Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle subsystem or accessory control
Reexamination Certificate
2009-06-02
2011-12-20
To, Tuan C. (Department: 3663)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle subsystem or accessory control
C180S443000, C318S432000
Reexamination Certificate
active
08082080
ABSTRACT:
An electric power steering (EPS) apparatus1includes a motor12, an EPS actuator10, a torque sensor14, and an ECU11. The EPS actuator10uses the motor12as a drive source to apply assist force to a steering system, thereby assisting a steering operation. The torque sensor14detects a steering torque τ of the steering system. The ECU11controls the operation of the EPS actuator10. Based on the steering torque τ detected by the torque sensor14, the ECU11computes a basic shift amount εts_b of the assist force applied to the steering system. The ECU11determines which one of returning, holding, and turning is the state of the steering operation. When the state of the steering operation is returning or holding, the ECU11executes compensation control for correcting the steering torque τ, which is used in the computation of the basic shift amount εts_b of the assist force, thereby increasing the assist force applied to the steering system. The ECU11subjects the steering torque shift control amount εts to a filtering process using a low pass filter, thereby inhibiting the steering torque shift control amount εts from sharply changing. When the state of the steering operation is turning, the ECU11changes a filter constant of the low pass filter so as to reduce the filtering effect.
REFERENCES:
patent: 5473231 (1995-12-01), McLaughlin et al.
patent: 5504403 (1996-04-01), McLaughlin
patent: 7828112 (2010-11-01), Kezobo et al.
patent: 2001/0023382 (2001-09-01), Kurishige et al.
patent: 2001/0052756 (2001-12-01), Noro et al.
patent: 2002/0092700 (2002-07-01), Kim et al.
patent: 2005/0182541 (2005-08-01), Tamaizumi et al.
patent: 2007/0227806 (2007-10-01), Wei
patent: 2008/0047775 (2008-02-01), Yamazaki
patent: 2008/0147276 (2008-06-01), Pattok et al.
patent: 2008/0208407 (2008-08-01), Tanaka et al.
patent: 2008/0262678 (2008-10-01), Nishimura et al.
patent: 2009/0055050 (2009-02-01), Onuma et al.
patent: 2009/0069981 (2009-03-01), Barthomeuf et al.
patent: 2011/0022272 (2011-01-01), Hung et al.
patent: 0 681 955 (1995-11-01), None
patent: 1 129 926 (2001-09-01), None
patent: 10-278827 (1998-10-01), None
patent: 2006-142932 (2006-06-01), None
patent: WO 2006/099483 (2006-09-01), None
patent: WO 2007/045735 (2007-04-01), None
U.S. Appl. No. 12/435,046, filed May 4, 2009, Tamaizumi, et al.
Aono Shinya
Hasegawa Jun
Kita Masayuki
Nambu Akira
Nishimura Akihiko
JTEKT Corporation
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
To Tuan C.
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