Tag Archives: emission

1162–1169 B. Peterka,, M. Pexa, J. Čedík, D. Mader and M. Kotek
Comparison of exhaust emissions and fuel consumption of small combustion engine of portable generator operated on petrol and biobutanol
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Comparison of exhaust emissions and fuel consumption of small combustion engine of portable generator operated on petrol and biobutanol

B. Peterka¹,*, M. Pexa¹, J. Čedík¹, D. Mader¹ and M. Kotek²

¹ Czech University of Life Sciences Prague, Faculty of Engineering, Department for Quality and Dependability of Machines, Kamycka 129, CZ165 21 Prague 6, Czech Republic
² Czech University of Life Sciences Prague, Faculty of Engineering, Department of Vehicles and Ground Transport, Kamycka 129, CZ165 21 Prague 6, Czech Republic
*Correspondence: peterka@oikt.czu.cz

Abstract:

The paper is focused on the comparison of exhaust emissions and fuel consumption of small internal combustion engines operated on petrol and biobutanol. In case of this research, small engines are represented by combustion engine of portable power generator with nominal power of 4.8 kW equipped with carburettor for fuel mixture preparation. Exhaust emissions and fuel consumption were measured while gradual loading of the combustion engine. BrainBee emission analyser, Bruker FTIR spectrometer and EEPS particle analyser was used for the measurement. The mass fuel consumption was monitored using laboratory scale Vibra. The initial hypothesis expected that exhaust emissions and fuel consumption will be higher in case of use of nonstandard fuels. From the viewpoint of particles count can be stated, that their productions are at very low level for both kinds of used fuels. Production of carbon monoxide and hydrocarbons is higher than in case of usual automobile engine due to simple engine control system and absence of additional emission control device (catalytic converter). The fuel consumption increased while using n-butanol as a result of its lower calorific value.

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1332-1341 M. Kotek, P. Jindra and J. Mařík
Speed limits and their impact on emissions production and fuel consumption
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Speed limits and their impact on emissions production and fuel consumption

M. Kotek, P. Jindra* and J. Mařík

Czech University of Life Science Prague, Faculty of Engineering, Department of Vehicles and Ground Transport, Kamýcká 129, CZ16521 Prague, Czech republic
*Correspondence: jindrap@tf.czu.cz

Abstract:

The article deals with emissions and fuel consumption of road vehicles in real traffic conditions. The aim of this study was to prove or disprove correctness of the decision of Prague city government to change the speed limits from 70 km h-1 to 50 km h-1 on the parts of one main road leading to/from Prague. For measurements in real traffic conditions was used 2 typical Czech cars Skoda with manual transmission (Fabia 1.2 MPI with petrol engine and Octavia 2.0 TDI with diesel engine). Measurements were performed on both of directions on defined road segment.

At speed 50 km h-1 the measurement was repeated 5 times at 3rd and 5 times on 4th gear. Similarly at speed 70 km h-1 the measurement was repeated 5 times at the 4th and 5th gear. The aim was to operate the vehicle in the normal engine loads.
The results demonstrate the fundamental assumption that at the higher allowed vehicle speed the engine is more loaded and therefore produces a higher amount of emissions, but according to a higher vehicle speed the emissions are produced on the defined segment for the shorter time. A similar trend is evident even in fuel consumption. The results also indicate the depending on the power reserve of specific vehicle. When the vehicle is more powerful, higher permitted speed is preferable.

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577-584 T. Kotek,, M. Kotek, P. Jindra and M. Pexa
Determination of the optimal injection time for adaptation SI engine on E85 fuel using self-designed auxiliary control unit
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Determination of the optimal injection time for adaptation SI engine on E85 fuel using self-designed auxiliary control unit

T. Kotek¹,*, M. Kotek², P. Jindra² and M. Pexa¹

¹Czech University of Life Science Prague, Faculty of Engineering, Department for Quality and Dependability of Machines, Kamýcká 129, CZ16521 Prague, Czech republic; *Correspondence: kotek@oikt.czu.cz
²Czech University of Life Science Prague, Faculty of Engineering, Department of Vehicles and Ground Transport, Kamýcká 129, CZ16521 Prague, Czech republic

Abstract:

Article deals with problems of the operation of spark ignition combustion engine on high-percentage of blend bioethanol. The aim of the experiment was to find the optimal value of injection time of the engine injection valves with respect to the adaptive ability of the original engine control unit (ECU) when using a special auxiliary control unit (ACU) was adjusted injection time. Special dynamic driving cycle has been designed to assess the effects of prolonged injection time on the adaptive abilities of the ECU that stemmed from a real recording vehicle’s rides with the same engine as was used in conducted experiments. The results proved that by changing the extension of the period of injection occurs a gradual adaptation of the original ECU, but this adaptation is gradual and underway predominantly in modes functional closed-loop control, thus in modes of low to medium of loads. Results of the experiment provide determination of the efficient frontier of the percentage extension injection time with regard to adaptive abilities of original ECU.

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577-584 T. Kotek,, M. Kotek, P. Jindra and M. Pexa
Determination of the optimal injection time for adaptation SI engine on E85 fuel using self-designed auxiliary control unit
Abstract |
Full text PDF (241 kB)

Determination of the optimal injection time for adaptation SI engine on E85 fuel using self-designed auxiliary control unit

T. Kotek¹,*, M. Kotek², P. Jindra² and M. Pexa¹

¹Czech University of Life Science Prague, Faculty of Engineering, Department for Quality and Dependability of Machines, Kamýcká 129, CZ16521 Prague, Czech republic; *Correspondence: kotek@oikt.czu.cz
²Czech University of Life Science Prague, Faculty of Engineering, Department of Vehicles and Ground Transport, Kamýcká 129, CZ16521 Prague, Czech republic

Abstract:

Article deals with problems of the operation of spark ignition combustion engine on high-percentage of blend bioethanol. The aim of the experiment was to find the optimal value of injection time of the engine injection valves with respect to the adaptive ability of the original engine control unit (ECU) when using a special auxiliary control unit (ACU) was adjusted injection time. Special dynamic driving cycle has been designed to assess the effects of prolonged injection time on the adaptive abilities of the ECU that stemmed from a real recording vehicle’s rides with the same engine as was used in conducted experiments. The results proved that by changing the extension of the period of injection occurs a gradual adaptation of the original ECU, but this adaptation is gradual and underway predominantly in modes functional closed-loop control, thus in modes of low to medium of loads. Results of the experiment provide determination of the efficient frontier of the percentage extension injection time with regard to adaptive abilities of original ECU.

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