VR/LE Engine with a Variable R/L during a Single Cycle

Rychter, T.; Teodorczyk, A.

doi:10.4271/850206

Cited by 15 publications

(4 citation statements)

References 7 publications

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“…Additionally, the mechanism provides possibility of change in compression ratio. The conception is similar to solution proposed by Rychter and Teodorczyk [5,6]. Their mechanism called the VR/VL uses variable crank to rod length ratio to change the compression ratio outside the engine.…”

Section: Rocker Engine Descriptionmentioning

confidence: 94%

New Concept of a Rocker Engine –– Kinematic Analysis

Szymkowiak¹,

Szwaja²

2015

Journal of KONES. Powertrain and Transport

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The paper presents concept and design of a four-stroke 4-cylinder internal combustion engine consisted of a single connecting rod to a crankshaft and four additional rods joining pistons with a rocker. The rocker is a specific element in the engine construction that makes this engine different from the typical reciprocating internal combustion piston engine. Furthermore, kinematical analysis of this piston -rocker -crankshaft mechanism was conducted. As concluded from the analysis, this mechanism implemented to the engine, provides several advantages with respect to both dynamic and thermodynamic related issues. First of all, a profile of the piston motion can be easily changed with change in the mechanism geometry e.g. major dimensions of connecting rods, the rocker etc. Thus, the piston motion profile can be asymmetrical with slow motion to and relatively fast distancing from the TDC. This feature can be useful in reducing thermal losses to an engine cooling system. Additionally, the mechanism characterizes itself with low transverse force from the piston, which acts on a cylinder liner. As a result, it significantly reduces frictional losses and should increase the overall efficiency of the engine. Among disadvantages, higher inertial forces are the most important problem. As analyzed, the rocker is the main component that contributes to increase in inertial forces by approximately three to four times. On the other hand, total inertia forces, due to specific kinematical chain of the mechanism, can be remarkably reduced in case the mechanism is correctly optimized.

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Section: Rocker Engine Descriptionmentioning

confidence: 94%

New Concept of a Rocker Engine –– Kinematic Analysis

Szymkowiak¹,

Szwaja²

2015

Journal of KONES. Powertrain and Transport

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“…That means that the direction of changes in the rate of in-cylinder pressure increase is consistent with the direction of changes in the energy potential of the applied type of feeding fuel. The second component of the right-hand side of equation ( 4) characterizes the work of compression performed by the thermodynamic system, which can be proved using the general isentrope equation [10,12].…”

Section: A Rate Of the In-cylinder Pressure Increasementioning

confidence: 99%

Research on the effect of low-sulphur marine fuels on the dynamic characteristics of a CI engine

Korczewski¹

2023

Combustion Engines

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The implementation of low-sulphur, so-called modified marine fuels into operation requires prior laboratory engine tests to assess the energy, emission and structural effects of their usage. This type of research are carried out on the test bed of a diesel engine as a small-scale physical model that reproduces the adequate design and process (parametric) features of a full-size marine engine. Their key stage is to determine the energy characteristics of the engine in the steady state of operation determined on the basis of the analysis of the developed indicator diagram and the dynamic characteristics of the transient processes from idling to the reference steady state of load - and vice versa. In this way, the basic diagnostic parameters of the fuel usable quality are determined: the rate of pressure increase in the cylinder and the average deceleration of the engine crankshaft within the strenuous transient process. This article presents representative results of this type of research carried out on six different, low-sulphur marine fuels used to feed marine engines.

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“…The piston stroke may be directly calculated using following equation: ment during engine work. The concept was analyzed for different relative rotational speeds between the crankshaft and eccentric rod [3][4][5]…”

Section: Fig 1 Stde Engine Schemementioning

confidence: 99%

The closed-cycle model numerical analysis of the impact of crank mechanism design on engine efficiency

2017

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The research presents a review and comparison of different engine constructions. Investigated engines included crankshaft engines, barrel engine, opposed-piston engines and theoretical models to present possible variations of piston motion curves. The work comprises also detailed description of a numerical piston engine model which was created to determine the impact of the cycle parameters including described different piston motion curves on the engine efficiency. Developed model was equipped with Wiebe function to reflect a heat release during combustion event and Woschini’s correlation to simulate heat transfer between the gas and engine components.Various scenarios of selected engine constructions and different working conditions have been simulated and compared. Based on the results it was possible to determine the impact of different piston motion curves on the engine cycle process and present potential efficiency benefits.

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VR/LE Engine with a Variable R/L during a Single Cycle

Cited by 15 publications

References 7 publications

New Concept of a Rocker Engine –– Kinematic Analysis

New Concept of a Rocker Engine –– Kinematic Analysis

Research on the effect of low-sulphur marine fuels on the dynamic characteristics of a CI engine

The closed-cycle model numerical analysis of the impact of crank mechanism design on engine efficiency

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