Abstract :Steering and braking are the most critical safety factors in vehicular control.

Safe operation of the vehicle demands that the operator be able to maintain absolute control of the vehicle‘s critical operating dynamics: (1) Control of the direction of motion of the vehicle (steering) (2) Control of the velocity of the vehicle, i.e. the ability to slow and fully stop the vehicle (braking) .

This presentation provides an overview of electric assisted vehicular steering including brief description of various conventional systems and the basics of steering; particular attention in addressed to ―Electric Power Assisted Steering (EPAS)‘‘. Electric power assisted steering has temped automotive engineer since the 1950.

Even so, the promise of smaller, lighter, and more efficient systems never quite matched the low cost and performance of hydraulic power assisted steering (HYPAS) advance in microelectronics; however have rekindled interest in EPAS.

Motor drive stages, electronic control units and torque sensor can now be manufactured relatively cheaply. These components, coupled with complex control algorithms implemented in software can rival or better the performance and functionality of conventional hydraulic steering systems.

In addition, software can be fine tuned to deliver the desired mix of stability, robustness, and steering ‗‘feel‘‘.
please find the following attachments "electric power assisted steering pdf" here