Abstract
Technologies in steering systems have been advancing since the adoption of hydraulic power steering in automobiles in the 1950s. Steering systems are turning to electronic control in order to meet market needs such as improved fuel efficiency, safety and comfort. An EPS system is equipped with an electric motor to provide assist steering torque and utilizes a torsion bar associated with a sensor to measure the driver torque and apply it as a command to the steering torque control loop. Traditional hydraulic power steering systems have provided remarkable performance for many years in terms of handling, cost, and comfort. However, these systems have the drawback of adding load on the engine. The hydraulic pump runs regardless of whether steering assistance is required or not, in fact the power needed to run the pump is highest at high speed, when the least required steering assistance is required. Automotive manufacturers are moving to Electric power Steering (EPS) to provide the convenience of steering assist with a smaller engine and reduced fuel consumption. This paper defines the methodology to implement an India specific EPAS system in small car. This paper includes concept study, design of mechanical column, control strategy, torque sensor integration, motor integration, and prototype development along with performance trials on vehicle. The performance of developed system was evaluated.