Nox formation prediction for improved catalytic converter control

A catalytic converter and processor technology, applied in electrical control, engine control, fuel injection control, etc., can solve problems such as lagging oxygen levels

Inactive Publication Date: 2020-04-17
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when making downstream measurements, even if the sensor is in close proximity to the converter, the measurement necessarily lags behind the oxygen level in the converter

Method used

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  • Nox formation prediction for improved catalytic converter control
  • Nox formation prediction for improved catalytic converter control
  • Nox formation prediction for improved catalytic converter control

Examples

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Embodiment Construction

[0023] An example method for a vehicle and exhaust system may generally employ a predictive method for NOx level or concentration changes in a catalytic converter. More specifically, one or more real-time vehicle operating parameters may be used to predict deviations, eg, expected increases, in NOx production. In some example approaches, a model trained with emissions laboratory data may be used to actively predict high NOx formation in an engine based on real-time operating parameters. Thus, when a high likelihood of increased NOx formation is predicted, proactive measures can be taken to reduce NOx emissions. In some examples discussed further below, an example processor may signal an increase based on predicted NOx formation, and the signal may be used to adjust engine operating conditions, such as the air-fuel ratio of the engine. As a result, the predicted increase in NOx formation is at least partially reduced or even eliminated. In contrast to the example method using...

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Abstract

Methods of treating exhaust in a vehicle, and exhaust systems for a vehicle, are disclosed. Example methods may include providing a catalytic converter in an exhaust tailpipe and an oxygen sensor downstream of the catalytic converter. The catalytic converter may be configured to reduce a concentration of a nitrogen oxide (NOx) present in an exhaust flow through the catalytic converter. The methodfurther includes predicting an increase in an oxygen concentration within the catalytic converter based upon at least one or more real-time vehicle operating parameters, wherein the increase is predicted before a corresponding increase in oxygen concentration is measured by the downstream oxygen sensor. The method may also include adjusting an air-fuel ratio of an engine of the vehicle based uponthe predicted increase in oxygen concentration, thereby at least partially preventing the corresponding increase in the oxygen concentration.

Description

technical field [0001] The present disclosure relates to NOx formation prediction for improved catalytic converter control. Background technique [0002] Catalytic converters can reduce emissions, including nitrogen oxides (NOx), in the exhaust stream from internal combustion engines. A typical three-way catalytic converter usually contains a catalyst material that reduces NOx to nitrogen (N 2 ), which oxidizes carbon monoxide (CO) to carbon dioxide (CO 2 ) and oxidizes unburned hydrocarbons (HC) to carbon dioxide and water (H 2 O). Oxygen (O 2 ) is a required input to the catalytic converter, so the amount of oxygen in the catalytic converter must be controlled during vehicle operation. Oxygen levels outside a given control window will cause at least some NOx emissions to slip through the converter and possibly to the environment. Therefore, catalytic converter control systems typically must closely monitor the oxygen level in the catalytic converter. [0003] NOx fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N11/00F02D41/02F02D41/14
CPCF01N3/20F01N11/007F02D41/0235F02D41/1405F02D41/1454F02D41/1475B01D53/9495B01D2258/01F01N3/10F01N9/00F01N2430/06F01N2560/025F01N2900/08F02D41/1458F02D41/1462F02D41/18F02D2041/1412Y02T10/40Y02A50/20B01D53/9454F01N3/101F02D2200/024F02D2200/0414F02D2200/101
Inventor 耿健阳J·A·赫尔米克R·F·哈特
Owner GM GLOBAL TECH OPERATIONS LLC
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