Idle speed control system for engine

Details Idle speed control system for engine Idle speed control system for engine

1990-12-27

1991-11-19

Wolfe, Willis R.

Internal-combustion engines

Engine speed regulator

Idle speed control

F02D 4116

Patent

active

050657178

ABSTRACT:
An idle speed control system for an engine includes an idle regulator valve which controls the amount of intake air to be fed to the engine when the engine idles and a control unit which detects an engine speed and controls the opening of the idle regulator valve so that the detected engine speed converges on a target idle speed. The control unit calculates a basic air charging efficienty required to fixedly operate the engine at a target idle speed, calculates a first target air charging efficiency by feedback correction of the basic air charging efficiency on the basis of a correction value which is determined according to the difference between an actual idle speed and a target idle speed, calculates a second target air charging efficiency which is the air charging efficiency obtained when the engine is fixedly operated at a detected idle speed while the amount of intake air is kept at a mass flow which will fixedly provide the first target air charging efficiency, calculates a final target mass flow which provides a first-order lag air charging efficiency equal to the second target air charging efficiency, and controls the opening of the idle regulator valve on the basis of the final target mass flow.

REFERENCES:
patent: 4501240 (1985-02-01), Aono
patent: 4667632 (1987-05-01), Shimomura et al.
patent: 4716871 (1988-01-01), Sakamoto et al.
patent: 4785780 (1988-11-01), Kawai
patent: 4856475 (1989-08-01), Shimomura et al.
patent: 4862851 (1989-09-01), Washino et al.
patent: 4875447 (1989-10-01), Kiuchi et al.
patent: 4884540 (1989-12-01), Kishimoto et al.

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