27-jun-03030702 b&s arb workshop comments evaporative emissions control technology – an engine...
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27-Jun-03 030702 B&S ARB Workshop Comments
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
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27-Jun-03 030702 B&S ARB Workshop Comments
Sealed Tank Systems
Fuel Cap 1999 Mazda 626
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27-Jun-03 030702 B&S ARB Workshop Comments
Sealed Tank System Characteristics
• Tank Pressure Control Valve
• Pressurized fuel tank
• Tank Pressure-Vacuum Relief Mechanism
• Fuel lines and connectors
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27-Jun-03 030702 B&S ARB Workshop Comments
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
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27-Jun-03 030702 B&S ARB Workshop Comments
WBM Fuel System Spatial Relationships
Brake
Brake
BrakeFuel Tank
Fuel Tank
Fuel Tank
Carburetor
Carburetor
Carburetor
Briggs & Stratton
Briggs & Stratton
Tecumseh
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27-Jun-03 030702 B&S ARB Workshop Comments
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
5.0 psig spray
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27-Jun-03 030702 B&S ARB Workshop Comments
Tank Deformation Under PressureQuantum Mod Fuel Tank 498956
Deformation Due to Internal Pressure
0.000
0.100
0.200
0.300
0.400
0.500
0.600
0.700
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Pressure [psig]
Dis
pla
ce
me
nt
[in
]
Point A
Point B
Point C
Point D
Point E
Point F
Point G
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27-Jun-03 030702 B&S ARB Workshop Comments
Residual Tank Deformation5 Minutes After Pressure Relief
Quantum Mod Fuel Tank 498956Residual Deformation After Relief of Internal Pressure
0.000
0.050
0.100
0.150
0.200
0.250
0.300
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Pressure [psig]
Dis
pla
ce
me
nt
[in
] Point A
Point B
Point C
Point D
Point E
Point F
Point G
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27-Jun-03 030702 B&S ARB Workshop Comments
Tank Deformation at 3.0 psig
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27-Jun-03 030702 B&S ARB Workshop Comments
Tank Deformation at 5.0 psig
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27-Jun-03 030702 B&S ARB Workshop Comments
Automotive Fuel TankPressure-Vacuum Relief Cap
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27-Jun-03 030702 B&S ARB Workshop Comments
Automotive Fuel Cap (New)Air Flow vs. Gage Pressure
-300
-100
100
300
500
700
-1.00 -0.50 0.00 0.50 1.00 1.50 2.00 2.50
Pressure (psi)
Flo
w (
sc
cm
)
Stant 11806 CAP034
Stant 11806 CAP035
Stant 11817 CAP036
Stant 11819 CAP037
Pressure –Vacuum Relief Performance
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27-Jun-03 030702 B&S ARB Workshop Comments
Duckbill - High Pressure Flare Valve Fuel Cap Cracking Pressure Histogram
0
2
4
6
8
10
12
2.2 2.6 3.2 3.6 4 4.6 5.2 5.6 6
Cracking Pressure (psi)
Fre
qu
ency
Note - On some of the caps, the pressure to leak off during the first testing was excessive ( 7-9 psi ), but after retesting the values became more consistent. For these trials, the retest numbers where used in the graph. All caps tested where virgin Walbro -Robin caps with no fuel exposure.
Duckbill - High Pressure Flare Valve
Mean = 3.866 psi Standard Deviation = 0.81 psi Coefficient of Variance = 20.9%
Pressure Relief – 30 Part Population
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27-Jun-03 030702 B&S ARB Workshop Comments
Pressure Relief – After SoakDuckbill - High Pressure Flare Valve Fuel Cap
Cracking Pressure (Before and After 5 Hour Gasoline Soak)
0
1
2
3
4
5
A B C D E F G
Part ID
Cra
ckin
g P
ress
ure
New Caps
After 5 Hour Soak
Note - 5 psi was the maximum pressure introduced to the caps. After 5 psi was reached, the caps where considered to have no leakoff.
Duckbill - High Pressure Flare Valve
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27-Jun-03 030702 B&S ARB Workshop Comments
Pressure Relief – Umbrella Valves
Data available Monday, 6/30.
Will show cracking pressure in10 piece population before and after Cert fuel soak.
Umbrella Valve Cracking PressureBefore and After Fuel Soak
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
#01 #02 #03 #04 #05 #06 #07 #08 #09 #10
Valve
PS
I
Before Soak
After Soak
65 hour soak in Cal Ph2 Cert Fuel
+/- 3 Sigma Design Criteria
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27-Jun-03 030702 B&S ARB Workshop Comments
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
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27-Jun-03 030702 B&S ARB Workshop Comments
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
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27-Jun-03 030702 B&S ARB Workshop Comments
J2260 Tubing and Connectors
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27-Jun-03 030702 B&S ARB Workshop Comments
Packaging Constraints - Fuel LineWBM Engine – Line Routing and Interferences
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27-Jun-03 030702 B&S ARB Workshop Comments
Automotive Fuel Cap Warnings
Subaru Forrester
Dodge Neon
Pontiac Montana
Ford Ranger
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27-Jun-03 030702 B&S ARB Workshop Comments
Automotive Fuel Fill Neck
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27-Jun-03 030702 B&S ARB Workshop Comments
Small Off-Road Engine Fuel Fill Neck B&S 6.5 Hp Vertical Shaft
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27-Jun-03 030702 B&S ARB Workshop Comments
Small Off Road Engine Fuel Fill Neck B&S 8 hp Horizontal Shaft
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27-Jun-03 030702 B&S ARB Workshop Comments
Small Off-Road Engine Fuel Fill NeckM9/10
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27-Jun-03 030702 B&S ARB Workshop Comments
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
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27-Jun-03 030702 B&S ARB Workshop Comments
Evaporative Controls TestingIndustry Capabilities