Sul sito americano<
www.electricbikereview.com> esiste una Interessante e dettagliata discussione relativa alla determinazione del settaggio dei livelli di assistenza Ebikemotion in funzione delle caratteristiche specifiche del rider. Vi riporto un estratto nel caso qualcuno fosse Interessato a seguirlo. Io sono registrato e seguo di tanto in tanto, specialmente quando utilizzavo la Cannondale Topstone Neo Lefty3, bisogna però avere ben presente le differenze sostanziali fra EU e USA per quanto concerne sia la classificazione motori ,sia l'abissale differenza nelle condizioni di utilizzo specificatamente nel settore gravel ...
QUOTE:
After a pause to discuss other interesting topics about the operation of the X35 system, I allow myself to return to the development about my proposal for the objective estimation of assistance levels based on the cyclist's Power Profile.
As a summary:
1) Each cyclist has a mass (Kg) and has an
FTP , that is, a sustained power delivery capacity (W).
2) The W/Kg ratio is known as the Cyclist Power Profile. A power profile of approximately 3 will be considered good for touring cycling.
3) Using an EBike adds mass that you don't have on a conventional road bike. In the case of systems based on Mahle X35 and aluminum bicycle frame, this additional mass is around 7Kg.
The methodology proposed here for estimating assistance levels is based on:
A) match the rider + the additional mass of 7Kg to a Power Profile of 3.
B) We will call this new power
"Equalized Power"
C) We will call "
Delta W" the difference
(Equalized Power - FTP) and it will be a power that must be permanently supplied by the battery at each level of assistance. We can also understand it as the minimum lack of power and it must always be supplied by the battery.
D) We will estimate the power assistance levels based on ranges of % slopes that we can find on the route.
Level L0 (no assistance) when the slope of the route is in the negative range or from 0% to 4%.
Level L1 when the slope of the route is in the range of 4% to 7%.
L1=“Delta W” + (Equalized Power)x25%
Level L2 when the slope of the route is in the range of 8% to 11%.
L2=“Delta W” +(Equalized Power)x45%
Level L3 when the slope of the route is in the range of 12% and above.
L3=“Delta W”+ (Equalized Power)x70%
As an example we will use information provided by
r1roman:
Mass= 72Kg
Height= 173cm
Experience = 40 years practicing cycling
Age= 67 years
FTP = unknown
Diseases = None
Considering that his background and that his Muscle Mass Index is at a normal value (
we are going to dare to say that he is in good shape). A middle-aged cyclist with similar data, his FTP can be around 250 W. For the approximate case of r1roman we are going to estimate his FTP at 210 W. Then:
Power Profile= 210W/72Kg =2.92
For the calculation of the Equalized Power we take into account the mass of r1roman + 7kg of extra mass for the Ebike
Equalized Power= (72+7) x3= 237 W
DeltaW = (237-210)= 27W
With this we conclude in the following assistance level:
L1= 27+237x25%= 86 W , Mapping L1 in Mahle app will be = 86%
L2= 27+237x45%= 133 W , Mapping L2 in Mahle app will be = 76%
L3= 27+237x70%= 193 W , Mapping L3 in Mahle app will be = 77%
As I have said on several occasions, the purpose of this methodology is to have a starting point in the customization of our assistance levels, with the purpose of optimizing the energy available in the battery. On the other hand, with this optimization we will able to plan longer or more demanding routes.
From these input values, we can make fine adjustments based on the sensations we experience on the route. Finally we can achieve our well-tuned customization.
UNQUOTE
