| 摘要 |
A problem to be solved by the present invention is that, in a conventional system for controlling electric power steering, as the number of revolutions of a motor is increased, an assist force decreases, resulting in faulty steering response. For solving the problem, the present invention provides a system for controlling electric power steering which includes the following features: an electric motor 6; steering-torque detection means 8 for detecting steering torque; basic assist command-value determination means 10 for determining an basic assist command value on the basis of the steering torque signal; differentiation command-value determination means 11 for determining a differentiation command value on the basis of the steering torque signal; vehicle-speed detection means 9 for detecting vehicle-speed; field-current determination means 13 for determining field-current for the electric motor in response to a vehicle-speed signal; and motor-current control means 12 for controlling the electric motor 6, in which the motor-current control means 12 controls output of the electric motor 6 in response to the field-current control signal from the field-current determination means 13 and a torque-current control signal for the electric motor 6 fixed by the basic assist command value and the differentiation command value.
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