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    • 3. 发明申请
    • METHOD FOR MONITORING THE FUNCTION OF A GAS SENSOR AND/OR FOR REGENERATING THE SAME
    • 用于功能监测和/或再生的加西索的方法
    • WO0123729A3
    • 2001-08-16
    • PCT/DE0003383
    • 2000-09-28
    • BOSCH GMBH ROBERTSPRINGHORN CARSTENSCHUMANN BERNDTHIEMANN HANDLER SABINE
    • SPRINGHORN CARSTENSCHUMANN BERNDTHIEMANN-HANDLER SABINE
    • G01N27/419G01N27/416G01N27/417
    • G01N27/419
    • The invention relates to a method for monitoring the function of a gas sensor and/or for regenerating the same, especially for use as a lambda sensor or NOx sensor for an internal combustion engine. According to the invention, the sensor is provided with a heatable ceramic sensor body that detects gas molecules, with a first pump electrode disposed in a chamber and with a second pump electrode disposed in the exhaust gas of the internal combustion engine. Between the first and the second pump electrode a pump voltage is applied by means of a pump voltage source so that in the interior of the chamber an oxygen partial pressure is adjusted due to the electrochemical pumping of the oxygen molecules. The inventive method is characterized by the following steps: a) applying a first pump voltage and measuring a first pump current; b) applying a second pump voltage that is higher or lower than the first pump voltage and measuring a second pump current; c) establishing the difference between the first and the second pump current; d) if said difference exceeds a defined value, applying a previously determined saturation pump voltage and comparing the resulting pump current with a minimum pump current previously stored; e) establishing the difference between the minimum pump current and the pump current that occurs at the saturation pump voltage: f) if the difference between the minimum pump current and the pump current that results when the saturation voltage is applied exceeds a defined amount, applying a regeneration voltage that is larger than the saturation voltage and that is generated by a further voltage source.
    • 具有设置在第一泵电极的腔室中,一种用于监测功能和/或再生的气体传感器,特别是用作λ传感器或用于内燃发动机的NO x传感器,其具有可加热的,气体分子检测的探针陶瓷,方法和具有设置在所述内燃机的废气中的 第二泵电极,其特征在于,通过泵电压源的装置中的第一和第二泵电极之间施加泵浦电压,以使氧气分压力由腔室内部的电化学泵出的氧分子进行调整,其特征在于以下步骤:a)将第一泵电压并测量第一 泵电流; b)施加高于或低于第一泵浦电压的第二泵浦电压并测量第二泵浦电流; c)形成第一泵浦电流和第二泵浦电流的差值; d)如果差值超过预定值,则应用先前确定的饱和泵浦电压并将所得的泵浦电流与先前存储的最小泵浦电流进行比较; e)形成最小泵浦电流与饱和泵浦电压处的泵浦电流调整之间的差值; f)如最小泵电流和之间的差的施加时饱和泵电压超过预定量时,施加由一个再生电压比所述饱和电压时产生的进一步的电压源得到的。