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

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

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

Benchmarking Current CNH System

Benchmarking John DeereHesston

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

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

Design Breakdown

Motion Actuation

Concept 1- Rotary Actuator

Motion Actuation Concept 2- Linear Actuator

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

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”

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

Safety Return Concept 3-Hydrostatic Braking

Safety Return Concept 4- Hydro-Mechanical Failsafe

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

Final Design Assembly

How Does it Work?

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

Future Controller Design

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

Validation- Machine Tests Engine RPMCylinder Position Ground Speed

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

Sample FMEA

Validation- Cost Breakdown

Validation-Stress Analysis

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

QUESTIONS ?

Final Design Layout

Spring Return Mechanism Existing CNH Return Spring

Hydraulic Cylinder + Valve

Linear Actuator

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

Actuator Mounting Bracket

Actuator-Cylinder Connection

Controller Diagram DC Motor C i PWM Screw Linear actuator CdCd rdrd eded riri eiei ydyd yiyi  r d : Reference Displacement e d : Error Displacement C d : Displacement Controller R i : Reference Current E i :Current Error C i /PMW: Current Controller Y i : Output Current Y d :Output Displacement

Validation- Stress Analysis