Drivo Erg Mode

Drivo, Rampa, RealTour, RealAxiom, RealPower, Real Turbo Muin, Qubo Digital Smart B+

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Steve Rode
Posts: 7
Joined: Thu Mar 16, 2017 10:38 pm

Re: Drivo Erg Mode

Postby Steve Rode » Wed Apr 19, 2017 10:32 am

Thank you, I received the email

eraleous.constantinos
Posts: 1
Joined: Thu Apr 27, 2017 10:08 pm

Re: Drivo Erg Mode

Postby eraleous.constantinos » Thu Apr 27, 2017 10:15 pm

I have the same problem, and I have to say that after spending and investing that money on this trainer I am very disappointed. It is very frustrating to see the power going up and down and varying 10-20 watts from our power meter!
How are we going to train and simulating trainings and races?

After all, that's the reason for buying a high tech trainer right?

User avatar
Elite Admin S
Posts: 260
Joined: Tue Nov 08, 2016 10:18 am

Re: Drivo Erg Mode

Postby Elite Admin S » Fri Apr 28, 2017 12:17 pm

I’m sorry for your disappointment.

Please notice that 10-20W variations are absolutely normal. As we said before, they are not due to the trainer but they depends on the normal differences between the pedal strokes. To demonstrate this, we have done a test with the brake blocked and we’ve registered the same variations.

Image

We’ve also done some comparative test using other competitor’s trainers and measuring the power using an ergometer. All of them show the same behavior, as you can see in the links below:

Kickr: https://drive.google.com/open?id=0By4rZ ... GcxX3duMWc
Neo: https://drive.google.com/open?id=0By4rZ ... DVVcUtfY3M
Hammer: https://drive.google.com/open?id=0By4rZ ... DVVcUtfY3M

dghcal
Posts: 1
Joined: Thu Aug 17, 2017 2:21 am

Re: Drivo Erg Mode

Postby dghcal » Thu Aug 17, 2017 2:25 am

Funny, I have the opposite problem. I can be riding along (ZWIFT) between intervals at say 200W before the trainer comes to a grinding halt - I switch to the lowest gear and the crank barely turns with all my force. ERG mode disengages itself, and after a few seconds I can slowly get the crank to turn again, eventually freely. ERG re-engages and we continue, now having failed the FTP test interval After a few minutes it locks again. I have stopped using ERG mode. Please advise, stopped using ZWIFT ERG mode

djwalker1260
Posts: 1
Joined: Wed Aug 23, 2017 7:09 am

Re: Drivo Erg Mode

Postby djwalker1260 » Wed Aug 23, 2017 7:29 am

To me this sounds like an underdamped servo system with too high of a gain- the trainer measures a power that is, for example, too high and then lowers the resistance. However, it lowers the resistance too much and now the power is too low. So it increases the resistance. Again by too much. And the power is too high again. Repeat this forever = sine wave appearance of power output. This could probably be fixed fairly easily by characterizing and re-tuning the servo loop. To me the erg mode servo feels quite "loose". I can pedal a fair bit above or below the target power and it takes quite a while to respond by changing the resistance. This is great in Zwift because you don't get unrealistically sharp changes in resistance. in erg mode you want it to be a bit more aggressive.

jmess
Posts: 3
Joined: Fri Mar 10, 2017 4:42 am

Re: Drivo Erg Mode

Postby jmess » Mon Sep 11, 2017 1:30 am

All of the Zwift training session I have done always have a watt target for the interval and the recovery. So if you slow your cadence and drop below the current Zwift Watt target enough Ergo mode will increase the resistance to the target watts at your new cadence within 3-4 seconds. So changing to a lower gear doesn't do anything for you. The problem seems to be once the resistance starts increasing for the new lower cadence, going from 90 RPMs to 70 for example, it ramps up too fast. If you react to the ramp up by slowing your cadence even more then you feel like you hit a wall because the resistance continues to increase/adjust to your cadence change. If you try and increase your cadence it can take 3+ seconds for the Drivo to start adjust to your increase in cadence. This delay/bug? can bog you down and if you are tired and/or less fit force you to stop pedaling until Ergo releases.

I run into this a lot when I try and get out of the saddle during a training session to stretch my legs or put out more power, my cadence tends to drop off 15-20 RPMs and resistance at my new lower cadence increases to match the watt target. When I sit back down and try and increase cadence I can get overwhelmed sometimes by the amount of time it takes before the resistance starts to adjust to my increasing cadence. As a mere mortal I sometimes have to stop pedaling and wait for Ergo mode to release. This whole sequence is unnatural and not something you experience in the real world.

dghcal wrote:Funny, I have the opposite problem. I can be riding along (ZWIFT) between intervals at say 200W before the trainer comes to a grinding halt - I switch to the lowest gear and the crank barely turns with all my force. ERG mode disengages itself, and after a few seconds I can slowly get the crank to turn again, eventually freely. ERG re-engages and we continue, now having failed the FTP test interval After a few minutes it locks again. I have stopped using ERG mode. Please advise, stopped using ZWIFT ERG mode


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