1. Electric Motor
2. Reduction Gear
3. Torque Sensor
4. Vehicle Speed Sensor
5. ECU
6. Steering Angle Sensor
In the picture clear all the position of components.
Electric Control Unit(ECU) calculate the assisted torque on the bases of wheel position, vehicle speed and torque applied by driver on steering wheel.
then ECU give signal to electric motors which rotates the steering gear which reduce the torque required by driver.
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Electric Power Assisted Steering Works click here
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Power Assisted Steering (PAS) is a supplement the torque that deliver by driver to the steering wheel for turning. hydraulic and electric mechanism use for adding additional power to steering.When electric motor used for generating the power in steering wheel, this system called Electric Power Assisted Steering(ePAS)
Electric Power system (EPS) eliminates many hydraulic power system(HPS) components like the pump, hoses, fluid, drive belt. that's why EPS tend to be smaller and lighter than HPS.
EPS system have variable power assist, which provide more assistance at lower car speed and less assistance at higher speeds. it don't require any significant power to operate when no steering is required.
EPS system are four type based on the position of the assisted motor
1. C-EPS(Column Assist Type):- in this system, power assist unit, torque sensor, and controller all connected to the steering column.
2. P-EPS(Pinion Assist Type):- in this type, power assisted unit is connected to the steering gear's pinion shaft.
3. D-EPS(Direct Drive Type):- this system has low inertia and friction because the steering gear and assisted unit are single unit.
4. R-EPS(Rack Assist Type):- this unit connected to the steering gear.this unit used in heavy vehicle due to their relatively low inertia from reduction gear ratios.
To Know How ePAS system Works Click Here
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