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New SAE book on 48V technologies for mild hybridization

SAE International announced a new book, 48-Volt Developments, available now on the SAE International website. Development of higher-voltage electrical systems in vehicles has been slowly progressing over the past few decades. However, tightening vehicle efficiency and emissions regulations and increasing demand for onboard electrical power means that higher voltages, in the form of supplemental 48 V subsystems, may soon be nearing production as the most cost-effective way to meet regulations.

The displacement of high-wattage loads to more efficient 48 V networks is expected to be the next step in the development of a new generation of mild hybrid vehicles.

In addition to improved fuel economy and reduced emissions, 48 V systems could potentially save costs on new electrical features and help better address the emerging needs of future drivers.

Challenges to 48 V system implementation remain, leading to discussions by experts from leading car makers and suppliers on the need for an international 48 V standard. Initial steps toward a proposed standard have already been taken. The consensus of global forecasts suggests that 48 V mild hybrids will soon come to dominate the market.

Compared with 200-600 V full hybrid and battery electric vehicles, the lower-voltage approach avoids the need for high-cost safety features and large battery packs. 48-Volt Developments includes eight technical papers.



I think mild hybrids are a great idea - if you can get a stop-start - roll functionality into lots of cars, you can clear urban air.
You need to be able to propel a car up to about 30-35mph, i.e. enough for urban traffic - by electricity. faster than that you can use petrol or diesel.

If you could get this into lots of cars within 5 years, you could improve urban air quality a great deal, almost as much as going full hybrid or pure EV, but at lower cost / vehicle.

David Freeman

As GM found out with e-Assist, trying to improve performance by moving to a mid-level performance platform (e.g., 120V) doesn't provide enough performance or efficiency boost to attract consumers.

Using a low-cost 48V platform could drive the low end of the market, enabling start/stop and some torque assist. Much like e-assist, I doubt that such a small system would actually be able to move the car without the engine running (except for very slow speeds).

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