a new document for Prius... PSD

[john1701a]

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Check it out... http://john1701a.com/prius/prius-psd.htm



...and then help me fine-tune the wording. SIMPLE is the key. I went to extremes to eliminate everything but the barest essentials, both in text & diagram. The purpose is to inform newbies how Prius actually works.

[Frank Hudon]

two have to move, if the car is stationary the ICE and MG1 can rotate or MG1 and MG2 can rotate or all three can rotate. Two have to move or all have to be stopped. MG1 rotates forward or backwards depending on what the other two components are doing. The ICE can only rotate one way. MG2 can rotate either way as well but if one component of a planetary is moving one of the other or both have to move.

[xevious]

John, you correctly identified the power sources in the text, but you interchanged ICE and MG2 in the diagram.

To add to Frank's comment, and potentially part with the SIMPLE directive, either MG1 or MG2 can add rotational velocity to the ICE.

[rick57]

<div class='quotetop'>QUOTE(xevious\";p=\"76167)</div>

John, you correctly identified the power sources in the text, but you interchanged ICE and MG2 in the diagram.

To add to Frank's comment, and potentially part with the SIMPLE directive, either MG1 or MG2 can add rotational velocity to the ICE.[/b]

You beat me to it, xevious, in catching the ICE and MG2 switch in the diagram,haha. But I do question on your comment about MG1 OR MG2 adding velocity to the ICE. MG1 doesn't actually do any driving,it powers MG2 when ICE needs the added help.

Driving modes:
1. ICE drives the wheels
2. ICE and MG2 drive the wheels. ICE is also spinning MG1 which is generating electrical energy for MG2
3. ICE and MG2 driving the wheels. MG2 is using electrical energy from MG1 and also from the HV battery
4. MG2 is driving wheels with electrical energy from the HV battery. ICE is not driving the wheels in this mode but may or may not be running depending on various parameters

If this is what you meant, sorry if I misunderstood your description. I aquired this info from the 04 NCF, pages TH-2 thru TH-16 if anybody would like to study it, 8)

[rick57]

Oh and John, I think the PSD you are working on is going to be a big help for those new to the Prius and wanting to more about the workings of such a technical wonder.

[john1701a]

Yes. In my haste to glue together all the components I had been working on, I pasted the labels into the wrong textbox.

I really struggled to figure out how detailed the text should be and what type of layout. So I revealed the draft, hoping for feedback.

It sounds like I'm on the right track now. I've always wanted a very simple way of explaining how the system worked... and last week's gathering pushed me to finally create something. (My verbal, on-the-fly descriptions were not as effective as I had hoped.)

By the way, I intentionally avoided using ICE, MG1, MG2 references (hence mixing up terms). I'm hoping that makes more sense to a newbie.

Thanks for helping out.

[htmlspinnr]

Rick,

There's a theory that in certain situations, MG2 *can* operate as a generator (not regenerative), and MG1 can operate as the drive motor (reversed from the ICE). Operating in this way produces an "overdrive" effect. It's refered to as "heretical mode".

It's not really documented except on Graham's Prius site. When putting deep thought into it, it makes sense. None of the Toyota docs go into it though.

[john1701a]

> MG1 doesn't actually do any driving

That's what the "for generating electricity" note is for.

If there is a clearer way of saying that, send revised text my way. (It's those misunderstandings that we trip over now that we'll really benefit from in the end.)

Also, I was really really tempted to present the info in bullet fashion. But just a normal paragraph won in the end.

[rick57]

<div class='quotetop'>QUOTE(htmlspinnr\";p=\"76204)</div>

Rick,

There's a theory that in certain situations, MG2 *can* operate as a generator (not regenerative), and MG1 can operate as the drive motor (reversed from the ICE). Operating in this way produces an \"overdrive\" effect. It's refered to as \"heretical mode\".  

It's not really documented except on Graham's Prius site.  When putting deep thought into it, it makes sense. None of the Toyota docs go into it though.[/b]

Hi Rick. I guess if you think deep into it,anything can be possible. Maybe Toyota docs don't talk about it because they don't make it work that way, Just found Graham's website and bookmarked it ( have already marked John's site ). Will read over the workings later when I have some more time. Lots of math, oh goody

[Frank Hudon]

MG1 is a permanent magnet generator, capable of generating while rotating either direction. (if you insert this into the diagram I think people will have an easier time grasping the function of the "generator statement) (this part for the more technically competent) The magnetic lines of flux cut thru the windings going either way and because the output is 3 phase AC, positive and negative are irrelevant as it's constantly changing.