Motor vehicles – Steering gear – With electric power assist
Reexamination Certificate
2005-03-01
2005-03-01
Hurley, Kevin (Department: 3611)
Motor vehicles
Steering gear
With electric power assist
C701S042000
Reexamination Certificate
active
06860361
ABSTRACT:
Conventionally, there was a problem that in cases when it is difficult to place a temperature sensor in the vicinity of a heat-generating portion, overheating could not be prevented. Disclosed is an electric power steering control system including a torque sensor for detecting steering force of a steering system; a motor current determination unit for determining the motor current based on the steering force detected by the torque sensor; a temperature sensor for detecting an ambient temperature; a coefficient setting unit for setting a coefficient in accordance with the detected temperature obtained by means of the temperature sensor; a motor current detection unit for detecting a motor current being passed to a motor; a maximum current limit value calculation unit for calculating a maximum current limit value based on the detected current and the coefficient; a current limiting unit for selecting the smaller value between the motor current determined by the motor current determination unit and the maximum current limit value calculated and outputting this as a target current; and a motor current control section for passing the target current to the motor in such a way that the motor current is equal to the detected current, whereby a motor current limit being set according to temperature is applied.
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Kifuku Takayuki
Ohmae Katsuhiko
Ohtagaki Shigeki
Takatsuka Yuji
Yamaguchi Norihiro
Hurley Kevin
Mitsubishi Denki & Kabushiki Kaisha
Sughrue & Mion, PLLC
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