Air-fuel ratio control device

Abstract

Abstract PURPOSE:To uniform the output torque of an engine having two exhaust systems and to enhance the conversion efficiency of catalyst, by controlling variations in air-fuel ratio of both systems so that they have opposite phases with respect to each other. CONSTITUTION:A first computing means 32 issues a first control signal S1 for compensating and controlling the air-fuel ratio of a mixture in accordance with the result of detection by a first exhaust detecting means 31. A first mixture metering means 33 meters a mixture fed to a first system in accordance with the first control signal S1. A second mixture computing means 34 issues a second control signal S2 for compensating and controlling the air-fuel ratio of a mixture such that a deviation of the air-fuel ratio of the second system from a predetermined value is made symmetrical with that of the first system with respect to the above-mentioned predetermined value. A second mixture metering device 35 meters a mixture fed to the second system. The air fuel ratios of mixtures fed to engine cylinders of the first and second systems vary in an opposite phase relation with respect each other. With this arrangement, the output torque of the engine is made uniform and as well the conversion efficiency of catalyst may be enhanced.

Inventors

• 👤 Toshimi Anpo
• 👤 安保　敏巳
• 👤 Akio Hosaka
• 👤 保坂　明夫

Bibliographic Details