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  1. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    It has been a long time since I looked into this forum. I see some people have issues with the motor having resistance on coasting. I also noticed this and found this irritating. You need to look at the dutycycle your motor runs at versus the speed and then you can calculate the constant...
  2. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    No the speed limit when pedaling (25kmh) can be different from the speed limit when only using throttle (6kmh). Its just like you want it to be, throttle only to 6kmh, pas to 25kmh
  3. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    When you are pedalling and in the legal/not the offroad mode, the throttle will not increase your speed, it will give maximum assistance when activated, but when the speed reaches the speedlimit, the power is dialed back.
  4. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Did you fix yet?
  5. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    If offroad mode is enabled, the speedlimit is set to 80 kmh in the code. So I think the "Offroad" box in the Osec parameter configurator does nothing.
  6. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I do not think there is an easy way of doing this. I can say that I like the firmware now. But I noticed a few things after upgrading, so here are my findings: My controller was originally a square wave controller, the top speed was higher, but with field weakening it is the same again. There is...
  7. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    As you probably saw, it worked. I will make another pull request when I tested all my changes for now I have implemented the simple cruise feature for my lcd8 in my fork, which I already tested. In my personal offline setup I have made more bitshifting changes, but I cannot really implement them...
  8. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Yes I will see if I can use that function to make it work. For now I see that the pwm to the mosfets is disabled on startup and is enabled on first call of the aca_setpoint function, if there is enough battery voltage. I would still need to figure out if there is already a value for erps true to...
  9. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I would still like to know if I can restart the controller safely when not standing still, will this result in a very high regen current on boot?
  10. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I have determined my cal a value and I calculated it to be 4.5. :shock: How can that be? The raw ADC value jumped from 314 to 322 when drawing 18A. This means 0.44 ADC value per amp. Also when the motor is standing still the raw ADC value is around 318 and the setpoint is zero, so it is not...
  11. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I have made a couple of test rides with this firmware now. First of all the switch from square to sine wave at low speed is much more silent compared to the stock controller. I think the square wave controller disabled pwm on braking and maybe on coasting too, because you could feel the power...
  12. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    You could connect it on the throttle line probably but the code would need to be changed. On x4 you will also get more resolution I think. It is not hard to identify the resistor to remove (see images).
  13. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Yes I just checked it and the computation for the torque sensor is more efficient. So the torque_from_x4 branch is probably only intended for people that use torque sensors.
  14. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Does the LCD3 also have a cruise feature? I have also made it work again with holding the down button on my LCD8, but I cannot get it to push to github... What could be wrong then?
  15. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Usually the step down converter minus is connected to the output minus if it is not an isolated voltage converter. So it will probably work without connecting the output minus, but there may be some resistance in the minus trace of the converter.
  16. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    A lot of people and me use this one: https://a.aliexpress.com/_vlAJAe and the delivery is like 2-4 weeks for me usually and I live in europe too. Throttle min and max you can determine in at least three ways. 1. By printing the ADC value (I dont know the name in the code now) or setting throttle...
  17. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    There are cheap 120V/90V to 12V 3A modules on aliexpress that are a good fit for this. Another thing to consider might be the resistor divider to the processor to read the battery voltage. If you use that functionality you might want to check that you won't burn out a I/O pin.
  18. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    The mosfet of which I can read the text can handle 84V I think, so in that area you are okay, but the capacitors may be 50V rated, I can't really read the rating on them. If they are 50V rated you should upgrade them and maybe also put a bigger resistor in front of the LM317 or change it to a...
  19. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Well it was probably even less work than going to the FAQ, but do you know about the other questions I had in my previous post?
  20. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    I am tinkering with the open source firmware and I have made the firmware work with the LCD8H almost as stock now. The big trick to get it working is setting the second xor variable in the if statement to 23. I found this with a simple program, which tested a bunch of numbers and notified me...
  21. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Thanks for the answer snips. I will go for the 100A version Somebody else knows if the LCD8 is supported? I like the LCD8. Maybe someone can explain how the communication between screen and controller works, so I can program it to have the same features. Somebody mentioned his light switcher...
  22. O

    KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)

    Hi everyone, As someone recently also tried, I would like to upgrade my 18 mosfet 48VZWS controller with a current sensor (ACS 758 right?) to run the open source firmware, because with the stock KT firmware, the motor gets quite hot and it makes a lot of noise and maybe I will get a bit more...
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