System Operation
Manual Steering Operation
Steering wheel input rotates the pinion of the gearbox through a universal joint. Due to the rack and pinion mechanism,
the rotation of pinion is converted into a transverse motion at the rack, which steers the front wheels throught the tie-rods
and knuckles the same as an ordinary rack and pinion system.
Assisting Operation
In addition to the manual steering operation, the steering sensor on the pinion shaft transmits a signal to the EPS control
unit when it receives a steering input. The EPS control unit calculates an adequate motor control with addition of vehicle
speed signals. Based on the signal from the sensors, the EPS control unit drives the motor inside the gearbox. The torque
generated by the motor is transmitted to a ball screw, through gears, and converted into an assisting thrust in the axial
direction of rack. The assisting thrust acts in the steering direction and lessens the steering force required at the steering
wheel.
EPS CONTROL UNIT
RECIRCULATING
BALL SCREW
STEERING WHEEL
RACK
STEERING SENSOR
(Build in the rotation sensor
and torque sensor)
MOTOR
STEERING GEARBOX
Manual Steering Operation
Steering wheel input rotates the pinion of the gearbox through a universal joint. Due to the rack and pinion mechanism,
the rotation of pinion is converted into a transverse motion at the rack, which steers the front wheels throught the tie-rods
and knuckles the same as an ordinary rack and pinion system.
Assisting Operation
In addition to the manual steering operation, the steering sensor on the pinion shaft transmits a signal to the EPS control
unit when it receives a steering input. The EPS control unit calculates an adequate motor control with addition of vehicle
speed signals. Based on the signal from the sensors, the EPS control unit drives the motor inside the gearbox. The torque
generated by the motor is transmitted to a ball screw, through gears, and converted into an assisting thrust in the axial
direction of rack. The assisting thrust acts in the steering direction and lessens the steering force required at the steering
wheel.
EPS CONTROL UNIT
RECIRCULATING
BALL SCREW
STEERING WHEEL
RACK
STEERING SENSOR
(Build in the rotation sensor
and torque sensor)
MOTOR
STEERING GEARBOX