Method and device for variable valve control of an internal combustion engine
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United States of America Patent
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Jan 14, 1997
Grant Date -
N/A
app pub date -
Mar 3, 1995
filing date -
Jul 6, 1993
priority date (Note) -
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Abstract
A method and a device for the variable control of a valve of an internal combustion engine, in particular for a throttlefree load control of an Otto carburetor engine via a lift function of one or several intake valves per cylinder are presented. Thereby the cams of two camshafts which normally rotate at the same speed are followed by a feeler-device in the manner of an adder and the movement of the feeler-device is transferred to an actuating device for actuating the valve. The cams of one of the camshafts which operates as the opening camshaft is provided with a flat section and a lobe which pass into each other via an opening portion. The cam of the other one of the camshafts which operates as the closing camshaft is provided with a lobe and a flat section which pass into each other via a closing portion. For altering the lift and/or opening duration of the valve the phase relationship between the camshafts is changeable. The feeler-device is, after the closing of the valve, held in contact with the cam of only one of the camshafts, and through this the actuating device is held in contact with the valve. The cam of the other camshaft gets out of contact with the feeler device after the closing of the valve and at the beginning of opening of the valve again gets into contact with the feeler device.
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