Investigation of Exhaust Emissions from DI Diesel Engine During Cold and Warm Start

Bielaczyc, Piotr; Merkisz, Jerzy; Pielecha, Jacek

doi:10.4271/2001-01-1260

Cited by 63 publications

(27 citation statements)

References 3 publications

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“…For PM, since the low temperature does not favors the oxidation of formed particle, the EFs for vehicles at the start-up phase significantly increase compared with those in the normal idling mode. These results for real-world startup emission test are generally similar with what was reported in bench test (Bielaczyc et al, 2001). For PM carbonaceous compositions, EF OM significantly increases by 237% while EF EC slightly increases by 39%.…”

Section: Start-up Emissionsupporting

confidence: 79%

Real-World Emission from In-Use Construction Equipment in China

Peng

Tan

et al. 2016

Aerosol Air Qual. Res.

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In-use emission factors of 11 pieces of construction equipment were collected using a portable emission measurement system. These vehicles include excavators, bulldozers and loaders. Both regulated pollutants and PM carbonaceous compositions were tested. The emission factors of CO, HC, NO x and PM for these vehicles are 13-91 g kg -1 , 12-63 g kg -1 , 1.4-27 g kg -1 , and 2.5-13 g kg -1 respectively. Their fuel consumption rates are also provided. The vehicles in the idling mode are higher in the emission factors of CO and HC than those in the other operating modes. The vehicles certified to different emission standards are significantly different in PM carbonaceous compositions. The analysis by GC-MS shows that the majority of particle-phase PAHs from these vehicles are 2-or 3-ring PAHs, while high-molecular-weight PAHs are seldom detected. There is a great difference in the emission factors of PM and OM between the vehicles at the start-up phase and those in the normal idling mode. Some conclusions and recommendations are made by comparing this study with some others.

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Section: Start-up Emissionsupporting

confidence: 79%

Real-World Emission from In-Use Construction Equipment in China

Peng

Tan

et al. 2016

Aerosol Air Qual. Res.

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“…Ignoring the cold start emissions influences the instantaneous and total emission results but this holds particularly true for the CO and HC emissions, which are not considered in this study. On the other hand, engine-out NO (and NO x ) emissions during cold starting for the present engine are rather low, owing to the low gas temperatures involved, and may actually be overestimated by the present methodology [2,4,26,31]. Figure 4 is demonstrated in Figures 7-9 regarding performance and emission results from the turbocharged diesel-powered vehicle, the technical details of which were given in Table 3.…”

Section: Discrepancies During Transient Operationmentioning

confidence: 99%

Investigation of a Diesel-Engined Vehicle’s Performance and Emissions during the WLTC Driving Cycle—Comparison with the NEDC

Giakoumis

Zachiotis

2017

Energies

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Abstract:The present work presents results from an experimentally validated simulation code, regarding a turbocharged diesel-powered vehicle running on the recently developed worldwide light-duty vehicles WLTC driving cycle. The simulation is based on an engine mapping approach, with correction coefficients applied vis-Ò-vis the transient discrepancies encountered. Both performance and engine-out emission results are presented and discussed. As regards the latter, the concerned pollutants are soot and nitrogen monoxide. Since the WLTC driving cycle is scheduled to replace the NEDC in Europe from September 2017 with regard to the certification of passenger cars and light-duty trucks, a comparative analysis between the two test schedules is also performed for the engine/vehicle under study.

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“…However, long cranking periods, the emission of large amounts of unburned hydrocarbons (HCs) which appear as white smoke, unstable combustion and even complete engine failure to start [1][2][3][4] are considered as major problems that need to be solved.…”

Section: Chapter 1 Literature Reviewmentioning

confidence: 99%

Opposing effects of recirculated gases during cranking on cold start of diesel engines

Rofail

Henein

Bryzik

2011

Proceedings of the Institution of Mechanical Engineers, Part D:

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The effect of recirculating engine-out gases into the intake manifold on the cold start of direct-injection diesel engines is investigated. Two types of recirculation are examined. The first is low-pressure recirculation of engine-out gases into the intake manifold where their rate is controlled by a gas recirculation (GR) valve installed between the exhaust and intake manifold. The second is high-pressure recirculation by restricting the flow of the engine-out gases using a butterfly (BF) valve, installed in the exhaust system after the turbocharger to increase the back pressure and the rate of recirculated gases. Since there is no combustion during cranking, these gases contain evaporated hydrocarbons and partial oxidation products, mostly formaldehyde (HCHO). Experimental investigations on a four-cylinder direct-injection diesel engine indicated that high rates of cranking gas recirculation (CGR) increase the ignition delay and lengthen the cranking period. Since higher concentrations of hydrocarbons (HC) are expected to enhance the autoignition process, it is suspected that the recirculated HCHO would have an opposite effect. These opposing effects are investigated using the ChemKin diesel cycle simulation model. The model results demonstrated the effect of HCHO on slowing the autoignition and combustion reactions.

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Investigation of Exhaust Emissions from DI Diesel Engine During Cold and Warm Start

Cited by 63 publications

References 3 publications

Real-World Emission from In-Use Construction Equipment in China

Real-World Emission from In-Use Construction Equipment in China

Investigation of a Diesel-Engined Vehicle’s Performance and Emissions during the WLTC Driving Cycle—Comparison with the NEDC

Opposing effects of recirculated gases during cranking on cold start of diesel engines

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