Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle subsystem or accessory control
Reexamination Certificate
2005-05-24
2005-05-24
Zanelli, Michael J. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle subsystem or accessory control
C701S042000, C180S446000
Reexamination Certificate
active
06898497
ABSTRACT:
Electric power steering apparatus includes a steering torque detection section for detecting steering torque acting on a steering system, a motor for imparting steering assist torque to the steering system; a voltage raising circuit including a switching element to be driven by a voltage-raise controlling PWM signal; and a motor driving controller for setting a target current to be supplied to the motor on the basis of at least the detected steering torque, setting a motor-current controlling duty factor signal on the basis of the target current, operating a switching circuit on the basis of the duty factor signal to control a motor drive current, and driving the motor with the controlled current. CPU of the motor driving controller generates the PWM signal for controlling the voltage raising circuit.
REFERENCES:
patent: 6502024 (2002-12-01), Ishihara et al.
patent: 6639379 (2003-10-01), Matsushita et al.
patent: 6727669 (2004-04-01), Suzuki et al.
patent: 2002035992 (2002-02-01), None
Merchant & Gould P.C.
Zanelli Michael J.
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