Air-fuel ratio controller

Abstract

Abstract PURPOSE: To ensure correct air-fuel ratio by shifting air-fuel ratio against a pattern and by comparing the resultant signals with the signals from an O 2 sensor to discriminate the difference. CONSTITUTION: The air bleed, etc. in a carburetor 1 is controlled by a solenoid valve 14 which is opened and closed by a control circuit 20. The air-fuel ratio in the intake system of an engine 2 is determined by a datum cycle set circuit 25, and is shifted in a narrow limit by a diza-generator 21, before being applied to a shift control circuit 22. Within the diza-circuit, the width is variable according to signals generated by an RPM detector 26. To the shift control circuit 22 are also applied signals from a sensor 19 on an exhaust pipe 17 via, an excessive disturbance elemination circuit 27 and a pattern discrimination circuit 28, etc. in order to detect deviations from the center of the shift. A swing control circuit 23 serves to adjust that center, controlling operation of a solenoid valve 14 through a drive circuit 24 so as to achieve ideal air-fuel ratio under all speeds and load of the engine. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Masaaki Ogami

Bibliographic Details