Search results for "compound engine"

showing 3 items of 3 documents

Hybrid Propulsion Efficiency Increment through Exhaust Energy Recovery—Part 1: Radial Turbine Modelling and Design

2023

The efficiency of Hybrid Electric Vehicles (HEVs) may be substantially increased if the energy of the exhaust gases, which do not complete the expansion inside the cylinder of the internal combustion engine, is efficiently recovered by means of a properly designed turbogenerator and employed for vehicle propulsion; previous studies, carried out by the same authors of this work, showed a potential hybrid vehicle fuel efficiency increment up to 15% by employing a 20 kW turbine on a 100 HP rated power thermal unit. The innovative thermal unit here proposed is composed of a supercharged engine endowed with a properly designed turbogenerator, which comprises two fundamental elements: an exhaust …

Control and OptimizationSettore ING-IND/08 - Macchine A FluidoRenewable Energy Sustainability and the Environmentcompound engine exhaust energy recovery exhaust gas turbine hybrid vehicleEnergy Engineering and Power Technologyhybrid vehicle; compound engine; exhaust gas turbine; exhaust energy recoveryBuilding and ConstructionElectrical and Electronic EngineeringEngineering (miscellaneous)Energy (miscellaneous)
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The Potential of a Separated Electric Compound Spark-Ignition Engine for Hybrid Vehicle Application

2022

Abstract In-cylinder expansion of internal combustion engines based on Diesel or Otto cycles cannot be completely brought down to ambient pressure, causing a 20% theoretical energy loss. Several systems have been implemented to recover and use this energy such as turbocharging, turbomechanical and turbo-electrical compounding, or the implementation of Miller cycles. In all these cases however, the amount of energy recovered is limited allowing the engine to reach an overall efficiency incremental improvement between 4% and 9%. Implementing an adequately designed expander–generator unit could efficiently recover the unexpanded exhaust gas energy and improve efficiency. In this work, the appl…

Fuel TechnologySettore ING-IND/08 - Macchine A FluidoNuclear Energy and Engineeringcompound engineMechanical Engineeringexhaust energy recoveryEnergy Engineering and Power TechnologyAerospace Engineeringspark-ignition engineHybrid vehicle
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Efficiency advantages of the separated electric compound propulsion system for CNG hybrid vehicles

2021

As is widely known, internal combustion engines are not able to complete the expansion process of the gas inside the cylinder, causing theoretical energy losses in the order of 20%. Several systems and methods have been proposed and implemented to recover the unexpanded gas energy, such as turbocharging, which partially exploits this energy to compress the fresh intake charge, or turbo-mechanical and turbo-electrical compounding, where the amount of unexpanded gas energy not used by the compressor is dedicated to propulsion or is transformed into electric energy. In all of these cases, however, maximum efficiency improvements between 4% and 9% have been achieved. In this work, the authors d…

TechnologyControl and Optimizationcompound engineRenewable Energy Sustainability and the EnvironmentThybrid vehicleexhaust energy recoveryEnergy Engineering and Power TechnologyCNG spark-ignition engineCNG spark-ignition engine Compound engine Exhaust energy recovery hybrid vehicleSettore ING-IND/08 - Macchine A Fluidohybrid vehicle; compound engine; CNG spark-ignition engine; exhaust energy recoveryElectrical and Electronic EngineeringEngineering (miscellaneous)Energy (miscellaneous)
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