference. Thus, the quantity of the trapped particulate matters is calculated precisely, independently of a composition of the particulate matters or a state of the soluble organic fraction.
Denso Corporation
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F01N F01N F02D F02D
inventional additional inventional additional
Makoto Kiyonori Tsukasa Shigeto Masumi
Saito Sekiguchi Kuboshima Yahata Kinugawa