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CUMMINS INC.

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Researchers Submit Patent Application, “METHOD FOR IMPROVING ACCURACY OF SENSOR OUTPUTS FOR MEASURING NOx, AND SYSTEM AND APPARATUS FOR SAME”, for Approval (USPTO 20190227043): Cummins Inc.

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08/14/2019 | 05:18pm EDT

2019 AUG 14 (NewsRx) -- By a News Reporter-Staff News Editor at Transportation Daily News -- From Washington, D.C., NewsRx journalists report that a patent application by the inventors Jackson, Prabhu (Columbus, IN); Borisuk, Paul Daniel (Nashville, IN), filed on January 23, 2018, was made available online on July 25, 2019.

The patent’s assignee is Cummins Inc. (Columbus, Indiana, United States).

News editors obtained the following quote from the background information supplied by the inventors: “In view of increasingly stringent regulation of emissions, there is an increasing need for better closed loop control of pollutants emitted in exhaust produced by operation in an engine, and for improvements in on board diagnostics (OBD) assessing the level of the emissions. One pollutant is NOx, and many engine systems utilize a NOx sensor mounted in the exhaust system to measure the amount of NOx concentration in the exhaust, and communicate the amount of NOx to the control system of the engine system. During the useful life of a typical NOx sensor, gradual fouling of the sensor’s catalytic material, as well as other conditions associated with increasing age of the sensor, may cause a decrease in the accuracy of the measurements made by the sensor, and so the actual NOx concentration in the exhaust is different from the NOx concentration reported by the sensor. Systems and methods have been developed for compensating for the change in sensitivity of the NOx sensor based on age of the sensor. However, improvements are still needed in the development of compensation factors that reduce bias resulting from aging of sensors.”

As a supplement to the background information on this patent application, NewsRx correspondents also obtained the inventors’ summary information for this patent application: “A method, system, and apparatus for improving accuracy of sensor measurements of one or more constituent levels in an exhaust from an engine are disclosed. The method and system comprise correction of measurements taken by the sensor, by applying to the reported sensor reading a gain correction factor developed by determination of prior actual sensor readings correlated with discrete sensor age levels, and constituent concentrations to which those sensors are exposed. The gain correction factor is determined by using test results from exposing a plurality of equivalent sensors of different service ages to different constituent levels. By applying the determined gain correction factor to the sensor’s reported measurements, the method, system, and apparatus change the measurements reported by the sensor based on the sensitivity of the sensor to different constituent levels at the service age of the sensor. As a result, bias may be reduced and a more accurate measure of actual constituent levels is provided.”

The claims supplied by the inventors are:

“1. A method for improving sensor accuracy for measuring at least one constituent in an exhaust produced by an engine, comprising: measuring the at least one constituent in the exhaust using a sensor; and changing the measurement based on a sensitivity of the sensor to different constituent levels at a service age of the sensor.

“2. The method of claim 1, wherein the changing is implemented in accordance with the following equation: NOx.sub.actual=NOx.sub.sensor.times.G, wherein NOx.sub.actual comprises an actual NOx constituent amount, NOx.sub.sensor comprises a NOx constituent amount as measured by the sensor, and G comprises a gain correction factor.

“3. The method of claim 2, wherein the service age is based upon an aggregate amount of time that the sensor has been operated.

“4. The method of claim 2, wherein the gain correction factor is determined by using test results from exposing a plurality of equivalent sensors of different service ages to different constituent levels.

“5. The method of claim 4, wherein the test results comprise a bias value for a group of the equivalent sensors having a given service age when exposed to a given constituent level.

“6. The method of claim 5, wherein the bias value is a mean value for the group of equivalent sensors.

“7. A system, comprising a control module operatively connected to an engine, and operatively connected to a sensor system for sensing at least one constituent in an exhaust from the engine, wherein the sensor system comprises a sensor; and the control module is configured to change a measurement made by the sensor based on sensitivity of the sensor to different constituent levels at a service age of the sensor.

“8. The system of claim 7, wherein the sensor is a first sensor positioned to detect engine-out constituent levels in the exhaust from the engine.

“9. The system of claim 8, wherein the sensor system comprises a second sensor positioned to detect system-out constituent levels from an aftertreatment system of the engine, and the control module is configured to change the measurement made by the respective sensor based on sensitivity of the respective sensor to different constituent levels at the service age of the respective sensor.

“10. The system of claim 7, wherein the changing is implemented in accordance with the following equation: NOx.sub.actual=NOx.sub.sensor.times.G, wherein NOx.sub.actual comprises an actual NOx constituent level, NOx.sub.sensor comprises a NOx constituent level as measured by the sensor, and G comprises a gain correction factor.

“11. The system of claim 10, wherein the gain correction factor is determined by using test results from exposing a plurality of equivalent sensors of different service ages to different constituent levels.

“12. The system of claim 11, wherein the test results comprise a bias value for a group of the equivalent sensors having a given service age when exposed to a given constituent level.

“13. The system of claim 12, wherein the bias value is a mean value for the group of equivalent sensors.

“14. An apparatus, comprising: a sensor disposed to detect at least one constituent in an exhaust from an engine; and a control module operatively connected to the engine and the sensor, wherein the control module is configured to change a measurement made by the sensor based on sensitivity of the sensor to different constituent levels in the exhaust at a service age of the sensor.

“15. The apparatus of claim 14, wherein the changing is implemented in accordance with the following equation: NOx.sub.actual=NOx.sub.sensor.times.G, wherein NOx.sub.actual comprises an actual constituent level, NOx.sub.sensor comprises a constituent level as measured by the sensor, and G comprises a gain correction factor.

“16. The apparatus of claim 14, wherein the service age is based upon an aggregate amount of time that the sensor has been operated.

“17. The apparatus of claim 14, wherein the gain correction factor is determined by using test results from exposing a plurality of equivalent sensors of different service ages to different constituent levels.

“18. The apparatus of claim 17, wherein the test results comprise a bias value for a group of the equivalent sensors having a given service age when exposed to a given constituent level.

“19. The apparatus of claim 18, wherein the bias value is a mean value for the group of equivalent sensors.

“20. The apparatus of claim 15, further comprising an aftertreatment system for treating the at least one constituent from the engine.”

For additional information on this patent application, see: Jackson, Prabhu; Borisuk, Paul Daniel. METHOD FOR IMPROVING ACCURACY OF SENSOR OUTPUTS FOR MEASURING NOx, AND SYSTEM AND APPARATUS FOR SAME. Filed January 23, 2018 and posted July 25, 2019. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220190227043%22.PGNR.&OS=DN/20190227043&RS=DN/20190227043

(Our reports deliver fact-based news of research and discoveries from around the world.)

Copyright © 2019 NewsRx LLC, Transportation Daily News, source Business Newsletters

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