openinverter forum

Hi,

I am new to the forum and I was having trouble finding specific information on whether or not the Nissan Leaf™ Gen 2 controller can operate in a 4 quadrant torque control mode. Anyone have any pointers on this?

Thanks,

-Alex

Yes, both, Nissans OEM board and the open inverter board operate in 4-quadrants

johu wrote: ↑Tue Oct 26, 2021 5:16 pm Yes, both, Nissans OEM board and the open inverter board operate in 4-quadrants

-Thanks for the quick response. Is there any other limitation or can it be run as a pure amplifier if desired? By that I mean, it can be run without speed or directional constraints for instance? Can this be all done with a single CAN command, IE, torque/current, positive or negative?

I will try and clarify my questions a bit more. The source of our question is based on things we have seen with industrial automation drives, and other drives which can be somewhat of a "black box" solution where you give a commanded torque, and get something different as an output, without having much visibility into why.

When operating in a torque control mode, there are potentially other control loops operating to say, limit motor acceleration rate, or velocity, in addition to the torque control loop. An example of the situation is in the attached graph where the red plot is the commanded torque in Nm and the blue plot is the actual torque. We were running a sinusoidal torque command, and were have trouble determining why the actual torque plot did not track the commanded torque. It turns out there was an acceleration limit that was a little too low, and so as the motor was spinning up based on the sinusoidal toque command, the acceleration limit was reducing the actual torque.

That being said, and being fairly new to EV drives, we just wanted to make sure that when we give a torque command, we would get the commanded torque out without any other control loops, such as acceleration limiting or velocity limiting, if desired. I have read certain EV manufacturers have certain limits built into the software for say, speed limit when in reverse, and we wanted to make sure this was not the case.

Thanks!

There is a configurable throttle and regen ramp and regen attenuation at low speed. But them being configurable means you can turn all that off if required.

Excellent, thanks this answers our question.

Best,
Alex