Method for control of idle rotations of internal combustion engine
US4760823A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1986 |
| Grant date | Aug 2, 1988 |
| Priority date | — |
| Expiry date | May 22, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/1422
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An addition correction term is added to a feedback control term when an internal combustion engine is idling, a control valve is under feedback control, and an automatic transmission is in drive range (D range). The addition correction term is calculated by multiplying a predetermined constant value by at least one of several correction coefficients which are based on RPM and temperature of the engine and vehicle speed. A learnt value is calculated based on intake manifold pressure when the internal combustion engine is in idling condition, the control valve is under feedback control, and the automatic transmission is in disengagement condition, for example, neutral range (N range). When the automatic transmission is turned into D range, the existing manifold pressure is detected and the addition correction term is calculated based on the difference between the learnt value and the detected manifold pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.