Hybrid technology in brief

A Hybrid Electric Vehicle (HEV) uses at least two different sources of energy. Accordingly, it combines two different energy converters for propulsion. Volvo's approach is to use diesel fuel and the electric power from the energy storage system, mainly batteries.

Efficient power usage
The main benefit of hybrid power-train systems is their ability to optimize the usage of the two power sources to suit the current situation.

Typically, electrical power is used for fuel-consuming activities like acceleration and during deliveries. The diesel engine takes over as speed and power outtake stabilize. In this way fuel consumption, environmental impact and noise levels can be significantly reduced.

Parallel hybrids are preferred
There are three basic configurations in HEV powertrains: series, parallel and split power. The Volvo hybrid truck uses a parallel-hybrid drivetrain system, since it provides the best balance between cost and benefit. Most hybrid suppliers began working on series-hybrid systems and have transitioned to parallel-hybrid architecture for similar reasons.

Please read more about the Volvo parallel hybrid system I-SAM by following the links to the right.



I-SAM paralell hybrid system

Volvo uses a parallel-hybrid drivetrain system designated I-SAM (Integrated Starter, Alternator Motor). The system integrates a powerful electric motor within a driveline complete with diesel engine and automatic gearbox. The motor also serves as an alternator that provides the onboard battery system with power.

Smaller engine - same performance
Thanks to efficient interaction between the two power sources, a smaller diesel engine can be used without compromising on performance.






Recover braking energy
Braking energy is converted in electricity and stored in the batteries. The stored electricity can be used to operate the electric motor and electrical applications such as doors and air conditioning during standstills.

Volvo FM Hybrid Concept - technical data

  • Volvo FM with I-SAM
  • 6-phase PM synchronous motor
  • Power 120 kW
  • Torque 800 Nm
  • Volvo MD9 engine
  • I-Shift gearbox




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