Hitachi Construction Machinery Co., Ltd.

Masamichi Itoh

Akihiro Narazaki

Teruki Igarashi

When a bucketis grounded on soil, an operation signal is outputted or corrected such that a relative angle of the bucketwith respect to a target surface is maintained if a distance D between the bucketand the target surfaceis equal to or less than a preset first threshold value D. When the bucketis not grounded on soil, the operation signal is outputted or corrected such that the relative angle of the bucketwith respect to the target surfaceis maintained if the distance between the bucketand the target surfaceis equal to or less than a preset second threshold value Dset smaller than the first threshold value D. As a result, control to maintain an angle of a work tool can be suitably started.

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Ushiku, Japan

Masamichi Itoh