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Enhanced real-time ammonia slip detection

A rate-of-change, downstream technology, applied in the field of ammonia leak detection, which can solve problems such as time lag

Active Publication Date: 2015-10-14
FORD GLOBAL TECH LLC
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  • Summary
  • 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

Method used

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  • Enhanced real-time ammonia slip detection
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  • Enhanced real-time ammonia slip detection

Examples

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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 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 ou...

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Abstract

The invention relates to enhanced real-time ammonia slip detection. Systems and methods for detecting ammonia slip in an exhaust system based upon transient NOx sensor responses are described. In one example method, an exhaust system allocates tailpipe NOx sensor output to NOx and NH3 levels responsive to the transient sensors using a segment length method that processes the transient signals based on the total segment lengths calculated within a window. A ratio of segment lengths relative to a threshold is determined for a measured and expected NOx rate of change downstream of an SCR that is further used to determine a probability of NOx and NH3 based on the measured sensor activities, and a controller is included to adjust one or more parameters based on the allocation and changes of 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 Applications(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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