Apparatus and methods for controlling idling speed of an interna

Details Apparatus and methods for controlling idling speed of an interna Apparatus and methods for controlling idling speed of an interna

1999-09-03

2000-07-11

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Idle speed control

1231921, 12333924, F02B 7506, F02D 4116

Patent

active

060857234

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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