Electronic control system for carburetor and control method therefor
US4497296A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 1982 |
| Grant date | Feb 5, 1985 |
| Priority date | — |
| Expiry date | Oct 27, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/1456
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A control system for an electronically controlled carburetor operative during engine start-up employs an oxygen-concentration (O.sub.2) sensor which is accurate only a given engine temperature range. Engine temperature in the vicinity of the O.sub.2 sensor is compared to a predetermined threshold to determine whether the O.sub.2 sensor is sufficiently warm. When the O.sub.2 sensor is cold, the carburetor is controlled via an OPEN LOOP method wherein the carburetor is operated at a constant state so as to produce a predetermined constant air/fuel mixture. When the O.sub.2 sensor is warm, its output is processed to determine whether the air/fuel mixture is too rich or too lean as part of a CLOSED LOOP control method in which carburetor operation is adjusted in order to correct the air/fuel ratio in accordance with the output of the O.sub.2 sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.