How is tractive force calculated from the PID controller of the Glider Model?

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Mathew Lindley 2017-10-16

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评论： DEEPA ANAND 2019-3-27

Hi there,

I am looking at using the model provided in Vehicle Modelling Part 1 in order to model the energy consumption and state of charge of a battery during the endurance event. I am wondering how the tractive force parameter is calculated from the PID controller?

I am also wondering how I am able to input my own parameters for my vehicle for the calculation of aero drag, rolling resistance etc.? When I double click the block I see there is an equation typed in but I am unable to locate where the parameters are within the MATLAB workspace.

Many thanks, Matt

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kartik kanchan 2018-1-11

Please tell me gain is selected on what bases and how to input values in DrCycles.US06 and what values

DEEPA ANAND 2019-3-27

Can you please tell me how the PID tuning is done for both driver glider and BEV system.

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Answer 1

Christoph Hahn 2017-10-16

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编辑：Christoph Hahn 2017-10-16

Hi Matt,

the model is a closed-loop control system. The PID block gets the difference between desired speed (from drive cycle) and actual vehicle speed as input. It then increases or decreases the tractive force so that the difference is minimized. It is not solving an equation. Does that explanation make sense?

Cheers Christoph

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Mathew Lindley 2017-10-16

Hi Christoph,

Thank you for the reply. I understand that the PID block is calculating the error between vehicle speed and drive cycle speed, however I am unable to understand how this result models the tractive force. My understanding is that the difference between two speeds would result in another speed.

Apologies if I am missing something obvious however vehicle modelling is very new to me.

Thanks for your patience,

Matt

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Answer 2

Christoph Hahn 2017-10-16

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Consider the tractive force to be an input to the vehicle model, so that the car reaches a desired speed.

For example, this is similar to your foot hitting the accelerator / brake pedals on a speed limited road that has hills.

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Mathew Lindley 2017-10-16

Okay I believe I am closer to understanding the model.

So to recap, let’s imagjne that I provide drive cycle data involving speed and time, the tractive force can be determined from the error between the vehicle speed and drive cycle required speed?

Thanks

Matt

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