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

T

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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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