Hitachi Construction Machinery Co., Ltd.

Shintarou Tanaka

Masatsugu Arai

Naoki Fukuda

Takaaki Tanaka

Yukiaki Shimizu

A power regeneration system of a work vehicle includes: a first generator () and a second generator () that are driven by an engine (); a first electric circuit (C) for supplying electric power to traveling motors (L,R); a second electric circuit (C) for supplying electric power to an auxiliary device (); a voltage step down converter () providing electric power from the first electric circuit to the second electric circuit; and a controller () that determines whether a travel mode of the work vehicle is a powering mode or a regeneration mode in order to control driving of the voltage step down converter. If the travel mode is the regeneration mode, the controller provides the regenerative power from the first electric circuit through the voltage step down converter to the second electric circuit, in order to drive the auxiliary device with the regenerative power.

Power regeneration system of work vehicle

To provide a power regeneration system for a working vehicle that can effectively use a regenerative electric energy. A first electric circuit for supplying an electric power generated by the first generator to a traveling motor, a voltage detector for detecting an actual voltage of the first electric circuit, a second electric circuit for supplying an electric power generated by a second generator to an auxiliary device, a step-down device connected to the first electric circuit and the second electric circuit, and a controller are provided. The controller estimates the voltage of the first electric circuit after a predetermined time has elapsed from the present time, based on information on a traveling state of a work vehicle and the actual voltage detected by the voltage detector, and outputs a drive command to the step-down device when the estimated voltage is equal to or more than a threshold.

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Tokyo, Japan

Shintarou Tanaka