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SCG-ECU-X - let's start project

Posted: Wed Jul 10, 2019 9:21 pm
by dvjcodec
I start project ECU who can give posibility to run Speeduino and rusEFI firmware. Teensy 3.5 and STM32F407 can be used with this board.

Work in progress. Here is sample schematic.

Re: SCG-ECU-X - let's start project

Posted: Wed Jul 10, 2019 9:28 pm
by russian
What EAD are you using? Do you plan to publish source files or only gerbers/schematics?

Re: SCG-ECU-X - let's start project

Posted: Thu Jul 11, 2019 2:25 am
by kb1gtt
My eyeballs think this is eagle.

Re: SCG-ECU-X - let's start project

Posted: Thu Jul 11, 2019 6:21 am
by dvjcodec
Use Eagle. Will publish full source.

Re: SCG-ECU-X - let's start project

Posted: Thu Jul 11, 2019 7:47 am
by kb1gtt
What are your goals? For example, what does this provide that is not already provided in something like the Frankenso? I ask in part because there are perhaps other hardware efforts which do not exist yet, and I wonder if you plan to take on such a hardware effort, perhaps we can entice you to spin a different bit of hardware.

Re: SCG-ECU-X - let's start project

Posted: Fri Jul 12, 2019 7:15 am
by dvjcodec
I would like to design new board, with new electronic components (less small electronic, more hybrid chips), compatible with AEC-Q automotive standard and designed for refubrished enclosure.

Re: SCG-ECU-X - let's start project

Posted: Fri Jul 12, 2019 9:29 am
by kb1gtt
Some suggested design paramerters are found here
https://rusefi.com/wiki/index.php?title=Manual:Hardware

Also MRE is much closer to what you explain. Of course the MCU is the key place that is more difficult to get automotive quality. The STM32 and AVR are not automotive grade, but are typically considered good enough for our off road stuff.

With rusEFI, we use ChibiOS which helps software development allot. ChibiOS does have support for a couple automotive grade chips. If you have software skills, porting to one of those chips would be an effort of interest.

We are currently developing Micro rusEFI which is also known as MRE. This is a smaller-ish ECU which is intended to be more like you say. It uses special chips instead of the more generic components used on Frankenso. This includes the TLE8888 which has reduced the size greatly.

Re: SCG-ECU-X - let's start project

Posted: Fri Jul 12, 2019 9:53 am
by russian
dvjcodec wrote:
Fri Jul 12, 2019 7:15 am
more hybrid chips
TLE8888 seems to be the god of hybrid chips?

More about MRE at https://github.com/rusefi/hw_microRusEfi there is link to forum thread there as well.

Re: SCG-ECU-X - let's start project

Posted: Fri Jul 12, 2019 10:02 am
by kb1gtt
Also we are making progress on direct injection board based ECU. Feel free to check out our progress on the 33816 or PT2000.

Re: SCG-ECU-X - let's start project

Posted: Fri Jul 12, 2019 11:02 am
by dvjcodec
For injectors, I was choose TLE9104 from Infineon. Target application is driving resistive/inductive loads (Solenoids, Injectors, Valves, Relays), so I think is a good for injectors. I would like to test this chip, because in future want to put in my other project for 722.6 transmission (pcb in attachment) and replace few DPAK mosfets. Do not have much experience with SPI controll, use 4 direct inputs to test.
https://www.infineon.com/cms/en/product ... tle9104sh/

Re: SCG-ECU-X - let's start project

Posted: Fri Jul 12, 2019 6:22 pm
by kb1gtt
Flyback diode injector drivers are slow and less accurate. The clamping style injector drivers are faster and more precise. The faster means you can get closer to the 100% duty cycle before you have problems.

Re: SCG-ECU-X - let's start project

Posted: Tue Jul 16, 2019 2:10 pm
by dvjcodec
OK, thnx for info.
What about external LCD? I wonder to add 2 differential RS485 chips for 4 LCD's lines to keep clear data transfer over long wire.

Re: SCG-ECU-X - let's start project

Posted: Wed Jul 17, 2019 6:06 pm
by kb1gtt
CAN bus is very similar to RS485, and it's specifically hardened for automotive uses. I would suggest using CAN instead of RS485. I know the STM32 has native CAN hardware, and that rusEFI has done CAN communications. See Frankenso for the interfacing chip. Basically the STM32 does a TTL bits, while the Frankenso chip converts to RS485 style bits.

Re: SCG-ECU-X - let's start project

Posted: Wed Jul 17, 2019 7:28 pm
by dvjcodec
Schematic