[REQ] auto speed adjustment based on incline

[kazuyoshifunaki]

I am using QZ for running on a treadmill with Zwift open. Auto incline now works, and it is a game changer. Fantastic!

I am also running with a Stryd power meter, and watt is my main training KPI. Would it be possible in addition to the auto incline to have an auto speed adjustment that aims at keeping my weight constant?

I love the changing inclination and it makes running on a treadmill so much more engaging. However, I now find myself adjusting with the speed all the time because I’d like to wattage flat.

I assume given I already have the watt adjustment based on speed and changing inclination, the same formula can be used to calculate the speed that would keep the wattage constant?

I found a setting to adjust speed based on inclination, but it is for treadmills that don’t have an inclination setting. Maybe that could be a workaround.

Apologies if someone has discussed this already, but I couldn’t find this exact feature.

[cagnulein]

You can do this already enabling the pid on heart tile With this tile Qz is keeping you on a certain heart rate zone so when the inclination changes, qz changes the speed accordingly, based on wattage, to keep you in the right zone Let me know! Roberto Viola Software engineer and open source enthusiast http://robertoviola.cloud Il giorno sab 11 gen 2025 alle 10:07 kazuyoshifunaki < ***@***.***> ha scritto:

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[kazuyoshifunaki]

I will try this out. It does not sound like what I would want but I will try it and feedback here. :-)
Thanks

[cagnulein]

I mean, if it works OK, I can expand this even without the PID hr, what I suggest it's just a way to test it right away without modifying the code and so you are good to test right now :)

[kazuyoshifunaki]

I will try! :-)

[kazuyoshifunaki]

I tried it and I am not sure what I saw:

1. The number I can adjust in the PID heart rate tile is the Zone I would like to train in?
2. When inclination doesn't change, no adjustments are made to the speed. E.g. my heart rate goes up, even beyond the zone I had set in the tile.
3. Once inclination changed, the adjustment to the speed was exaggerated (it almost stopped the treadmill). Did this happen, because my heart rate was above the zone that I had set in the PID tile?

Note that I do not train with heart rate usually, so this is probably not what I want. (heart rate drift would break my training approach :-))

The way I thought it could work for me is:

• I run at a certain speed and inclination. My Stryd gives me the power number.
• When I feel I am in the right zone, I hit a button to "tell" QZ that this is the Watt I would like to keep
• QZ auto-adjusts speed to stay within +/-5% of the watt (based on changing incline that Zwift mandates)
• any manual speed change will then pop out of this mode

Let me know if I am misunderstanding the heart rate PID tile, and what you think of the auto-speed adjustment suggestion?

[cagnulein]

You understanding it right but something is not OK in the setup if you are not seeing moving :) First question : are you able to change the speed from qz using the speed tile? I'm going to bed now, I will be back in 8 hours Roberto Viola Software engineer and open source enthusiast http://robertoviola.cloud Il giorno dom 12 gen 2025 alle 22:21 kazuyoshifunaki < ***@***.***> ha scritto:

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I tried it and I am not sure what I saw: 1. The number I can adjust in the PID heart rate tile is the Zone I would like to train in? 2. When inclination doesn't change, no adjustments are made to the speed. E.g. my heart rate goes up, even beyond the zone I had set in the tile. 3. Once inclination changed, the adjustment to the speed was exaggerated (it almost stopped the treadmill). Did this happen, because my heart rate was above the zone that I had set in the PID tile? Note that I do not train with heart rate usually, so this is probably not what I want. (heart rate drift would break my training approach :-)) The way I thought it could work for me is: - I run at a certain speed and inclination. My Stryd gives me the power number. - When I feel I am in the right zone, I hit a button to "tell" QZ that this is the Watt I would like to keep - QZ auto-adjusts speed to stay within +/-5% of the watt (based on changing incline that Zwift mandates) - any manual speed change will then pop out of this mode Let me know if I am misunderstanding the heart rate PID tile, and what you think of the auto-speed adjustment suggestion? — Reply to this email directly, view it on GitHub <#3030 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAALYWECZ5IO2DQ46TRPZVL2KLMGHAVCNFSM6AAAAABU7ZA2M6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDKOBVHEZDAOBWGA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[kazuyoshifunaki]

Thanks and no worries regarding sleep. We all need it :-).

To answer your question, I actually re-opened a bug to capture some of the strange behaviour I am seeing.
I indeed created some speed presets and the behaviour is strange. In all cases, it reduced the speed to walking speed. If this is also related to the PID tile, I will probably need to test it tomorrow without it to rule that out.