Category: Woodward

Description

The LQ6 incorporates an electrically actuated rotary metering valve, a bypassing

regulator, and an on-board driver module. These components are packaged within a

common assembly to reduce cost and improve performance.

Highly accurate flow control is achieved by the use of a rotary plate element,

embodying a precision-machined metering port. A seal shoe is loaded against the

plate to achieve accurate flow area control over a wide range. The self-cleaning,

shear-type action keeps the metering port free from contaminant deposits and

system debris.

The metering section utilizes a single moving part with the valve plate, actuator rotor,

and position feedback resolver mounted on a single shaft. Accurate flow versus input

signal characteristics are achieved by the precision machining of the valve metering

port, the use of large valve travels, and a high-precision resolver for valve position

feedback. The LQ valve can achieve flow turn-down ratios in excess of 100 to 1.

The pressure differential across the metering valve port is held virtually constant by a

bypassing-type regulator. When this pressure difference exceeds the selected level,

the regulator piston progressively opens to bypass excess inlet flow back to the fuel

pump inlet area. This pressure regulation system requires the use of a positive

displacement, high-pressure fuel pump upstream of the LQ6 valve.

The use of rare-earth permanent magnets in an efficient electromagnetic circuit

results in high actuation forces while minimizing package size. The closely integrated

mechanical design eliminates backlash and provides virtually infinite valve

positioning resolution.

Applications

The LQ6 provides the flow range, accuracy, and response characteristics

necessary for the control of industrial gas turbines in the 3 MW to 15 MW

power range. By integrating Woodward’sproprietary electric actuation technology

with a proven fuel-metering concept, exceptional performance androbustness

are achieved in a compact, cost effective package. The use of on board driver

electronics simplifies system design and reduces installation space, time, and cost.

Please refer to Woodward Installation and Operation Manual 26515 for complete

details of this product, its application and installation.

The use of rare-earth permanent magnets in an efficient electromagnetic circuit

results in high actuation forces while minimizing package size. The closely integrated

mechanical design eliminates backlash and provides virtually infinite valve

positioning resolution.

Common P1

Common P1 is a cost reduction feature that utilizes a compensation model to optimize

the skid performance to a particular engine flow profile. The model algorithms predict

multi-path pressure losses simultaneously in the piping to reduce the number of pressure-sensing

elements required in the system from as many as 20 sensors to 12.

The model maintains system-sensing redundancy and system pressure measurement accuracy.

Ask Woodward how this solution can be applied to your system for pressure-sensing cost reductions.

System Integration Capabilities

Systems Analysis

 Numerical Analysis:

 CFD—Computational Fluid Dynamics

 FEA—Finite Element Analysis of system parameters

 Design-to-cost product optimization

 Algorithm validation for third-party control implementation

 Utilize the Woodward platforms or your control platform

 Applied system knowledge of DLE engine operation

 System FMEA and risk analysis

Integrated Solutions

Woodward offers world class integration features of OEM-qualified Woodward products and

commercial catalog components to minimize the burden of customer sourcing labor.

 High speed shut-off valves

 Integrated sensing elements

 Custom and standard cable, connector, and interconnect solutions

 Built-in redundancy

 Localized customer junction and terminal enclosures

Product Differentiators

Pedigree

Woodward has over 20 years of design and system level control experience for aeroderivative 

fuel metering systems, with over 250 units in the field. Our goal is to supply durable,

high quality and reliable Woodward metering technologies. Woodward fuel metering systems

incorporate customer-focused design solutions to enable a winning

combination of speedy time to market and drop-in turnkey products to meet customer needs.

Our engineering capabilities range from customizable hardware designs to system-level optimization

analysis.

Woodward has in-house dynamic and steady-state flow testing in our state-of-the-art flow facility to fulfill

rigorous technical qualification requirements.

Product Features

 High accuracy, high precision metering technologies

 Digital communications allowing interface to multiple customer engine control platforms with 

the highest level of accuracy

 High-speed real-time synchronous control capabilities

 All-electric products

 Scalable, modular, customizable, compact

 Designed for ease of maintenance and access

 Alternative fuels—Capable of metering blended and low-energy fuels

Compliance

Woodward has exceptional competencies in conforming and understanding industrial

hazardous location compliance and installation practices for most regulating entities.

Common P1

Common P1 is a cost reduction feature that utilizes a compensation model to optimize

the skid performance to a particular engine flow profile. The model algorithms predict

multi-path pressure losses simultaneously in the piping to reduce the number of pressure-sensing

elements required in the system from as many as 20 sensors to 12.

The model maintains system-sensing redundancy and system pressure measurement accuracy.

Ask Woodward how this solution can be applied to your system for pressure-sensing cost reductions.

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.