Variable cam engine
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United States of America Patent
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Mar 23, 1993
Grant Date -
N/A
app pub date -
Nov 26, 1991
filing date -
Nov 26, 1990
priority date (Note) -
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Abstract
A variable cam engine wherein each cylinder has at least one valve driven by a multiplicity of cams which give different engine torque outputs. The engine includes a decision-making device which decides change-over of the cams along with a selection of a target cam according to the engine running conditions, a cam change-over mechanism which disengages a current cam from the valve and engages the target cam instead, a measuring device to measure engine parameters having a correlation with the cam change-over, a determining device to determine that a cam change-over has occurred by comparing these parameters with previously set values, and a regulating device which regulates combustion in the corresponding cylinder according to the cam change-over determined by the determining device. The fuel supply quantity and ignition period corresponding to the cam which is actually selected are thereby regulated for each cylinder, a torque step due to the cam change-over is avoided so that the change-over takes place smoothly, and degradation of the exhaust gas composition is prevented.
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