Method for operating an internal combustion engine
AssigneePerkins Engines Company Limited
InventorsChris Burgess, Kane Lok, Ben Icenhower
Life of this patent
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Abstract
The present invention refers to a method for operating an internal combustion engine in a transition operating mode, comprising the steps of determining an initial fuel oxidizer ratio threshold and a demanded fuel oxidizer ratio for a fuel mixture to be supplied to a combustion chamber of the engine. If the demanded fuel oxidizer ratio exceeds the initial fuel oxidizer ratio threshold, the engine is temporally operated in a raised response mode, in which a fuel oxidizer ratio threshold is increased from the initial fuel oxidizer ratio threshold to a raised fuel oxidizer ratio threshold, and a fuel mixture having the demanded fuel oxidizer ratio is supplied into the combustion chamber of the engine.
Claims9
A method for operating an internal combustion engine in a transition operating mode, the engine configured to receive a fuel mixture in a combustion chamber, the fuel mixture comprising a fuel medium and an intake air, the intake air including an oxidizer, the fuel medium having a mass, the oxidizer having a mass, the fuel mixture received by the engine having a fuel oxidizer ratio, the method comprising the steps of:
- setting a threshold for the fuel oxidizer ratio of the fuel mixture, the threshold equal to an initial threshold (iFORlimit) the IFORlimit a value at which an amount of particulates in an exhaust gas discharged from the engine does not exceed a predetermined particulate limit when the fuel oxidizer ratio does not exceed the IFORlimit;
- determining a demanded fuel oxidizer ratio (dFOR) of the fuel mixture to be supplied to the combustion chamber of the engine;
- if the demanded fuel oxidizer ratio (dFOR) exceeds the initial threshold (iFORlimit) while the engine is transitioning from operating at a first engine power to operating at a second engine power that is greater than the first engine power, temporally operating the engine in a raised response mode, in which the threshold for the fuel oxidizer ratio of the fuel mixture is increased from the initial threshold (iFORlimit) to a raised fuel oxidizer ratio threshold (rFORlimit) up to a first period of time (tlimit), and supplying the fuel mixture at the demanded fuel oxidizer ratio (dFOR) into the combustion chamber of the engine, wherein during tlimit the amount of particulates in an exhaust gas discharged from the engine does not exceed the predetermined particulate limit associated with the IFORlimit,
- wherein the fuel oxidizer ratio is a ratio of the mass of the fuel medium in the fuel mixture to the mass of the oxidizer in the fuel mixture, wherein the oxidizer is oxygen, wherein further the mass of the oxidizer is less than a mass of the intake air.
A fuel and intake air supply control device for an internal combustion engine configured to control a supply of a fuel mixture into a combustion chamber of the engine, the fuel mixture comprising a fuel medium and an intake air, the intake air including an oxidizer, the fuel medium having a mass, the oxidizer having a mass, the fuel mixture received by the engine having a fuel oxidizer ratio, the fuel and intake air supply control device comprising:
- a first means for setting a threshold for the fuel oxidizer ratio of the fuel mixture, the threshold equal to an initial fuel oxidizer ratio threshold (iFORlimit), the iFORlimit a value at which an amount of particulates in an exhaust gas discharged from the engine does not exceed a predetermined particulate limit when the fuel oxidizer ratio does not exceed the iFORlimit;
- and
- a second means for determining a demanded fuel oxidizer ratio (dFOR) of the fuel mixture to be supplied to the combustion chamber of the engine,
- wherein the fuel and intake air supply control device is configured to, if the demanded fuel air oxidizer (dFOR) exceeds the initial threshold (iFORlimit) while the engine is transitioning from operating at a first engine power to operating at a second engine power that is greater than the first engine power, temporally operate the engine in a raised response mode, in which the threshold for the fuel oxidizer ratio of the fuel mixture is increased from the initial fuel oxidizer ratio threshold (iFORlimit) to a raised fuel oxidizer ratio threshold (rFORlimit) up to a first period of time (tlimit), and to supply the fuel mixture at the demanded fuel oxidizer ratio (dFOR) into the combustion chamber of the engine, wherein during tlimit the amount of particulates in an exhaust gas discharged from the engine does not exceed the predetermined particulate limit associated with the iFORlimit,
- wherein the fuel oxidizer ratio is a ratio of the mass of the fuel medium in the fuel mixture to the mass of the oxidizer in the fuel mixture, wherein the oxidizer is oxygen, wherein further the mass of the oxidizer is less than a mass of the intake air.
Dependencies are inferred from the claim text.