Fuel supply control method for internal combustion engines at operation in a low speed region
US4751909A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 18, 1987 |
| Grant date | Jun 21, 1988 |
| Priority date | — |
| Expiry date | May 18, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B1/04
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fuel supply control method for controlling the quanity of fuel being supplied to an internal combustion engine, in a feedback manner responsive to the output of a means for detecting the concentration of an ingredient in exhaust gases emitted from the engine. When the engine is operating in a predetermined low speed operating region wherein the rotational speed of the engine is lower than a predetermined speed higher than the idling speed and the intake pipe absolute pressure is higher than a predetermined value higher than a value normally assumed at idle of the engine, the above feedback control is interrupted and the fuel quantity is increased by a predetermined amount so as to make the air/fuel ratio of a mixture being supplied to the engine richer than a theoretical mixture ratio. Preferably, the above predetermined speed and predetermined intake pipe absolute pressure applied for determination of the operating condition of the engine in the predetermined low speed operating region are each set to different values between when the operation of the engine enters the predetermined low speed operating region and when it leaves the same region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.