Hitachi Construction Machinery Co., Ltd.

Yoshiyuki Takigawa

Shiho Izumi

Yuichiro Morita

Kouichi Shibata

Yasunori Ota

Kentaro Itoga

Taiki Aizawa

A hybrid work machine is configured with an engine, a hydraulic pump, a hydraulic actuator, a generator motorcoupled to the engine, an electric storage devicethat transmits and receives electric power to and from the generator motor, an engine controllerthat controls the enginebased on a target engine revolution speed, a power controllerthat controls action of the generator motor, a controllerthat controls the engine controllerand the power controller, and a target engine revolution speed change instructing device that give instructions on a change in the target engine revolution speed. The controllercontrols the engine controllerand the power controllerto act the generator motoras a generator until an actual revolution speed of the engineis reduced to a revolution speed corresponding to a target engine revolution speed after change if the target engine revolution speed has been changed to be lower while the engineis in an unloaded state. It is thereby possible to suppress noise of the engine in the case where the target engine revolution speed has been changed to be lower while the engine is in an unloaded state.

Hybrid work machine

A work machine that can prevent restarting of an engine against a will of an operator from an idle stop state is provided. A hydraulic excavator includes a display device that displays a confirmation screen image for allowing an operator to confirm whether or not an engine is to be restarted from an idle stop state, and an inputting device that allows the operator to input a restart instruction for the engine in an interlocked relationship with the display of the confirmation screen image. A machine controller includes a restart controlling section that restarts the engine based on the restart instruction for the engine inputted by the inputting device.

Work machine

Growing community of inventors

Tsuchiura, Japan

Yoshiyuki Takigawa