Example 2: Gear Shift (1)

• Basic system:
  • manual transmission in a car
  • allows to change the ratio of rotational speeds from motor and drive shaft
  • usually provides a few fixed ratios (gears)
  • complex internal structure
    • 
• Model in Modelica:
  • basic component GearWithExternalRatio
    • two connectors (flanges) and external input ratio r
    • equations
    • 
  • gear shift model
    • 
    • table to compute ratio from gear
    • additional inertias
  • complete model
    • 
  • run in Dymola with changing gear →
    • Failed to reduce the DAE index.