System Operation - Honda Acura NSX 1991 Service Manual

-System Operation
Manual Steering Operation
Steering wheel input rotates the pinion of the gearbox through the 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 control
unit when it receives a steering input. The control unit calculates an adequate motor control with addition of speed sig-
nals the two speed sensors, then transmits a control signal to the power unit. Based on the signal from the control unit,
the power unit drives the motor inside the gearbox. The torque generated by the motor is transmitted to ball screw through
gears and converted into an assisting thrust in the axial direction of rack. The assisting thrust acts in the steering direc-
tion and lessens the steering force required at the steering wheel.
POWER UNIT
RECIRCULATING
BALL SCREW
CONTROL UNIT
STEERING WHEEL