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    • 2. 发明申请
    • GAS CONCENTRATION DETECTION APPARATUS
    • 气体浓度检测装置
    • WO2009082030A1
    • 2009-07-02
    • PCT/JP2008/073916
    • 2008-12-24
    • TOYOTA JIDOSHA KABUSHIKI KAISHASASAKI, Takanori
    • SASAKI, Takanori
    • G01N27/407G01N27/406F02D41/06F02D41/12
    • G01N27/419F02D41/06F02D41/123G01N27/4067
    • It is an object of the present invention to provide a gas concentration detection apparatus that is capable of forming an accurate activity judgment when a gas concentration detection cell begins to detect gas concentration with high accuracy. When warm-up begins at time t0 in a NOx concentration detection apparatus that achieves NOx concentration detection with a NOx sensor cell after excess oxygen is discharged by an oxygen pump cell, a NOx sensor cell output (Ls) begins to rise at time t1. Subsequently, at time t2, an oxygen pump cell output (Lp) begins to rise. An inflection point appearing in the NOx sensor cell output is then located. At time t5 at which the inflection point appears, an activity judgment about the NOx sensor cell is formed.
    • 本发明的目的是提供一种气体浓度检测装置,其能够在气体浓度检测单元开始高精度地检测气体浓度时形成准确的活动判定。 当在氧浓度检测装置中的时间t0开始预热时,在通过氧气泵电池排出了过量的氧气之后,利用NOx传感器单元实现NOx浓度检测,NOx传感器单元的输出(Ls)在时间t1开始上升。 随后,在时间t2,氧气泵电池输出(Lp)开始上升。 然后定位出现在NOx传感器单元输出中的拐点。 在出现拐点的时间t5,形成关于NOx传感器单元的活动判断。
    • 5. 发明申请
    • GAS CONCENTRATION DETECTION APPARATUS
    • 气体浓度检测装置
    • WO2009102072A1
    • 2009-08-20
    • PCT/JP2009/052593
    • 2009-02-10
    • TOYOTA JIDOSHA KABUSHIKI KAISHASASAKI, Takanori
    • SASAKI, Takanori
    • G01N27/417
    • G01N27/4175G01N33/0037Y02A50/245
    • The present invention relates to a gas concentration detection apparatus for detecting the concentration of a specific gas component in an exhaust gas emitted from an engine, and forms a deterioration judgment about the gas concentration detection apparatus accurately and immediately. After excess oxygen is discharged by an oxygen pump cell 2, a NOx concentration detection apparatus, which uses a NOx sensor cell 4 to detect the concentration of NOx, judges whether a NOx sensor 1 is activated, that is, whether an inflection point has appeared in the NOx sensor cell output of the NOx sensor 1. If the NOx sensor 1 is not activated yet, an output increase rate Vu (t) of the NOx sensor cell output during an increase process of the NOx sensor cell output is acquired. It is then judged whether the output increase rate Vu (t) is lower than a predetermined reference value Vthl. If the obtained judgment result indicates that Vu (t)
    • 气体浓度检测装置技术领域本发明涉及一种气体浓度检测装置,用于检测从发动机排出的废气中的特定气体成分的浓度,并且准确且立即地形成关于气体浓度检测装置的劣化判定。 在通过氧气泵电池2排出多余的氧之后,使用NOx传感器单元4检测NOx浓度的NOx浓度检测装置判断NOx传感器1是否被激活,即是否出现拐点 在NOx传感器1的NOx传感器单元输出中。如果NOx传感器1还未被激活,则获取在NOx传感器单元输出的增加处理期间输出的NOx传感器单元的输出增加率Vu(t)。 然后判断输出增加率Vu(t)是否低于预定的参考值Vth1。 如果所获得的判断结果表示Vu(t)