Working machine
First Claim
1. A working machine comprising:
- an electric motor configured to drive a drive target and generate electricity;
a power storage device;
a charge-discharge control circuit which is configured to control charging and discharging of the power storage device and is connected to the electric motor; and
a controller configured to control the charge-discharge control circuit,wherein the controller obtains a calculation value of an internal resistance of the power storage device based on a measured value of an open circuit voltage of the power storage device, and a measured value of an inter-terminal voltage and a measured value of a charge-discharge current when the power storage device is charged and discharged, and obtains a correction value of the internal resistance by correcting the calculation value of the internal resistance based on the measured value of the open circuit voltage.
1 Assignment
0 Petitions
Accused Products
Abstract
An electric motor drives a drive target and generates electricity. A charge-discharge control circuit controls charging and discharging of a power storage device. A controller controls a charge-discharge control circuit. The controller obtains a calculation value of an internal resistance of the power storage device based on a measured value of an open circuit voltage of the power storage device, and a measured value of an inter-terminal voltage and a measured value of a charge-discharge current when the power storage device is charged and discharged, and obtains a correction value of the internal resistance by correcting the calculation value of the internal resistance based on the measured value of the open circuit voltage.
13 Citations
7 Claims
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1. A working machine comprising:
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an electric motor configured to drive a drive target and generate electricity; a power storage device; a charge-discharge control circuit which is configured to control charging and discharging of the power storage device and is connected to the electric motor; and a controller configured to control the charge-discharge control circuit, wherein the controller obtains a calculation value of an internal resistance of the power storage device based on a measured value of an open circuit voltage of the power storage device, and a measured value of an inter-terminal voltage and a measured value of a charge-discharge current when the power storage device is charged and discharged, and obtains a correction value of the internal resistance by correcting the calculation value of the internal resistance based on the measured value of the open circuit voltage. - View Dependent Claims (2, 3, 4, 5)
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6. A working machine comprising:
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an electric motor configured to drive a drive target and generate electricity; a power storage device configured to supply electric power to the electric motor; a charge-discharge control circuit which is configured to control charging and discharging of the power storage device and is connected to the electric motor; and a controller configured to control the charge-discharge control circuit, wherein the controller stores a value of an internal resistance at the time of a reference voltage of the power storage device, wherein the controller obtains a charging state of the power storage device based on a measured value of an inter-terminal voltage and a measured value of a charge-discharge current when the power storage device is charged and discharged, and the value of the internal resistance at the time of the reference voltage, and wherein the controller obtains a correction value which is obtained by correcting the value of the internal resistance at the time of the reference voltage based on a calculation value of the last open circuit voltage of the power storage device, obtains the calculation value of the open circuit voltage at the present time based on the correction value, and obtains the charging state of the power storage device based on the calculation value of the open circuit voltage at the present time. - View Dependent Claims (7)
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Specification