Mixture Preparation and HC Emissions of a 4-Valve Engine with Port Fuel Injection During Cold Starting and Warm-up 950074
In order to reduce tail-pipe hydrocarbon emissions from SI gasoline engines, rapid catalyst warm-up and improvement of catalyst conversion efficiency are important. There are many reports which have been published by manufacturers and research institutes on this issue. For further reduction of tail-pipe hydrocarbon emissions, it is necessary to reduce engine-out hydrocarbon emissions and to improve after treatment, during the time the catalyst is not activated.
This paper quantitatively analyzed the fuel amount of intake port and cylinder wall-wetting, burned fuel and engine-out hydrocarbon emissions, cycle by cycle in firing condition, utilizing a specially designed analytical engine.
The effect of mixture preparation and fuel properties for engine-out hydrocarbon emissions, during the cold engine start and warm-up period, were quantitatively clarified.
Citation: Takeda, K., Yaegashi, T., Sekiquchi, K., Saito, K. et al., "Mixture Preparation and HC Emissions of a 4-Valve Engine with Port Fuel Injection During Cold Starting and Warm-up," SAE Technical Paper 950074, 1995, https://doi.org/10.4271/950074. Download Citation
Toyota Motor Corp., Nippon Soken, Inc.
International Congress & Exposition
Advanced Developments in Ultra-Clean Gasoline-Powered Vehicles-PT-104, Progress in Fuel Systems to Meet New Fuel Economy and Emissions Standards-SP-1084, SAE 1995 Transactions: Journal of Engines-V104-3