Mitsubishi Heavy Industries Limited

Mitsubishi Nichiyu Forklift Co., Ltd.

Tomohiro Akaki

Kensuke Futahashi

Takaharu Hiroe

Kiyomitsu Ogawa

Masataka Kawaguchi

Yoshimi Okazaki

Fujio Eguchi

Yutaka Kubota

Kazuhito Kawashima

Keizo Ogino

Shingo Yuguchi

Michio Akao

Hiroshi Satou

A control method for an industrial vehicle can appropriately set a charge amount for a battery, and an industrial vehicle are provided. The control method includes an estimation step that estimates the charge rate of a battery by calculating the current that is charged to the battery and the current that is discharged from the battery; a charge amount determining step that determines the charge amount of the battery based on the estimated charge rate; a correction amount determining step that determines the charge power that is necessary for motors to generate the determined charge amount as a correction amount for the power that is supplied by the engine; and an addition step that adds the charge power to the supplied power of the engine that has been determined based on the state of the traveling and load-handling.

Control method for industrial vehicle and industrial vehicle

An industrial vehicle having a hybrid system controls a distribution of power generated by an engine and power generated by an electric motor. The vehicle includes an engine for supplying power to one of a running unit and a loading-and-unloading unit; a first motor for supplying power to one of the running unit and the loading-and-unloading unit; a second motor for supplying power to the running unit; a required-power calculating unit for calculating running power, and loading-and-unloading power; a clutch unit for controlling the power transmitted from the engine to the running unit; and a power-distribution calculating unit for selecting a destination to be supplied with power from the engine and the first motor based on the control status of the clutch unit, and for calculating a distribution of power which the engine, the first motor, and the second motor supply based on the calculating running power and loading-and-unloading power.

Industrial vehicle and power control method for the same

An energy recovering system in a hydraulic lift device of a battery operated industrial truck. With the system, working oil can be supplied to other hydraulic actuators while energy recovering operation is performed by the hydraulic lift device, occurrence of pressure pulsation in the working oil can be prevented, and energy recovering efficiency is increased. The hydraulic lift device comprises a lift cylinder () for lifting a fork F, an electric motor () rotated by power supply from a battery (), a hydraulic pump () for supplying pressurized oil to the lift cylinder (), a control valve () disposed in a pressurized oil supply path (), and a controller (). The controller () controls the opening of the control valve () and rotation speed of the electric motor () which functions as an electric generator driven by the hydraulic pump () rotated by the action of the pressurized oil returning from the lift cylinder () when a load is lowered so that the generated electricity charges the battery () to recover the potential energy of the load.

Energy recovering method and system in hydraulic lift device of battery operated industrial trucks

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Takasago, Japan

Tomohiro Akaki