3次元拡散モデルによる広域空燃比センサの静特性解析

概要

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Various types of sensors to measure wide range air-fuel rations have currently been developed. Most are composed of an electrochemical oxygen pumping cell and a diffusion controlling part. This paper presents a numerical method to analyze the steady-state characteristics of such sensors, using a three-dimensional diffusion model and considering electrochemical reactions. The following results are obtained, considering serveral kinds of gas components: Sensor characteristics are simulated under both λ≧1 and λ<1 conditions; the current value I_p* at the pumping cell is consistent with the experimental value, as is the sensor output. Calculations are also made of several sensor model types by changing the size of some of their parts. It is clear that the I_p* value depends on the gas diffusion, controlled either by the leak aperture or by the diffusion chamber of the sensor.
一般社団法人日本機械学会の論文
1986-05-25