Bifuel software support

[mr_g]

As MWfire tried to explane, on PWM, AVR output to that mosfet is in high-Z state.. So, mosfet driver will see 62500Hz from OC0 output over that resistor (witch is 2K2 on v3.4)...

On ramp up time, AVR outputs low state to mosfet driver and override PWM...

On injector off time, AVR outputs high state to mosfet driver and also override PWM...

In this configuration, I use one bank for high-Z gasoline injectors (INJA-INJD), and another bank for low-Z LPG injectors on PWM (INJE-INJH)...

[GintsK]

Thanks for explanations!

What is plan about realizing 12V flyback at PWM time?

[mr_g]

We will put active flyback (4 flybacks actually for 4 PWM injectors) and 1 high voltage flyback I already have..

Will see how it goes when PCB for flybacks is ready...

[mr_g]

Active flyback...

http://www.vems.hu/wiki/index.php?page=MembersPage%2FGoranJurkovic%2FDaewooLaNOS%2FLPG

[MWfire]

I made one prototype for my car.
PCB
 
Assembled board(missing 2 zener diodes, i bought two too few)

This is slightly different vesion. It has an installed flyback.
Test soon.

[mr_g]

What are those diodes in series connected from Source to Drain?

I did it also on proto board...

[mr_g]

I have tried it, and it works perfect.... I still don't have those 15V zenner 5W, but I will put them today... Car is idling great at 1.05lmabda with no missfires... Before, it could idle nice above 0.80lambda...

I still have some missfires on 3krpm with low MAP numbers on 1.05, but on 1.00 works ok... Maybe the coil dwell time will fix this situation, alto I would like to make CDI to be sure...