Interpretation of the Oscillating Signals of the Smart NOx Sensors Used in Urea Selective Catalyst Reduction Systems via Spectral Analysis

Chih Cheng Chou; Chia Jui Chiang; Yu Hsuan Su; Yong Yuan Ku

doi:10.4028/www.scientific.net/AMM.479-480.719

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 479-480Interpretation of the Oscillating Signals of the...

Interpretation of the Oscillating Signals of the Smart NO_x Sensors Used in Urea Selective Catalyst Reduction Systems via Spectral Analysis

Abstract:

The oscillating signals of NOx sensor observed in urea selective catalytic reduction (SCR) tests are explained via spectral analysis. The NOx sensor built by NGK / Continental requires decoding following the SAE J1939 protocol and thus higher harmonic induced by the discretization is observed in the spectral analysis. The reciprocating motion of the urea pump induces fluctuation of the ammonia dosage, which combined with the nonlinear characteristic from ammonia dosage to NOx downstream SCR result in oscillating NOx sensor readings with different amplitude. The cross-sensitivity of the NOx sensor to ammonia concentration for higher-than-stoichiometric ammonia dosage also results in oscillating NOx sensor signal at lower frequencies.

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Periodical:

Applied Mechanics and Materials (Volumes 479-480)

Pages:

719-723

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https://doi.org/10.4028/www.scientific.net/AMM.479-480.719

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Online since:

December 2013

Authors:

Chih Cheng Chou, Chia Jui Chiang, Yu Hsuan Su, Yong Yuan Ku

Keywords:

Decoding, Smart NO_x Sensor, Spectral Analysis

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