The Influence of Coolant Temperature on Unburned Hydrocarbon Emissions from Spark Ignition Engine

Paper #:
  • 941962

Published:
  • 1994-10-01
Citation:
Guillemot, P., Gatellier, B., and Rouveirolles, P., "The Influence of Coolant Temperature on Unburned Hydrocarbon Emissions from Spark Ignition Engine," SAE Technical Paper 941962, 1994, https://doi.org/10.4271/941962.
Pages:
13
Abstract:
A study has been initiated to understand the influence of coolant temperature on HC emissions employing a dual system cooling the cylinder head independently from the engine block. Especially, we have studied its influence on post-oxidation, fuel absorption-desorption, crevice volumes and fuel-air mixture preparation.The results show that the cylinder head temperature has more influence on HC emissions than the block temperature. It was also found that mixture preparation, absorption/desorption and crevice volumes with commercial gasoline is greatly improved by the cooling temperature. The post-oxidation process is also reduced for a decrease of the coolant temperature from 90°C to 35°C.
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