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California Off-road Mobile Source Technology Review JOHN DEERE LE ENGINE TECHNOLOGY

This review explores the benefits and features of John Deere's LE Engine Technology for off-road mobile sources. The technology offers lower emissions, improved fuel consumption, and comparable performance to other direct-injected two-stroke options. It is also adaptable to larger engines.

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California Off-road Mobile Source Technology Review JOHN DEERE LE ENGINE TECHNOLOGY

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  1. California Off-road Mobile Source Technology ReviewJOHN DEERE LE ENGINE TECHNOLOGY John Deere Consumer Products February 2, 2000

  2. Handheld Products

  3. Emissions Performance * * Certification value for Deere 125-hour engine

  4. Certification • Certified for durability period of 125 hours • Required same level of maintenance as current 25 cc engine • No catalyst to replace • No valve train, so no need for lash adjustment • Power was constant at .95 hp • DF of 1.1 • Low NOx of less than 2 g/hp-hr • Fuel efficient with low CO2

  5. Fuel Consumption

  6. LE Technology Component Comparison Between JDCP & Standard Two stroke • Injector • Injection Tube StandardJDCP LE Engine

  7. JDCP 25 cc Engine Prototype LE 25 cc Engine Standard 25 cc Engine

  8. Low Emission Engine Technology Fuel & air is drawn into crankcase Only Air is drawn into crankcase

  9. Low Emission Engine Technology Crankcase is filled with air/fuel Crankcase is filled with air while mixture injection tube draws fuel

  10. Low Emission Engine Technology Air/fuel mixture compressed in Air is compressed in crankcase crankcase and fuel is compressed in injection tube

  11. Low Emission Engine Technology Air/fuel mixture is forced through Only air is forced through transfer transfer ports into combustion ports into combustion chamber chamber. Expansion gases compress fuel in injection tube.

  12. Low Emission Engine Technology Air/fuel mixture escapes through Fuel injection starts. Only air exhaust port through exhaust

  13. Lubrication • Introduces small portion of fuel/oil mixture into the crankcase • Operates in high viscosity oil mist environment versus standard flooded condition • No bearing failures or evidence of poor lubrication

  14. Fuel Delivery System • Current fuel systems are based on the standard carburetor and address all operating modes of the engine

  15. Vacuum Fuel System for Compressed Air Assisted Injection System Fuel System

  16. Power • LE prototypes of same displacement (25 cc) engines have demonstrated equivalent and improved power • 25 cc LE engine produces almost 1 horsepower • Power can be tailored using conventional engine design criteria • Port timing and size • Fuel system venturi/throttle bore size

  17. Weight • Additional weight is insignificant • LE parts adds about 40 grams (less than 2 ounces)

  18. Ambient Temperature Operation • LE engine provides same operating performance as current carbureted engines across wide range of ambient temperatures

  19. Engine Temperatures • No “new” heat management issues are presented with the LE Technology • Good initial designs for heat management, as with typical commercial engines, will have fewer or no heat problems • Engineering solutions are readily available • LE engine certified at 125 hours of operation, demonstrating no heat problems

  20. Manufacturability Requires only • Minimal cylinder modification • New fuel delivery system, which will be commercially available • Miscellaneous hardware LOW COST SOLUTION

  21. Advantages • Lower cost • Lower fuel consumption • Comparable performance to other direct injected two stroke technologies • Lower NOx, CO & CO2 than 4 stroke technology • Adaptable to larger displacement engines

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