Patent ID: 8798875
Filing Date: 2014-08-05
Classification: B60K,B60L,B60W,B60Y,B66C,B66F,E02F,H05K,Y02T

Abstract:
1. 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.