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    • 3. 发明申请
    • Oxygen Sensor Degradation Judging Device
    • 氧传感器降解判断装置
    • US20080116071A1
    • 2008-05-22
    • US11795246
    • 2006-01-11
    • Motonori NakamuraAkira Uchikawa
    • Motonori NakamuraAkira Uchikawa
    • G01N27/26
    • G01N27/4175
    • This device is a degradation judging device for an oxygen sensor having a reference electrode 23 and a measuring electrode 22, both of which hold a solid electrolyte layer therebetween, and measuring oxygen concentrations based on an electromotive force that occurs in accordance with a difference between an oxygen partial pressure of the reference electrode 23 and an oxygen partial pressure of the measuring electrode 22. A control unit 10, which controls operations of intake and exhaust valves, a spark plug and a fuel injection valve, has a degradation judging means that detects an internal resistance value “R1” of the solid electrolyte layer 21 by applying a high-frequency alternating current between the reference electrode 23 and the measuring electrode 22, and judges degradation of the solid electrolyte layer 21 by comparing an average value of the detected internal resistance value “R1” with a reference value. By this judgment, the degradation of the solid electrolyte layer 21 can accurately be judged, and an occurrence of the engine stall or emission failure can be prevented.
    • 该装置是具有参考电极23和测量电极22的氧传感器的劣化判定装置,两者都在其间保持固体电解质层,并且基于根据电流的差异发生的电动势来测量氧浓度 参考电极23的氧分压和测量电极22的氧分压。 控制单元10,其控制进气门和排气门的操作,火花塞和燃料喷射阀,具有劣化判定装置,其通过施加高频来检测固体电解质层21的内部电阻值“R 1” 通过将检测出的内部电阻值“R 1”的平均值与参考值进行比较来判断固体电解质层21的劣化,从而判断参考电极23与测量电极22之间的交流电流。 通过这种判断,可以准确地判断固体电解质层21的劣化,能够防止发动机失速或发光故障的发生。
    • 5. 发明授权
    • Method and apparatus for diagnosing an abnormality in a wide range
air-fuel ratio sensor
    • 用于诊断大范围空燃比传感器的异常的方法和装置
    • US5970967A
    • 1999-10-26
    • US987098
    • 1997-12-08
    • Akira Uchikawa
    • Akira Uchikawa
    • F02D45/00F02D41/04F02D41/14F02D41/22
    • F02D41/222Y02T10/40
    • An object is to carry out abnormality diagnosis of a wide range air-fuel ratio sensor to a high accuracy, with a relatively simple construction. Judgment is made as to whether abnormality diagnosis permit conditions have materialized, and if materialized, a detection value of an air-fuel ratio sensor is monitored. It is then judged if the responsiveness of a change in the detection value of the air-fuel ratio sensor subsequent to changing a target air-fuel ratio is within a predetermined range. If so, an OK judgment is given. If not, an NG judgment is given and a warning lamp is illuminated to advise the driver of the abnormality in the air-fuel ratio sensor so as to take action. With this arrangement, abnormality diagnosis of a wide range air-fuel ratio sensor can be carried out to a high accuracy with a relatively simple construction.
    • 目的是以较为简单的结构高精度地进行宽范围的空燃比传感器的异常诊断。 判断异常诊断许可条件是否已经实现,如果实现,则监视空燃比传感器的检测值。 然后判断在改变目标空燃比之后空燃比传感器的检测值的变化的响应性是否在预定范围内。 如果是的话,给出一个OK的判断。 如果没有,则给出NG判断,并且点亮警告灯以向驾驶员通知空燃比传感器中的异常以便采取行动。 利用这种结构,能够以相对简单的结构高精度地进行宽范围的空燃比传感器的异常诊断。