High Efficiency Hybrid Cycle Engine

Nabours, Stephen; Shkolnik, Nikolay; Nelms, Ryan; Gnanam, G.; Shkolnik, Alexander

doi:10.4271/2010-01-1110

Cited by 15 publications

(4 citation statements)

References 3 publications

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“…Intake and compression strokes are carried out by one piston, while exhaust and expansion strokes are done by the other. In contrast to traditional engines, one can expect a decrease in energy losses, moving components, and weight and height [26]. The principal idea is to increase the thermal efficiency of IC engines [35].…”

Section: Hybrid Thermal Cyclementioning

confidence: 99%

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Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

2022

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Improving thermal efficiency and reducing carbon emissions are the permanent themes for internal combustion (IC) engines. In the past decades, various advanced strategies have been proposed to achieve higher efficiency and cleaner combustion with the increasingly stringent fuel economy and emission regulations. This article reviews the recent progress in the improvement of thermal efficiency of IC engines and provides a comprehensive summary of the latest research on thermal efficiency from aspects of thermodynamic cycles, gas exchange systems, advanced combustion strategies, and thermal and energy management. Meanwhile, the remaining challenges in different modules are also discussed. It shows that with the development of advanced technologies, it is highly positive to achieve 55% and even over 60% in effective thermal efficiency for IC engines. However, different technologies such as hybrid thermal cycles, variable intake systems, extreme condition combustion (manifesting low temperature, high pressure, and lean burning), and effective thermal and energy management are suggested to be closely integrated into the whole powertrains with highly developed electrification and intelligence.

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Section: Hybrid Thermal Cyclementioning

confidence: 99%

“…Consequently, more heat energy can be converted into useful work. The main characteristics of the hybrid thermal cycle include [26]:…”

Section: Hybrid Thermal Cyclementioning

confidence: 99%

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Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

2022

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“…Skip-cycling is a control strategy which may be uniquely suitable to rotary compression-ignition engines [10]. If such control is utilized, the non-firing cycles will have an additional cooling effect on the engine.…”

Section: Coolingmentioning

confidence: 99%

Development of a Small Rotary SI/CI Combustion Engine

Shkolnik¹,

Littera²,

Nickerson³

et al. 2014

SAE Technical Paper Series

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This paper describes the development of small rotary internal combustion engines developed to operate on the High Efficiency Hybrid Cycle (HEHC). The cycle, which combines high compression ratio (CR), constant-volume (isochoric) combustion, and overexpansion, has a theoretical efficiency of 75% using air-standard assumptions and first-law analysis. This innovative rotary engine architecture shows a potential indicated efficiency of 60% and brake efficiency of >50%. As this engine does not have poppet valves and the gas is fully expanded before the exhaust stroke starts, the engine has potential to be quiet. Similar to the Wankel rotary engine, the 'X' engine has only two primary moving partsa shaft and rotor, resulting in compact size and offering low-vibration operation. Unlike the Wankel, however, the X engine is uniquely configured to adopt the HEHC cycle and its associated efficiency and low-noise benefits. The result is an engine which is compact, lightweight, low-vibration, quiet, and fuel-efficient. Two prototype engines are discussed. The first engine is the larger X1 engine (70hp), which operates on the HEHC with compression-ignition (CI) of diesel fuel. A second engine, the XMv3, is a scaled down X engine (70cc / 3HP) which operates with spark-ignition (SI) of gasoline fuel. Scaling down the engine presented unique challenges, but many of the important features of the X engine and HEHC cycle were captured. Preliminary experimental results including firing analysis are presented for both engines. Further tuning and optimization is currently underway to fully exploit the advantages of HEHC with the X architecture engines.

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Understanding the performance of the multiple injection gasoline partially premixed combustion concept implemented in a 2-Stroke high speed direct injection compression ignition engine

et al. 2016

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ElsevierBenajes Calvo, JV.; Martín Díaz, J.; Novella Rosa, R.; Thein, KJL. (2016). Understanding the performance of the multiple injection gasoline partially premixed combustion concept implemented in a 2-Stroke high speed direct injection compression ignition engine. Applied Energy. 161:465-475. doi:10.1016Energy. 161:465-475. doi:10. /j.apenergy.2015 Understanding the performance of the multiple injection Gasoline PPC concept implemented in a 2-stroke HSDI diesel engine with good combustion stability (CoV (IMEP) below 3%), high combustion efficiency (over 97%), and low NO x /soot levels.In this context, present research focuses on the two main specific drawbacks of this concept.Firstly, the high BSFC resulting from the work required by the mechanical supercharger to sustain the needs in air management since the turbocharging system is not sufficient at low speeds. Secondly the high level of noise generated by the combustion process is known as a matter regarding customers' expectations, especially at high loads. Therefore, a dedicated analysis has been carried out to fully exploit the benefits of the gasoline PPC concept combined with the innovative 2-stroke engine architecture with the aim of identify and break the most relevant trade-offs.

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High Efficiency Hybrid Cycle Engine

Cited by 15 publications

References 3 publications

Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges

Development of a Small Rotary SI/CI Combustion Engine

Understanding the performance of the multiple injection gasoline partially premixed combustion concept implemented in a 2-Stroke high speed direct injection compression ignition engine

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