MkngStffAwesome
Active member
Can someone test some of the VESC features that to me seem like the reason to buy the VESC, But thus far i dont think have been tested.
You can test these on FOC or BLDC. I assume BLDC
The first is RPM limiting.
Using this setting seems like it would largely resolve a bunch of issues we face.
1) Motor RPM V Battery Voltage
One problem we have is that as battery voltage drops so does current and total power and therefore Boost
This is annoying if you want to use the total capacity of your cells because boost will drop.
2.8V to 2.0V as a percentage is huge and therefor the change in boost as the voltage drops will also be huge.
The VESC theoretically has a way around this problem by using the the eRPM limiter
The E-Turbo would firstly be setup /designed to create your desired boost at 2.0v not 2.8... This would mean that at 2.8v you would be "Over Boosting"
However to stop the "Over Boosting" when the battery is not flat you would set the erpm limit to what you get at 2.0v
This would then result in the same boost no matter the battery voltage. NICE
2) More consistent Boost at lower RPM
Another issue we have is that while we may make 5psi at redline, at 1/2 redline the boost is significantly higher. This is the case because obviously the engine needs less air, However the increased restriction also causes the E-Turbo's eRPM to be drastically higher. This higher RPM multiplies the problem by causing more boost..
If we use the Erpm limiter this would reduce the impact of full power at low rpm because it would hit the same eRPM limiter.
This would not completely solve the problem but help greatly.
@AlexLTDLX
Any chance of testing this
1) Set the ERP limit lower than what you can achieve now.
A)Test limit
B) Move one of the terminals on your LTO's to reduce the cell count to simulate a voltage reduction. See if you get the same eRPM
2) While going flatout and hitting the limiter.. Block the outlet and see if the vesc is able to maintain the same RPM
Thanks
Another particularly interesting thing to test would be PID mode, where you affectively control the motor based on RPM . This would be amazing to test.. I don't know if this works with BLDC mode so that would be interesting to check too.
You can test these on FOC or BLDC. I assume BLDC
The first is RPM limiting.
Using this setting seems like it would largely resolve a bunch of issues we face.
1) Motor RPM V Battery Voltage
One problem we have is that as battery voltage drops so does current and total power and therefore Boost
This is annoying if you want to use the total capacity of your cells because boost will drop.
2.8V to 2.0V as a percentage is huge and therefor the change in boost as the voltage drops will also be huge.
The VESC theoretically has a way around this problem by using the the eRPM limiter
The E-Turbo would firstly be setup /designed to create your desired boost at 2.0v not 2.8... This would mean that at 2.8v you would be "Over Boosting"
However to stop the "Over Boosting" when the battery is not flat you would set the erpm limit to what you get at 2.0v
This would then result in the same boost no matter the battery voltage. NICE
2) More consistent Boost at lower RPM
Another issue we have is that while we may make 5psi at redline, at 1/2 redline the boost is significantly higher. This is the case because obviously the engine needs less air, However the increased restriction also causes the E-Turbo's eRPM to be drastically higher. This higher RPM multiplies the problem by causing more boost..
If we use the Erpm limiter this would reduce the impact of full power at low rpm because it would hit the same eRPM limiter.
This would not completely solve the problem but help greatly.
@AlexLTDLX
Any chance of testing this
1) Set the ERP limit lower than what you can achieve now.
A)Test limit
B) Move one of the terminals on your LTO's to reduce the cell count to simulate a voltage reduction. See if you get the same eRPM
2) While going flatout and hitting the limiter.. Block the outlet and see if the vesc is able to maintain the same RPM
Thanks
Another particularly interesting thing to test would be PID mode, where you affectively control the motor based on RPM . This would be amazing to test.. I don't know if this works with BLDC mode so that would be interesting to check too.
