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Method of monitoring soot mass in a particulate filter and monitoring system for same with correction for active regeneration inefficiency

A particle filter, regeneration efficiency technology, applied in the direction of engine components, combustion engines, machines/engines, etc., can solve the problems of not being able to compensate for uneven combustion, not considering instant offsets, etc.

Inactive Publication Date: 2014-03-19
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is used during the soot loading of the filter, but cannot compensate for uneven combustion caused by active regeneration events because it does not account for the instantaneous offset between the predicted and actual soot mass

Method used

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  • Method of monitoring soot mass in a particulate filter and monitoring system for same with correction for active regeneration inefficiency
  • Method of monitoring soot mass in a particulate filter and monitoring system for same with correction for active regeneration inefficiency

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Embodiment Construction

[0040] Referring to the drawings, wherein like reference numerals designate like parts throughout the several views, figure 1 Engine 10 is shown having exhaust system 12 including particulate filter 14 . The monitoring system 16 for the particulate filter 14 is operable to monitor the amount of soot mass in the particulate filter 14 in order to ensure filter performance as well as improve overall fuel economy and reduce emissions.

[0041] The exhaust system 12 includes a diesel oxidation catalyst 18 that oxidizes and combusts hydrocarbons in an exhaust stream 20 exiting the engine 10 . The exhaust then flows through a selective catalytic reduction catalyst 22 which converts at least some of the nitrogen oxides in the exhaust stream 20 to water and nitrogen. The exhaust then flows from the inlet 24 of the filter 14 to the outlet 26 of the filter 14 and then exits the exhaust system 12 . Exhaust system 12 may be disposed with selective catalytic reduction catalyst 22 downstre...

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Abstract

A method of monitoring soot mass in a particulate filter of an exhaust system includes determining a pressure differential across the filter, obtaining a first soot mass estimate by fitting the determined pressure differential to a first stored database of measured or modeled pressure differentials and corresponding measured soot masses taken during filter regeneration using a substantially similar filter previously loaded following a complete filter regeneration, and obtaining a second soot mass estimate by fitting the determined pressure differential to a second stored database of measured or modeled pressure differentials and corresponding measured soot masses taken during filter regeneration using a substantially similar filter loaded following an incomplete filter regeneration. Actual soot mass is estimated by calculating a weighted sum of the first and second soot mass estimates with weighting based on operating parameters indicative of regeneration efficiency. A monitoring system for a particulate filter is also provided.

Description

technical field [0001] The present invention relates to a method of monitoring the quality of soot in a particulate filter and a monitoring system for such a filter. Background technique [0002] Particulate filters are designed to remove soot from an engine's exhaust stream. The engine is, for example, a diesel or gasoline internal combustion engine. When the accumulated soot reaches a predetermined amount, the filter is "regenerated", either actively by burning off the accumulated soot, or passively, for example by using a catalyst. Mathematical and empirical soot models have been used to estimate the amount of soot present in the filter to ensure timely treatment or regeneration of the filter. A soot model predicts the amount of soot in the filter based on the pressure drop of the exhaust flow through the filter (ie, the pressure difference across the filter). The accuracy of the soot model used is important because if too much soot is present, it will impair the funct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00
CPCF01N2900/0416F01N2900/1606F01N2560/08F01N9/002F01N2560/06F01N2900/0412Y02T10/47F01N2560/025Y02T10/40
Inventor R.阿达内斯M.阿达内斯R.J.达P.贾辛基维奇
Owner GM GLOBAL TECH OPERATIONS LLC