Eps-Electronic power steering

EPS-ELECTRONIC POWER STEERING

THIAGARAJANB.E Automobile EngineeringMIT

INTRODUCTION

• An electronic power steering (EPS) system 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 the engine speed resulting in power savings.

COMPONENTS1. ECU(ELECTRONIC CONTROL UNIT)2. TORQUE SENSOR3. ELECTRIC MOTOR4. REDUCTION GEAR

ELECTRONIC CONTROL SYSTEM SENSORS Torque SENSORS Angle sensor ELECTRONIC CONTROL UNIT ACTUATORS POWER SUPPLY

MECHANISM Electric power

steering (EPS or EPAS) uses an electric motor to assist the driver of a vehicle.

The force on the steering wheel causes a torsion bar in the steering gear to turn.

The torque sensor detects the rotation and sends the calculated steering force to the power steering control module(ECU).

CONT.. The steering angle sensor reports the

current steering angle and steering speed.

Depending on the steering force control module calculate the necessary assisting force and actuates the motor.

Depending upon the electric signal the motor runs and the motor is connected to the steering

rack and pinion steering.

CONT.. The motor engages in the steering rack

via a worm gear and drive pinion which transmits the

force required for steering assistance.

ACTIVE RETURN FUNCTION

CONT.. If the driver reduces the force on the

steering wheel during cornering ,torsion bar tension is relieved.

In conjunction with the reduced steering force inclusion of the steering angle and the steering speed a return speed is calculated .This is compared with the steering angle speed. This result of this is the returning force required.

CONT.. The return forces are applied on the steering

wheels as a result of the running gear layout. The return forces are often too weak ,due to friction in the steering system and in the axle to bring the wheels back to the center position.

Power steering control module calculates the necessary return force required and send the signals to the motor.

Then the wheels back into position.

ADVANTAGES OF EPS: No hydraulic components No hydraulic fluid Space savings Reduction in noise Energy savings No complex hose and wiring system

COMPARISION BN EPS HPS SIMPLE DESIGN LIGHTER WEIGHT LESS MAINTANENCE BETTER RESPONSE AT DIFFERENT

SPEED MORE MILEGE

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