Method and system for optimizing fuel and reductant consumption
First Claim
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1. A system for optimizing consumption of fuel and reductant for an internal combustion engine system, the system comprising:
- a combustion engine producing a flow of engine exhaust emissions;
a doser configured to introduce a reducing agent into the engine exhaust emissions flow;
a cost ratio determining module configured to determine a reductant-to-fuel cost ratio value from among plural predetermined reductant-to-fuel cost ratio values;
at least one exhaust after-treatment device including a selective catalytic reduction (SCR) catalyst adapted to convert the engine exhaust emissions to converted exhaust emissions through a reduction process utilizing the reducing agent; and
a mode determining module configured to determine an operating mode of the combustion engine and the after-treatment device based on both the determined reductant-to-fuel cost ratio value and a geographic position of a vehicle,wherein the exhaust emissions downstream the selective catalytic reduction (SCR) catalyst is below a target emissions level while operating in the determined operating mode.
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Abstract
An operation mode of an engine and after-treatment system is determined based on a reductant-to-fuel cost ratio. The operation mode optimizes fuel consumption and reductant consumption in an engine system including an internal combustion engine and a selective catalytic reduction (SCR) catalyst while satisfying a target emissions emission level.
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Citations
14 Claims
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1. A system for optimizing consumption of fuel and reductant for an internal combustion engine system, the system comprising:
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a combustion engine producing a flow of engine exhaust emissions; a doser configured to introduce a reducing agent into the engine exhaust emissions flow; a cost ratio determining module configured to determine a reductant-to-fuel cost ratio value from among plural predetermined reductant-to-fuel cost ratio values; at least one exhaust after-treatment device including a selective catalytic reduction (SCR) catalyst adapted to convert the engine exhaust emissions to converted exhaust emissions through a reduction process utilizing the reducing agent; and a mode determining module configured to determine an operating mode of the combustion engine and the after-treatment device based on both the determined reductant-to-fuel cost ratio value and a geographic position of a vehicle, wherein the exhaust emissions downstream the selective catalytic reduction (SCR) catalyst is below a target emissions level while operating in the determined operating mode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for optimizing consumption of fuel and reductant for an internal combustion engine system including a combustion engine producing a flow of engine exhaust emissions, a doser configured to introduce a reducing agent into the flow of engine exhaust emissions, and a selective catalytic reduction (SCR) catalyst adapted to convert the flow of engine exhaust emissions to converted exhaust emissions through a reduction process utilizing the reducing agent, the method comprising:
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determining, from among plural predetermined reductant-to-fuel cost ratio values, a reductant-to-fuel cost ratio value; and determining, using a, mode determining module, an operating mode of the combustion engine and the after-treatment device based on both the determined reductant-to-fuel cost ratio value and a geographic location of a vehicle, wherein after the step of determining the operating mode, the exhaust emissions downstream of the selective catalytic reduction (SCR) catalyst is below a target emissions level. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification