Difference between pages "Pedal Assist (PAS) or torque sensor" and "DIY-battery"

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(Created page with "Which type of pedal assistance should you implement? If you want to ride your e-bike like a bicycle, pedaling but with help, torque sensing is vastly superior. Simple cadence-sensing PAS, as on the BBSHD, simply detects whether or not the pedals are moving, and applies a set amount of power based on which PAS level you've set it to. It's like a cruise control, but in predefined steps, and that only works when you're pedaling or pretending to pedal. Torque-sensing PAS d...")
 
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Which type of pedal assistance should you implement?
'''Intent:''' This page is created as a guideline whether if assembling/designing your own battery pack is a viable option compared to buying a pre-made battery.
Prerequisite software/knowledge (before building a pack)


If you want to ride your e-bike like a bicycle, pedaling but with help, torque sensing is vastly superior.
Ability to draw 2D schematics/diagrams. - you need to do this if you are trying to make a pack with a certain dimension constraint. use of CAD is encouraged.
Simple cadence-sensing PAS, as on the BBSHD, simply detects whether or not the pedals are moving, and applies a set amount of power based on which PAS level you've set it to. It's like a cruise control, but in predefined steps, and that only works when you're pedaling or pretending to pedal.


Torque-sensing PAS detects not only whether or not you're pedaling, but also how much effort you're putting in, and it applies power proportional to how much effort you're putting in.
You know how to use the [https://ebikewiki.com/index.php/Simulator|Grin simulator] - You need to know how much current your battery will be drawing.


If you enjoy pedaling and/or saving battery then you may be interested in some assistance.
Ohm's law. Since we are not going into AC power, complex number/angle is not needed.  
In certain locations pedal assistance is also the law.
The two most common types are a magnetic cadence PAS sensor and a bottom bracket torque sensor.


==Cadence / Magnetic Ring Pedal Assist System (PAS)==
Ability to read battery cell datasheet. - As the wiki page becomes older, more cell info will be added to the page; but for cells that are not on this wiki/internet in a simplified format, reading datasheet will be necessary. [https://www.batteryspace.com/prod-specs/11514.pdf LG M50LT datasheet, from batteryspace], [https://www.batemo.de/products/batemo-cell-library/lg-energy-solution-inr21700-m50lt/ Simplified datasheet of M50LT, courtesy of Batemo.de]
pros:
*Inexpensive
*Generally included with hub motor kits
cons:
*Limited by the controllers algorithm, whether that be good or bad is left up to your controllers software
*Measures crank movement instead of force, therefore not as accurate or efficient
 
==Torque sensors (bottom bracket type)==
pros:
*More accuracy and efficiency
*Measures the force you apply to it and can distribute proportional force (or more, depending on your software)
*More flexibility, feels more like a bike than a typical PAS system.
cons:
*More expensive
*Requires drilling a hole in the bottom bracket shell for the wire

Revision as of 08:31, 13 September 2023

Intent: This page is created as a guideline whether if assembling/designing your own battery pack is a viable option compared to buying a pre-made battery. Prerequisite software/knowledge (before building a pack)

Ability to draw 2D schematics/diagrams. - you need to do this if you are trying to make a pack with a certain dimension constraint. use of CAD is encouraged.

You know how to use the simulator - You need to know how much current your battery will be drawing.

Ohm's law. Since we are not going into AC power, complex number/angle is not needed.

Ability to read battery cell datasheet. - As the wiki page becomes older, more cell info will be added to the page; but for cells that are not on this wiki/internet in a simplified format, reading datasheet will be necessary. LG M50LT datasheet, from batteryspace, Simplified datasheet of M50LT, courtesy of Batemo.de