Hitachi Construction Machinery Co., Ltd.

Yousuke Yamanobe

Satoshi Nakamura

Youhei Toriyama

Kazunori Hoshino

Kunitsugu Tomita

Hidenobu Tsukada

Yuuki Gotou

Atsushi Kanda

A work machine includes: a work device; an operation device operating the work device; a first controller controlling operation of the work device on the basis of operation of the operation device; and a second controller determining that an auto idle condition is satisfied and performing auto idle control that decreases an engine revolution speed to an idle revolution speed in case the operation device is not operated for a predetermined time. The first controller diagnoses presence or absence of a failure in the first controller when supply of power to the first controller is started. The second controller performs power interruption control that interrupts the supply of the power to the first controller in case the auto idle condition is satisfied, and performs power supply control that starts the supply of the power to the first controller afterward.

Work machine

A load value W, which is a weight of a transportation target carried by a front work implement, is calculated based on a work load of a boom cylinderof the front work implement, and on posture information which is information associated with a posture of the front work implement. A load threshold T used for determining whether to recalibrate a load measuring system is changed in accordance with a posture index value which is an index associated with the posture of the front work implementand is obtained based on the posture information. Whether to recalibrate the load measuring system is determined based on the load value W and the load threshold T. A determination result is displayed on a display screento notify an operator of the determination result. In this manner, deterioration of measuring accuracy is more appropriately detectable regardless of variations of a posture of a front work implement of a work machine.

A controller () calculates, based on a target loading weight (P) that is a target value of a total weight of working objects to be loaded into a hauling vehicle, a set loading time number indicative of a loading time number required for the construction machine before the target loading weight (P) is reached and bucket shape information indicative of a shape of a bucket (), an appropriate loading weight (W) that is an appropriate value of the weight of the working objects to be loaded into the hauling vehicle by a single time loading work by the construction machine, creates an appropriate amount illustration () that is an illustration of a state at which the working objects of the appropriate loading weight (W) are loaded into the bucket and that illustrates the state of the working objects, based on the appropriate loading weight (W) and the bucket shape information, and controls a display device () to display an illustration () of the bucket () and the appropriate amount illustration () in a superimposed relationship.

Construction machine including a display device displaying the weight of a work object

A hydraulic excavator () including a controller () having a load computing section () configured to compute a load of a work target material on the basis of thrust information about a boom cylinder () during the period when a front work implement () is performing a transporting operation of a work target material, the controller () further including: a velocity limiting value computing section () configured to compute a limiting value (Vlim) of a velocity of a boom cylinder () on the basis of posture information about the work implement () at a time of starting the transporting operation; a velocity command correction section () configured to correct a velocity command in such a manner that the velocity of the boom cylinder is equal to the limiting value (Vlim) when the velocity of the boom cylinder exceeds the limiting value and output the corrected velocity command; and a drive signal generation section () configured to generate and output a drive signal for the boom cylinder on the basis of the velocity command output from a velocity command correction section.

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Ushiku, Japan

Yousuke Yamanobe