CVT |
Post Reply |
Author | |
rd94
Double Secret Probation Joined: Mar/01/2018 Location: India Status: Offline Points: 9 |
Post Options
Thanks(0)
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?
|
|
Andy.R
Welding Master Joined: Dec/02/2014 Location: Ames, IA Status: Offline Points: 150 |
Post Options
Thanks(0)
|
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!!
|
|
Andrew Raudabaugh
-Cyclone Off Road Racing 2013-18 -Aspiring Lottery Winner -Just show up and do things |
|
Bantu
Bolt Sorter Joined: Mar/06/2018 Location: Port Elizabeth Status: Offline Points: 30 |
Post Options
Thanks(0)
|
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?
|
|
Andy.R
Welding Master Joined: Dec/02/2014 Location: Ames, IA Status: Offline Points: 150 |
Post Options
Thanks(0)
|
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 |
|
rd94
Double Secret Probation Joined: Mar/01/2018 Location: India Status: Offline Points: 9 |
Post Options
Thanks(0)
|
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? |
|
Bantu
Bolt Sorter Joined: Mar/06/2018 Location: Port Elizabeth Status: Offline Points: 30 |
Post Options
Thanks(0)
|
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
|
|
RLM
Baja Godfather Joined: Nov/15/2012 Location: Hamilton, ON Status: Offline Points: 1258 |
Post Options
Thanks(0)
|
- 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.
|
|
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. |
|
rd94
Double Secret Probation Joined: Mar/01/2018 Location: India Status: Offline Points: 9 |
Post Options
Thanks(0)
|
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?
|
|
brianballewsr20
Double Secret Probation Joined: Dec/10/2019 Status: Offline Points: 2 |
Post Options
Thanks(0)
|
I built a very complex model in matlab as part of my thesis in 2016. I had no experimental data to valid the model though. Took several minutes to run a 10sec simulation, even when using the MXfunctions to convert to C code. Many of the problems are based on measuring/defining model perimeters and boundary conditions.
https://scholarworks.uark.edu/etd/1375/ |
|
Iron Man
Double Secret Probation Joined: Feb/24/2020 Location: Canada Status: Offline Points: 5 |
Post Options
Thanks(0)
|
Matlab is essentially useless for theoretically calculating optimal tunes, believe me I've tried and failed. Get a tiny tach and watch it as you accelerate. Change the ramp angles, weights and springs in the primary to keep your rpm as high as possible without hitting the rev limiter. More spring force=more rpm, less weight=more rpm, steeper angles=more rpm.
|
|
Post Reply | |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |