Variable cam engine
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United States of America Patent
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Sep 1, 1992
Grant Date -
N/A
app pub date -
Nov 21, 1991
filing date -
Nov 21, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
This invention relates to a variable cam engine of which each cylinder has at least one valve driven by multiplicity of cams which give different engine torque outputs. This invention provides an engine comprising 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 said target cam instead, a crank shaft angle sensor, a sequential control device which, when the cam change-over is made at an engine speed below a predetermined speed, actuates the cam change-over mechanism at predetermined intervals starting form a specific cylinder and proceeding in turn through the other cylinders, and a regulating device which regulates the combustion in each cylinder corresponding to the cam change-over. The fuel supply quantity and ignition period are thereby regulated according to the cam change-over for each cylinder, a torque step due to the cam change-over is prevented, and the cam change-over takes place smoothly.
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