| 摘要 |
<p>A first valve opening degree correction value computation unit (61) computes a correction value (first valve opening degree correction value (Δθ1*)) for the absolute value (|θB*|) of a valve opening degree command value (θB*) on the basis of a rotation speed deviation (ΔVP (= VP* - VP)) computed by a rotation speed deviation computation unit (75) in a pump driving motor control unit (70). A second valve opening degree computation unit (62) computes a correction value (second valve opening degree correction value (Δθ2*)) for the valve opening degree command value (θB*) on the basis of the sign of the valve opening degree command value (θB*) and the first valve opening degree correction value (Δθ*). A correction value addition unit (63) adds the second valve opening degree correction value (Δθ2*) to the valve opening degree command value (θB*) set by the valve opening degree command value setting unit (52).
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