TROUBLE DIAGNOSIS DEVICE FOR EXHAUST GAS PURIFICATION SYSTEM AND TROUBLE DIAGNOSIS METHOD FOR EXHAUST GAS PURIFICATION SYSTEM
    9.
    发明申请
    TROUBLE DIAGNOSIS DEVICE FOR EXHAUST GAS PURIFICATION SYSTEM AND TROUBLE DIAGNOSIS METHOD FOR EXHAUST GAS PURIFICATION SYSTEM 审中-公开
    用于排气净化系统的故障诊断装置和排气净化系统的故障诊断方法

    公开(公告)号:US20100024394A1

    公开(公告)日:2010-02-04

    申请号:US12525401

    申请日:2008-01-25

    申请人: Eiichi Kitazawa

    发明人: Eiichi Kitazawa

    IPC分类号: F01N11/00 F01N3/10

    摘要: There are provided a trouble diagnosis device and a trouble diagnosis method for an exhaust gas purification system in which the presence or absence of a trouble of the exhaust gas purification system such as abnormality of a control system for the exhaust gas purification system, catalyst deterioration or the like can be determined with high precision, and the reliability of the exhaust gas purification system can be enhanced.The device includes upstream-side NOx flow rate calculating means, downstream-side NOx flow rate calculating means, reduction condition determining means for determining whether at least one condition for performing normal reduction of NOx is satisfied, upstream-side NOx flow amount calculating means for integrating the upstream-side NOx flow amount to calculate the amount of NOx passing through the upstream side of the catalyst within a predetermined time when the condition concerned is determined to be satisfied, downstream-side NOx amount calculating means for integrating the downstream-side NOx flow amount to calculate the amount of NOx passing through the downstream side of the catalyst within a predetermined time when the condition concerned is determined to be satisfied, and trouble determining means for comparing the upstream-side NOx amount and the downstream-side NOx amount to determine whether the exhaust gas purification system operates normally.

    摘要翻译: 提供了一种排气净化系统的故障诊断装置和故障诊断方法,其中有无排气净化系统的故障,例如排气净化系统的控制系统的异常,催化剂劣化或 可以高精度地确定,能够提高排气净化系统的可靠性。 该装置包括上游侧NOx流量计算装置,下游侧NOx流量计算装置,用于确定是否满足用于执行正常NOx还原的至少一个条件的还原条件确定装置,上游侧NOx流量计算装置, 整合上游侧NOx流量,在确定满足有关条件的规定时间内,计算通过催化剂上游侧的NOx量,下游侧NOx量计算单元,其将下游侧NOx 在确定满足有关条件的规定时间内,计算经过催化剂下游侧的NOx的量的流量;以及将上游侧NOx量与下游侧NOx量进行比较的故障判定单元, 确定废气净化系统是否正常运行。

    Trouble diagnosis device and trouble diagnosis method for NOx sensor
    10.
    发明授权
    Trouble diagnosis device and trouble diagnosis method for NOx sensor 有权
    NOx传感器故障诊断装置及故障诊断方法

    公开(公告)号:US08359826B2

    公开(公告)日:2013-01-29

    申请号:US12525408

    申请日:2008-01-25

    申请人: Eiichi Kitazawa

    发明人: Eiichi Kitazawa

    IPC分类号: F01N11/00 G01M15/10

    摘要: A trouble diagnosis device and method for an NOx sensor for determining abnormality of an NOx sensor used in an exhaust gas purification system. The device can perform a trouble diagnosis without forcedly creating a diagnosis mode during operation of an internal combustion engine and without deterioration of drivability or fuel consumption. The device detects the time-lapse variation of the exhaust NOx flow rate suitable for diagnosis in a normal operation mode and determines whether the NOx sensor responds with following this variation.

    摘要翻译: 一种用于确定在废气净化系统中使用的NOx传感器的异常的NOx传感器的故障诊断装置和方法。 该装置可以执行故障诊断,而不会在内燃机的运行期间强制建立诊断模式,并且不会降低驾驶性能或燃料消耗。 该装置检测适合于正常运行模式下的诊断的排气NOx流量的延时变化,并且确定NOx传感器是否响应该变化。