Idling rotational speed control system for internal combustion engines after cranking
US4964386A · kind A · utility
9Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1989 |
| Grant date | Oct 23, 1990 |
| Priority date | — |
| Expiry date | Oct 6, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/1422
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system for controlling the idling rotational speed of an internal combustion engine controls a control valve for adjusting the opening area of an intake air passage bypassing a throttle valve after cranking of the engine, by the use of control terms including a differential term which is based on a variation in the engine rotational speed and is set and held at zero before a predetermined time period elapses after completion of cranking of the engine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.