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    • 46. 发明授权
    • System for detecting deterioration of catalyst for purifying exhaust gas
    • 用于检测废气净化催化剂的劣化的系统
    • US06295807B1
    • 2001-10-02
    • US09564534
    • 2000-05-04
    • Hisayo DoutaMasaaki NakayamaYasuo Mukai
    • Hisayo DoutaMasaaki NakayamaYasuo Mukai
    • F01N300
    • F01N11/007F01N2550/02F01N2900/0422Y02T10/47
    • In a system for detecting deterioration of an exhaust catalyst, when a catalyst temperature exceeds 150° C., the changing widths of the output voltage of an oxygen sensor downstream of the catalyst are integrated for a predetermined sampling period to determine data &Sgr;V reflecting the amount of purified gas component, and the deviation of the air/fuel ratio detected by an air/fuel ratio sensor upstream of the catalyst, and a target A/F and an exhaust gas flow rate or an intake flow rate are multiplied so that data &Sgr;A/F&Circlesolid;Q of the fluctuation of the gas component flowing into the catalyst are determined by integrating the multiplied values. At the instant when the catalyst temperature reaches 550° C., the data &Sgr;V, as integrated till then, are compared with a deterioration determining value, as set according to the data &Sgr;A/F&Circlesolid;Q, to determine whether the catalyst is deteriorated.
    • 在用于检测排气催化剂的劣化的系统中,当催化剂温度超过150℃时,将催化剂下游的氧传感器的输出电压的变化宽度整合为预定的采样周期,以确定反映量 的净化气体成分,并且由催化剂上游的空气/燃料比传感器检测到的空气/燃料比的偏差和目标A / F和排气流量或进气流量相乘,使得数据SIGMAA / F&Circlef;流入催化剂的气体成分的波动的Q通过对相乘值进行积分来确定。 在催化剂温度达到550℃的时刻,将与之结合的数据SIGMAV与根据数据SIGMAA / F&Circlef; Q设定的劣化判定值进行比较,以确定催化剂是否劣化。
    • 47. 发明授权
    • System for detecting deterioration of catalyst for purifying exhaust gas
    • 用于检测废气净化催化剂的劣化的系统
    • US06073440A
    • 2000-06-13
    • US828181
    • 1997-03-18
    • Hisayo DoutaMasaaki NakayamaYasuo Mukai
    • Hisayo DoutaMasaaki NakayamaYasuo Mukai
    • F02D45/00F01N3/20F01N11/00F02D41/14F01N3/00
    • F01N11/007F01N2550/02F01N2900/0422Y02T10/47
    • In a system for detecting deterioration of an exhaust catalyst, when a catalyst temperature exceeds 150.degree. C., the changing widths of the output voltage of an oxygen sensor downstream of the catalyst are integrated for a predetermined sampling period to determine data .SIGMA.V reflecting the amount of purified gas component, and the deviation of the air/fuel ratio detected by an air/fuel ratio sensor upstream of the catalyst, and a target A/F and an exhaust gas flow rate or an intake flow rate are multiplied so that data .SIGMA.A/F .cndot.Q of the fluctuation of the gas component flowing into the catalyst are determined by integrating the multiplied values. At the instant when the catalyst temperature reaches 550.degree. C., the data .SIGMA.V, as integrated till then, are compared with a deterioration determining value, as set according to the data .SIGMA.A/F.cndot.Q, to determine whether the catalyst is deteriorated.
    • 在用于检测排气催化剂的劣化的系统中,当催化剂温度超过150℃时,催化剂下游的氧传感器的输出电压的变化宽度被集成预定的采样周期,以确定反映 净化气体成分的量,以及由催化剂上游的空气/燃料比传感器检测到的空气/燃料比的偏差,目标A / F和废气流量或进气流量相乘,使得数据 通过积分相乘值来确定流入催化剂的气体成分的波动的SIGMA A / F .Q。 在催化剂温度达到550℃的时刻,将与之结合的数据SIGMA V与根据数据SIGMA A / F.Q设定的劣化判定值进行比较,以确定催化剂是否劣化。
    • 48. 发明授权
    • Apparartus for detecting deterioration of catalysts
    • Apparartus用于检测催化剂的劣化
    • US5528898A
    • 1996-06-25
    • US524446
    • 1995-09-06
    • Masaaki NakayamaYasuo Mukai
    • Masaaki NakayamaYasuo Mukai
    • F02D45/00F01N3/20F01N11/00F02D41/14F01N3/28
    • F01N11/007F01N2550/02F01N2900/0421F01N2900/0422Y02T10/47
    • A catalyst deterioration determination is performed in two stages. In the first stage of determination, an amplitude of an output signal from a downstream oxygen sensor is detected and this amplitude is compared with a reference value in order to determine possible deterioration in a catalyst. When correct performance is expected, while taking into account variations (amplitude and response) in the upstream and downstream oxygen sensors, then the detection in a second stage is omitted. However when possible catalyst deterioration may be present, the determination at the seconds stage is performed. After adjusting the response of the upstream oxygen sensor to the characteristic of the slowest response, the total response delay time of the downstream sensor is obtained within a specified amount of time, and this sum then is compared with a reference value indicating catalyst deterioration. A final determination is made as to whether catalyst deterioration is present.
    • 催化剂劣化确定分两个阶段进行。 在确定的第一阶段,检测来自下游氧传感器的输出信号的幅度,并将该振幅与参考值进行比较,以确定催化剂的可能劣化。 当预期正确的性能时,考虑到上游和下游氧传感器的变化(振幅和响应),则省略在第二级中的检测。 然而,当可能的催化剂劣化可能存在时,执行在秒级的确定。 在将上游氧传感器的响应调整到最慢响应的特性之后,在规定的时间内获得下游传感器的总响应延迟时间,然后将该和与表示催化剂劣化的参考值进行比较。 最后确定是否存在催化剂劣化。