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Method and engine system for operating an engine

A technology of engine and rate of change, which is applied in the field of ammonia leakage detection and can solve problems such as time lag

Active Publication Date: 2019-03-22
FORD GLOBAL TECH LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since this method uses a segment of each sensor signal for processing, there is a difference between collecting each NOx sensor output signal and allocating downstream NOx sensor output to NOx and NH 3 time lag between

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  • Method and engine system for operating an engine
  • Method and engine system for operating an engine
  • Method and engine system for operating an engine

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Embodiment Construction

[0020] The following instructions relate to the detection of NH from an SCR system based on a transient NOx signal detected in the SCR system. 3 Methods and systems for disclosure. In one example, the described method includes predicting a tailpipe NOx slope using information from two NOx sensors, a feedgas sensor upstream of an SCR and a tailpipe sensor downstream of an SCR, in response to a transient feedgas NOx signal. In one specific example, the disclosed segment length method further includes comparing the predicted (or expected) downstream NOx rate of change with the measured downstream NOx rate of change via the segment length method, and The state signal distributes the output from the NOx sensor to each of ammonia and nitrogen oxides in different amounts. For simplicity and clarity, when the ratio of the measured downstream NOx rate of change relative to the expected downstream NOx rate of change exceeds a threshold 3 The allocation allocates more of the NOx sensor...

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Abstract

The present invention relates to methods and engine systems for operating an engine. Systems and methods for detecting ammonia leaks in an exhaust system based on transient NOx sensor responses are described. In one example method, the exhaust system distributes the tailpipe NOx sensor output to NOx and NH in response to the transient sensor using the segment length method that processes the transient signal based on the total segment length calculated within a window. 3 level. For the measured NOx change rate and the expected NOx change rate downstream of the SCR, the ratio of the segment length relative to the threshold is determined, and the NOx change rate is further used to determine NOx and NH based on the measured sensor activity. 3 probability, and includes a controller for adjusting one or more parameters based on distribution and changes in sensor output.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of U.S. Patent Application No. 13 / 859,435, "Enhanced Real-Time Ammonia Leak Detection," filed April 9, 2013, the entire contents of which are hereby incorporated by reference into this application for all Purpose. technical field [0003] The present application generally relates to ammonia leak detection for exhaust treatment systems included in the exhaust system of an internal combustion engine. Background technique [0004] Diesel vehicles may be equipped with an exhaust gas treatment system which may include, for example, a urea-based selective catalytic reduction (SCR) system and one or more exhaust gas sensors, such as nitrogen oxide (NOx) sensors, among which At least one of the may be provided downstream of the SCR system. When the SCR system becomes full with urea to the saturation point, the SCR system can begin to leak ammonia (NH 3 ), where the saturation point...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N11/00
CPCF01N9/00F01N3/2066F01N3/208F01N9/002F01N2560/021F01N2560/026F01N2560/14F01N2610/02F01N2900/04F01N2900/0421F01N2900/0601F01N2900/1616Y02T10/12Y02T10/40B01D53/9431B01D53/9495F01N11/00
Inventor F·考皮克斯D·潘娜拉D·尤帕德雅H·吴
Owner FORD GLOBAL TECH LLC
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