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Exponentially weighted moving averaging filter with adjustable weighting factor

A weighting factor, moving average technology, applied in engine components, combustion engines, engine control, etc., to solve problems such as exceeding the threshold

Active Publication Date: 2014-08-20
GM GLOBAL TECH OPERATIONS LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the filter value calculated by the EWMA filter may exceed the threshold even after the NOx sensor has been repaired or replaced

Method used

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  • Exponentially weighted moving averaging filter with adjustable weighting factor
  • Exponentially weighted moving averaging filter with adjustable weighting factor
  • Exponentially weighted moving averaging filter with adjustable weighting factor

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Embodiment Construction

[0046]The following description is merely exemplary in nature and is not intended to limit the disclosure, its application or uses. It should be understood that throughout the drawings, corresponding reference numerals identify similar or corresponding parts and features. As used herein, the term "module" refers to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or grouped), and a memory or combinational logic circuit that executes one or more software or firmware programs .

[0047] see now figure 1 , the exemplary embodiment relates to a diagnostic system 10 for an exhaust treatment system 12 including an exhaust pipe 20 , a nitrogen oxide (“NOx”) sensor 22 , a malfunction indicator light (“MIL”) 26 and a control module 30 . The control module 30 communicates with the NOx sensor 22 and the MIL 26 . The NOx sensor 22 monitors exhaust gas 32 produced by an internal combustion engine (not shown) and generates a signal...

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Abstract

A method of increasing a weighting factor of an exponentially weighted moving averaging (“EWMA”) filter is provided. The method includes monitoring a data stream containing raw data values, and determining an EWMA value based on the data stream by an electronic control module. The method includes determining if the EWMA value is between a predetermined maximum fault threshold value and a predetermined minimum fault threshold value. The method includes increasing the weighting factor of the EWMA filter to more heavily weigh incoming raw data values of the data stream based on the difference between the first raw data value and a previously calculated filtered value exceeding the calibration value.

Description

[0001] Cross References to Related Applications [0002] This patent application claims priority to US Provisional Patent Application Serial No. 61 / 718,409 filed October 25, 2012, which is hereby incorporated by reference in its entirety. technical field [0003] Exemplary embodiments of the present invention relate to systems and methods for increasing the weighting factors of an Exponentially Weighted Moving Average ("EWMA") filter, and more particularly, to increasing the weighting factors to more heavily weight the input raw data of a data stream Value systems and methods. Background technique [0004] Exponentially weighted moving average ("EWMA") filtering is a data processing technique used to reduce variability in a monitored data input stream over a period of time. EWMA filters calculate average or filtered values ​​based on raw data points collected from a data input stream. In one approach, EWMA filtering may be used to filter filtered data collected by nitrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
CPCG06F17/18F01N11/00F01N2560/026F02D41/146F02D41/222F02D2041/1432Y02T10/40
Inventor J·E·科瓦尔科夫斯基I·安妮洛维奇J·J·钟
Owner GM GLOBAL TECH OPERATIONS LLC
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