Electric power steering device, and control method thereof

Details Electric power steering device, and control method thereof Electric power steering device, and control method thereof

2007-02-13

2010-02-16

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Automatic and/or with time-delay means

Movement, position, or limit-of-travel

C318S432000, C318S434000, C700S028000, C323S234000, C323S265000, C323S349000

Reexamination Certificate

active

07663330

ABSTRACT:
An actual detected current value and a target voltage value of an electric motor are subjected to a low-pass filter process, and amounts of change per time in the filtered actual current value and the filtered target voltage value are calculated. If the amount of change in the actual current value on the increase side is greater than a criterion value and the amount of change in the target voltage value on the decrease side is greater than a criterion value, it is judged that the stroke end has been reached. Then, the upper limit value of the target current value is set at the actual current value obtained in the immediately previous cycle of the feedback control, so as to prevent generation of unnecessary torque.

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