Prius Gen2 A/C compressor inverter

Topics concerning the Toyota and Lexus inverter drop in boards
Post Reply
User avatar
imwoody36
Posts: 90
Joined: Fri May 01, 2020 2:20 pm
Location: Scottsburg Indiana
Contact:

Prius Gen2 A/C compressor inverter

Post by imwoody36 »

sure! i can confirm the gen2 a/c compressor is just a 3 wire connection from the bottom half of the inverter.
I will look for and document signals.
if anyone has a specific area of interest, it will speed up the process so I dont have to start from scratch with the schematics.
and I have a new siglent scope im eager to use
should we move that discussion somewhere ?... just give me direction
the priustoric boatcar guy
MattsAwesomeStuff
Posts: 540
Joined: Fri Apr 26, 2019 5:40 pm

Re: Prius Gen2 A/C compressor inverter

Post by MattsAwesomeStuff »

I'm just a cheerleader. I don't even know enough about what to ask, to ask.

*prods Johannes*

How he test make AC work good for all peoples?

I'm not even familiar with the whole Wish List of future development and what help might be needed.
User avatar
SciroccoEV
Posts: 315
Joined: Thu Oct 10, 2019 1:50 pm
Location: Luton UK

Re: Prius Gen2 A/C compressor inverter

Post by SciroccoEV »

It's well established that the aircon inverter drive is on the same PCB as the DC/DC converter on a Gen 2 Prius and runs at battery voltage.
User avatar
Ev8
Posts: 292
Joined: Sat Jan 30, 2021 11:05 am

Re: Prius Gen2 A/C compressor inverter

Post by Ev8 »

Yes but I don’t think anyone has logged the a/c control messages which could be super useful, unfortunately it’s not can bus but the Toyota Bean protocol which I believe is a 12v single wire multiplexed network.
MattsAwesomeStuff
Posts: 540
Joined: Fri Apr 26, 2019 5:40 pm

Re: Prius Gen2 A/C compressor inverter

Post by MattsAwesomeStuff »

SciroccoEV wrote: Sat Aug 06, 2022 10:11 pm It's well established that the aircon inverter drive is on the same PCB as the DC/DC converter on a Gen 2 Prius and runs at battery voltage.
It's not on the wiki, therefore, it might as well not exist.

Though, yes, I'm aware that's been known for a while. But, Johannes has specifically asked for someone to track the signals to the AC so that he can write something that emulates them. So, I'm just connecting people with knowledge with people that can use the knowledge.
User avatar
johu
Site Admin
Posts: 3730
Joined: Thu Nov 08, 2018 10:52 pm
Location: Kassel/Germany
Contact:

Re: Prius Gen2 AC compressor inverter

Post by johu »

So to start out the pin mapping of the grey 6-pin LV connector of the A/C inverter needs to be researched. Apparently it runs some sort of serial protocol. In a second step that would need to be recorded with a protocol analyzer at various operational states. Most obviously A/C on and off.

The connector is on the same side as the DC/DC control connector and located below MG2 power output
Support R/D and forum on Patreon: https://patreon.com/openinverter - Subscribe on odysee: https://odysee.com/@openinverter:9
turnip73
Posts: 8
Joined: Wed Dec 26, 2018 1:38 pm
Location: Greystones Ireland

Re: Prius Gen2 A/C compressor inverter

Post by turnip73 »

Link to prius wire diagram:
https://priuschat.com/attachments/prius ... pdf.33780/
See page 350

Connector:
I11(C)
(I11 Inverter 90980–10988)

1C GND
2C ITE/TOECU
3C ET1/TOINV
4C CLK
5C STB
6C IG

imwoody36 I can send you a man in the middle board if you are interested:
https://openinverter.org/forum/viewtopic.php?t=2516
User avatar
johu
Site Admin
Posts: 3730
Joined: Thu Nov 08, 2018 10:52 pm
Location: Kassel/Germany
Contact:

Re: Prius Gen2 A/C compressor inverter

Post by johu »

Is any meaning known? Sounds like 2C/3C is like MISO/MOSI style and 4C obviously the clock. But what are the other 2?
Support R/D and forum on Patreon: https://patreon.com/openinverter - Subscribe on odysee: https://odysee.com/@openinverter:9
turnip73
Posts: 8
Joined: Wed Dec 26, 2018 1:38 pm
Location: Greystones Ireland

Re: Prius Gen2 A/C compressor inverter

Post by turnip73 »

IG 6C 12 when ignition is on
STB 5C 12/14v while inverter is starting up then drops to ~1.5v. Didn't seem to change when a/c was turned on. I'll verify when my pack is changed.
User avatar
johu
Site Admin
Posts: 3730
Joined: Thu Nov 08, 2018 10:52 pm
Location: Kassel/Germany
Contact:

Re: Prius Gen2 A/C compressor inverter

Post by johu »

Cool, thanks. So these seem to be pretty static leaving only pins 2,3,4 to be connected to a logic analyzer, perhaps in SPI mode.
Support R/D and forum on Patreon: https://patreon.com/openinverter - Subscribe on odysee: https://odysee.com/@openinverter:9
linda.ljungdahl
Posts: 12
Joined: Fri May 14, 2021 8:05 am

Re: Prius Gen2 A/C compressor inverter

Post by linda.ljungdahl »

Would it be possible to use the ac-inverter as a 240 or 400v ac sine inverter to drive thing like tv, computer i.e if we get it running?
Tha would be super sweet :)
User avatar
johu
Site Admin
Posts: 3730
Joined: Thu Nov 08, 2018 10:52 pm
Location: Kassel/Germany
Contact:

Re: Prius Gen2 A/C compressor inverter

Post by johu »

Not really, it is targeted to drive a motor and will run on Toyotas firmware. So unlike the "real" inverters we can't clock out arbitrary waveforms
Support R/D and forum on Patreon: https://patreon.com/openinverter - Subscribe on odysee: https://odysee.com/@openinverter:9
User avatar
SciroccoEV
Posts: 315
Joined: Thu Oct 10, 2019 1:50 pm
Location: Luton UK

Re: Prius Gen2 A/C compressor inverter

Post by SciroccoEV »

An off the shelf VFD would probably drive the compressor just fine. Most of my machine toolks are using HuanYang inverters and that includes the router with the 24,000rpm synchronous spindle motor.

You can just bypass the input rectifier and go straight to the DC bus. I haven't bought one for a while (the oldest has been in use for over a decade on my lathe), but I was paying about £80 delivered for a 2.2kW unit.
Post Reply