N O x sensor cross sensitivity model and simultaneous prediction of N O x and N H 3 slip from automotive catalytic converters under real driving conditions

This work presents the development of a model to capture the NOx sensors cross sensitivity behavior based on N O x sensor cell temperature, as well as a model do predict the slip of the NOx and NH3 after the SCR catalyst, as a way to reduce the error in the exhaust emissions estimation needed for fe...

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Bibliographic Details
Published in:International journal of engine research 2021-10, Vol.22 (10), p.3209-3218
Main Authors: Pla, Benjamín, Piqueras, Pedro, Bares, Pau, Aronis, André
Format: Article
Language:English
Subjects:
Ammonia
Automobiles
Automotive parts
Catalytic converters
Driving conditions
Engine tests
Error reduction
Exhaust systems
Light duty vehicles
Nitrogen oxides
Prediction models
Sensitivity
Sensitivity analysis
Sensors
Slip
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Summary:This work presents the development of a model to capture the NOx sensors cross sensitivity behavior based on N O x sensor cell temperature, as well as a model do predict the slip of the NOx and NH3 after the SCR catalyst, as a way to reduce the error in the exhaust emissions estimation needed for feedback SCR control strategies. The emissions prediction model is based on the different cross sensitivity behavior of two distinct NOx sensors. The proposed models were tested and compared on a fully instrumented engine test bench when applied in a Worldwide harmonized Light vehicles Test Cycle (WLTC) and a full map cycle. As a result, the proposed model showed for NOx sensors cross sensitivity estimation an overall improvement of 34.8% for sensor 1 and 31.0% for sensor 2, and in terms of emissions prediction an overall improvement of 36.3% for NOx and 45.5% for NH3 slip.
ISSN:1468-0874
2041-3149
DOI:10.1177/1468087420966406