Powertrain Differentials

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Powertrain Differentials

• David Ng

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Objectives

• Familiarize with the essential elements of
  Powertrain
• Provide an oversight of torque and speed transfer
  to differentials

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http//www.simcreator.com/product_sheets/powertrai
n_ps.pdf
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Powertrain Components

• Engine
• Torque Converter
• Gear Box
• Transfer Case (depending on drive type)
• Rear/Front Differentials

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Engine

• Creates torque
• Torque is defined by torque map
• Summed with additional torque from any
  accessories and downstream components

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Torque Converter

• Based on the input speed ratio
• Downstream Angular Velocity Upstream Angular
  Velocity
• Smoothes torque transfer from Upstream and
  Downstream
• Predicts transient behavior

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Gear Box

• Manual Transmission is user-defined
• Automatic Transmission
• Current Speed is estimated
• Accelerator pedal angle and calculates speed for
  gear-shift
• If current speed is greater then speed for
  gear-shift then gear is changed.

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Transfer Case

• Applies upstream torque to the wheels
• AWD divides torque equally among the front and
  rear wheels
• Transfers torque to wheels via Driveshaft
• Upstream Angular velocity is propagated down to
  torque components

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Conclusion

• Introduction to Powertrain Components
• Function of the Powertrain
• Transfer of Torque and Speed through components

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References

1. Realtime Technologies http//www.simcreator.com/p
   roduct_sheets/powertrain_ps.pdf
2. Engineering Fundamentals
3. http//www.efunda.com/DesignStandards/gears/gears_
   auto_diff.cfm
4. Wikipedia http//en.wikipedia.org/wiki/Differenti
   al_gear