Adaptation of a Dual Continuous Variable Cam Phasing System to a 4-Valve, 4-Cylinder Engine - Thermodynamic Benefits and Engine Hardware Requirements

Poepperl, Manfred; Hedrich, Georg; Heusler, Helmut; Koehler, D.; Marin, Bernhard; Rothenberger, Peter; Scharrer, Otmar

doi:10.4271/2006-01-0408

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…Production VVT systems typically vary the relative camshaft position (cam phasing angle) [5][6][7][8][9] or using more than cam profile and select one among them [10,11] depending on engine operating conditions. These systems seek to reduce the impact of the traditional fixed valve timing compromise, which penalizes low volumetric efficiency versus high speed and low speed combustion stability.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Analysis of Electromagnetic Variable Valve Timing Control Systems for Improvement of Spark Ignition Engine Performance

A¹

2014

Adv Automob Eng

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The objective of this paper is to meet the requirements of higher torque values at all engine speeds. This can be achieved by varying the valve timing automatically using a new variable valve timing system (VVT), which gives continuously variable valve actuation at all engine speeds. A model engine is designed using dimensional analysis methods and then implemented to verify the proposed control system. Moreover, microcontroller and computeraided control systems are constructed and used to modify the variable valve timing control in the laboratory. In this paper, a mathematical model of variable valve timing is developed to obtain the best volumetric efficiency with optimum valve timing at different engine speeds. From this model, the look-up table is created at all ranges of the engine speed. A single cylinder engine is used to estimate engine performance characteristics for conventional camshaft. In addition, a model engine is designed and constructed to apply the Variable Valve Timing control system. The investigations show that the system is flexible throughout the entire range of operation speeds and is able to alter valve timing concerning both valve opening and closing. The ability of valve opening and closing can be realized with rates higher than these of the conventional timing mechanisms.

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Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Analysis of Electromagnetic Variable Valve Timing Control Systems for Improvement of Spark Ignition Engine Performance

A¹

2014

Adv Automob Eng

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“…A clean sheet approach was taken in designing an engine specifically for SAE's student Formula race-car competition. From the onset, an open deck design was an obvious choice for the cylinder block due to its well published advantages in cooling and end-gas knock avoidance [1,2,3]. The design brief featured high pressure ratio turbocharging, with maximum values predicted to reach 2.8 at mid range speeds [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

Design and Development of a Gasketless Cylinder Head / Block Interface for an Open Deck, Multi Cylinder, Highly Turbocharged Small Engine

Attard

Watson

Stryker

2006

SAE Technical Paper Series

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This paper describes the design and development of a gasketless interface, which was used successfully to couple an aluminium cylinder head to an open deck design cylinder block. The cylinder block was manufactured from aluminium, featuring shrink fit dry cast iron liners. Extensive CAE modelling was employed to implement the gasketless interface and thus avoid using a conventional metal or fiber based cylinder head gasket. The engine was specifically designed and configured for the purpose, being a 430 cm 3 , highly turbocharged (TC) twin cylinder in-line arrangement with double overhead camshafts and four valves per cylinder. Most of the engine components were specially cast or machined from billets. The new design removed the conventional head gasket and relied on the correct amount of face pressure generated by interference between the cylinder head and block to seal the interface. This had advantages in improving the structural integrity of the weak open deck design. Extensive FEM analysis determined the correct amount of interference needed for successful operation under all operating conditions. Extensive thermal analysis concluded that removing the conventional gasket had the advantage of improving the heat path between the cylinder head and block, as the gasket behaves as an insulator. The possibility of gasket failure due to abnormal combustion is also eliminated. The design proved successful in operation, withstanding knock amplitudes of 30 bar, in-cylinder pressures exceeding 100 bar and high combustion temperatures. The engine completed extensive static and transient testing with no interface problems after initial development, recording 25 bar brake mean effective pressure (BMEP) on pump gasoline.

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Adaptation of a Dual Continuous Variable Cam Phasing System to a 4-Valve, 4-Cylinder Engine - Thermodynamic Benefits and Engine Hardware Requirements

Cited by 2 publications

References 5 publications

Theoretical and Experimental Analysis of Electromagnetic Variable Valve Timing Control Systems for Improvement of Spark Ignition Engine Performance

Theoretical and Experimental Analysis of Electromagnetic Variable Valve Timing Control Systems for Improvement of Spark Ignition Engine Performance

Design and Development of a Gasketless Cylinder Head / Block Interface for an Open Deck, Multi Cylinder, Highly Turbocharged Small Engine

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