Automotive Electrical System Simulation and Control

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

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

[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

[David]

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

[Arpita]

 

[Charlene (Fatima) Leung-Wai]