aspects of heavy-duty truck predictive maintenance · practical predictive maintenance the internet...
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Bill Wade
Wade&Partners
Aspects of Heavy-Duty Truck
PREDICTIVE
Maintenance
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Practical Predictive Maintenance
The Internet Tells All … Google Counts:
Unmodified Search 231,000
Medical 54,000
Automotive 9,500
Aviation 8,000
Diesel 5,800
HD Truck 1,200
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Potential Problems with PPM in the Fleet Environment:
•Equipment Typically Mobile, Multi-Domiciled
•Definition of Failure for Cost Calculations
•Failure is Often Product of Least Component
•Diagnostics Show Condition, Not Cause:
–Vibration
–Fluid Status
–Temperature
–Flow/Pressure/Rate
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Good Existing Possibilities
PRESSURE SWITCH STATUS • ABS CONTROL STATUS
PARKING BRAKE STATUS• TRAILER TETHERED STATUS
WHEEL SPEED SENSOR STATUS• TRAILER WEIGHT
BRAKE APPLICATION PRESSURE• BRAKE SUPPLY PRESSURE
BRAKE LIGHT STATUS • BRAKE CONTROL PRESSURE
BATTERY POTENTIAL• AUTOMATIC RAISING OF LANDING GEAR
AXLE LIFT AIR PRESSURE• CARGO AMBIENT TEMPERATURE
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Cost of Random Failure
TIME
FAILURE
INCIDENCE
INFANT
FAILURES
RANDOM
FAILURES
WEAR
FAILURES
COST OF
FAILURES
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Curves of Curves
VEHICLE
COMPONENT 1COMPONENT 2
COMPONENT 3
COMPONENT 4
COMPONENT 6
COMPONENT 5
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Weibull Probability Density Function
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Weibull Probability Density Function
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Obvious Potential Problem Areas:
•Data Overload
•Communication Protocol
–J1708 (SAE)
–J1939 (SAE)
•Common Nomenclature
•Diagnostics of Root Cause
•Cost/Benefit Equation
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TelematicDevice
EnhancedEasy-StopTM ABS
MeritorTire Inflation
System
Disc Brakes
ElectronicLevellingModule
IntegratedVehicle
Tire Monitoring
ABS w / RollStability Control
AdaptiveCruise Control
Truck PC
RefrigerationUnit
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ALTERNATOR
Insta-CheckTM
Predictive Diagnostic Module
Keyboard
Display
Defective Alternator, critical,
turn off all unnecessary loads
and immediately get to a repair
facility.
Defective Alternator, critical,
turn off all unnecessary loads
and immediately get to a repair
facility.
Defective Alternator, not
critical, report to operations.
Turn on electrical loads.
Lights, blower motors,etc.
Report to operations.
Qualcomm
Over ChargePartial ChargeNo charge
voltage falls below 12.5 and
> 600 RPM
voltage over 12.5
and > 600 RPM
Keyboard
DisplayQualcomm
Keyboard
DisplayQualcomm
Keyboard
DisplayQualcomm
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Low Voltage Disconnect Functions
11.5 volts in less than 60 minutes
from original 12.3 volts activation
11.5 volts in more than 60 minutes from
original 12.3 volts activation
If loads are turned off, wait 5 min.
before starting.
Truck will not likely start. Considerable time
to recharge will be required before starting.
Keyboard
Display
Checks Voltage Every 60
Seconds
Starts Clock at 12.3 volts
Battery voltage drops to
12.3 volts, the LVD activates.
If Voltage Falls to 12.1
0 to 30 Minutes to
12.1 v
31 to 90 Minutes to
12.1 v
91 to 180 Minutes
to 12.1 v
Qualcomm
Critical, either high loads staying on or marginal
batteries. Must be restarted A.S.A.P.
Very small load remaining on. Need to restart
in near future.
Small load remaining on. Need to restart within
one hour.
Keyboard
DisplayQualcomm
Keyboard
DisplayQualcomm
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Data Overload
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Where is the Practical Limit?
•Approaches
–Reactive
–Periodic
–Inspection
–Predictive
•Tool Kits
–EDI
–SAIM
–InfoLinkTM
System
–Statistics Based Maintenance
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Optimum Schedule for Preventive Maintenance
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Information Trumps Iron, Again
•Clean, understandable, significant data is the first critical step.
•Information has time & place utility.
Data
Information
Knowledge
Wisdom
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Key Fleet PPM Technologies:
•On-Vehicle Communication
•Multiplex Supply Hose (not chain)
•Diagnostic Force Multipliers
–CU / Cme Mobile Video
–Expert (decision tree) Systems
–PC and PDA Based Software to analyze J1939 data
•Functional Consumer Conditioning (process)
•R & R Training
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PPM Human Resource Hurdles
•Bi Modal Experience Distribution
•Competition for Technical Talent
•Cost Consequences of Supply / Demand
•Non-Traditional Talent Pool
•Culturally Appropriate Training
•Information Synchronization
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Aspects of Heavy-Duty Truck
PREDICTIVE
Maintenance