Electrically Powered Hydraulic Steering
EPHS is a TRW electrically assisted steering solution, which combines advantages of electronically controlled on-demand steering with robust hydraulic actuation. TRW's EPHS is a compact Motor Pump Unit (MPU) connected with a conventional rack and pinion power gear.
As with other electric steering solutions, EPHS is independent of the combustion engine. The system requires comparably low application development costs - an ideal solution for hybrid electric vehicle platforms.
Compared with traditional hydraulic power steering, EPHS systems offer a fuel saving of up to 0.3L/100km and a reduction of carbon dioxide emissions of approximately 7g/km.
TRW offers different feature and power levels of EPHS, which cover A/B segment applications (GenB) up to applications with a maximum rack force of 18kN (GenC) - extending the benefits of electric steering to larger vehicles, including SUVs and delivery vans. In terms of software tuneability, EPHS delivers a number of benefits to steering feel, such as speed proportional functionality and general customizable steering properties.