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    • 6. 发明授权
    • Dual-sensor type air-fuel ratio control system for internal combustion
engine and catalytic converter diagnosis apparatus for the same
    • 用于内燃机和催化转化器诊断装置的双传感器型空燃比控制系统
    • US5426937A
    • 1995-06-27
    • US308535
    • 1994-09-21
    • Hirofumi OhuchiShinya Fujimoto
    • Hirofumi OhuchiShinya Fujimoto
    • F01N11/00F02D41/14F01N3/20
    • F02D41/0235F01N11/007F02D41/1441F01N2550/02F01N2900/0421F01N2900/0422F02D2041/1409F02D2041/1432F02D2041/228Y02T10/47
    • A dual-sensor type air-fuel ratio control system for an internal combustion engine. A catalytic converter is disposed within an exhaust pipe for purifying an exhaust gas. A first air-fuel ratio sensor 11 is disposed upstream of the catalyst for detecting concentration of a particular component of the exhaust gas to output a first air-fuel ratio signal V1 indicating the concentration. A second air-fuel ratio sensor 12 is disposed downstream of the catalyst for detecting concentration of the particular exhaust gas component to output a second air-fuel ratio signal V2 indicating the concentration. An apparatus for detecting deterioration of the catalytic converter includes a deterioration decision means 54 for determining deterioration of the catalyst on the basis of at least the second air-fuel ratio signal, a filtering means 50 for filtering the second air-fuel ratio signal to thereby derive a filtered air-fuel ratio signal, and comparison means 51 for comparing the second air-fuel ratio signal with the filtered air-fuel ratio signal. The deterioration decision means compares a deterioration parameter value derived from the result of the comparison with a predetermined value corresponding to a detected operation state of the engine to determine deterioration of the catalyst when the deterioration parameter value exceeds the predetermined value.
    • 一种用于内燃机的双传感器型空燃比控制系统。 催化转化器设置在用于净化废气的排气管内。 第一空燃比传感器11设置在用于检测排气的特定部件的浓度的催化剂的上游,以输出表示浓度的第一空燃比信号V1。 第二空燃比传感器12设置在用于检测特定废气分量的浓度的催化剂的下游,以输出指示浓度的第二空燃比信号V2。 用于检测催化转化器的劣化的装置包括用于基于至少第二空燃比信号确定催化剂的劣化的劣化判定装置54,用于过滤第二空燃比信号的过滤装置50, 得到过滤的空燃比信号,以及比较装置51,用于将第二空燃比信号与经过滤的空燃比信号进行比较。 劣化决定装置将从比较结果导出的劣化参数值与对应于检测到的发动机运转状态的规定值进行比较,判定劣化参数值超过规定值时催化剂的劣化。
    • 7. 发明授权
    • Malfunction sensing apparatus for a fuel vapor control system
    • 用于燃料蒸气控制系统的故障检测装置
    • US5327873A
    • 1994-07-12
    • US111493
    • 1993-08-25
    • Hirofumi OhuchiShinya Fujimoto
    • Hirofumi OhuchiShinya Fujimoto
    • F02D41/00F02M25/08F02M33/02
    • F02M25/0809
    • A malfunction sensing apparatus for a fuel vapor control system includes a fuel tank and a canister containing an adsorbent for adsorbing fuel vapor. The canister has an inlet connected to the fuel tank and an outlet. A purge control valve is connected to the outlet for connecting and disconnecting the outlet of the canister from the air intake pipe of an engine. A pressure sensor senses the internal pressure of the fuel tank. A malfunction sensing means responsive to the pressure sensor senses a malfunction when the purge control valve is open and the pressure sensed by the pressure sensor is above a prescribed value. A prohibiting means senses the rate of change and/or the magnitude of the pressure sensed by the pressure sensor with the purge control valve closed and prohibits malfunction sensing by the malfunction sensing means when the rate of change of the pressure exceeds a prescribed rate and/or the magnitude of the pressure exceeds a prescribed value.
    • 用于燃料蒸汽控制系统的故障检测装置包括燃料箱和容纳吸附燃料蒸气的吸附剂的罐。 罐具有连接到燃料箱和出口的入口。 清洗控制阀连接到出口,用于将罐的出口与发动机的进气管连接和断开。 压力传感器检测燃油箱的内部压力。 当清洗控制阀打开并且压力传感器感测到的压力高于规定值时,响应于压力传感器的故障感测装置感测故障。 禁止装置检测当吹扫控制阀关闭时由压力传感器感测到的压力变化率和/或大小,并且当压力变化率超过规定速率时禁止故障检测装置的故障感测和/ 或压力的大小超过规定值。