Opportunities for Electrified Internal Combustion Engines

Conway, Graham; Chambon, Paul; Alger, Terrence

doi:10.4271/2020-01-0281

Cited by 10 publications

(7 citation statements)

References 7 publications

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“…The specifications (maps) of turbocharger and supercharger significantly affect engine performance and need to be optimized for specific applications [33]. In this study, the focus is to exploit the impact of key engine parameters and boost strategies on the overall engine performance.…”

Section: Engine Simulation Modelsmentioning

confidence: 99%

Analysis of the Boost System for a High Performance 2-Stroke Boosted Uniflow Scavenged Direct Injection Gasoline (BUSDIG) Engine

Wang¹,

Zhao²

2020

SAE Technical Paper Series

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A 2-stroke boosted uniflow scavenged direct injection gasoline (BUSDIG) engine was researched and developed at Brunel University London to achieve higher power-to-mass ratio and thermal efficiency. In the BUSDIG engine concept, the intake scavenge ports are integrated to the cylinder liner and controlled by the movement of piston top while exhaust valves are placed in the cylinder head. Systematic studies on scavenging ports, intake plenum, piston design, valve opening profiles and fuel injection strategies have been performed to investigate and optimise the scavenging performance and in-cylinder fuel/air mixing process for optimised combustion process. In order to achieve superior power performance with higher thermal efficiency, the evaluation and optimisation of the boost system for a 1.0 L 2-cylinder 2-stroke BUSDIG engine were performed in this study using one dimensional (1D) engine simulations. The results show that the engine exhaust valve opening (EVO) timing and exhaust duration (ED) are key parameters affecting the engine performance with the single-stage turbocharging (T). By using an earlier EVO timing of 80 ⁰CA and a longer ED of 140 ⁰CA, a maximum brake power of 130.7 kW could be achieved at 3200 rpm and peak torque output of 488 N*m at 1600 rpm. Simulations were also performed to evaluate the engine performance with combined boost systems with a supercharger upstream the turbocharger (S-T) and a turbocharger upstream the supercharger (T-S). The results indicate that the combined boost systems increase both engine power and torque compared to the single-stage turbocharging system. In particular, the peak brake power and torque of the 1.0 L BUSDIG engine could reach 143.7 kW at 4000 rpm and 492 N*m at 800 rpm with the S-T setup.

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Section: Engine Simulation Modelsmentioning

confidence: 99%

Analysis of the Boost System for a High Performance 2-Stroke Boosted Uniflow Scavenged Direct Injection Gasoline (BUSDIG) Engine

Wang¹,

Zhao²

2020

SAE Technical Paper Series

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“…Huang et al [8] tested two pairs of conventional and full-hybrid gasoline vehicles on three real routes by using portable emission measurement systems; and they found fuel improvements of 23-49% in favor of the hybrid concepts. The success of powertrain hybridization combined with SI engines is mainly built on the reduction of the engine operating time at low load, where pumping and friction losses are high in relative terms [9,10], and the simplicity of the three-way catalyst (TWC) compared with diesel aftertreatment systems [11].…”

Section: Introductionmentioning

confidence: 99%

Analysis on the potential of EGR strategy to reduce fuel consumption in hybrid powertrains based on advanced gasoline engines under simulated driving cycle conditions

Climent

Dolz

Plá

et al. 2022

Energy Conversion and Management

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“…In search of greener transport solutions, hybrid powertrains based on advanced sparkignition (SI) engines, usually fueled with gasoline, have become one of the most common propulsion systems in new passenger cars. This solution is successful due to the reduction of SI engine operation at low load conditions [1,2], and to the lower complexity of the three-way catalyst compared to diesel aftertreatment devices [3]. Regarding the state of the art in SI engines, an extended strategy to enhance fuel economy in this kind of engines is the combination of downsizing and direct fuel injection, while turbocharging is used to compensate the consequent power loss.…”

Section: Introductionmentioning

confidence: 99%

Compressor Surge Mitigation in Turbocharged Spark-Ignition Engines without an Anti-Surge Control System during Load-Decrease Operation

et al. 2022

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Automotive manufacturers are showing an increasing preference for hybrid powertrains based on advanced gasoline engines. The most extended solution to improve fuel economy in these engines consists in downsizing with direct injection, while turbocharging is required to compensate the consequent power loss. However, turbocharging is associated with different issues, such as compressor surge. It can appear during fast throttle closings (tip-outs), when the engine air flow is abruptly reduced. A usual strategy to manage this kind of maneuver is the installation of an anti-surge valve (ASV) that connects the compressor inlet and outlet when approaching the surge limit. In pursuit of cost reduction, the removal of the ASV system was assessed in this research. To this end, tip-outs without ASV were tested in a turbocharged gasoline engine equipped with a low-pressure EGR loop, and two strategies were analyzed: throttle closure optimization and reduction of the compressor inlet pressure through the intake flap (located upstream of the compressor to increase the EGR rate). The instantaneous compressor outlet pressure and its time derivative were used for surge detection. Experimental tip-outs without ASV revealed that applying a certain intake flap closing combined with an optimized throttle actuation led to a fast torque decrease, similar to that observed for the reference case with ASV, without compressor instabilities.

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Opportunities for Electrified Internal Combustion Engines

Cited by 10 publications

References 7 publications

Analysis of the Boost System for a High Performance 2-Stroke Boosted Uniflow Scavenged Direct Injection Gasoline (BUSDIG) Engine

Analysis of the Boost System for a High Performance 2-Stroke Boosted Uniflow Scavenged Direct Injection Gasoline (BUSDIG) Engine

Analysis on the potential of EGR strategy to reduce fuel consumption in hybrid powertrains based on advanced gasoline engines under simulated driving cycle conditions

Compressor Surge Mitigation in Turbocharged Spark-Ignition Engines without an Anti-Surge Control System during Load-Decrease Operation

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