MG1 & MG2

I suggest starting with this document

 

I had not visited John's web site in a while and it has really grown impressively. Kudos for providing this great service. Do you ever report on site visit statistics? I'd be curious to know.

 

<div class='quotetop'>QUOTE(tochatihu @ Aug 24 2006, 10:52 PM) [snapback]309182[/snapback]</div>

Nope. But I do from time to time mention HSD User-Guide PDF activity. That statistic goes back 28.5 months (since early March 2004). Over that time, there have been 177,848 downloads. Pretty cool, eh?

 

<div class='quotetop'>QUOTE(john1701a @ Aug 25 2006, 12:29 AM) [snapback]309203[/snapback]</div>

Very cool. I think I performed download numbers 171,314 and 177, 799 (wanted the updated version), so thank you very much.

Is this enough to qualify you as a published author?

 

John, I'm finding a ton of really interesting information on your site. Thank you for that.

One of the things that caught my attention was in the "how it works" section and specifically the sub-section "engine and motor drive". It says that in this mode, the PSD distributes 72% of the engine thrust to the wheels and 28% to the small motor. What is the significance of this particular split? Is that the setup in which all three PSD shafts turn at the same speed?

 

It's true for the precise word 'torque' (and I'd give generous partial credit to 'thrust' as it's pretty close). 72% of the engine torque goes mechanically to the tranny output, and the other 28% goes to MG1. That can't ever change because it isn't anything more than count-the-teeth-on-the-gears math, and they don't change their numbers of teeth.

That split is the same whether the engine is producing a lot of torque or a little, whether the car is going fast or slow, and whether the motor speeds are the same or different.

It means that some of the engine power (not torque) follows a straight mechanical path to the wheels, and the rest of it follows an electrical path involving MG1 and MG2, ending up at the same place. That split of power is not always 72:28, because power is torque ✕ rpm and the pieces are not always spinning at the same speeds. At any moment, you can reckon how much power is taking each path, by using the unchanging 72:28 torque split and taking the engine and MG1 rpms into account.

 

Thanks. You're saying that the torque split is always 72:28, even when the shafts are turning at different speeds? I need to ponder that.