Wyniki wyszukiwania - BazTech

1

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

Żmudka Z., Postrzednik S., Przybyła G.

Combustion Engines

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2016

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R. 55, nr 1

44--48

EN

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.

2

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

Żmudka Z., Postrzednik S., Przybyła G.

Archives of Thermodynamics

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2014

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Vol. 35, no. 3

191--205

EN

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.

3

Charge exchange control in a SI engine by early exhaust valve closing

Żmudka Z., Postrzednik S., Przybyła G.

Journal of KONES

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2013

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Vol. 20, No. 1

387--394

EN

The paper tackles the problems connected with the charge exchange in internal combustion engines. The theoretical analysis of the charge exchange process in the SI engine has been presented. A system with independent, early exhaust valve closing has been analysed. The analysed system enables realization of an internal EGR and elimination of a throttling valve from an 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. The open, theoretical cycle has been assumed as a model of processes proceeding in an engine. The system has been analysed individually and comparatively with open Seiliger-Sabathe cycle. Benefits resulting from application of the system with early exhaust valve closing have been assessed on the basis of the selected parameters: a fuel dose, a cycle work, a relative charge exchange work and a cycle efficiency. The best results within decrease of fuel consumption and increase of cycle efficiency are obtained for low engine load. The main parameters characterizing the process of the internal exhaust gas recirculation were also determined. These are the ratio and the multiplicity of the exhaust gas recirculation.

4

Late intake valve closing as a way of the throttleless control of SI engine load

Żmudka Z., Postrzednik S., Przybyła G.

Journal of KONES

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2012

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Vol. 19, No. 1

491-499

EN

The paper tackles the problems connected with the charge exchange in internal combustion engines. The theoretical analysis of the charge exchange process in the SI engine has been presented. The realization of the charge exchange process is connected with the necessity of overcoming the flow resistances, then with the necessity of doing a work, so-called the charge exchange work. The flow resistance caused by throttling valve is especially high at the partial load running of an engine. A system with independent, late intake valve closing has been analysed. 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. The open, theoretical Atkinson-Miller cycle has been assumed as a model of processes proceeding in the engine with variable intake 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. Benefits resulting from application of the system with late intake valve closing have been assessed on the basis of the selected parameters: a fuel dose, a cycle work, relative charge exchange work and cycle efficiency.

5

Niezależne sterowanie zaworami dolotowymi jako sposób realizacji otwartego obiegu Atkinsona-Millera w silniku ZI

Żmudka Z., Postrzednik S.

Silniki Spalinowe

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2011

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R. 50, nr 3

PL

Przeprowadzono analizę systemu z niezależnym, opóźnionym zamknięciem zaworu dolotowego, umożliwiającego wyeliminowanie przepustnicy z układu dolotowego silnika ZI. Jako model procesów zachodzących w silniku przyjęto otwarty obieg teoretyczny Atkinsona-Millera. Odniesieniem dla oceny korzyści oraz badania efektywności pozyskiwania pracy, w wyniku zastosowania systemu z opóźnionym zamknięciem zaworu dolotowego, jest otwarty obieg teoretyczny Seiligera-Sabathe'a z powszechnie stosowaną, klasyczną regulacją dławieniową obciążenia. Analizę porównawczą efektywności zastosowania zaproponowanego systemu przeprowadzono opierając się na wybranych wielkościach: dawce paliwa, parametrze energetyczno-stechiometrycznym, pracy obiegu, względnej pracy wymiany ładunku oraz sprawności obiegu.

EN

A system with independent, late inlet valve closing has been analysed. The use of the analysed system to governing of engine load will enable to eliminate a throttling valve from inlet system of a spark ignition engine. The open, theoretical Atkinson-Miller cycle has been assumed as a model of processes proceeding in an engine. The system has been analysed individually and comparatively with open Seiliger-Sabathe cycle. Benefits resulting from application of the system with late inlet valve closing have been assessed on the basis of the selected parameters: a fuel dose, a cycle work, a relative charge exchange work and a cycle efficiency.