Ammonia injection optimization for selective catalytic reduction aftertreatment systems. (July 2021)

• Record Type: Journal Article
• Authors: Pla, Benjamin; Bares, Pau; Sanchis, Enrique; Aronis, André
• Is Part Of: International journal of engine research. Volume 22:Number 7(2021)
• Page Start: 2169
• Page End: 2179
• Publication Date: 2021-07
• Subjects: Selective catalytic reduction -- engine aftertreatment -- vehicle emissions; Engines -- Periodicals; 629.25
• DOI: 10.1177/1468087420933125
• Languages: English
• ISSNs: 1468-0874

Abstract

This work presents an optimized ammonia injection strategy for the Worldwide Harmonized Light Vehicles Test Cycle and its potential benefits in terms of NO x emissions and ammonia consumption in selective catalytic reduction. An optimization tool based on optimal control was used to improve the ammonia injection in the selective catalytic reduction with different NO x emission limits. This optimal control can be used in two ways: one to minimize NO x emission and another to reduce the ammonia consumption in the selective catalytic reduction. The optimized strategy and the standard ammonia injection strategy were tested and compared on a fully instrumented engine test bench when applied in a Worldwide Harmonized Light Vehicles Test Cycle. The results showed a considerable improvement in the use of the optimization tool. When compared to the standard calibration, the new injection strategy for the same amount of ammonia injection reduced NO x emissions by 13.7%, and for the same NO x concentration emissions 33.5% of ammonia consumption was saved.