Throttle for panasonic controller

[mariut]

Hi,
Bike maker is Kalkhoff and the controller maker is Panasonic. I want to add a throttle to it. I found out there is an extra cable comming out of the controller box so I guess it is intended for throttle. There is a 4 pin socket, but only three wires, one of the middle pins is not connected. First pin (red wire), second pin (yellow wire +5V), third pin (not connected), fourth pin (black wire ground). I tried to connect a 10k potmeter but there is no response to it. The questions are: is this extra cable intended for throttle? and if yes what kind of throttle should I use?
Additionally, has anybody any idea what kind of signal comes out from PAS to panasonic controller ?, there are three wires: white, yellow and blue and when disconnected from controller the resistance is about 77Ohms between white and yellow and same between blue and yellow.

 

[TRACTOR DAN]

Hi, if it is intended to use with a throttle it is most likely a hall effect throttle.
It would make sense as hall throttle use 3 wire (+5v ,ground ,signal).

 

[mariut]

Hi, if it is intended to use with a throttle it is most likely a hall effect throttle.
It would make sense as hall throttle use 3 wire (+5v ,ground ,signal).

Thanks for your suggestion, unfortunatelly it doesn't work, I have read somewhere that maybe panasonic controller requires an extra signal to enable the throttle, but I am not sure if it is true, anyway I managed to connect the throttle in parallel to the PAS and it works just fine.

 

[E-HP]

Hi,
Bike maker is Kalkhoff and the controller maker is Panasonic. I want to add a throttle to it. I found out there is an extra cable comming out of the controller box so I guess it is intended for throttle. There is a 4 pin socket, but only three wires, one of the middle pins is not connected. First pin (red wire), second pin (yellow wire +5V), third pin (not connected), fourth pin (black wire ground). I tried to connect a 10k potmeter but there is no response to it.

Although there are no real standards for conductor colors, I'd be very surprised that a throttle connector where the red and black conductors weren't 5V and ground, with the third wire (many times blue) being the signal wire. The output of the signal wire on a throttle has to be in the valid voltage range to operate, which is listed on the label of many/most controllers.

Additionally, has anybody any idea what kind of signal comes out from PAS to panasonic controller ?, there are three wires: white, yellow and blue and when disconnected from controller the resistance is about 77Ohms between white and yellow and same between blue and yellow.

The output of the signal wire is digital (a type of square wave). The signal can be different depending on the direction of rotation, so sensor orientation is important.

 

[mariut]

The output of the signal wire is digital (a type of square wave). The signal can be different depending on the direction of rotation, so sensor orientation is important.

Right, square wave is output on the yellow wire and there is 0V between blue and white wires when the pedal is not pressed, when the pedal is pressed the squareish wave appears between blue and white wires, the stronger the force the higher the amplitude, the white wire has a higher potential than the blue one so to use the PAS input to control the motor you need to decrease the resistance between the yellow and white wires or increase the resistance between the yellow and blue wires. Additionally the change in resistance must periodically disapear for example every second, otherwise the controller displays a failure message and will have to be restarted. Thank you for your assistance.

 

[TommyCat]

Additionally the change in resistance must periodically disapear for example every second,

… curious as to how you accomplished this. And does the throttle operate like a normally connected one would?


Regards,
T.C.

 

[mariut]

… curious as to how you accomplished this. And does the throttle operate like a normally connected one would?


Regards,
T.C.

Well I used a microprocessor to do this and supplied it with 5v dc which is available on the extra cable that I mentioned before. No it does not operate normally, it is really tricky to change the speed of the motor, I was able to do that without load but when riding the bike it does not work very well so i set fixed speed, but since there are 8 gears I can set 8 diffrent speeds from 10 to 25 km/h, so my throttle is actually a pushbutton but it works pretty cool and the whole solution is very cheap, much less than two euros.

 

[TommyCat]

Thank you for your reply. Alas, it is how I suspected. Would you mind sharing what processor you used and your code?

As far as cost, would a programmable 555 timer IC and pushbutton do the same thing?

 

[mariut]

Thank you for your reply. Alas, it is how I suspected. Would you mind sharing what processor you used and your code?

As far as cost, would a programmable 555 timer IC and pushbutton do the same thing?

It is bluepill stm32f103c6t6, I'm pretty sure you can do the same thing on 555 timer but I'm not an expert about electronics so it is much easier for me to use microprocessor instead of designing analog circuit. I attached the file with code but I guess it won't be helpful for you.

 

[TommyCat]

I attached the file with code but I guess it won't be helpful for you.

Sorry I don’t see any attachment… As the Blue Pill is somewhat compatible with the Arduino, that I work with. I would still find your code interesting.

 

[mariut]

Sorry I don’t see any attachment… As the Blue Pill is somewhat compatible with the Arduino, that I work with. I would still find your code interesting.

I am sorry for that. That is exactly arduino file with the extension .ino and it seems this is the problem so I've just changed the extension to .txt.