Modeling of Non-ideal Variable Pitch Valve Springs for Use in Automotive Cam Optimization

Henry Yau () and Richard W. Longman ()
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Henry Yau: Columbia University
Richard W. Longman: Columbia University

A chapter in Modeling, Simulation and Optimization of Complex Processes, 2012, pp 325-337 from Springer

Abstract: Abstract Optimal control theory has been studied for use in developing valve trains in engines to minimize vibration and wear. Previous works have concentrated on the optimization of the cam lobe profile using an ideal linear spring model for the valve spring. The ideal linear spring model cannot capture the variations in spring stiffness that occur at high speeds due to the internal spring dynamics. By using a multiple-mass lumped-parameter spring, greater accuracy may be obtained in simulation. In addition, such a model allows for the introduction of spring pitch to be included as an additional optimization parameter. In this paper, a simple multi-mass variable pitch spring model is developed to be used in valve pitch optimization as well as cam profile optimization.

Keywords: Contact Force; Optimal Control Theory; Spring Stiffness; Variable Pitch; Spring Coil (search for similar items in EconPapers)
Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-3-642-25707-0_27

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DOI: 10.1007/978-3-642-25707-0_27

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