Vehicle speed vs. CAN

[derUltraTT]

I am useing V3 now for a longer time and also for a longer time i have some strange deviations/observations regarding vehicle speed, which i want to clarifiy now.
My setup:
I have a speed sensor on front axis and a CAN Signal from ABS modul from Rear axis (1:1 mapping on CAN.

I want to use the ABS signal from CAN as main signal.
First thing, which i don’t understand is, why do i need to devide the CAN signal by 6? I am 100% sure it is 1:1 mapped on CAN since i have the CAN dbc file and i also use this signal on my ADU and there it works with multiplier 1. What is the EMU doing there and is 6 even the correct divider bcause i think i have some small deviations EMU read vs ADU read?

Another question…in the emu balck CAN stream vehicle speed. What does it output? The sensor value or the source selected in vehicle speed?

I am a bit confused. There is defenitly soemthing strange in the SW which leads to small deviations in my setup.
AudiTT_AJQ_rev98_ASE.emub3 (71.7 KB)

[ELMEPRO]

Somtimes i see in logs inifite wheel speed, little bit stronge

[derUltraTT]

I also have this on the sensor value.

[Jadzwin_ECUMASTER]

I’ve checked it and it works as designed.

The speed is in 1/16 of km/h

@derUltraTT

ant to use the ABS signal from CAN as main signal.
First thing, which i don’t understand is, why do i need to devide the CAN signal by 6? I am 100% sure it is 1:1 mapped on CAN since i have the CAN dbc file and i also use this signal on my ADU and there it works with multiplier 1. What is the EMU doing there and is 6 even the correct divider bcause i think i have some small deviations EMU read vs ADU read?

Another question…in the emu balck CAN stream vehicle speed. What does it output? The sensor value or the source selected in vehicle speed?

I am a bit confused. There is defenitly soemthin

[Jadzwin_ECUMASTER]

Do you have a log file with such situation ? I’m very curious what vss value cause the inf. floating point number…

[ELMEPRO]

inf-speed-nr3.emublog3 (139.8 KB)
inf-speed-nr2.emublog3 (93.3 KB)
inf-speed-nr1.emublog3 (151.5 KB)
wh speed is from e90 can bus base stream

[derUltraTT]

Ah thank u…i was missing this in the help section. Was just looking in the help for speed settings. Maybe u can add this there too.

So for my case…i have on CAN a resolution of 1 bit per 0,01km/h, means i must not divide it by 6 but by 6,25 (=multiplier of 16 and divider of 100).
That explains my small deviations.

[Jadzwin_ECUMASTER]

yes exactly as you write. I add this information for Wheel speed section too.,

[Jadzwin_ECUMASTER]

I cant see the inf on the graph log.

I think the high speed on the log is caused by some error flags from the e90 abs.