APPARATUS FOR PARAMETER ESTIMATION

• US 20150051853A1
• Filed: 11/20/2012
• Published: 02/19/2015
• Est. Priority Date: 02/22/2012
• Status: Abandoned Application

• Current Assignee: Calsonic Kansei Corporation, KEIO University
• Original Assignee: Calsonic Kansei Corporation, KEIO University
• Inventors: Baba, Atsushi, Adachi, Shuichi, Kawaguchi, Takahiro
• Application Number:
  US14/353,793
• Publication Number:
  US 20150051853A1
• Time in Patent Office: Days
• US Class Current: 702/63
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements
• CPC Class Codes: G01R 31/387 Determining ampere-hour charge capacity or SoC
• CPC Class Codes: G06F 2111/10 Numerical modelling
• CPC Class Codes: G06F 30/20 Design optimisation, verification or simulation optimisation, verification or simulation of circuit designs G06F30/30
• CPC Class Codes: G06F 30/367 Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

Provided is an apparatus for parameter estimation that, when performing parameter identification of a mathematical model expressing a target system as a differential equation, can reduce the estimation error of the parameters insofar as possible. The apparatus for parameter estimation includes a mathematical model expressing a target system as a differential equation, an input signal detection unit that detects an input signal to the target system, an output signal detection unit that detects an output signal from the target system, and a parameter identification unit that performs system identification by taking the input signal and the output signal as input and using these signals to identify parameters used in a transfer function of the mathematical model. The parameter identification unit performs, simultaneously with the system identification, continuous-time system identification of initial values of the transfer function based on the input signal and the output signal.

Claims

1. An apparatus for parameter estimation, the apparatus comprising:

a mathematical model expressing a target system as a differential equation;

an input signal detection unit configured to detect an input signal to the target system;

an output signal detection unit configured to detect an output signal from the target system; and

a parameter identification unit configured to perform system identification by taking the input signal and the output signal as input and using the input signal and the output signal to identify a parameter used in a transfer function of the mathematical model, wherein

the parameter identification unit performs, simultaneously with the system identification, continuous-time system identification of an initial value of the transfer function based on the input signal and the output signal.

2. The apparatus according to claim 1, wherein

the parameter identification unit applies an SRIVC method to the continuous-time system identification.

3. The apparatus according to claim 1 or 2, wherein

the target system is a secondary battery,

the input signal is a charge/discharge current of the secondary battery, and

the output signal is a terminal voltage of the secondary battery.