State of charge estimation device and method of estimating state of charge
First Claim
1. A state of charge estimation device for estimating a state of charge of an electric storage device, the state of charge estimation device comprising:
- a memory storing data on a first correlation between an elapsed time since an end of charge/discharge of the electric storage device and an estimation error in estimation of the state of charge; and
a controller component configured to execute a first estimation process and a second estimation process repeatedly,the first estimation process being for estimating a first state of charge based on a terminal voltage of the electric storage device when the elapsed time since the end of charge/discharge of the electric storage device reaches a reference time and for determining a first estimation error of the electric storage device in the first state of charge based on the first correlation and the elapsed time,the second estimation process being for estimating a second state of charge based on an accumulated charge/discharge current of the electric storage device in a charge/discharge state and for determining a second estimation error of the electric storage device in the second state of charge,wherein the controller component is configured to;
calculate a total error from the first estimation error obtained in a previous execution of the first estimation process and the second estimation error obtained in a previous execution of the second estimation process; and
shorten the reference time in the first estimation process that is to be l executed next as the total error is greater.
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Abstract
The state of charge (SOC) estimation device includes a memory and a controller component. The memory stores data on a first correlation between an elapsed time and an estimation error in SOC estimation. The controller component executes a first estimation process and a second estimation process. The first estimation process is for estimating a first SOC and a first estimation error of the electric storage device in a non-charge/discharge state based on a terminal voltage and the elapsed time. The second estimation process is for estimating a second SOC and a second estimation error of the electric storage device in a charge/discharge state based on an accumulated charge/discharge current. The controller component calculates a total error from the first estimation error and the second estimation error. The controller component estimates the first estimation error when the elapsed time becomes equal to or longer than a reference time.
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Citations
15 Claims
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1. A state of charge estimation device for estimating a state of charge of an electric storage device, the state of charge estimation device comprising:
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a memory storing data on a first correlation between an elapsed time since an end of charge/discharge of the electric storage device and an estimation error in estimation of the state of charge; and a controller component configured to execute a first estimation process and a second estimation process repeatedly, the first estimation process being for estimating a first state of charge based on a terminal voltage of the electric storage device when the elapsed time since the end of charge/discharge of the electric storage device reaches a reference time and for determining a first estimation error of the electric storage device in the first state of charge based on the first correlation and the elapsed time, the second estimation process being for estimating a second state of charge based on an accumulated charge/discharge current of the electric storage device in a charge/discharge state and for determining a second estimation error of the electric storage device in the second state of charge, wherein the controller component is configured to; calculate a total error from the first estimation error obtained in a previous execution of the first estimation process and the second estimation error obtained in a previous execution of the second estimation process; and shorten the reference time in the first estimation process that is to be l executed next as the total error is greater. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of estimating a state of charge of an electric storage device, the method comprising;
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a first estimation of a first state of charge based on a terminal voltage of the electic storage device when an elapsed time since an end of charge/discharge of the electric storage device reaches a reference time and for determining a first estimation error of the electric storage device in the first state of charge based on a first correlation between the elapsed time since the end of charge/discharge of the electric storage device and an estimation error in estimation of the state of charge and the elapsed time; and a second estimation of a second state of charge based on an accumulated charge/discharge current of the electric storage device in a charge/discharge state and for determining a second estimation error of the electric/storage device in the second state of charge; wherein the first estimation process includes; calculating a total error from the first estimation error obtained in a previous execution of the first estimation process and the second estimation error obtained in a previous execution of the second estimation process; and shortening the reference time in the first estimation process that is to be executed next as the total error is greater. - View Dependent Claims (15)
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Specification