midwest research institute - all-craft
TRANSCRIPT
Midwest Research InstituteSolutions through science
and technology
ANG Tank Design and Fuel
Delivery System
7/20/05
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Fuel Delivery System
Requirements
• Integrate an ANG delivery system that stillallows operation using CNG
• Electrical/Control
– Ability to operate on a 12V system
– Recognition of ANG tank operation
– Operational status feedback to driver indicatingoperation on CNG or ANG
– Storage of test data during operation (mileage,tank fill level, etc)
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• Mechanical
– Manual fuel delivery shut off
– Margin of safety of 4 on pressure vessel (i.e.operational pressure of 500 psi, design pressureof 2000 psi)
– Minimize weight of hardware
– Tank over-pressurization valves must be installed
– Integrated fuel delivery system shall becompatible with 2001-2005 Honda Civic
– A guard bed will be incorporated for filtration ofhydrocarbons and heavier gases
Fuel Delivery System
Requirements
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ANG Design
Guard Bed
Guard Bed HeaterControl
ANG TankCasing
Approx. Usable Space OutlineCNG
Fuel Filter
(pre-existing)
ANG Tank Tube
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Assembly Specifications
• ANG Tank, Guard bed, casing tobe made from Al 6061-T6
• ANG Volume = 34 L (9 gal)
• CNG Volume = 100 L (26.4 gal)
• Assuming 150 V/V for ANG, tankis depleted after ~42 miles
• Guard Bed Volume = 0.95 L(0.25 gal), 3 % of ANG volume
• Total added assembly ~150 lbs
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Test Fixture
Pressure ReliefValve
Supply Tank (1,000 psi, 2.25 L)
PressureRegulator
Pressure Transducerand Gauge
Thermocouple
ANG Tank (500 psi, 0.5 L)
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Fuel System Schematic
Intake Manifold
CNG Tank
Fuel Rail andFuel Injectors
PressureRegulator 1
Pressure Regulator 2
Engine
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P
T
Fuel Injectors
T P
3600psi
500psi
3600psi
193psi
193psi
47psi
500psi
47psi
Output DataMileage
Traveled DistanceANG Drain TimeANG Fill Time
MileageCNG TCNG P
Basic Fuel and
Electrical System Schematic
Fuel valve
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Relief Line
Fill Line
Fill
Lin
e
3600psi
193psi
193psi
47psi
Relief Valve
1
All insertions in orange are additions of
ANG system
Fuel Tank Temperature SensorFuel Tank Pressure Sensor
321
Fuel Pressure Regulator
Fuel Pressure Sensor
Line Connection with on off valve
Fuel Injectors
Reference Supplement page 11-29
For all black lines and green insertions
Intake
Manifold
4
4
2
P
T
G B
3
4
3
Manual Shut Off Valve
Fuel and Electrical System
Schematic
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321
4Fuel Pressure Regulator
Fuel Pressure Sensor
Line Connection with on off valve
Fuel Tank Pressure Sensor
Fuel Tank Temperature SensorReference Supplement page 11-29
For all black lines and green insertions
All insertions in orange are additions of
ANG system
Blue includes computers and electrical
wiring for current CNG system only
Injector Control Module (ICM)
Powertrain Control Module (PCM)
On Off fuel tank fuel switch
Fuel and Electrical System
Schematic contd
G B 1
3
4
Fuel Injectors
Relief Line
Fill
Lin
e
Fill Line
Relief Valve
Fuel temperature Sensor
4
Intake
ManifoldManifold Absolute Pressure
(MAP) Sensor
2
3
P
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3
21
4
Fuel Pressure Regulator
Fuel Pressure Sensor
Line Connection with on off valve
Fuel Tank Pressure Sensor
Fuel Tank Temperature Sensor
Reference Supplement page 11-29
For all black lines and green insertions
All insertions in orange are additions
of ANG system
Blue includes computers and electrical
wiring for current CNG system only
Injector Control Module (ICM)
Powertrain Control Module (PCM)
On Off fuel tank fuel switch
Pink includes computers and electrical
wiring for new ANG system only
Fuel and Electrical System
Schematic contd
G B 1
3
4
Fuel
Injectors
Relief Line
Fill
Lin
e
Fill Line
Relief
Valve
Fuel temperature Sensor
4
Intake
ManifoldManifold Absolute Pressure(MAP) Sensor
2
3
P
T
InteriorANG Light
3
3
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Computer Flow Chart
ANG = 100psi
or greater
Check ANG
Tank
Run CNG
and fill ANG
Run ANG
Tank
Yes
Calculate
ANG fill time
Open CNG valve
Close ANG valve
Open CNG valve
Close ANG valve
ANG = 500 psi
Calculate
ANG drain time
and travel distance
Recognize
On Ignition
Turn on ANG
Interior LED
Check
ANG Sensor’s
Pressure
ANG sensor’s
Pressure OK
Run CNG Tank
Run ANG
Store
ANG fill time
Yes
ANG = 100psi
or greater
Check
ANG tank
Open ANG valve
Close CNG valve
Store
ANG drain time
and travel distance
Yes
Are
Calculations
Being performed
Yes
Turn off ANG
Interior LED
Yes
No
No
No
No
No Yes
Yes
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