Air-fuel ratio controller

Abstract

Abstract PURPOSE: To ensure correct air-fuel ratio under all speeds and loads of an engine by diza-shifting an air-fuel ratio and by comparing the resultant signals with the signals from an O 2 sensor so as to reduce the amplitude of the difference to the minimum. 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 width by a diza-generator 21, before being applied to a shift control circuit 22. To the shift control circuit 22 are also applied signals from a sensor 19 on an exhaust pipe 17 via an excessive disturbance elimination circuit 27 and pattern discrimination circuit 28, etc. in order to detect deviations from the center of a shift. A swing control circuit 23 reduces the deviation in steps, controlling the operation of a solenoid valve 14 to achieve a theoretically optimum air- fuel ratio. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Masaaki Ogami
• 👤 Fujio Matsui

Bibliographic Details