Limiting NOX emissions using two catalysts

Inactive Publication Date: 2017-09-07
INT ENGINE INTPROP CO LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes an exhaust aftertreatment system for a compression ignition engine that allows for quick power increase while keeping NOx emissions below a certain level. It also includes various methods to control engine operation and fueling to achieve effective aftertreatment, and to use catalysts to reduce NOx in exhaust gas during both steady state and transient operation. Additionally, an active hydrocarbon injector can be used to further enhance NOx reduction. Overall, this technology provides a solution for reducing harmful emissions from compression ignition engines and improving their performance.

Problems solved by technology

TWCs become ineffective in reducing NOx in exhaust when oxygen is present.
However, TWCs experience reduced performance as they age, even with robust catalyst materials.
The lean air / fuel mixture creates exhaust having a significant amount of oxygen that renders TWCs ineffective in reducing NOx.
Exhaust gas also functions as a diluent that is heated and thereby results in lower combustion temperature in the combustion chamber.
However, operating a compression ignition engine with significant exhaust gas reduces the power created by the engine due to the limited amount of fuel that is combusted during such operation.
A shortcoming of current compression ignition engines and their associated aftertreatment systems is that they cannot achieve both keeping the NOx emissions below a predetermined level in a fuel-efficient manner during steady state operations, and also keeping the NOx emissions below the predetermined level during transient engine operation such as during accelerations or increased power of the engine.

Method used

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  • Limiting NOX emissions using two catalysts
  • Limiting NOX emissions using two catalysts
  • Limiting NOX emissions using two catalysts

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Embodiment Construction

[0026]Embodiments described herein concern control of a compression ignition engine and aftertreatment of exhaust created by the engine. In particular, embodiments concern control of a compression ignition engine to limit emission of NOx when the engine operates to produce power at or near its capacity. In addition, embodiments concern improving transient response to requests for increased power by a compression ignition engine that has exhaust gas recirculation and limiting emission of nitrogen and oxygen compounds.

[0027]Embodiments will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments are shown. Like reference numbers refer to like elements throughout. Other embodiments may, however, be in many different forms and are not limited to the embodiments set forth herein. Rather, these embodiments are examples. Rights based on this disclosure have the full scope indicated by the claims.

[0028]FIG. 1 shows a schematic depiction of a com...

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Abstract

A method for controlling an internal combustion engine limits emission of undesirable compounds of nitrogen and oxygen and provides increased transient power.

Description

RELATED APPLICATIONS[0001]This application is a continuation-in-part of co-pending U.S. application Ser. No. 13 / 629,197, having a filing date of Sep. 27, 2012.FIELD[0002]This disclosure relates to operation of a compression ignition internal combustion engine and exhaust aftertreatment to limit emission of nitrogen oxides. Embodiments relate to transient increased power operation of the engine.BACKGROUND[0003]Internal combustion engines are widely used to power electric generators, vehicle engines, and the like. Emissions from internal combustion engines and their impact on the environment are of increasing concern. Because of this concern, regulations that limit the amount of various emission gases that may be exhausted to the environment from these engines have been adopted. Specific attention has been directed to reducing emissions of nitrogen and oxygen compounds, including NO and N2O, that are collectively referred to as NOx. These compounds are formed by in the combustion cham...

Claims

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Application Information

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IPC IPC(8): F01N3/10F01N3/20
CPCF01N3/20F01N3/101F01N3/106F01N3/208F01N9/00F01N2570/14F02D41/0235F02D41/10F02D2250/32F02D2250/36F01N3/103F01N3/021F01N13/009Y02T10/12
InventorCATTANI, LUIS CARLOSUCHANSKI, MICHAELRODIGUEZ, ROGELIOCHEN, JER SHEN JASONCIGLER, JAMES R.KHADILKAR, DILEEPSCHIPPER, JEREMY GRANTSEIBERLICH, MATTHEW JOSEPHSINGH, NISHANTSILVA, JOAO P.ADELMAN, BRADLEY JAYMANDARAPU, SILPA
OwnerINT ENGINE INTPROP CO LLC