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Evaporative Emissions Control Technology – An Engine Manufacturer’s Perspective

Evaporative Emissions Control Technology – An Engine Manufacturer’s Perspective. Two Threshold Design Issues: Pressurized Fuel Systems? Metal or Treated Plastic Tank? Implementation Issues: Lead-time for new fuel systems Equipment integration issues. Fuel Cap 1999 Mazda 626.

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Evaporative Emissions Control Technology – An Engine Manufacturer’s Perspective

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  1. Evaporative Emissions Control Technology – An Engine Manufacturer’s Perspective • Two Threshold Design Issues: • Pressurized Fuel Systems? • Metal or Treated Plastic Tank? • Implementation Issues: • Lead-time for new fuel systems • Equipment integration issues 030702 B&S ARB Workshop Comments

  2. Fuel Cap 1999 Mazda 626 Sealed Tank Systems 030702 B&S ARB Workshop Comments

  3. Sealed Tank System Characteristics • Tank Pressure Control Valve • Pressurized fuel tank • Tank Pressure-Vacuum Relief Mechanism • Fuel lines and connectors 030702 B&S ARB Workshop Comments

  4. Tank Pressure Control Valves • Require dual vent and fuel shut-off valves • Isolate of carburetor from high pressures • Sequential valve actuation – start and hot restart performance? • Automatic valve actuation mechanism • Engine brake bail only on WBM • Blade-brake clutch solution? • Other application solution? • Spatial relations or packaging limitations 030702 B&S ARB Workshop Comments

  5. WBM Fuel System Spatial Relationships Carburetor Brake Carburetor Fuel Tank Carburetor Brake Fuel Tank Fuel Tank Brake Briggs & Stratton Tecumseh Briggs & Stratton 030702 B&S ARB Workshop Comments

  6. 5.0 psig spray Tank Pressurization Concerns • Fatigue failure consequences • Crack sprays – increased risk for uncontrolled liquid fuel release if cracks occur • Pressurized tanks will be less forgiving under impact conditions • Tank deformation 030702 B&S ARB Workshop Comments

  7. Tank Deformation Under Pressure 030702 B&S ARB Workshop Comments

  8. Residual Tank Deformation5 Minutes After Pressure Relief 030702 B&S ARB Workshop Comments

  9. Tank Deformation at 3.0 psig 030702 B&S ARB Workshop Comments

  10. Tank Deformation at 5.0 psig 030702 B&S ARB Workshop Comments

  11. Automotive Fuel TankPressure-Vacuum Relief Cap 030702 B&S ARB Workshop Comments

  12. Pressure –Vacuum Relief Performance 030702 B&S ARB Workshop Comments

  13. Pressure Relief – 30 Part Population 030702 B&S ARB Workshop Comments

  14. Pressure Relief – After Soak 030702 B&S ARB Workshop Comments

  15. Pressure Relief – Umbrella Valves Data available Monday, 6/30. Will show cracking pressure in10 piece population before and after Cert fuel soak. 030702 B&S ARB Workshop Comments

  16. Pressure-Vacuum Relief Valves Summary • Commercially available fuel system pressure-vacuum relief valves: • Not binary (leak before relief) • Relief pressures are inconsistent • Fuel exposure affects valve performance 030702 B&S ARB Workshop Comments

  17. Fuel Hose and Connection Reliability Summary • Pressurized fuel systems will introduce stresses to fuel system connections • Reduced reliability • Fuel spray possible at failure • Gross-emitters • Operator Risk • Maintenance and Repair Risk 030702 B&S ARB Workshop Comments

  18. J2260 Tubing and Connectors 030702 B&S ARB Workshop Comments

  19. Packaging Constraints - Fuel Line WBM Engine – Line Routing and Interferences 030702 B&S ARB Workshop Comments

  20. Pontiac Montana Dodge Neon Ford Ranger Subaru Forrester Automotive Fuel Cap Warnings 030702 B&S ARB Workshop Comments

  21. Automotive Fuel Fill Neck 030702 B&S ARB Workshop Comments

  22. Small Off-Road Engine Fuel Fill Neck B&S 6.5 Hp Vertical Shaft 030702 B&S ARB Workshop Comments

  23. Small Off Road Engine Fuel Fill Neck B&S 8 hp Horizontal Shaft 030702 B&S ARB Workshop Comments

  24. Small Off-Road Engine Fuel Fill NeckM9/10 030702 B&S ARB Workshop Comments

  25. Vapor Release Management • Challenges are more acute than those encountered in other industries • Short fill necks • Tight packaging • Thermal management of exhaust and catalyst • Angle of operation • Refueling 030702 B&S ARB Workshop Comments

  26. Evaporative Controls TestingIndustry Capabilities 030702 B&S ARB Workshop Comments

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