Control device for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsNoriyuki Takada, Shinobu Ishiyama, Takashi Ogawa
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Abstract
A control device for an internal combustion engine is provided with: a variable valve driving mechanism capable of changing a working angle of an intake valve while keeping a maximum magnitude of lift and opening timing constant; a reduction catalyst which absorbs nitrogen oxide in exhaust during lean combustion and reduces the nitrogen oxide absorbed during rich combustion; and a control unit changing, according to a load on the internal combustion engine, an amount of advance of closing of the intake valve at the time of switching to rich combustion.
Claims5
A control device for an internal combustion engine comprising:
- a variable valve driving mechanism configured to change a working angle of an intake valve while keeping a maximum magnitude of lift and opening timing constant;
- a reduction catalyst which absorbs nitrogen oxide in exhaust during lean combustion and reduces the nitrogen oxide absorbed during rich combustion;
- and
- a control unit changing, according to a load on the internal combustion engine, an amount of advance of a timing of closing of the intake valve at a time of switching to rich combustion.
Dependencies are inferred from the claim text.