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Harinath, Arvind
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Model-Based Approaches in Developing an Advanced Aftertreatment System: An Overview

SAE International Journal of Advances and Current Practices in Mobility

Cummins Inc.-Changsheng Su, Joseph Brault, Achuth Munnannur, Z. Gerald Liu, Sean Milloy, Arvind Harinath, David Dunnuck, Ken Federle
  • Journal Article
  • 2019-01-0026
Published 2019-01-15 by SAE International in United States
Cummins has recently launched next-generation aftertreatment technology, the Single ModuleTM aftertreatment system, for medium-duty and heavy-duty engines used in on-highway and off-highway applications. Besides meeting EPA 2010+ and Euro VI regulations, the Single ModuleTM aftertreatment system offers 60% volume and 40% weight reductions compared to current aftertreatment systems. In this work, we present model-based approaches that were systematically adopted in the design and development of the Cummins Single ModuleTM aftertreatment system. Particularly, a variety of analytical and experimental component-level and system-level validation tools have been used to optimize DOC, DPF, SCR/ASC, as well as the DEF decomposition device. The highlights of this work can be summarized as follows: a). internal dosing is more efficient than external dosing to control HC slip; High CPSI DOCs show better HC oxidation performance at high SV due to enhanced mass transfer; b). the adopted advanced DPF technologies enable greater ash capacity for long maintenance intervals; c). SCR performance was optimized with the use of a hydrothermally robust Cu-Zeolite catalyst coated on high CPSI substrates.
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Experimental and Modeling Study of Ash Impact on DPF Backpressure and Regeneration Behaviors

SAE International Journal of Engines

Cummins Emission Solutions-Yi Liu, Changsheng Su, James Clerc, Arvind Harinath
Cummins Inc-Leigh Rogoski
  • Journal Article
  • 2015-01-1063
Published 2015-04-14 by SAE International in United States
One field-returned DPF loaded with a high amount of ash is examined using experimental and modeling approaches. The ash-related design factors are collected by coupling the inspection results from terahertz spectroscopy with a calibrated DPF model. The obtained ash packing density, ash layer permeability and ash distribution profile are then used in the simulation to assess the ash impact on DPF backpressure and regeneration behaviors. The following features have been observed during the simulation: 1The ash packing density, ash layer permeability and ash distribution profile should be collected at the same time to ensure the accurate prediction of ash impact on DPF backpressure. Missing one ash property could mislead the measurement of the other two parameters and thus affects the DPF backpressure estimation.2The ash buildup would gradually increase the frequency for the backpressure-based active soot regeneration. However, the accumulated ash reduces the energy density during the regeneration event as well as adsorbing exotherm, lowering the thermal cracking risk.
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Analysis of Packaging Impact on Emission Catalyst Design

Cummins Emission Solutions-Yi Liu, Wei Chen, Matthew Henrichsen, Arvind Harinath
Published 2014-04-01 by SAE International in United States
Diesel emission aftertreatment system is usually designed to meet stringent packaging constraints, rendering a difficult situation to achieve perfect flow distribution inside the catalytic unit. The non-uniform flow pattern leads to a mal-distribution of flow velocity, temperature, and gas species in catalyst unit. Some catalysts are exposed to harsh working environment, while the rest catalysts are underutilized. This lowers the efficiency of overall catalyst unit and thus requires an oversized system to meet emission requirements. The flow mal-distribution also accelerates the uneven catalyst degradation, lowering the system durability. Hence, a quantitative description of packaging impact on catalyst performance is critical to assess the system efficiency and durability.In the present work, a mapping method is developed to combine catalyst performance with computational fluid dynamics (CFD) simulation. This method is used to analyze the performance and robustness of a SCR aftertreatment system using a series of packaging designs. The simulation results are validated by the engine test. A sensitivity study is carried out over critical parameters, including uniformity index, catalyst size and ANR. The simulation results indicate…
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