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.