Lexus GS450H VCU Support Thread

[Alexstarex]

Hello.
I can not find the SPL file for the GS450H.
can anyone help find him.

[Jack Bauer]

You mean CPL file? Really? you want me to release the design before I even test the board? Sure ok why the hell not.I like it. Kinda like NASA in the 60's. No risk no reward and all that.
V2 design files now released on Github :
https://github.com/damienmaguire/Lexus- ... Controller
Partially built boards released on the webshop. Untested of course but progress cannot wait:
https://www.evbmw.com/index.php/evbmw-w ... oards-copy

[Kevin Sharpe]

V2 design files now released on Github :

Time for popcorn

[Jack Bauer]

If I can just get this esp8266 to stop boxing me into corner everytime I look sideways at it we'll have a wifi interface:)

[Dilbert]

Web interface looks good.

I received the V2 board yesterday (thanks JB). Main problem was that my solder paste was rock hard as i haven't used it in so long, so i had to solder the CPU on by hand.

A couple of very minor things, might save someone else a bit of time:
1) D3 the main 12V diode seems to be backwards
2) As per the video R20-R21 should be 39 Ohms, i fitted 33 and it works fine
3) D1,D4,D5 are getting quite warm, these are the protection diodes, haven't looked up the part number but am wondering are these possibly flipped.
4) The reset circuit has a cap pulling it up to 5V not a pull-up. I'd imagine this should be a pull-up resistor.


It looks good over-all, definitely use solder paste when doing the CPU

[xp677]

I answered a similar question to your point 4 in the Tesla Charger thread, so I already have the answer to hand! From the SAM3X8E datasheet:

The NRSTB pin is input only and enables asynchronous reset of the SAM3X/A series when asserted low. The
NRSTB pin integrates a permanent pull-up resistor of about 15 kΩ. This allows connection of a simple push button
on the NRSTB pin as a system-user reset. In all modes, this pin will reset the chip including the Backup region
(RTC, RTT and Supply Controller). It reacts as the Power-on reset. It can be used as an external system reset
source. In harsh environments, it is recommended to add an external capacitor (10 nF) between NRSTB and
VDDBU.

This capacitor is also present on the Arduino Due schematic (component C20).

Regarding point 2, these resistors are for the DFSDM and DFSDP inputs, these are for "full speed" USB, I can't see there being an issue with the slightly altered resistor values. The purpose is not explained in the datasheet (but the resistors are present in the example drawings) and I am not familiar enough with USB to comment. Though I imagine that the transfer rates for your purpose are low enough for it to not matter.

[Jack Bauer]

All of the diodes are reversed on this build and need to be flipped.

[Dilbert]

This capacitor is also present on the Arduino Due schematic (component C20).

The internal pull up must be very weak and this CAP provides additional dynamic "pull up" on the reset pin.

I ordered a GEN3 Prius inverter so my plan is to use the info I've gathered from the Auris with this ECU to see if I can turn my trans-axle. I need to order the ECU case and connector from mouser.

Thanks all for the replies.

[xp677]

Hopefully you'll be able to make sense of the MTH data and will be able to get communication going! If so, please do share the results. Hopefully, this controller will work on many of the Toyota/Lexus inverters with just a firmware update to change the information sent.

[Jack Bauer]

Appreciate the work guys.

[Dilbert]

I couldn't see a wiki page for this ecu, we must set one up to capture some of this info.

Does anyone have the part numbers for the plug/crimps which plug into the ecu handy? I want to get these in to make a harness.

[xp677]

I started a Wiki page, I'll try to get whatever info I can into it.

https://openinverter.org/wiki/Lexus_GS450h_Inverter

Which ECU are you referring to? The Prius HVECU?

[PacEmaker]

I couldn't see a wiki page for this ecu, we must set one up to capture some of this info.

Does anyone have the part numbers for the plug/crimps which plug into the ecu handy? I want to get these in to make a harness.

If you are referring to Damien's GS450h inverter controller board - here is his reference to the part numbers for the plugs and crimps (that don't appear in the BOM but appear on his Github 'pinout' page for this project):

33472-2002 (left side, grey in colour)
33472-2001 (right side, black in colour)
33012-2002 (pin crimps)

Mouser has the plugs available individually without having to buy 5 or more at a time. They have the pin crimp thingies available individually or in strips of 100 or reels of 6000!

[Kevin Sharpe]

I started a Wiki page, I'll try to get whatever info I can into it.

Thank you, this is is a great resource

[xp677]

I've added a load more information and pictures to the wiki page.

When answering questions in this thread, if the question is one that we feel may appear frequently, or involves some really useful information which could be easily lost (connector part numbers, for example), would it be possible for those answering to update the wiki page instead, and point to that? This keeps all the useful information in one place.

It may be worth linking to the wiki page in the first post of this thread.

My aim is to hopefully be able to answer all the "how do I" questions before they are asked .

[Jack Bauer]

WiFi interface for the VCU on test.

[Jack Bauer]

WiFi files uploaded to Github. Will require a mod to the software to pump out the required serial string on Usart 3.

[xp677]

This is nice. Is the communication bi-directional? Can you send parameters to the VCU using the web interface?

[Jack Bauer]

Just one way for now.

[RE3Rotor]

What is it built on? My expertise focuses on web/UI so I don't mind lending a hand there.

[Dilbert]

What is it built on? My expertise focuses on web/UI so I don't mind lending a hand there.

Most of the work displaying data is done on the client-side using java script. The server side is an ESP8266, so as such doesn't have powerful frameworks available, it is mainly written in C/arduino wiring language.

You can review the source here:-
https://github.com/damienmaguire/Lexus- ... aster/WiFi

[Jack Bauer]

Made some good progress with the VCU today.

WiFi interface up and running.

Integrating with ISA CAN shunt.

New software on Github.

ISA shunt datasheet attached for those interested.

[mfox]

Great progres

[xp677]

Just a peek at what I'm working on to support this project:

This is a housing/insulator for the HV cables which enter through the port in the side of the inverter. It's sized for 50mm² cable, when it's done it will have slots for O-rings all round.



This is based on the design used by the gentleman who converted his BMW 330i a few years ago. It's a 3-piece design which sandwiches the cable lugs.

I'm also doing a second one for the converter - to allow us to access that without needing the OEM connector - it's not possible to connect this connector when we have cables plugged into the DC bus.

[Dilbert]

Looks great on all fronts, both the WiFi interface and cover. Quick question, to access the high voltage bus on the side on the inverter is there any trick to removing the black plastic cover, or does it just clip out?