MembersPage/RobertNagy (2015-04-02 09:36:53)

VEMS Round with Motronic 7.1

VEMS Round using the following input:

- WBO2

- EGT

- Analog 1 --> 10 bar oil pressure sensor

- Analog 2 --> 400kPa VEMS Map sensor

Outputs:

- PWM0 -> reference RPM drive warning led for shiftlight

- PWM4 -> reference RPM drive "shift-now" led for shiftlight

Both PWMs should reference RPM and start sending PWM signal to the respective leds when reached the configured RPM.

Either needs a new target method for both PWM outputs or a hackish way is to configure an unreachable EGT or lambda target.

Sounds like a crap solution.

0V -> 10 AFR

5V -> 20 AFR

To calculate the factor, we first must remove the offset. We do this by subtracting the value at 0v from the value at 5v.

20-10=10

This number is the value at 5v without the offset applied. To get the value per voltage we just divide this by 5 (volts).

10/5=2

Our factor is 2 and the offset (value at 0v) is 10.

Now we just apply the factor for the particular RAM variable that we are working with in ME7.

uushk_w voltage factor is 0.004883, so we multiply this by the voltage to AFR factor that we calculated for our new input.

0.004883*2=0.009766

ME7Logger applies a negative offset, so in order to use a positive offset we just need to flip the sign.

The values that we have been working with are AFR, therefore to convert our input to AFR:

Factor : 0.009766

Offset : -10

- RPM input is coming from the Motronic RPM signal (instrument cluster)

Q: Can this even be configured or do we need a crank signal?! If that's the case the documentation (Help) should be change to state something other than "RPM Signal".

A: Yes RPM signal from dash is fully supported, [more info in VT help Rpm Input], example for 4cyl: rpm_toothcount=02 for a 4 cyl 2 events per rotation