Reduction of HC Emission from VTEC Engine During Cold-Start Condition

Paper #:
  • 940481

Published:
  • 1994-03-01
Citation:
Nakayama, Y., Maruya, T., Oikawa, T., Fujiwara, M. et al., "Reduction of HC Emission from VTEC Engine During Cold-Start Condition," SAE Technical Paper 940481, 1994, https://doi.org/10.4271/940481.
Pages:
12
Abstract:
In the cities of the U.S. the worsening ozone problem has attracted attention and prompted reinforcement of regulations against emissions of hydrocarbons (HC) from automobiles. To cope with this situation, a reduction of HC is a vital challenge for the automotive industry. HC emission comes mainly from a cold engine, which usually uses a richer air-fuel mixture to achieve stable combustion and secure good driveability.The purpose of this paper is to show that using a engine with variable valv1e timing and lift system (VTEC) (1)∼(2) it is possible to reduce considerably HC emission in cold-start conditions. In other words, it is able to employ a leaner mixture than in existing engines (A/F=15.5) by using the VTEC system to alter the valve timing and lift according to various driving conditions, thereby considerably reducing HC emissions due to the improvement and stabilization of engine combustion.
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