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The effect of engine misfire on catalytic converter and vehicle emissions
Technical Paper
2000-05-0325
Sector:
Language:
English
Abstract
A conventional automotive emission control system depends on the
measurements provided by various sensors to control the air-fuel
(A/F) ratio. Maintaining the A/F ratio close to stoichiometry
permits catalytic converter to operate in an optimized efficiency,
which reduces the exhaust emission. Malfunction resulted from
engine misfire makes catalyst''s converting efficiency
drop. Such a condition results in increased emissions as well as in
damage to catalytic converters. So current researches are proceeded
in response to the California OBD II (On-Board Diagnostics) and
EOBD that will be adopted in Europe requirements for engine misfire
detection in passenger vehicles.
In this study, two methods to diagnose the misfire an
approached: catalytic converter''s temperature measurement
over the threshold exposure temperature to examine the
catalyst''s damage, and the vehicle emission test over
FTP-75 cycle by varying misfire rates. The emission performance of
catalytic converter and the catalyst exothermal reaction has been
investigated. The relation between misfiring rate and conversion
performance of catalytic converter has analyzed, which improved the
understanding of the vehicle emission characteristic of OBD II
system.
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