Increasing Exhaust Temperature of an Idling Light-Duty Diesel Engine through Post-Injection and Intake Throttling

Ozel, Tayyar; Hall, Matthew J.; Matthews, Ronald D.

doi:10.4271/2018-01-0223

Cited by 5 publications

(2 citation statements)

References 10 publications

(4 reference statements)

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“…However, extra fuel injection and early release of hot in-cylinder gas can maintain exhaust temperatures above 250 o C at low loads [28]. Fuel injection timing modulation and post-fuel injection can also be applied for improved exhaust thermal management with a moderate deterioration on fuel consumption [29,30]. Another fuel-inefficient engine-base technique is to use internal exhaust gas recirculation (IEGR) [31].…”

Section: Introductionmentioning

confidence: 99%

Utilizing Exhaust Valve Opening Modulation for Fast Warm-up of Exhaust After-treatment Systems on Highway Diesel Vehicles

Başaran

2020

International Journal of Automotive Science and Technology

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Current on-road vehicles are generally outfitted with exhaust after-treatment (EAT) systems to meet the stringent emission regulations. At cold start and low-loaded operations, those systems need to be warmed up above a threshold temperature (generally 250oC) for effective performance. High exhaust temperatures and high exhaust flow rates are required to accelerate the EAT warm up which are mostly not available at low-loaded diesel vehicle operations. Therefore, the objective of this work is to improve EAT warm up at low loads through utilizing exhaust valve opening (EVO) modulation which allows both elevated exhaust temperatures and exhaust flow rates. A 1-D engine simulation program is used to model the system which is set to operate at 1200 RPM engine speed and at 2.5 bar brake mean effective pressure (BMEP) engine load. Exhaust temperature can be increased above 250oC via either early or late EVO timings. Reduced expansion work in advanced EVO timings and increased pumping loss in retarded EVO timings require higher fuel consumption (up to 15 % and 20 %, respectively) to keep engine load constant. Those high fuel penalties reduce engine air-to-fuel ratio and rise exhaust temperature more than 55oC. Exhaust mass flow rate is improved up to 9 % in the system as well. The method increases exhaust gas energy up to 40 % and rises heat transfer rate to the EAT system up to 140 % compared to nominal condition. The technique is highly effective at heating up EAT systems, however, it also causes high fuel inefficiency which needs to be considered.

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Section: Introductionmentioning

confidence: 99%

Utilizing Exhaust Valve Opening Modulation for Fast Warm-up of Exhaust After-treatment Systems on Highway Diesel Vehicles

Başaran

2020

International Journal of Automotive Science and Technology

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“…Studies on DPF active regeneration using various methods have been conducted, and a method of fuel post-injection during the expansion process of the engine or a method using external heat sources such as electric heaters or burners has been widely employed. 10–13 However, the fuel post-injection method has drawbacks, that is, it needs an electronic fuel injection device to precisely control the time of fuel injection, and a part of the post-injected fuel may be introduced into the crank case, resulting in oil dilution. 14,15 The technology using external heat sources also has drawbacks, that is, it needs expensive additional devices.…”

Section: Introductionmentioning

confidence: 99%

Comparison of intake and exhaust throttling for diesel particulate filter active regeneration of non-road diesel engine with mechanical fuel injection pump

Pyo¹,

Kim

2020

International Journal of Engine Research

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Diesel particulate filter regeneration using intake and exhaust throttling is technically simple and economically efficient compared to other methods. The purpose of this study is to investigate not only the reasons for the increase in exhaust temperature during intake or exhaust throttling but also their feasibility as a diesel particulate filter regeneration technology. In this study, a non-road diesel engine having a mechanical fuel injection pump was used for experiments. The changes in exhaust temperatures were measured during intake and exhaust throttling for the no-load maximum revolutions per minute engine condition. The experimental results exhibited that both intake and exhaust throttling reduced the intake air mass flow rate and increased piston pumping, which then increased fuel consumption. These effects were the primary reasons for increasing the temperature of exhaust gases. In particular, intake throttling was more effective than exhaust throttling in terms of reducing the intake air mass flow rate. However, exhaust throttling caused larger pumping losses, resulting in higher fuel consumption. Furthermore, in case of exhaust throttling, engine combustion was possible even at high equivalence ratios because of the larger amounts of residual gases in the combustion chamber. In summary, exhaust throttling is more effective for regenerating a diesel particulate filter at a high temperature than intake throttling. In addition, this study verified the feasibility of diesel particulate filter regeneration using exhaust throttling through analyses of diesel particulate filter regeneration efficiency, fuel consumption, and exhaust concentration when regenerating the diesel particulate filter by increasing the exhaust temperature through exhaust throttling.

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Thermal Management of Exhaust Aftertreatment for Diesel Engines

Munnannur

Ottinger

Liu

2022

Handbook of Thermal Management of Engines

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Increasing Exhaust Temperature of an Idling Light-Duty Diesel Engine through Post-Injection and Intake Throttling

Cited by 5 publications

References 10 publications

Utilizing Exhaust Valve Opening Modulation for Fast Warm-up of Exhaust After-treatment Systems on Highway Diesel Vehicles

Utilizing Exhaust Valve Opening Modulation for Fast Warm-up of Exhaust After-treatment Systems on Highway Diesel Vehicles

Comparison of intake and exhaust throttling for diesel particulate filter active regeneration of non-road diesel engine with mechanical fuel injection pump

Thermal Management of Exhaust Aftertreatment for Diesel Engines

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