Komatsu Corporation

Hiroshi Yoshimura

Koichi Kawamura

Kiwa Nishimura

Storage of data which changes during the operation of a construction machine and processing of data can be performed at a low cost by using existing sensors and switches mounted on the construction machine. In an operation section of a controller, each level for indicating a content of a detection signal of each sensor or an instruction signal of a switch is determined first. Then, the detection signal to be input is judged to belong to which of the respective levels at every sensor readout interval (sampling time), and a count value of the level to which the detection signal was judged to belong is processed to add for a portion of the sampling time. And, a time count value at every level stored in a storage section is read from the outside to perform the data processing.

Data storage of construction machine and data processor

The invention relates to a device whereby irrespective of the magnitude of the load the desired maximum flow QM is fed to the hydraulic actuator which drives the working part, thus allowing the working part to work at the desired speed. The flow rate through the flow rate control valves is controlled so that when the operation means is operated beyond a prescribed operating start position, the hydraulic actuators begin to be driven, the flow fed to the hydraulic actuators attaining a prescribed maximum when the operation means is operated to its maximum operating rate, while the rate of change of the flow fed to the hydraulic actuators reaches a prescribed magnitude for each fixed operating rate of the operation means. The rate of change of the flow rate is altered according to the magnitude of the load.

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Hirakata, Japan

Hiroshi Yoshimura