AIR-FUEL RATIO CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINES

• Main Authors: ICHIKAWA, NORIMO, UENO, SADAYASU, ITSUJI, TAKAYUKI
• Format: Patent
• Language: English; Korean
• Published: 17.08.1998
• Edition: 6
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIGHTING; MEASURING; MECHANICAL ENGINEERING; PHYSICS; TESTING; WEAPONS

한쪽의 면이 대기에 접촉된 제1의 전극(35)을 구비하고, 다른 쪽의 면이 확산 저항체(36)를 사이에 두고 내연기관의 배기가스와 접촉된 제2의 전극(34)을 구비한 고체 전해질(33)과, 제1의 전극과 제2의 전극간에 전압을 인가하여 상기 고체전해질을 흐르는 산소펌프 전류를 검출하는 수단(14)을 구비하여, 확산 저항체의 확산계수의 변화에 관한 보정계수를 산출하고, 그 보정계수에 의거하여 상기 검출수단에서 검출된 산소펌프 전류를 수정하며, 그 수정된 산소펌프 전류에 의거하여 배기가스의 공연비를 결정하고, 그 결정된 공연비에 의거하여 내연기관에 공급되는 연료공급량을 제어하는 내연기관의 공연비 제어장치. An air-fuel ratio control apparatus for an internal combustion engine includes a solid electrolyte having a first electrode disposed on one surface thereof to contact with the atmosphere and a second electrode disposed on the other surface thereof to contact with the exhaust gas from the engine through a diffusing resistor, and means for applying a voltage across the first and second electrodes to detect an oxygen pump current flowing in the solid electrolyte whereby a correction factor relating to a change in the diffusion coefficient of the diffusing resistor is computed so that the oxygen pump current detected by the detecting means is corrected in accordance with the correction factor and the air-fuel ratio of the exhaust gas is determined in accordance with the corrected oxygen pump current, thereby controlling the quantity of fuel supplied to the engine in accordance with the determined air-fuel ratio.