A Comparative Study of Volvo XC60's MHEV and PHEV Powertrain Technologies
June 05 2023,
As we steer further into the era of sustainable mobility, automakers worldwide continue to invest in eco-friendly technologies. The Volvo XC60, a luxury crossover SUV, illustrates this evolution with its Mild Hybrid Electric Vehicle (MHEV) and Plug-In Hybrid Electric Vehicle (PHEV) offerings. These powertrain technologies provide remarkable differences in performance, operation, and energy consumption.
The MHEV system, also referred to as the B-Series engines (B4, B5, and B6) in Volvo parlance, uses a 48-volt starter generator. This system recovers energy during braking or deceleration, storing it in a small battery pack. This recovered energy is then utilized to power electronic components, offer a power boost during acceleration, or enable the start-stop system, significantly enhancing fuel efficiency. However, it is worth noting that MHEVs cannot function purely on electric power as the combustion engine is always in operation.
On the other hand, the PHEV version, known as the T8 in Volvo’s lineup, combines a gasoline engine with an electric motor, drawing power from a considerably larger battery pack that can be externally charged. As a result, PHEVs offer the unique ability to drive solely on electric power for a limited range. This range allows most daily commutes to be made entirely emission-free, provided the vehicle is regularly charged. PHEVs thus offer the best of both worlds: electric driving for shorter distances and the long-haul versatility of a gasoline engine.
A critical factor for potential buyers is fuel efficiency. While both technologies aim to reduce fuel consumption, the PHEV system offers a higher potential for efficiency, given the ability to operate solely on electricity.
Cost is another determining factor. MHEV technology is less expensive in terms of the vehicle’s initial cost, primarily because it lacks the substantial battery pack and associated electronics found in PHEVs. However, PHEV variants may offer long-term savings through lower fuel costs, particularly in regions where electricity is cheaper than gasoline.
Lastly, infrastructure plays a pivotal role. While MHEVs require no outside charging infrastructure, PHEVs will benefit greatly from access to home or public charging stations.
In summary, MHEVs and PHEVs provide different benefits: MHEVs offering a cost-effective solution to improve fuel economy, while PHEVs provide more significant fuel savings and the potential for all-electric driving. As such, the choice between the Volvo XC60’s MHEV and PHEV will largely depend on individual driving habits, charging accessibility, and economic factors.
