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Automotive Electrical System Simulation and Control

by Robyn Jackey

 

28 Oct 2009 (Updated 05 Jun 2013)

A conventional vehicle electrical system model with alternator, battery, loads, and idle control.

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Description

This model shows an example of a conventional vehicle electrical system model, which was shown in the webinar "Optimizing Vehicle Electrical Design through System-Level Simulation" https://www.mathworks.com/wbnr70020. The model is intended to study component sizing, selection, and control.

The electrical system model contains a Simscape lead-acid battery model as described in SAE Paper 2007-01-0778 http://www.mathworks.com/tagteam/40542_SAE-2007-01-0778-Battery-Modeling-Process.pdf. There are two choices for battery size.

The model also contains data-driven alternator model options using either look-up tables or Model-Based Calibration Toolbox blocks. The alternator model is described in SAE Paper 2007-01-3471.

Control may be added to monitor the system condition, and increase idle speed to compensate for bad conditions in the vehicle charging system.

Vehicle loads are modeled as variable resistive elements.

Acknowledgements

This file inspired Lithium Battery Model, Simscape Language And Simulink Design Optimization.

Required Products Simscape
Simulink
MATLAB release MATLAB 7.9 (R2009b)
Other requirements Optional requirements: Stateflow Model-Based Calibration Toolbox
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alternator(6), automotive(3), battery(8), control design, demo(2), electrical(3), optimization, simulation, simulink(2), vehicle
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Comments and Ratings (4)
03 Apr 2013 Robyn Jackey

Hi David,

Roughly speaking, change the Costar parameter (capacity at 0°C – I think units are either Amp-seconds or Amp-hours) to match the capacity you want. Other resistance parameters may be inversely proportional to the change in capacity, so if you cut the capacity by half you would double the resistances.

If you need a detailed match to a specific model of battery, it gets a bit more complicated. I offer consulting service to help teach techniques to match the model to measured data.

-Robyn

02 Apr 2013 David

The model is good, I am just wondering how to get a lower A/h battery like 21 A/h?

02 Jul 2012 Arpita  
30 Jun 2010 Charlene (Fatima) Leung-Wai  
Updates
02 Dec 2009

Updated model settings.

07 Dec 2009

updated broken webinar link in description

07 Dec 2009

Minor update to directions in Readme.txt.
Changed solver setting to "nonadaptive" to avoid warnings.

05 Nov 2012

Updated the description with new webinar link. Referenced alternator paper available from SAE.

05 Jun 2013

Added an updated model for R2012b and later.

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