Development of an Optimum Variable-Stroke Internal-Combustion Engine Mechanism From the Viewpoint of Kinematic Structure

Freudenstein, F.; Maki, E. R.

doi:10.1115/1.3258519

Cited by 58 publications

(46 citation statements)

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“…Beginning in the mid-1960s, the abstract representation of kinematic structure was investigated with the aid of graph theory first by Freudenstein and Maki [14,15]. This procedure is based on the separation of the mechanism structure from its function.…”

Section: Graph Theorymentioning

confidence: 99%

Conceptual design of mechanisms based on computational synthesis and simulation of kinematic building blocks

Kota

Chiou

1992

Research in Engineering Design

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Although many ingenious mechanisms have been designed, the fundamental task of conceptualizing these devices is, to a great extent, still an art. While sophisticated computational tools for dynamic analysis of mechanisms exist, hardly any computational methods exist for generalized synthesis. To develop a computational model for synthesis, a formal foundation for mechanisms design must be laid by rationalizing the process of mechanical synthesis. Rationalization in synthesis implies that complex mechanical motions can be described in terms of primitives or building blocks. In this paper, we present a matrix methodology that forms the basis for a computable approach to design synthesis. In this methodology, the continuous design space of a mechanisms domain is discretized into functional subspaces, and each subspace is represented uniquely by a conceptual building block. The matrix scheme serves as a formal means to (a) represent and reason with the building blocks at different levels of abstraction, (b) generate alternate conceptual design configurations, and (c) facilitate rapid simulation of design concepts by connecting a series of building blocks.

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Section: Graph Theorymentioning

confidence: 99%

Conceptual design of mechanisms based on computational synthesis and simulation of kinematic building blocks

Kota

Chiou

1992

Research in Engineering Design

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“…By continuously changing the compression ratio, an engine enables optimum combustion efficiency at all engine speed and load conditions, realizing better engine performance, lower fuel consumption, and lower exhaust emissions. Variable stroke and consequently variable displacement is also a desired feature [8,9,10,11,12,13]. For fixed displacement engines, the load variation is usually handled by throttling the intake air.…”

Section: Introductionmentioning

confidence: 99%

Geometric Parameter Design of a Multiple-Link Mechanism for Advantageous Compression Ratio and Displacement Characteristics

Jiang

Smith

2014

SAE Technical Paper Series

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Variable compression ratio and variable displacement technologies are adopted in internal combustion engines because these features provide further degrees of freedom to optimize engine performance for various operating conditions. This paper focuses on a multiple-link mechanism that realizes variable compression ratio and displacement by varying the piston motion, specifically the Top Dead Center (TDC) and Bottom Dead Center (BDC) positions relative to the crankshaft. It is determined that a major requirement for the design of this mechanism is when the control action changes monotonically over its whole range, the compression ratio and the displacement should change in opposite directions monotonically. This paper presents an approach on how to achieve multiple-link mechanism geometric designs that fulfill this requirement. First, a necessary and sufficient condition, and a stronger sufficient condition are obtained on how the TDC and BDC positions should change with respect to the control action to fulfill the design requirement. Then Design of Experiments (DoE) methodology is used for creating sets of geometric designs of the mechanism, for which kinematics are calculated and checked against the conditions. A feasible design that satisfies the conditions is selected and detailed study on such characteristics as piston motion, stroke length, displacement, combustion chamber volume, and compression ratio etc. is performed. The design approach and obtained results serve as a basis for further analysis and optimization of the multiple-link mechanism.

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“…Recently, however, there has been considerable interest in the creation of mechanisms in a systematic manner [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. A promising approach is to separate the structure of a mechanism from its function.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, each kinematic structure obtained is sketched and evaluated according to the functional requirements of a mechanism [14]. This method of synthesis has been successfully applied to the creation of variable-stroke mechanisms by Freudstein and Maki [15,16].…”

Section: Introductionmentioning

confidence: 99%

An Application of the Linkage Characteristic Polynomial to the Topological Synthesis of Epicyclic Gear Trains

Tsai

1987

Journal of Mechanisms, Transmissions, and Automation in Design

124

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In this paper, a random number technique for computing the value of a linkage characteristic polynomial is shown to be an effective method for identifying isomorphic graphs. The technique has been applied to the topological synthesis of onedegree-of-freedon, epicyclic gear trains with up to six links. All the permissible graphs of epicyclic gear trains were generated by a systematic procedure, and the isomorphic graphs were identified by comparing the values of their corresponding linkage characteristic polynomials. It is shown that there are 26 nonisomorphic rotation graphs and 80 displacement nonisomorphic graphs from which all the six-link, one-degree-of-freedom, epicyclic gear trains can be derived.

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Development of an Optimum Variable-Stroke Internal-Combustion Engine Mechanism From the Viewpoint of Kinematic Structure

Cited by 58 publications

References 0 publications

Conceptual design of mechanisms based on computational synthesis and simulation of kinematic building blocks

Conceptual design of mechanisms based on computational synthesis and simulation of kinematic building blocks

Geometric Parameter Design of a Multiple-Link Mechanism for Advantageous Compression Ratio and Displacement Characteristics

An Application of the Linkage Characteristic Polynomial to the Topological Synthesis of Epicyclic Gear Trains

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