ELECTRIC POWER STEERING (EPS)
06–13–9
06–13
Operation
Motor current control
• The proper assist current is calculated based on the steering force signal from the torque sensor, and the
vehicle and engine speed signals from the PCM, and then the control current is output to the EPS motor.
• Also, various control corrections are performed according to vehicle driving conditions.
— Base current control
• The base current is the fundamental
current amount for driving the EPS motor
and is calculated based on the steering
force and vehicle speed signals.
— Inertia correction control
• The inertia correction control
compensates for the influence caused by
the motor body of revolution inertia
(insufficient torque when starting, torque
continuance when stopping). The
correction current to the base current is
either increased or decreased according
to vehicle conditions.
• Inertia correction control is calculated
based on the steering force and vehicle
speed signals, and the motor speed.
— Damping correction control
• The damping correction control reduces
slight vibrations transmitted from the road
surface (kickback) using the motor control
current. The correction current to the base
current is either increased or decreased
according to vehicle conditions.
• The damping correction control is
calculated based on the steering force
and vehicle speed signals, and the motor
speed.
STEERING TORQUE
VEHICLE SPEED
(HIGH)
0
MOTOR
CONTROL
CURRENT
CHU0613S007
STEERING FORCE DERIVATIV
VEHICLE SPEED
(HIGH)
0
CORRECTIVE
CURRENT
VEHICLE
SPEED
(LOW)
CHU0613S008
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