Oliff PLC
Exhaust gas control apparatus for internal combustion engine
An exhaust gas control apparatus for an internal combustion engine includes a NOX storage reduction catalyst, a selective catalytic reduction catalyst, and an electronic control unit configured to shift an operation state of the engine from a rich operation state to a lean operation state, in a case where an acquired temperature of the NOX storage reduction catalyst is higher than a storage limit temperature, and an acquired NH3 adsorption amount is equal to or larger than a lower limit adsorption amount when a lean operation restart request is made, and not to shift the operation state from the rich operation state to the lean operation state in a case where the acquired temperature of the NOX storage reduction catalyst is higher than the storage limit temperature and the acquired NH3 adsorption amount is smaller than the lower limit adsorption amount when the lean operation restart request is made.
TOYOTA JIDOSHA KABUSHIKI KAISHA
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Masataka Hiroshi Keiichiro Toshihiro
Ogushi Kobayashi Aoki Mori