Advanced Control System of Variable Compression Ratio (VCR) Engine with Dual Piston Mechanism

Kadota, M.; Ishikawa, S.; Yamamoto, Kenichi; Kato, M.; Kawajiri, S.

doi:10.4271/2009-01-1063

Cited by 26 publications

(7 citation statements)

References 10 publications

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“…Alberto Boretti and Joseph Scalzo presented a new design of a variable compression ratio engine with a multi-link mechanism [16]. For Honda, a dual-piston system can adjust the CR with a hydraulic system and a spring [17]. A new approach of a self-controlling variable compression ratio connecting rod was used by Frank Stefan Will and Dylan Mayson [18].…”

Section: Introductionmentioning

confidence: 99%

A Predictive Study of a New VCR Engine with High Expansion Ratio and High-Efficiency Potential under Heavy Load Conditions

Lin

Yang

2020

Energies

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Facing the future, whether working alone or with electric motors, a new type of variable compression ratio (VCR) engine that can achieve a high thermal efficiency under heavy load conditions is necessary. Hence, we propose a dual shaft control variable compression ratio (DSC-VCR) engine based on a gear-driven eccentric sleeve. With the improved position of gears, DSC-VCR allows for double larger gears to share the load, and the engine can operate with a larger eccentric size and a narrower adjustment range compared to other similar mechanisms. This helps to reduce the difficulty of chamber shape design, avoid collisions between valves and piston, and above all, makes the engine operate with a larger overexpansion ratio (OER, the ratio of expansion stroke and compression stroke) under all conditions to improve engine efficiency. Based on a 1.5 T four-cylinder engine, the OER can be increased to over 1.16 with the eccentric size of 6.5 mm. According to the theoretical thermal efficiency calculation while considering turbocharging, the per millimeter increase of eccentric size improves the theoretical efficiency by 0.0025–0.006. The predictive simulation presented that the reduction of residual gas helps to increase the compression ratio (CR) from 9.5 to 10.1 under a full load condition. Larger OERs and CRs help to reduce brake specific fuel consumption (BSFC) by 6%–8%. In the case of a 75% load, about 3.51% of efficiency increase was realized. All of these prove that DSC-VCR is a high-efficiency potential mechanism for the future.

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Section: Introductionmentioning

confidence: 99%

A Predictive Study of a New VCR Engine with High Expansion Ratio and High-Efficiency Potential under Heavy Load Conditions

Lin

Yang

2020

Energies

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“…In recent years, a considerable amount of research effort has been involved in the controlling of diesel PCCI combustion phasing. Several potential control methods have been conducted, like fuel–air mixing enhancement, − intake charge heating system, external exhaust gas recirculation (EGR), , internal EGR, variable compression ratio (VCR), , variable valve timing (VVT), , and multiple injection strategies. , One potential methodPCCI engines fitted with the VCR technologywas considered to control the combustion phasing and extend the clean combustion operation range with decreased compression ratio at high loads. However, the practical feasibility, expensive costs, and machining effort are the application constraints of the VCR technology. , VVT was supposed to be another feasible approach to be applied in PCCI combustion.…”

Section: Introductionmentioning

confidence: 99%

“…Several potential control methods have been conducted, like fuel–air mixing enhancement, − intake charge heating system, external exhaust gas recirculation (EGR), , internal EGR, variable compression ratio (VCR), , variable valve timing (VVT), , and multiple injection strategies. , One potential methodPCCI engines fitted with the VCR technologywas considered to control the combustion phasing and extend the clean combustion operation range with decreased compression ratio at high loads. However, the practical feasibility, expensive costs, and machining effort are the application constraints of the VCR technology. , VVT was supposed to be another feasible approach to be applied in PCCI combustion. With a late intake valve closing (IVC) timing, the combustion phasing can be retarded, and the range of engine load could also be extended, while the combustion efficiency generally decreases due to the pumping loss. , EGR was often used in diesel PCCI engines .…”

Section: Introductionmentioning

confidence: 99%

Investigation of Effects of Air Jet Pressure and Temperature on High-Pressure Air Jet Controlled Compression Ignition Combustion Based on a Novel Thermodynamic Cycle

et al. 2015

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To control premixed charge compression ignition (PCCI) phasing in internal combustion engines, a novel method called high-pressure air jet controlled compression ignition (JCCI) based on compound thermodynamic cycle was proposed to achieve diesel premixed combustion in all load operations. The method is implemented in a hybrid pneumatic engine (HPE). The application of HPE is also beneficial to the fuel consumption and emissions because of its several flexible operation modes. The purpose of this paper is to investigate the in-cylinder high-pressure air JCCI combustion processes in the power cylinder of HPE. A three-dimensional (3D) computational fluid dynamics (CFD) model coupled with reduced n-heptane chemical kinetics has been developed to analyze the effects of high-pressure air jet pressure and temperature on the in-cylinder ignition and combustion characteristics. The results demonstrated that the diesel premixture combustion phasing can be controlled near the top dead center (TDC) with the variations of air jet pressure and temperature. For the combustion characteristics, the local region of the in-cylinder mixture is compressed and ignited by the high-pressure air jet. Intensified low-temperature reaction and two-stage high-temperature reaction can also be observed. Low jet pressure and high jet temperature have the potential of obtaining high efficiency due to the rapid combustion.

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“…The flexibility of the ICEs will be increased significantly if variable compression ratio control can be achieved during the engine operation. Different variable compression ratio mechanisms have been proposed before [1][2][3]. Most proposals modified the crank/connecting rod mechanism with mechanical linkages and an actuation system.…”

Section: Introductionmentioning

confidence: 99%

Motion control of a hydraulic free-piston engine

Sadighi

Sun

2012

2012 American Control Conference (ACC)

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Free-piston engine (FPE), as an alternative of the conventional internal combustion engine, has a high potential in terms of energy saving given its wide range of potential applications and high efficiency. One of the technical barriers that prevents the wide spread of this technology is the lack of precise piston motion control. This paper presents a novel strategy on the motion control of a hydraulic FPE. A robust repetitive controller is designed and implemented to form a virtual crankshaft that would provide a precise and stable engine operation. Based on the controller, a hardware-in-theloop (HIL) environment that integrates the combustion chamber dynamics with the hydraulic system is developed to further validate the proposed control design. The experimental data of engine motoring tests with virtual crankshaft control demonstrates the effectiveness of the proposed approach.

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Advanced Control System of Variable Compression Ratio (VCR) Engine with Dual Piston Mechanism

Cited by 26 publications

References 10 publications

A Predictive Study of a New VCR Engine with High Expansion Ratio and High-Efficiency Potential under Heavy Load Conditions

A Predictive Study of a New VCR Engine with High Expansion Ratio and High-Efficiency Potential under Heavy Load Conditions

Investigation of Effects of Air Jet Pressure and Temperature on High-Pressure Air Jet Controlled Compression Ignition Combustion Based on a Novel Thermodynamic Cycle

Motion control of a hydraulic free-piston engine

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