2001 Vehicle Technologies Symposium - Intelligent Systems for the Objective · PDF...

Drive-By-WireTechnology

Presented By:Chris DoellMPC Products CorporationEngineering ManagerGround Vehicle Actuation Control Systems

2001 Vehicle Technologies Symposium - Intelligent Systems for the Objective Fleet

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Report Date 29May2001

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Title and Subtitle Drive-By-Wire Technology

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Author(s) Doell, Chris

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Performing Organization Name(s) and Address(es) MPC Products Corporation Engineering ManagerGround Vehicle Actuation Control Systems

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Sponsoring/Monitoring Agency Name(s) and Address(es) NDIA (National Defense Industrial Assocation) 211Wilson BLvd., Ste. 400 Arlington, VA 22201-3061

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Distribution/Availability Statement Approved for public release, distribution unlimited

Supplementary Notes Proceedings from 2001 Vehicle Technologies Symposium - Intelligent Systems for the Objective Force29-31 May 2001 Sponsored by NDIA, The original document contains color images.

Abstract

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Number of Pages 17

Drive-By-Wire Technology

2001 Vehicle Technologies SymposiumIntelligent Systems for the Objective Fleet

Topics•What is Drive-By-Wire (DBW) Technology?•MPC Products Ground Vehicle Heritage•Pros and Cons of DBW•DBW Applications in Ground Vehicles•Conclusion

MPC Products Corporation



What is Drive-By-Wire Technology?


uDrive-By-Wire technology is the incorporation ofelectrical devices to supplant the use of mechanicallinkages within a vehicle.

uThis implementation can use electrohydrostatic,electropneumatic, or electromechanical. The focus ofthis discussion will be on electromechanical actuationsystems.




Drive-By-Wire Heritage

Crusader Artillery VehicleVetronics Technology Testbed8x8 Advanced Hybrid Electric Drive



Crusader Heritage

Service Brake Actuatorand Controller

Parking Brake Actuator

Steering Actuator

Cooling Fansand Controller

Geared and Non-gearedResolvers

Driver’s Yoke



position command

yoke steeringcommand

fault status

position feedback

angulardisplacementinput (±30°)

position feedback

position command

yoke brakecommand

brake handle input(+15°)

STEERING

SERVICEBRAKE

yoke input

yoke input

YOKE CONTROLLER ACTUATOR

VehicleComputers

lineardisplacement

lineardisplacement

Crusader Simplified System Diagram

Command Inputs

•Single channel shown for simplicity.•This is a (2) channel electrically redundant system, withan auto-switchover feature, latching a mastercaution/warning in the crew compartment.

throttledisplacement

(±90°)

30 lbf max output force6.00 in/sec rate3.000 in stroke

250 lbf max output force2.60 in/sec rate2.322 in stroke



STEERING

SERVICEBRAKE

YOKE CONTROLLER ACTUATOR

Vehicle Power28 VDC

Crusader Simplified System Diagram

Power Inputs

(2) Channel



Vehicle GPU(General Processing Unit)

Vehicle SAIU(Servo AmplifierInterface Unit)

Vehicle Power

28vdc power

fire switchdeadman railmenu select +/-select switchesjoystick positionpush-to-talk (discrete)

brake enable (discrete)throttle positiondeadman railfocus +/-field switchesjoystick positionsteering

brightness level

led on/offfield display

RS 422 Protocol

Crusader Yoke System Diagram

Yoke/Vehicle Inputs



Vehicle VCP

Vehicle Battery Pack(Left Side)

28vdc power

current draw

Vehicle Battery Pack(Right Side)

28vdc power

28vdc

linear displacementmomentary

switch command

Crusader Simplified Parking Brake System Diagram

Command and Power Inputs

•Redundant electronics with an auto-switchover feature.

•Simplex actuator.

healthstatus bit

*One channelshown for simplicity

2700 lbf stall load1.35 in/sec rate3.20 in stroke



Drive-By-Wire Technology Demonstration ProgramAdapted for the Bradley Fighting Vehicle

Vetronics TechnologyTestbed Heritage

Joint effort with TARDEC and GDLS



Vetronics Computer

(VME)

BrakeControl

Electronics

BrakeActuator

PositionFeedback

PositionCommand

Transmission F/BTransmission S/S

Controller

SteeringThrottle

Controller

SteeringActuator

ThrottleActuator

Trans F/BActuator

Trans S/SActuator

SteeringChannel

ThrottleChannel

F/BChannel

S/SChannel

Typical forentire system

Vetronics Technology Testbed

Simplified System Model



MPC is providing to GDLS the Steering Actuator. Under currentdevelopment, this dual, 18-HP-motor actuator is a dramatic step forwardin high-horsepower land vehicle actuation. Exposed to the elements inthe undercarriage of the vehicle, this unit experiences extremely highvibration and shock environments. Each motor is an 18 HP AC devicesupplied by 600 VAC power.

8x8 Advanced HybridElectric Drive



Drive-By-Wire Pros

uAbility to tailor the system’s characteristics at each point in thevehicle envelope

uIncreased capability due to fault monitoring and diagnosticsuUse of purely electromechanical systems allows for the elimination

of environmentally hazardous hydraulic fluidsuReconfiguration to allow mission continuation or safe recovery

following system failures or battle damageuReduced maintenance costs, resulting from the reduction in

mechanical complexity and introduction of built-in testinguReduced operational costs, through improved maintainability and a

higher dispatch reliability



uElectromagnetic Interference (EMI)uNuclear, biological, chemical (NBC) complianceuWire harnesses: additional weight, assembly, EMI screening

uPossible solution? The emergence of drive-by-light could solveEMI and wire harness weight penalties.

Drive-By-Wire Cons



DBW Weight Considerations

Weight reduction due to removal of the mechanical linkages isapproximately offset by the additional weight of the electronic boxes ofthe DBW system.

Replacing an entire hydraulic system with electromechanical is also anapproximate even trade.

uEliminate hydraulic fluid, lines, and pumpsuGain wire harnesses and control boxes

The benefit is gained from the increased capability with DBW systems.



uTransmission controlsuSteering (both on-transmission and under-carriage)uBraking (service and parking)uTransmission selectuThrottle

uOther Electromechanical OpportunitiesuTurret drives (elevation, traverse)uAutomatic propellant handling systemsuFans and pumps

uGround Vehicle PlatformsuArmy XXI and Army After Next combat vehiclesuUnmanned ground vehiclesuSpecialized farm equipmentuAutomotive

Present and Future

Ground Vehicle Applications




uDrive-By-Wire technology is a step forward invehicle control methodology

uSimilar electromechanical actuation schemes canbe implemented across several platforms

This is only the beginning.Drive-By-Wire’s potential has yet to be fully realized!

2001 Vehicle Technologies Symposium - Intelligent Systems for the Objective · PDF...

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