Development and validation of a 5 stroke engine for range extenders application

Kéromnès, Alan; Delaporte, B.; Schmitz, Gerhard; Moyne, Luis Le

doi:10.1016/j.enconman.2014.03.025

Cited by 33 publications

(29 citation statements)

References 50 publications

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“…Kéromnès et al showed a significantly higher ratio of the indicated work of the additional expansion cylinder to the indicated work of the fired cylinder. They obtained a value of about 18%- [14] (p. 265).  During the engine testing, a high value of load was obtained, from which the cylinders of additional expansion of the engine gave power to the output.…”

mentioning

confidence: 98%

“…An entirely different approach to the problem of an internal combustion engine with an expansion ratio greater than the compression ratio was applied in the five-stroke engine developed according to the concept by Gerhard Schmitz [13,14]. In this engine, a significantly increased expansion is done after the exhaust process by a second expansion of the working medium in a separate cylinder.…”

Section: Introductionmentioning

confidence: 99%

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Selected Issues of the Indicating Measurements in a Spark Ignition Engine with an Additional Expansion Process

Noga

2017

Applied Sciences

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Abstract:The paper presents the results of research on the turbocharged spark ignition engine with additional exhaust expansion in a separate cylinder, which is commonly known as the five-stroke engine. The research engine has been constructed based on the four cylinder engine in which two outer cylinders work as the fired cylinders, while two internally connected inner cylinders constitute the volume of the additional expansion process. The engine represents a powertrain realizing an ultra-expansion cycle. The purpose of the study was to find an effective additional expansion process in the five-stroke engine. Cylinder-pressure indicating measurements were carried out for one of the fired cylinders and the additional expansion cylinder. The study was performed for over 20 different points on the engine operation map. This allowed us to determine a dependence between the pressure indicated in the fired cylinders and in the additional expansion cylinders. A function of the mean pressure indicated in the additional expansion cylinder versus a brake mean effective pressure was also presented. This showed a load threshold from which the work of the cylinders of additional expansion produced benefits for the output of the experimental engine. The issues of mechanical efficiency and effective efficiency of this engine were also discussed.

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mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Selected Issues of the Indicating Measurements in a Spark Ignition Engine with an Additional Expansion Process

Noga

2017

Applied Sciences

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“…While this is a more significant departure from the split-cycle concept as there is no two-stroke compressor, the five-stroke has potential advantages of a second expansion stroke through increasing the effective expansion ratio. The Ilmor five-stroke engine [45] is a practical example of this concept and consists of two four-stroke cylinders which transfer the partially expanded combustion products to a secondary expander. The five-stroke prototype has demonstrated a 226 g/kWh which is equivalent to a 36.1% fuel efficiency, with pre-catalyst emissions in line with typical SI engines.…”

Section: Split-cycle With Four-stroke Combustion Cylindermentioning

confidence: 99%

A review of split-cycle engines

Finneran

Garner

Bassett

et al. 2018

International Journal of Engine Research

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This article reviews split-cycle internal combustion engine designs. The review includes historical work, assessment of prototypes and discussion of the most recent designs. There has been an abundance of split-cycle engine designs proposed since the first in 1872. Despite this, very few prototypes exist, and no split-cycle engines are reported to be in series production. The few split-cycle prototypes that have been developed have faced practical challenges contributing to limited performance. These challenges include air flow restrictions into the expansion cylinder, late combustion, thermal management issues, and mechanical challenges with the crossover valve actuation mechanism. The main promoted advantage of split-cycle engines is the increased thermal efficiency compared to conventional internal combustion engines. However, an efficiency improvement has not thus far been demonstrated in published test data. The thermodynamic studies reviewed suggest that split-cycle engines should be more efficient than conventional four-stroke engines. Reasons why increased thermal efficiency is not realised in practice could be due to practical compromises, or due to inherent architectural split-cycle engine design limitations. It was found that the number of split-cycle engine patents has increased significantly over recent years, suggesting an increased commercial interest in the concept since the possibility of increased efficiency becomes more desirable and might outweigh the drawbacks of practical challenges.

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“…This efficiency can be achieved for an engine speed of 4000 rpm and a brake power of 32.5 kW, which are notable scores for an MPI two valve per cylinder engine. Expected optimum should be below 217 g/kWh BSFC and over 90 Nm torque [17]. In last premier studied,…”

Section: Introductionmentioning

confidence: 99%

Performance and driveline analyses of engine capacity in range extender engine hybrid vehicle

Praptijanto¹,

Santoso²,

Nur³

et al. 2017

AIP Conference Proceedings

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Abstract. In this study, range extender engine designed should be able to meet the power needs of a power generator of hybrid electrical vehicle that has a minimum of 18 kW. Using this baseline model, the following range extenders will be compared between conventional SI piston engine (Baseline, BsL), engine capacity 1998 cm3, and efficiency-oriented SI piston with engine capacity 999 cm3 and 499 cm3 with 86 mm bore and stroke square gasoline engine in the performance, emission prediction of range extender engine, standard of charge by using engine and vehicle simulation software tools. In AVL Boost simulation software, range extender engine simulated from 1000 to 6000 rpm engine loads. The highest peak engine power brake reached up to 38 kW at 4500 rpm. On the other hand the highest torque achieved in 100 Nm at 3500 rpm. After that using AVL cruise simulation software, the model of range extended electric vehicle in series configuration with main components such as internal combustion engine, generator, electric motor, battery and the arthemis model rural road cycle was used to simulate the vehicle model. The simulation results show that engine with engine capacity 999 cm3 reported the economical performances of the engine and the emission and the control of engine cycle parameters.

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Development and validation of a 5 stroke engine for range extenders application

Cited by 33 publications

References 50 publications

Selected Issues of the Indicating Measurements in a Spark Ignition Engine with an Additional Expansion Process

Selected Issues of the Indicating Measurements in a Spark Ignition Engine with an Additional Expansion Process

A review of split-cycle engines

Performance and driveline analyses of engine capacity in range extender engine hybrid vehicle

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