SOC Estimate Calculation of Calculation

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Rohan Doijode
Rohan Doijode on 16 May 2020
Answered: Mike Sasena on 5 Oct 2023
I'm Rohan Doijode, working as a Design Engineer.
I'm trying to simulate an electric vehicle in MATLAB using Simulink, Simscape Driveline, Simscape Electrical and Powertrain blockset.
Currently a fresher to this software, I'm trying to refer this figure attached above for simulating and finding out State of Charge at the end of the cycle.
Can anyone guide me how to approach and build the system (marked red in figure) ?
I'm attaching the file to the post
Thanks in advance !

Answers (2)

Mike Sasena
Mike Sasena on 30 Jun 2020
Hi Rohan,
Probably the simplest method you could try would be to try "Coulomb counting". You use an integrator block on the incoming current signal to either increase or decrease the net charge in that subsystem. The SOC is then simply the current charge divided by the total max charge. It will be imperfect and drift over time, but it's a good first order approximation that you can implement with just a few blocks.
  3 Comments
Mike Sasena
Mike Sasena on 29 Nov 2022
Hi Mahendran,
Yes, that's definitely a more rigorous (and more applicable to the real world) method. There's an example in our documentation to show you how this can be done:
MAHENDRAN A
MAHENDRAN A on 5 Oct 2023
Thank you for the answer sir,
I've doubts on developing SOC estimation using coulomb counting method. Ive developed a basic logic model which im attaching for you're referrence. Can you explain me in detail about how to model an SOC estimation profile using coulomb counting for charging and discharging profile.

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Mike Sasena
Mike Sasena on 5 Oct 2023
Hi Manhendran,
There are several existing examples in both Powertrain Blockset and Simscape that may help you understand how to do SOC estimation, e.g.:
There are also detailed videos like this one on SOC Estimation.
Hope that helps,
Mike

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