Title:
電動パワーステアリング装置
Document Type and Number:
Japanese Patent JP4247232
Kind Code:
B2
Abstract:
An electric power steering device changes the non-continuous, non-linear component in the duty ratio of the PWM signal versus motor current generated during steering wheel handle return into linear characteristics to suppress noise and allow a smooth and natural feeling during steering wheel handling. The electric control circuit(13) provided a current reference value calculator (22A) to calculate I ref , a current controller (22B) to obtain V ref2 , a compensation adder (25) to obtain a duty D1, and a current discontinuity compensator (24) in order to obtain a duty D2. A motor drive circuit (35) including an H bridge circuit whose upper stage FET (1) is driven by the duty D1, and whose lower stage FED (3) paired with the upper stage FET (1), is driven by the duty D2 to allow forming a continuous linear duty ratio characteristic in the duty ratio of the PWM signal versus the motor current.
Inventors:
Hideyuki Kobayashi
Toru Sakaguchi
Yuji Hara
Sakae Nejo
Toru Sakaguchi
Yuji Hara
Sakae Nejo
Application Number:
JP2005516302A
Publication Date:
April 02, 2009
Filing Date:
December 03, 2004
Export Citation:
Assignee:
Nippon Seiko Co., Ltd.
nsk Steering Systems Co., Ltd.
nsk Steering Systems Co., Ltd.
International Classes:
B62D6/00; B62D5/04; H02P7/03; H02P7/29; H02P7/291; B62D101/00; B62D119/00; B62D137/00
Domestic Patent References:
| JP62085763A | ||||
| JP10100914A | ||||
| JP2001151135A | ||||
| JP2002345295A |
Foreign References:
| WO2000074222A1 |
Attorney, Agent or Firm:
Kazuo Sadashige