This content is not included in your SAE MOBILUS subscription, or you are not logged in.
SCIP Simplified Direct Injection for Low Emissions Small Two-Stroke Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 28, 1999 by SAE International in United States
Annotation ability available
The IAPAC Direct fuel Injection (DI) system, developed by IFP, has already well proven its capability to reduce pollutants emissions and fuel consumption of 2-stroke engines. This crankcase Compressed Air Assisted Fuel Injection Process allowing the introduction of the fuel separately from the scavenging air, minimizes the fuel short-circuiting.
In earlier works, results of the implementation of the IAPAC system on cylinder displacement from 125 cc to 400 cc have been presented in various papers. These first prototypes were all using a camshaft to drive the IAPAC DI poppet valve, which was considered as a limitation for applying this system to small displacement 2-stroke engines.
The new SCIP™ system is no more using a camshaft neither driveshaft, or any electric power supply to drive the DI air assisted injection valve. The IAPAC poppet valve used for low pressure air assisted direct injection of fully atomized fuel, is here mechanically actuated by a diaphragm driven by pressures from the engine. The SCIP air assisted injector unit can be easily bolted on existing 2-stroke cylinder heads with minimum engine intrusion and redesign.
To be combined with the SCIP technology and hardware, Sagem has developed a low cost Engine Management System (EMS) including low pressure mass produced Electronic Fuel Injection (EFI) components for fuel metering. The key features of the Sagem MC 500 SCIP system are described in details. It also includes additional enhancement capabilities, such as lubrication oil control, vehicle anti-theft,…
After preliminary development and endurance testing carried out on a 125 cc 2-stroke scooter engine and described in a previous paper, the SCIP system has been applied to a 50 cc scooter engine and to a 125 cc small marine outboard for demonstration. The results obtained with these two proof of concept prototypes are described and show the SCIP capability to meet future European 2-wheeler as well as US EPA 2006 marine outboards emissions regulations while maintaining driveability and performance characteristics.
Combined with the SAGEM-developed MC 500 Engine Management System for small engines, the SCIP system appears therefore as a simple and highly efficient way to reduce pollutant emissions and fuel consumption of small 2-stroke engines.
|Technical Paper||High Speed Fuel Injection System for 2-Stroke D.I. Gasoline Engine|
|Technical Paper||The Effects of Crankcase Oil Viscosity on Engine Friction at Low Temperatures|
|Technical Paper||Heat Insulated Turbocompound Engine|
CitationDuret, P., Lavy, J., Venturi, S., and Allen, C., "SCIP Simplified Direct Injection for Low Emissions Small Two-Stroke Engines," SAE Technical Paper 1999-01-3289, 1999, https://doi.org/10.4271/1999-01-3289.
- DURET P. ECOMARD A. AUDINET M. A New Two-Stroke Engine with Compressed Air Assisted Fuel Injection for High Efficiency Low Emissions Applications SAE 880176
- MONNIER G. DURET P. PARDINI R. NUTI M. IAPAC Two-Stroke Engine for High Efficiency Low Emissions Scooters 3 rd SETC Conference December 1993 Pisa (Italy)
- DURET P. DABADIE J.C. COLLIOU T. Application of IAPAC Fuel Injection for Low Emissions Small Two-Stroke Engines 4th SETC Conference - SAE 951785
- DURET P. VENTURI S. Automotive Calibration of the IAPAC Fluid Dynamically Controlled Two-Stroke Combustion Process SAE 960363
- ISHIBASHI Y. ASAI M. An Experimental Study of Stratified Scavenging Activated Radical Combustion Engine SETC'97 Yokohama Japan
- DABADIE JC. DURET P. VENTURI S. SCIP: a New Simplified Camless Direct Injection for Low Emission Small Two-Stroke Engines SETC'97 Yokohama Japan JSAE 9734115 - SAE 972078
- BELL G. FINUCCI C. Exhaust Emissions Sensitivities with Direct Injection on a 50cc Scooter SAE 970365
- NUTI M. PARDINI R. CAPONI D. FAST Injection System: PIAGGIO Solution for ULEV 2T SI Engines SAE 970362
- HEIMBERG W. Ficht pressure surge injection system 3 rd SETC Conference December 1993 Pisa (Italy)
- Federal Register 59 216 November 9 1994 Proposed Rules Environmental Protection Agency
- COATES S.W. LASSANSKE G.G. Measurement and Analysis of Gaseous Exhaust Emissions from Recreational and Small Commercial Marine Craft SAE 901 597
- Test Procedure for the Measurement of Exhaust Emissions for Marine Engines 1989