System and method for controlling ignition timing for internal combustion engine
First Claim
1. A system for controlling ignition timing for a vehicular internal combustion engine, comprising:
- (a) first means for detecting engine operating conditions;
(b) second means for setting a basic ignition timing on the basis of the engine operating conditions;
(c) third means for determining whether the engine is transferred into a transient operating state on the basis of the engine operating conditions and for deriving an engine rotational angle (MBT) with respect to a top dead center of at least one cylinder at which pressure in a combustion chamber thereof has reached its maximum;
(d) fourth means for determining whether the basic ignition timing exceeds the engine rotational angle (MBT) in an advance angle direction when the engine is transferred into the transient operating state;
(e) fifth means for deriving whether the engine rotational speed is increased or decreased when the basic ignition timing exceeds the engine rotational angle (MBT), for correcting the basic ignition timing in the advance angle direction when the engine rotational speed is increased, and for correcting the basic ignition timing in a retardation angle direction when the engine rotational speed is decreased; and
(f) sixth means for igniting air-fuel mixture supplied into each cylinder of the engine at a timing determined by the fifth means.
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Accused Products
Abstract
A system and method for controlling ignition timing for a vehicular internal combustion engine in which when the engine is transferred to a transient operating state (accelerated or decelerated), a correction for the basic ignition timing determined according to engine operating conditions is reversed depending on whether the basic ignition timing advance angle exceeds a MBT (Minimum advance for a Best Torque) ignition timing angle such that, on condition that the basic ignition advance angle exceeds the MBT ignition timing angle, the basic ignition timing advance angle is advanced when the engine rotational speed is increased and is retarded when the engine rotational speed is decreased, thus suppressing the generation of shuddering vibrations generated by the engine.
15 Citations
20 Claims
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1. A system for controlling ignition timing for a vehicular internal combustion engine, comprising:
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(a) first means for detecting engine operating conditions; (b) second means for setting a basic ignition timing on the basis of the engine operating conditions; (c) third means for determining whether the engine is transferred into a transient operating state on the basis of the engine operating conditions and for deriving an engine rotational angle (MBT) with respect to a top dead center of at least one cylinder at which pressure in a combustion chamber thereof has reached its maximum; (d) fourth means for determining whether the basic ignition timing exceeds the engine rotational angle (MBT) in an advance angle direction when the engine is transferred into the transient operating state; (e) fifth means for deriving whether the engine rotational speed is increased or decreased when the basic ignition timing exceeds the engine rotational angle (MBT), for correcting the basic ignition timing in the advance angle direction when the engine rotational speed is increased, and for correcting the basic ignition timing in a retardation angle direction when the engine rotational speed is decreased; and (f) sixth means for igniting air-fuel mixture supplied into each cylinder of the engine at a timing determined by the fifth means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for controlling ignition timing for a vehicular internal combustion engine, comprising:
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(a) first means for detecting engine operating conditions ; (b) second means for determining a basic ignition timing advance angle on the basis of the detected engine operating conditions; (c) third means for deriving a torque-advance map representing a curve of an engine torque with respect to an ignition timing advance angle according to an engine load and engine temperature included in the engine operating conditions when the engine is transferred in a transient operating state detected by the first means; (d) fourth means for deriving an MBT ignition timing advance angle at which a minimum advance for a best torque is achieved from a physical quantity related to a combustion vibration energy based on an internal cylinder pressure detected by the first means; (e) fifth means for deriving a required change rate of the engine torque according to a change rate of the engine rotational speed; (f) sixth means for deriving a correction quantity for the ignition timing angle from the curve derived by the third means according to the required change rate of the torque, engine load, and engine temperature; (g) seventh means for determining a final ignition timing advance angle from the map with the correction quantity such that the final ignition timing is advanced when the change rate of the engine rotational speed indicates positive and when the basic ignition timing advance angle exceeds the MBT ignition timing advance angle in the advance angle direction and is retarded when the change rate of the engine rotational speed indicates negative and when the basic ignition timing advance angle exceeds the MBT ignition timing advance angle in the advance angle direction; and (h) eighth means for igniting air-fuel mixture supplied into each cylinder at a timing determined by the seventh means. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method for controlling ignition timing for a vehicular internal combustion engine, comprising the steps of:
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(a) detecting engine operating conditions; (b) setting a basic ignition timing on the basis of the engine operating conditions; (c) determining whether the engine is transferred into a transient operating state on the basis of the engine operating conditions and deriving an engine rotational angle (MBT) with respect to a top dead center of at least one cylinder at which pressure in a combustion chamber thereof has reached its maximum; (d) determining whether the basic ignition timing exceeds the engine rotational angle (MBT) in an advance angle direction when the engine is transferred into the transient operating state; (e) deriving whether the engine rotational speed is increased or decreased when the basic ignition timing exceeds the engine rotational angle (MBT), correcting the basic ignition timing in the advance angle direction when the engine rotational speed is increased, and correcting the basic ignition timing in a retardation angle direction when the engine rotational speed is decreased; and (f) igniting air-fuel mixture supplied into each cylinder of the engine at a timing determined in the step (e).
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Specification