Electrically Heated Catalyst (EHC) Development for Diesel Applications

Tahir, Nazir Muhammad; Miles, Brammer; Robert, Scholz; Florian, Zote; Bunar, Frank; Schrade, Friedemann

doi:10.20485/jsaeijae.6.4_127

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…q cell is proportional to D cell because . Q cell is proportional to the square of D cell , as shown in Equation (15). Thus, the slope of T s (x) in Equation ( 9) becomes independent of D cell .…”

Section: Effects Of Ehc Geometric Parameters On Surface Temperature D...mentioning

confidence: 99%

“…The EHC has been introduced as a measure to increase the operating temperatures of three-way catalysts (TWCs) in gasoline engines during the cold start [11][12][13]. It has also been applied to diesel oxidation catalysts (DOC) and urea-SCR systems to enhance the evaporation and decomposition performance of the urea-water solution, particularly in cold start conditions by increasing the exhaust gas temperature [14][15][16][17]. The evaporation and decomposition performance can be further enhanced by injecting the urea-water solution directly into the heater in the EHC so that the thermal energy of the heater can be used.…”

Section: Introductionmentioning

confidence: 99%

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Simplified Modeling and Analysis of Surface Temperature Distribution in Electrically Heated Catalyst for Diesel Urea-SCR Systems

et al. 2022

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Impending emission regulations of diesel engines for construction machineries would regulate nitrogen oxide emissions strictly in cold operating conditions. The urea-based selective catalytic reduction (urea-SCR) system coupled with the electrically heated catalyst (EHC) has been considered as a potential measure to meet the strict emission regulations by promoting evaporation and thermal decomposition of urea–water solution in cold operating conditions. Analyzing the thermal conditions in the EHC is crucial for the optimized operation and control of EHC-based urea-SCR systems under various engine operating conditions. In the current study, we introduce a simple one-dimensional analysis scheme to characterize the surface temperature distribution in the EHC based on energy conservation and the theories of forced internal convection. Since the EHC has a complicated internal structure with fine flow cells inside it, a flow cell in the EHC is extracted for the one-dimensional heat transfer analysis. EHC operation parameters such as exhaust gas flow rate and supplied electric power to the EHC are scaled to be applied for the flow cell analysis. The adequacy of the analysis scheme is then validated by surface temperature measurement results at the EHC outlet. The validation results showed over 95% prediction accuracy of the 1D analysis scheme in the operating conditions of a heavy-duty diesel engine. Based on proven reliability, the effects of geometric and operation parameters on the surface temperature distribution in the EHC were analyzed and discussed using the analysis results.

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Section: Effects Of Ehc Geometric Parameters On Surface Temperature D...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simplified Modeling and Analysis of Surface Temperature Distribution in Electrically Heated Catalyst for Diesel Urea-SCR Systems

et al. 2022

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Driving Hydrogen Engines towards a Zero-Impact Emission Level

Roiser,

Beringer,

Schutting

et al. 2024

Proceedings

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Catalyst Modeling Challenges for Electrified Powertrains

2021

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To meet the upcoming CO2 reduction challenges, the further electrification of vehicle powertrains is indispensable. In combination with the post-Euro 6 requirements for criteria pollutants, the exhaust system is expected to be more complex to allow for extremely low emissions under all driving conditions, potentially involving technologies such as electrical heating and phase-change materials. The longer ‘zero-flow’ operation of the exhaust system in hybrid applications and the associated light-out risk have demanding accuracy requirements for heat loss calculations and require additional thermal management strategies. This paper discusses the additional challenges posed with regard to catalyst modeling in the boundary conditions of electrified vehicles and the necessary improvements that go beyond the state-of-the-art techniques. Most of the necessary improvements are linked to advanced 3D modeling of the exhaust system components accounting for free convection and radiative heat transfer. Modeling of electrically assisted heating is demonstrated using a new approach involving a combined 3D electrical–thermal solver. Heat retention technologies with use of phase-change materials are also accounted for in these new-generation models. Finally, the need for a tighter integration of these high-fidelity models into a vehicle simulation framework is discussed.

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Electrically Heated Catalyst (EHC) Development for Diesel Applications

Cited by 5 publications

References 3 publications

Simplified Modeling and Analysis of Surface Temperature Distribution in Electrically Heated Catalyst for Diesel Urea-SCR Systems

Simplified Modeling and Analysis of Surface Temperature Distribution in Electrically Heated Catalyst for Diesel Urea-SCR Systems

Driving Hydrogen Engines towards a Zero-Impact Emission Level

Catalyst Modeling Challenges for Electrified Powertrains

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