Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

2007-10-15

2011-10-18

Winner, Tony H. (Department: 3611)

Motor vehicles

Steering gear

With electric power assist

C318S139000, C318S098000, C318S434000, C318S663000, C701S042000, C701S001000

Reexamination Certificate

active

08037964

ABSTRACT:
When stopping operation of an electric power steering apparatus, a motor relay is kept in an on-state even after a power supply relay is in an off-state. A drive control portion sets a target value of a d-axis current to a value other than zero and sets a target value of a q-axis current to zero, and performs a processing same as that at the time of rotating a motor. MOS-FETs contained in a motor driving circuit are controlled such that each of driving currents of the two phases or more is not zero and the brushless motor does not rotate even supplied with these driving currents. Electric charge accumulated in a capacitor is discharged via the MOS-FETs each in an on-state, a motor relay and the windings of the brushless motor. The electric charge accumulated in the capacitor may be discharged via the excitation coil of the motor relay.

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