Improving the NO_x reduction performance of an Euro VI d SCR System in real-world condition via nonlinear model predictive control

Abstract

This paper deals with the possibility of improving the urea dosage control for the Selective Catalytic Reduction Systems (SCR) of an Euro VI d diesel light commercial vehicle in order to increase [Formula: see text] after-treatment reduction performance. To this aim, first, we assess the effective emissions abatement performance for the appraised diesel vehicle via real-world experimental campaign, carried out according to the Real Driving Emissions (RDE) tests on urban, extra-urban and motorway road sections in Naples, Italy. Based on these real-world data, we derive a parameterized control-oriented model for the SCR system which is, then, exploited for the designing of an alternative urea injection logic which could be able to maximize the [Formula: see text] reduction efficiency while minimizing tailpipe ammonia slip. Specifically, the optimal AdBlue injection rate is designed according to a Nonlinear Model Predictive Control Approach which allows obtaining a proper trade-off between the [Formula: see text] abatement and the urea overdosing problem. The effectiveness of the proposed controller is evaluated by comparing the performance assessed for the appraised SCR system during the experimental tests with the ones achievable if the Euro VI diesel would be equipped with the proposed control strategy. Numerical simulation discloses the effectiveness of the NMPC controller in ensuring improved [Formula: see text] reduction with performance complying with the emissions norms, main in avoiding excessive ammonia slip and in guaranteeing a reduced feed ratio w.r.t. to the standard industrial SCR controller mounted on the vehicle.

Distributed MPC of vehicle platoons with guaranteed consensus and string stability

“…18-19. It can be seen that the inter-vehicle gap error is amplified as it propagates downstream. www.nature.com/scientificreports/ Remark 7 Note that the performance of the proposed control scheme should be assessed by high-fidelity tests 42 . However, the current experimental conditions of the Hardware-in-the-loop or small-scale vehicle are not yet available, and we will consider the experiment with Hardware-in-the-loop or small-scale vehicles in the future.…”

“…Similarly to (42), the position deviation of adjacent vehicles at time instant t 2 can be obtained as Base on inductive reasoning, the position deviation at the time instant t δ is…”

Experimental and Numerical Simulation of Catalyst Deactivation Caused by Transient Turbulence in Gradient Flow Field

“…The effect of K on catalyst deactivation is stronger than that of Na. Based on real driving emissions (RDE) tests conducted in urban, suburban, and highway sections in Naples, Italy, Alberto [29] derived a control-oriented model of the SCR system and then used this model to design an alternative urea injection logic that minimizes ammonia skid in the exhaust pipe while minimizing efficiency. Um Hyung Sik [30] conducted numerical simulation of urea decomposition chamber (UDC) in low pressure SCR system.…”

Investigation on the applicability of parameters identification of marine diesel engine SCR kinetic model based on Discrete-Grid algorithm

“…[1][2][3][4] However, marine engine combustion will produce a lot of harmful emissions such as particulate matter (PM), sulfur oxides (SOx), and nitrogen oxides (NOx), which cause severe pollution to the atmosphere and marine environment. [5][6][7][8][9][10][11] According to the statistics of the China Mobile Source Environmental Management Annual Report (2021), in 2020, the national non-road mobile sources discharged 163,000 tons of SO 2 , 425,000 tons of hydrocarbons (HC), 237,000 tons of PM, and 4.782 million tons of NOx. Among them, NOx emissions from ships accounted for 29.9%.…”