1. Date of download: 10/21/2017
Copyright © ASME. All rights reserved.
From: Robust Separation of Signal Domain From Single Channel Mixed Signal Output of Automotive Urea Based Selective Catalytic Reduction Systems
J. Dyn. Sys., Meas., Control. 2013;136(1): doi: /
Figure Legend:
Illustration of single mode slip domain with slip domain transition during a HDT cycle. FTIRS signals show NOx and NH3 species individually. The cross sensitivity of the NOx sensor to NH3 is clear.

2. Date of download: 10/21/2017
Copyright © ASME. All rights reserved.
From: Robust Separation of Signal Domain From Single Channel Mixed Signal Output of Automotive Urea Based Selective Catalytic Reduction Systems
J. Dyn. Sys., Meas., Control. 2013;136(1): doi: /
Figure Legend:
Illustration of mixed mode slip with both NH3 and NOx in the slip stream, as confirmed by the FTIRS signals, for a deteriorating SCR catalyst

3. Date of download: 10/21/2017
Copyright © ASME. All rights reserved.
From: Robust Separation of Signal Domain From Single Channel Mixed Signal Output of Automotive Urea Based Selective Catalytic Reduction Systems
J. Dyn. Sys., Meas., Control. 2013;136(1): doi: /
Figure Legend:
Illustration of NOx slip creep behavior for a steady state operating condition

4. Date of download: 10/21/2017
Copyright © ASME. All rights reserved.
From: Robust Separation of Signal Domain From Single Channel Mixed Signal Output of Automotive Urea Based Selective Catalytic Reduction Systems
J. Dyn. Sys., Meas., Control. 2013;136(1): doi: /
Figure Legend:
Illustration of an NH3 slip signal with high frequency modulation influenced by open-loop, FG NOx based urea injection

5. Date of download: 10/21/2017
Copyright © ASME. All rights reserved.
From: Robust Separation of Signal Domain From Single Channel Mixed Signal Output of Automotive Urea Based Selective Catalytic Reduction Systems
J. Dyn. Sys., Meas., Control. 2013;136(1): doi: /
Figure Legend:
Prototypical signals for FG NOx, TP NOx, and TP NH3. NOx signals are always phase correlated, while the NH3 signal may become phase uncorrelated with the FG NOx signal.

6. Date of download: 10/21/2017
Copyright © ASME. All rights reserved.
From: Robust Separation of Signal Domain From Single Channel Mixed Signal Output of Automotive Urea Based Selective Catalytic Reduction Systems
J. Dyn. Sys., Meas., Control. 2013;136(1): doi: /
Figure Legend:
Performance of SDM for slip transition from NOx to NH3 over a standard HD-FTP cycle. The transition from NOx slip only to NH3 slip only is easily confirmed by the FTIRS signals.

7. Date of download: 10/21/2017
Copyright © ASME. All rights reserved.
From: Robust Separation of Signal Domain From Single Channel Mixed Signal Output of Automotive Urea Based Selective Catalytic Reduction Systems
J. Dyn. Sys., Meas., Control. 2013;136(1): doi: /
Figure Legend:
HD-FTP tests with a straight pipe. The straight pipe is equivalent to a missing SCR and simulates the extreme case of a fully deteriorated SCR.

8. Date of download: 10/21/2017
Copyright © ASME. All rights reserved.
From: Robust Separation of Signal Domain From Single Channel Mixed Signal Output of Automotive Urea Based Selective Catalytic Reduction Systems
J. Dyn. Sys., Meas., Control. 2013;136(1): doi: /
Figure Legend:
SDM response over an off-cycle test drive under the influence of NOx slip creep with transition to NH3 slip