Variable regen, torque sensor, display

leo3387

1 mW
Joined
Feb 14, 2025
Messages
16
Location
Bordeaux
Hello guys,

I do bike deliveries in France, currently using an ebike conversion kit 48v 1000w with a basic chinese controller, SW900 display and pedal sensor (see photo attached). I had regen at the beginning, in 2018, but eventually the hydraulic E-brake levers leaked and I had to throw them away, just using normal brakes since. I am not a very technical guy and didn't know about the magnetic brake sensors at the time. Anyway, now I have one of the magnetic sensor but regen doesn't work (probably a controller problem as the sensor does cut off the motor when activated, but regen doesn't engage).

The point is that now I want to upgrade my whole experience of bike delivery. I already bought a new muscular bike in that context, a Cannondale adventure 1 with a low step-through frame for easy stepping in and out (I need to do it dozens of times per day), and what I need now is to find the electric components to electrify that bike. I have a few specific things I want, and I need help from people who know this stuff. Here are my criteria:

- Variable regen either through brake levers (the more you press the lever the more regen you get) or a thumb throttle (the more I press, the more regen I get)

- A torque sensor and a PAS: I should be able to switch between both while riding the bike. I'm ok using an app on my phone connected via bluetooth to the controller to do that, but maybe an actual physical switch would be nice. Both sensors need to have various levels of speed/power settings (like the 3/5/9 PAS level) that can be changed easily with buttons while riding.

- A display with the time on it, the battery voltage, the watts being used

- A USB port to charge my phone

- A full throttle to accelerate, in addition to the thumb throttle that could be used for variable regen only.

- In case of police controls, the ability to set a mode within seconds (pressing a button, or two, or something else) that has all legal limits of 25km/h, 250W, and 6km/h for the throttle in it. Because I cannot afford getting the bike taken and destroyed, I know they would do it easily if the speed is above 25km/h and watts above 250. I anyway usually ride slow, maximum 30km/h, but I want to be able to go up to 40km/h when there are long roads to drive. So, maybe a mode for torque sensor, a mode for PAS, and a mode for speed/watts limits.

- A sinewave controller for optimal smooth acceleration curves and silence of motor.
My current controller gives a bit of jerky accelerations and I don't like it, I usually compensate with the thumb throttle but my thumb gets tired. As I stop and accelerate hundreds of times per day with deliveries, I need the accelerations to be as smooth as possible.
I feel that a bluetooth controller that is programmable either on phone or computer would be great.

- An easy waterproof motor-to-controller plug. My current connection is a painful terminal strip (3 motor wires) and a jst plug (hall sensors) (see photo attached). In case I need to change a tire, this is awful.
Also, any idea how to protect all those controller's wires from the rain? As I ride often in the rain for hours

- A 750w-1500w motor

- Not too expensive. I know Grin technologies does fulfill most of my criteria, except their price tag which is way too much. Also the cycle analyst looks very unappealing in its usage. Plus, I'm in France and would need to pay import tax and delivery which are crazy amounts. There is a French reseller of Grin products but the guy doesn't have any sense of customer service, and just wants money. Anyway it is too expensive.

So, if you can help me with that project, any information is useful. I don't have any soldering stuff, so best if I can buy components that are ready to be plugged together. If not, then I would need to pay someone to do it.

Thanks in advance
Best regards
Leo
 

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So you are looking for the Jack of all trades :ROFLMAO:

A Lishui FOC controller with the EBiCS firmware would fullfill all your wishes (making the legal flag switchable at runtime would have to be added). But if I'm reading you are not able to solder (and not willing to learn it, as far as I understand your post), I would recommend that you put the project out of your mind very quickly ;)

regards
stancecoke
 
So you are looking for the Jack of all trades :ROFLMAO:

A Lishui FOC controller with the EBiCS firmware would fullfill all your wishes (making the legal flag switchable at runtime would have to be added). But if I'm reading you are not able to solder (and not willing to learn it, as far as I understand your post), I would recommend that you put the project out of your mind very quickly ;)

regards
stancecoke
 
It's not about unwillingness to learn, I just don't have the skills to understand ALL the technicality and logic of this whole electronics/software development world. I don't want to put the project to the side, I'm not interested in judgments, only help.

It seems you are not willing to teach. Not everyone has the same technical level and experience. But I have the desire for variable regen and torque sensor.
I don't want to become a technician, I just want to know what to buy, how to connect it, how to use it.

Right now I am in the EBICS firmware page, and I have no idea what to do with it. I have android phone and macbook computer.

Can you send links of Lishui FOC controllers? The motor and batteries will be 48v
 
There is a wiki at GitHub, where everything is explained in detail. If you read it, understand it and did first experiments, of course you can ask for help... ;)


There is a page, where to get a Lishui controller, in the Wiki also.

regards
stancecoke
 
There is a wiki at GitHub, where everything is explained in detail. If you read it, understand it and did first experiments, of course you can ask for help... ;)


There is a page, where to get a Lishui controller, in the Wiki also.

regards
stanceco
There is a wiki at GitHub, where everything is explained in detail. If you read it, understand it and did first experiments, of course you can ask for help... ;)


There is a page, where to get a Lishui controller, in the Wiki also.

regards
stancecoke
🫤🫤🫤😞😞😞
 
If you want better guidance, at least set your budget so folks don't suggest things that don't meet your budget requirements.

Note that a torque sensor is a PAS. Pedal Assist Sensors come in two types, torque sensing and cadence sensing, Both are PAS units, so you are likely referring to a cadence sensor when you state PAS. Often torque sensing PAS units also provide cadence sensing, which can be incorporated into how PAS provides assist.

You probably won't get much guidance on your police controls. I see these requests often, but not much guidance given on how to skirt the law in your country.

You may want to prioritize your list since a few items will conflict with your unstated budget requirements. Because your wish list is so extensive and broad, I can see how folks may be reluctant to commit to the amount of effort required to take it on from beginning to end.
 
If you want better guidance, at least set your budget so folks don't suggest things that don't meet your budget requirements.

Note that a torque sensor is a PAS. Pedal Assist Sensors come in two types, torque sensing and cadence sensing, Both are PAS units, so you are likely referring to a cadence sensor when you state PAS. Often torque sensing PAS units also provide cadence sensing, which can be incorporated into how PAS provides assist.

You probably won't get much guidance on your police controls. I see these requests often, but not much guidance given on how to skirt the law in your country.

You may want to prioritize your list since a few items will conflict with your unstated budget requirements. Because your wish list is so extensive and broad, I can see how folks may be reluctant to commit to the amount of effort required to take it on from beginning to end.
150 to 450€.

Eiher be helpful or don't write at all please. Keep your judgments.

The most important is variable regen and adjustable torque sensor. And the ability to set speed and watts limits quickly.
 
With this budget you can get a suitable controller + display and a BB torque sensor, no problem. However, nobody will do the flashing of the appropriate firmware and the soldering of the necessary connectors for you. So you will have to learn the basics yourself.
Good luck!

regards
stancecoke
Thank you for the links Stancecoke, that's the kind of info I need. If you know of other controllers, let me know.

Can you elaborate shortly on the concrete steps for "flashing of the appropriate firmware"?

What would need to be soldered exactly and why? Please be specific
 
I also did have some suggestions for some of your questions but now think I better keep them to myself as I fear you may perceive them as "judgemental."

Good luck!
 
Can you elaborate shortly on the concrete steps for "flashing of the appropriate firmware"?
As written before, just read and understand the Wiki!
There is another option, that might be easier for newbies:

What would need to be soldered exactly and why? Please be specific
You want to have three analogue inputs
- throttle
- torque from the BB sensor
- linear regen by a lever or additional throttle

The linked controller has only one analogue input available for the user, the torque input.
So you have to remove the PCB from the housing (the controller is potted, so it is some work to remove the potting) and solder in the additional wires. As this new generation of Lishui controllers are prepared to read in the motor temperature on the second additional analogue input, you have to find and remove the pull up resistor for the NTC on the PCB. No witchwork, but it takes time and calm to deal with it.

regards
stancecoke
 
I also did have some suggestions for some of your questions but now think I better keep them to myself as I fear you may perceive them as "judgemental."

Good luck!
If you are helping based on my needs, how can I see it as judgement? Everyone knows when there is judgment tints hidden in sentences and when it's genuine willingness to help. I'd be happy to read your suggestions
 
You want to have three analogue inputs
I suppose throttle and BB sensor could be combined outside of the controller, as realistically you just want the higher of the two, no?

If OP did that and relaxed their variable regen requirement then opening of the controller and modifying it (which let's face it, isn't getting done properly by the OP themselves and would likely cost too much from a pro) wouldn't be necessary.
 
as realistically you just want the higher of the two, no?
No, the torque signal has to be processed with the cadence signal in order to calculate the riders power, while the throttle should be independent from the cadence.

pmotor = assist factor * phuman = factor * torque * cadence

And I think it is easier for @leo3387 to solder just a wire to an existing solderpad on the PCB than soldering external diodes etc to protect the peripheral components... ;)
 
If you are helping based on my needs, how can I see it as judgement? Everyone knows when there is judgment tints hidden in sentences and when it's genuine willingness to help. I'd be happy to read your suggestions
I'm 90% sure that this is an issue with the translator you're using. Reading the posts directly in English, I don't see anything judgmental. In fact, going in the opposite direction seems to be nearly as bad, since the translator makes you sound a bit like a jackass, so it has to be an issue with the translator. I noticed some of them are really bad. Google seems to work OK.
 
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