Pressemitteilung BoxID: 374438 (tedrive Steering Systems GmbH)
  • tedrive Steering Systems GmbH
  • Henry-Ford II-Str. 15
  • 52351 Wülfrath
  • Ansprechpartner
  • Britta Lange-Stolle
  • +49 (0)176/63 30 05 24

Product Launch at the 2010 IAA Commercial Vehicles

tedrive Steering’s iHSA® Hydraulic Steering Assist opens up safety features to commercial vehicles

(PresseBox) (Hanover/Wuelfrath, ) tedrive Steering Systems GmbH is unveiling its intelligent Hydraulic Steering Assist (iHSA) at the 2010 IAA Commercial Vehicles exhibition. The CO2-optimized steering system comes with all the functions of electromechanical power steering (EPS), enabling the integration of comfort and safety features that were previously limited to EPS systems. With iHSA, tedrive Steering has developed hydraulic steering that can support modern driver assistance systems, extending their availability to the commercial vehicle segments. This innovation, which is based on tedrive Steering’s cutting-edge steel housing and was developed using advanced valve technology, is being showcased by the company at the international event in Hanover in hall 26, booth A19.

When developing iHSA, tedrive Steering integrated the principle of driver-independent torque overlay into the hydraulic steering drive. This enables the system to provide passenger car comfort and safety features such as accident avoidance and lane departure warning assistance also to drivers of LCVs and trucks. tedrive Steering’s OE customers also benefit, as EC regulation No. 661/2009 will require new M2, M3, N2 and N3 class vehicles to be equipped with lane departure warning systems as of November 2013.

Hydraulic steering delivers a high level of steering support regardless of axle load, because its steering pump is powered by the vehicle’s engine. However, far more power than necessary is typically available when the vehicle is in operation: most steering power is required when parking, which obviously accounts for only a very small fraction of the driving cycle. For the majority of the time, the vehicle is being driven in a straight line, when steering support requirements are at a minimum. This is why conventional hydraulic steering systems suffer from so much power loss.

Innovative iHSA technology solves this problem: The iHSA’s control algorithm uses a small electric actuator located directly on the steering gear tower to provide torque overlay. At the same time, it factors in the actual steering power requirements via demand-oriented volume flow control in the power steering pump. The actuator only calls for power when it is required, so it cannot generate any power loss. Just like EPS, iHSA enables the integration of safety and comfort features, also delivering the potential to reduce fuel consumption and CO2 emissions. Another iHSA advantage on top of these environmental and functional improvements is its optimized packaging. The modular system paves the way for cost-optimized platform solutions.

Improving fuel consumption, and thus CO2 emissions, with a hydraulic steering system is achieved primarily through the power steering pump; in combination with tedrive Steering’s iHSA technology the CO2 optimization can even be improved further. tedrive Steering utilizes an EV² pump, designed by ixetic GmbH, a partner company also based in Germany. The EV² pump has been optimized specifically for the iHSA steering system. iHSA uses an analogue-controlled valve to regulate the pump’s output flow rate according to the demands of the given driving situation. As an overall system, iHSA thus achieves greater CO2 reductions per kilometre than comparable electro-hydraulic power steering (EHPS) systems. For commercial vehicles, this adds up to huge unexploited potential for cutting CO2 emissions.

“The advantages the steel housing brings for higher axle loads means that iHSA is predestined for light commercial vehicles as well as trucks. Our innovation will have a positive long-term impact on the steering systems market,” says Peter Heimbrock, head of product development at tedrive Steering Systems GmbH. He also spoke about some of the benefits of intelligent hydraulic steering. “iHSA combines regulatory compliance with noticeable driving benefits. While fleet operators save fuel and reduce their average CO2 emissions, drivers will welcome the excellent steering feel. And other functionality such as lane departure warning assistance can also be added when a driver assistance system is integrated. iHSA therefore contributes to driver safety, particularly for those on long hauls.”

Note to editors:

Steel housing – winner of the Steel Innovation Prize
The Wuelfrath steering systems plant was awarded the German steel industry association’s Steel Innovation Prize in 2006 in the “Steel Products” category for its steel housing. Today, with unit production in this million, it is a proven technology for hydraulic steering gears. Produced exclusively worldwide by tedrive Steering, the steel housing delivers an outstanding steering feel and has a more flexible design, is more compact and of higher quality than conventional aluminium housings.

tedrive Steering Systems GmbH

tedrive Steering Systems GmbH is a specialised development partner and manufacturer of steering systems for the global automotive market. The product portfolio encompasses steering gears for hydraulic and electro-hydraulic steering systems, mechanical steering systems, housings for steering gears, tie rods, rack bars and valves. To find out more, go to