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CVT

Printed From: Official Baja SAE Forums
Category: Competitions
Forum Name: SAE Sanctioned Competitions
Forum Description: All about Auburn, Maryland, and Oregon
URL: http://forums.bajasae.net/forum/forum_posts.asp?TID=2703
Printed Date: Jul/17/2019 at 4:23pm


Topic: CVT
Posted By: rd94
Subject: CVT
Date Posted: Mar/01/2018 at 10:14am
I am new to the competition and want to get more knowledge about cvt tuning.
I have gone through the aenn clutch handbook but I'm still not convinced on how to approach the tuning in real life.
Can anyone give some detailed steps/procedure to carry out tuning?



Replies:
Posted By: Andy.R
Date Posted: Mar/02/2018 at 2:08am
Simply put, start playing around with settings. You will learn much by changing weights, preload, helix angles, ramp angles, etc. Once you start changing variables, you can see what is affected by those changes. Get RPM data from both the primary and secondary to quantitatively tune, or even acceleration times & a cheap camera if you are on a limited budget. I'll give you a starting hint, primary weights are the first thing to tune and somewhat dial in. 

Best of luck!!Smile


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Andrew Raudabaugh
-Cyclone Off Road Racing 2013-18
-Aspiring Lottery Winner
-Just show up and do things


Posted By: Bantu
Date Posted: Mar/06/2018 at 10:38pm
Hellow people. I have a Design project whereby I gotta optimize a mini-baja CVT for better speed and hill climb. Any ideas as to where do I start doing this optimization?


Posted By: Andy.R
Date Posted: Mar/06/2018 at 11:18pm
Really ..... please read what I wrote in the last message. 

-------------
Andrew Raudabaugh
-Cyclone Off Road Racing 2013-18
-Aspiring Lottery Winner
-Just show up and do things


Posted By: rd94
Date Posted: Mar/12/2018 at 1:03am
Thanks buddy..
I have a much better idea now and have decided on using a simulation model using MATLAB to start things up.
Also I tried using hall and ir sensors for rpm measurement of the pulleys but they also give a considerable amount of error.
What technique did you use for rpm counting?



Posted By: Bantu
Date Posted: Mar/14/2018 at 1:44pm

My name is Bantu Keyizana residing in South Africa. I am a student at Nelson Mandela University (NMU) doing my BTech in Mechanical Engineering. In my Design Project, my lecturer asked me to optimise the CVT of the Mini Baja for better performance in acceleration event and hill climb event. I am not given any set of requirements/specification. Therefore I am expected to do my own research and make up my own requirements/specification. Please help me with the following questions with regards dynamic events of the mini Baja competition.

 

1. What was the least weight of the entire Mini Baja  in the previous mini Baja competition excluding the driver?

2. How long was the track for linear acceleration event?

3. What was the least time achieved by the Baja during the acceleration event on that specific track?

3. On Hill climb event, what was the steepest inclined? 

4. How long was the inclined track? 

5. What was the least time achieved by the Baja during the hill climb event on that specific track?

 

 

Regards

Bantu Keyizana

0739031847

 



Posted By: RLM
Date Posted: Mar/15/2018 at 7:07am
- please review past results for dynamic times. these results are available online with a little research.
- all baja vehicles weigh different amounts. anywhere in the range of 270# to 800#
- track data is not typically disclosed. I can tell you that the hill climb is steep and varies in length from event to event. 
- the accel run also varies but is typically between 100' and 150', though the surface it is performed on varies greatly. 



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McMaster Baja Racing (09-Dec 2015)
Team Captain 2012-2015
Suspension Lead 2015-2016
All spoonfeed PM requests will be billed at $10 USD per reply, payable via paypal.


Posted By: rd94
Date Posted: Mar/20/2018 at 11:36pm
Has anyone tried a simulation model for CVT Tuning?
How accurate has it been to the actual testing values?
what software did you try it on?



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