Browse Publications Technical Papers 2000-05-0325
2000-06-12

The effect of engine misfire on catalytic converter and vehicle emissions 2000-05-0325

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.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.

Due to current capacity constraints, printed versions of our publications - including standards, technical papers, EDGE Reports, scholarly journal articles, books, and paint chips - may experience shipping delays of up to four to six weeks. We apologize for any inconvenience.
We also recommend:
TECHNICAL PAPER

Durability of Ceramic Catalytic Converters for Motorcycles

951768

View Details

TECHNICAL PAPER

Ceramic Catalytic Converters for Motorcycles and Scooters

962472

View Details

TECHNICAL PAPER

Reclaiming of Precious Metals from Automotive Catalytic Converters

820189

View Details

X