Air-fuel ratio control system for an internal combustion engine
US4526148A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1983 |
| Grant date | Jul 2, 1985 |
| Priority date | — |
| Expiry date | Mar 2, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/149
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A closed-loop air-fuel control system for an internal combustion engine comprising a control circuit having an open-loop mode of operation in which an air-fuel ratio control signal is fixed to a predetermined value determined by a sensed value of the atmospheric pressure and the temperature of the intake air of the engine. In order to shorten the time period for calculating the air-fuel ratio and to simplifying the circuit construction, an output signal of an atmospheric pressure sensor is supplied to an intake air temperature sensor so as to produce an output signal which represents both the temperature of the intake air and the atmospheric pressure at the same time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.