Internal combustion engine control device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsAkira HOJO, Shingo KORENAGA
Life of this patent
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Abstract
An internal combustion engine control device is provided. An engine executes A/F oscillation that alternates between lean combustion and rich combustion every cylinder. If a reaction state between rich gas and lean gas inside an exhaust passage on the upstream side of a catalyst is judged to be low, the assignment of cylinders conducting lean combustion and cylinders conducting rich combustion is swapped, so that rich combustion is conducted by a #1 cylinder farthest away from the catalyst in terms of the length of the exhaust passage, and also so that lean combustion is conducted by a #2 cylinder closer to the catalyst than the cylinder that is farthest away.
Claims10
An internal combustion engine control device comprising:
- an internal combustion engine that includes a catalyst device in an exhaust passage;
- and
- a controller programmed to control the internal combustion engine, wherein
- the controller is further programmed to:
- execute A/F oscillation operation in which lean combustion is conducted in at least one cylinder and rich combustion is conducted in at least one other cylinder,
- detect a reaction state between rich gas and lean gas at a detection point inside the exhaust passage on an upstream side of the catalyst device, on the basis of a predetermined physical amount of exhaust gas of the internal combustion engine, and
- change combustion state assignment for at least one of the cylinders from lean combustion to rich combustion, or from rich combustion to lean combustion, on the basis of the reaction state.
Dependencies are inferred from the claim text.