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    • 1. 发明授权
    • Apparatus for analyzing air/fuel ratio sensor characteristics
    • 用于分析空气/燃料比传感器特性的装置
    • US5648601A
    • 1997-07-15
    • US557631
    • 1995-11-14
    • Kazunori KatohHaruyoshi KondoMasayuki MatsuiNaoki KatayamaYasushi YamadaHideaki TakahashiKunio Fukuda
    • Kazunori KatohHaruyoshi KondoMasayuki MatsuiNaoki KatayamaYasushi YamadaHideaki TakahashiKunio Fukuda
    • G01N27/409G01N27/00G01N27/12G01N27/26G01N33/00G01N7/00
    • G01N33/007
    • An apparatus for analyzing air/fuel ratio sensor characteristics makes it possible to perform highly accurate analysis of the characteristics of an air/fuel ratio sensor to be measured. The apparatus comprises a sensor attachment means in which is mounted an air/fuel ratio sensor to be measured; a gas regulation means for supplying to the sensor attachment means a gas that is substantially equivalent to components of exhaust gases from an engine, or some components thereof; a control means for comparing an output from the air/fuel ratio sensor to be measured mounted in the sensor attachment means and an output from a reference stoichiometric air/fuel ratio sensor at the stoichiometric air/fuel ratio of the engine, to obtain a deviation therebetween and to obtain from a history of this deviation over time the composition and flow rate of gases to be controlled to compensate for this deviation, and issuing appropriate instructions to the gas regulation means; and an air/ratio measurement means for measuring a time average of the thus controlled air/fuel ratio.
    • 用于分析空气/燃料比传感器特性的装置使得可以对待测量的空气/燃料比传感器的特性进行高精度的分析。 该装置包括传感器附接装置,其中安装有待测量的空气/燃料比传感器; 气体调节装置,用于向传感器附接装置供应基本上等同于来自发动机或其一些部件的废气的组分的气体; 控制装置,用于将安装在传感器安装装置中的待测量的空气/燃料比传感器的输出与来自发动机的理论空燃比的参考化学计量空气/燃料比传感器的输出进行比较,以获得偏差 并从这一偏差的历史中获得要控制的气体的组成和流速以补偿该偏差,并向气体调节装置发出适当的指令; 以及用于测量这样控制的空气/燃料比的时间平均值的空气/比率测量装置。
    • 5. 发明授权
    • Device for determining deterioration of air-fuel ratio sensor
    • 用于确定空燃比传感器的劣化的装置
    • US5901691A
    • 1999-05-11
    • US902102
    • 1997-07-29
    • Kazunori Katoh
    • Kazunori Katoh
    • G01N27/26F02D41/14F02D41/22F02D45/00F02M25/00
    • F02D41/1495F02D41/1482F02D41/1456
    • A device for determining deterioration of an air-fuel ratio sensor according to the present invention includes: an air-fuel ratio sensor provided in an exhaust passage of an internal combustion engine, the air-fuel ratio sensor being capable of continuously detecting a broad range of air-fuel ratios including a stoichiometric air-fuel ratio; an air-fuel ratio feedback control circuit for feedback controlling a fuel injection amount based on a difference between an output of the air-fuel ratio sensor and a target output corresponding to a target air-fuel ratio so that an air-fuel ratio of a gaseous mixture substantially equals the target air-fuel ratio, the gaseous mixture being supplied to the engine; a variation cumulative value calculation circuit for cumulating, while the air-fuel ratio feedback control is being performed by the air-fuel ratio feedback control circuit, a variation .DELTA.FT in a fuel injection correction amount, thereby calculating a cumulative variation value .SIGMA..DELTA.FT for a predetermined period; and a deterioration determination circuit for determining that the air-fuel ratio sensor is deteriorated when the cumulative variation value .SIGMA..DELTA.FT calculated by the variation cumulative value calculation circuit exceeds a predetermined value.
    • 根据本发明的用于确定空燃比传感器的劣化的装置包括:空燃比传感器,其设置在内燃机的排气通道中,所述空燃比传感器能够连续检测宽范围 的空燃比,包括理论空燃比; 空燃比反馈控制电路,用于基于空燃比传感器的输出与目标空燃比对应的目标输出之间的差反馈控制燃料喷射量,使得空燃比反馈控制电路的空燃比 气体混合物基本上等于目标空燃比,气体混合物被供给到发动机; 一个变化累计值计算电路,用于在空燃比反馈控制电路执行空燃比反馈控制的同时,在燃料喷射校正量中进行变化量ΔTAFT,从而计算累积变化值SIGMA DELTA FT 预定时间; 以及劣化判定电路,用于当由变化累积值计算电路计算的累积变化值SIGMA DELTAFT超过预定值时,确定空燃比传感器劣化。
    • 6. 发明授权
    • Diagnostic system for a cooling water temperature sensor
    • 冷却水温度传感器诊断系统
    • US5884243A
    • 1999-03-16
    • US879417
    • 1997-06-20
    • Satoru TaniguchiKazunori KatohKoichi MizutaniHideo Mori
    • Satoru TaniguchiKazunori KatohKoichi MizutaniHideo Mori
    • F02D45/00G05B23/02F02D41/00F02M31/00
    • G05B23/0235F02D2200/0414
    • In the present invention, the cooling water temperature sensor is diagnosed using a warming up counter WCT. The value of WCT is increased by the increment WCTINC at predetermined intervals after the engine is started. The increment value WCTINC is determined in accordance with the engine operating parameters affecting the rising rate of the cooling water temperature such as the cooling water temperature when the engine is started, the ambient temperature and the engine load. Therefore, the value of the warming up counter accurately corresponds to the actual cooling water temperature. In the diagnosis operation, when the value of the counter WCT reaches a predetermined setting value, the cooling water temperature detected by the cooling water temperature sensor is compared with a reference temperature which corresponds to the setting value of the warming up counter. If the detected cooling water temperature is lower than the reference temperature, the cooling water temperature sensor is determined to have failed. Since the warming up counter which increases at a rate corresponding to the actual rising rate of the cooling water temperature is used, an accurate diagnosis of the cooling water temperature sensor is performed.
    • 在本发明中,使用预热计数器WCT诊断冷却水温度传感器。 发动机起动后,以预定间隔增加WCCTNC的WCT值。 根据影响冷却水温度上升率的发动机工作参数,如发动机启动时的冷却水温度,环境温度和发动机负荷,确定增量值WCTINC。 因此,预热计数器的值准确地对应于实际的冷却水温度。 在诊断动作中,当计数器WCT的值达到规定的设定值时,由冷却水温度传感器检测的冷却水温度与对应于预热计数器的设定值的基准温度进行比较。 如果检测到的冷却水温度低于参考温度,则冷却水温度传感器被确定为失败。 由于使用以与冷却水温度的实际上升速度相对应的速度增加的预热计数器,因此进行冷却水温度传感器的精确诊断。