Liviu Giurca - Academia.edu (original) (raw)
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Conference Presentations by Liviu Giurca
Purpose Pollutant emissions and energy management for vehicles are subjects well debated during n... more Purpose Pollutant emissions and energy management for vehicles are subjects well debated during nowadays. Current regulations concern all energy conversions from fuel to energy to wheel, taking into account all the possibilities for improving existing solutions to developing new innovative ones. The benefits coming from fuel conversion efficiency are addressing the immediate and specific needs for reducing fossil fuel consumption, greenhouse gasses and engine internal losses. The research purpose consists in finding new innovative solutions in order to reduce the energy losses and to increase power density for engines. Design/Methodology/Approach Several research activities confirmed the existence of some efficient engines already tested and produced. Different design solutions were used without including solutions for recovering heat, but obtaining 52% Brake Mean Efficiency and highly increased compression ratio. The fuel cell technology based on hydrogen utilization was considered by many specialists as the future global technology to be used on engines. The proposed researched engine is able to reach high internal pressure, high compression ratio and partially recovering energy losses as thermal losses from the exhaust gasses, the cooling system and the incomplete combustion. Based on the Patent RO130861, the researched engine has several design solutions. Starting from a double-state supercharged engine that reveals high compression ratio and high power density, an opposed pistons engine comes with several improvements: ultra-low noise and vibration level, reduced NOx, limited heat exchange, fuel economy, compact and robust shape. The hybrid engine is dedicated to hybrid powertrains and as the range extender for electric powertrains, being an easy to integrate and less expensive solution. Findings The researched approaches took into account the usage of different working fluids (water, liquid nitrogen, liquid air), but some of them are not able to facilitate the heat recovering. The opposed pistons engine has long expansion similar to the Atkinson cycle and two different places, the engine cylinder and the auxiliary cylinder. The auxiliary cylinder works as a pneumatic two-stroke engine. The hybrid engine used as range extender can be modular and easy to handle as a portable unit, its weight being almost 24 kg, offering the possibility to be used independently. The researched engine can be used as part of the power plants to generate electricity for backup system especially.
Papers by Liviu Giurca
IOP conference series. Materials science and engineering, Mar 1, 2024
IOP conference series. Materials science and engineering, Mar 1, 2024
IOP conference series. Materials science and engineering, Mar 1, 2024
International Journal of Unmanned Systems Engineering, 2014
Purpose Pollutant emissions and energy management for vehicles are subjects well debated during n... more Purpose Pollutant emissions and energy management for vehicles are subjects well debated during nowadays. Current regulations concern all energy conversions from fuel to energy to wheel, taking into account all the possibilities for improving existing solutions to developing new innovative ones. The benefits coming from fuel conversion efficiency are addressing the immediate and specific needs for reducing fossil fuel consumption, greenhouse gasses and engine internal losses. The research purpose consists in finding new innovative solutions in order to reduce the energy losses and to increase power density for engines. Design/Methodology/Approach Several research activities confirmed the existence of some efficient engines already tested and produced. Different design solutions were used without including solutions for recovering heat, but obtaining 52% Brake Mean Efficiency and highly increased compression ratio. The fuel cell technology based on hydrogen utilization was considered by many specialists as the future global technology to be used on engines. The proposed researched engine is able to reach high internal pressure, high compression ratio and partially recovering energy losses as thermal losses from the exhaust gasses, the cooling system and the incomplete combustion. Based on the Patent RO130861, the researched engine has several design solutions. Starting from a double-state supercharged engine that reveals high compression ratio and high power density, an opposed pistons engine comes with several improvements: ultra-low noise and vibration level, reduced NOx, limited heat exchange, fuel economy, compact and robust shape. The hybrid engine is dedicated to hybrid powertrains and as the range extender for electric powertrains, being an easy to integrate and less expensive solution. Findings The researched approaches took into account the usage of different working fluids (water, liquid nitrogen, liquid air), but some of them are not able to facilitate the heat recovering. The opposed pistons engine has long expansion similar to the Atkinson cycle and two different places, the engine cylinder and the auxiliary cylinder. The auxiliary cylinder works as a pneumatic two-stroke engine. The hybrid engine used as range extender can be modular and easy to handle as a portable unit, its weight being almost 24 kg, offering the possibility to be used independently. The researched engine can be used as part of the power plants to generate electricity for backup system especially.
IOP conference series. Materials science and engineering, Mar 1, 2024
IOP conference series. Materials science and engineering, Mar 1, 2024
IOP conference series. Materials science and engineering, Mar 1, 2024
International Journal of Unmanned Systems Engineering, 2014