Air-fuel ratio detector

Abstract

Abstract PURPOSE:To detect an air-fuel ratio from a rich region to a lean region by one detector, by increasing the oxygen content of gas to be inspected by using an oxygen pump while measuring the increased oxygen content by a lean sensor. CONSTITUTION:An air-fuel ratio detector contains a ceramic cylinder 1, a gas diffusion orifice 2, a disc shaped solid electrolyte and electrodes 4a, 4b, 5a, 5b and connected to a DC power source 7 through the electrodes 4a, 5a and a lead wire 6a to constitute an oxygen pump while connected to a DC constant voltage power source 8 and a current measuring apparatus 9 through the electrodes 4b, 5b and a lead wire 6b to constitute a lean sensor. Because a constant amount of oxygen flows from the electrode 5a in the open air side to the electrode 4a to be always flowed into gas to be inspected introduced into the detector from the diffusion orifice 2, the gas to be inspected is brought to a lean state. Because the gas to be inspected comes to a lean state even if said gas is a rich state, the air-fuel ratio of the gas in the space between the diffusion orifice 2 and the solid electrolyte 3 is detected by the lean sensor, that is, by one detector.

Inventors

• 👤 Shigenori Sakurai
• 👤 桜井　茂徳
• 👤 Takashi Kamo
• 👤 加茂　尚
• 👤 Tadayoshi Igai
• 👤 猪飼　忠義

Bibliographic Details