I struggled to follow exactly what happens in each scenario but you may well be correct. I think the best procedure would be:catphish wrote: ↑Sat Oct 16, 2021 1:31 am Please correct me if I'm barking up the wrong tree here, but my reading of this leads me to understand that there are two separate clutches, one for each ratio, and only one should be engaged at a time. If this is the case, is it not plausible that one solenoid deactivates the high ratio gear, and the other activates the low ratio gear? If this is the case, the correct procedure is to activate one solenoid ahead of the other, preventing both being simultaneously engaged?
On Monday I will wire up my oil pump and experiment with this on the bench. Hopefully I'll be able to observe the affect of activating each separately at rest and at low speed.
Set torque to zero
Disengage motors from output shaft (if possible)
Match MG2 speed with new output shaft speed
Engage new gear selection
Reapply torque (ramp up)
This makes sense. From experience, the High gear gives plenty of acceleration already, you may find yourself never using the Low gear.
I was thinking about doing it the long way - testing in the winter and then the summer when the ambient temperatures are quite varied (at least, where I love). I looked at the document I linked earlier in a hope of finding out where the temperature sensors are located. Likely the MG1 and 2 sensors are buried in the stator windings can can't simply be removed.
Yes, it would be good to generate a truth table for the 4 possible states for this. This could maybe be as simple as running MG2 on the bench, applying a small load (gloved hand may be enough) to the output flange to see what's engaged and at what speed, in the various states.catphish wrote: ↑Sat Oct 16, 2021 1:31 am Edit: I realise the questions about the gearing are a little off topic, and a Ravigneaux gearing is somewhat more complicated than I can wrap my head around at the moment. I will start a new thread about this. I found Damien's presentation on this gearbox. It certainly implies that the sensible thing to do would be to deactivate one clutch (brake) momentarily before activating the other. It also seems plausible that only one should be activated at once (as opposed to neither / both together. I will test when I can.