A two-stage approach to Diesel emission management in Diesel HEV (Hybrid Electric Vehicles) is presented. The first aspect of the work focuses on a supervisory control strategy for charge-sustaining, parallel HEV drive-trains, which provides a real-time control policy for the use of a CIDI engine and an electric motor, while simultaneous minimizing fuel consumption and reducing NOx emissions. Results show that only limited, although not negligible, gains in NOx emission levels can be achieved through the optimal control of the HEV drive-train, necessitating an aggressive after-treatment strategy. In the second facet of the work, an after-treatment system is presented consisting of a set to parallel lean NOx traps and a novel set of actuators for providing heat and hydrocarbons independent of the engine control strategy. The proper control of this system is obtained by a relatively simple dynamic model of the NOx absorbers, coupled with a real-time estimator of the NOx engine-out emissions based on the engine operating points (set by the control strategy) and their transient behavior. The system shows the potential to decrease NOx emissions by 90%.
A 2-stage approach to diesel emission management in diesel hybrid electric vehicles
Ein zweistufiges Verfahren für das Abgasemissionsmanagement in Diesel/Elektro-Hybridmotoren
2002
6 Seiten, 6 Bilder, 6 Quellen
Conference paper
Storage medium
English
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