Increasing the Theoretical Efficiency of The Spark-Ignition Engine Cycle by Adding Inert Gas at Part-Load

Abstract A thermodynamic cycle simulation was developed for a spark-ignition engine which included the use of multiple zones for the combustion process. This simulation was used to complete analyses for a commercial, spark-ignition V-8 engine operating at a part load condition. Specifically, the engine possessed a compression ratio of 8.1:1, and had a bore and stroke of 101.6 and 88.4 mm, respectively. A part load operating condition at 1400 rpm with an equivalence ratio of 1.0 was examined. Results were obtained for overall engine performance, for detailed in-cylinder events, and for the thermodynamics of the individual processes. In particular, the characteristics of the engine operation with respect to the combustion process were examined. Implications of the multiple zones formulation for the combustion process are described.

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Intake Port Phenomena in a Spark-Ignition Engine at Part Load

10.4271/912401 ◽

1991 ◽

Cited By ~ 33

Author(s):

Chun-On Cheng ◽

Wai K. Cheng ◽

John B. Heywood ◽

Damien Maroteaux ◽

Nick Collings

Keyword(s):

Spark Ignition ◽

Spark Ignition Engine ◽

Intake Port ◽

Part Load

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Part-load performance and emissions of a spark ignition engine fueled with RON95 and RON97 gasoline: Technical viewpoint on Malaysia’s fuel price debate

Energy Conversion and Management ◽

10.1016/j.enconman.2014.09.008 ◽

2014 ◽

Vol 88 ◽

pp. 928-935 ◽

Cited By ~ 25

Author(s):

Taib Iskandar Mohamad ◽

Heoy Geok How

Keyword(s):

Spark Ignition ◽

Spark Ignition Engine ◽

Fuel Price ◽

Part Load ◽

Performance And Emissions

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

Archives of Thermodynamics ◽

10.2478/aoter-2014-0029 ◽

2014 ◽

Vol 35 (3) ◽

pp. 191-205 ◽

Cited By ~ 1

Author(s):

Zbigniew Żmudka ◽

Stefan Postrzednik ◽

Grzegorz Przybyła

Keyword(s):

Charge Exchange ◽

Flow Resistance ◽

Spark Ignition ◽

Spark Ignition Engine ◽

Miller Cycle ◽

Inlet Valve ◽

Engine Operation ◽

Engine Load ◽

Part Load ◽

Valve Control

Abstract 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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