Kayaba Industry Company, Ltd.

Hisashi Tsuda

Noboru Shimizu

Naoto Shima

Tsunefumi Arita

Hideyasu Ihira

A steering speed-computing section () to differentiate a steering angle of a steering wheel from a steering angle sensor () to compute the steering speed signal, a low-pass filter () to cut high frequency components in the steering speed signal to output a correction steering speed signal, a switching section () to switch the cut-off frequency in the low-pass filter to be higher at the time of determining a high-speed steering condition, and a flow quantity-computing section () to compute a target flow quantity supplied to a power steering output section () based on the steering angle signal and the correction steering speed signal are provided to control a flow quantity of an operating oil supplied to the power steering output section () for the target flow quantity.

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Tokyo, Japan

Hisashi Tsuda