Development Work on the Synthesis of a Variable Stroke Slider-Crank Mechanism for a Variable Compression Ratio Combustion Engine 2021-01-0653
The subject of control of compression and stroke in engines is still a very contemporary research topic, and there is room for research in this matter, as can be asserted from the literature reviewed. In this paper, we report on the systematic methodology followed to perform the synthesis of a variable displacement slider-crank mechanism, needed to convert a non-road small commercial reciprocating single cylinder diesel engine to a variable compression ratio (VCR) engine for academic research purposes. Preliminary dimensions and space trajectories of the projected variable stroke multilink mechanism, constrained by the design of the base engine, were obtained using the coupler curves of Hrones and Nelson’s atlas. A genetic algorithm methodology was implemented to optimize the mechanism performance, as well as to give advantageous compression ratio and displacement behavior, according to both dimensional and kinematic fitness-criteria. A six links Stephenson structure was argued, as the base for a multilink variable stroke slider-crank mechanism, to alter the piston position and stroke variation ranges. With the obtained synthesized mechanism installed in the structure of the base engine, the compression ratio would be varied between 10 and 17.5, at the time that the actual range of piston displacement would be extended in a range between 23 and 38 %. The work conducted is part of a research under work, which pursues to construct the VCR multilink mechanism to install in the available engine.
Citation: Henao Castañeda, E., Romero, C., and Quintero, H., "Development Work on the Synthesis of a Variable Stroke Slider-Crank Mechanism for a Variable Compression Ratio Combustion Engine," SAE Technical Paper 2021-01-0653, 2021, https://doi.org/10.4271/2021-01-0653. Download Citation
Author(s):
Edison de Jesús Henao Castañeda, Carlos Alberto Romero, Hector Fabio Quintero
Affiliated:
Universidad Tecnologica de Pereira
Pages: 10
Event:
SAE WCX Digital Summit
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Variable compression ratio engines
Diesel / compression ignition engines
Product development
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