The Experts below are selected from a list of 11499 Experts worldwide ranked by ideXlab platform

Zoran Lulić - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Study on Knock Sources in Spark Ignition Engine with Exhaust Gas Recirculation
    Energy Conversion and Management, 2018
    Co-Authors: Mladen Božić, Ante Vučetić, Momir Sjerić, Darko Kozarac, Zoran Lulić
    Abstract:

    Abstract The presented study aims to experimentally investigate the sources of influence of Exhaust Gas Recirculation on the tendency toward knock in the spark ignition engine. The three main sources of influence of Exhaust Gas Recirculation on the engine tendency towards knock are known. The influence on flame propagation changes the profile of combustion and therefore the end-Gas pressure and temperature profile. The thermal influence changes the thermal properties of the end-Gas mixture and consequently its temperature profile, while the chemical influence changes the kinetic behaviour of the end-Gas mixture. The study is based on the results from experimental setup with spark ignition engine that uses cooled Exhaust Gas Recirculation system and air heater installed into the intake manifold. Experimental tests that employ a new approach were performed, where intake temperature is varied by air heater when engine is operated with different levels of Exhaust Gas Recirculation. In this way the end-Gas temperature and Exhaust Gas Recirculation percentage were varied while the influence on flame propagation was partially compensated by the change of spark timing. The obtained results show that there is no clear chemical influence of the Exhaust Gases on the tendency towards knock as the cases with low and high levels of Exhaust Gas Recirculation are all mixed when the temperature of the end-Gas is set to the same values. This leads to the overall conclusion that the predominant factor in a tendency towards knock is the end-Gas temperature profile.

  • Efficiency improvement of a spark-ignition engine at full load conditions using Exhaust Gas Recirculation and variable geometry turbocharger – Numerical study
    Energy Conversion and Management, 2016
    Co-Authors: Momir Sjerić, Darko Kozarac, Ivan Taritaš, Rudolf Tomić, Mislav Blažić, Zoran Lulić
    Abstract:

    Abstract The numerical analysis of performance of a four cylinder highly boosted spark-ignition engine at full load is described in this paper, with the research focused on introducing high pressure Exhaust Gas Recirculation for control of engine limiting factors such as knock, turbine inlet temperature and cyclic variability. For this analysis the cycle-simulation model which includes modeling of the entire engine flow path, early flame kernel growth, mixture stratification, turbulent combustion, in-cylinder turbulence, knock and cyclic variability was applied. The cylinder sub-models such as ignition, turbulence and combustion were validated by using the experimental results of a naturally aspirated multi cylinder spark-ignition engine. The high load operation, which served as a benchmark value, was obtained by a standard procedure used in calibration of engines, i.e. operation with fuel enrichment and without Exhaust Gas Recirculation. By introducing Exhaust Gas Recirculation and by optimizing other engine operating parameters, the influence of Exhaust Gas Recirculation on engine performance is obtained. The optimum operating parameters, such as spark advance, intake pressure, air to fuel ratio, were found to meet the imposed requirements in terms of fuel consumption, knock occurrence, Exhaust Gas temperature and variation of indicated mean effective pressure. By comparing the results of the base point with the results that used Exhaust Gas Recirculation the improvement in fuel consumption of 8.7%, 11.2% and 1.5% at engine speeds of 2000 rpm, 3500 rpm and 5000 rpm is obtained. Additionally, by using the presented numerical methodology the influence of the specific operating parameter on the overall behavior of the complex charging system was shown.

Jonathan Chauvin - One of the best experts on this subject based on the ideXlab platform.

  • CDC - Control of a turbocharged Diesel engine fitted with high pressure and low pressure Exhaust Gas Recirculation systems
    Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference, 2009
    Co-Authors: Olivier Grondin, Philippe Moulin, Jonathan Chauvin
    Abstract:

    Exhaust Gas Recirculation is an effective way for reducing nitric oxides emissions in Diesel engine achieving low temperature combustion (LTC). Two strategies can be applied to recirculate burnt Gas in a turbocharged Diesel engine using the high pressure loop or the low pressure loop. This paper describes a generic model based control structure for Diesel engines with dual-loop Exhaust Gas Recirculation (EGR) and variable geometry turbocharger. An observer is designed to estimate the Exhaust Gas flow coming from the high pressure loop or from the low pressure loop. These estimates are used for the intake burnt Gas fraction control. This approach avoids direct measurement or implementation of additional sensors. In addition, a generic model based control based on motion planning is adapted to the low pressure EGR system. The main advantage of the approach is that turbocharger and Exhaust Gas Recirculation systems controllers have a limited number of calibration parameters. The observer and controller results are presented and validated on a LTC-Diesel engine with a dual-loop EGR system.

  • Control of a turbocharged Diesel engine fitted with high pressure and low pressure Exhaust Gas Recirculation systems
    Proceedings of the 48h IEEE Conference on Decision and Control CDC held jointly with 2009 28th Chinese Control Conference, 2009
    Co-Authors: Olivier Grondin, Philippe Moulin, Jonathan Chauvin
    Abstract:

    Exhaust Gas Recirculation is an effective way for reducing nitric oxides emissions in Diesel engine achieving low temperature combustion (LTC). Two strategies can be applied to recirculate burnt Gas in a turbocharged Diesel engine using the high pressure loop or the low pressure loop. This paper describes a generic model based control structure for Diesel engines with dual-loop Exhaust Gas Recirculation (EGR) and variable geometry turbocharger. An observer is designed to estimate the Exhaust Gas flow coming from the high pressure loop or from the low pressure loop. These estimates are used for the intake burnt Gas fraction control. This approach avoids direct measurement or implementation of additional sensors. In addition, a generic model based control based on motion planning is adapted to the low pressure EGR system. The main advantage of the approach is that turbocharger and Exhaust Gas Recirculation systems controllers have a limited number of calibration parameters. The observer and controller results are presented and validated on a LTC-Diesel engine with a dual-loop EGR system.

Momir Sjerić - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Study on Knock Sources in Spark Ignition Engine with Exhaust Gas Recirculation
    Energy Conversion and Management, 2018
    Co-Authors: Mladen Božić, Ante Vučetić, Momir Sjerić, Darko Kozarac, Zoran Lulić
    Abstract:

    Abstract The presented study aims to experimentally investigate the sources of influence of Exhaust Gas Recirculation on the tendency toward knock in the spark ignition engine. The three main sources of influence of Exhaust Gas Recirculation on the engine tendency towards knock are known. The influence on flame propagation changes the profile of combustion and therefore the end-Gas pressure and temperature profile. The thermal influence changes the thermal properties of the end-Gas mixture and consequently its temperature profile, while the chemical influence changes the kinetic behaviour of the end-Gas mixture. The study is based on the results from experimental setup with spark ignition engine that uses cooled Exhaust Gas Recirculation system and air heater installed into the intake manifold. Experimental tests that employ a new approach were performed, where intake temperature is varied by air heater when engine is operated with different levels of Exhaust Gas Recirculation. In this way the end-Gas temperature and Exhaust Gas Recirculation percentage were varied while the influence on flame propagation was partially compensated by the change of spark timing. The obtained results show that there is no clear chemical influence of the Exhaust Gases on the tendency towards knock as the cases with low and high levels of Exhaust Gas Recirculation are all mixed when the temperature of the end-Gas is set to the same values. This leads to the overall conclusion that the predominant factor in a tendency towards knock is the end-Gas temperature profile.

  • Efficiency improvement of a spark-ignition engine at full load conditions using Exhaust Gas Recirculation and variable geometry turbocharger – Numerical study
    Energy Conversion and Management, 2016
    Co-Authors: Momir Sjerić, Darko Kozarac, Ivan Taritaš, Rudolf Tomić, Mislav Blažić, Zoran Lulić
    Abstract:

    Abstract The numerical analysis of performance of a four cylinder highly boosted spark-ignition engine at full load is described in this paper, with the research focused on introducing high pressure Exhaust Gas Recirculation for control of engine limiting factors such as knock, turbine inlet temperature and cyclic variability. For this analysis the cycle-simulation model which includes modeling of the entire engine flow path, early flame kernel growth, mixture stratification, turbulent combustion, in-cylinder turbulence, knock and cyclic variability was applied. The cylinder sub-models such as ignition, turbulence and combustion were validated by using the experimental results of a naturally aspirated multi cylinder spark-ignition engine. The high load operation, which served as a benchmark value, was obtained by a standard procedure used in calibration of engines, i.e. operation with fuel enrichment and without Exhaust Gas Recirculation. By introducing Exhaust Gas Recirculation and by optimizing other engine operating parameters, the influence of Exhaust Gas Recirculation on engine performance is obtained. The optimum operating parameters, such as spark advance, intake pressure, air to fuel ratio, were found to meet the imposed requirements in terms of fuel consumption, knock occurrence, Exhaust Gas temperature and variation of indicated mean effective pressure. By comparing the results of the base point with the results that used Exhaust Gas Recirculation the improvement in fuel consumption of 8.7%, 11.2% and 1.5% at engine speeds of 2000 rpm, 3500 rpm and 5000 rpm is obtained. Additionally, by using the presented numerical methodology the influence of the specific operating parameter on the overall behavior of the complex charging system was shown.

Olivier Grondin - One of the best experts on this subject based on the ideXlab platform.

  • CDC - Control of a turbocharged Diesel engine fitted with high pressure and low pressure Exhaust Gas Recirculation systems
    Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference, 2009
    Co-Authors: Olivier Grondin, Philippe Moulin, Jonathan Chauvin
    Abstract:

    Exhaust Gas Recirculation is an effective way for reducing nitric oxides emissions in Diesel engine achieving low temperature combustion (LTC). Two strategies can be applied to recirculate burnt Gas in a turbocharged Diesel engine using the high pressure loop or the low pressure loop. This paper describes a generic model based control structure for Diesel engines with dual-loop Exhaust Gas Recirculation (EGR) and variable geometry turbocharger. An observer is designed to estimate the Exhaust Gas flow coming from the high pressure loop or from the low pressure loop. These estimates are used for the intake burnt Gas fraction control. This approach avoids direct measurement or implementation of additional sensors. In addition, a generic model based control based on motion planning is adapted to the low pressure EGR system. The main advantage of the approach is that turbocharger and Exhaust Gas Recirculation systems controllers have a limited number of calibration parameters. The observer and controller results are presented and validated on a LTC-Diesel engine with a dual-loop EGR system.

  • Control of a turbocharged Diesel engine fitted with high pressure and low pressure Exhaust Gas Recirculation systems
    Proceedings of the 48h IEEE Conference on Decision and Control CDC held jointly with 2009 28th Chinese Control Conference, 2009
    Co-Authors: Olivier Grondin, Philippe Moulin, Jonathan Chauvin
    Abstract:

    Exhaust Gas Recirculation is an effective way for reducing nitric oxides emissions in Diesel engine achieving low temperature combustion (LTC). Two strategies can be applied to recirculate burnt Gas in a turbocharged Diesel engine using the high pressure loop or the low pressure loop. This paper describes a generic model based control structure for Diesel engines with dual-loop Exhaust Gas Recirculation (EGR) and variable geometry turbocharger. An observer is designed to estimate the Exhaust Gas flow coming from the high pressure loop or from the low pressure loop. These estimates are used for the intake burnt Gas fraction control. This approach avoids direct measurement or implementation of additional sensors. In addition, a generic model based control based on motion planning is adapted to the low pressure EGR system. The main advantage of the approach is that turbocharger and Exhaust Gas Recirculation systems controllers have a limited number of calibration parameters. The observer and controller results are presented and validated on a LTC-Diesel engine with a dual-loop EGR system.

Darko Kozarac - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Study on Knock Sources in Spark Ignition Engine with Exhaust Gas Recirculation
    Energy Conversion and Management, 2018
    Co-Authors: Mladen Božić, Ante Vučetić, Momir Sjerić, Darko Kozarac, Zoran Lulić
    Abstract:

    Abstract The presented study aims to experimentally investigate the sources of influence of Exhaust Gas Recirculation on the tendency toward knock in the spark ignition engine. The three main sources of influence of Exhaust Gas Recirculation on the engine tendency towards knock are known. The influence on flame propagation changes the profile of combustion and therefore the end-Gas pressure and temperature profile. The thermal influence changes the thermal properties of the end-Gas mixture and consequently its temperature profile, while the chemical influence changes the kinetic behaviour of the end-Gas mixture. The study is based on the results from experimental setup with spark ignition engine that uses cooled Exhaust Gas Recirculation system and air heater installed into the intake manifold. Experimental tests that employ a new approach were performed, where intake temperature is varied by air heater when engine is operated with different levels of Exhaust Gas Recirculation. In this way the end-Gas temperature and Exhaust Gas Recirculation percentage were varied while the influence on flame propagation was partially compensated by the change of spark timing. The obtained results show that there is no clear chemical influence of the Exhaust Gases on the tendency towards knock as the cases with low and high levels of Exhaust Gas Recirculation are all mixed when the temperature of the end-Gas is set to the same values. This leads to the overall conclusion that the predominant factor in a tendency towards knock is the end-Gas temperature profile.

  • Efficiency improvement of a spark-ignition engine at full load conditions using Exhaust Gas Recirculation and variable geometry turbocharger – Numerical study
    Energy Conversion and Management, 2016
    Co-Authors: Momir Sjerić, Darko Kozarac, Ivan Taritaš, Rudolf Tomić, Mislav Blažić, Zoran Lulić
    Abstract:

    Abstract The numerical analysis of performance of a four cylinder highly boosted spark-ignition engine at full load is described in this paper, with the research focused on introducing high pressure Exhaust Gas Recirculation for control of engine limiting factors such as knock, turbine inlet temperature and cyclic variability. For this analysis the cycle-simulation model which includes modeling of the entire engine flow path, early flame kernel growth, mixture stratification, turbulent combustion, in-cylinder turbulence, knock and cyclic variability was applied. The cylinder sub-models such as ignition, turbulence and combustion were validated by using the experimental results of a naturally aspirated multi cylinder spark-ignition engine. The high load operation, which served as a benchmark value, was obtained by a standard procedure used in calibration of engines, i.e. operation with fuel enrichment and without Exhaust Gas Recirculation. By introducing Exhaust Gas Recirculation and by optimizing other engine operating parameters, the influence of Exhaust Gas Recirculation on engine performance is obtained. The optimum operating parameters, such as spark advance, intake pressure, air to fuel ratio, were found to meet the imposed requirements in terms of fuel consumption, knock occurrence, Exhaust Gas temperature and variation of indicated mean effective pressure. By comparing the results of the base point with the results that used Exhaust Gas Recirculation the improvement in fuel consumption of 8.7%, 11.2% and 1.5% at engine speeds of 2000 rpm, 3500 rpm and 5000 rpm is obtained. Additionally, by using the presented numerical methodology the influence of the specific operating parameter on the overall behavior of the complex charging system was shown.