Power steering system in the vehicle enables the driver to steer the
wheels with some source of power other than the drivers manual force .
Power steering means power assisted steering.
Traditional power
steering systems are:
Hydraulic powering
systems (HPS)
The latest technological cross
we bear is:
Electric powering
systems (EPS)
Hydraulic Power Steering :
Components:
Hydraulic
control
valve
Pinion gear
Hydraulic
pressure
Rack housing
Hydraulic piston
HPS are designed to assist the operation of the rack bar by generating oil pressure in the pump
The internal cavity is divided into
two chambers by a sealed piston attached to the rack
Applying pressurized hydraulic fluid to one side of the piston while allowing fluid to return from the other side to a reservoir provides steering assistance.
A valve attached to the pinion gear controls the hydraulic fluid flow and helps to turns the wheels in the required direction
Electric Power Steering :
Components:
Pinion
shaft
Steering
torque
sensor
Rack and
pinion
housing
EPS works with the help of an electric motor and a control unit having some sensors .
The electric motor mounted to the side of the rack rotates a steering gear with an applied force that reduces the torque required from the driver.
The torque sensor attached to the pinion shaft signals a control computer when to provide assistance