Patent · US Expired

Apparatus and methods for controlling idling speed of an internal combustion engine by reducing torque fluctuations

US6085723A · kind A · utility

34Cited by

11References

21Claims

0Family size

Assignee

ISAD Electronic Systems GmbH & Co., KG · DE

Inventors

Thomas Pels · Achern, DE
Klaus Revermann · Schwerinsdorf, DE
Klaus-Peter Zeyen · Recklinghausen, DE

Key dates

Filing date	Sep 3, 1999
Grant date	Jul 11, 2000
Priority date	—
Expiry date	Sep 3, 2019

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02B75/06
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.