System and method for NOx reduction optimization

a technology of optimization system and optimization method, applied in the field of nox reduction, can solve the problems of reducing fuel efficiency, placing fuel efficiency on the fuel, and high fuel price, so as to reduce the content of nox, reduce the temperature at combustion, and reduce the effect of nox conten

Active Publication Date: 2007-07-19
CUMMINS INC
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Benefits of technology

The technical effect of this patented technology is to reduce nitrogen oxide (NO) emissions from diesel engines without compromising their performance. By controlling certain factors like EGR or fuel injection, it can help to decrease NOx emissions while maintaining good fuel economy. However, with increased usage of urea-based systems, there are advantages over current techniques due to its ability to optimize fuel consumption based on costs and emissions levels.

Problems solved by technology

This patent describes various technical problem addressed in this patent text relating to the challenge of optimizing the performance of diesel engines while minimizing emissions. One approach involves injecting urea into the exhaust gas of the diesel engine, allowing the urea to mix with the exhaust gases before being introduced into the engine. By doing this, the urease reaction becomes less important, resulting in reduced NOx production. Another approach involves using urea-based SCR systems, which improve NOx reduction compared to traditional methods like selective catalyst reduction systems.

Method used

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  • System and method for NOx reduction optimization
  • System and method for NOx reduction optimization
  • System and method for NOx reduction optimization

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Embodiment Construction

[0029]Engine controllers, such as ECM's, currently do not account for the monetary cost of operating the engine and the monetary cost of operating an after-treatment system. More specifically, price inputs for fuel and reductants, such as urea, are not currently specified for ECM algorithms. As a result, no ECM's, or the vehicles that use them, are able to dynamically adjust the use of fuel and reductants, such as urea, to achieve cost-effective operation of the vehicle while complying with emissions regulations.

[0030]The following presents a detailed description of a system and method that determines the optimal operating parameters for an engine and an emissions after-treatment device according to the cost of operating the engine and the after-treatment device. To demonstrate the features of the present invention, the present invention is discussed in terms of an exemplary embodiment implementing an ECM to reduce total NOx exhaust emissions from a diesel engine by determining appropr

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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.

Description

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Claims

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Application Information

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Owner CUMMINS INC
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