Air-Fuel ratio control system for internal combustion engine
US4805578A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1987 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Oct 22, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B2075/027
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An air-fuel ratio control system realized with a computer for an internal combustion engine is disclosed, wherein an idle discriminator unit discriminates whether the internal combustion engine is idle or not, and when it is idle, an idle air-fuel ratio compensation amount determining unit decides an air-fuel ratio compensation amount in accordance with an output of an air-fuel ratio detector. When the engine is not idle, on the other hand, a non-idle air-fuel ratio compensation amount determining unit decides an air-fuel ratio compensation amount. The idle air-fuel ratio compensation amount determining unit includes a rich-lean discriminator unit for discriminating whether the air-fuel ratio is on lean or rich side in accordance with the output of the idle discriminator unit, a skip unit for skipping the air-fuel ratio compensation amount to a greater degree than in non-idle state when the rich-lean discriminator unit decides that the air-fuel ratio has shifted from lean to rich side or the opposite way, a hold unit for holding the compensation amount after skip for a predetermined length of time, and an integrator for integrating the compensation amount upon the lapse of the pred…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.