Idle speed control system for engine
US5065717A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1990 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Dec 27, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/16
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.