公开(公告)号：EP1324028A1

公开(公告)日：2003-07-02

申请号：EP03007539.4

申请日：1997-11-10

申请人： NGK SPARK PLUG CO., LTD

发明人： Niyata, Shigeru ,  Kondo, Noriaki ,  Inagaki, Hiroshi

IPC分类号： G01N27/407 ,  G01N27/419 ,  G01N27/406

CPC分类号： G01N27/417 ,  G01N27/4074

摘要： Present invention provides a method and device for measuring an oxygen and a nitrogen oxide concentration comprising the steps of causing a small current to flow across an oxygen concentration measuring cell, and a first current to flow in a first oxygen pumping cell so that an output voltage of said oxygen concentration measuring cell will be of a pre-set value; and applying a constant voltage across a second oxygen pumping cell, thereby decomposing nitrogen oxide contained in said second measurement chamber, wherein said nitrogen oxide concentration is measured based on a value of a second current flowing in said second oxygen pumping cell, and said oxygen concentration is measured based on a value of said first current, wherein said temperature detection means is adapted to periodically interrupt said connection between said pump current control means and said oxygen concentration measuring cell and to cause, during such interruption, an amount of current to flow in a direction opposite to a direction of said small current for detecting an internal resistance of said oxygen concentration measuring cell from a voltage generated during said interruption between said electrodes of said oxygen concentration measuring cell.

摘要翻译： 本发明提供了一种用于测量氧和氮氧化物浓度的方法和装置，包括以下步骤：使小电流流过氧浓度测量池，以及第一电流在第一氧气泵浦单元中流动，使得输出电压 的所述氧浓度测量单元将具有预定值; 并且在第二氧气泵浦单元上施加恒定电压，从而分解所述第二测量室中包含的氮氧化物，其中所述氮氧化物浓度基于在所述第二氧气抽吸室中流动的第二电流的值来测量，并且所述氧浓度 基于所述第一电流的值测量，其中所述温度检测装置适于周期性地中断所述泵电流控制装置和所述氧浓度测量单元之间的所述连接，并且在所述中断期间使电流量流入 与所述小电流的方向相反的方向，用于从所述氧浓度测量单元的所述电极之间的所述中断期间产生的电压检测所述氧浓度测量单元的内部电阻。