Development of an Actively Regenerating DPF System for Retrofit Applications

Joshi, Ajay; Chatterjee, Sougato; Sawant, Aniket; Akerlund, Claes; Andersson, S.; Blomquist, Micael; Brooks, Jeff; Kattan, Spiro

doi:10.4271/2006-01-3553

Cited by 18 publications

(5 citation statements)

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“…All three strategies were found to be equally effective with temperature rise attributed to an increase in the in-cylinder heat release. Singh et al 7 and Joshi et al 8 describe commonly implemented methods for increasing exhaust temperatures by injecting diesel fuel directly into the exhaust upstream of a diesel oxidation catalyst. Researchers including Brück et al 9 have also tried, with little success, using electric heaters to increase exhaust gas temperatures.…”

Section: Introductionmentioning

confidence: 99%

Fuel-efficient exhaust thermal management using cylinder throttling via intake valve closing timing modulation

Garg

Magee

Ding

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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Most diesel engines meet today’s strict NOx and particulate matter emission regulations using after-treatment systems. A major drawback of these after-treatment systems is that they are efficient in reducing emissions only when their catalyst temperature is within a certain range (typically between 250 °C and 450 °C). At lower engine loads this is a major problem as the exhaust temperatures are usually below 250 °C. The primary objective of this study was to analyze “cylinder throttling” via both delayed and advanced intake valve closure timing. The effect of cylinder throttling on exhaust gas temperatures, fuel consumption, in-cylinder combustion and emissions is outlined. A significant increase in turbine outlet temperature accompanied by a decrease in fuel consumption, NOx, and particulate matter emissions was observed. Both delayed and advanced intake valve closure timings were equally effective. The increase in exhaust gas temperatures was attributed to a drop in air flow through the engine, which resulted from a reduction in the volumetric efficiency via cylinder throttling. The increase in fuel efficiency resulted from a decrease in the pumping work through a reduction in air flow through the engine. Reductions in NOx are attributed to the combined effect of a lower in-cylinder temperature due to a reduction in piston-motion-induced compression and a shift to a more premixed combustion mode. Particulate matter emissions were also reduced as a result of additional premixing. At the 1200 RPM and 2.5 bar brake mean effective pressure (BMEP) operating point, both delayed and advanced intake valve closure timings resulted in a turbine outlet temperature increase from 195 °C to 255 °C accompanied by an increase in brake thermal efficiency of 1.5% (absolute) and a reduction in brake-specific NOx and particulate matter emissions by 40% and 30%, respectively.

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Section: Introductionmentioning

confidence: 99%

Fuel-efficient exhaust thermal management using cylinder throttling via intake valve closing timing modulation

Garg

Magee

Ding

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…1 is the schematic plot of the connection between the burner and engine. The pre-DOC can decrease the emission of HC and CO effectively during the operation of the diesel engine [4]; the DOC which is installed at the back of the burner has two advantages: On one hand, the burner can provide the working conditions for the DOC; in other words, the burner can be used to increase the exhaust temperature to DOC ignition temperature; On the other hand, combined heating-up can be realized by burner heating together with DOC catalyzed reaction heating, which provides the system with adjustable heating capacity in a relatively large range. The burners are mainly consisted of two steel drums, the internal and external steel drums.…”

Section: The Structural Design Of the Evaporation-type Dpf Regenerati...mentioning

confidence: 99%

Design and Experimental Research on Evaporation-Type DPF Regenerative Burner

Liu

Yao

Jiang

et al. 2012

AMM

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Diesel engine for automobile mainly adopts diesel particulate filter (DPF) method to deal with the exhaust particulate. In order to eliminate the particulate in the filter and complete DPF regeneration, the burner needs to be set at the entrance of DPF. This paper designs the evaporation-type DPF regenerative burner, and makes the bench and the real vehicle test. The test shows that the burner can complete DPF regeneration well within the working scope of the larger engine.

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“…Hydrocarbon dosers can also be used to inject fuel upstream of the DOC. 16,17 Roberts et al 18 experimentally observed a 30°C-80°C increase in engine outlet temperatures, and predicted up to a 100°C increase, via early exhaust valve opening (EEVO), at the cost of reduced brake thermal efficiency (BTE), and predicted that the engine outlet temperatures of many low load operating conditions can be increased above 250°C. Bharath et al 19 concluded from simulations that EEVO and exhaust cam phasing yield higher DOC conversion efficiencies with a deterioration in fuel economy.…”

Section: Introductionmentioning

confidence: 99%

Diesel engine aftertreatment warm-up through early exhaust valve opening and internal exhaust gas recirculation during idle operation

Gosala

Ramesh

Allen

et al. 2017

International Journal of Engine Research

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A large fraction of diesel engine tailpipe NOx emissions are emitted before the aftertreatment components reach effective operating temperatures. As a result, it is essential to develop technologies to accelerate initial aftertreatment system warm-up. This study investigates the use of early exhaust valve opening (EEVO) and its combination with negative valve overlap to achieve internal exhaust gas recirculation (iEGR), for aftertreatment thermal management, both at steady state loaded idle operation and over a heavy-duty federal test procedure (HD-FTP) drive cycle. The results demonstrate that implementing EEVO with iEGR during steady state loaded idle conditions enables engine outlet temperatures above 400°C, and when implemented over the HD-FTP, is expected to result in a 7.9% reduction in tailpipe-out NOx.

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Development of an Actively Regenerating DPF System for Retrofit Applications

Cited by 18 publications

References 1 publication

Fuel-efficient exhaust thermal management using cylinder throttling via intake valve closing timing modulation

Fuel-efficient exhaust thermal management using cylinder throttling via intake valve closing timing modulation

Design and Experimental Research on Evaporation-Type DPF Regenerative Burner

Diesel engine aftertreatment warm-up through early exhaust valve opening and internal exhaust gas recirculation during idle operation

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