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    • 15. 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)。
    • 17. 发明授权
    • Air-fuel ratio control system for internal combustion engines
    • 内燃机空燃比控制系统
    • US5732689A
    • 1998-03-31
    • US606382
    • 1996-02-23
    • Hiroshi OhnoKoichi SaikiYukio NodaShusuke AkazakiYoshitaka TakasukaYusuke Hasegawa
    • Hiroshi OhnoKoichi SaikiYukio NodaShusuke AkazakiYoshitaka TakasukaYusuke Hasegawa
    • F02D41/00F02D41/14F02D41/34F02D41/22
    • F02D41/008F02D41/1441F02D41/2454F02D41/2474F02B2275/18F02D41/1456F02D41/2477
    • An air-fuel ratio control system for an internal combustion engine has an air-fuel ratio sensor arranged in an exhaust passage of the engine for detecting an air-fuel ratio of exhaust gases emitted from a plurality of cylinders. An output from the air-fuel ratio sensor is sampled whenever the engine rotates through a predetermined crank angle, and sampled values of the output from the air-fuel ratio sensor are sequentially stored. An output characteristic of the air-fuel ratio sensor is detected. One of the sampled values of the output from the air-fuel ratio sensor is selected at least depending on the output characteristic of the air-fuel ratio sensor. An air-fuel ratio of a mixture supplied to each of the cylinders is estimated, separately from other ones of the cylinders, based on selected ones of the sampled values of the output from the air-fuel ratio sensor and a model representative of a behavior of the exhaust passage. The air-fuel ratio of the mixture supplied to the each of the cylinders is controlled in a feedback manner responsive to the estimated air-fuel ratio of the mixture such that the estimated air-fuel ratio of the mixture supplied to the each of the cylinders is converged to a desired air-fuel ratio.
    • 用于内燃机的空燃比控制系统具有布置在发动机的排气通道中的空燃比传感器,用于检测从多个气缸排出的废气的空燃比。 每当发动机旋转预定的曲柄角时,对空燃比传感器的输出进行采样,依次存储来自空燃比传感器的输出的采样值。 检测空燃比传感器的输出特性。 至少根据空燃比传感器的输出特性来选择空燃比传感器的输出的取样值之一。 基于来自空燃比传感器的输出的取样值和代表行为的模型中的选定的一个来估计提供给每个气缸的混合物的空燃比与其它气缸分开地估计 的排气通道。 供给到每个气缸的混合物的空燃比以响应于混合物的估计空燃比的反馈方式进行控制,使得供给到每个气缸的混合物的估计空燃比 收敛到期望的空燃比。