Cycle-Driven Optimization of a Fixed-Structure Controller for Urea Dosing in a Mobile SCR System Loughborough University

Format:

Book

Conference/Event

Author/Creator:

Olowojebutu, Seun, author.

Contributor:

Steffen, Thomas

Conference Name:

Automotive Technical Papers (2020-01-01 : Warrendale, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2020

Summary:

A model-based urea-dosing controller has been developed for the selective catalytic reduction (SCR) units on a diesel engine exhaust aftertreatment system (EATS). The SCR units consist of an integrated SCR-coated filter and then followed by a flow-through SCR catalyst. The controller was developed based on an analysis of the data generated from a Millbrook London Transport Bus (MLTB) test cycle fed into a validated model of the SCR-filter and SCR units. The critical system parameters that showed strong correlation with outlet nitrogen oxides (NOx) and ammonia (NH3) emissions were first identified, and then the sensitivity of those parameters was analyzed. The most sensitive system parameters were configured as the controller gain parameters. A proportional controller based on the key parameters with optimized gains settings for the MLTB cycle delivered over a 10% reduction in cumulative NOx emission over the cycle compared to a fixed NH3/NOx ratio (ANR) controller. The controller was shown to be robust to errors in sensor measurement in that it delivered significantly less variation in performance compared to a fixed ANR controller

Notes:

Vendor supplied data

Publisher Number:

2020-01-5106

Access Restriction:

Restricted for use by site license