Air intake side secondary air supply system for an internal combustion engine with a duty ratio control operation
US4690121A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1986 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | Jan 14, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D35/003
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An air intake side secondary air supply system for an internal combustion engine having an air intake side secondary air supply passage and an O.sub.2 sensor controls a duty ratio of opening and closing of an open/close valve disposed in the air intake side secondary air supply passage in accordance with a detected air-fuel ratio of mixture by means of an output signal of the O.sub.2 sensor. The system sets a base valve open period of the open/close valve every predetermined period and decreases the base valve open period by a first predetermined correction amount when the detected air-fuel ratio is leaner than a target air-fuel ratio, and increases the base valve open period by a second predetermined correction amount when the detected air-fuel ratio is richer than the target air-fuel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.