Patent ID: 9745723
Date: 2017-08-29
CPC Classifications: B60L,E02F,H01M,H02J,Y02E,Y02P,Y02T

Claim:
1. A construction machine comprising: an inverter that controls a motor; a battery charged and discharged via the inverter; a battery controller configured to monitor charging and discharging of the battery; a main controller configured to control the inverter based on a plurality of limited power modes prescribed in order to limit an output of the battery; and a monitor that displays a remaining electric power of the battery, wherein the battery controller outputs open circuit voltage and battery resistance information as specification information about the battery, as well as a state of energy of the battery, into the main controller, wherein the main controller calculates an open circuit voltage value and a battery resistance value of the battery at the state of energy of the battery based on the specification information about the battery and the state of energy of the battery which are output from the battery controller, calculates an amount of electric power stored in the battery in each of the limited power modes based on the open circuit voltage value and the battery resistance value of the battery as well as limited power and operating voltage prescribed for each of the limited power modes, and outputs a display signal for displaying the amount of electric power stored in the battery in each of the limited power modes into the monitor, wherein the plurality of limited power modes include a first mode and a second mode, a limited power of the second mode being smaller than a limited power of the first mode, wherein the main controller automatically switches the limited power mode from the first mode to the second mode when the first mode is selected as the limited power mode and when a battery voltage of the battery reaches a minimum operating voltage in the first mode, wherein the monitor displays a first meter part and a second meter part when the first mode is selected as the limited power mode, the first meter part indicating a remaining electric power in the first mode, the second meter part indicating a remaining electric power in the second mode after the main controller automatically switches the limited power mode from the first mode to the second mode, and wherein the first meter part and the second meter part are displayed in a contiguous fashion on a display of the monitor with a boundary position therebetween indicating a position where the main controller is to automatically switch the limited power mode from the first mode to the second mode.