TRW Automotive Holdings Corp. will supply Daimler AG with a newly enhanced Motor Pump Unit as part of the Electrically Powered Hydraulic Steering system (EPHS) on selected new Mercedes-Benz models.

The MPU delivers enhanced performance and environmental attributes when compared with conventional hydraulic solutions, the company reports.

"TRW supplies its EPHS technology to a number of Mercedes-Benz models including these recent launches. We're satisfied to be in a position to support Mercedes with its focus on delivering improved fuel efficiency," says Peter Lake, executive vice president, Sales and Business Development for TRW Automotive.

With TRW's motor pump unit, hydraulic assist is determined by the pump speed and controlled by a patented, brushless motor which provides assist only when it is needed. The system used on the various Mercedes models uses TRW's newest high power motor pump assembly providing a hydraulic output power of up to 1,000 watts. Compared with traditional hydraulic power steering, the system also offers fuel savings of up to 0.29L/100km and a reduction of carbon dioxide emissions of approximately 6g/km.

TRW's motor pump unit provides flexible tuning capability allowing the system to adapt to different driving conditions, providing a comfortable setting for parking and city driving, while delivering a safe and robust feel at higher speeds. There is also the option for EPHS to vary assist levels depending on the vehicle loading information provided by other vehicle subsystems.

"TRW's EPHS technology is a proven, off-the-shelf solution which can be used for most HEV steering load requirements. With flexible packaging and mounting options, the technology offers much of the functionality, fuel efficiency and emissions reductions of a full electric system. EPHS is ideal for HEVs as a technology that can be used across both the conventional and hybrid powertrain platforms, reducing application engineering costs," adds Lake.

"TRW is well positioned to support vehicle manufacturers in their quest for improved fuel efficiency. We have a proven technology that can be adapted easily for conventional and hybrid applications. This makes it easy for our customers to fit a system that further improves fuel economy, beyond the benefit of the powertrain itself," says Dieter Fehlings, engineering director for TRW steering systems. "The technology can also be applied to existing Hydraulic Power Steering systems in order to meet short term CO2 requirements. In this case, the mechanical pump is substituted by TRW's EPHS motor pump unit technology."

For more information, visit www.trw.com.