Air-fuel ratio control apparatus
US4485786A · kind A · utility
7Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1983 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | Jul 15, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1474
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an air-fuel ratio control apparatus for controlling the air-fuel ratio of an engine in accordance with the output of an O.sub.2 sensor, in response to the starting of the engine the output voltage of the O.sub.2 sensor is sampled at intervals of a unit time. The slope of the output voltage waveform of the O.sub.2 sensor is computed from the successively sampled values. The computed value is compared with a predetermined value indicative of a slope value attained when the O.sub.2 sensor is activated and thus it is considered that the O.sub.2 sensor is activiated when the computed value is greater than the predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.