Browsing by Author "Vojtíšek Michal"
Now showing 1 - 20 of 21
Results Per Page
Sort Options
- Item
- ItemAssessment of on-road emissions of nitrogen oxides from heavy vehicles during regular operation(2019-01-01) Vojtíšek Michal; Jindra Petr; Macoun David; Pechout Martin
- ItemCase and components for a miniature specialty small motorcycle exhaust emissions analyzer(2016-01-01) Pechout Martin; Dittrich Luboš; Vojtíšek Michal
- ItemComponents for a miniature portable on-board emissions monitoring system(2016-01-01) Vojtíšek Michal; Dittrich Luboš; Pechout Martin
- ItemEffect of Alcohol Blending on Real Driving Emissions of Particulate Matter from Ordinary Gasoline Automobile Engines: a Comparison of Ethanol, N-butanol And Isobutanol(Instytut Nafty i Gazu - Panstwowy Instytut Badawczy, 2015-01-01) Pechout Martin; Mazač Martin; Dittrich Luboš; Vojtíšek Michal
- ItemEffects of n-Butanol and Isobutanol on Particulate Matter Emissions from a Euro 6 Direct-injection Spark Ignition Engine During Laboratory and on-Road Tests(Society of Automotive Engineers, 2015-01-01) Vojtíšek Michal; Beránek Vít; Klír Vojtěch; Štolcpartová Jitka; Pechout Martin
- ItemExhaust emissions from a CKD 754 diesel-electric locomotive during real-world operation(2016-01-01) Vojtíšek Michal; Pechout Martin
- ItemExperimental Investigation of Fuel Injection and Spark Timing for the Combustion of n-Butanol and iso-Butanol and Their Blends with Gasoline in a Two-Cylinder SI Engine(Society of Automotive Engineers, 2017-01-01) Pechout Martin; Czerwinski Jan; Güdel Martin; Vojtíšek Michal
- ItemFTIR analysis of surface functionalities on particulate matter produced by off-road diesel engines operating on diesel and biofuel(SPRINGER HEIDELBERG, 2015-01-01) Popovicheva Olga; Kireeva Elena D.; Shonija Natalia K.; Vojtíšek Michal; Schwarz Jaroslav
- ItemInternal Combustion Engines as the Main Source of Ultrafine Particles in Residential Neighborhoods: Field Measurements in the Czech Republic(MDPI AG, 2015-01-01) Štolcpartová Jitka; Pechout Martin; Dittrich Luboš; Mazač Martin; Fenkl Michael; Vrbová Kristýna; Ondráček Jakub; Vojtíšek Michal
- ItemLocating Urban Hot-spots with Mobile On-line Size-resolved Nanoparticle Measurement(Tanger Ltd., 2015-01-01) Vojtíšek Michal; Pechout Martin; Dittrich Luboš; Mazač Martin; Štolcpartová Jitka
- ItemMethod of and device for enhancing operation of two-fuel system of compression ignition engine(2015-01-01) Vojtíšek Michal
- Item
- ItemA miniature Portable Emissions Measurement System (PEMS) for real-driving monitoring of motorcycles(Copernicus, 2020-01-01) Vojtíšek Michal; Vojtíšek Michal; Zardini Alessandro; Pechout Martin; Dittrich Luboš; Forni Fausto; Montigny Francois; Carriero Massimo; Giechaskiel Barouch; Martini Giorgio
- ItemN-butanol and isobutanol as alternatives to gasoline: Comparison of port fuel injector characteristics(2016-01-01) Fenkl Michael; Pechout Martin; Vojtíšek Michal
- ItemOn-road detection of trucks with high NOx emissions from a patrol vehicle with on-board FTIR analyzer(Elsevier, 2020-01-01) Vojtíšek Michal; Vojtíšek Michal; Arul Raj Alden Fred; Macoun David; Jindra Petr; Pechout Martin; Pechout Martin
- ItemOn-road measurement of NH3 emissions from gasoline and diesel passenger cars during real world driving conditions(Elsevier, 2017-01-01) Suarez-Bertoa Ricardo; Mendoza-Villafuerte Pablo; Riccobono Francesco; Vojtíšek Michal; Pechout Martin; Perujo Adolfo; Astorga CovadongaNH3is a precursor of PM2.5which deteriorates urban air quality, affects human health and impacts theglobal radiation budget. Since vehicles are important sources of NH3in urban areas, we have satisfac-torily studied the possibility of measuring NH3emissions from gasoline and SCR-equipped diesel light-duty vehicles during real driving on-road operation using a portable FTIR. The performance of theportable FTIR resulted to be comparable to that of a laboratory-based FTIR during a series of experimentsperformed in the Vehicle Emission Laboratory (VELA) using the World-harmonized Light-duty Test Cycle(WLTC). Higher on-road NH3emission factors were obtained for the gasoline vehicle than for the diesel.High NOx emissions were measured from the diesel vehicle, indicating a low efficiency of the DeNOxsystem, SCR. On-road NH3emission factors were ~2 times lower than during the laboratory tests at 23 Cfor both vehiclesNH3emissions were not observed for the diesel vehicle during cold start operation.However, NH3cold start emissions from the gasoline vehicle were up to 2 orders of magnitude higherthan during the entire road trips, ranging from 45 to 134 mg km 1. Cold start emissions are of paramountimportance as they commonly take place in urban areas. Hence, future urban reductions in PM2.5mightneed to take into consideration the introduction of NH3emissions limits for passenger cars
- ItemPolycyclic aromatic hydrocarbons (PAH) and their genotoxicity in exhaust emissions from a diesel engine during extended low-load operation on diesel and biodiesel fuels(PERGAMON-ELSEVIER SCIENCE LTD, 2015-01-01) Vojtíšek Michal; Pechout Martin; Dittrich Luboš; Kotek Martin; Schwarz Jaroslav; Vodička Petr; Milcová Alena; Rossnerová Andrea; Ambrož Antonín
- ItemReal Driving Emissions of Two Older Ordinary Cars Operated on High-Concentration Blends of N-Butanol and ISO-Butanol with Gasoline(Society of Automotive Engineers, 2015-01-01) Pechout Martin; Dittrich Aleš; Mazač Martin; Vojtíšek Michal
- ItemReal-World Exhaust Emissions of Diesel Locomotives and Motorized Railcars during Scheduled Passenger Train Runs on Czech Railroads(MDPI, 2020-01-01) Vojtíšek Michal; Vojtíšek Michal; Jirků Jonáš; Pechout MartinThe paper summarizes exhaust emissions measurements on two diesel-electric locomotives and one diesel-hydraulic railcar, each tested for several days during scheduled passenger service. While real driving emissions of buses decrease with fleet turnaround and have been assessed by many studies, there are virtually no realistic emissions data on diesel rail vehicles, many of which are decades old. The engines were fitted with low-power portable online monitoring instruments, including a portable Fourier Transform Infra Red (FTIR) spectrometer, online particle measurement, and in two cases with proportional particle sampling systems, all installed in engine compartments. Due to space constraints and overhead electric traction lines, exhaust flow was computed from engine operating data. Real-world operation was characterized by relatively fast power level transitions during accelerations and interleaved periods of high load and idle, and varied considerably among service type and routes. Spikes in PM emissions during accelerations and storage of PM in the exhaust were observed. Despite all engines approaching the end of their life, the emissions per passenger-km were very low compared to automobiles. Tests were done at very low costs with no disruption of the train service, yielded realistic data, and are also applicable to diesel-hydraulic units, which cannot be tested at standstill.