The Algorithm of Calculation of the Four-Stroke Turbocharged Diesel Engine Cycle Using the Compressor Efficiency Map

2022 ◽  
pp. 619-626
Author(s):  
A. Yu. Abalyaev ◽  
A. A. Gavrilov ◽  
A. N. Gots
Keyword(s):  
Diesel Engine ◽  
Turbocharged Diesel Engine ◽  
Efficiency Map ◽  
Compressor Efficiency ◽  
Engine Cycle

scholarly journals Turbocompound Power Unit Modelling for a Supercapacitor-Based Series Hybrid Vehicle Application

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 447
Author(s):  
Matteo Repetto ◽  
Massimiliano Passalacqua ◽  
Luis Vaccaro ◽  
Mario Marchesoni ◽  
Alessandro Pini Prato
Keyword(s):  
Diesel Engine ◽  
Power Unit ◽  
Fuel Economy ◽  
Hybrid Vehicle ◽  
Efficiency Improvement ◽  
Technical Literature ◽  
Turbocharged Diesel Engine ◽  
Conventional Vehicle ◽  
Efficiency Increase ◽  
Efficiency Map

In this paper, starting from the measurements available for a 2000 cm3 turbocharged diesel engine, an analytical model of the turbocharger is proposed and validated. The model is then used to extrapolate the efficiency of a power unit with a diesel engine combined with a turbocompound system. The obtained efficiency map is used to evaluate the fuel economy of a supercapacitor-based series hybrid vehicle equipped with the turbocompound power unit. The turbocompound model, in accordance with the studies available in the technical literature, shows that the advantages (in terms of efficiency increase) are significant at high loads. For this reason, turbocompound introduction allows a significant efficiency improvement in a series hybrid vehicle, where the engine always works at high-load. The fuel economy of the proposed vehicle is compared with other hybrid and conventional vehicle configurations.

Stabilizing Excessive EGR With an Oxidation Catalyst on a Modern Diesel Engine

2002 ◽  
Author(s):  
Ming Zheng ◽  
David K. Irick ◽  
Jeffrey Hodgson
Keyword(s):  
Diesel Engine ◽  
Oxidation Catalyst ◽  
Stable Operation ◽  
Exhaust Gas ◽  
Oxides Of Nitrogen ◽  
Engine Operation ◽  
Turbocharged Diesel Engine ◽  
New Approach ◽  
Cyclic Variations ◽  
Gas Recirculation

For diesel engines (CIDI) the excessive use of exhaust gas recirculation (EGR) can reduce in-cylinder oxides of nitrogen (NOx) generation dramatically, but engine operation can also approach zones with high instabilities, usually accompanied with high cycle-to-cycle variations and deteriorated emissions of total hydrocarbon (THC), carbon monoxide (CO), and soot. A new approach has been proposed and tested to eliminate the influences of recycled combustibles on such instabilities, by applying an oxidation catalyst in the high-pressure EGR loop of a turbocharged diesel engine. The testing was directed to identifying the thresholds of stable operation at high rates of EGR without causing cycle-to-cycle variations associated with untreated recycled combustibles. The elimination of recycled combustibles using the oxidation catalyst showed significant influences on stabilizing the cyclic variations, so that the EGR applicable limits are effectively extended. The attainability of low NOx emissions with the catalytically oxidized EGR is also evaluated.

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