A comparison between Miller and five-stroke cycles for enabling deeply downsized, highly boosted, spark-ignition engines with ultra expansion

Li, Tie; Wang, Bin; Zheng, Bin

doi:10.1016/j.enconman.2016.06.038

Cited by 43 publications

(12 citation statements)

References 40 publications

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“…The decisive factor here was the specific feature of the fivestroke engine in which the fired cylinder can have optimum parameters due to high specific power, while the use of an additional expansion process in a separate cylinder enables the engine to achieve a higher level of thermal efficiency. Currently, five-stroke engines are being developed in several research and development facilities [2,28]. Due to the specific features of these engines, they are suitable for the purpose of driving an on board or a stationary electric generator.…”

Section: Increased Expansion Ratiomentioning

confidence: 99%

A three-way catalyst system for a five-stroke engine

Noga¹

2019

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This paper presents the results of research on the development of an exhaust gas aftertreatment system for a turbocharged five-stroke engine. This engine was designed and constructed at Cracow University of Technology. A characteristic feature of the five-stroke engine is the use of an additional expansion process to increase overall efficiency. A challenge for a catalytic converter is the fact that it has a low exhaust gas temperature. Two three-way catalytic converters were tested-one with a ceramic support and the second with a metal support. The results of the tests showed that the reactor with a ceramic support obtains an acceptable conversion efficiency starting with an exhaust gas temperature of 280°C. For the metal-support reactor, a few percent increase in torque and a decrease in the brake-specific fuel consumption of the engine was obtained; however, the converter itself did not show signs of operation even with an exhaust gas temperature of over 380°C. The performed analyses highlighted directions of further development works in this area.

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Section: Increased Expansion Ratiomentioning

confidence: 99%

A three-way catalyst system for a five-stroke engine

Noga¹

2019

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“…Turbocharging and boosting are key technologies in the continued drive for improved internal combustion engine efficiency with reduced emissions [1]. For more than a decade, engine boosting has seen widespread adoption by passenger and heavy goods vehicle powertrains in order to increase the specific power and enable the downsizing megatrend [2].…”

Section: Introductionmentioning

confidence: 99%

A Hybrid End-to-End Control Strategy Combining Dueling Deep Q-network and PID for Transient Boost Control of a Diesel Engine with Variable Geometry Turbocharger and Cooled EGR

et al. 2019

Energies

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Deep reinforcement learning (DRL), which excels at solving a wide variety of Atari and board games, is an area of machine learning that combines the deep learning approach and reinforcement learning (RL). However, to the authors’ best knowledge, there seem to be few studies that apply the latest DRL algorithms on real-world powertrain control problems. If there are any, the requirement of classical model-free DRL algorithms typically for a large number of random exploration in order to realize good control performance makes it almost impossible to implement directly on a real plant. Unlike most of the other DRL studies, whose control strategies can only be trained in a simulation environment—especially when a control strategy has to be learned from scratch—in this study, a hybrid end-to-end control strategy combining one of the latest DRL approaches—i.e., a dueling deep Q-network and traditional Proportion Integration Differentiation (PID) controller—is built, assuming no fidelity simulation model exists. Taking the boost control of a diesel engine with a variable geometry turbocharger (VGT) and cooled (exhaust gas recirculation) EGR as an example, under the common driving cycle, the integral absolute error (IAE) values with the proposed algorithm are improved by 20.66% and 9.7% respectively for the control performance and generality index, compared with a fine-tuned PID benchmark. In addition, the proposed method can also improve system adaptiveness by adding another redundant control module. This makes it attractive to real plant control problems whose simulation models do not exist, and whose environment may change over time.

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“…Extensive simulation studies of a similar engine, but with a single-cylinder of additional expansion, was also carried out by Li et al at Shanghai Jiao Tong University [18,19]. Initial simulation studies on a five-stroke engine were also performed by Palanivendhan et al [20].…”

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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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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A comparison between Miller and five-stroke cycles for enabling deeply downsized, highly boosted, spark-ignition engines with ultra expansion

Cited by 43 publications

References 40 publications

A three-way catalyst system for a five-stroke engine

A three-way catalyst system for a five-stroke engine

A Hybrid End-to-End Control Strategy Combining Dueling Deep Q-network and PID for Transient Boost Control of a Diesel Engine with Variable Geometry Turbocharger and Cooled EGR

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

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