The future of mild-hybrid technology to be shown at Automechanika as Delphi reveals its ground-breaking 48-volt system



New Delphi technology provides 50 to 70 percent of the benefit of a high-voltage full hybrid for just 30 percent of the cost


A new 48-volt mild-hybrid technology developed by Delphi will provide 50 to 70 percent of the benefit of a conventional high-voltage, full hybrid for just 30 percent of the cost. This one system can capture 85 percent of the braking energy available on the recently introduced WLTP emissions test cycle. That energy can then be returned to the powertrain, substantially improving emissions and fuel economy as well as enabling further engine downsizing.

While an OE technology, Delphi engineers have thoroughly considered how to improve every aspect of this innovative system, including opportunities for serviceability during maintenance and repair. One of the reasons for specifying 48 volts is to protect technicians who may accidentally touch live components. Working below this safety threshold means that the system can be less complex (costly and heavy) than a high-voltage system, ensuring garage technicians will require less specialist training and can work on the system with standard tools.

“Converting otherwise wasted energy into usable power allows us to reduce the engine’s workload. Doing this creates a good foundation to help meet the forthcoming CO2 emissions regulations and create a more environmentally friendly vehicle,” explains Chad Smith, vice president, Delphi Product & Service Solutions EMEA. “This is a great example of how Delphi’s expertise in OE and service are being combined to provide ground-breaking new green technology for vehicle manufacturers while ensuring that garages can still work safely and efficiently.”

As well as capturing energy that would otherwise be wasted and returning it to the powertrain, the system allows other vehicle systems (such as air conditioning) to be powered more efficiently and with greater control compared with engine-driven systems.  The prototype takes a further step by using an electrically-driven turbocharger, enabled by the 48-volt system, to provide near instant boost as soon as it is needed.

 It also allows further engine downsizing by providing instant torque for pull-away while the turbocharger is spinning up to speed.

As forthcoming European regulations call for a reduction in CO2 emissions of more than 25 percent before 2021, Delphi believes its 48-volt, mild-hybrid technology can help reduce the percentage of CO2 emissions by double digits.

More images available here. 


Anthony Hornsby (UK)

+44 1295 277 050            

Marie-Pierre Ygrié (Europe, Middle-East and Africa)

+33 (0)1 70 76 72 64


Automechanika Press Kit