Apparatus and methods for controlling idling speed of an internal combustion engine by reducing torque fluctuations
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United States of America Patent
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Jul 11, 2000
Issued Date -
N/A
app pub date -
Sep 3, 1999
filing date -
Mar 6, 1997
priority date (Note) -
Expired
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Abstract
Apparatus and methods are disclosed for controlling the idling speed of an internal combustion engine by reducing torque fluctuations experienced by the engine. In the disclosed apparatus, an electric machine is coupled to the drive shaft of an internal combustion engine. The electric machine is controlled such that it applies a varying torque substantially in counterphase to the torque fluctuations to reduce such fluctuations. The amplitude of the torque variations applied by the electric machine in the cold state of the internal combustion engine are greater than in the warm state. An idle control system functions to maintain the reference idling speed of the internal combustion engine in the cold state below or at the same level set in the warm state. The reference idling speed can be reduced relative to the idling speeds set in prior art systems to achieve enhanced engine performance.
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