For an industry that has tried
everything from 300-600 volts with pure electric vehicles, plug-in hybrids and
big lithium-ion batteries, a widespread 48-Volt strategy may offer the biggest
bang for the buck. Europe is calling for CO2 emissions reductions of more than
25 pc by 2021 and regulations in China and the U.S. will require tighter CO2
mandates over the next decade.
Compared to higher voltage
mild hybrids, vehicles with 48-Volt systems have demonstrated 70 pc of the benefit at 30 percent of the cost.
Delphi’s goal is to exceed the benefit by maximizing the use of the 48-Volt
architecture to deliver enhanced overall performance.
These 48-Volt mild hybrids, for gasoline or
diesel engines, could reduce the percentage of CO2 emissions by double digits, capture
energy typically lost while braking and provide torque in the low rpm range for
anemic start-stop hybrids. The beauty of a 48-Volt solution is that drivers
will not lose engine performance to gain fuel efficiency from downsized
engines. Consumers would drive these
48-Volt cars the same way they would drive cars powered by conventional
powertrains, and they would enjoy the 20 pc extra horsepower the 48-Volt system
By 2025, 48-Volt hybrids are
expected to make up more than 95 percent of the world’s mild hybrid market and
about half of all hybrid vehicles, according to Global Insight IHS.
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