Gear ratio as output from CVT block

Is there a way by which I can take instantaneous gear ratio as output from CVT block available in the powertrain blockset ?

[Dung Nguyen Huu]

Sir did you make a CVT model in simulink ? Can i ask you about this problem?

Answer 1

[Hiroshi Miyagawa]

yes. please see the following.

[Aditya Gandhi]

Thanks ! For the PllyRatioReq tab, do i need to input a look up table of RPM vs reduction ? If yes, is there any standard look up tables available or how do I build them ? Attaching the model for your reference. I am working first time on the powertrain blockset, please can you advise if the connections are correct.

[Hiroshi Miyagawa]

why dont you use a reference application. Powertrain Blockset includes some example models that is built using Powertrain Blockset library blocks.

e.g. Conventional Vehicle Spark-Ignition Engine Fuel Economy and Emissions

unforutunatly, this example doesnt include the CVT block, but you can edit the model.

hope it helps you.

[Hiroshi Miyagawa]

the attached zip file is based on Conv Veh Ref Application, using CVT and Trq Conv blocks. MATLAB version R2019b.

You can refer to this model.

[Aditya Gandhi]

i did not understand what is PllyRatioReq input. is it the gear reduction required ? For example if i want constant reduction of 3, should i give constant input 3 to PllyRatioReq ?

[Hiroshi Miyagawa]

Yes, you are right.

[Aditya Gandhi]

Please can you suggest a way by which I can build a torque coupler (which combines torque from engine and motor using k1, k2 values) in powertrain blockset. Is there a standard block available ?

Please refer to attached image.

[Hiroshi Miyagawa]

I assumed that you don't make sense how to connect between a "mapped motor" block and gear train.

If you select 'Speed' at Port configuration, it might make you sense.

and, other reference application of Powertrain Blockset, e.g. this, might help you.

[Aditya Gandhi]

Thank You. Do i need to put a dc-dc converter between the battery and motor ?