The Effect of Intermittent Engine Misfire and Air to Fuel Ratio Excursions on Exhaust Catalyst Temperature

Paper #:
  • 940927

Published:
  • 1994-03-01
Citation:
O'Sullivan, R. and Will, N., "The Effect of Intermittent Engine Misfire and Air to Fuel Ratio Excursions on Exhaust Catalyst Temperature," SAE Technical Paper 940927, 1994, https://doi.org/10.4271/940927.
Pages:
12
Abstract:
The effect of ignition induced misfire on exhaust catalyst temperature has been investigated using an engine bench and a computer model. The effects of misfire rate, exhaust gas flow rate and catalyst condition are reported and conditions that would lead to the melting of a ceramic catalyst are predicted.The modelling techniques have been extended to predict the effect of a fast air to fuel ratio transient on catalyst temperature. Measurements of catalyst temperature during a simulated deceleration using fast response thermocouples have shown that a short lived temperature increase does occur.
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