ELECTRICAL STEERING SYSTEM TO REDUCE DRIVER FATIGUE

Abstract

Electrically powered steering uses an electric motor to drive either the power steering hydraulic pump or the steering linkage directly. The power steering function is therefore independent of engine speed, resulting in significant energy savings. But there may be certain problems because when the vehicle is running, if the engine is not functioning, the steering may not work. This may cause many problems. In this project, a steering sensor is located on the input shaft where it enters the gearbox housing. The steering sensor is actually two sensors in one: a torque sensor that converts steering torque input and its direction into voltage signals, and a “rotation sensor” that converts the rotation speed and direction into voltage signals. An interface circuit that shares the same housing converts the signals from the torque sensor and rotation sensor into signals the control electronics can process. Inputs from the steering sensor are digested by a microprocessor control unit that also monitors input from the speed sensor of the vehicles. The sensor inputs are then measured up to determine how much power assist is required according to a preprogrammed force map in the memory of the control unit. The control unit then sends out the appropriate signal to the power unit which then supplies the electric motor with current. The motor pushes the rack to the right or left depending on which way the voltage flows (reversing the current reverses the direction the motor spins). Increasing the current to the motor increases the amount of power assist.

Existing System

Proposed System

Architecture

BLOCK DIAGRAM

LINE DIAGRAM