Volvo Reveals 450-HP Four-Cylinder With Electrically-Driven Turbo: Video
Audi recently unveiled a high-performance diesel engine
that featured a pair of turbochargers and an electric motor that spools
the smaller of the turbos at low revs to help it produce almost
instantaneous boost. The technology is expected to debut in 2016 in a high-performance version of Audi’s next-generation Q7 SUV and slowly filter across to more models.
Now Volvo has revealed a similar concept, based on a gasoline engine.
With its decision to adopt engines with no more than four cylinders,
Volvo has been forced to add complex hybrid systems to boost power levels
to match outputs of rival manufacturers’ V-8 models. But its new
electrically-driven turbocharger technology looks to be a simpler—and
likely more affordable—alternative.
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Using a 2.0-liter Drive-E four-cylinder engine as the starting point,
Volvo engineers added a twin-turbocharging system to boost output. But
unlike a conventional turbocharger setup that uses wasted exhaust gases
to spin its compressor wheel, the turbochargers on Volvo’s new engine
spin their compressors using high-pressure air fed from a third,
electrically-driven turbo, in essence making this a triple-turbocharged
Though not mentioned, the electrically-driven turbo is likely utilized
at low revs only. Once revs are sufficiently high, the two turbochargers
feeding air to the engine likely rely on wasted exhaust gases to keep
their compressors spinning, like a conventional turbocharged engine.
But to further boost output, Volvo’s new engine also uses a
high-pressure fuel system that pumps fuel into the engine at more than
3,600 psi. Combine this with the charged air from the turbochargers, and
you’re looking at a 2.0-liter four-cylinder engine capable of
delivering 450 horsepower—without any turbo lag!
At present, the engine is still in the concept phase but Volvo is
working closely with suppliers as well as its performance arm Polestar
to further develop the technology.
“When we launched the Drive-E powertrain family, our aim was to deliver
the most advanced four-cylinder engines in the industry based on
emissions and fuel consumption relative to performance and drivability,”
Volvo R&D chief Peter Mertens said. “The 450-hp high-performance
Drive-E powertrain concept demonstrates this ambition and the
versatility of the Drive-E powertrains.
Courtesy - youtube, volvo cars, motorauthority.com