​​​​​​​​​​​​​​EHPS

Conventional hydraulic power steering (HPS) is driven directly by the internal combustion engine via belts or gear trains with a fixed gear ratio which yields a pump speed that is directly proportional to the engine speed. In order to provide sufficient power for the steering in every situation, the pump must be able to deliver the full volumetric flow rate even when the engine speed is low, which means that for most operating situations, it is over-dimensioned. For this reason, higher engine speeds require a restriction of the volumetric flow rate by means of a bypass, which, however, entails unnecessary losses and system inefficiency. 

Consequently, ECS has developed a highly integrated and powerful Electro-Hydraulic Power Steering Pump (EHPS) for 24V Boardnet Architectures which allows this problem to be circumvented specifically for commercial Trucks and Buses. This technology retains the conventional steering gear box whilst having the advantage of fully flexible packaging due to its directly driven electric motor with integrated power-control electronics. In combination with a Cooling realized via the Hydraulic Oil, further measures can be considered when it comes to vehicle packaging and integration. 

With the possibility of an intelligent Operation Strategy and Steering Map individually configurable for different Vehicle Types and Operating Profiles, the demand-based control of the pressure and volumetric flow rate in relation to Vehicle Speed and Steering Angle can be set contributing further towards increased Steering Comfort and Efficiency.