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Vol. 32, No. 8(2), S&M2292

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Sensors and Materials, Volume 26, Number 5 (2014)
Copyright(C) MYU K.K.
pp. 313-318
S&M996 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2014.986
Published: June 30, 2014

Identification of Cross-Sensitivity of Smart NOx Sensors to Ammonia in Urea-Selective Catalyst Reduction Systems via Fast Fourier Transform [PDF]

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

(Received December 24, 2013; Accepted March 6, 2014)

Keywords: smart NOx sensor, cross-sensitivity, fast Fourier transform, spectral analysis, urea-selective catalyst reduction

The smart NOx sensor (SNS) is prevailingly used in exhaust after-treatment systems such as urea-selective catalytic reduction (SCR) to monitor the concentration of NOx emission. Owing to the cross-sensitivity of SNS to ammonia concentration, however, the sensor signal suffers significant interference and leads to false reading if excessive ammonia is present. In this paper, an effective method that avoids the cross-sensitivity of SNS to ammonia is proposed on the basis of a periodic modulation of the urea dosage rate and Fast Fourier Transform (FFT) of the SNS signal. This method enables us to measure the true NOx concentration correctly even if the NOx is overkilled by excessive ammonia.

Corresponding author: Chia-Jui Chiang


Cite this article
Chih-Cheng Chou, Chia-Jui Chiang, Yu-Hsuan Su and Yong-Yuan Ku, Identification of Cross-Sensitivity of Smart NOx Sensors to Ammonia in Urea-Selective Catalyst Reduction Systems via Fast Fourier Transform, Sens. Mater., Vol. 26, No. 5, 2014, p. 313-318.

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