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    • 4. 发明授权
    • Air-to-fuel ratio sensor
    • 空气 - 燃料比传感器
    • US6077409A
    • 2000-06-20
    • US897667
    • 1997-07-21
    • Jong-heun LeeKyo-yeol Lee
    • Jong-heun LeeKyo-yeol Lee
    • G01N27/419G01N27/407
    • G01N27/4071
    • An air-to-fuel (A/F) ratio sensor includes an insulation layer, two solid electrolyte layers made of a porous composite ceramic formed at both sides of the insulation layer, each solid electrolyte layer having an internal electrode layer on its boundary surface with the insulation layer and an external electrode layer on its other surface, and a diffusion barrier layer made of a porous composite ceramic, covering one of the external electrode layers. The A/F ratio sensor provides a linear A/F ratio signal by controlling only a pumping current for a reference partial pressure of oxygen. Thus, the A/F ratio sensor operates by a simpler driving principle, thereby simplifying the driving circuit thereof.
    • 空气 - 燃料(A / F)比传感器包括绝缘层,形成在绝缘层两侧的由多孔复合陶瓷制成的两个固体电解质层,每个固体电解质层在其边界面上具有内部电极层 其绝缘层和其另一表面上的外部电极层,以及覆盖一个外部电极层的由多孔复合陶瓷制成的扩散阻挡层。 A / F比传感器通过仅控制用于参考氧分压的泵浦电流来提供线性A / F比信号。 因此,A / F比传感器通过更简单的驱动原理操作,从而简化了其驱动电路。
    • 5. 发明授权
    • Planar air-to fuel ratio sensor and driving circuit therefor
    • 平面空对比传感器及其驱动电路
    • US5720863A
    • 1998-02-24
    • US739422
    • 1996-10-29
    • Ho-in KimJong-heun LeeByung-ki Kim
    • Ho-in KimJong-heun LeeByung-ki Kim
    • G01N27/41F02D45/00G01N27/407
    • G01N27/407
    • A planar air-to-fuel (A/F) ratio sensor and a driving circuit therefor are provided. A circuit for driving a planar A/F ratio sensor having a structure wherein an exhaust gas side electrode is shared by a pumping cell and a sensing sell, or a structure wherein an air side electrode is shared by the pumping cell and the sensing cell, is comprised of a comparator for comparing a voltage measured in the sensing cell with a predetermined reference voltage corresponding to the voltage the sensing cell when the pumping cell is within a limit current range to output a voltage which is proportional to the difference between two compared voltages, an integrator for integrating the output of the voltage comparator to output a voltage, an adder for adding a voltage for compensating an electromotive force of the pumping cell to the output voltage of the integrator and an A/F ratio detector for sensing the current flowing through the pumping cell from a voltage output from the adder and applied to the pumping cell to detect an A/F ratio. Therefore, damage to the electrode can be prevented, and the response characteristic between the sensing cell and pumping cell and the accuracy in measuring the A/F ratio can be improved. Also, shift of the current limit region into a region where a voltage V.sub.p is greater than 0 can be compensated by an internal electromotive force of the pumping cell.
    • 提供了一种平面空对燃比(A / F)比率传感器及其驱动电路。 一种用于驱动具有其中排气侧电极被泵浦单元共享的结构和感测销售的结构的平面A / F比传感器的电路或其中空气侧电极被泵浦单元和感测单元共享的结构, 包括比较器,用于在泵浦电池处于限制电流范围内时将感测电池中测量的电压与对应于感测电池的电压的预定参考电压进行比较,以输出与两个比较电压之间的差成比例的电压 ,用于对电压比较器的输出进行积分以输出电压的积分器,用于将用于补偿泵浦单元的电动势的电压与积分器的输出电压相加的加法器和用于感测电流流动的A / F比检测器 通过从加法器输出的电压通过泵浦单元并将其施加到泵浦单元以检测A / F比。 因此,可以防止对电极的损伤,并且可以提高感测单元和泵浦单元之间的响应特性以及测量A / F比的精度。 此外,电流限制区域移动到电压Vp大于0的区域可以通过泵浦单元的内部电动势来补偿。