Investigations of unleaded fuels for OTTO-engines with different octane number improving components with respect to knocking, fuel consumption and exhaust emissions

In this paper, we use car-following model to explore the influences of the vehicle’s fuel consumption and exhaust emissions on each commuter’s trip cost without late arrival on one open road. Our results illustrate that considering the vehicle’s fuel cost and emission cost only enhances each commuter’s trip cost and the system’s total cost, but has no prominent impacts on his optimal time headway at the origin of each open road under the minimum total cost.

Download Full-text

Numerical and Experimental Study on the Impact of Mild Cold EGR on Exhaust Emissions in a Biodiesel Fueled Diesel Engine

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.4051951 ◽

2021 ◽

Author(s):

Alex Oliveira ◽

Junfeng Yang ◽

Jose Sodre

Keyword(s):

Diesel Engine ◽

Fuel Consumption ◽

Exhaust Emissions ◽

Pollutant Emissions ◽

Cylinder Pressure ◽

Nox Formation ◽

Ratio Distribution ◽

Engine Model ◽

Gas Recirculation ◽

The Impact

Abstract This work evaluated the effect of cooled exhaust gas recirculation (EGR) on fuel consumption and pollutant emissions from a diesel engine fueled with B8 (a blend of biodiesel and Diesel 8:92%% by volume), experimentally and numerically. Experiments were carried out on a Diesel power generator with varying loads from 5 kW to 35 kW and 10% of cold EGR ratio. Exhaust emissions (e.g. THC, NOX, CO etc.) were measured and evaluated. The results showed mild EGR and low biodiesel content have minor impact of engine specific fuel consumption, fuel conversion efficiency and in-cylinder pressure. Meanwhile, the combination of EGR and biodiesel reduced THC and NOX up to 52% and 59%, which shows promising effect on overcoming the PM-NOX trade-off from diesel engine. A 3D CFD engine model incorporated with detailed biodiesel combustion kinetics and NOx formation kinetics was validated against measured in-cylinder pressure, temperature and engine-out NO emission from diesel engine. This valid model was then employed to investigate the in-cylinder temperature and equivalence ratio distribution that predominate NOx formation. The results showed that the reduction of NOx emission by EGR and biodiesel is obtained by a little reduction of the local in-cylinder temperature and, mainly, by creating comparatively rich combusting mixture.

Download Full-text

Future Engine Designs for Minimum Fuel Consumption and Exhaust Emissions

10.4271/811385 ◽

1981 ◽

Author(s):

P. L. Dartnell

Keyword(s):

Fuel Consumption ◽

Exhaust Emissions

Download Full-text

Control of Exhaust Emissions Using Piston Coating on Two-StrokeSI Engines with Gasoline Blends

Journal of Engineering Sciences ◽

10.21272/jes.2021.8(1).h3 ◽

2021 ◽

Vol 8 (1) ◽

pp. H16-H20

Author(s):

A.V.N.S. Kiran ◽

B. Ramanjaneyulu ◽

M. Lokanath M. ◽

S. Nagendra ◽

G.E. Balachander

Keyword(s):

Fuel Consumption ◽

Thermal Efficiency ◽

Internal Combustion Engines ◽

Fossil Fuels ◽

Engine Performance ◽

Exhaust Emissions ◽

Specific Fuel Consumption ◽

Thermal Barrier ◽

Piston Crown ◽

Barrier Coating

An increase in fuel utilization to internal combustion engines, variation in gasoline price, reduction of the fossil fuels and natural resources, needs less carbon content in fuel to find an alternative fuel. This paper presents a comparative study of various gasoline blends in a single-cylinder two-stroke SI engine. The present experimental investigation with gasoline blends of butanol and propanol and magnesium partially stabilized zirconium (Mg-PSZ) as thermal barrier coating on piston crown of 100 µm. The samples of gasoline blends were blended with petrol in 1:4 ratios: 20 % of butanol and 80 % of gasoline; 20 % of propanol and 80 % of gasoline. In this work, the following engine characteristics of brake thermal efficiency (BTH), specific fuel consumption (SFC), HC, and CO emissions were measured for both coated and non-coated pistons. Experiments have shown that the thermal efficiency is increased by 2.2 % at P20. The specific fuel consumption is minimized by 2.2 % at P20. Exhaust emissions are minimized by 2.0 % of HC and 2.4 % of CO at B20. The results strongly indicate that the combination of thermal barrier coatings and gasoline blends can improve engine performance and reduce exhaust emissions.

Download Full-text

Analysis of exhaust emission measurements in rural conditions from heavy-duty vehicle

Combustion Engines ◽

10.19206/ce-2020-309 ◽

2020 ◽

Vol 182 (3) ◽

pp. 54-58

Author(s):

Andrzej Ziółkowski ◽

Paweł Fuć ◽

Piotr Lijewski ◽

Łukasz Rymaniak ◽

Paweł Daszkiewicz ◽

...

Keyword(s):

Fuel Consumption ◽

Road Transport ◽

Exhaust Emissions ◽

Operating Conditions ◽

Transport Sector ◽

Exhaust Emission ◽

Heavy Vehicles ◽

Heavy Duty Vehicle ◽

Emission Norm ◽

Test Route

Road transport holds for the largest share in the freight transport sector in Europe. This work is carried out by heavy vehicles of various types. It is assumed that, in principle, transport should take place on the main road connections, such as motorways or national roads. Their share in the polish road infrastructure is not dominant. Rural and communal roads roads are the most prevalent. This fact formed the basis of the exhaust emissions and fuel consumption tests of heavy vehicles in real operating conditions. A set of vehicles (truck tractor with a semi-trailer) meeting the Euro V emission norm, transporting a load of 24,800 kg, was selected for the tests. The research was carried out on an non-urban route, the test route length was 22 km. A mobile Semtech DS instrument was used, which was used to measure the exhaust emissions. Based on the obtained results, the emission characteristics were determined in relation to the operating parameters of the vehicles drive system. Road emission, specific emission and fuel consumption values were also calculated.

Download Full-text