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    • 10. 发明授权
    • Oxygen concentration-detecting device for internal combustion engines
    • 内燃机用氧浓度检测装置
    • US5869744A
    • 1999-02-09
    • US953726
    • 1997-10-17
    • Norio SuzukiDaisuke ShimizuKoichi SaikiYukio Noda
    • Norio SuzukiDaisuke ShimizuKoichi SaikiYukio Noda
    • G01N27/407G01N27/41
    • G01N27/407
    • An oxygen concentration-detecting device detects the concentration of oxygen present in exhaust gases emitted from an internal combustion engine. The device includes an oxygen sensor of a limit current type. A heater heats the oxygen sensor. A first voltage is applied to the oxygen sensor and the concentration of oxygen is detected based on a first output current from the oxygen sensor obtained when the first voltage is applied to the oxygen sensor. A second voltage is applied to the oxygen sensor at a first repetition period and the internal resistance of the oxygen sensor is detected based on a second output current from the oxygen sensor obtained when the second voltage is applied to the oxygen sensor. The oxygen sensor is heated by the heater based on the internal resistance of the oxygen sensor detected. Values of the concentration of oxygen are sampled based on the first output current from the oxygen sensor at a second repetition period shorter than the first repetition period and the sampled values of the concentration of oxygen are stored. The concentration of oxygen is estimated based on the sampled values of the concentration of oxygen stored. In another form of the invention, a predetermined repetition period (first repetition period) at which the second voltage is applied is set in dependence on operating conditions of the engine.
    • 氧浓度检测装置检测从内燃机排出的废气中存在的氧浓度。 该装置包括极限电流型氧传感器。 加热器加热氧气传感器。 第一电压被施加到氧传感器,并且基于当将第一电压施加到氧传感器时获得的氧传感器的第一输出电流来检测氧的浓度。 在第一重复周期将氧传感器施加第二电压,并且基于当将第二电压施加到氧传感器时获得的氧传感器的第二输出电流来检测氧传感器的内阻。 氧传感器由加热器基于检测到的氧传感器的内阻加热。 基于来自氧传感器的第一输出电流以比第一重复周期短的第二重复周期对氧气的浓度进行取样,并且存储氧气浓度的采样值。 氧气的浓度基于存储的氧浓度的采样值来估计。 在本发明的另一形式中,根据发动机的运行条件来设定施加第二电压的预定重复周期(第一重复周期)。