How MHEVs work
In a mild hybrid electric vehicle, the primary power source remains the internal combustion engine (gasoline or diesel), which is supplemented by an electric starter-alternator connected via a timing belt. The system uses a battery with a maximum voltage of 48 volts to provide two main functions: managing an efficient Start & Stop system and providing additional power during acceleration phases.
The technology captures energy during braking and deceleration, which would otherwise be wasted, and stores it in the battery. This recovered energy is then immediately reused to assist the combustion engine, reducing overall fuel consumption. This regenerative braking system is particularly effective in urban driving conditions with frequent stop-and-go traffic.
Key characteristics
The hybridization system in MHEVs is significantly less sophisticated than full hybrid (HEV) or plug-in hybrid (PHEV) systems. This simplicity is both an advantage and a limitation. On the positive side, the system requires minimal changes to the vehicle’s architecture, making it relatively simple and inexpensive to install compared to more advanced hybrid systems.
However, the fuel savings achieved by mild hybrid vehicles are more modest. The vehicles cannot operate in pure electric mode, meaning they don’t qualify as truly clean vehicles and are typically not eligible for eco rebates or similar environmental incentives.
Applications in logistics
For logistics operations, MHEVs represent an entry-level step toward reducing carbon emissions while maintaining the reliability and range of traditional combustion engines. They are particularly suitable for urban delivery routes where the Start & Stop system and regenerative braking provide the greatest fuel savings benefits.
The technology helps fleet operators meet increasingly stringent European emission standards without requiring significant infrastructure changes or the higher investment costs associated with full hybrid or electric vehicles. While the environmental benefits are limited compared to more advanced alternatives, MHEVs offer a practical transitional solution for companies beginning their journey toward greener fleet operations.
