Multi-cylinder engine combustion state diagnosis a

专利名称：Multi-cylinder engine combustion state

diagnosis apparatus and method

发明人：Kashimura, Yuichi,Takaku, Yutaka,Ishii, Toshio申请号：EP94118786.6申请日：19941129公开号：EP0655616B1公开日：19990127

摘要：A prescribed threshold level Dth for misfire judgment for each cylinder isrecorded in a misfire judgment level retaining means 102 of a misfire judgmentprocessing section 100. A combustion state parameter operation means 106 measuresrevolution speed of a multi-cylinder engine for each cylinder, and attains as a combustionstate parameter a differential in revolution speed between a specific cylinder and othercylinders. In a misfire judgment level correction means 104, a plurality of combustionstate parameters concerning the specific cylinder is attained, and the above-mentionedthreshold level Dth is corrected as a function of the parameter. A misfire judgmentprocessing means 108 compares the combustion state parameter with the thresholdlevel Dth and diagnoses a combustion state in the specific cylinder. Namely, the

corresponding cylinder is judged to be misfire when the combustion state parameter ofthe specific cylinder exceeds the prescribed parameter.

申请人：HITACHI LTD

地址：JP

国籍：JP

代理机构：Altenburg, Udo, Dipl.-Phys.

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