ELECTRIC POWER STEERING (EPS)
06–13–10
System overheating prevention control
• To prevent a malfunction of the system caused by overheating (due to motor over-speed or other factors), the
steering mechanism turning limit and cumulative value of the motor current are detected and the current output
to the EPS motor is controlled accordingly.
— Turning limit control
• The turning limit control detects the
turning limit of the steering mechanism
and when it is determined that the limit
has been reached, current output to the
EPS motor is reduced by approximately
one-half.
• Then, when it is determined that it is no
longer at the turning limit, the motor
current is returned to normal.
— Motor output limit control
• The motor output limit control detects the
cumulative value of the current output to
the motor, and if the steering mechanism
is turned from lock to lock continuously (or
similar repetitious operation), current output to the EPS motor is lowered.
• The motor current will gradually return to
normal after the steering torque is
detected at 0 N·m {0 kgf·cm, 0 in·lbf} or
the ignition switch is turned off. A
maximum of 15 min is required to return
to normal conditions.
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CONTROLLER AREA NETWORK (CAN) OUTLINE
CHU061367880S02
• The EPS control module sends and receives data to and from other modules via the CAN. Refer to Section 09
for a detailed explanation of the CAN.
Transmitted information
• EPS warning light ON request
• Idle speed increase request
Received information
• Vehicle speed
• Engine speed
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TURNING LIMIT
DETECTED
NOT AT
TURNING LIMIT
TIME
RETURN
MOTOR OUTPUT (%)
100
0
CHU0613S010
TURNING BACK
AND FORTH
STARTS
CONTROL
STARTS
100
0
MOTOR OUTPUT (%)
TIME
100
0
CURRENT CONTROLLED
TO RETURN
(MAX. 15 MIN)
RETURN
STARTS
MOTOR OUTPUT UNDER LIMITED CONTROL
MOTOR OUTPUT RETURNING
CUMULATIVE
CURRENT
OBSERVED
MOTOR OUTPUT (%)
TIME
RETURN TO
NORMAL
CHU0613S011
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