Air-fuel ratio controller for engine

Abstract

Abstract PURPOSE:To make the convergence of an air-fuel ratio onto the desired air-fuel ratio performable in a short time, by compensating a fundamental control variable at the point that a feedback compensation value exceeds the setting value when evaporated fuel is purged during feedback control over the air-fuel ratio. CONSTITUTION:According to the fundamental controlled variable found on the basis of output of a driving state detecting device 65, fuel is metered by a fuel metering device 79, while an air-fuel ratio of mixture is feedback- controlled to the desired value by an air-fuel ratio controlling device 80 according to the compensation value conformed to output of an air-fuel ratio sensor 54. In a suchlike device, there is provided with a purge controlling device 82 which controls a purge device 35 purging evaporated fuel to a suction system of an engine 1 according to an engine driving state. And, at a time when a detecting device 84 detects purge time of the evaporated fuel, when the compensation value of feedback control by the air-fuel ratio controlling device 80 exceeds the setting value, there is also provided with a fundamental controlled variable compensating device 85 compensating the fundamental controlled variable of the fuel metering device 79.

Inventors

• 👤 Toshio Matsubara
• 👤 松原　敏雄
• 👤 Takashi Suzuki
• 👤 敬 鈴木
• 👤 Isao Shibata
• 👤 勲 柴田

Bibliographic Details