Title:
ELECTRIC POWER STEERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2013/077241
Kind Code:
A1
Abstract:
[Problem] To provide an electric power steering device which detects each phase current of a motor with a single-shunt current detection circuit, and reliably detects failures (abnormal states) in the current detection circuit with a simple configuration, thereby enhancing safety.
[Solution] The electric power steering device is provided with: a single-shunt resistor connected to an inverter; a control motor current detection circuit which is connected in a forward direction to both ends of the shunt resistor and detects the phase currents of a motor as control motor current detection values for assist control; and a diagnosis motor current detection circuit which is connected in a reverse direction to both ends of the shunt resistor and detects failures in the control motor current detection circuit. The electric power steering device detects each phase current of a motor with the single-shunt scheme to perform assist control, and has two systems of circuits which amplify the voltage across the ends of the shunt resistor.
Inventors:
KUMAGAI SHIN (JP)
FUKINUKI SHIGERU (JP)
FUKINUKI SHIGERU (JP)
Application Number:
PCT/JP2012/079610
Publication Date:
May 30, 2013
Filing Date:
November 15, 2012
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
B62D6/00; B62D5/04; H02M1/00; H02P21/22; H02P23/00; B62D101/00; B62D119/00
Domestic Patent References:
| WO2003078237A1 | 2003-09-25 |
Foreign References:
| JP2011130616A | 2011-06-30 | |||
| JP2006137280A | 2006-06-01 | |||
| JPH11252974A | 1999-09-17 | |||
| JP2009232569A | 2009-10-08 | |||
| JP2003059636A | 2003-02-28 | |||
| JPH03139193A | 1991-06-13 | |||
| JP2009131064A | 2009-06-11 | |||
| JP2009232569A | 2009-10-08 |
Other References:
See also references of EP 2784929A4
Attorney, Agent or Firm:
AGATA Yuzo (JP)
Yuzo Yasugata (JP)
Yuzo Yasugata (JP)
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Claims: