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DESIGN CONSIDERATIONS FOR THE APPLICATION OF AIR ASSISTED DIRECT IN-CYLINDER INJECTION SYSTEMS
Technical Paper
978452
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English
Abstract
Air Assisted Direct in-cylinder injection systems have now been in commercial production for over 18 months in large two-stroke outboard applications, offering the customer the advantage of emissions control, significant fuel economy improvements, smooth and misfire-free operation and improved driveability.
With the pending implementation of emission controls in most two-stroke engine applications, the fuel system of choice must be capable of being adapted in a short time period to a new or given application. Over the last three years, the air assisted direct injection system has been successfully applied across a range of cylinder displacements from 50 to 500cc. In all applications, the in-cylinder injection system's hardware has been maintained common in order to share in the benefits of economies of high volume production.
As the emissions targets are generally not as stringent as those called for in today's and future automotive engine requirements, the design requirements become product specific, defined by performance and the cost targets.
This paper provides an overview of what has been achieved on the production of the Mercury Marine Optimax low emission two-stroke outboard utilising Orbital technology on the 3.0L 200DFI model. The authors also discuss some of the design considerations across a variety of both demonstration and commercially released recreational and motorcycle applications.
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Citation
Worth, D., Coplin, N., McNiff, M., and Stannard, M., "DESIGN CONSIDERATIONS FOR THE APPLICATION OF AIR ASSISTED DIRECT IN-CYLINDER INJECTION SYSTEMS," SAE Technical Paper 978452, 1997.Also In
References
- Environmental Protection Authority 40 CFR Parts 89 90 91
- Houston R et al Development of a Durable Emissions Control System for an Automotive Two-Stroke Engine SAE 960361
- Bell G et al Exhaust Emissions Sensitivities with Direct Injection on a 50 cc Scooter SAE 970365
- Schlunke K The Orbital Combustion Process Engine 10th Vienna Motorsymposium 1989 63 68
- Smith D et al The Orbital Ultra Low Emissions and Fuel Economy Engine 14th Vienna Motorsymposium 1993 203 229