Method of and apparatus for operating a supercharger
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United States of America Patent
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Nov 1, 2016
Grant Date -
Nov 3, 2011
app pub date -
Mar 25, 2009
filing date -
Mar 25, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A method of and apparatus for operating a supercharger for an automotive engine is disclosed. The supercharger has: an input shaft for coupling to an engine crankshaft, and coupled to the rotor of a first electrical machine and a first component of an epicyclic gear train; and an output shaft connected to a compressor and a second component of the epicyclic gear train; wherein the third component of the epicyclic gear train is connected to the rotor of a second electrical machine. The first electrical machine is selectively operable to supply electrical energy to the second electrical machine. The method includes the steps of: (a) calculating a required speed of the second electrical machine that would give rise to a required pressure at an outlet of the compressor; and (b) setting the speed of the second electrical machine to the calculated required speed.
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