Hitachi Construction Machinery Co., Ltd.

Daisuke Takagi

Yoshinori Furuno

Takanobu Ikari

Shinji Akino

Yoshinori Ohwada

An engine protection system for a construction machine can individually diagnose the exhaust temperature specific to each cylinder of an engine corresponding to an engine revolution speed in order to find an abnormal condition of each engine cylinder in advance. A revolution speed sensordetects revolution speed of an engine mounted in the construction machine and, a plurality, e.g.,, cylinder temperature sensors-detect exhaust temperatures of respective cylinders of the engine. A data recording unitand a display controllerstore the detected engine revolution speed and the detected exhaust temperatures of the respective cylinders. Trend data, which is produced based on the stored data, is sent to an office via a portable terminal and the display controlleroutputs, a signal for playing back and displaying snapshots based on the stored data to a display unitdisposed in the cab

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Kasumigaura, Japan

Daisuke Takagi