Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

2007-07-10

2007-07-10

Morris, Lesley D. (Department: 3611)

Motor vehicles

Steering gear

With electric power assist

C180S446000, C318S807000, C318S609000

Reexamination Certificate

active

10865869

ABSTRACT:
In a current control system for a cylindrical permanent magnet synchronous motor as the drive source of an electric power steering apparatus, proportional gain Kdp and integral gain Kdi of a d-axis current PI control portion126are respectively set to K1·Ld and K1·Rd on the basis of d-axis inductance Ld and d-axis resistance Rd of the motor. Further, proportional gain Kqp and integral gain Kqi of a q-axis current PI control portion128are respectively set to K2·Lq and K2·Rq on the basis of q-axis inductance Lq and q-axis resistance Rq of the motor (K1 and K2 are optional coefficients). In this case, both of the d-axis resistance Rd and the q-axis resistance Rq have values resulting from adding the external resistance R′ including wiring resistance to the internal resistance R of the motor.

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European Search Report dated Feb. 24, 2005.

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