The purpose of the parameter Power smoothing in MyETraining app and Drivo

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michaelwestergaard
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Joined: Tue Sep 18, 2018 3:17 pm

The purpose of the parameter Power smoothing in MyETraining app and Drivo

Postby michaelwestergaard » Sat Nov 17, 2018 12:02 am

Please can lease you explain the purpose of the parameter Power smoothing in the advanced configuration of the MyETrainings app?

What values are valid to enter for this parameter and how should different values change the way the Drivo hometrainer behaves or feel like?

The reason I ask is that I suspect that my Drivo stops very quickly if no force is applied whereas the "road feel" becomes more natural at speed.

So far I have the feeling that I have to work much harder both when going uphill or downhill when using the Drivo than what i do on the road. I have used the calibration feature on the app., but it does not change anything.

I have also tried to attached a Quarq powermeter to the bike one time and can also put a Stages powermeter on the left arm at the same time if I want to. The power values I get from these devices are not way off either with respect to each other or with respect to the power values I get from the Drivo itself so that seems to be ok. At least not to a degree so I feel there is anything wrong.

For instance:

If I compare a nice steady climb I did on Teneriffe some years ago for real I have the following real values: Dist.=6,8 km, time: 36:10, avg. speed approx. 11,3 km/h with Pavg =227 W and NP= 231W

If I do the same climb from a MyRealvideo I have obtained the following data from the Drivo / MyETraining app. Dist=6,83 km, time: 36:39, avg. speed approx 11,2 km/h with Pavg =219W and NP=222W.

The climb has slopes around 6-9% most of the time and does not change too much all the way. In fact some Pro Tour teams use the real climb for test purposes.

As the MyRealvideo does not start at exactly the same point where I meassured the climbing part of my real ride there could be a good reason why there is this difference between the real and simulated data. Another fact is that my real data was obtained with an SRM powermeter I had at that time, hence the powerdata from the SRM are not obtained from the rear wheel and would be expected higher than my Drivo data due to loss in the chain / cassette system.

But the feeling I have is that when riding uphill using the Drivo is that It becomes rather hard and unnatural to maintain a steady low pace compared to the real world. If I speed up to a higher pace the feeling becomes more natural.

For instance if I want to climb this course I wrote about with 10-11 km/h I only have to slow down a little bit before it is very hard to get up in speed.  And with slopes in the +12% region it quickly becomes unnatrual and nothing that feels like the real world.

It is as if the cadence / speed gets low it almost feels like a standing start on a track bike doing a 4k pursuit or something like that.

The same "quickly brake / stop" feeling occur if I ride a course going downhill. If that is the case it is all most impossible to obtain speeds above 40km/h even if the gradient or slope is - 5 to - 6%. And anybody who have tried to ride down a real -5 % slope knows that you easily get above 50 km/h without doing much work.

Hence I wonder if this behaviour relates to the Power smoothing parameter.

Best regards /

Michael

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