regain throttle sensitivity after controller shunt mod?

Electric Motors and Controllers
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vex_zg   100 W

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Posts: 178
Joined: Mar 06 2016 6:07pm

regain throttle sensitivity after controller shunt mod?

Post by vex_zg » Aug 31 2017 1:07pm

It's a kunteng KT40 12MOSFET controller with LCD3.

After shunt mod and beefing up traces it works quite punchy, up to 85A (originally it was rated 30A cont 60A max) but dificult to find the throttle position to keep a low speed gently as expected. The reation to the throtle are too twitchy in the beginning of the throttle twist.

The throttle is a cheap wuxing half twist throttle with hall sensor and magnet.

are there any tricks to regain the low-power sensitivity?

casainho   100 GW

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Re: regain throttle sensitivity after controller shunt mod?

Post by casainho » Sep 17 2017 3:38am

Maybe when we have finished our OpenSource firmware for Kunteng STM8 controllers, we can develop a feature to configure different values for regen.
- EBike wireless standard: wireless motor, wireless cycling GPS display Garmin Edge and wireless remote with wireless brake sensor
- TSDZ2 FAQ: issues and repairs, etc
- TSDZ2 OpenSource firmware

Developer of OpenSource knowledge and technology for ebikes: Wireless EBike standard ANT+ and Bluetooth, TSDZ2 OpenSource firmware, KT motor controllers and displays: Bafang 850C color, SW102 Bluetooth and KT-LCD3.

Please consider a donation to help developments: paypal.me/jorgecasa

vex_zg   100 W

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Posts: 178
Joined: Mar 06 2016 6:07pm

Re: regain throttle sensitivity after controller shunt mod?

Post by vex_zg » Sep 17 2017 8:49am

casainho wrote:Maybe when we have finished our OpenSource firmware for Kunteng STM8 controllers, we can develop a feature to configure different values for regen.
I am always looking if I could find a way to join but I have a baby on the way and wife watching my every step :)

I am not asking about anything regen related but throttle sensitivity reduction because it's too jumpy on high currents during startup when a shunt mod has been made.

So the request for you would be is basically to make soft-start modes and throttle curve adjustment and torque-mode (vs. rpm mode) for the throttle control

In the meantime I will probably make a voltage divider and remove some material from the magnet in the throttle.

casainho   100 GW

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Joined: Feb 14 2011 2:43pm

Re: regain throttle sensitivity after controller shunt mod?

Post by casainho » Sep 17 2017 10:34am

vex_zg wrote:
casainho wrote:Maybe when we have finished our OpenSource firmware for Kunteng STM8 controllers, we can develop a feature to configure different values for regen.
I am always looking if I could find a way to join but I have a baby on the way and wife watching my every step :)

I am not asking about anything regen related but throttle sensitivity reduction because it's too jumpy on high currents during startup when a shunt mod has been made.

So the request for you would be is basically to make soft-start modes and throttle curve adjustment and torque-mode (vs. rpm mode) for the throttle control

In the meantime I will probably make a voltage divider and remove some material from the magnet in the throttle.
Great, I already have a small boy, it's really good!!

Good that you seem to understand all the problem origins and I see also that cheap throttles to behave like that, that is the ones I use on my ebikes and for development.
The firmware currently almost works the motor control, even stancecoke developer already did and integrated the feature for a torque sensor!!
Maybe the time you will use to hack your hardware would be better invested on the feature you are looking for, on the firmware.
This next week I want to finish the current control/protection of the motor and with this close the motor control, so we can finish the basic firmware (throttle duty_cycle, maybe also torque/Id current and torque sensor. No regen and no LCD for now).
- EBike wireless standard: wireless motor, wireless cycling GPS display Garmin Edge and wireless remote with wireless brake sensor
- TSDZ2 FAQ: issues and repairs, etc
- TSDZ2 OpenSource firmware

Developer of OpenSource knowledge and technology for ebikes: Wireless EBike standard ANT+ and Bluetooth, TSDZ2 OpenSource firmware, KT motor controllers and displays: Bafang 850C color, SW102 Bluetooth and KT-LCD3.

Please consider a donation to help developments: paypal.me/jorgecasa

honya96   1 kW

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Joined: Mar 05 2015 9:38am
Location: Czech Republic

Re: regain throttle sensitivity after controller shunt mod?

Post by honya96 » Dec 13 2017 7:30pm

Try if this has some effect(1-3). Otherwise the Opensource firmware is the only thing which solves it completly.
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