ELECTRIC POWER STEERING (EPS) MOTOR

id061300245600


Purpose, Function

•  The EPS motor is driven by the control current from the EPS CM (control module) and generates assist torque to manual steering mechanism.

Construction

•  The EPS motor is installed to the steering column with an integrated EPS CM.
•  The EPS motor is a brushless motor which consists of a three-phase star-connected stator, a permanent magnet rotor, and resolver sensor.
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Operation

•  Current flows from the EPS CM to the stator to rotate the motor axis which is integrated with the rotor.
•  A resolver sensor for detecting rotation angle is built into the EPS motor and outputs a motor rotation angle signal to the EPS CM.
•  The EPS CM switches the current flowing to each stator based on the rotation angle signal from the resolver sensor.

Fail-safe

DTC No.

Fail-safe function
C200D:1C
•  Control is maintained in the backup control and EPS warning alarm is sounded
―  If EPS system internal temperature increases above the specified value, the EPS CM disables assistance and stops the EPS warning alarm
•  Power steering malfunction indicator light: Flashes/Illuminated
C200D:64
•  Control is maintained in the backup control
•  Power steering malfunction indicator light: Illuminated
U2011:19
•  Control disabled
•  Power steering malfunction indicator light: Illuminated
U2011:1C
U2011:62
U2011:72
•  An open circuit malfunction is detected in the one phase of the three-phase stator in the EPS motor
―  Control is maintained in the backup control
•  Other malfunction detected in EPS motor internal circuit
―  Control disabled
•  Power steering malfunction indicator light: Illuminated
U2011:92
•  Control disabled
•  Power steering malfunction indicator light: Illuminated