Calsonic Kansei Corporation

Keio University

Kyoto University

Olympus Corporation

Marelli Corporation

Shuichi Adachi

Atsushi Baba

Ichiro Maruta

Kensuke Osamura

Takahiro Kawaguchi

Tomoyuki Sato

Junpei Katashiba

Risako Sasaki

Tasuku Takagi

A system identification method executed by a system identification device that estimates a response of a system having a current flowing in a battery as input and an overvoltage of the battery as output, comprises: a first step of identifying the system by applying a model of the battery including a FIR model and an ARX model to the system, based on time series data of each of the current flowing in the battery and the overvoltage of the battery in a predetermined period; and a second step of estimating, based on the model of the battery, the overvoltage of the battery output from the system at an estimation target time after an input start time in the case where no current is input before the input start time and the current is input to the system from the input start time onwards.

System identification method and system identification device

An image blurring correction apparatus includes: an optical system that forms a subject image on an image formation plane; an acceleration sensor that detects an acceleration of an apparatus that has the image formation plane; a first calculation circuit that calculates a first state quantity by using the acceleration; a second calculation circuit that calculates, as a second state quantity, an estimate value obtained by estimating a true value of the first state quantity by using the first state quantity and a model; and a third calculation circuit that calculates an amount of image blurring on the image formation plane by using the second state quantity.

Image blurring correction apparatus, image blurring correction method, and recording medium having image blurring correction program recorded therein

A battery's state of charge estimation apparatus will be provided. The battery's state of charge estimation apparatus includes: a charge and discharge current detection unit; a terminal voltage detection unit; an open circuit voltage method state of charge estimation unit for estimating an open circuit voltage of the battery and an open circuit voltage method state of charge; a current integration method state of charge estimation unit for obtaining a current integration method state of charge as a state variable; and an error correction value calculation unit for calculating an error correction value for correcting the current integration method state of charge. The current integration method state of charge estimation unit corrects the current integration method state of charge by using the error correction value.

Battery's state of charge estimation apparatus

A device for estimating parameters of battery capable of improving, by using simple calculations, estimation accuracy of a parameter and the like of a battery equivalent circuit model will be provided. The device for estimating parameters of battery for estimating the parameter of a battery () includes: a battery equivalent circuit model (A) including resistance and a capacitor as the parameter; a logarithmic conversion parameter value estimation unit (B) for sequentially estimating, by using a logarithmic conversion parameter value serving as a state variable obtained by carrying out logarithmic conversion on the parameter, the logarithmic conversion parameter value with a Kalman filter () from a state equation and an output equation, based on a charging/discharging current and a terminal voltage those being detected; and an inverse logarithmic conversion unit (C) for obtaining, from the logarithmic conversion parameter value, an estimated parameter value serving as an antilogarithm corresponding to the logarithmic conversion parameter value.

Device for estimating parameters of battery, and estimation method

An apparatus and method for battery parameter estimation estimate the parameters of a battery equivalent circuit model while reducing the computation load. The apparatus includes a charge/discharge current detector () that detects a charge/discharge current value of a battery (); a terminal voltage detector () that detects a terminal voltage value of the battery (); and an estimator () that estimates, based on the charge/discharge current value and the terminal voltage value, parameters in a battery equivalent circuit model () that approximates the Warburg impedance of the battery ().

Battery parameter estimation device and parameter estimation method

A battery SoC estimation device includes a discharge-and charge current detection means, a terminal-voltage detection means, a current-integration SoC estimation means, an open-circuit-voltage SoC estimation means, an error estimation means, and an SoC calculating means. The estimation meansestimates a current-integration-method SoC (SoC), calculating variance of current-integration-method SoC based on information on detection accuracy of the detection means. The estimation meansestimates an open-circuit-voltage-method SoC (SoC) corresponding to an open circuit voltage value estimated based on a discharge-and-charge current value and a terminal voltage value, using a battery equivalent circuit model. The estimation meansestimates an estimate error nof the current-integration-method SoC based on a difference between the SoCand the SoC, variance of the SoC, and variance of the SoC. The calculating meanscalculates SoC of a battery based on the SoCand the n.

Battery SoC estimation device

A parameter estimation device includes an input signal detecting meansthat detects an input signal inputted to an object systemexpressed by an equivalent circuit modelA containing at least an integrator element C, an output signal detecting meansthat detects an output signal outputted from the object system, an output differentiating meansthat differentiates the output signal to obtain and output an output differential signal, a modified equivalent circuit modelB where respective elements of the equivalent circuit modelA are changed to non-integrator elements in such a way that the output when the input signal is inputted becomes an output differential signal, and an element parameter estimating meansthat estimates the parameters corresponding to the respective elements based on the modified equivalent circuit model by using the signals.

Parameter estimation device

An apparatus and method for battery state of charge (SOC) estimation can reduce the estimation error in the battery SOC. The apparatus includes a charge/discharge current detection unit, a terminal voltage detection unit, a first estimation unit that estimates a first SOC by integrating the charge/discharge current value, a second estimation unit that estimates an open circuit voltage value from the charge/discharge current value and the terminal voltage value and estimates a second SOC from the open circuit voltage value, a first difference calculation unit that calculates a SOC difference between the first SOC and the second SOC, an error estimation unit that estimates, based on the SOC difference, an error as a state quantity of an error model by using the error model, and a second difference calculation unit that calculates a SOC of the battery by subtracting the error from the first SOC.

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Yokohama, Japan

Shuichi Adachi