System and method for NOx reduction optimization
First Claim
1. A method for controlling exhaust emissions from a combustion engine, the method comprising:
- determining a cost to operate a combustion engine including receiving a fuel price and a cost to operate an after-treatment device including receiving a reductant price;
comparing the cost to operate the combustion engine with the cost to operate the after-treatment device; and
at least one of adjusting one or more engine operating parameters and adjusting one or more after-treatment parameters, at least partially based on the comparison of the cost to operate the engine with the cost to operate the after-treatment device,wherein the one or more engine operating parameters determine a first mixture of exhaust emissions after combustion of fuel by the combustion engine, said one or more engine operating parameters comprising at least one of a fuel injector timing, an air-to-fuel ratio, an injection pressure, and a cooled exhaust gas recirculation airflow, andwherein the one or more after-treatment parameters determine a second mixture of exhaust emissions converted from the first exhaust emissions by the exhaust after-treatment device including a selective catalytic reduction device adapted to inject a reductant into the first exhaust emissions, said one or more after-treatment parameters comprising a reductant injection volume.
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Accused Products
Abstract
An engine controller determines the cost of operating a combustion engine and the cost of operating an emissions after-treatment device. Accordingly, the engine controller adjusts parameters for operation of the engine and the after-treatment device to ensure cost-effective use of the engine and the after-treatment device while complying with exhaust emissions requirements. In particular, the engine controller receives the price of fuel consumed by the engine and the price of reductant used by the after-treatment device to determine the respective cost of operation. Specifically, the fuel is diesel fuel used in a diesel engine; the reductant is urea use in a urea-based Selective Catalytic Reduction (SCR) system; and the regulated exhaust emissions is nitrogen oxide (NOx) emissions. The engine operating parameters may include cooled exhaust gas recirculation airflow, fuel injection timing, fuel injection pressure, and air-to-fuel ratio. The SCR system operating parameters may include the volume of urea injected.
83 Citations
29 Claims
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1. A method for controlling exhaust emissions from a combustion engine, the method comprising:
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determining a cost to operate a combustion engine including receiving a fuel price and a cost to operate an after-treatment device including receiving a reductant price; comparing the cost to operate the combustion engine with the cost to operate the after-treatment device; and at least one of adjusting one or more engine operating parameters and adjusting one or more after-treatment parameters, at least partially based on the comparison of the cost to operate the engine with the cost to operate the after-treatment device, wherein the one or more engine operating parameters determine a first mixture of exhaust emissions after combustion of fuel by the combustion engine, said one or more engine operating parameters comprising at least one of a fuel injector timing, an air-to-fuel ratio, an injection pressure, and a cooled exhaust gas recirculation airflow, and wherein the one or more after-treatment parameters determine a second mixture of exhaust emissions converted from the first exhaust emissions by the exhaust after-treatment device including a selective catalytic reduction device adapted to inject a reductant into the first exhaust emissions, said one or more after-treatment parameters comprising a reductant injection volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for controlling exhaust emissions from a combustion engine, the system comprising:
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a combustion engine adapted to produce a first mixture of exhaust emissions after combustion of fuel according to one or more engine operating parameters; an exhaust after-treatment device including a selective catalytic reduction device adapted to convert the first exhaust emissions to a second mixture of exhaust emissions according to one or more after-treatment parameters, said selective catalytic reduction device adapted to inject a reductant into the first exhaust emissions; and an engine controller adapted to control the engine and the after-treatment device, wherein the engine controller receives a fuel price to determine a cost to operate the engine and receives a reductant price to determine a cost to operate the after-treatment device, compares the cost to operate the engine with the cost to operate the after-treatment device, and at least one of adjusts the one or more engine operating parameters and adjusts the one or more after-treatment parameters, at least partially based on the comparison of the cost to operate the engine with the cost to operate the after-treatment device, wherein the one or more engine operating parameters comprises at least one of a fuel injector timing, an air-to-fuel ratio, an injection pressure, and a cooled exhaust gas recirculation airflow, and the one or more after-treatment parameters comprises a reductant injection volume. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification