Nixon & Vanderhye P.C.
Exhaust gas purification system of internal combustion engine
An electronic control unit (ECU) calculates a pressure loss in an exhaust passage downstream of a diesel particulate filter (DPF) fluctuating in accordance with an operating state of an engine based on the operating state as a pressure loss in the exhaust passage constituting a part of a difference between an atmospheric pressure and an absolute pressure of exhaust gas flowing through the DPF. The ECU converts a mass flow rate of the exhaust gas flowing through the DPF into a volumetric flow rate based on the obtained absolute pressure. Thus, the volumetric flow rate can be calculated correctly regardless of fluctuation in the operating state, and a deposition state of exhaust particulate matters can be calculated highly accurately. Thus, regeneration of the DPF can be performed at appropriate timing.
Denso Corporation
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Makoto Shigeto
Saito Yahata