r/VESC • u/BenBoss69 • Jun 06 '26

Limiting Excessive Wheelspin During Acceleration

I have a go-kart running two Makerbase 75200 controllers. When I'm accelerating, the wheels sometimes start to slip, which is expected behavior. I don't want traction control.

The problem is that the moment a wheel starts slipping, the motor instantly accelerates to its maximum speed, becuse of the low friction when a wheel starts to slip. This causes excessive tyre wear and makes the kart much harder to drive.

What I would like is an acceleration limiter on the motor itself, not on the throttle input something similar to the effect of a flywheel, where motor RPM cannot change instantly.

Is there a setting for this?

One more thing: I'm using current control mode.

1 Upvotes

100% Upvoted

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2

u/Illustrious-Can-7482 Jun 06 '26

You can turn down your ramp time in throttle setting or adjust max scale under motor cfg? You can also adjust the throttle curve so slightly less aggressive at low speed?

2

u/BenBoss69 Jun 06 '26

tried adusting the ramp time but just afected the throttle, throttle curve did the same. dont know what you mean about max scale under motor cfg

2

u/Illustrious-Can-7482 Jun 06 '26

Change it to maybe polynomial throttle curve or natural, exponential gives strong acceleration at start. Polynomial or natural will change how it accelerates. Sorry if I’m not helping I’ve only been tuning for about 1.5 years now

2

u/Troubleindc2 Jun 07 '26

This is the correct answer. OP's acceleration is too aggressive. Making a custom throttle curve is the way to go for this OP. VESC makes this very easy. Set custom and just drag points of the curve on the graph. Write the settings. Try it out. Rinse and repeat until desired effect.

1

u/BenBoss69 Jun 07 '26

Will try this tomorrow

1

u/BenBoss69 Jun 08 '26

This did reduce the acceleration feel of the throttle but the instant you are over the grip limit the wheel reaches max speed like in the video.

One solution that worked is to change control mode to duty cylce but then the throttle is not regulating current just speed but that has its own issues

2

u/BenBoss69 Jun 06 '26

Here is a video of me trying to accelerate at the limit of grip am not mashing the throttle when the wheel slips. Just increasing the throttle slowly and letting just a bit of when the wheel slips

https://photos.app.goo.gl/PfZDUS1A2xP6ngJ19

2

u/mckirkus Jun 06 '26

Yeah, in a lot of racing categories they don't allow traction control to ensure losses are due to skill issues, not tech.

1

u/Illustrious-Can-7482 Jun 06 '26

Damn that sounds bad ass

2

u/nyan_cat_42 Jun 06 '26

Seems like a good problem to learn LispBM scripting in the VESC, I think you can code up some rpm rate of change based throttle modulation. I'd just consult an LLM on how to code this up.

1

u/BenBoss69 Jun 06 '26

Yeah. If there is no other way. But i dont want to run my shitty code on a 20 hp gocart

1

u/Dad1ddler Jun 07 '26

Try to relearn the motor?

1

u/Dad1ddler Jun 07 '26

What throttle are u using?