Hitachi Construction Machinery Co., Ltd.

Kiyoshi Ono

Genroku Sugiyama

Hiroshi Watanabe

Hideo Karasawa

Osamu Tomikawa

Hiroyuki Adachi

Toichi Hirata

Koichi Shibata

Hiroshi Onoue

Hiroshi Ogura

Shuichi Miura

Yasushi Ochiai

Yoshiyuki Umeno

Assessment information needed to calculate a used vehicle assessment value of a hydraulic excavatoris input to a portable telephoneand is then transmitted from the portable telephone. The transmitted assessment information is received at a manufacturer's base stationat a remote location. The used vehicle assessment value of the hydraulic excavatoris calculated based upon the received assessment information, and history information and operation information on the hydraulic excavatorread out from an operation information databaseand a history databasein correspondence to an ID number assigned to the hydraulic excavator which is included in the assessment information.

Construction machine management apparatus and construction machines management system

A working machine failure diagnosis method for performing a failure diagnosis by transmitting and receiving signals through communication devices provided at a working machine and at an information management center, according to the present invention, includes: a first step in which a first signal related to a failure of the working machine is generated at the working machine and the first signal is transmitted to the information management center from the working machine via the communication devices; a second step in which, after the first signal is transmitted, the information management center generates a second signal for identifying a location of the failure based upon the first signal and the second signal is then transmitted from the information management center to the working machine via the communication devices; and a third step in which failure information corresponding to the first signal and the second signal is provided to an operator.

Working machine, trouble diagnosis system of working machine, and maintenance system of working machine

A security system for a construction machine including a construction machine equipped with a body controller for storing a first password, management apparatus arranged in a location apart from the construction machine and a portable communications unit for storing a second password provided communicably with the management apparatus and the body controller. The portable communications unit, receiving the first password from the management apparatus, replaces the second password with the first password. The body controller determines whether the second password output from the portable communications unit coincides with the first password. In case these passwords coincide with each other, an engine drive signal is output. Otherwise the engine is kept inoperable. This prevents possible theft of a construction machine.

Security system of construction machinery

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Adachi, Japan

Kiyoshi Ono