Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)
- Volume 3 Issue 5
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- Pages.90-99
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- 1995
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- 1225-6382(pISSN)
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- 2234-0149(eISSN)
A Study on the Cam Profile Synthesis Method for Automotive Engines Using Hermite Curve
Hermite 곡선을 이용한 자동차 엔진 캠 형상 합성법에 관한 연구
Abstract
A numerical method is proposed to synthesize automotive cam profiles. An arbitrary acceleration profile for the cam follower motion is divided into several segments, each of them is described by a Hermite curve. A cam profile is defined by control point locations and control variables assigned to each segment. Closed form equations are derived for velocity and displacement constraints which should be satisfied for the curve to be a cam profile. Because the method is flexible and provide arbitrary local controllability, any types of cam acceleration profile can be reproduced by the method. The method is expecially useful for the design of roller type OHC valve trains which need precise local control in the cam profile design to avoid under-cutting problems.
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