CAM DESIGN AND MANUFACTURING FOR A HOMOGENEOUS CHARGE COMPRESSION IGNITION GASOLINE ENGINE

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In this study, cams were designed and manufactured for a homogenous charge compression ignition (HCCI) gasoline engine. Low lift cams were designed accordance with HCCI combustion characteristics for 38 mm base circular diameter, 124° dwell angle, 3.5, 5.5 and 7.5 mm valve lifts. Generic geometric models of cam profiles were obtained using circular arc curves. Obtained models were fitted with fourier series and circular arc curve was derived from the corresponding equations. Speed, acceleration and jerk effects of the follower were investigated for designed cam profiles. Obtained results were compared with cams obtained by 5th degree classical spline method. It has been shown that feature a single point of contact of cam into the follower has been lost and acceleration and jerk values of the follower increased so much as long as valve lift increase in the cam profiles obtained by classical spline functions. It has been shown that feature a single point of contact of cam into the follower has not been lost by fitting fourier series of obtained geometric model of cam profile even high valve lifts. Friction and inertia forces decreased due to the low speed and acceleration operation.

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HCCI combustion , cam design , three circular arc curve , fourier series , spline method

Journal Of The Faculty Of Engineering an‎d Architecture Of Gazi University

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Journal Of The Faculty Of Engineering an‎d Architecture Of Gazi University