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04/10/2011
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Developed for a new generation of micro mild hybrid vehicles, Controlled Power Technologies' innovative application of switched reluctance motor technology for existing 12 and 24v systems means it is well placed to exploit the proposed 48v electrical architecture fast gaining ground in Europe.
 Other applications of a more powerful air charging solution for reducing CO2 emissions without sacrificing vehicle performance include commercial vehicles for reducing diesel engine NOx and particulate emissions.
The low carbon vehicle specialist Controlled Power Technologies (CPT) is developing a 48v version of its electric supercharger based on its variable torque enhancement system known as VTES. The more powerful higher voltage variant will support moves by European vehicle manufacturers announced earlier this year to introduce 48v passenger vehicle power networks to help meet the requirement for lower fuel consumption and CO2 emissions.
CPT currently provides the only production ready 12v supercharger available as original equipment for passenger car applications. The scalable design and highly controllable switched reluctance motor technology means it can move swiftly to offer a more powerful 48v solution to meet a diverse range of OEM customer enquiries.
At 48v a VTES electric supercharger will efficiently transform 7kW of battery power into a highly boosted charge of air for downsized gasoline and diesel engines. Unlike crankshaft driven superchargers and exhaust gas driven turbochargers, an electric supercharger is mechanically decoupled from the engine, which means it can deliver the air almost instantaneously into the engine – spinning up to 70,000rpm in less than a third of a second.
"Even with the higher transmission gearing adopted by manufacturers to reduce CO2 emissions and particularly at the lowest engine revs, the instant additional torque when the driver needs to accelerate these smaller powertrains from low engine speeds is already very beneficial at 12v," says CPT's engineering director and chief technical officer Guy Morris. "Electric supercharging at 48 volts extends that envelope of torque enhancement. It's an efficient way of using 7kW of stored electrical power to deliver not less than six times that at the crankshaft. In other words adding a useful 42kW boost for low speed overtaking and hill climbs. Depending on the turbocharged engine system optimisation the boost could be as much as much as 70kW or 10 times the instantaneous power extracted from the batteries or supercapacitors."
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Author
John Challen
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