Electronic Power Steering Systems

KSR offers customized power modules and systems for Electric Power Steering (EPS) and Electric-Hydraulic Power Steering (EHPS) systems. EPS and EHPS continue to replace the existing hydraulic power steering systems to improve fuel economy, reduce system size and weight while improving reliability. EPS/EHPS is also emerging as an enabler of four-wheel steering, a premium vehicle feature that dramatically reduces the vehicle turning radius. The power electronics modules and systems that control the EPS/EHPS motor are crucial to the implementation of EPS/EHPS and require a combination of specialized skill sets.

We design, test and manufacture both the power and the control electronics of EPS and EHPS systems. With a system level approach, KSR has advanced its power electronics, thermo-mechanical design, motor control and qualification process expertise to deliver highly reliable and compact systems for EPS/EHPS. The systems we design specifically serve the critical EPS/EHPS function in rugged environmental conditions. Our compact product configurations allow the EPS/EHPS to be mounted onto the column, rack or pinion.

Reliability and compactness are achieved by combining a highly rugged and efficient power semiconductors and the electrical design with high performance packaging and optimized control strategies. Building on our extensive in-house power semiconductor capabilities, KSR is positioned to make the best reliability/size/cost trade-offs. We have the capabilities to design custom dies with a quick turn-around to fit the exact customer requirements.

At KSR, we leverage advanced packaging technologies to make control units small, low cost, and reliable. Rugged thermal design permits high temperature operation for under the hood applications and minimizes power cycling stress for high reliability. Our customized systems are designed to fit the mechanical outline of the motor design for easy assembly and reduced interconnectivity.

We have developed advanced modeling of EPS and EHPS systems and offer proprietary control algorithms, based on an advanced knowledge in phase advance algorithms and of both sensored and sensorless controls. We can support several motor types including permanent magnet, DC, and switched reluctance. The precise integration of the control and power sections of the system ensures optimum efficiency and a reduction of electromagnetic interference (EMI). Our solutions support various communication mediums including CAN, KLine, LIN along with newer types such as FlexRay.


KSR is an industry leader in the design, engineering and manufacture of an array of products for the transportation industry (autos, light trucks, ATVs), including automotive sensors, electronic throttle controls, adjustable and fixed pedals, electric steering control units and power modules.

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