Finnegan, Henderson, Farabow, Garrett & Dunner, LLP
Exhaust gas control apparatus for internal combustion engine
An exhaust gas control apparatus includes a fuel injection device, a NOx occlusion reduction catalyst, a fuel addition valve, an inflow gas adjustment device, and an electronic control unit. The electronic control unit executes a low flow rate reduction treatment for removing NOx occluded in the NOx occlusion reduction catalyst after fuel supply from the fuel injection device is stopped. The electronic control unit controls the inflow gas adjustment device such that a ratio of oxygen to the fuel added to the NOx occlusion reduction catalyst at a time when a temperature of the NOx occlusion reduction catalyst is below an activation temperature becomes higher than a ratio of oxygen to the fuel added to the NOx occlusion reduction catalyst at a time when the temperature of the NOx occlusion reduction catalyst is equal to or higher than the activation temperature during the low flow rate reduction treatment.
Toyota Jidosha Kabushiki Kaisha
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Kazuhiro Toshihiro Hiromasa
Umemoto Mori Nishioka