Parallel Hybrid: Diesel + Dual Electric Motor with Energy Storage

This parallel hybrid system uses dual electric motors. Power regeneration is possible when a clutch is installed between the diesel engine and the RePTO drive.


High Voltage

Data / Command Signals

System Overview

  • Parallel hybrid using diesel and electric power
  • Electric power boosts diesel power in high demand periods or is used independently during low-demand periods (e.g. creep mode)
  • During low-power operation, the e-motor can use excess diesel power to generate electricity
  • Power regeneration through braking (inertia or vehicle) or lowering loads is possible but requires a clutch between diesel engine and RePTO drive

RePTO drive

  • Installed between diesel engine and e-motor/generator
  • Single and dual tower options available for driving motor generator, hydraulics or other auxiliary loads
  • Clutch between diesel and RePTO drive for electric-only mode and for power regeneration
  • Permits power generation through PTO/PTI in various operating states
  • Prevents engine back-driving during electric-only operation

Hybrid Controller

  • Manages power distribution, interfacing with customer’s vehicle/machine controller and high voltage equipment


  • Selection based on application characteristics (torque, installation)

Inverter, High Voltage Equipment

  • Controlled and monitored by hybrid controller

Energy Storage & BMS

  • Selection based on application characteristics

Diesel Engine

  • Not supplied by Twin Disc

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Twin Disc specialists are available to work with your technical experts to select the optimal configuration and components for your specific application.

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