Case-New Holland. Steer-by-Wire Detailed Design. Today’s Agenda. Who is CNH? Background Project Goal System Level Concept Design Components Detailed Concept Validation of Concept Superiority Resources and Cost Summary of Results What’s Next?. Who is CNH?.
Steer-by-Wire Detailed Design
Current Steering System
The system is currently a purely mechanical linkage from operators hand to hydrostatic pumps.
Goal is to remove mechanical linkage and replace with a lower cost, expandable, steer-by-wire system
2 Independent Output Channels
Sensor: Reads Angular Displacement
1.) Production Price: < $90.00
2.) Accuracy: ± 1°
3.) Resolution: ± 0.5°
4.) Temperature Range: -40° - 180° F
BEI Duncan NCAPS
Detailed Design of Shaft
Detailed Design of Mounting Bracket
First graph shows the output of the sensor and encoder vs. time.
Second graph shows the difference between the two outputs
Third graph shows the derivative of the BEI sensor output.
BEI Sensor for prototyping
Fabricated bracket for mounting of sensor
Testing of prototype for temperature requirements, reliability, drift, and EMC
Senior Design Team
Building of Prototype Steering Column
Testing of resolution, repeatability, and accuracy were done using UofD PC running Lab ViewResources
Total Estimated Cost