Control apparatus for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorYoshihiro Okada
Life of this patent
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Abstract
Provided is a control apparatus for an internal combustion engine, which can favorably suppress an occurrence of abnormal combustion regardless of its operational conditions. An occurrence probability of abnormal combustion of the internal combustion engine (10) is obtained on the basis of a fuel dilution index. An expected value I of the number of occurrences of abnormal combustion per a predetermined time period is calculated on the basis of the occurrence probability of abnormal combustion. The upper limit value of a torque generated by the internal combustion engine (10) is limited low so that the expected value I does not exceed a predetermined tolerable value.
Claims9
A control apparatus for an internal combustion engine, comprising a controller that is configured to:
- obtain an occurrence probability of abnormal combustion of an internal combustion engine;
- calculate an expected value of the number of occurrences of the abnormal combustion per a predetermined time period, based on the occurrence probability of the abnormal combustion;
- and
- cause an upper limit value of a torque generated by the internal combustion engine to be lowered so that the expected value does not exceed a predetermined tolerable value.
A control apparatus for an internal combustion engine, comprising a controller that is configured to:
- obtain an occurrence probability of abnormal combustion of an internal combustion engine in relation to an operational region of the internal combustion engine;
- and
- cause an upper limit value of a torque generated by the internal combustion engine to be lowered so that a maximum probability point at which the occurrence probability reaches its maximum in the operational region moves to a position at which the occurrence probability becomes smaller or equal to a predetermined tolerable value,
- wherein the controller obtains a fuel dilution index that represents a degree of fuel dilution of oil attached to a wall surface in a cylinder of the internal combustion engine, and obtains the occurrence probability based on the fuel dilution index.
A control apparatus for an internal combustion engine, comprising:
- abnormal combustion probability obtaining means for obtaining an occurrence probability of abnormal combustion of an internal combustion engine;
- expected-value calculation means for calculating an expected value of the number of occurrences of the abnormal combustion per a predetermined time period, based on the occurrence probability of the abnormal combustion that is obtained by the abnormal combustion probability obtaining means;
- and
- torque limit means for causing an upper limit value of a torque generated by the internal combustion engine to be lowered so that the expected value that is calculated by the expected-value calculation means does not exceed a predetermined tolerable value.
A control apparatus for an internal combustion engine, comprising:
- abnormal combustion probability obtaining means for obtaining an occurrence probability of abnormal combustion of an internal combustion engine in relation to an operational region of the internal combustion engine;
- and
- torque limit means for causing an upper limit value of a torque generated by the internal combustion engine to be lowered so that a maximum probability point at which the occurrence probability reaches its maximum in the operational region moves to a position at which the occurrence probability becomes smaller or equal to a predetermined tolerable value,
- wherein the abnormal combustion probability obtaining means includes fuel dilution index obtaining means for obtaining a fuel dilution index that represents a degree of fuel dilution of oil attached to a wall surface in a cylinder of the internal combustion engine, and is means for obtaining the occurrence probability based on the fuel dilution index obtained by the fuel dilution index obtaining means.
Dependencies are inferred from the claim text.