Controller and control method for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorRyuta Teraya
Life of this patent
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Abstract
An internal combustion engine includes a filter, which is configured to trap particulate matter in exhaust gas, an EGR passage, which connects a section of an exhaust passage that is upstream of the filter to an intake passage, and an EGR valve, which is configured to adjust a cross-sectional flow area of the EGR passage. A controller for the internal combustion engine includes processing circuitry, which is configured to execute a limiting process of limiting an opening degree of the EGR valve such that the opening degree is likely to decrease when an amount of the particulate matter trapped by the filter is great as compared to when the amount is small.
Claims7
A controller for an internal combustion engine, wherein the internal combustion engine includes a filter, which is configured to trap particulate matter in exhaust gas, an EGR passage, which connects a section of an exhaust passage that is upstream of the filter to an intake passage, and an EGR valve, which is configured to adjust a cross-sectional flow area of the EGR passage,
- the controller comprising processing circuitry, which is configured to
- execute an EGR control process of operating an opening degree of the EGR valve in accordance with an operating point of the internal combustion engine, thereby adjusting a flow rate of exhaust gas flowing into the intake passage from the EGR passage through an open-loop control, and
- execute a limiting process of limiting the opening degree of the EGR valve such that the opening degree is decreased more in at least part of a region of the operating point when an amount of the particulate matter trapped by the filter is greater as compared to when the amount is smaller, thereby preventing the flow rate of exhaust gas flowing into the intake passage from the EGR passage from becoming greater than a predetermined amount.
A control method for an internal combustion engine, wherein the internal combustion engine includes a filter, which is configured to trap particulate matter in exhaust gas, and an EGR passage, which connects a section of an exhaust passage that is upstream of the filter to an intake passage, the method comprising:
- controlling an opening degree of an EGR valve, thereby adjusting a cross-sectional flow area of the EGR passage, wherein the opening degree of the EGR valve is operated in accordance with an operating point of the internal combustion engine, thereby adjusting a flow rate of exhaust gas flowing into the intake passage from the EGR passage through an open-loop control;
- and
- limiting the opening degree of the EGR valve such that the opening degree is decreased more in at least part of a region of the operating point when an amount of the particulate matter trapped by the filter is greater as compared to when the amount is smaller, thereby preventing the flow rate of exhaust gas flowing into the intake passage from the EGR passage from becoming greater than a predetermined amount.
Dependencies are inferred from the claim text.