Give steering a power boost when its needed

Electric power assisted steering (EPS / EPAS) consumes less fuel than conventional hydraulic power steering systems. Using an electric motor results in significant weight and space savings compared with hydraulic belt driven pump systems that need to provide a constant hydraulic pressure. EPS systems also provide the required level of power assistance when needed, based on vehicle speed and how quickly the steering wheel is turned.

With accurate steering column torque information, the right power assistance can be given precisely and smoothly through efficient electrical commutation of the servomotor. Aiming at contactless and wear-free operation, our portfolio of magneto-resistive sensors delivers the accuracy needed to measure torque, rotor position as well as steering column angle for EPS / ABS functions.

With a family of FlexRay transceivers NXP ensures robust and instant communications between EPS and ABS systems allowing the level of power assistance to be optimized for speed. And while small and medium cars generate sufficient power to drive EPS systems, more efficient PowerMOS devices extend the range of cars that can enjoy the benefits of EPS.

A next step in the evolution of steering systems will be steer-by-wire, leading to further savings in weight, space and power. As part of the FlexRay Consortium, NXP is helping develop the technology to make this a reality.