Title:
ELECTRIC POWER STEERING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2011/121792
Kind Code:
A1
Abstract:
A feedforward control section (152) computes a phase angle (θFF) of a voltage vector relative to axis "d", the voltage vector provided by an output voltage from a motor drive circuit (30) being expressed in a d-q coordinates system, based on a target absolute current value (|i|*), a voltage limit value (Vlim) for the motor drive circuit (30), and a rotational speed (ωr) of a motor (20). Based on the deviation (Δi) between the target absolute current value (|i|*) and an actual absolute current value (|i|), a feedback control section (155) computes a phase angle (θFB). For the motor drive circuit (30) to output a three-phase drive voltage, the electrical angle of which has been advanced by a phase angle of (θFF + θFB), a PWM control signal generation section (159) outputs a PWM control signal. When a big reverse input acts upon a steering mechanism (10), this allows the motor (20) to produce a high torque, thereby preventing a steering wheel (11) from being turned.
Inventors:
AOKI, Kenichiro (1 Toyota-cho, Toyota-sh, Aichi ., 〒4718571, JP)
Application Number:
JP2010/056110
Publication Date:
October 06, 2011
Filing Date:
March 29, 2010
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA (1 Toyota-cho, Toyota-shi Aichi, 71, 〒4718571, JP)
トヨタ自動車株式会社 (〒71 愛知県豊田市トヨタ町１番地 Aichi, 〒4718571, JP)
トヨタ自動車株式会社 (〒71 愛知県豊田市トヨタ町１番地 Aichi, 〒4718571, JP)
International Classes:
H02P6/08; B62D5/04; B62D6/00; B62D101/00; B62D113/00; B62D119/00
Attorney, Agent or Firm:
PROSPEC PATENT FIRM (12th Floor, NAGOYA-KS Building 1-18, Taiko 3-chome, Nakamura-ku, Nagoya-sh, Aichi 01, 〒4530801, JP)
Claims: