Control device for internal combustion engines

The control device estimates and manages catalyst oxygen storage capacity to prevent emissions deterioration by stopping rich control before harmful gases are discharged, addressing the issue of emissions deterioration during fuel cut in internal combustion engines.

JP7856068B2Active Publication Date: 2026-05-11TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOYOTA JIDOSHA KK
Filing Date
2023-08-15
Publication Date
2026-05-11

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Abstract

To provide a control device for an internal combustion engine capable of estimating an oxygen storage possible amount of a catalyst while suppressing deterioration of emissions.SOLUTION: A control device is for an internal combustion engine in which a catalyst is provided in an exhaust passage. The control device for the internal combustion engine includes: a control section that executes rich control for controlling an air-fuel ratio in the internal combustion engine after fuel cut to a rich air-fuel ratio; a first estimation section that estimates an oxygen storage possible amount of the catalyst from start of the rich control until the air-fuel ratio of exhaust gas discharged from the catalyst becomes the rich air-fuel ratio; a second estimation section that estimates an oxygen storage amount of the catalyst during execution of the rich control; and a stop section that stops the rich control when the oxygen storage amount becomes less than a determination value that is smaller than the oxygen storage possible amount.SELECTED DRAWING: Figure 3
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