Isuzu Claims Oversize Diesel Turbos Could Cut Emissions

Super-sized turbo chargers for diesel engines are claiming a 10% improvement in fuel efficiency and CO2 emissions.

Auto specialist SuperTurbo Technologies, say the concept of marrying both turbo and super charged induction methods into a hybrid system has been proved to work on an Isuzu 7.8-liter steady state diesel. It plans to present a white paper on its tests conducted with cooperation from Isuzu at the SAE World Congress.

The Japanese car and truck manufacturer has been helping with the project over several years and results claim improvements over traditional variable geometry turbochargers and two-stage turbochargers. The oversize unit dubbed, the SuperTurbo, is a fully mechanical driven charger that claims to harness the advantages of both turbo and super chargers.

It includes a high-speed traction drive that transfers bi-directional torque between the turbine shaft and a continuously variable transmission which then allows for overall ratio control between the turbo and the crankshaft.  With the turbine shaft speed controlled, turbo lag could be eliminated allowing for heavier higher efficient turbine designs. By using mechanical drive on turbochargers automaker can precisely control and balance boost pressure and air fuel ratio to suit the specific needs of their products.

On top of fuel and CO2 efficiencies, the SuperTurbo uses a programmable turbine bypass to rapidly direct the engine exhaust to the after treatment to cut harmful NOx emissions during cold starts.

— Paul Myles is a seasoned automotive journalist based in London. Follow him on Twitter @Paulmyles_

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