Abstract
For the purpose of designing a reasonable control strategy for DOC-assisted DPF regeneration, a mathematical model that describes the thermal phenomenon both in a diesel oxidation catalyst (DOC) and diesel particulate filter (DPF) during regeneration is developed. All boundary conditions of this model are obtained by experiments. The effects of the main exhaust parameters such as exhaust mass flow rate, exhaust temperature, oxygen concentration and emission of reactants are investigated comprehensively. The effects of two main parameters of control strategy, DOC-out temperature and soot loading, are analyzed as well. To quantify the effects of relevant parameters, the fuzzy grey relational analysis method is utilized to evaluate the correlation coefficient of all factors to key indexes of DPF regeneration such as maximum temperature, maximum rate of temperature increase and regeneration duration. The results of this work will greatly reduce the complexity of analysis and enable more rational control strategy design of DOC–DPF regeneration systems.
Highlights
With more and more stringent emission regulations of vehicles, the particulate emissions of diesel engines has raised a huge challenge for engine manufacturers and automotive engineers [1,2]
Estimated kinetic parameters of a diesel oxidation catalyst under actual vehicle operChristopher Depcik and Dennis Assanis [28] built a one-dimensional model of DOC to ating conditions
The exhaust parameters including mass flow rate, temperature and composition of a specific diesel engine are measured on a test bench under different engine speeds and output powers
Summary
With more and more stringent emission regulations of vehicles, the particulate emissions of diesel engines has raised a huge challenge for engine manufacturers and automotive engineers [1,2]. There are rarely studies concerning the influences the of exhaust ences of exhaust characteristics and control strategy parameters to regeneration. Estimated kinetic parameters of a diesel oxidation catalyst under actual vehicle operChristopher Depcik and Dennis Assanis [28] built a one-dimensional model of DOC to ating conditions. Exhaust characteristics and control parameters which have significant implications for DPF regeneration are rarely investigated by researchers. The effects of main exhaust characteristics such as exhaust flow rate, oxygen concentration and emission of reactants, or control strategies such as DOC-out temperature and soot loading, have been investigated and their correlations with maximum temperature, maximum rate of temperature increase and regeneration duration of DPF have been evaluated utilizing the improved fuzzy grey relational analysis method. Based on the results of this work, a more reasonable control strategy and DOC-out temperature controller can be implemented which considers realistic exhaust conditions and DPF status
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