zombieverter irratic torque demand in VCM CAN message

[mattes]

Have the zombieverter hooked up to a 2020 Leaf inverter/PDM 110kw stack, together with leaf batterie.

Started scanning the CAN log traces from those runs and noticed this 'weird' series of torque demands sent by the VCM (zombieverter), when I apply the throttle. It looks weird to me. Maybe this is normal? Dont know, I am just new to all this. But I don't see that pattern with the original Leaf OEM VCU.

Do I have some misconfigured that contributes to this behavior? What am i missing in the zombie setup?
I did multiple runs and see this everytime after start, when I apply the throttle.

The first initial torque request by the VCM is 511Nm (isn't that max torque or more?).
The second 5Nm seems to be the value from the throttle, and the third is again 511Nm followed by another 5Nm
The irratic 511Nm seems to be sent all the way until max throttle is reached.

Here my param.json and a savvycan trace.

[mattes]

I might have found what was bugging my setup.

The zombieVerter parameter "throtramp" was set to 100. Such setting seems to spike the throttle torque demand.

Not sure how it got into my configuration set. some kind of default? Not sure, but I certainly did not touch that.

Anyhow here are 2 screenshots showcasing the Zombie VCM torque demand request CAN message for throtramp 100% and throtramp 10% configuration

[tom91]

Not sure how it got into my configuration set

It was set to a 100% as default for older firmware. Latest forces it to 1 I believe.

[Rustybkts]

I was about to start a new thread titled Uncontrolled throttle with Zombie on Leaf inverter but saw this one.

Initial testing using version 2.20 seemed OK with throttle control but lacks power in reverse which is already known and I assume will be sorted on the next update.
Since doing other testing with a test version 2.31TH I find that when increasing speed over around 10mph, the drive goes to full power spinning the wheels! Scary on my short drive!!!
I have loaded the latest gold update version 2.22a but no difference
Have attached CAN logs with the Ignition on in neutral and full accelerator pedal and another CAN log with the car in FWD selected and throttle gently pressed past 10mph until the revs are uncontrolled. Parameter list also attached.
I have checked the accelerator pot volts and they are smooth from minimum to maximum without any jumps.

Any assistance would be appreciated on this as it has already snapped the torque bracket on the drive unit which is now beefed up.

[tom91]

Please generate logs of Potnom

[tom91]

To start

"throtramprpm": 1000 set this back to 20000rpm. This disables throttle ramping.

The rest looks pretty standard if you say the throttle values look normal when plotting.

[Rustybkts]

Not sure how to save a plot and its easier to take a pic of the plot.
Pot volts is Red and Potnom is Blue. Due to the immediate increase in rpm, the vertical drop on the red trace is me taking my foot off the pedal.
You can see the spike on the Potnom trace.

[tom91]

Is this after making the change as requested?

[Rustybkts]

No, just made the change and it seems OK now. That is scary though.
What is that parameter used for.
I am testing with the wheels in the air so it's not a proper test until I can go on the road.

[tom91]

What is that parameter used for.

"throtramprpm": 1000 set this back to 20000rpm. This disables throttle ramping.

And can wreak havoc in the various places where the throttle can be ramped. Will likely move to remove this in a future release.

[Rustybkts]

My project only seems to require the reverse torque increase to be added to the gold version although I may go back and try v2.31TH as that had all the functionality apart from the request HV input I will us with an Orion BMS controlled Chademo.
I note on another thread viewtopic.php?p=82601#p82601 that others are having contactor control problems but I have not seen this at all.

[tom91]

Have now removed the throtramprpm as this is not really something being used in the VCU

https://github.com/damienmaguire/Stm32- ... 95998aa659

[mattes]

I just curious, what was/is the intent of ramping up the throttle reading?
quicker pedal response?

[tom91]

I just curious, what was/is the intent of ramping up the throttle reading?
quicker pedal response?

Not how it works. The throtramp limits how quickly in percentage the throttle can increase per loop of 10ms. This will dampen all sorts of limits and sudden pedal inputs.

The throtramprpm would be the rpm at which this gets dis-regarded, no one was running this on zombie its carried over from OI inverter boards. It no longer works so will be removed.