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01893494

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01-30-2010 11:20 AM

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Hello everyone. I am a year 3 student of EE and i am doing a final year project about state of charge of lithium ion battery.

Now i want to know the capacity of battery discharged so i develop a program and a current adjust button to adjust the dischrage current.

But here is a problem. I dont know how to find the area of the graph under the dischage current against time.

Can anyone help me plz ??

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altenbach

Knight of NI

01-30-2010 11:41 AM

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You would just integrate your data, there's a VI for that. 🙂

What is the datatype of your curve (array, waveform, dynamic, etc.)?

Can you attach a simplified version of your actual VI and some data?

01-30-2010 12:07 PM

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actually i use GPIB card to link the load and the computer together, so i cant give a simplified verison for u.

But the full version is still easy to read .

I use a bundle to combine the the two readings together.

GerdW

Knight of NI

01-30-2010 12:27 PM

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Hi,

as the plots looks like a bar plot you may simply use the formula "sum(I*dt)" (which is a simplified form of integration).

But as a "year 3 student of EE" you should have heard that before

Best regards,

GerdW

using LV2011SP1 + LV2017 (+LV2020 sometimes) on Win10+cRIO

GerdW

using LV2011SP1 + LV2017 (+LV2020 sometimes) on Win10+cRIO

01-30-2010 11:31 PM

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livefortune

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02-03-2010 03:58 AM

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Hi there,

You can split the data into several parts, and bundle the data to waveform datatype and use integral vis in LV to fulfill the job.

NISH AE

Fortune