Hi guys,
I'm also experimenting with ETB, in my setup I use a MC33866 H-Bridge and STM32F407VET6 Black.
I have a mechanical test setup with a 36-1 VR Trigger and a 1 Pulse CAM Trigger.
The ETB function works very well without triggers into the ECU (newest Rusefi firmware from Github), but when I simulate a running engine
i will go haywire when I pass around 3200-3700RPM. The ECU looses connection to Tunerstudio and Run and Comm indicators stops.
First I thought of noise from the ETB motor, but no, this even happends without the ETB motor connected. I traced it to : when I enable
"Throttle pedal Position Channel" in Tunerstudio the firmware goes haywire, even I did not configure any ETB outputs and no ETB connected.
I've made a short video of the issue, I hope one of you have an idea.
My coding skills is limited to Arduinos and old PIC's
Re: electronic throttle body control ETB
Posted: Mon Sep 30, 2019 1:57 pm
by NickZ
sharing a pin with something else?
Re: electronic throttle body control ETB
Posted: Mon Sep 30, 2019 2:07 pm
by AndreyB
do you have a 20x4 LCD to mount and read the message? what timezone are you in?
Re: electronic throttle body control ETB
Posted: Mon Sep 30, 2019 2:35 pm
by rene325
No shared pins.
I'm using PC1 as Throttle Pedal Position Channel, ETB Dir1 : PA15, ETB Dir2 : PC12, ETB Control : PD0
No errors in rusEFI console, which also stops communicating at the same RPM
No LCD connected, but I can connect one up, if that helps debugging.
I'm in CET timezone
Re: electronic throttle body control ETB
Posted: Mon Sep 30, 2019 4:16 pm
by kb1gtt
With out other stuff, can you open and close the ETB fully? I wonder if the higher amps at WOT are causing a ground to pull up and for the command bits to get lost as they might not generate enough voltage.
Re: electronic throttle body control ETB - performance issue?
Posted: Mon Sep 30, 2019 4:39 pm
by rene325
It is probably not any gnd problems, because it does not matter if the ETB is connected.
Without ETB current draw is 175mA, with ETB going from closed to WOT around 1A, at steady state 50% throttle, current draw is around 700mA
Did anyone try to rev and hold their engine at 4000 rpms without issues ?
Re: electronic throttle body control ETB - performance issue?
Posted: Thu Oct 03, 2019 12:41 pm
by AndreyB
Funny thing is that connectivity returns once RPM go down - firmware is not hanging, it's just very unhappy.
Thank you Rene for reporting this and the troubleshooting session!
Re: electronic throttle body control ETB - performance issue?
Posted: Thu Oct 03, 2019 1:53 pm
by puff
is it at all related to etb?
Re: electronic throttle body control ETB - performance issue?
Posted: Thu Oct 03, 2019 4:02 pm
by AndreyB
probably not related at all. just highest PWM frequency. same could happen with idle solenoid or vvt solenoid
Re: electronic throttle body control ETB - performance issue?
Posted: Thu Oct 03, 2019 8:52 pm
by puff
not my case?
(I seem to have similar disconnects, but caused by noisy cps signal?)
how did rusefi_no_asserts help rene325?
Re: electronic throttle body control ETB - performance issue?
Posted: Fri Oct 04, 2019 1:19 am
by Abricos
I have MRE ... And no problems ...
Re: ETB or 36/1 performance issue?
Posted: Sat Oct 12, 2019 8:48 am
by NickZ
Ive just been testing my new board and using 36-1 and electronic throttle body upto 6000 rpm with no problems, works great. the only thing i find is trying to get the ETB to follow the pedal, I can only use about 50% of the pedal and it will shoot upto 100% throttle body.
Re: ETB or 36/1 performance issue?
Posted: Sat Oct 12, 2019 11:32 am
by Old Grey
Not that I know anything about it, but does it have a variable ratio activation table, ie, 0-50% on the pedal is 1:1, but 50-100 is 4:1. I know it was common in Supercars, but they did it mechanically with changing rate pulleys.
I don't even know about the sensors or actuators, but is there a mech ratio in the travel of either. ie, is the digital valve reported in the ECU linear with travel.
Re: ETB or 36/1 performance issue?
Posted: Thu Oct 17, 2019 4:11 am
by AndreyB
Let's focus this topic on the 36/1 performance issue, not on ETB settings - ETB settings is a different not trivial subject.
I just testet with latest precompiled binary.
I still have communication loss at 3500 rpms, when pedal sensor channel is active.
It looks like you are confident that this is related to ETB while our theory was that this only relates to trigger shape and trigger type, regardless of ETB.
Can you please change from 36/1 trigger to "one tooth" trigger and use self-stimulation 5000 RPM? I wonder if things would change if much simpler trigger shape is used.
Re: ETB or 36/1 performance issue?
Posted: Mon Oct 21, 2019 9:04 pm
by NickZ
I believe rene325 problem is hardware related, mine is running fine 36-1 all the way to 6000 rpm. it will be a noise issue with the hardware.
Re: ETB or 36/1 performance issue?
Posted: Mon Oct 21, 2019 9:45 pm
by rene325
I can't justfy it as a noise problem. on the oscilloscope I have a super clean signal from the max9926. All problems disappear when disabling pedal sensor channel. Then it easily go to 9000 rpm. To test noise sensivity I did run it with 4 injectors and 4 coils connected om my workbench ,
No change, even with All close to the board (2-3 cm)
I Will test with one pulse like Andrey suggested
and report back
Re: ETB or 36/1 performance issue?
Posted: Mon Oct 21, 2019 10:11 pm
by Abricos
Pedal ...
Do you have chance chenget potenciometro ? And how many oms your potentiometer ???
All problems disappear when disabling pedal sensor channel. Then it easily go to 9000 rpm.
Please post your CurrentTune.msq file
Please try increasing your ETB control period to 100ms and lowering your ETB PWM frequency to 10Hz.
I am still wondering if that's some kind of performance related issue, so I am trying to lower the CPU usage associated with ETB by having longer PID cycle and longer PWM cycle.
If it the same behavior on "debug" and "no_assert" versions of the firmware? You are using stm32f407 right?
Re: ETB or 36/1 performance issue?
Posted: Tue Oct 22, 2019 5:48 am
by NickZ
im currently running 300hz and 50ms
Screen Shot 2019-10-22 at 4.47.21 pm.png (125.73 KiB) Viewed 25112 times
and running the standard firmware version.
A little video.
Re: ETB or 36/1 performance issue?
Posted: Wed Oct 23, 2019 8:26 am
by rene325
Yes I'm using STM32F407VGT6 as a processor.
This i what I have tested :
36-1 Trigger Wheel - Standard firmware
PWM Frequency : 500Hz
Control period : 10ms max RPM before loosing comms : 3370
Control period: 100ms max RPM before loosing comms : 3650
Control period: 1000ms max RPM before loosing comms : 4650
PWM Frequency : 10Hz
Control period : 10ms max RPM before loosing comms : 3650
Control period : 100ms max RPM before loosing comms : 3910
Control period : 1000ms max RPM before loosing comms : 5390
36-1 Trigger Wheel - No Asserts firmware
PWM Frequency : 500Hz
Control period : 10ms max RPM before loosing comms : 7000
Control period: 100ms max RPM before loosing comms : 7600
Control period: 1000ms max RPM before loosing comms : 8800
PWM Frequency : 10Hz
Control period : 10ms max RPM before loosing comms : 7075
Control period : 100ms max RPM before loosing comms : 8200
Control period : 1000ms max RPM before loosing comms : 9200
I certainly seems like a performance issue.
All test are made with a real Trigger Wheel and VR sensor, with ETB disabled, all firmware versions easily runs to 16000 rpm
CurrentTune.msq included
NickZ could you send me your tune to test ?
Re: ETB or 36/1 performance issue?
Posted: Wed Oct 23, 2019 11:35 am
by NickZ
i could send you my tune but my hardware is way different to yours and none of my pinout will match. My whole brain board is the ecu all custom.
[The extension msq has been deactivated and can no longer be displayed.]
Re: ETB or 36/1 performance issue?
Posted: Wed Oct 23, 2019 11:56 am
by NickZ
I see im using a different H bridge, im using a VNH2sp30 where I have on or off for directions and a PWM signal, your PWM is coming from the Direction outputs only. from what i can see from your video.
Control period: 100ms max RPM before loosing comms : 3650
Control period: 1000ms max RPM before loosing comms : 4650
...
Control period : 100ms max RPM before loosing comms : 3910
Control period : 1000ms max RPM before loosing comms : 5390
...
with ETB disabled, all firmware versions easily runs to 16000 rpm
Thank you for quality data! I cannot explain this but your data is definitely showing that ETB is somehow blocking CPU for too long to cause problem.
I hope to look into this in a few days / maybe weeks Because life. But the data is very convincing and valuable, really appreciate it!
Thanks NickZ for the CurrentTune.msq
My H-Bridge are wired so it can use both modes.
I had a bit of an ??? experience. I loaded Nick's tune and rewired my brainboard.
Funny thing is, it now without any problems runs 8500 RPM's with standard Firmware and running ETB.
I guess some configurations can upset the firmware
Funny thing is, it now without any problems runs 8500 RPM's with standard Firmware and running ETB.
is it sequential VS batched injection by any chance? Or can you do the analysis of config differences?
Re: ETB or 36/1 performance issue?
Posted: Sat Oct 26, 2019 11:16 am
by rene325
NickZ are running wasted spark and batch injection. I tried to change to sequential injection and individual coils. I realized it is not possible with 36-1 as crank and 1 pulse on cam. I used cam signal as primary and crank signal as secondary, no ignition and no injection.
I selected 1/60-2 instead and i got ignition and injection, but of course only at half the speed.
If I use 36-1 without Cam I got ignition and injection, but the phase of the engine is random.
Trying different settings, I also got this setup to loose comms at 3500rpms. If I go to Base Engine ->Trigger ->Print verbose sync details >true
Re: ETB or 36/1 performance issue?
Posted: Sat Oct 26, 2019 11:47 am
by rene325
And the difference between my and NickZ's pinout:
My Pinout NickZ Pinout
MAP PA0 PA0
CLT PC2 PC2
IAT PA4 PC1
VBatt PC4 PC4
TPS PA3 PA2
E-Throttle PC1 PC3
CRK PA5 PC6
CAM PC6