Air-fuel ratio controller in internal-combustion engine

Abstract

Abstract PURPOSE:To improve control accuracy of air-fuel ratio in such a way that the time constant of an integrator which switches the air-fuel ratio control from its open loop control over to its feedback control is made smaller when changing to idling condition. CONSTITUTION:A timer 45 which measures the lapse of the determined time since the time when the engine is changed from its decelerating condition to its idling condition is provided in a control circuit. And, such constants are also set, as time constants K1, K2 for feedback control during idling, time constants K3, K4 for feedback control during non-idling periods, such as acceleration and normal running, and time constants K'1, K'2 for feedback control from the time when it is changed from its decelerating condition to its idling condition to the lapse of the determined time T. Here, the time constants are set to satisfy the relation of K1>K'1>K3, K2>K'2>K4.

Inventors

• 👤 Atsushi Takahashi
• 👤 淳 高橋
• 👤 Takeshi Shiozawa
• 👤 塩沢　健
• 👤 Kiyoshi Asada
• 👤 浅田　潔
• 👤 Takayoshi Nakagawa
• 👤 中川　孝義

Bibliographic Details