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Study on Fault Diagnosis System for Vehicular TWC
Technical Paper
2005-03-0218
Sector:
Language:
English
Abstract
The fault diagnosis testing method of TWC is investigated in
this paper. By analyzing its invalid mechanism, it's shown that
the conversion efficiency of TWC that has chemical invalid reduces
obviously and the air flow characteristic in front and back of TWC
that has physical invalid is affected. In this paper, the practical
tester is designed and strategy of fault diagnosis system for TWC
is proposed.
The data of emission component and pressure fluctuation of fore
and rear of TWC is analyzed by fault diagnosis software. The
conversion efficiency is calculated. Fault diagnosis result is
given according to fault characteristic in qualitative pattern
identification system, and operational performance of TWC is
evaluated. The durable performance is forecasted in this system.
Because the engine running is related with performance of TWC, the
misdiagnosis caused by not TWC factor is reduced greatly. The time
of collecting and analyzing basic data is very brief, and it has
advantages of online, real-time and fast diagnosis.