Energy use figure and Output Check Plots

[Deepak Prakash]

Sir, is it possible to generate the energy use figure and output check plots from the command window after I run the vehicle through a drive cycle with adv_no_gui? Also could you please tell me which file I should look into for the plots which are generated when I click the Energy Use Figure or the Output Check Plots?

Thanking You.

Regards,

Deepak Prakash K.

[Michael P O'Keefe]

I don't believe there is anything set up to generate the plots from the command line but you can possibly do it yourself by calling the right routines (or at lease you can get the data to make your own figures/files to save). The file you need to see is gui/gui_post_process.m

- Michael

[Deepak Prakash]

Sure sir. Thank you. With regard to the energy use figure, I am not able to understand a couple of things.

• For the default ev model (whose energy use figure I've attached below), during the regen mode, why is the wheel out energy not matching the in to the final drive? Also can the energy given under braking taken as only due to the friction brakes?
• During regen mode, for aerodynamic and rolling resistance, no values have been displayed. Has it been incorporated in the power mode itself or has it been neglected for the regen mode?

[Michael P O'Keefe]

Replies inline below:

On Wednesday, June 27, 2018 at 1:23:05 AM UTC-6, Deepak Prakash wrote:

• For the default ev model (whose energy use figure I've attached below), during the regen mode, why is the wheel out energy not matching the in to the final drive? Also can the energy given under braking taken as only due to the friction brakes?

Final drive output should equal wheel/axle input. In power mode, input is taken as the "engine side" and output is the "wheel side". Yes, braking energy is that dissipated from friction brakes.

• During regen mode, for aerodynamic and rolling resistance, no values have been displayed. Has it been incorporated in the power mode itself or has it been neglected for the regen mode?

The aerodynamic and rolling resistance load is accounted for during the power mode. 

[Deepak Prakash]

Thank you for your reply sir. Please correct me if I'm wrong but during regen mode, doesn't it work in reverse? (i.e) doesn't the power/energy flow go from the wheels to final drive to gearbox to motor and finally to battery? If that is right, output from wheel should be taken as input to the final drive.

[Michael P O'Keefe]

For regen mode, you have 1,697 kJ output from wheel/axle - 770 kJ brake which is approximately equal to 926 kJ for final drive input (minus some rounding error)

[Deepak Prakash]

Thank you for the reply sir. I have attached below the energy figure for an ev for which I had modified values from the default files for the components. Here there is a loss component for the wheels during regen mode which is not present in the default model for ev. What could this be due to sir? The loss is also present when I use the default component file for wheels.

[Michael P O'Keefe]

Also the negative value of loss for wheels during power mode looks suspicious.

What are the exact changes that were made? I think you'd have to start with the default EV that was working and add your changes in one by one and continue to check the energy use figure to see what's going on and when things start to become strange. I'm not sure what's going on with only this information. If you can isolate the issue and it doesn't make sense, then you can let us know your findings and we might be able to help you further.

Michael

[Deepak Prakash]

Sir thank you for your reply. As you had suggested I tried adding one change at a time. Interestingly what I found out is for the default ev vehicle model itself, when I change from front wheel drive to rear wheel drive (in the GUI options are given), the energy use figure shows infinite efficiency for the wheels during the power mode. I've attached figures for both the front wheel and the rear wheel drive. Also one more observation was when I changed from lead to li battery for the same default ev model, the loss in regen mode for the wheels has a negative value which doesn't make sense. I've attached the snap for that as well. Could you please look into these issues?

[Michael P O'Keefe]

Good work!

I think you have found a bug with the front wheel drive / rear wheel drive. I've added a support ticket:

https://sourceforge.net/p/adv-vehicle-sim/tickets/41/

I also agree with you that there seems to be something strange with the negative energy flow when switching from lead acid to lithium ion battery. I've created another ticket for that here:

https://sourceforge.net/p/adv-vehicle-sim/tickets/42/

Your explanations will be very helpful in fixing the problems. Thank you.

That said, please note that ADVISOR is a volunteer effort for me and I don't have much time for it any more. I spend most of the time I have for ADVISOR on this list answering user questions. I'll get to the fixes when I can but I can't promise anything in terms of timing. If you care to look into it more yourself, let us know.

Sincerely,

Michael

[Deepak Prakash]

Thank you sir. I'll try to figure out a way to work around this. For front wheel/rear wheel drive I think I can manage, but not sure what the problem could be for the batteries. Anyway after you fix the bugs, will we be informed as to what changes we need to make? Or should we reinstall the software? 

[Michael P O'Keefe]

Yes, you should be able to just choose the front wheel drive option for now (rear vs front wheel drive makes little difference to the energy estimation). For the batteries, that is a bit harder. Definitely proceed with caution.

I cannot promise when I will be able to fix these bugs but if I find a fix, I will close the associated tickets and will push my changes into source control on SourceForge. If you watch the project for updates, you will see it then. Once changes are made, you would have to either manually pull down those changes or reinstall ADVISOR.

However, please note that I don't know when I will be able to get to this. If you are doing engineering or other research with ADVISOR, I would urge you to also look into it further on your side or take caution with the results.

Thank you,

Michael

[Kundan Yadav]

Hi Deepak Prakash,

I am the beginner with the ADVISOR. Can you please help me with my EV vehicle? 

Best Regards

Kundan

[Kundan Yadav]

Dear sir 

I am getting the following error.