Control device for dynamometer system

A dynamometer system including a dynamometer, a shaft that connects the dynamometer and a test piece, a shaft torque sensor that detects torque acting on the shaft, a rotation speed detector that detects a rotation speed of the dynamometer, an inertia compensation control device that generates a torque current command signal by executing an inertia compensation control based on a detection value of the shaft torque sensor and a detection value of the rotation speed detector such that an apparent inertia of the test piece observed from the test piece side diminishes by an amount corresponding to a correction coefficient, and an inverter that supplies electric power to the dynamometer according to the torque, the inertia compensation control device comprising:

• an integral operation amount calculation unit that calculates an integral value of a deviation between the detection value of the shaft torque sensor and a command value thereof, and calculates an integral operation amount by multiplying a sum of the integral value and a predetermined correction value by an integral gain;
• a correction value calculation unit that calculates the correction value by multiplying the detection value of the rotation speed detector by the correction coefficient;
• a non-integral operation amount calculation unit that calculates a non-integral operation amount that is an output of a predetermined transfer function, into which the deviation is input;
• and
• a totaling unit that generates a part of the torque current command signal by totaling the integral operation amount and the non-integral operation amount,
• wherein a transfer function Ge0(s), of the non-integral operation amount calculation unit, is defined by separating an integrator from a transfer function Ge(s), of a feedback controller that outputs a torque current command signal, so as to cancel the deviation when the deviation is input, so as to satisfy the following formula where Ki represents the integral gain of the integrator and s represents a Laplacian operator:
• Ge
• ⁡
• (
• s
• )
• =
• Ki
• s
• +
• Ge
• ⁢
• ⁢
• 0
• ⁢
• (
• s
• )
• .