Working machine
AssigneesSumitomo Heavy Industries, Ltd., Sumitomo(S.H.I.) Construction Machinery Co., Ltd.
InventorsMakoto Yanagisawa, Hideaki Kanbayashi
Life of this patent
Estimating the term…
Abstract
A working machine includes: a first electric motor used for work; a second electric motor used for applications other than work; a first inverter circuit connected to the first electric motor; a second inverter circuit connected to the second electric motor; a battery connected to the first and second inverter circuits; and a control unit that drives the first and second inverter circuits. The control unit has a discharge mode to discharge electric power stored in the battery, and discharges the battery by stopping the first inverter circuit while driving the second inverter circuit in order to make the second electric motor perform electric operation in the discharge mode. Accordingly, since the state of charge is reduced, the life of a capacitor can be increased.
Claims20
A working machine comprising:
- an operating element;
- a first electric motor used for work;
- a second electric motor used for applications other than work;
- a first inverter circuit connected to the first electric motor;
- a second inverter circuit connected to the second electric motor;
- an electrical energy storage device connected to the first and second inverter circuits;
- and
- a control unit that drives the first and second inverter circuits so as to control a state of charge of the electrical energy storage device,
- wherein the control unit is configured to set a predetermined first state of charge for driving the operating element and a predetermined second state of charge lower than the first state of charge as targets for controlling the state of charge of the electrical energy storage device,
- wherein the control unit has a discharge mode to discharge electric power stored in the electrical energy storage device, and
- wherein the control unit discharges the electrical energy storage device so as to reduce to the predetermined second state of charge by stopping the first inverter circuit while driving the second inverter circuit in order to make the second electric motor perform electric operation in the discharge mode when the operating element is not driven.
A working machine comprising:
- an operating element:
- an electric motor used for applications other than work;
- an inverter circuit connected to the electric motor;
- an electrical energy storage device connected to the inverter circuit;
- and
- a control unit that drives the inverter circuit so as to control a state of charge of the electrical energy storage device,
- wherein the control unit is configured to set a predetermined first state of charge for driving the operating element and a predetermined second state of charge lower than the first state of charge as targets for controlling the state of charge of the electrical energy storage device,
- wherein the control unit has a discharge mode to discharge electric power stored in the electrical energy storage device, and
- wherein the control unit discharges the electrical energy storage device so to reduce to the predetermined second state of charge by driving the inverter circuit in order to make the electric motor perform electric operation in the discharge mode when the operating element is not driven.
Dependencies are inferred from the claim text.