Kinematics of a variable stroke and compression ratio mechanism of an internal combustion engine

Rufino, Caio Henrique; Ferreira, Janito Vaqueiro

doi:10.1007/s40430-018-1396-x

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…The simulated engine consists of the mechanism described in Rufino and Ferreira, 13 that is, a naturally aspirated spark-ignition engine with port-fuel injection. Properties of anhydrous ethanol are given in Table 2.…”

Section: Characteristics Of the Simulated Enginementioning

confidence: 99%

“…[10][11][12] Therefore, the authors developed a new technology involving the addition of a lever between the connecting rod and piston; this allows the piston kinematics to be controlled by the position of the lever's pivot. 13 By controlling piston kinematics, the position of top dead centre (TDC) can be regulated, thus controlling both the compression ratio and the displacement. A schematic of the specific mechanism studied herein is presented in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Study on the efficiency of a spark-ignition variable displacement and compression ratio engine

Rufino

Ferreira

2020

International Journal of Engine Research

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A variable stroke engine was proposed as a promising solution for improving the efficiency of flex-fuel engines by adjusting the compression ratio; this prevents knock onset for fuels with different octane numbers. Similarly, the displacement was adjusted by varying stroke length with the objective of mitigating cylinder pumping losses. This article compares the efficiency of a spark-ignition, port-fuel injection engine, with variable displacements and compression ratios; a conventional engine with a fixed compression ratio; and an engine with variable compression ratios. A simulation-based calibration was performed for each engine, using the results from a phenomenological model to predict the engine performance. The calibration maps were obtained by maximising efficiency through determining the optimal combination of available engine parameters such as spark timing, compression ratio, displacement, and throttle actuation. A comparison of the efficiencies of the different types of engines showed an improvement of approximately 15% for the engine under partial load conditions and with variable displacement and compression ratio, compared to a conventional engine.

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Section: Characteristics Of the Simulated Enginementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the efficiency of a spark-ignition variable displacement and compression ratio engine

Rufino

Ferreira

2020

International Journal of Engine Research

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“…Khader 12 proposed the design nomograms for directly designing the crank-rocker mechanism links’ ratios with a definite determined transmission angle limit. Rufino and Ferreira 13 described a variable stroke mechanism and presented a kinematic model to determine the requirements for synthesis of the mechanism. El-Shakeryet al 14 suggested both analytical and graphical methodologies to optimally determine links’ lengths of crank-rocker four-bar linkage to obtain a targeted design with definite transmission angle.…”

Section: Introductionmentioning

confidence: 99%

Optimal synthesis of crank-rocker mechanisms with optimum transmission angle for desired stroke and time-ratio using genetic programming

Ahmadi

2022

Advances in Mechanical Engineering

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Dimensional synthesis of crank-rocker mechanisms applied to provide some desired values of stroke and time ratio, is of utmost importance for designing an efficient mechanism. In the synthesis and manufacturing of crank-rocker mechanisms, the designers are further challenged by other design criteria, such as quality of motion. In this study, a novel approach based on genetic programming (GP) is proposed for dimensional synthesis of planar crank-rocker mechanisms with optimum transmission angle over the desired stroke and time-ratio. An analytical approach is elaborated which leads to an interesting relationship of length of the coupler and rocker links. It is, therefore, advised that by adopting equal lengths for coupler link and rocker link, one can guarantee the optimality of the transmission angle’s deviation ([Formula: see text]), ensuring the Grashof condition. Consequently, through an inverse modeling approach, GP method is utilized to construct some explicitly mathematical formulas to represent all the sizes and dimensions of the crank-rocker mechanism based on the any desired values of both stroke and time-ratio. In this way, an input-output data set consisting of all the dimensions and the sizes of the links as the input variables and both the stroke and time-ratio as output variables is first constructed using the pertinent mathematical equations. Indeed, such approach of inverse modeling using GP simplifies greatly the synthesis of the crack-rocker mechanisms for any desired values of both stroke and time-ratio. The proposed approach has been applied for kinematic synthesis of a crank-rocker mechanism. A comparison between the obtained results of this work and the analytic method, clearly illustrates the efficiency of the proposed approach.

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“…Khader 15 proposed the design nomograms for directly designing the crank-rocker mechanism links’ ratios with a definite synthesized transmission angle range. Rufino and Ferreira 16 described a variable stroke mechanism and presented a kinematic model to determine the requirements for synthesis of the mechanism. El-Shakery et al 17 suggested both analytical and graphical methodologies to optimally synthesize links’ lengths of crank-rocker four-bar mechanism to achieve a targeted design with definite transmission angle.…”

Section: Introductionmentioning

confidence: 99%

An analytical game-based design of crank-rocker mechanisms with optimum stroke, time ratio and transmission angle

Ahmadi

Nezamivand

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this study, an analytical approach based on bi-level multi-objective game theory is proposed and implemented for dimensional synthesis of the planar crank-rocker four-bar mechanisms. Two players, namely, Stroke ([Formula: see text]) and Time Ratio ([Formula: see text]) are considered in the level playing the role of a leader. The third player, Transmission Angle ([Formula: see text]), is placed in a lower level operating with the role of the follower’ role. Players’ behavior at upper level is also modeled as a cooperative game. In addition to this, the interaction between upper and lower levels is modeled as a Stackelberg game wherein an analytical approach is given to provide an explicit function of the follower’s Rational Reaction Set (RRS). Such analytical approach of Stackelberg game theory leads to an interesting relationship of length of the coupler and rocker links. It is, therefore, advised that by adopting equal lengths for coupler link and rocker link, one can guaranty the optimality of the transmission angle deviation, ensuring the Grashof condition. Consequently, the stroke, time ratio, and transmission angle criteria are derived explicitly as mathematical functions explaining the links of mechanism’s normalized dimensions. The aforementioned approach coupled with the proposed formulas and charts, greatly simplifies the synthesis of the mechanisms with optimal transmission angle while adopting any desired values of both stroke and time ratio. The theoretical approach proposed are explained with illustrated examples.

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Kinematics of a variable stroke and compression ratio mechanism of an internal combustion engine

Cited by 5 publications

References 5 publications

Study on the efficiency of a spark-ignition variable displacement and compression ratio engine

Study on the efficiency of a spark-ignition variable displacement and compression ratio engine

Optimal synthesis of crank-rocker mechanisms with optimum transmission angle for desired stroke and time-ratio using genetic programming

An analytical game-based design of crank-rocker mechanisms with optimum stroke, time ratio and transmission angle

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