Pedal Assist Ratio
- Thread starter doctor_t
- Start date
StudEbiker
100 kW
It would be helpful to know more about your set up. What do you mean by pedal assist ratio? Where is it 1:1?
StudEbiker
100 kW
I reviewed your previous posts and found this: http://endless-sphere.com/forums/viewtopic.php?f=6&t=38993&p=569318#p569318
Is this the setup you are asking about?
I don't see a 1:1 ratio on the bike so I don't understand your question.
Nice looking bike though!
Is this the setup you are asking about?
I don't see a 1:1 ratio on the bike so I don't understand your question.
Nice looking bike though!
doctor_t
10 mW
- Joined
- Apr 20, 2012
- Messages
- 30
Thanx guys for your interest.
my question is about number of tunrs of pedals per minutes that are able to move the wheel
right now my pedal sensor is with a fixed ration, so if pedals are moving 60rpm i should have 60 rpm also at the whell
would like to know if it's possible to change this ratio so in case padals are moving 60 rpm wheel will move 80 or 100 rpm
don't know if i have to change something in connection of pedal sensor, put some resistance between pedal sensor and controller and so on
my question is about number of tunrs of pedals per minutes that are able to move the wheel
right now my pedal sensor is with a fixed ration, so if pedals are moving 60rpm i should have 60 rpm also at the whell
would like to know if it's possible to change this ratio so in case padals are moving 60 rpm wheel will move 80 or 100 rpm
don't know if i have to change something in connection of pedal sensor, put some resistance between pedal sensor and controller and so on
StudEbiker
100 kW
You have a pedal assist sensor (PAS) at the crank?
If so, then all that does is tell the controller that you are indeed pedaling and enables the motor to engage. Your throttle and how fast you pedal the cranks determines your wheel RPMs, not the PAS. Hope this helps.
If so, then all that does is tell the controller that you are indeed pedaling and enables the motor to engage. Your throttle and how fast you pedal the cranks determines your wheel RPMs, not the PAS. Hope this helps.
doctor_t
10 mW
- Joined
- Apr 20, 2012
- Messages
- 30
Thank you Stud, i will explain my situation
my controller has 2 connection for speed control 1st is for throttle and 2nd is for PAS
at 1st i put http://www.crystalyte-europe.com/product.php?productid=16171&cat=259&page=1 and it work but just little movement of pedals i have maximum power
at 2nd i put the one that goes with the kit and works well modulate the effort of the legs.
i would like to know how i can change the power at the wheel considering rpm of the cranck
thank you
my controller has 2 connection for speed control 1st is for throttle and 2nd is for PAS
at 1st i put http://www.crystalyte-europe.com/product.php?productid=16171&cat=259&page=1 and it work but just little movement of pedals i have maximum power
at 2nd i put the one that goes with the kit and works well modulate the effort of the legs.
i would like to know how i can change the power at the wheel considering rpm of the cranck
thank you
Here's my thoughts for what they're worth. You don't say what your knowledge is about these things, so in case you don't know much, I'll mention a couple of basics. Firstly, your motor has a max speed with the battery you have, so if it already reaches that speed, you won't be able to go much faster. Do you have a throttle fitted and does it go faster with it than with the PAS?If not then changing any ratios won't improve much. I've tried two types of PAS, which the manufacturers called 1:1 assist. The first type just gives maximum power (or a fixed high level of power) as soon as you pedal. The second type gives a motor speed which depends on pedal speed. There's also ones with a panel, where you can set the amount of assist/speed, but I don't see a panel on your bike so lets forget about them. As far as I know, the relationship between motor and PAS is set by software in the controller, which can't normally be changed unless you have a programmable controller.
One of my bikes has a PAS which gives a proportional relationship between pedal speed and motor speed. It worked quite well when it was low powered. Then I set about increasing the power and speed, so I put a higher voltage battery and soldered the shunt in the controller for more amps. Afterwards, it worked great with the throttle, but was totally useless with the PAS. When I started pedalling, the PAS would start adding power so that I accellerated and pedalled faster, which caused the controller to rapidly increase the power until I couldn't pedal fast enough, so I changed gear, which dropped the pedal speed and the power, so now I didn't have enough power to maintain the speed. I spent all my time pedalling too slow or too fast with lots of gear-changing and I couldn't maintain a constant speed.
I can't see how this variable power PAS can work unless the algorythm is set exactly to match your motor power and speed and the way you want to pedal. Is that what you're trying to achieve, or do you you just want to go faster?
One of my bikes has a PAS which gives a proportional relationship between pedal speed and motor speed. It worked quite well when it was low powered. Then I set about increasing the power and speed, so I put a higher voltage battery and soldered the shunt in the controller for more amps. Afterwards, it worked great with the throttle, but was totally useless with the PAS. When I started pedalling, the PAS would start adding power so that I accellerated and pedalled faster, which caused the controller to rapidly increase the power until I couldn't pedal fast enough, so I changed gear, which dropped the pedal speed and the power, so now I didn't have enough power to maintain the speed. I spent all my time pedalling too slow or too fast with lots of gear-changing and I couldn't maintain a constant speed.
I can't see how this variable power PAS can work unless the algorythm is set exactly to match your motor power and speed and the way you want to pedal. Is that what you're trying to achieve, or do you you just want to go faster?
If it uses a number of magnets in a ring around the crankshaft, then simply change the number of magnets and it should change the ratio, because it is probably counting the number of detections to determine the "speed" at which you are pedalling.
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