A separation ΔOSCem between the surveyed value OSCm and the estimated value OSCe is compared with a predetermined value β, and provisional judgment is performed as to whether the catalyst is abnormal or not. 実測値OSCmと推定値OSCeとの間の乖離ΔOSCemを所定値βと比較し、触媒が異常か否かについての仮の判定を行う。 - 特許庁
Meanwhile, stress STR1 which has been given to the catalyst is estimated, and a performance index value OSCe corresponding to the estimated stress is estimated from a predetermined relation L between a stress STR and a performance index value OSC. その一方で、触媒に与えられてきたストレスSTR1を推定し、推定されたストレスに対応した性能指標値OSCeを、ストレスSTRと性能指標値OSCとの間の所定の関係Lから推定する。 - 特許庁