Ignition timing control apparatus and ignition timing control method for internal combustion engine
First Claim
1. An ignition timing control apparatus for an internal combustion engine, comprising:
- a learning portion that sets a learning value of an ignition timing when the internal combustion engine is in a given operating state, by executing a learning control, wherein the learning value is used in an ignition timing control executed when the internal combustion engine is in another operating state;
an estimated knocking occurrence ignition timing setting portion that sets an estimated knocking occurrence ignition timing based on a most retarded ignition timing using the learning value, wherein the most retarded ignition timing is set based on an operating state of the internal combustion engine; and
a final ignition timing setting portion that sets a final ignition timing, by executing a feedback correction process in which a correction amount is based on whether knocking occurs when ignition is performed at the estimated knocking occurrence ignition timing,wherein when a point indicating the operating state of the internal combustion engine moves into a region where it is difficult to set the estimated knocking occurrence ignition timing, the final ignition timing setting portion changes the correction amount by a predetermined amount, to a changed correction amount, so as to retard the final ignition timing, and sets the final ignition timing using the learning value and the changed correction amount, andwherein the region where it is difficult to set the estimated knocking occurrence ignition timing is a low load region in which an engine load is low.
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Accused Products
Abstract
In an ignition timing control apparatus for an engine, a KCS learning value learned when the engine is in a given operating state is used in an ignition timing control executed when the engine is in the other operating state. An estimated knocking occurrence ignition timing is set based on a most retarded ignition timing using the KCS learning value. A final ignition timing is set by changing a KCS feedback correction value based on whether knocking occurs when ignition is performed at the estimated knocking occurrence ignition timing. When a point indicating the engine operating state moves into a region where it is difficult to set the estimated knocking occurrence ignition timing, the KCS feedback correction value is changed to retard the final ignition timing, and the final ignition timing is set using the KCS learning value and the changed KCS feedback correction value.
26 Citations
9 Claims
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1. An ignition timing control apparatus for an internal combustion engine, comprising:
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a learning portion that sets a learning value of an ignition timing when the internal combustion engine is in a given operating state, by executing a learning control, wherein the learning value is used in an ignition timing control executed when the internal combustion engine is in another operating state; an estimated knocking occurrence ignition timing setting portion that sets an estimated knocking occurrence ignition timing based on a most retarded ignition timing using the learning value, wherein the most retarded ignition timing is set based on an operating state of the internal combustion engine; and a final ignition timing setting portion that sets a final ignition timing, by executing a feedback correction process in which a correction amount is based on whether knocking occurs when ignition is performed at the estimated knocking occurrence ignition timing, wherein when a point indicating the operating state of the internal combustion engine moves into a region where it is difficult to set the estimated knocking occurrence ignition timing, the final ignition timing setting portion changes the correction amount by a predetermined amount, to a changed correction amount, so as to retard the final ignition timing, and sets the final ignition timing using the learning value and the changed correction amount, and wherein the region where it is difficult to set the estimated knocking occurrence ignition timing is a low load region in which an engine load is low. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An ignition timing control method for an internal combustion engine, comprising:
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setting an estimated knocking occurrence ignition timing based on a most retarded ignition timing using a learning value of an ignition timing learned by a learning control when the internal combustion engine is in a given operating state, wherein the most retarded ignition timing is set based on an operating state of the internal combustion engine; setting a final ignition timing by executing a feedback correction process in which a correction amount is based on whether knocking occurs when ignition is performed at the estimated knocking occurrence ignition timing; and determining whether a point indicating the operating state of the internal combustion engine moves into a region where it is difficult to set the estimated knocking occurrence ignition timing; wherein when it is determined that the point indicating the operating state of the internal combustion engine moves into the region where it is difficult to set the estimated knocking occurrence ignition timing, the correction amount is changed by a predetermined amount, to a changed correction amount, so as to retard the final ignition timing, and the final ignition timing is set using the learning value and the changed correction amount, and wherein the region where it is difficult to set the estimated knocking occurrence ignition timing is a low load region in which an engine load is low.
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Specification