Development of an experimental test bench and a psychrometric model for assessing condensation on a low-pressure exhaust gas recirculation cooler

Galindo, José; Garcia, Roberto; Tarí, Daniel; Moya, Francisco Navarro

doi:10.1177/1468087420909735

Cited by 17 publications

(12 citation statements)

References 42 publications

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“…Ko et al [7] showed that a low ambient temperature highly affected NO x and CO emissions in a Euro 6 diesel engine. Luján et al [8] also discussed this result, who also found a penalty in fuel consumption close to 10% running driving cycles at −7 • C. Despite the interest for the combination of high-pressure (HP) and low-pressure (LP) exhaust gas recirculation (EGR) [9], extremely cold temperatures can also lead to a decrease the EGR rate, as discussed by Galindo et al [10] regarding condensation in the LP-EGR path. In a similar way, operation at high altitude penalizes the engine performance concerning the combustion [11] and gas exchange processes [12], as well as emissions [13].…”

Section: Introductionmentioning

confidence: 88%

Analysis of the Driving Altitude and Ambient Temperature Impact on the Conversion Efficiency of Oxidation Catalysts

et al. 2021

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Worldwide emission standards are extending their requirements to cover engine operation under extreme ambient conditions and fill the gap between the type-approval and real driving conditions. The new ambient boundaries affect the engine performance and raw emissions as well as the efficiency of the exhaust aftertreatment systems. This study evaluates the impact of high altitude and low ambient temperature on the light-off temperature and conversion efficiency of an oxidation catalyst. The results are compared in a common range of exhaust mass flow and temperature with the baseline sea-level operation at 20 °C. A reduction of CO and HC conversion efficiencies was found at 2500 m and −7 °C, with a relevant increase of the light-off temperature for both of the pollutants. The analysis of the experimental data was complemented with the use of a catalyst model to identify the causes leading to the deterioration of the CO and HC light-off. The use of the model allowed for identifying, for the same exhaust mass flow and temperature, the contributions to the variation of conversion efficiency caused by the change in engine-out emissions and tailpipe pressure, which are, in turn, manifested in the variation of the reactants partial pressure and dwell time as governing parameters.

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Section: Introductionmentioning

confidence: 88%

Analysis of the Driving Altitude and Ambient Temperature Impact on the Conversion Efficiency of Oxidation Catalysts

et al. 2021

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“…Cylinder deactivation [7][8][9][10][11] methods are also fairly widely known. However, in addition to a whole number of cylinders, individual cycles [12][13][14][15][16][17] can also be deactivated. This impacts the fuel supply and gas distribution units [18].…”

Section: Introductionmentioning

confidence: 99%

Environmental control of the technical condition of electromagnetic nozzles of internal combustion engines

Гриценко

Shepelev

Grakov

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Harmful motor vehicle emissions are often the primary source of urban air pollution worldwide. Incorrectly serviced high-mileage motor vehicles emit significantly more harmful substances into the atmosphere than established by accepted standards. This paper presents an algorithm for the process of diagnostics and analysis of the technical condition of the fuel supply system elements for internal combustion engines (ICE) by means of selective sampling of exhaust gases. A gas analyzer system allows for the simultaneous monitoring of the 4 components of exhaust gases: CO, CH, O2 and CO2, assessment of the air-fuel ratio and internal combustion engine crankshaft rotation speed. Studies were carried out on an engine and a series of malfunctions were created artificially, by means of installing faulty elements and additional elements simulating different degrees of wear on the ICE systems. The study resulted in the development of a method and a hardware and software system. These allow for the test regimes to be established, in order to determine the failure of ICE systems which affect the composition of the exhaust gas.

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“…Nevertheless, the use of HP EGR to reduce the NO x levels presents some issues, as per example the appearance of condensation and fouling depositions resulted of a degraded combustion, specially working at low temperatures. 13,14 The soot particles can affect the main components of the EGR line (i.e. EGR valve, EGR cooler, intake manifold) reducing its life span.…”

Section: Introductionmentioning

confidence: 99%

Impacts of the exhaust gas recirculation (EGR) combined with the regeneration mode in a compression ignition diesel engine operating at cold conditions

Galindo

Dolz

Monsalve‐Serrano

et al. 2021

International Journal of Engine Research

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Internal combustion engines working at cold conditions lead to the production of excessive pollutant emissions levels. The use of the exhaust gas recirculation could be necessary to reduce the nitrogen oxides emissions, even at these conditions. This paper evaluates the impact of using the high-pressure exhaust gas recirculation strategy while the diesel particulate filter is under active regeneration mode on a Euro 6 turbocharged diesel engine running at low ambient temperature (−7°C). This strategy is evaluated under 40 h of operation, 20 of them using the two systems in combination. The results show that the activation of the high-pressure exhaust gas recirculation during the particulate filter regeneration process leads to a 50% nitrogen oxides emissions reduction with respect to a reference case without exhaust gas recirculation. Moreover, the modification of some engine parameters compared to the base calibration, as the exhaust gas recirculation rate, the main fuel injection timing and the post injection quantity, allows to optimize this strategy by reducing the carbon monoxide emissions up to 60%. Regarding the hydrocarbons emissions and fuel consumption, a small advantage could be observed using this strategy. However, the activation of the high-pressure exhaust gas recirculation at low temperatures can produce fouling deposits and condensation on the engine components (valve, cooler, intake manifold, etc.) and can contribute to reach saturation conditions on the particulate filter. For these reasons, the regeneration efficiency is followed during the experiments through the filter status, concluding that the use of low high-pressure exhaust gas recirculation rates in combination with the regeneration mode also allows to clean the soot particles of the particulate filter. These soot depositions are visualized and presented at the end of this work with a brief analysis of the soot characteristics and a quantitative estimation of the total soot volume produced during the experimental campaign.

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Development of an experimental test bench and a psychrometric model for assessing condensation on a low-pressure exhaust gas recirculation cooler

Cited by 17 publications

References 42 publications

Analysis of the Driving Altitude and Ambient Temperature Impact on the Conversion Efficiency of Oxidation Catalysts

Analysis of the Driving Altitude and Ambient Temperature Impact on the Conversion Efficiency of Oxidation Catalysts

Environmental control of the technical condition of electromagnetic nozzles of internal combustion engines

Impacts of the exhaust gas recirculation (EGR) combined with the regeneration mode in a compression ignition diesel engine operating at cold conditions

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