Cummins launches advanced engine and turbo technologies at IAA 01 October 2014

Cummins has unveiled its latest G Series heavy-duty ISG12 engine at IAA Hannover (25 September to 2 October), along with a lighter weight Holset HE300VG variable geometry turbo and its first Holset M² two-stage system with rotary turbine control (RTC), developed with Nissan for its next generation Titan pickup truck.

The new in-line six-cylinder engine – available with 11- and 12-litre displacements and already installed in the new Foton Daimler Auman GTL truck – is aimed at trucks, buses, coaches and specialist vehicles. The Euro version is due out shortly.

Remarkable features include its compactness and significant weight reduction, according to Brett Merritt, Cummins executive director for its on-highway business. He explains that that's due to its sculptured block, which retains rigidity while reducing mass.

Additionally, the new engine uses composite material for the oil pan and valve cover, contributing to a weight of 860kg and a high power capability of more than 500bhp and 2,300Nm peak torque.

"This delivers a high power-to-weight ratio, 30% higher than the average for engines with a similar power range," states Merritt – adding that it also includes Cummins XPI (Xtra-High Pressure Injection) fuel system and advanced wastegate turbocharging technologies.

As for the Holset HE300VG, Cummins is claiming improved efficiencies of up to 12%, enabling improved fuel efficiency and CO2 emissions performance, as well as a 10% weight reduction.

IT also says that integration with engine systems is improved, thanks to a new actuator, while durability and performance are up due to a patented moving shroud VG mechanism.

The electric wastegate offers two actuator options (for light and heavy duty applications), and its twin port technology also delivers faster response and more precise control – meaning opportunities for engine designers in terms of fuel and aftertreatment efficiencies.

Meanwhile, the two-stage (in series) Holset M² packaged turbo for Nissan is being shown fitted to a Cummins 5.0L V8 turbo diesel engine.

Cummins' RTC technology, which used to channel exhaust to the optimise exhaust control performance, has four main operating modes: high-pressure, two-stage turbo to minimise turbo lag and optimise transient performance; low-pressure, single-stage turbo mode for power performance and smooth mode transition; wastegate mode to maximises engine power; and regen mode for optimum after-treatment control.

"Advances in air handling technology and improved integration continue to provide new solutions that enable customers to achieve [emissions and efficiency improvements] without compromising engine performance," comments Jonathan Wood, executive director for research and engineering at Cummins.

"As part of that technology development journey, we are unveiling this new addition to our suite of next generation, post Euro 6 technologies."

"Nissan will be the first to benefit from this pioneering integrated technology, which delivers high efficiency, excellent driveability and the low emissions levels required in North America and Europe."

Brian Tinham

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