Method for operating an internal combustion engine
AssigneeRobert Bosch GmbH
InventorsRoland Karrelmeyer, Christina Sauer, Wolfgang Fischer, Juergen Haering
Life of this patent
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Abstract
A method for operating an internal combustion engine working according to the Otto principle, in which fuel, particularly gasoline, is injected directly into a combustion chamber and is inflamed by self-ignition. A characteristic quantity characterizing the stability of combustion of an air/fuel mixture located in the combustion chamber is ascertained, and, as a function of the characteristic quantity, a residual gas proportion in the cylinder associated with the combustion chamber is set, in particular minimized, the residual gas proportion being reduced, preferably iteratively, as long as the characteristic quantity does not fall below a specifiable stability boundary.
Claims15
A method for operating an internal combustion engine working according to the Otto principle, the method comprising:
- injecting fuel directly into a combustion chamber for inflaming the fuel by self-ignition;
- ascertaining a characteristic quantity characterizing a stability of combustion of an air/fuel mixture located in the combustion chamber, wherein a stable range for operation corresponding to the characteristic quantity has a lower stability boundary;
- and
- setting, as a function of the characteristic quantity, a residual gas proportion in a cylinder associated with the combustion chamber, the residual gas proportion being iteratively reduced as long as the characteristic quantity does not fall below the lower stability boundary.
A computer-readable medium having a computer program which is executable by a processor, comprising:
- a computer program arrangement having program code for operating an internal combustion engine working according to the Otto principle by performing the following:
- injecting fuel directly into a combustion chamber for inflaming the fuel by self-ignition;
- ascertaining a characteristic quantity characterizing a stability of combustion of an air/fuel mixture located in the combustion chamber, wherein a stable range for operation corresponding to the characteristic quantity has a lower stability boundary;
- and
- setting, as a function of the characteristic quantity, a residual gas proportion in a cylinder associated with the combustion chamber, the residual gas proportion being iteratively reduced as long as the characteristic quantity does not fall below the lower stability boundary.
A control unit for operating an internal combustion engine working according to the Otto principle, comprising:
- an injecting arrangement for injecting fuel directly into a combustion chamber for inflaming the fuel by self-ignition;
- a determining arrangement for ascertaining a characteristic quantity characterizing a stability of combustion of an air/fuel mixture located in the combustion chamber, wherein a stable range for operation corresponding to the characteristic quantity has a lower stability boundary;
- and
- a setting arrangement for setting, as a function of the characteristic quantity, a residual gas proportion in a cylinder associated with the combustion chamber, the residual gas proportion being iteratively reduced as long as the characteristic quantity does not fall below the lower stability boundary.
Dependencies are inferred from the claim text.