Patent ID: 6789527
Filing Date: 2004-09-14
Classification: F02D,F02P,Y02T

Abstract:
A method of adaptive knock control of a direct-gasoline-injection internal-combustion engine, comprising:operating the engine in at least two of homogeneous operating mode, homogeneous lean operating mode, stratified-charge operating mode, homogeneous stratified-charge operating mode, homogeneous antiknock operating mode, and catalytic converter heating operating mode, wherein; in the homogeneous operating mode, fuel is injected once into a combustion chamber in an intake stroke, an amount of fuel injected being metered so that the fuel/air ratio &lgr; is approximately 1; in the homogeneous lean operating mode, fuel is injected once into a combustion chamber in an intake stroke, an amount of fuel injected being metered so that the fuel/air ratio achieved is significantly greater than 1; in the homogeneous stratified-charge operating mode, fuel is injected into the combustion chamber in a compression stroke so that there is no uniform distribution of fuel; in the homogeneous stratified-charge operating mode, fuel is injected in both the intake stroke and the compression stroke, so that with a first injection a lean basic mixture distributed uniformly in the combustion chamber is produced, and during a second injection a rich, highly flammable stratified-charge cloud is deposited near a spark plug; in the homogeneous antiknock operating mode, fuel is injected in the intake stroke and in the compression stroke, and a retardation angle of a firing angle achieved because of knocking has exceeded a predetermined threshold; in the catalytic converter heating operating mode, fuel is injected into the combustion chamber in both the compression stroke and a combustion stroke; determining a retardation angle of a firing angle for knock control using one of an adaptable computation specification and an adaptive engine characteristics map, the adaptive characteristics map being subdivided into a plurality of ranges for at least one operating parameter, each of the plurality of ranges being assigned with a corresponding retardation angle, wherein one of a separate, dedicated adaptive engine characteristics map and a separate, dedicated adaptable computation specification is provided for each of the at least two operating modes; performing, in response to a change in the operating mode to a new operating mode, one of reading an instantaneous retardation angle from a corresponding adaptive engine characteristics map for the new operating mode and calculating an instantaneous retardation angle using a corresponding adaptive computation specification for the new operating mode; and one of storing retardation angles in the corresponding adaptive engine characteristics map and adapting the corresponding adaptive computation specification as a function of knocking of the internal combustion engine.