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    • 8. 发明授权
    • Abnormality diagnosis system and control system for internal combustion engine
    • 内燃机异常诊断系统及控制系统
    • US08280575B2
    • 2012-10-02
    • US12073111
    • 2008-02-29
    • Tomohiro Takahashi
    • Tomohiro Takahashi
    • G01M17/00
    • G01M15/09F02D41/0007F02D41/0047F02D41/221F02D41/3845F02D2041/224F02D2250/31
    • An ECU (60) for an engine (10, 70) monitors a change of an actual fuel pressure (NPC), when a target fuel pressure (PFIN) is changed stepwise. In one abnormality, the time required for the actual fuel pressure to reach the target fuel pressure is equal to that when an actuator (34) operates normally. However, the maximum value of a differential value (dNPC/dt) with respect to time of the actual fuel pressure is different from that when the actuator operates normally. For this reason, a normal range is set in advance for the maximum value of the differential value with respect to time of the actual fuel pressure and when the maximum value of the differential value with respect to time of the actual fuel pressure is out of the normal range, it is determined that the actuator operates abnormally.
    • 当目标燃料压力(PFIN)逐步变化时,用于发动机(10,70)的ECU(60)监视实际燃料压力(NPC)的变化。 在一个异常情况下,实际燃料压力达到目标燃料压力所需的时间等于致动器(34)正常运行时所需的时间。 然而,相对于实际燃料压力的时间的差分值(dNPC / dt)的最大值与当致动器正常运行时的最大值不同。 因此,相对于实际燃料压力的时间,差分值的最大值相对于实际燃料压力的时间的差分值的最大值超过了实际燃料压力的时间,预先设定正常范围 在正常范围内,确定执行器异常运行。