Electro-hydraulic fully variable valve train system

Haas, Michael; Rauch, Martin

doi:10.1007/bf03227946

Cited by 12 publications

(9 citation statements)

References 1 publication

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“…Investigations on variable valve actuation are conducted by many scientific as well as research and development centres [6][7][8][10][11][12]. This justifies the importance of the presented problem within which the theoretical research on the systems with independent inlet valve control has been conducted.…”

Section: E0mentioning

confidence: 90%

Realization of the Atkinson-Miller cycle in spark-ignition engine by means of the fully variable inlet valve control system

Żmudka¹,

Postrzednik²,

Przybyła³

2014

Archives of Thermodynamics

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The theoretical analysis of the charge exchange process in a spark ignition engine has been presented. This process has significant impact on the effectiveness of engine operation because it is related to the necessity of overcoming the flow resistance, followed by the necessity of doing a work, so-called the charge exchange work. The flow resistance caused by the throttling valve is especially high during the part load operation. The open Atkinson-Miller cycle has been assumed as a model of processes taking place in the engine. Using fully variable inlet valve timing the A-M cycle can be realized according to two systems: system with late inlet valve closing and system with early inlet valve closing. The systems have been analysed individually and comparatively with the open Seiliger-Sabathe cycle which is a theoretical cycle for the classical throttle governing of the engine load. Benefits resulting from application of the systems with independent inlet valve control have been assessed on the basis of the selected parameters: fuel dose, cycle work, charge exchange work and a cycle efficiency. The use of the analysed systems to governing of the SI engine load will enable to eliminate a throttling valve from the system inlet and reduce the charge exchange work, especially within the range of part load operation.

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Section: E0mentioning

confidence: 90%

Realization of the Atkinson-Miller cycle in spark-ignition engine by means of the fully variable inlet valve control system

Żmudka¹,

Postrzednik²,

Przybyła³

2014

Archives of Thermodynamics

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“…The EEVC system enables, among other things, realization of an internal exhaust gas recirculation. EGR ratio αr is defined by formula [9,10]:…”

Section: The Open Theoretical Cycle Of the System With Early Inletmentioning

confidence: 99%

“…Electromagnetic and electro-hydraulic valve actuation systems for a camless engine are the most advanced and promising [4,10,12,13,14]. FIAT is mass-producing the first fully variable intake valve train, which is based on electro-hydraulic valve drive [2,8,9]. The variable valve drive is one of the key technologies for fuel consumption reduction, low CO2 emission and increase of the effective efficiency and torque especially in the lower speed range.…”

Section: Introductionmentioning

confidence: 99%

Energy Aspects of the Si Engine Load Adjustment by Early Closing of Inlet or Exhaust Valve

Żmudka

Postrzednik

Przybyła

2016

Journal of KONES. Powertrain and Transport

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The theoretical analysis of the SI engine load adjustment has been presented. The load especially in SI engine is highly dependent on the process of charge exchange. This process has significant impact on the effectiveness of an engine work because it is connected with the necessity of overcoming the flow resistance, then with the necessity of doing a work, so-called the charge exchange work. The flow resistance caused by throttling valve is especially high during part load operation. The open theoretical cycle has been assumed as a model of processes proceeding in the engine. Using fully variable inlet and exhaust valves timing the cycle can be realized e.g. according to two systems: system with early inlet valve closing (EIVC) and system with early exhaust valve closing (EEVC). Both systems have been analysed individually and comparatively with the open Seiliger-Sabathe cycle, which is theoretical cycle for the classical throttle governing of an engine load. Benefits resulting from application of the systems with independent inlet and exhaust valves control have been assessed on the basis of the selected parameters: a fuel dose, a cycle work, a charge exchange work and a cycle efficiency. The use of the analysed systems to governing of the SI engine load will enable to eliminate a throttling valve from inlet system and reduce the charge exchange work, especially within the range of part load operation. Decrease of the charge exchange work leads to increase of the internal and effective works, which results in increase of the effective efficiency of the spark ignition engine. Additionally, the EEVC enables realization of the internal EGR.

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“…The most flexible solution for independent control of the valves is to use electromagnetic actuators but they are still under construction and are not in mass production because of electro-mechanical problems [6,7]. However, currently the most advanced solution is an electro-hydraulic system [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Throttleless control of SI engine load by fully flexible inlet valve actuation system

2016

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A system with independent, early inlet valve closure (EIVC) has been analysed. The open, theoretical cycle has been assumed as a model of processes proceeding in the engine with variable inlet valve actuation. The system has been analysed individually and comparatively with open Seiliger-Sabathe cycle which is theoretical cycle for the classic throttle governing of engine load. The influence of EIVC on fuel economy, cycle work, relative charge exchange work and cycle efficiency has been theoretically investigated. The use of the analysed system to governing of an engine load will enable to eliminate a throttling valve from inlet system and reduce the charge exchange work, especially within the range of partial load. The decrease of the charge exchange work leads to an increase of the internal and effective works, which results in an increase of the effective efficiency of the spark ignition engine.

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Electro-hydraulic fully variable valve train system

Cited by 12 publications

References 1 publication

Realization of the Atkinson-Miller cycle in spark-ignition engine by means of the fully variable inlet valve control system

Realization of the Atkinson-Miller cycle in spark-ignition engine by means of the fully variable inlet valve control system

Energy Aspects of the Si Engine Load Adjustment by Early Closing of Inlet or Exhaust Valve

Throttleless control of SI engine load by fully flexible inlet valve actuation system

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