Tag Archives: E85

981–998 M. Gailis, and V. Pirs
Experimental analysis of combustion process in SI Engine using ethanol and ethanol-gasoline blend
Abstract |

Experimental analysis of combustion process in SI Engine using ethanol and ethanol-gasoline blend

M. Gailis¹,²* and V. Pirs²

¹ Riga Technical University, Faculty of Mechanical Engineering, Transport and Aeronautics, Department of Automotive Engineering, Viskalu 36A, LV 1006 Riga, Latvia
² Latvia University of Agriculture, Faculty of Engineering, Motor Vehicle Institute, Liela street 2, LV 3001 Jelgava, Latvia
*Correspondence: maris.gailis@rtu.lv

Abstract:

Effect of fuel composition and ignition timing on combustion parameters of spark ignition (SI) port fuel injection (PFI) engine had been studied experimentally. The engine was fuelled with an ethanol and ethanol-gasoline blend E85. The engine was operated at steady speed at 1,500 min-1 and four load points have been used. Minimal ignition timing advance for maximal brake torque (MBT) at stoichiometric air/ fuel ratio for the tested fuels were found. The fuels were tested at their respective MBT timing and gasoline MBT timing. MBT timing was retarded by 8–11% for ethanol and 5–10% for E85 fuel, comparing to gasoline MBT timing. Indicated mean effective pressure (IMEP) was not affected by ignition timing in tested conditions. Maximal cylinder pressure was increased and flame development phase was extended, when gasoline MBT was used with fuels with high ethanol content at tested conditions.

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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.

Key words:

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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.

Key words:

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