engine systems diesel engine analyst - parte 3
DESCRIPTION
Engine systems diesel engine analyst - parte 3TRANSCRIPT
Engine Works & Wears Engine Wear Combustion Process Internal Components External Components Cooling System Lubrication System Fuel System Air System Electronics
Electronic Control Module (ECM) Caterpillar’s Electronic Control Module (ECM)
and sensors control and monitor key engine function, including:
Fuel temperature. Engine oil temperature. Oil pressure. Atmospheric pressure. Coolant temperature. Injection actuation pressure Throttle position Injection timing & duration Logged faults
Features & Benefits of ElectronicsFeaturesElectronic Engine Control
Engine Speed GoverningTorque ShapingFuel-air Ratio ControlCold Mode StrategiesAltitude DeratingFuel Temperature Compensation
Information ManagementAccurate TrackingStored Results
Engine MonitoringFluid LevelFluid PressureFluid Temperature
BenefitsImproved EmissionsIncreased Performance & Reliability Improved DiagnosticsMeet customer needs for New Features / Advanced Technology
ADEM 4 Electronic Engine Control
19878-bit
PEEC II
1991Advanced
8-bitPEEC III
1993Two 8-bitADEM II
1998 32-bitADEM III
2004 32-bit
ADEM 4
Generations of Experience
Proven Reliability
Electronic Control Module
What if an ECM Fails? Troubleshooting guides help identify a component
or harness problem “Limp home” modes Ability to flash files at repair site
ECM Replacement Options? No serviceable piece parts Some Reman offerings exist
Electronic Control Module
What if a Sensor or Wiring Harness Fails? Decision to repair or replace depends on the problem Sensors and harness segments are serviceable Replacing an entire harness is a last resort
PEHJ0145
Agenda Engine Families Engine Works & Wears
Engine Wear Combustion Process Internal Components External Components Cooling System Lube System Fuel System Air System Electronics
Parts Differentiation REMAN Resources
Total System Design "Same as Caterpillar" Motives Parts Availability Design Modifications Quality Reusability Repair Solutions
New, Reman, Classic, Kits
Engine Parts Quality
Cut corners to lower costs Don't meet Cat specs
Competition Rigid tolerances Design updates
Caterpillar
Cylinder Heads
Cylinder Heads
Oversized, unthreaded,missing water holes
Competition
Properly machined
Caterpillar
Blocked passages
Competition Rigid cleaning process
Caterpillar
Cylinder Heads
Cylinder HeadsFeatures Properly machined parts Rigid Cleaning Process Rigid Tolerances Design Updates Right design for the system
Advantages Optimal cooling Less likelihood of leaks developing and so less chance of
problems related to leaking and/or overheating More durable• Longer life• More reliable operation• Less downtime so ultimately lower cost
Turning marks
Competition
Precisely ground
Caterpillar
Valves
Inadequate facingmaterial
Competition More facing material
than industry standard
Caterpillar
Exhaust Valves
Features• Precisely ground• High strength material• More facing material than
industry standard
Advantages• Increased protection against valve lip cracking and stem
breakage• Increased strength that allows for reusability through 1 or 2
overhauls• Greater fatigue strength• Longer wear life• More durable• More reliable operation• Less downtime so ultimately lower cost
Estimate Repairs
DiscussionDiscussion
Valves, Solution – Advantage
Not roll burnished Flange thickness out of spec O-Ring grooves not chamfered Increased chance of cracking
Competition
Roll burnished Controlled flange head thickness Chamfered O-Ring seal grooves Heat treated
Caterpillar
Cylinder Liners
Random cross hatch pattern
Competition Uniform cross hatch pattern
Caterpillar
Cylinder Liners
Competition Not machined to hone off
“saw-tooth” peaks
Caterpillar Pre-honed to preserve life
and disperse oil better
Cylinder Liners
Cylinder LinersFeatures Uniform cross hatch pattern Roll burnished Controlled flange head thickness Chamfered O-Ring seal grooves Heat treated High-grade gray iron Perfect fit
Advantages Proper oil distribution Longer liner life Increased strength; reduced
susceptibility to cracking Leakage prevention Reusable at first overhaul Lower repair / maintenance
costs over time Higher productivity Less downtime
Cylinder Liners