scholarly journals Error Analysis of the Normative Calculation Method of the Exhaust Emissions and Fuel Consumption in the Vehicles Fueled with Gaseous Fuels

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1916
Author(s):  
Paulina Grzelak ◽  
Sławomir Taubert
Keyword(s):  
Fuel Consumption ◽  
Exhaust System ◽  
Exhaust Emissions ◽  
Pollutant Emissions ◽  
Separate Analysis ◽  
Liquefied Petroleum Gas ◽  
Normative Documents ◽  
Gaseous Fuels ◽  
Driving Cycles ◽  
Type Approval

The methodologies for calculating exhaust emissions and fuel consumption, which are given in the normative documents, do not take into account the fact that vehicles equipped with liquefied petroleum gas (LPG) or compressed natural gas (CNG) systems are fueled with petrol after a cold start. When calculating exhaust emissions and fuel consumption of LPG or CNG-powered vehicles, it is assumed that they result from the combustion of gaseous fuel only. This simplification leads to an incorrect determination of the emissions and fuel consumption values, as the formulas for calculating these values differ depending on the fuel type. This article presents the results of tests aimed at checking how that factor affects the value of emissions and fuel consumption calculated in the driving cycles used in the type-approval tests. In order to estimate the error resulting from this simplification, the tests of exhaust emissions and fuel consumption of a vehicle equipped with an LPG system were carried out. The tests were carried out on a chassis dynamometer in the worldwide harmonized light vehicles test cycle (WLTC) used in the type approval tests. In the tested vehicle, the CO, total hydrocarbons (THC), NOx and CO2 emissions calculated with the normative method were approx. 7% lower than the values calculated with the corrected method. For this reason, there is a need to develop a measurement method that allows for a separate analysis of the phase in which the vehicle is fueled with gasoline. This will allow the elimination of errors in the current normative method of calculating pollutant emissions from the exhaust system and fuel consumption of vehicles fueled with gaseous fuels.

scholarly journals Performance, Emissions, and Efficiency of Biodiesel versus Hydrotreated Vegetable Oils (HVO), Considering Different Driving Cycles Sensitivity Analysis (NEDC and WLTP)

Fuels ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 448-470
Author(s):  
Luis Serrano ◽  
Barbara Santana ◽  
Nuno Pires ◽  
Cristina Correia
Keyword(s):  
Sensitivity Analysis ◽  
Fuel Consumption ◽  
Vegetable Oils ◽  
Fossil Fuels ◽  
Engine Performance ◽  
Cost Effective ◽  
Pollutant Emissions ◽  
Driving Cycles ◽  
Type Approval ◽  
Cost Effective Approach

The use of biofuels in vehicles becomes more advantageous than the consumption of fossil fuels, mainly because it uses renewable sources of energy. Recently there are some concerns about biodiesel sources, and hydrotreated vegetable oils (HVO) appear as a possible advanced solution. To understand the effect that the implementation of the new and old European type-approval test cycles (NEDC e WLTP) has on the results of these fuels considering pollutant emissions and fuel consumption results, a EURO V vehicle was subject to these cycles and also to engine performance evaluation tests. For this analysis, the fuels considered were: B0 (pure diesel), B7 (7% of biodiesel), B15 (15% of biodiesel), B100 (pure biodiesel), and HVO15 (15% of HVO). The findings lead to the conclusion that completely replacing fossil fuels with biofuels is not the most cost-effective approach. No significant differences were observed considering the two homologation cycles, the oldest (NEDC) and the actual (WLTP) and the use of HVO also does not present any relevant differences concerning the fuel consumption differences to B0 (+0.58% NEDC and +0.05%WLTP), comparing well with biodiesel behavior (−1.74% NEDC and −0.69%WLTP for B7 and +1.48% NEDC and 1.89% WLTP for B15). Considering the power of the engine obtained with the fuels, the differences are almost negligible, revealing variations smaller than 2% for B7, B15, and HVO15.

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

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.

Evaluation of hot water storage strategy in internal combustion engine on different driving cycles using numerical simulations

2017 ◽  
Vol 232 (8) ◽  
pp. 1019-1035 ◽  
Author(s):  
Hanna Sara ◽  
David Chalet ◽  
Mickaël Cormerais ◽  
Jean-François Hetet
Keyword(s):  
Ambient Temperature ◽  
Fuel Consumption ◽  
Thermal Management ◽  
Negative Impact ◽  
Combustion Engine ◽  
Driving Cycle ◽  
Hot Water ◽  
Pollutant Emissions ◽  
Engine Model ◽  
Driving Cycles

Since the main interest worldwide of green environment companies is to reduce pollutant emissions, the automotive industry is aiming to improve engine efficiency in order to reduce fuel consumption. Recently, studies have been shifted from upgrading the engine to the auxiliary systems attached to it. Thermal management is one of the successful fields that has shown promise in minimizing fuel consumption and reducing pollutant emissions. Throughout this work, a four-cylinder turbocharged diesel engine model was developed on GT-Power. Also, a thermal code has been developed in parallel on GT-Suite, in which the different parts of the coolant and lubricant circuits were modeled and calibrated to have the best agreement with the temperature profile of the two fluids in the system. Once the model was verified, hot coolant storage, a thermal management strategy, was applied to the system to assess the fuel consumption gain. The storage tank was located downstream the thermostat and upstream the radiator with three valves to control the coolant flow. The place was chosen to avoid negative impact on the cold start-up of the engine when the tank is at the ambient temperature. This strategy was applied on different driving cycles such as the NEDC, WLTC, CADC (urban and highway), and an in-house developed driving cycle. The ambient temperature was varied between −7°C to represent the coldest winter and 20°C. The results of this study summarize the ability of the hot coolant storage strategy in reducing the fuel consumption, and show the best driving cycle that needs to be applied on along with the influence of the different ambient temperatures.

The Analysis of Fuel Consumption and Exhaust Emissions From Forklifts Fueled by Diesel Fuel and Liquefied Petroleum Gas (LPG) Obtained Under Real Driving Conditions

2017 ◽  
Author(s):  
Pawel Fuc ◽  
Piotr Lijewski ◽  
Przemyslaw Kurczewski ◽  
Andrzej Ziolkowski ◽  
Michal Dobrzynski
Keyword(s):  
Energy Consumption ◽  
Fuel Consumption ◽  
Test Procedure ◽  
Exhaust Emissions ◽  
Spark Ignition Engine ◽  
Emission Measurement ◽  
Liquefied Petroleum Gas ◽  
Load Transport ◽  
Driving Conditions ◽  
Identical Type

The paper presents an analysis of gaseous exhaust emissions and fuel consumption obtained from two forklifts based on the measurements performed under actual driving conditions. The first of the investigated objects was fitted with a diesel engine and the second with a spark ignition engine fueled with LPG. In order to carry out the research, the authors developed a proprietary methodology because the VDI 2198 test procedure (developed by VDI - Association of German Engineers) for the determination of forklift energy consumption, did not fully reflect the actual conditions of operation of these vehicles. The VDI procedure only determines the energy consumption according to predetermined sequences (collecting load, load transport, load-dropping) performed only in indoor areas. The authors developed a test route composed of similar sequences i.e. collecting load, load transport, load-dropping and driving without a load. The measurements were carried out in a warehouse and outdoors, which better reflected the actual forklift driving conditions. During the trials, the exhaust emissions were measured (Semtech - Portable Emission Measurement System) along with the driving parameters such as speed, acceleration and distance covered. Based on the obtained parameters, on-road exhaust emissions and fuel consumption were obtained. The obtained data allowed a comparison of the measurement conditions and the type of fuel used for the forklifts. Both tested vehicles were loaded with identical type of load of the same weight.

Effects of biodiesel on passenger car fuel consumption, regulated and non-regulated pollutant emissions over legislated and real-world driving cycles

Fuel ◽  
2009 ◽  
Vol 88 (9) ◽  
pp. 1608-1617 ◽  
Author(s):  
Georgios Fontaras ◽  
Georgios Karavalakis ◽  
Marina Kousoulidou ◽  
Theodoros Tzamkiozis ◽  
Leonidas Ntziachristos ◽  
...  
Keyword(s):  
Fuel Consumption ◽  
Real World ◽  
Pollutant Emissions ◽  
Passenger Car ◽  
Driving Cycles

Calibration of a Knock Prediction Model for the Combustion of Gasoline-Natural Gas Mixtures

2009 ◽  
Author(s):  
Emiliano Pipitone ◽  
Stefano Beccari
Keyword(s):  
Natural Gas ◽  
Prediction Model ◽  
Performance Optimization ◽  
Maximum Error ◽  
Pollutant Emissions ◽  
Liquefied Petroleum Gas ◽  
Gaseous Fuels ◽  
Engine Efficiency ◽  
Thermodynamic Simulations ◽  
Fuel Consumption And Emissions

Gaseous fuels, such as Liquefied Petroleum Gas (LPG) and Natural Gas (NG), thank to their good mixing capabilities, allow complete and cleaner combustion than normal gasoline, resulting in lower pollutant emissions and particulate matter. Moreover natural gas, which is mainly constituted by methane, whose molecule has the highest hydrogen/carbon ratio, leads also to lower ozone depleting emissions. The authors in a previous work (1) experienced the simultaneous combustion of gasoline and natural gas in a bi-fuel S.I. engine, exploiting so the high knock resistance of methane to run the engine with an ‘overall stoichiometric’ mixture (thus lowering fuel consumption and emissions) and better spark advance (which increases engine efficiency) even at full load: the results showed high improvements in engine efficiency without noticeable power losses with respect to the pure gasoline operation. With the aim to provide a knock prevision submodel to be used in engine thermodynamic simulations for a knock-safe performance optimization of engines fuelled by NG/gasoline mixtures, the authors recorded the in-cylinder pressure cycles under light knocking condition for different engine speed, loads and natural gas fraction (i.e. the ratio between the injected natural gas mass and the total fuel mass), and used the gas pressure data to calibrate a classical knock-prediction model: as shown, the results obtained allow to predict the onset of knocking in a S.I. engine fuelled with a gasoline-natural gas mixture with any proportion between the two fuels, with a maximum error of 5 CAD.

Influence of ambient temperature on diesel engine raw pollutants and fuel consumption in different driving cycles

2018 ◽  
Vol 20 (8-9) ◽  
pp. 877-888 ◽  
Author(s):  
José Manuel Luján ◽  
Héctor Climent ◽  
Santiago Ruiz ◽  
Ausias Moratal
Keyword(s):  
Carbon Monoxide ◽  
Diesel Engine ◽  
Ambient Temperature ◽  
Fuel Consumption ◽  
Thermal Efficiency ◽  
Point Of View ◽  
Pollutant Emissions ◽  
Ambient Temperatures ◽  
Driving Cycles ◽  
Light Duty

The effect of low ambient temperature on diesel raw pollutant emissions is analysed in two different driving cycles: NEDC and WLTC. The study is focused on hydrocarbons, carbon monoxide, nitrogen oxides and fuel consumption. Tests are conducted at cold start in a HSDI light-duty diesel engine with two levels of ambient temperature: 20 °C and −7 °C. Results showed a general detriment of pollutant emissions and break thermal efficiency at low ambient temperatures. NOx is increased around 250% in both cycles when running at low temperatures. Effect on hydrocarbons is more noticeable in the NEDC, where it rises in 270%, compared with the 150% of increase in the WLTC. In the case of carbon monoxide, uncorrelated tendencies are observed between both driving cycles. Concerning the NEDC, carbon monoxide emissions increase up to 125%, while at the WLTC, they are reduced up to 20%. Finally, from the point of view of the thermal efficiency, a reduction of nearly 10% in the NEDC is observed. However, no fuel penalty is spotted regarding the WLTC.

scholarly journals CHARACTERISTICS OF SELECTED DRIVING CYCLES USED FOR EXHAUST EMISSIONS MEASUREMENT FROM PASSENGER CAR ENGINES

2021 ◽  
Vol 1 (50) ◽  
pp. 67-80
Author(s):  
JAWORSKI A ◽  
◽  
JAREMCIO M ◽  
LEJDA K ◽  
MĄDZIEL M ◽  
...  
Keyword(s):  
Automotive Industry ◽  
Test Procedure ◽  
Exhaust Emissions ◽  
Testing Procedure ◽  
Driving Cycle ◽  
Pollutant Emissions ◽  
Exhaust Gases ◽  
Driving Cycles ◽  
Test Parameters ◽  
Vehicle Test

The manufacturing process for new passenger vehicles is based not only on their design and manufacture, but also on validation and testing, especially in the area of exhaust emissions. The car manufacturer is obliged to approve the type of each new model in accordance with the regulations. The regulation associated with the relevant directive includes a number of requirements, including the emissions of pollutants in the exhaust gas, which are imposed on newly manufactured vehicles. Along with the development of the automotive industry, more and more attention has been paid to the pollution that forms in the internal combustion engines of vehicles. The European Union has introduced standards known as “EURO” to define emission limits for the main pollutants in exhaust gases. The tests are carried out for all passenger cars in the same way: on a dynamometer, in a climatic chamber (with the possibility of temperature adjustment) and in accordance with a certain driving cycle. Road tests are designed to check fuel consumption and exhaust emissions. In September 2017, a new procedure was introduced called the World Harmonized Light Vehicle Test Procedure (WLTP), which includes several driving cycles called WLTC. The introduction of the new test was driven by the very dynamic development in the automotive industry of hybrid and electric vehicles. The previous NEDC test did not take into account several important parameters such as motor power or drive type. Due to the different specifics of road traffic in the United States, their own road tests were developed, in contrast to European ones. Tests are conducted in accordance with FTP-75 (Federal Testing Procedure). The test parameters take into account driving stability and engine operating conditions, on which the values of pollutant emissions in the exhaust gases depend. Due to the difference in laboratory driving cycles, according to traffic conditions, the values of pollutant emissions in the exhaust gases during road tests differ from those provided by the manufacturers. The article compares the characteristic test parameters according to WLTC, NEDC, American FTP-75 cycles (with additions SC03 and US06) and own road driving cycle in the Rzeszow region. Based on the analysis carried out, it was established that laboratory tests will never 100% reflect those driving conditions and driving on the road. However, the WLTC test has the advantage of being more realistic. Its high average ride speeds, longer stops, long distance traveled and higher top speed are more realistic than the NEDC test. KEY WORDS: VEHICLE TESTING, EFFECTIVE Emissions, WORLD HARMONIZED PASSENGER VEHICLE TEST PROCEDURE, NEW EUROPEAN DRIVING CYCLE, FEDERAL TESTING PROCEDURE.

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