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Abstract

We present a methodology to design cams for motor engine valve trainsusing a constrained optimization algorithm. The imposed constraints arethe maximum valve lift and timings while the objective function is tomaximize the time integral of the valve area opened to gas flow. Apiecewise analytically defined acceleration is imposed, so that the timeinstants controlling the profile of accelerations are used as variablesfor optimization. The strategy takes into account some geometricalconstraints, e.g. to avoid interference between intake and exhaustvalves, and between valves and piston. Also, minimum and maximum levelsof acceleration are limited to avoid excessive forces in the mechanismschain, and to prevent the possibility of separation between cam andfollower. Once an optimal lift profile is determined, the cam shape iscomputed using an inverse kinematics analysis that takes into accountall the geometric nonlinearities introduced by the kinematical chain.Finally, the whole mechanism is verified in a dynamics analysis to checksatisfaction of the criteria for design. Comparisons with standardprofiles of motion were made. Also, the profile was evaluated in anexperimental device, where the actual valve displacement was measured.

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Cardona, A., Lens, E. & Nigro, N. Optimal Design of Cams. Multibody System Dynamics 7, 285–305 (2002). https://doi.org/10.1023/A:1015278213069

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  • DOI: https://doi.org/10.1023/A:1015278213069

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