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TRW Automotive Delivers Fuel Efficient Steering System Across a Range of New Mercedes-Benz Models

logoTRW Automotive Holdings Corp. recently anounced that it 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.

Peter Lake, executive vice president, Sales and Business Development for TRW Automotive said:

 ”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.”

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 1000 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,” continued Lake.

Dieter Fehlings, engineering director for TRW steering systems, concludes: “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.

“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 TRW, it is about maintaining the quality of the steering feel, offering a range of functions and delivering environmental benefits,” concluded Fehlings.

About TRW

With 2008 sales of $15.0 billion, TRW Automotive ranks among the world’s leading automotive suppliers. Headquartered in Livonia, Michigan, USA, the Company, through its subsidiaries, operates in 26 countries and employs approximately 60,000 people worldwide. TRW Automotive products include integrated vehicle control and driver assist systems, braking systems, steering systems, suspension systems, occupant safety systems (seat belts and airbags), electronics, engine components, fastening systems and aftermarket replacement parts and services. All references to “TRW Automotive”, “TRW” or the “Company” in this press release refer to TRW Automotive Holdings Corp. and its subsidiaries, unless otherwise indicated. TRW Automotive news is available on the internet at

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