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Team CNH

Team CNH. Mission Statement:. Design a less expensive propulsion control system with equivalent or better performance than existing hardware for Hydrostatic Windrower Machine. . Forward. Customer Wants. Low Cost Very Reliable Easy to Use Easy Maintenance High Level of Accuracy

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Team CNH

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  1. Team CNH Mission Statement: Design a less expensive propulsion control system with equivalent or better performance than existing hardware for Hydrostatic Windrower Machine. Forward

  2. Customer Wants • Low Cost • Very Reliable • Easy to Use • Easy Maintenance • High Level of Accuracy • Comfortable to Use • Minimal Machine Redesign • Highly Repeatable • Continued Operation Ability • High Perception of Safety

  3. Constraints • System Must Be Safe • System Must Meet all ASAE Codes • Total System < $300.00

  4. Benchmarking Current CNH System

  5. Benchmarking John Deere Hesston

  6. Design Metrics • Time to Reach Neutral • Total Cost • Response Time • Serviceability Index • Component Effects • Energy Usage • Repeatability Rate • Number of Parts Changed

  7. Design Target Values • Stopping Time < 10 Seconds • Total Cost < $250.00 • Response Time < ¼ Second • Serviceability Index < 237 • 12 Volt System, Draw < 30 Amps • Mean Time Between Failures > 3,240 Hours • Number of Parts Replaced <4

  8. Design Breakdown

  9. Motion Actuation

  10. Motion Actuation Concept 1- Rotary Actuator

  11. Motion Actuation Concept 2- Linear Actuator

  12. Actuation Design Decision Chose to Use A Linear Actuator Because: • Least Expensive Solution • Smallest Amount of Machine Redesign • More Durability • Lowest Energy Requirements

  13. Safety Return

  14. Safety Return • Concept 1- Engine Shutoff Benefits: Least Expensive and Easiest to Implement Major Problems: Complete Loss of Operation After Failure Customer Perception of “Unsafe”

  15. Safety Return Concept 2- Collapsible Linkage Normal Operating Conditions Failure Mode

  16. Safety Return Concept 3-Hydrostatic Braking

  17. Safety Return Concept 4- Hydro-Mechanical Failsafe

  18. Safety Return Design Decision Chose the Hydro-Mechanical Failsafe Because: • Safe • Low Cost • Quick Time to Reach Neutral Position • Ability to Use Other Functions After Propulsion Shutoff

  19. Final Design Assembly

  20. How Does it Work?

  21. Reverse vs. Forward Engine Shutoff • Machine will not be cutting crop in reverse • Center of gravity is close to front of machine • Reverse speed much less than maximum forward speed • Machine will not be moving in reverse on roadways

  22. Future Controller Design

  23. Validation- Machine Tests How Will Machine React if Engine is Shutoff While Operating in Reverse?

  24. Validation- Machine Tests Engine RPM Cylinder Position Ground Speed

  25. Validation- FMEA • Failure Modes and Effects Analysis • Identifies Potential Failure Modes • Estimates Occurrence Rate • Assess Severity of Failure • Evaluates Potential To Detect Failure • Recommends a Design Action to Lower Risk if Needed

  26. Sample FMEA

  27. Validation- Cost Breakdown

  28. Validation-Stress Analysis

  29. Path Forward • Finalize Actuator Supplier • Build Prototype • Write Controller Code • Test Mean Time Between Failure in Lab • Perform Field Tests

  30. QUESTIONS ?

  31. Final Design Layout

  32. Spring Return Mechanism Existing CNH Return Spring

  33. Hydraulic Cylinder + Valve

  34. Linear Actuator

  35. Hydraulic / Spring Connection To Pintel Arm To Spring Assembly Hydraulic Connection

  36. Actuator Mounting Bracket

  37. Actuator-Cylinder Connection

  38. Ci PWM Controller Diagram rd ed ri ei yi t yd Cd DC Motor Screw Linear actuator rd: Reference Displacement ed: Error Displacement Cd: Displacement Controller Ri: Reference Current Ei:Current Error Ci/PMW: Current Controller Yi: Output Current Yd:Output Displacement

  39. Validation- Stress Analysis

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