Direct Fuel Injection

Direct Fuel Injection - 1 Arun Solomon GM R&D...

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Unformatted text preview: 1 Arun Solomon GM R&D Center DIRECT-FUEL-INJECTION GASOLINE ENGINES Arun Solomon General Motors R & D and Planning Powertrain Systems Research Laboratory Michigan State University Michigan State University College of Engineering College of Engineering ME 444 Fall 2010 2 Arun Solomon GM R&D Center OUTLINE OUTLINE Historic evolution of fuel delivery systems for gasoline engines Direct-fuel-injection - benefits Past direct-injection stratified-charge (DISC) engine programs Why revisit the DISC engine? The modern gasoline direct-injection engine Summary and conclusions 3 Arun Solomon GM R&D Center Gasoline-Engine Fuel Delivery Systems Gasoline-Engine Fuel Delivery Systems 1900 1985 Carburetor 1980 1995 Single-Point, Throttle-Body Fuel Injection 1980 ???? Multi-Port-Fuel-Injection 1995 ???? Advanced Multi-Port-Fuel-Injection 1996 ???? Direct (In-Cylinder) Fuel-Injection 4 Arun Solomon GM R&D Center Carburetor Port-Fuel-Injection Direct-Injection 5 Arun Solomon GM R&D Center A Typical Reverse-Tumble Wall-Controlled A Typical Reverse-Tumble Wall-Controlled Direct-Injection Gasoline Engine Direct-Injection Gasoline Engine Vertical Intake Ports that Generate Reverse-Tumble AirFlow Direct-Fuel Injector Spark Plug Piston with Bowl to Aid in Creation of Suitable Fuel-Air Mixture 6 Arun Solomon GM R&D Center Historic Evolution of Gasoline-Engine Historic Evolution of Gasoline-Engine Fuel Delivery Systems Fuel Delivery Systems The evolution of gasoline-engine fuel delivery systems has been dictated by the need to improve transient and cold engine performance and emissions. With each evolutionary change in the fuel delivery system, air-fuel mixture preparedness, within the cylinder, had to be engineered and restored to the traditionally acceptable homogeneous state. 7 Arun Solomon GM R&D Center Gasoline-Engine Fuel Delivery Systems Gasoline-Engine Fuel Delivery Systems Fuel System Carburetor Single-Point, Throttle-Body Fuel Injection Multi-Port-Fuel-Injection Advanced Multi-Port-Fuel-Injection Direct-Fuel-Injection Transient Emissions & Control * * * * * * * * * * * * * * * Cold Emissions & Control * * * * * * * * * * * * * * * Mixture Preparation Quality * * * * * * * * * * * * * * * * Cost & Complexity * * * * * * * * * * * * * * * 8 Arun Solomon GM R&D Center Carburetor to EFI Turnover (Artist's Impression) 20 40 60 80 100 1960 1970 1980 1990 2000 2010 2020 year percent Carburetor EFI Direct-Injection??? Will direct-fuel-injection replace electronic port-fuel-injection at a similar rate? 9 Arun Solomon GM R&D Center Direct-Fuel-Injection - Preliminary Goal Direct-Fuel-Injection - Preliminary Goal Preliminary goal for a Direct-Fuel-Injection system is therefore to be able to achieve the traditionally acceptable homogeneous air-fuel mixture state at the time of ignition, by: Promoting maximum air-fuel mixing Using a finely atomized spray Prevent wall wetting Injecting early during intake stroke Intake-port design Injector location 10...
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Direct Fuel Injection - 1 Arun Solomon GM R&D...

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