The characteristic of zirconia oxygen sensor is that the movement of oxygen ions on both sides will generate electrical voltage, otherwise, the movement of oxygen ions will be generated when the electrical voltage is applied to zirconia. The structure of wideband oxygen sensor is mainly composed of diffusion chamber, reference chamber, pump cell, oxygen concentration cell and a heater. The wideband sensor applies voltage to the pump cell to generate pump current, so that the oxygen content on both sides of the oxygen concentration cell is consistent, and the voltage value is maintained at 0.45V (0.45V as reference). The rich fuel/air mixture will make the oxygen concentration cell voltage greater than 0.45V, and the sensor controller will apply the negative pump current Ip to pump oxygen into the diffusion chamber for chemical reaction, increase the O2 concentration of exhaust gas, and restore the voltage to 0.45V; When lean fuel/air mixture will make the oxygen concentration cell voltage less than 0.45V, the positive pump current Ip will be generated to pump the oxygen out of the diffusion chamber. When the fuel/air is ideal ratio for chemical reaction, the output voltage of the oxygen concentration cell is maintained at 0.45V. In this way, the wideband oxygen sensor reflects the oxygen ion concentration of exhaust gas and the degree of concentration through the value and direction of pump current.

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