I'm working on car with TFSI engine. 2.0 16v engine , 60-2 with camsyc(4 pulses, 3 can be filtered), variable cam ... and FSI injectors(spraying direct inside combustion camber at high pressure).
So problem is that engine has only 3-30bar(pressure depending on revs and how long do you crank and how long is engine turned of...) of pressure of fuel during cranking. Normal working pressure is 120bar.
Also engine has pressure sensor(0-5V) so i need to change req_fuel(fueltrim) depending on that voltage(pressure). But current scale is only 178% more, but i need a least 800% more.
Hello Damir,
Nice implementation on the direct injectors, to scale cranking pulse width a lot more use Anytrim in (crank_pw) mode this allows upto 697% scaling. Also a combination of Anytrims can produce a much higher percentage.
Required factor scaling from pressure alone: sqrt(120/3) = 6.32 (not taking fuel temp into account) should be quite doable. - DB
Help and details: http://vems.hu/vt/help/v3/v3_anytrim_control.html
.. Problem is that after cranking(so more than 400rpm) fuel pressure isn't 120 bar. It takes few seconds to reach 120 bar. So changing only crank pulses isn't enough. Better way is change scale of fueltrim.
And injectors request 80V for opening, but i solved that. Here is trace at wot(0.1bar of boost) at 1500rpm.
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