Complex piston contour machining using a Digital Cam system

Yuan Chuan Wang*, An-Chen Lee, Long Chin Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In this paper, a Digital Cam system has been developed to flexibly machine complex piston contours, including the geometrical tolerance measured on the circumferential contour (ovality), the tolerances measured on the axial profile (taper and barrelling) and pads on both the thrust and nonthrust sides of piston skirts. The Digital Cam is driven by an electro-hydraulic servovalve and is controlled by computer programs. Different piston contours can be flexibly machined by just changing computer-stored profiles instead of using many dedicated and expensive master cams. The ARMAV bivariate time series modelling technique and a minimum variance control algorithm are used to design an effective linear minimum-variance (MINIVAR) digital controller to control the cam motion of the Digital Cam. By using computer simulations, the performance of the MINIVAR controller was first studied, and it showed a good input-tracking and adaptability.

Original languageEnglish
Pages (from-to)361-370
Number of pages10
JournalChung-Kuo Chi Hsueh Kung Ch'eng Hsueh Pao/Journal of the Chinese Society of Mechanical Engineers
Issue number5
StatePublished - 1 Oct 1988

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