EcmParamEstimator

Estimate ECM parameters from pulse-test data and build lookup tables.

This class estimates Equivalent-Circuit Model (ECM) parameters using results from a PulseTestEmulator and organizes them into lookup tables across state of charge (SoC), ambient temperature, and C-rate for both charge and discharge conditions.

Syntax

obj = EcmParamEstimator(pulseEmulatorObj, thetaInit, thetaLB, thetaUB)

Constructor Input Arguments

Name	Type	Description
`pulseEmulatorObj`	`PulseTestEmulator`	Source of pulse test inputs/results.
`thetaInit`	`double`	Initial parameter vector with odd length ≥ 3 in the form `[R0, Rp1,...,Rp_n, tau1,...,tau_n]`.
`thetaLB`	`double`	Lower bounds, same size as `thetaInit` (all ≥ 0).
`thetaUB`	`double`	Upper bounds, same size as `thetaInit` (strictly greater than `thetaLB`).

Methods

Name	Description
`Run_Parameterisation()`	Fits ECM parameters for all `(SoC, Temp, C-rate)` breakpoints and populates LUTs.

Properties

Name	Type	Description
`pulseEmulatorObj`	`PulseTestEmulator`	Pulse-Based Model input object.
`modelOrder`	`double`	ECM order `n` where `n = (numel(thetaInit) - 1)/2`.
`thetaInit`	`double`	Initial parameter guess.
`thetaBounds`	`struct`	Struct with fields `.lb` and `.ub` for parameter bounds.
`ecmOptParameters`	`struct`	Fitted ECM parameter lookup tables for `charge` and `discharge`.
`paramNames`	`string`	Names of parameters stored in the LUTs (`R0`, `R1..Rn`, `tau1..taun`).

Fields of `ecmOptParameters.(pulseType)`

Field	Type	Description
`dim1_socBPs`	`double`	SoC breakpoints.
`dim2_tempBPs`	`double`	Ambient temperature breakpoints (°C).
`dim3_crateBPs`	`double`	C-rate breakpoints (positive for charge, negative for discharge).
`lookUpTables.R0`	`double array`	3D LUT for `R0` over `[soc, temp, crate]`.
`lookUpTables.R1..Rn`	`double array`	3D LUTs for `Rp` branches.
`lookUpTables.tau1..taun`	`double array`	3D LUTs for time constants.
`lookUpTables.ecmModelVoltFits`	`cell array`	Fit tables per grid point with columns `time`, `voltageEcmFit`, `voltagePhyModel`.

Examples

Basic Usage

% First-order ECM example (theta = [R0, Rp1, tau1])
thetaInit = [0.01, 0.02, 100];
thetaLB   = [0,    0,    1];
thetaUB   = [0.1,  0.1,  1e4];

est = EcmParamEstimator(pulseEmulatorObj, thetaInit, thetaLB, thetaUB);
est = est.Run_Parameterisation();

R0_lut = est.ecmOptParameters.discharge.lookUpTables.R0;