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Methods for engine exhaust nox control using no oxidation in engine

A technology of engine and internal combustion engine, applied in the direction of engine control, electrical control, engine components, etc.

Inactive Publication Date: 2014-07-09
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the temperature of the three-way catalyst is too low to convert the exhaust gas feed stream NO to NO 2 storage of NO using conventional three-way catalysts at cooler engine operating conditions x Will NO x storage limited to utilize NO x trap exhaust gas feed stream NO 2

Method used

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  • Methods for engine exhaust nox control using no oxidation in engine
  • Methods for engine exhaust nox control using no oxidation in engine
  • Methods for engine exhaust nox control using no oxidation in engine

Examples

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Embodiment Construction

[0089] Referring now to the drawings, in which certain exemplary embodiments are depicted for purposes of illustration only and not for purposes of limitation,figure 1 is a schematic diagram depicting an internal combustion engine 10 and a control module 5 and an exhaust aftertreatment system 200 according to the present invention. Exemplary engines include multi-cylinder direct injection internal combustion engines having reciprocating pistons 22 attached to crankshaft 24 and movable within cylinders 20 that define variable volume combustion chambers 34 . It is known to operate engines with compression ignition or spark ignition. Additionally, known methods utilize either firing strategy within a single engine in order to adjust the strategy based on factors such as engine speed and load. Additionally, engines are known to operate under hybrid strategies, such as spark-assisted compression-ignition strategies. The present invention is intended to include these exemplary embo...

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PUM

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Abstract

The present invention relates to a method of engine exhaust NOx control without oxidation in an engine, in particular, a powertrain comprising an internal combustion engine having a combustion chamber and an aftertreatment system. A method for reducing NOx emissions in the powertrain comprising: monitoring an actual exhaust feedflow ratio of NO2 to NO; monitoring a desired exhaust feedflow ratio of NO2 to NO; comparing said actual exhaust feedflow ratio of NO2 to NO comparing the exhaust gas feed flow ratio to the desired exhaust gas feed flow ratio; and selectively initiating a NO2 generating cycle based on the comparison of the actual exhaust gas feed flow ratio of NO to NO to the desired exhaust gas feed flow ratio, which Injecting a mass of fuel into the combustion chamber after a combustion event is included.

Description

technical field [0001] The present invention relates to NO in internal combustion engines x Control of aftertreatment of emissions. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] Nitrogen oxide NO x is a known by-product of combustion. NO x Produced by nitrogen and oxygen molecules present in the engine intake air separated during high temperature combustion, NO x The rate of production includes known relationships to the combustion process, e.g., NO x The resulting higher rates are associated with higher combustion temperatures and longer exposure of air molecules to higher temperatures. [0004] NO x Once produced in the combustion chamber, the molecules can be converted back into nitrogen and oxygen molecules in exemplary devices known in the art within the broader class of aftertreatment devices. However, those of ordinary skill in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00F01N9/00
CPCF01N11/00Y02T10/22F01N2610/03F02D41/405F01N2610/02Y02T10/24Y02T10/44F02D41/1463B01D2255/102F01N2560/026B01D2251/2067F02D41/1461F02D41/3035Y02T10/47B01D53/9409F01N3/101B01D53/9495F02D41/0275F01N3/0842B01D2251/208F01N3/0814B01D2255/2092F01N2560/06F01N3/2066B01D53/90F01N3/035B01D2258/012F01N3/103B01D2255/104Y02T10/12Y02T10/40Y02A50/20
Inventor T.M.斯罗亚恩W.李D.J.克利里K.L.佩里M.B.维奥拉D.R.蒙勒
Owner GM GLOBAL TECH OPERATIONS LLC