| 摘要 |
A controller for an electric power steering system which generates a steering assist force by an electric motor driven on the basis of a steering torque applied to an operation member. The controller calculates an assist target electric current value by adding a first inertia compensation value, generated in accordance with a first steering torque differential value corresponding to a time-based differential value of the steering torque, to a basic assist electric current value determined in accordance with the steering torque, and preferably by further adding thereto a second inertia compensation value. This second inertia compensation value may be generated in accordance with a second steering torque differential value determined as a time-based differential value of a steering torque component obtained by removing a high frequency component from the steering torque.
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