Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1992-12-21
1994-08-30
Kamen, Noah P.
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60277, F01N 328
Patent
active
053416422
ABSTRACT:
A system which is capable of diagnosing the deterioration condition of an engine exhaust gas purifying device has front and rear air/fuel ratio sensors for detecting the air/fuel ratio of the exhaust gas upstream and downstream of the catalyst, an autocorrelation function calculation for calculating the autocorrelation function .phi.xx of an output signal from the front air/fuel ratio sensor to output the maximum values (.phi.xx)max of the autocorrelation function .phi.xx at predetermined intervals, each maximum value (.phi.xx)max being in each of the predetermined intervals. A cross-correlation function calculator calculates the cross-correlation function .phi.xy between the output signals from the front and rear air/fuel ratio sensors to output the maximum values (.phi.xy)max of the mutual correlation function .phi.xy at predetermined intervals, each maximum value (.phi.xy)max being in each of the predetermined intervals therefore. The ratios between the maximum values (.phi.xy)max and (.phi.xx)max (successive deterioration index .PHI..sub.i) are calculated to determine the deterioration condition of the catalyst by comparing the ratio with a predetermined reference value.
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Ishii Toshio
Kawano Kazuya
Kurihara Nobuo
Mukaihira Takashi
Takaku Yutaka
Hitachi , Ltd.
Kamen Noah P.
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