Design and Control of a Two-stage Electro-hydraulic Valve Actuation System

Turner, Christopher W.; Babbitt, Guy; Balton, Christopher S.; Raimao, Miguel A.; Giordano, Daniel D.

doi:10.4271/2004-01-1265

Cited by 37 publications

(11 citation statements)

References 4 publications

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“…The documented studies of FVVA have, almost without exception, involved the development of fast response electro-hydraulic actuators which act upon conventional poppet valves [2,[10][11][12][13][14][15][16][17][18][19][20]. With the possible exception of Koenigsegg [20], such systems have failed to progress beyond the research stage despite intensive efforts to move them forward.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

DigitalAir^™ Camless FVVA System - Part 2, Gasoline Engine Performance Opportunities

Charlton¹,

Price²,

Rogers³

et al. 2017

SAE Int. J. Engines

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The paper describes a completely new approach to fully variable valve actuation (FVVA), which allows almost unlimited continuously variable control of intake and exhaust valve opening and closing events, and duration without the use of a camshaft. DigitalAir replaces conventional poppet valves with horizontally actuated valves located directly above the combustion deck of the cylinder head, which open and close a number of slots connecting the cylinder with the intake and exhaust ports, Figure 1. The stroke of the valves to provide the full flow area is approximately 25% of the stroke of the equivalent poppet valve, thus allowing direct electrical actuation with very low power consumption. This design arrangement also avoids the risk of poppet valve to piston collision, or the need for cutouts in the piston crown, since the valves do not open into the cylinder. The paper will present analytical and experimental data which confirms that the proposed FVVA system can meet the basic performance requirements of modern GDI engines with respect to breathing characteristics across the speed range, throttleless operation at and above idle, opening and closing event optimization, cylinder deactivation, control of residual gas fraction / scavenging and exhaust thermal management. Analytical results were developed using GT-POWER Cycle Simulation and CONVERGE computational fluid dynamics (CFD). Cycle simulation was used to study the system level performance, such as full load capability and transient response, and in particular to quantify the fuel consumption benefits of throttleless operation. CFD was used to better understand the opportunities for in-cylinder charge motiontumble, swirl and turbulence. JP SCOPE Inc. has been running experimental engines with DigitalAir for several years and has successfully completed performance and durability tests. The mechanical and thermal design of the cylinder head, and the design of the actuator will be covered in Part 1 of this paper [1].

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Section: Introductionmentioning

confidence: 99%

“…Turner and Babbitt et al [13] at Sturman Industries developed a twostage electro-hydraulic valve actuation system, shown in Figure 5. They had previously developed a single stage electro-hydraulic actuator and found limitations in the ability to control seating velocity over a wide range of engine speed and oil temperature / viscosity.…”

mentioning

confidence: 99%

DigitalAir^™ Camless FVVA System - Part 2, Gasoline Engine Performance Opportunities

Charlton¹,

Price²,

Rogers³

et al. 2017

SAE Int. J. Engines

View full text Add to dashboard Cite

show abstract

“…Fully Flexible Variable Valve Actuation (FFVVA) systems are capable of independent control over the valve lift, opening and closing timings, and duration. The FFVVA camless system can be either electromagnetic, electro-pneumatic or electrohydraulic and drive individual engine valves directly [3][4][5][6][7][8][9][10][11][12][13]. They offer more control freedom and improved engine performances and emissions.…”

Section: Introductionmentioning

confidence: 99%

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

Ojapah¹,

Zhang²,

Zhao³

2013

Internal Combustion Engines: Performance, Fuel Economy and Emissions

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“…These systems may include dual-independent cam phasing (DICP), sometimes in combination with variable valve lift and duration. A variety of variable valve lift/duration systems have been developed, including: 2-step or 3-step cam switching, continuously variable mechanical, electrohydraulic and electromechanical approaches [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Co-Simulation Analysis of Transient Response and Control for Engines with Variable Valvetrains

Sinnamon¹

2007

SAE Technical Paper Series

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Modern engines are becoming highly complex, with several strongly interactive subsystems-variable cam phasers on both intake and exhaust, along with various kinds of variable valve lift mechanisms. Isolated component models may not yield adequate information to deal with system-level interactive issues, especially when it comes to transient behavior. In addition, massive amounts of expensive experimental work will be required for optimization. Recent computing speed improvements are beginning to permit the use of cosimulation to couple highly detailed and accurate submodels of the various engine components, each created using the most appropriate available simulation package. This paper describes such a system model using GT-Power to model the engine, AMESim to model cam phasers and the engine lubrication system, and Matlab/Simulink to model the engine controllers and the vehicle. The simulation has been applied to examine fast transient response to throttle tip-in and tip-out maneuvers. After verifying the accuracy of the simulation against measured vehicle responses, various cam phaser control strategies were examined for their response to demand for engine torque and residual gas dilution. It was found that simple, conventional phaser control strategies such as position command using steady-state-based tables and phase-rate-limiting cannot provide sufficiently accurate dilution control. In order to extract the full fuel economy and emissions benefit from variable valvetrain systems, more accurate model-based control of residual gas fraction that is effective during fast transients is required. An approach to model-based dilution control is described and demonstrated.

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Design and Control of a Two-stage Electro-hydraulic Valve Actuation System

Cited by 37 publications

References 4 publications

DigitalAir^™ Camless FVVA System - Part 2, Gasoline Engine Performance Opportunities

DigitalAir^™ Camless FVVA System - Part 2, Gasoline Engine Performance Opportunities

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

Co-Simulation Analysis of Transient Response and Control for Engines with Variable Valvetrains

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Design and Control of a Two-stage Electro-hydraulic Valve Actuation System

Cited by 37 publications

References 4 publications

DigitalAir™ Camless FVVA System - Part 2, Gasoline Engine Performance Opportunities

DigitalAir™ Camless FVVA System - Part 2, Gasoline Engine Performance Opportunities

Part-load performance and emissions analysis of SI combustion with EIVC and throttled operation and CAI combustion

Co-Simulation Analysis of Transient Response and Control for Engines with Variable Valvetrains

Contact Info

Product

Resources

About

DigitalAir^™ Camless FVVA System - Part 2, Gasoline Engine Performance Opportunities

DigitalAir^™ Camless FVVA System - Part 2, Gasoline Engine Performance Opportunities