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Description

Woodward fuel metering skids consist of multipath metering legs, each individually

controlled by a Woodward metering valve to the various combustor manifolds or cans.

For each flow path, high-accuracy, high-bandwidth pressure-sensing transducers are

incorporated in the fluid path to measure pressure. Temperature-sensing devices

are also placed within the flow path to transmit the fuel temperature to the turbine control.

The combination of these signals with the engine flow demands to each leg allow

the turbine control to compute the valve positions necessary to provide the correct

flow to the engine. When integrated shutoff valves are incorporated, the skid can

isolate the pressure supply from the engine in the event of a system shutdown.

Vent connections are provided in various locations to allow a customer-connected

exhaust gas stack.

Installation

Woodward fuel skids are custom designed to fit into customer-specified turbine package 

envelopes. Easy drop-in capabilities help to reduce cost and time during installation.

Our fuel skids make compliance and quality inspections easy with the supplied detailed documentation.

Applications

Woodward Fuel Metering Systems or “Fuel Skids” are a complete fuel metering

product line incorporating the essential components needed for DLE engine

operation for industrial aeroderivative gas turbine platforms involved with

applications such as electrical power generation, gas compression,

and mechanical drive systems.

This fully validated, reliable, and simple drop-in solution is designed specifically

for rigorous DLE requirements.

Woodward system solutions provide high value-addedcontent at cost-effective prices.

Metering system products perform with all-electric valves and instrumentation

to eliminate the need for hydraulic or pneumatic input.

Woodward has established a pedigree of highly accurate flow metering valves and

instrumentation as well as highly effective system level solutions. Customers can

benefit from this expertise and expect high reliability, quality, service, and performance

from these products.

PG-07 CONTROL SYSTEM FEATURES

 Closed-loop control of air-fuel ratio improves equipment durability by reducing

maintenance, fuel consumption, and engine component wear.

 Control strategy ensures optimal transient performance for efficient system response.

 Comparisons of actual engine operation to expected values allow the system to

compensate for wear, tolerances and adverse operating environments. 

This improvement in operating economics is a result of the sophisticated software

models in the PG-07 system.

 Programmable idle speed control includes speed setpoint modifications for

coolant temperature and speed selector switch input.

 Monitoring and diagnostic communication via two CAN Bus interfaces

(J1939 protocol) allows immediate assessments and corrections either on-site or remotely.

 Individual diagnostic codes detect functional faults, intermittent faults, sensor

and actuator failures, and engine protection problems.

 Malfunction indicator lamp (MIL) annunciator allows instant analysis and troubleshooting.

 Extensive engine protection features include monitoring of engine coolant

temperature, oil pressure, and overspeed.

 Fault conditions can be calibrated to trigger a limited operating mode for

diagnostics and troubleshooting.

PG-07 controls the combustion process through sequential spark ignition. By driving

the smart coils, the system ignites the air-fuel mixture with precision timing

for optimal combustion, thus improving fuel efficiency. The rapid, high pressure,

more complete combustion yields an increase in torque and a decrease in

hydrocarbon emissions.

Gasoline engines (up to 4 cylinders)

The ECM and sensors provide the computational power, algorithm logic, sensor

inputs and control outputs to control the system. The ECM receives signals from

the sensors, digitizes these signals, and then through algorithms and

calibration maps computes the desired output response to manage

fuel, spark and air to the engine. The ECM also provides a variety of other

functions and features, including system monitoring and diagnostics to aid

in maintaining efficient system operation and auxiliary control.

All gasoline specific components are automotive production parts and

validated to strict automotive standards.

LPG and natural gas engines

An inline Woodward L-Series fuel trim valve controls fuel delivery based on a PWM

signal from the ECU.

The position of the trim valve biases the output pressure of the fuel flowing from

the regulator. The feedback voltage from the oxygen sensor determines

if the fuel delivery needs to be increased or decreased.

Sophisticated software modeling maintains optimum performance and response

throughout the life of the engine.

Gasoline engines (up to 4 cylinders)

The ECM and sensors provide the computational power, algorithm logic, sensor

inputs and control outputs to control the system. The ECM receives signals from

the sensors, digitizes these signals, and then through algorithms and

calibration maps computes the desired output response to manage

fuel, spark and air to the engine. The ECM also provides a variety of other

functions and features, including system monitoring and diagnostics to aid

in maintaining efficient system operation and auxiliary control.

All gasoline specific components are automotive production parts and

validated to strict automotive standards.

Sequential spark ignition

PG-07 controls the combustion process through sequential spark ignition. By driving

the smart coils, the system ignites the air-fuel mixture with precision timing

for optimal combustion, thus improving fuel efficiency. The rapid, high pressure,

more complete combustion yields an increase in torque and a decrease in

hydrocarbon emissions.

LPG and natural gas engines

An inline Woodward L-Series fuel trim valve controls fuel delivery based on a PWM

signal from the ECU.

The position of the trim valve biases the output pressure of the fuel flowing from

the regulator. The feedback voltage from the oxygen sensor determines

if the fuel delivery needs to be increased or decreased.

Sophisticated software modeling maintains optimum performance and response

throughout the life of the engine.

DESCRIPTION

PG-07 delivers precise and fully integrated control of fixed-speed, stationary industrial

engines.

Using proven, reliable components of Woodward’s MI-04 closed-loop control

system and the L-Series electronic throttle, PG-07 monitors and regulates

functions of the following engine subsystems.

Fuel Delivery

LPG, natural gas or gasoline

Spark-Ignition

Smart coils

Air

Electronic throttle

PG-07 commands full authority over spark, fuel, and air. This integrated approach

permits precise governing and air/fuel ratio control while remaining flexible enough

to handle transients. The control algorithms are model-based, feed forward,

adaptive strategies. Continual updates to the adaptive parameters allow

for more responsive control.

SYSTEM OVERVIEW

Components on LPG & NG Engines

 Electronic control module

 Electric fuel lock off solenoid valve

 Fuel pressure regulator*

 Fuel trim valve

 Fixed venturi mixer assembly

 Electronic throttle assembly

 Oxygen sensor

 Integrated temperature and manifold pressure sensor

 Smart coil

Components on Gasoline Engines

 Electronic control module and related sensors

 Fuel rail

 Fuel pressure regulator

 Fuel injectors

 Smart coil

(*) Two-stage pressure regulator/vaporizer on LPG liquid fuel systems

APPLICATIONS

Woodward’s PG-07 control system controls engines in generator sets, pumps,

and other stationary industrial equipment.It controls spark-ignited engines fueled by

LPG (vapor or liquid), natural gas and/or gasoline. Suitable for engines ranging in

size from 25 HP to 250 HP (1.0L to 8.1L). The highly accurate, closed-loop control

system helps OEMs and packagers comply with local emission standards

while providing discerning customers with advanced capability for remote monitoring

and control to reduce fuel consumption and increase engine life.

PG-07 provides accurate and reliable performance control over the service life

of the engine in the extreme operating environments typical of heavy-duty,

stationary industrial applications.

Optional Features

An oil cooler is recommended when governor oil temperature exceeds 99 °C (210 °F) or

governor drive shaft speed exceeds 1200 rpm on diesel or gas engines,

or 1100 rpm on steam turbines.

Air, oil, or water shutdown devices, either high or low pressure, are available for

engine protection. An energize or de-energize solenoid shutdown device is also

available.

For quick starts, a booster servomotor is available to supply immediate oil pressure

to the governor. This conserves engine starting air.

Preloaded buffer springs are available for governors used on gas engines and on

some engines driving reciprocating pumps.

Various base and power cylinder assemblies are available to conform to engine or

turbine manufacturer’s specifications.

Power servos may be mounted integrally on the governor with the terminal shaft in

either the 3. 6. 9. or 12 o’clock positions. Power servos also may be mounted

remotely from the governor. However, rotary power servos mount vertically only.