| 摘要 |
PROBLEM TO BE SOLVED: To provide a steering control system of a vehicle capable of achieving both provision of an excellent steering feeling and reduction in a maneuvering force in a case where an electric motor is two-phase-driven.SOLUTION: When a conduction fault occurs in any of the phases of a three-phase EPS motor, a second current control arithmetic unit 37 computes phase voltage command values Vu**, Vv**, and Vw** by implementing phase current feedback control. At this time, an electrical angle correction block 371 adds a correction quantity λ to an electrical angle Θ of the EPS motor inputted from an electrical angle arithmetic unit 34, and thus computes a corrected electrical angle x. Herein, the correction quantity λ is determined as λ0=0.55(rad) that is an optimal value. A phase current arithmetic block 372 uses the electrical angle Θ, which is corrected with the correction quantity λ, to compute a phase current command value iX* for two-phase driving. An F/B control block 375 implements feedback control so as to cause an actual phase current iX to follow the command value iX*. |
