Development of NOx Sensors for Heavy Vehicle Applications

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A DOE CRADA was initiated in February 2000 between Ford Motor Company and the US Department of Energy's Oak Ridge National Laboratory (ORNL). The overall objective of the research agreement was to characterize the performance of emission sensors and identify potential areas of improvement and to develop improved insulating materials with a lower capacitance to minimize radio frequency (RF) interference. A bench-scale device was developed at ORNL to evaluate sensor performance. The test stand was designed to enable control of the gas composition, flow rate, and temperature. An air-actuated three-way valve was used to control the injection of the test ... continued below

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111 Kb

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Armstrong, T.R. & Soltis, R.E. January 18, 2002.

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Description

A DOE CRADA was initiated in February 2000 between Ford Motor Company and the US Department of Energy's Oak Ridge National Laboratory (ORNL). The overall objective of the research agreement was to characterize the performance of emission sensors and identify potential areas of improvement and to develop improved insulating materials with a lower capacitance to minimize radio frequency (RF) interference. A bench-scale device was developed at ORNL to evaluate sensor performance. The test stand was designed to enable control of the gas composition, flow rate, and temperature. An air-actuated three-way valve was used to control the injection of the test gas in order to elucidate the transient behavior of the sensor. The major finding from the studies was that transient test results showed that response time of the sensor to NO was highly dependent on the temperature. The time constant decreased with increasing gas temperature and achieved a constant valve of 610 ms for temperatures greater than or equal to 350 C. The steady-state valves O{sub 2} and NO{sub x} pumping currents were measured under steady-state conditions using a picoammeter. The measured pumping currents were extremely low and required an electrically quiet environment for accurate readings. ORNL developed also modified the existing insulator material to decrease its dielectric constant in order to reduce radio frequency interference from the internal heater. This was accomplished by adding low dielectric constant sintering aids to alumina.

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111 Kb

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  • Report No.: ORNL99-0566
  • Grant Number: DE-AC05-00OR22725
  • DOI: 10.2172/940393 | External Link
  • Office of Scientific & Technical Information Report Number: 940393
  • Archival Resource Key: ark:/67531/metadc901298

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 18, 2002

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 20, 2016, 2:02 p.m.

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Armstrong, T.R. & Soltis, R.E. Development of NOx Sensors for Heavy Vehicle Applications, report, January 18, 2002; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc901298/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.