Patent ID: 9203261
Filing Date: 2015-12-01
Classification: E02F,H01M,H02J,Y02E

Abstract:
1. An excavator comprising: an electric load; an electrical energy storage part that supplies stored electric power to the electric load; and a control unit that controls an amount of charge to the electrical energy storage part so that a state of charge of the electrical energy storage part is between an upper limit value and a lower limit value, wherein the control unit controls the amount of charge to the electrical energy storage part based on a changing trend of a plurality of detection values of the state of charge, the plurality of detection values being obtained over a predetermined time period, and wherein when a predetermined number of the plurality of detection values are consecutively determined to be greater than respective preceding detection values of the state of charge or when a predetermined number of the plurality of detection values are consecutively retained at the upper limit value, the control unit determines that the amount of charge is excessive and decreases a limit value for the amount of charge.